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One of the most important aspects of any display you can understand is the panel technology being used. Specifications alone won’t give you the full picture of a displays performance, and we all know that manufacturers can exaggerate specs on paper to suit their marketing. With an understanding of the panel technology being used you will get a feel for the overall performance characteristics of the display and how it should perform in real terms. Our extensive panel search database helps you identify the panel technology (and manufacturer and part number where known) of many screens in the market. This article which follows will help you understand what the different panel technologies can offer you. A lot of manufacturers now list the panel technology as well in their specs, something which wasn’t included a in the past.

Here we will look at the main panel technology types, and the many different versions of each you might see in the market.

TN Film (Twisted Nematic + Film)

TN Film panels are the mostly widely used in the desktop display market and have been for many years since LCD monitors became mainstream. Smaller sized screens (15″, 17″ and 19″) are almost exclusively limited to this technology in fact and it has also extended into larger screen sizes over the last 7 years or so, now being a popular choice in the 20 – 28″ bracket as well. The TN Film panels are made by many different manufacturers, with the big names all having a share in the market (Samsung, LG.Display, AU Optronics) and being backed up by the other companies including most notably Innolux and Chunghwa Picture Tubes (CPT). You may see different generations of TN Film being discussed, but over the years the performance characteristics have remained similar overall.


Close up macro of the sub-pixels in the TN screen in the DGM L- 2262Wd monitor.
Image courtesy of


TN Film has always been so widely used because it is comparatively cheap to produce panels based on this technology. As such, manufacturers have been able to keep costs of their displays down by using these panels. This is also the primary reason for the technology to be introduced into the larger screen sizes, where the production costs allow manufacturers to drive down retail costs for their screens and compete for new end-users.
The other main reason for using TN Film is that it is fundamentally a responsive technology in terms of pixel latency, something which has always been a key consideration for LCD buyers. It has long been the choice for gaming screens and response times have long been, and still are today, the lowest out of all the technologies overall. Response times typically reach a limit of around 5ms at the ISO quoted black > white > black transition, and as low as 1ms across grey to grey transitions where Response Time Compensation (overdrive) is used. TN Film has also been incorporated into true 120Hz+ refresh rate desktop displays, pairing low response times with high refresh rates for even better moving picture and gaming experiences, improved frame rates and adding 3D stereoscopic content support. Modern 120Hz+ refresh rate screens normally also support NVIDIA 3D Vision 2 and their LightBoost system which brings about another advantage for gaming. You can use the LightBoost strobed backlight system in 2D gaming to greatly reduce the perceived motion blur which is a significant benefit. Some screens even include a native blur reduction mode instead of having to rely on LightBoost ‘hacks’, providing better support for strobing backlights and improving gaming experiences when it comes to perceived motion blur. As a result, TN Film is still the choice for gamer screens because of the low response times and 120Hz+ refresh rate support.


The main problem with TN Film technology is that viewing angles are pretty restrictive, especially vertically, and this is evident by a characteristic severe darkening of the image if you look at the screen from below. Contrast and colour tone shifts can be evident with even a slight movement off-centre, and this is perhaps the main drawback in modern TN Film panels. Some TN Film panels are better than others and there have been improvements over the years to some degree, but they are still far more restrictive with fields of view than other panel technologies. The commonly quoted 170/160 viewing angles are an unfair indication of the actual real-life performance really, especially when you consider the vertical contrast shifts. Where viewing angles are quoted by a manufacturer as 160/160 or 170/160 that is a clear sign that the panel technology will be TN Film incidentally.


Movie playback is often hampered by ‘noise’ and artifacts, especially where overdrive is used. Black depth was traditionally quite poor on TN Film matrices due to the crystal alignment, however, in recent years, black depth has improved somewhat and is generally very  good on modern screens, often surpassing IPS based screens and able to commonly reach contrast ratios of ~1000:1. TN Film is normally only a true 6-bit colour panel technology, but is able to offer a 16.7 million colour depth thanks to dithering and Frame Rate Control methods (6-bit + FRC). Some true 8-bit panels have become available in recent years (2014 onwards) but given the decent implementation of FRC on other 6-bit+FRC panels, the real-life difference is not something to concern yourself with too much.


Most TN Film panels are produced with a 1920 x 1080 resolution, although some larger sizes have become available with higher resolutions. A new generation of Quad HD 2560 x 1440 27″ TN Film panels emerged in 2014. We’ve also seen the introduction of 28″ Ultra HD 3840 x 2160 resolution TN Film panels become available, and adopted in many of the lower cost “4k” models in the market. Where used, the Anti-Glare (AG) coating used on most TN Film panels is moderately grainy – not as grainy as some older IPS panel coatings, but not as light as modern IPS, VA or equivalents. Also at the time of writing there are no ultra-wide (21:9 aspect ratio) or curved format TN Film panels in production.



TN Film Summary Typical Modern Spec / Features
  • Produced by most manufacturers
  • Dominate smaller screen market almost exclusively (15 – 19″)
  • Also available in larger sizes up to 28″ max
  • Low cost to produce, low retail costs for screens
  • Higher resolutions emerging since 2014
  • Commonly used for gaming screens
  • No ultra-wide 21:9 aspect ratio or curved format panels in production currently
  • 1920 x 1080 resolution very common
  • Some 2560 x 1440 Quad HD 27″ panels now available
  • Some 3840 x 2160 Ultra HD 28″ panels now available
  • 1 – 2ms G2G response time
  • 1000:1 contrast ratio (realistic)
  • 170/160 viewing angles (unrealistic in vertical field)
  • 16.7m colour depth through 6-bit+FRC panels
  • Moderately grainy AG coating
  • 120Hz+ refresh rate support from some

  • Responsive especially since introduction of overdrive – key choice for gamer screens
  • Can natively support 120Hz+ refresh rates
  • 120Hz+ screens often feature LightBoost backlight systems for improved motion blur

  • Most restrictive viewing angles, especially in vertical plane
  • Not great for colour critical work due to viewing angles primarily
  • Movie noise problematic, especially where overdrive used
  • Moderately grainy AG coating common


Vertical Alignment (VA)

VA technology was first developed by Fujitsu in 1996. However the limited viewing angles were its main disadvantage, and so further investment focused on addressing this problem. It was eventually solved by dividing each pixel into domains which worked synchronously. This lead the birth of the following technologies:

Multi-domain Vertical Alignment (MVA)

Sub-pixels in the MVA screen in the Samsung LE32S86BD TV. 
Image courtesy of

MVA technology, was later developed by Fujitsu in 1998 as a compromise between TN Film and IPS technologies. On the one hand, MVA provided a full response time of 25 milliseconds (that was impossible at the time with IPS, and not easily achievable with TN), and on the other hand, MVA matrices had wide viewing angles of 160 – 170 degrees, and thus could better compete with IPS in that parameter. The viewing angles were also good in the vertical field (an area where TN panels suffer a great deal) as well as the horizontal field. MVA technology also provided high contrast ratios and good black depth, which IPS and TN Film couldn’t quite meet at the time.

In MVA panels, the crystals in the domains are oriented differently, so if one domain lets light pass through, the neighboring domain will have the crystals at an angle and will shutter the light (of course, save for the display of white color, in which case all the crystals are placed almost in parallel to the matrix plane).

As MVA developed over the years the problem became that the response times were not as good as TN film panels and was very difficult to improve. Sadly, the response time grows dramatically when there’s a smaller difference between the pixel’s initial and final states (i.e. the more common grey to grey transitions). Thus, such matrices were unsuitable for dynamic games. With the introduction of RTC and overdrive technologies, the manufacturers launched a new breed of MVA discussed in the following sections.

Premium MVA (P-MVA) and Super MVA (S-MVA)


Premium MVA (P-MVA) panels were produced by AU Optronics, and Super MVA (S-MVA) panels by Chi Mei Optoelectronics (now Innolux) and Fujitsu from 1998 onwards. AU Optronics have since entered a more recent generation referred to as AMVA (see the next section) and S-MVA panels are rarely used in mainstream monitors nowadays. When they were launched they were able to offer improved response times across grey to grey (G2G) transitions which is a great improvement in the MVA market. While responsiveness was still not as fast as TN Film panels using similar RTC technologies, the improvement was obvious and quite drastic. This was really the first time that MVA matrices could be considered for gaming, and arrived at the time when overdrive was being more widely implemented in the market.

While some improvements have been made, the color-reproduction properties of these modern MVA technologies can still be problematic in some situations. Such panels give you vivid and bright colors, but due to the peculiarities of the domain technology many subtle color tones (dark tones often) are lost when you are looking at the screen strictly perpendicularly. When you deflect your line of sight just a little, the colors are all there again. This is a characteristic “VA panel contrast shift” (sometimes referred to as ‘black crush’ due to the loss of detail in dark colours) and some users pick up on this and might find it distracting. Thus, MVA matrices are somewhere between IPS and TN technologies as concerns color rendering and viewing angles. On the one hand, they are better than TN matrices in this respect, but on the other hand the above-described shortcoming prevents them from challenging IPS matrices, especially for colour critical work.

Traditionally MVA panels offered 8-Bit colour depth (a true 16.7 million colours) which is still common place today. We have yet to see any new breed of 10-bit capable MVA panel even using Frame Rate Control (8-bit + FRC). Black depth is a strong point of these P-MVA /S-MVA panels, being able to produce good static contrast ratios as a result of around 1000 – 1200:1 in practice. Certainly surpassing IPS matrices of the time as well as most TN Film panels. This has improved since with more recent AMVA panels to 3000 – 5000:1 (see next section).

MVA panels also offer some comparatively good movie playback with noise and artifacts quite low compared with other technologies. The application of overdrive doesn’t help in this area, but MVA panels are pretty much the only ones which haven’t suffered greatly in movie playback as a result. Many of the MVA panels are still pretty good in this area, sadly something which overdriven TN Film, IPS and PVA panels can’t offer. While CMO are still manufacturing some S-MVA matrices, AU Optronics no longer produce P-MVA panels and instead produce their newer generation of MVA, called AMVA (see below).

Further reading:


Advanced MVA (AMVA)

Older generation AMVA with 4 domains

Newer generation AMVA+ with 8 domains

AU Optronics have more recently (around 2005) been working on their latest generation of MVA panel technology, termed ‘Advanced Multi Domain Vertical Alignment’ (AMVA). This is still produced today although a lot of their focus has moved to the similarly named, and not to be confused AHVA (Advanced Hyper Viewing Angle, IPS-type) technology. Compared with older MVA generations, AMVA is designed to offer improved performance including reduced colour washout, and the aim to conquer the significant problem of colour distortion with traditional wide viewing angle technology. This technology creates more domains than conventional multi-domain vertical alignment (MVA) LCD’s and reduces the variation of transmittance in oblique angles. It helps improve colour washout and provides better image quality in oblique angles than conventional VA LCD’s. Also, it has been widely recognized worldwide that AMVA technology is one of the few ways to provide optimized image quality through multiple domains.


AMVA provides an extra-high contrast ratio of greater than 1200:1, reaching 5000:1 in manufacturer specs at the time of writing for desktop monitor panels by optimized colour-resist implementation and a new pixel design and combining the panels with W-LED backlighting units. In practice the contrast ratio is typically nearer to 3000:1 from what we’ve seen, but still far beyond IPS and TN Film matrices. The result is a more comfortable viewing experience for the consumer, even on dimmer images. This is one of the main improvements with modern AMVA panels certainly, and remains way above what competing panel technologies can offer.

AMVA still has some limitations however in practice, still suffering from the off-centre contrast shift you see from VA matrices. Viewing angles are therefore not as wide as IPS technology and the technology is often dismissed for colour critical work as a result. As well as this off-centre contrast shift, the wide viewing angles often show more colour and contrast shift than competing IPS-type panels, although some recent AMVA panel generations have shown improvements here (see BenQ GW2760HS for instance with new “Color Shift-free” technology). Responsiveness is better than older MVA offerings certainly, but remains behind TN Film and IPS/PLS in practice. The Anti-Glare (AG) coating used on most panels is light, and sometimes even appears “semi glossy” and so does not produce a grainy image.

At the time of writing AMVA panels are typically offered with an HD 1920 x 1080 resolution, although some are available in sizes up to 32″ maximum, at a resolution of 2560 x 1440 (Quad HD). At this time there are no native 120Hz+ AMVA panels from AU Optronics in production although at one point AUO were looking into them. Also at the time of writing there are no ultra wide (21:9 aspect ratio) or curved format MVA-type panels in production.

 Note: There is no AMVA4 generation.

AUO developed a series of vertical-alignment (VA) technologies over the years. This is specifically for the TV market although a lot of the changes experienced through these generations applies to monitor panels as well over the years. Most recently, the company developed its AMVA5 technology not only to improve the contrast ratio, but also to enable a liquid crystal transmission improvement of 30% compared to AMVA1 in 2005. This was accomplished by effectively improving the LC disclination line using newly developed polymer-stabilized vertical-alignment (PSA) technology. PSA is a process used to improve cell transmittance, helping to improve brightness, contrast ratio and liquid crystal switching speeds.


The original P-MVA generation had a four-domain orientation. The key concept in AUO’s AMVA2 in 2005 was for eight-domain VA, using a capacitive coupling method with an ART transistor that can provide improved colour-washout performance. AMVA2 is an improved version of AMVA in terms of contrast ratio. PSA was applied to AMVA3 to improve the transmittance for an eight-domain VA, and AMVA5 provides further improvements in contrast ratio and transmittance via storage-capacitor modification and colour filter material optimization.



Sharp’s MVA

We have included this technology in this section as it is a modern technology still produced by Sharp as opposed to the older generations of MVA discussed above. Sharp are not a major panel manufacturer in the desktop space, but during 2013 began to invest in new and interesting panels using their MVA technology. Of note is their 23.5″ sized MVA panel which was used in the Eizo Foris FG2421 display. This is the first MVA panel to offer a native 120Hz refresh rate, making it an attractive option for gamers. Response times had been boosted significantly on the most part, bringing this MVA technology in line with modern IPS-type panels when it comes to pixel latency. The 120Hz support finally allowed for improved frame rates and motion smoothness from VA technology, helping to rival the wide range of 120Hz+ TN Film panels on the market.

Of particular note also are the excellent contrast ratios of this technology, reaching up to an excellent 5000:1 in practice, not just on paper. Viewing angles are certainly better than TN Film and so overall these MVA panels can offer an attractive all-round option for gaming, without some of the draw-backs of the TN Film panels. Viewing angles are not as wide as IPS panel types and there is still some noticeable gamma shift at wider angles, and the characteristic VA off-centre contrast shift still exists.


MVA Generations Summary

MVA Summary Typical Modern Spec / Features
  • Early MVA panels designed to improve on TN Film. Offered improved viewing angles but very slow response times
  • Later P-MVA and S-MVA panels offered improved response times. Also improved contrast ratios to 1000 – 1200:1 typically
  • Modern AMVA panels from AU Optronics. Improved response times further and contrast ratios now 3000 – 5000:1
  • Some MVA development of note from Sharp also with 120Hz support also offered
  • AMVA most common VA type in the market, available up to 32″ in size, with Quad HD resolution
  • No ultra-wide (21:9 aspect ratio) or curved panels currently produced
  • 1920 x 1080 resolution most common
  • Some 2560 x 1440 resolution in larger sizes (32″)
  • 5 – 6ms G2G response time (in practice mostly much slower)
  • 5000:1 contrast ratio (figures over 3000:1 common and realistic)
  • 178/178 viewing angles (somewhat unrealistic considering contrast shifts and off-centre contrast issue)
  • 60Hz refresh rate generally
  • Some 120Hz support available
  • 16.7m colour depth through 8-bit panels
  • Light / semi-glossy AG coating used




  • Contrast ratios very high with >3000:1 common in practice
  • Response times adequate for most users and vastly improved over older generations of MVA
  • 8-bit colour depth
  • Some non- AUO manufactured versions now support 120Hz refresh rate
  • Some non- AUO manufactured versions paired with blur reduction backlights

  • Response time still normally slow compared with TN Film and IPS offerings.
  • Off-centre contrast shift inherent to all MVA panel generations. Not ideal for colour critical work
  • Viewing angles not as wide as IPS/PLS. Some improvements in very recent generations
  • No current 10-bit panels


Patterned Vertical Alignment (PVA)

Sub-pixels in the PVA screen in the Samsung UE40D7000 screen. Image courtesy of

PVA was developed by Samsung as an alternative to MVA in the late 1990’s. The parameters and the development methods for PVA and MVA are so different that PVA can be truly regarded as an independent technology, although it is still a ‘Vertical Alignment’ technology type and has many similar characteristics. PVA is a Samsung only technology.

The liquid crystals in a PVA matrix have the same structure as in a MVA matrix – domains with varying orientation of the crystals allow keeping the same color, almost irrespective of the user’s line of sight and viewing angle. Viewing angles are not perfect though, as like with MVA matrices when you are looking straight at the screen, the matrix “loses” some shades, which return after you deflect your line of sight from the perpendicular a little. This ‘off-centre’ contrast shift, or ‘black crush’ as it is sometimes called is the reason why some colour enthusiasts prefer IPS-type displays. The overall viewing angles are also not as wide as IPS-type panels, showing more obvious colour and contrast shifts as you change your line or sight.

There was the same problem with traditional PVA matrices as with MVA offerings – their response time grew considerably when there’s a smaller difference between the initial and final states of the pixel. Again, PVA panels were not nearly as responsive as TN Film panels. With the introduction of MagicSpeed (Samsung’s overdrive / RTC) with later generations (see below), response times have been greatly improved and are comparable to MVA panels in this regard on similarly spec-ed panels. They still remain behind TN Film panels in gaming use, but the overdrive really has helped improve in this area. There are no PVA panels supporting native 120Hz+ refresh rates and Samsung have no plans to produce any at this time. In fact Samsung’s investment in PVA seems to have been cut back significantly in favour of their IPS-like PLS technology.

The contrast ratio of PVA matrices is a strong point, as it is with MVA. Older PVA panels offered contrast ratios of 1000 – 1200:1 typically, but remained true to their spec in many cases. As such at the time of their main production they were better than TN Film, IPS and even MVA in this regard.  Movie playback is perhaps one area which is a weak point for PVA, especially on Samsung’s overdriven panels. Noise and artifacts are common unfortunately and the panels lose out to MVA in this regard. Most PVA panels were true 8-bit modules, although some generations (see below) began to use 6-bit+FRC instead. There are no 10-bit supporting PVA panels available, either native 10-bit or 8-bit+FRC. Panel coating is generally light on PVA panels, quite similar to a lot of MVA panels.

Super Patterned Vertical Alignment (S-PVA)

The introduction of overdrive to PVA panels lead to the next generation of Super Patterned Vertical Alignment (S-PVA) technology in 2004. Like P-MVA panels were to MVA, these are really just an extension of the existing PVA technology, but with the MagicSpeed (overdrive) technology, they have managed to make them more suitable for gaming than the older panels. One other difference is that the liquid crystal cell structure is a boomerang shape, splitting each sub pixel into two different sections with each aligned in opposite directions. This is said to help improve viewing angles and colour reproduction when viewed from the side. Limitations still exist with S-PVA and they don’t offer as wide viewing angles as IPS-type panels, and still suffer from the off-centre contrast shift we’ve described. Most S-PVA panels offered a true 8-bit colour depth, but some did feature Frame Rate Control (FRC) to boost a 6-bit panel (6-bit+FRC).

S-PVA Pixel Structure

Full brightness                                                    Low brightness

Close up inspection of the pixels making up an S-PVA matrix reveals the above. The dual sub-pixels consist of two zones, A and B, with one being turned on only at high brightness. So, the first picture shows red sub-pixels of roughly rectangular shape while the second picture shows two small pieces that represent one zone of each sub-pixel, the second zone being completely turned off.

It is this two-zone structure that differentiates S-PVA from older PVA matrixes which used to have a monolithic sub-pixel divided into four domains. An S-PVA matrix has two zones with four domains in each, for a total of eight domains per each sub-pixel. This helps fight the gamma shift effect which occurs when not only the contrast ratio but also the gamma (i.e. the correlation between the video signal sent to the monitor and the resulting screen brightness) changes when the screen is viewed from a side. The pixel zones of S-PVA matrixes have such shape, position and voltage (in the most expensive matrixes that are installed into some TV-sets, the two zones of one sub-pixel can even be controlled independently) as to mutually compensate the gamma shift effect for each other. Unfortunately, the gamma shift effect is not absolutely eliminated even in S-PVA matrixes. Besides, these matrixes have one more difference from PVA. Their viewing angles are asymmetric: the gamma shift is bigger from one side.

Images and some text courtesy of X-bit Labs

cPVA (definition uncertain)

In late 2009 Samsung started to produce their latest generation of so called “cPVA” panels. These new panels featured a simpler sub-pixel structure in comparison with S-PVA, but allowed Samsung to produce the panels at a lower cost, and drive down the retail cost of their new screens. It’s unclear what the “c” stands for. This is a similar approach to e-IPS which we discuss a little later on.

In practice, cPVA do not look any worse than S-PVA panels and in fact offer even better contrast ratios in early cPVA panel tests. Other performance characteristics including the off-centre contrast shift remained the same as S-PVA panels. Some cPVA panels are in fact using Frame Rate Control to produce their 16.7m colour depth (6-bit+FRC) as opposed to true 8-bit panels. See this news piece for more information about these 6-bit + AFRC cPVA panels.

cPVA Pixel Structure

Full brightness                                                    Low brightness

If you refer to the pixel structure in the S-PVA section above you will see a difference here when cPVA sub-pixels are inspected close up. As you can see, there is no sign of the sub-pixel being divided into zones. It is monolithic at any brightness. Besides, the sub-pixel has very uniform brightness. Particularly, it does not have the dark dot in the centre which can be seen in the photo of the S-PVA. This is returning to the older PVA structure of one zone, and 4 domains. Practical tests reveal that this cPVA structure doesn’t seem to impact gamma or colour tone shift compared with S-PVA structure which is positive. An example of a cPVA based screen is the Samsung F2380.

Images and some text courtesy of X-bit Labs


Advanced PVA (A-PVA)

There is very little official information about this technology but some Samsung monitors started to be labelled as having an A-PVA panel around 2012 onwards. We suspect that nothing has really changed from S-PVA / cPVA panels, but that the term “Advanced” has been added in to try and distinguish the new models, and perhaps compete with LG.Display’s successful IPS technology and AU Optronics AMVA technology where they have also added the word “Advanced” for their latest generations (see AMVA and AH-IPS).

SVA (definition uncertain)

During 2014 Samsung started to label their PVA panels as SVA, although the definition is currently unknown. In fact these are probably the only remaining mass-produced PVA panels on the market. Little information is available regarding any possible changes although we expect some improvements to response times and contrast ratios. We believe PSA has been used for these panels as well, much like AU Optronics have used it for their more recent AMVA generations. PSA is a process used to improve cell transmittance, helping to improve brightness, contrast ratio and liquid crystal switching speeds.

At the time of writing we have only seen this term used for their latest curved VA panels, so it may be something linked to that format. Contrast ratios of 3000:1 are now quoted for modern VA panels like this. Resolutions are offered at 1920 x 1080 and also 3440 x 1440 in ultra-wide 21:9 aspect ratio and curved formats. High refresh rate support is not offered at the moment so PVA variants are limited to 60Hz maximum.

PVA Generations Summary

PVA Summary Typical Modern Spec / Features
  • Early PVA panels designed as alternative to MVA, very similar performance overall
  • Later S-PVA and cPVA panels offered improved response times. Also improved contrast ratios to 1000 – 1200:1 typically
  • PVA now rarely used or produced in desktop monitor market. Samsung seemingly concentrating on IPS-type PLS instead.
  • Ultra-wide (21:9) and curved format displays now available (2015)
  • 8ms G2G response time (in practice mostly much slower)
  • 3000:1 contrast ratio
  • 178/178 viewing angles (somewhat unrealistic considering contrast shifts and off-centre contrast issue)
  • 16.7m colour depth through 8-bit panels mostly, some 6-bit+FRC used
  • Light / semi-glossy AG coating used




  • Contrast ratios pretty high with 1200:1 common in practice for older panels
  • Later developments allowed contrast ratios up to 3000:1
  • Response times adequate for some users where overdrive is used

  • Response time still slow compared with TN Film and IPS-type offerings.
  • No support for native 120Hz+ refresh rates
  • No PVA panels paired with blur reduction backlights to date
  • Off-centre contrast shift inherent to all PVA panel generations. Not ideal for colour critical work
  • Viewing angles not as wide as IPS/PLS. Some improvements in very recent generations
  • No 10-bit panels available


In Plane Switching (IPS)

In Plane Switching (IPS – also known as ‘Super TFT’) technology was developed by Hitachi in 1996 to try and solve the two main limitations of TN Film matrices at the time, those being small viewing angles and low-quality color reproduction. The name In-Plane Switching comes from the crystals in the cells of the IPS panel lying always in the same plane and being always parallel to the panel’s plane (if we don’t take into account the minor interference from the electrodes). When voltage is applied to a cell, the crystals of that cell all make a 90-degrees turn. By the way, an IPS panel lets the backlight pass through in its active state and shutters it in its passive state (when no voltage is applied), so if a thin-film transistor crashes, the corresponding pixel will always remain black, unlike with TN matrices.

IPS matrices differ from TN Film panels not only in the structure of the crystals, but also in the placement of the electrodes – both electrodes are on one wafer and take more space than electrodes of TN matrices. This leads to a lower contrast and brightness of the matrix. IPS was adopted for colour professional displays due to its wide viewing angles, good colour reproduction and stable image quality. However, response times were very slow originally, making IPS unsuitable for dynamic content.

We will talk about the characteristics of IPS matrices in the following sections.


Super-IPS (S-IPS)

The original IPS technology became a foundation for several improvements: Super-IPS (S-IPS), Dual Domain IPS (DD-IPS), and Advanced Coplanar Electrode (ACE). The latter two technologies belong to IBM (DD-IPS) and Samsung (ACE) and are in fact unavailable in shops. The manufacture of ACE panels is halted, while DD-IPS panels are coming from IDTech, the joint venture of IBM and Chi Mei Optoelectronics – these expensive models with high resolutions occupy their own niche, which but slightly overlaps with the common consumer market. NEC is also manufacturing IPS panels under such brands as A-SFT, A-AFT, SA-SFT and SA-AFT, but they are in fact nothing more than variations and further developments of the S-IPS technology.

In 1998 production started for Super-IPS panels, and were mostly produced by LG.Philips (now LG.Display). They have gone through several generations since their inception. Initially S-IPS built upon the strengths of IPS by employing an advanced “multi-domain” liquid crystal alignmentt. The term S-IPS is actually still widely used in modern screens, but technically there may be subtle differences making them S-IPS, e-IPS, H-IPS, or p-IPS (etc) generations for example. See the following sections for more information.

Images from LG.Display website, so take with a pinch of salt when comparing with VA!

Since their initial production in 1998 S-IPS panels have gained the widest recognition, mostly due to the efforts of LG.Philips LCD (now known as LG.Display), who were outputting rather inexpensive and high-quality 19″ – 30″ matrices. The response time was among the serious drawbacks of the IPS technology – first panels were as slow as 60ms on the “official” black-to-white-to-back transitions (and even slower on grey-to-grey ones!) Fortunately, the engineers dragged the full response time down to 25 ms and then 16ms later, and this total is equally divided between pixel rise and pixel fall times. Moreover, the response time doesn’t greatly grow up on black-to-gray transitions compared to the specification, so some older S-IPS matrices at the time could challenge TN Film panels in this parameter.

Demonstration of viewing angles on IPS vs VA matrices
Images from LG.Display website, so take with a pinch of salt when comparing with VA!

The IPS technology has always been at the top end when it comes to colour reproduction and viewing angles. Colour accuracy has always been a strong point, and even in modern displays the IPS matrices can surpass the performance of TN Film and VA equivalents. The viewing angles are a key part in this, since IPS matrices are free of the off-centre contrast shift that you can see from VA type panels. This is the reason why IPS is generally considered the preferred choice for colour critical work and professional colour displays, combining the excellent colour accuracy with truly wide viewing angles (178/178). S-IPS panels can show a purple colour when viewing dark images from a wide angle.

One main problem of the S-IPS technology traditionally was the low contrast ratio. Black depth was often a problem with S-IPS panels and contrast ratios of 500 – 600:1 were common for the early S-IPS offerings. However, these have been improved significantly, and contrast ratios are now much better as a result with modern IPS generations (see following sections). One other area which remains problematic for modern IPS panels is movie playback, again with noise being present, and only accentuated by the heavy application of overdrive technologies. S-IPS panels are sometimes criticized for their Anti-Glare (AG) coating, which can appear quite grainy and dirty looking, especially when viewing white/light backgrounds in office applications. Again that has been improved significantly in recent generations.

Moving Picture Image Sticking (MPIS) – S-IPS panels do not show any  image sticking when touching a moving image. On the other hand severe image sticking happens in VA panel and lasts after the image is changed for a short time.


Enhanced and Advanced S-IPS (E-IPS and AS-IPS)

Sometimes you will see these terms being used, but S-IPS is still widely used as an umbrella for modern IPS panels. In 2002 Advanced Super IPS (AS-IPS) boosted the amount of light transmitted from the backlighting by around 30% compared with the standard Super IPS technology developed in 1998. This did help boost contrast ratios somewhat, but they could still not compete with VA panel types. In 2005 with the introduction of RTC technologies (Overdrive Circuitry – ODC) and dynamic contrast ratios, LG.Display started to produce their so called “Enhanced IPS” (E-IPS, not to be confused with e-IPS) panels. Pixel response times were reduced across G2G transitions to as low as 5ms on paper.

Enhanced S-IPS builds on S-IPS technology by providing the same 178° viewing angle from above and below and to the sides, and greatly improves the off-axis viewing experience by delivering crisp images with minimal colour shift, even when viewed from off-axis angles such as 45°. You will rarely see this E-IPS term being used to be honest. You may also occasionally see the name “Advanced S-IPS” (AS-IPS) being used, but this was just a name given specifically by NEC to the E-IPS panel developed and used in their very popular NEC 20WGX2 screen, released in 2006. The AS-IPS name was also (confusingly) used by Hitachi in some of their earlier IPS generations as shown below, back in 2002.

Above: Evolution of IPS as detailed by Hitachi Displays: “IPS technology was unveiled by Hitachi, Ltd. in 1995, and put to practical use in 1996. Since then, it has evolved into Super-IPS, Advanced-Super IPS, and IPS-Pro.”

Further reading:


Horizontal-IPS (H-IPS)

In 2006 – 2007 LG.Display IPS panels have altered the pixel layout giving rise to ‘Horizontal-IPS’ (H-IPS) panels. In simple terms, the manufacturer has reportedly reduced the electrode width to reduce light leakage, and this has in turn created a new pixel structure. This structure features vertically aligned sub-pixels in straight lines as opposed to the arrow shape of older S-IPS panels.

In practice, it can be quite hard to spot the difference, but close examination can reveal a less ‘sparkly’ appearance and a slightly improved contrast ratio. Some users find a difference in text appearance as well relating to this new pixel structure but text remains clear and sharp. H-IPS will also often show a white glow from a wide angle when viewing black images, as opposed to the purple tint from S-IPS matrices. This is actually more noticeable than the S-IPS purple tint and is referred to as “IPS glow”. Some IPS panels in high end displays are coupled with an Advanced True Wide (A-TW) polarizer which helps improve blacks from wide viewing angles, and reduces some of the pale glow you can normally see. However, this A-TW polarizer is not included in every model featuring H-IPS and this should not be confused. It is very rarely used nowadays unfortunately. H-IPS panels from around this time are sometimes criticized for their Anti-Glare (AG) coating, which can appear quite grainy and dirty looking, especially when viewing white backgrounds in office applications.

Close inspection of modern IPS panels can show this new H-IPS pixel structure, although not all manufacturers refer to their models as featuring an H-IPS panel. Indeed, LG.Display don’t really make reference to this H-IPS version, although from a technical point of view, most modern IPS panels are H-IPS in format. As an example of someone who has referred to this new generation, NEC have used the H-IPS name in their panel specs for models such as the LCD2690WXUi2 and LCD3090WUXi screens.

The following technical report has feedback from the LG.Philips LCD laboratory workers: “We designed a new pixel layout to improve the aperture ratio of IPS mode TFT-LCD (H-IPS). This H-IPS pixel layout design has reduced the width of side common electrode used to minimize the cross talk and light leakage which is induced by interference between data bus line and side common electrode of conventional IPS mode. The side common electrodes of a pixel can be reduced by horizontal layout of inter-digital electrode pattern where conventional IPS pixel designs have vertical layout of inter-digital electrodes. We realized 15 inch XGA TFT LCD of H-IPS structure which has aperture ratio as much as 1.2 times of corresponding conventional IPS pixel design.” ©2004Society for Information Display.

S-IPS Pixel Structure

Above: S-IPS structure taken from LM300WQ3-STA1 panel. Image credit to Kurtd

H-IPS Pixel Structure

Above: H-IPS structure taken from LM240WU4 panel. Image credit to Kurtd



During 2009 LG.Display began to develop a new generation of e-IPS (it is unclear what the “e” actually stands for) panels which is a sub-category of H-IPS. They simplified the sub-pixel structure in comparison with H-IPS (similar to cPVA vs. S-PVA) and increased the transparency of the matrix by producing a wider aperture for light transmission. In doing so, they have managed to reduce production costs significantly by integrating the panels with lower cost, lower power backlight units. This allowed LG.Display to compete with the low cost TN Film panels and Samsung’s new cPVA generation. Because transparency is increased, they are able to reduce backlight intensity as you need less light to achieve the same luminance now.

The drawback of e-IPS in comparison with S-IPS is that the viewing angles are slightly smaller. When you take a look at an e-IPS matrix from a side, the image will lose its contrast as black turns into grey. On the other hand, there is no tonal shift (as with TN and cPVA matrixes) and the viewing angles, especially vertical ones, are still much larger than with TN Film. Many e-IPS panels are actually 6-bit + AFRC modules (as opposed to true 8-bit) which might explain how the costs are kept very low in some cases, although in practice the FRC algorithm is very well implemented and you are unlikely to see any obvious side affects. Like H-IPS panels from years prior, e-IPS panels are sometimes criticized for their Anti-Glare (AG) coating, which can appear quite grainy and dirty looking, especially when viewing white backgrounds in office applications.

Although it’s unknown what the “e” stands for here, it’s likely that it means “economic” or similar, since these new panels are all about trying to keep production and retail costs low. With lower retail costs there is of course an added risk of inter-panel variance, which may lead to some quality control issues in some models.



These are new names which some manufacturers seem to promote a little around 2009 – 2010. It has been stated that these ‘new’ panels offer improved energy efficiency, but it’s unclear what the new letters stand for. Perhaps the ‘UH-IPS’ stands for ‘Ultra Horizontal-IPS’? It certainly seems these are just slightly updated versions of H-IPS panels as was e-IPS. It’s possible as well that UH-IPS is just the same thing as e-IPS, with different manufacturers using different terminology to try and separate their displays. We suspect that UH-IPS is either the same thing as e-IPS, or a sub-category of that development, which in turn is a sub-category of H-IPS.

Some spec sheets from LG.Display give some clues as to the differences. The lines separating the sub-pixels are smaller than with H-IPS and therefore the UH-IPS technology has an 18% higher aperture ratio. The drive for increased LCD panel transmissivity is not for the purpose specifically of increasing on screen brightness, but rather to maintain brightness and reduce backlight lamps, inverters, and optical films in order to lower panel costs. LG have used this terminology with some of their LED backlight monitors.

Above: Close up macro photo of UH-IPS / H2-IPS structure from HP ZR30W screen.
Image courtesy of Zibri. Click for original source





Another term used by some manufacturers around 2010 with the launch of their IPS screens. This “S-IPS II” reportedly has an even higher aperture ratio than UH-IPS (11.6% higher), further improving brightness and contrast and helping save energy. It looks also from the information available (above) that the pixel structure has been altered and is no longer vertical as with H-IPS, but more like the traditional S-IPS / AS-IPS “arrow” layout. This looks more like an e-IPS type development, but returning to the older S-IPS pixel layout as opposed to developing H-IPS.


Performance IPS (p-IPS)

This was a new name which NEC introduced in early 2010 with their new PA series of screens. Thankfully they’ve been kind enough to tell us what the ‘p’ stands for in their marketing, giving rise to the generation of ‘Performance IPS’ panels. This new panel name is being used in the new 24″ – 30″ sized screens (PA241WPA271W and PA301W). In fact the p-IPS name is just a sub-category of H-IPS technology, being created as a way for NEC to distinguish their new “10-bit” models from the rest of their range. In addition, when you look into the details of it the panels are actually an 8-bit module with 10-bit receiver, giving you an 8-bit + FRC module. This is capable of producing a 1.07 billion colour palette (10-bit) through FRC technology but it is not a true 10-bit colour depth.

There are very few true 10-bit panels out there in the market, although a 24″ 10-bit module was features in the HP LP2480zx for instance, but at a much higher cost. Some other high end models use true 10-bit panels as well, but you need to be a little wary of manufacturers specified 10-bit figures as they are not always 100% accurate.

It’s all very well saying a panel is capable of 10-bit colour depth (1.07 billion colour palette) as opposed to an 8-bit colour depth (16.7 million colours), but you need to take into account whether this is practically useable and whether you’re ever going to truly use that colour depth. Apart from the requirements of your application, operating system, graphics card and software, one more pertinent limitation is from a display point of view, where there must be an interface which can support 10-bit colour depth. At the moment DisplayPort and Dual-link DVI are the only options which can. A full 10-bit work flow is still extremely uncommon in the current market.

Regardless of whether you have a true 10-bit colour depth being displayed, a screen with 10-bit capabilities still has its advantages. The monitor should still be capable of scaling the colours well, even from 24-bit sources. Most of these 10-bit panels will also be coupled with extended internal processing which will help improve accuracy and these are better translated onto a 10-bit panel than they would be onto an 8-bit panel, giving less deviation and less chance of banding issues.

Further reading:


Advanced High-Performance IPS (AH-IPS)

This term was introduced by LG.Display in 2011 and primarily used when talking about their smaller panels, used in tablets and mobile devices. The term “Retina” (introduced by Apple) has also been used to describe these new panels, offering increased resolution and PPI. That seemed to be the main focus of AH-IPS panels when first introduced although they also offered an increased aperture size, allowing for greater light transmission and lower power consumption as a result. In the desktop monitor market the term “AH-IPS” has been used by several manufacturers in an effort to try and distinguish their new models, when in fact many could equally be described as H-IPS or e-IPS. With the high resolution aspect in mind, the modern 27″ 2560 x 1440 IPS panels could sensibly be referred to as AH-IPS and the term has been used for some of the very recent panels. In fact there have been a couple of other changes in IPS based screens at around the same time (2012) with the introduction of wide gamut GB-r-LED backlighting, and the change in the Anti-Glare (AG) coating being used. With older S-IPS / H-IPS panels often being criticised for their grainy AG coating, this new lighter coating offers improved picture quality and sharpness.

The term AH-IPS seems to be widely used now in 2014/2015 for modern IPS panels, and with the arrival of other ultra-high res panels we expect it to be used for some time. Performance characteristics remain very similar to older H-IPS and e-IPS panel generations overall. Response times are generally very good nowadays, with quoted specs as low as 5ms G2G common. They aren’t quite as fast as modern TN Film panels still in most cases. Only very recently (2015) have high refresh rate IPS-type panels been introduced, although not by LG.Display (see AHVA section). At the time of writing there is no native support for 120Hz+ refresh rates at this time from LG.Display manufactured IPS-variants. Some Korean manufactured displays featuring IPS panels are capable of being “over-clocked” to 100Hz+ but this is not officially supported by the panel, and can really vary from one screen to another. Furthermore, response times are not adequate to provide optimum gaming experience in most cases, despite the improved refresh rate.

Contrast ratios were typically around 700 – 800:1 in practice up until a couple of years ago, but some can reach up to around 1000:1 – 1100:1 in the better cases nowadays. They are still not capable of challenging VA-type matrices in this area. Viewing angles are still wider than those offered by VA and TN Film panels, with a more stable image and less contrast/colour shift across the panel. They are also free from the off-centre contrast shift issue seen on VA panels. When viewed from an angle, dark content can show a pale / white glow which some user find distracting. This so-called “IPS glow” can be problematic on larger screen sizes, especially when working in darker environments or with a lot of dark content. It is often mistaken for backlight bleed, when in fact the glow changes as you change your line of sight or move further away from the screen.

LG.Display’s IPS panels are available in a wide variety of sizes and resolutions, including panels with Ultra HD (3840 x 2160), 4k (4096 x 2160) and even 5k (5120 x 2880) resolutions. A lot of their current focus seems to be on ultra-high DPI screens like this, and they are also investing in ultra-wide 21:9 aspect ratio and curved format displays in various sizes, up to 34″.

Further Reading: LG.Display AH-IPS Paper (April 2013)


Plane to Line Switching (PLS) / Super-PLS (S-PLS)

PLS was introduced by Samsung at the end of 2010 and designed to compete with LG.Display’s long-established and very popular IPS technology. It is an IPS-type technology and for all intents and purposes can be considered IPS, just being manufactured by another company. Samsung claimed they had reduced production costs compared with IPS by about 15% and so were making a play at the market of IPS panels when it was launched. At the time it was also being dubbed “S-PLS” (Super-PLS) but that name seemed to be dropped quite quickly in favour of just “PLS”. It wasn’t until mid 2011 that the first PLS displays started to appear, fittingly they were manufactured by Samsung themselves. The Samsung S27A850D was the first of its kind and its overall performance certainly reminded users of IPS panels.

Response times are very comparable to IPS matrices, with 5ms G2G being the current lowest spec on paper. There is currently no support for refresh rates above 60Hz from Samsung PLS panels, although there are some Korean manufactured screens which can be over-clocked to 100Hz refresh rates. This is not natively or officially supported though. Contrast ratios are typically around 700 – 900:1 in practice, although can reach up to 1000:1 in some cases as per their spec. Viewing angles are very comparable to IPS as well with wide fields of view and freedom from the off-centre contrast shifts you see from VA panels. From a wide angle dark content has a pale / white glow to it like modern IPS panels, again leading to a fair amount of so-called “PLS-glow” which can be distracting to some users. AG coating is also light, much like the light coating used on modern AH-IPS panels from LG.Display.

All in all, PLS is very comparable in practice to IPS. It should be noted that some display manufacturers market their screens as using an IPS panel, whereas underneath the hood the panel is actually a Samsung PLS matrix. Testament to how close these technologies are really considered although somewhat mis-leading. Samsung have largely moved away from their focus on PVA panels and are concentrating on PLS (and TN Film still) now instead. At the time of writing PLS panels are typically available in sizes between 23 and 27″ with resolutions up to 2560 x 1440. They do also have a 31.5″ panel with Ultra HD 3840 x 2160 available which is currently their largest. They do not currently manufacturer any ultra-wide 21:9 aspect ratio of curved format panels.


Advanced PLS (AD-PLS)

In 2012 some PLS based screens started to be marketed using the “AD-PLS” name. It is unclear what is supposed to have changed, if anything, with these recent panel variants. We suspect this is just a marketing name designed to keep up with LG.Display’s change to the “Advanced High-Performance IPS (AH-IPS)” name from the same time. Performance characteristics remain as described in the PLS section above.

Advanced Hyper-Viewing Angle (AHVA)

Again like Samsung’s PLS technology, AU Optronics have invested in their own IPS-type technology since 2012, dubbed AHVA. This technology is designed by AU Optronics as another alternative to IPS. Confusingly the AHVA name makes it sound like it’s a VA-type panel, which AU Optronics have been manufacturing for many  years. It should not be confused with AMVA which is their current “true” VA technology produced. The BenQ BL2710PT was the first display featuring this new technology and gave us some insight into the performance characteristics of AHVA, confirming how closely it resembled an LG.Display IPS panel.

Response time specs reach as low as 4ms G2G on paper but in reality the matrix does not perform any better than the faster IPS or PLS panel versions. Contrast ratios can reach up to the advertised 1000:1 and viewing angles are also very comparable to IPS. There is no off-centre contrast shift like you see on normal VA panels, but a pale glow is visible on dark content from an angle like with IPS/PLS. The AG coating is very light, often semi-glossy.

In very recent times (2015) AU Optronics have been the first to release official high refresh rate (144Hz) IPS-type panels, through their AHVA technology. The first display to use one of these panels was the Acer Predator XB270HU which was impressive when it came to refresh rate support and response times. We expect further panels to emerge at a later date with 120Hz+ refresh rates which can only be a good thing when it comes to gaming. With the addition of this high refresh rate we also saw the first inclusion of a blur reduction backlight (from the NVIDIA ULMB mode) on an IPS-type panel. Again a positive sign when it comes to the gaming future of IPS-type panels.

AU Optronics have invested in various panel sizes for AHVA ranging from 23.8″ up to 32″ in size. They offer resolutions also up to Ultra HD 3840 x 2160 currently, but lacking 4k or 5k support. They are currently investigating a 27″ curved AHVA panel with 2560 x 1440 resolution but it has yet to be released, and if it does make it to production would be the first AHVA panel with a curved format offered. They have yet to investigate 21:9 aspect ratio ultra-wide panels though.


IPS Generations Summary

IPS Summary Typical Modern Spec / Features
  • Early IPS panels designed for colour enthusiasts
  • S-IPS improved response times somewhat. Contrast ratio still an issue
  • H-IPS changed pixel structure, improved response times with overdrive, contrast ratio improved
  • e-IPS and other variants of H-IPS helped drive down production costs and make IPS more mainstream
  • p-IPS developed to offer 10-bit colour depth support
  • AH-IPS is current generation being produced by LG.Display
  • Alternative IPS-like technologies introduced by Samsung (PLS) and AU Optronics (AHVA) to compete
  • LG.Display IPS versions available in range of size and resolutions including Ultra HD, 4k and 5k
  • Samsung PLS versions available typically up to 27″ in size with Quad HD resolution. Some larger 31.5″ with Ultra HD are their max
  • AU Optronics AHVA versions available up to 32″ in size with up to Ultra HD resolution
  • 5ms G2G response time (in practice a little slower)
  • 1000:1 contrast ratio (typically achieving 900 – 1100:1 now)
  • 178/178 viewing angles (mostly realistic)
  • 16.7m colour depth common through 8-bit panels mostly, some 6-bit+FRC used
  • 1.07b colour support available from 8-bit+FRC and 10-bit panels
  • Many older panels have grainy AG coating
  • Lighter AG coating used on most modern AH-IPS panels and PLS/ AHVA variants




  • Viewing angles are widest of the technologies. Reduced contrast and colour shift. Freedom from off-centre contrast shift seen from VA matrices
  • Response times of modern generations now very good, better than VA
  • AHVA versions can now support 144Hz refresh rates
  • First panels to be paired with blur reduction technologies now available
  • 10-bit panels available

  • Limited support for native 120Hz+ refresh rates compared with TN Film panels. Expect further uptake from LG.Display and Samsung to rival AUO’s offering
  • Older variants criticised for grainy AG coating
  • Distracting white glow from an angle when viewing dark content (IPS glow)

Understanding complete circuit of led tv panel


In this tutorial we will discuss complete details of panel driver, MLG , Vcom in complete details . Follow the presentation

V59 universal board for TV


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compatibility chart of notebook io controllers


Dear all Laptop technicians,

Today i will discuss about compatibility of notebook io controllers. See inside io controller thr is embedded controller. IF that embedded controlller is same in structure , we can go for exchange of io controller. TO know more about it , you have to go to our online laptop repairing training.

Plz find list of notebook io controller compatibility

EC1 Change EC2 Platform
KB3310QF-B0 ASUS All-in-One PC ET1602C
KB3310QF-B0 ASUS EeePC 900
KB3926QF-A2 Quanta AT3
KB3926QF-D2 Quanta OP6, QT6
KB930QF-A1 Quanta R23
KB926QF-C0 Compal LA-3551P
KB926QF-D3 Compal LA-6552P
KB926QF-C0 Lenovo G550 – Compal LA-5082P
KB926QF-C0 Compal LA-6061P
KB926QF-D3 Compal LA-6311P, Lenovo G555 (LA-5972P)
KB926QF-D2 Compal LA-6421P, LA-6221P
WPC8769LDG WistronBiwa, Aspire 5920G – Quanta ZD1
WPC8769LDG Alienware M15x – Quanta MX3(Maddog 2.5)
NPCE783LA0DX Quanta ZQ1
IT8500E ASUS K40AB, K40C, K50C, K50AB
IT8500E Acer 6920
MEC1308-NU Samsung R530 (BREMEN-L3, 1.0, BREMEN-L4, r1.4), Samsung R519 (BONN-L)

Communication on notebook motherboard


When we look at communication on notebook motherboard , i think it embodies the latest communication technology developed till now. If we discuss communication(chip-to chip , chip to device) on notebook motherboard, it can be very easily understood , if we take analogue of computer network . Like in computer network , we have router, modem , LAN cable and computers are connected on LAN each with its own IP . similarly in notebook there are various chips like CPU , north bridge, south bridge, IO controller, BIOS and all need to communicate each other .And each device /chip have its own address and the process of memory address initialization occurs when bios is read at boot time. Where are the lan wires on the notebook ? its thr in form of buses and then we have differenty types of buses and the core type is same PCI or PCI Express . Lets look connection between north bridge(GMCH/MCH) and CPU , we can see DMI(Direct media interface) written on schmeatics , this is a type of PCI in board implementing below ICH5(older boards) and this connection is type of PCI Express(newer boards implementing ICH8 and more) . Now where is the router on notebook .As we know router routes/forwards the address. , similarly memory controller ( memory controller is in GMCH and newer boards In CPU) , so GMCH is the router , it lets CPU to access any components. The CPU doesnt know how many devices are thr and how much ram is thr , it just forwards the address to GMCH , and the magic is that BIOS address is hardcoded , its address has remain unchanged since the evolution of computer and CPU forwards its request at same address in any kind of boards(i3, dual core, core2 duo) . In my coming post i will give insight in more details .

laptop repairing course

laptop repair debug card


laptop repairing courseMost of the repairing engineer check voltages up to Power on of CPU and the process after CPU get reset signal to the stage where display comes is full of interesting stage. The real magic is how the CPU addresses several North Bridge, South Bridge, BIos rom and system RAM . How does the bios code is run from BIOS Rom by CPU .How is it connected ? and how do we check that the CPU after getting power is ready .There are several signals involved and several addressing mechanism. There is lot of computer architecture involved , but i will simplify things in my coming video. Even though 90% of problems are power related, but if we know this stuff ,we can understand each error message in debug card . So in my coming post i will discuss about memory addressing, Bios rom access, PCI & PCI express connections.

In our laptop repairing training , we put emphasis on complete solution right from hardware to software(power issues, bios issues) .For properly using debug card one must have good knowledge of various bus connections in the laptop.

chiptroniks laptop repairing presentation


Plz find our presentation on our laptop training. Call us on 011-47592046 to book your training.
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notebook embedded controller (laptop repairing)


Notebook Embedded Controller Introduction

Today in this article I will discuss a very important topic of Notebook Embedded Controller which is a key element in laptop repairing.

The  position of the BIOS (Basic Input / Output System, basic input output system) in the  entire system is very important  , which implements the underlying hardware and operating system, the upper North  bridge. For Example  for  copying  a file from the CD to the hard drive, we  need to know, “copy and paste” command, we need  not require  exactly how to read from the CD, and then how to write to the hard disk. For the operating system, BIOS also only need to issue commands to, without having to know how to read the disc, a hard disk is how to write. BIOS build the operating system and underlying hardware bridge.
And we usually say the BIOS settings which mean its software settings, such as setting the boot order, disable / enable some features and so on. But there is a problem in the hardware, BIOS is how to achieve it? After all, the software is running on the hardware platform, right? So we must mention Embedded Controller .

ž  EC (Embedded Controller) is a 16-bit microcontroller, which itself has a certain capacity within the Flash to store the EC code. EC’s position in the system, not inferior to north and south bridge, the system is turned on in the process, EC controls the vast majority of important signal timing. In  notebook, EC is always open, whether you are in the boot or shutdown state, unless you completely remove the battery and the Adapter.
In the off state, EC to keep running, and waits for the user’s boot information. In the boot, EC even as a keyboard controller, charging indicator light and fan control equipment, and it even controls the system standby, hibernation state.

The EC now has two architectures,:

(A) that the BIOS FLASH via X-BUS received EC, and EC southbridge through the LPC received, generally this case the EC code is also placed in FLASH , that is, and BIOS share a FLASH.

(B)The right is relatively new architecture, EC and FLASH together received LPC bus, generally only uses EC internal ROM. As for the LPC bus, it was originally intended to replace low INTEL behind the launch of X-BUS bus standard.

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Dicitionary of Laptop Chip level Repairing



C : Capacitor
L : Inductor
PC : POWER Capacitor
PL : POWER inductor
T : Transformers
X : Terminal strips , terminations , joins
Y : Crystal ( crystal clock oscylator )


AC           : Alternating current
ACDRV    : AC adapter to system – switch driver output
ACGOOD : Valid adapter detect active-low open – drain logic output
ACN        : Adapter current sense negatif
ACP        :Adapter current sense positif
ACOP      : Input Over – Power Protection
ACOV      : Input Overvoltage Protection
ACP        : Adapter current sense resistor , positive input .
BT           : BUTTON
CHGEN     : Charge active-low enable input logic
CIN         : Input Capacitor
CRT        : Cathode ray tube
DC          : Direct current
EMI         : Electromagnetic Interference ( ELECTROMAGNETIC INTERFERENCE )
F             : FUSE
FSEL        : Frequency Select Input .
GND         : Ground
GP           : GROUND PIN
HDMI       : High – Definition Multimedia Interface
ID            : Continuous Drain Current
IDM         : Pulsed Drain Current
IIN           : Operating Supply Current
IIN ( SHDN ) : Shutdown Supply Current
IIN ( STBY ) : Standby Supply Current
IS            : Continuous Source Current ( Diode Conduction )
Ivin          : Battery Supply Current at VIN pin
JP            : JUMPER POINT
LGATE      : Lower -side MOSFET gate signal
LPC          : Low Pin Count
LVDS        : Low – voltage differential signaling ( SYSTEM PENSIGNALAN )
PCI           : Peripheral Component Interconnect
PGOOD     : Power good open – drain output
PSI #        : Current input indicator
PVCC        : positive power supply IC
TD            : Death Time
TMDS        : Transition Minimized Differential Signaling ( DATA TRANSMISSIONS teknology )
TP             : TEST POINT
UVLO         : Input undervoltage lock -out
V               : vOLTAGE
+ V            : PWR MORE ( +3 V = MORE THAN 3Volt )
VADJ          : Output voltage regulation
VCCP          : power chip ( ich , graphic chips )
VCORE        : POWER processors ( vCPU )
VDD            : control power supply
VDDR          : POWER DDR ( VDRAM / VRAM / Vmem )
VFB            ; feedback inputs Power
VIN             : Input Voltage Range
VIN             : ADAPTER power supply ( vol_in )
VL              : Power Lock
VL              : voltage across the load / resistor load voltage
VLDOIN       : Power supply of the VTT and VTTREF output stage ( to Powermos ) VOT            : Volt_out
VRAM          : Power Random acses memory
VS               : SUITCH POWER/voltage on switch
VS +            : VOLTAGE SUPPORT
VSS             : Signal ground .
VSW            : POWER SWICT
VUSB           : USB POWER/voltage USB

laptop motherboards huge stock


CHIPTRONIKS  repairing centre CHIPMENTOR  has huge stock of fully tested motherboards with good quality at affordable prices. Our all laptop motherboards are functionally tested also . For new order , call 011-43464998 or  + 91 9971004998

Acer 5253
Acer 4315/4715
Acer 5315 GM
Acer 5517 amd
Acer 5570
Acer 5570
Acer 5732Z GM
Acer 5736 965
Acer 5742
Acer 5750G
Acer 5750Z
Acer 6930G GM
Acer D255
Acer D257
Acer E725 DDR3
Acer Extensa 5620
Acer A110/A115

Compaq /HP
Compaq CQ42 AMD 592809-001
Comapq Cq42 I3 GM
Comapq V5000 Intel GM
Compaq CQ42 DDR3
Compaq 6710B
Compaq 6730B Intel GM 486248-001
Compaq C700
Compaq CQ40 intel
Compaq CQ42 I3
Compaq CQ42 with CPU
Compaq Cq60 AMD
Compaq Cq60 Intel
Compaq Cq61 AMD GM
Compaq Cq61 Intel GM
HP 550
HP 2133 MINI 482275-001
HP 540/6520S Intel GM 960
HP 6520s
HP 6530S
HP 6530S Intel intel
HP CQ320/430/620
HP CQ42 I3 inbuilt CPU PM
HP CQ56 C2D Cq42 DDR2 616449-001
HP DM 3 (PM) 581172-001
HP DM3 PM 58066-001
HP DM4 636944-001
HP DV 2 AMD (PM) 573272-001
HP DV 5TI3 (GM) 607605-001
HP DV 7 C2D DV5 TYPE PM 516292-001
HP DV4 C2D GM W/o Graphic
HP DV4 C2D PM With Graphic
Hp Dv50000 with Nvidia
HP DV6 C2D (GM) DV5 TYPE 518433-001
HP DV6 /Dv7 578131-001
HP DV6000 449903-001/449901-001
HP DV6-2000 i5 590976-001
Hp DV6-3000 603644-001
HP DV6-3000 GM
HP DV6T i3 Inbuilt CPU
HP DV6T-3000
HP DV9000 945
Hp G4/G6 Hm65 GM 636373-001
HP G62 615849-001
HP MINI 1000 (SCALE TYPE) (GM) 516175-001
HP MINI 110 (L TYPE) GM 537662-001
Hp Nx6115 AMD
HP NX6120
Hp Nx6325 AMD
HP NX8220/Nc8230
HP Probook 4320S 599521-001
HP Probook 4420S 599520-001
HP TX2/Tx2500 504466-001

Dell 1015 DDR2
Dell 1535 GM
Dell 1569 AMD GM
Dell 5030 AMD
Dell D510
Dell D620 W/o
Dell D630 With Grapic
Dell D820 with Nvidia
Dell E1501 AMD
Dell E1505 I6400
Dell E4300 with CPU
Dell E5400
Dell E5500
Dell E6400 w/o
Dell E6400 with grapic
Dell Insp. 1440
Dell M5010 GM
Dell N4010 W/o Grapic
Dell N4010 With grapic
Dell N5010 GM
DELL studio 1450 (PM) With Graphic
Dell Vostro 1200
Dell XPS 1330 with Graphic
Dell XPS 1340
Dell XPS 1640

Sony MBX-160
Sony MBX-165
Sony MBX-176 One in one PC M/b
Sony MBX-177A GM
Sony MBX-190
Sony MBX-214 GM
Sony MBX-223
Sony MBX-224 M960
Sony MBX-224 M961
Sony mbx-237

Toshiba A300PM Graphic card supported
Toshiba C650 DDR2
Toshiba L510
Toshiba L655 AMD
Toshiba M300D AMD
Toshiba Satillite-A100 GM (915) Green
Toshiba Satillite-L300/L300D AMD

IBM /Lenovo
IBM X201 63Y2064
IBM T40/T41/T42 with ATI
IBM X40 27R1925
IBM X41 39T5519
IBM-T400/R400 42w8125
IBM-T61 (15.4″) 42w7653
Lenova G530 w/o
Lenova G570 AMD
Lenova Y450 PM
Lenova Y460 PM/Y560 DAKL2FMB8F0
Lenova Z470/Z570 I 3 Intel PM DDR3 DAOKL6MB8GO
Lenovo E43 C2D GM DDR2
Lenovo G470
Lenovo G560 PM

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