The front side (front view) of the VA panel has the highest contrast, but the uniformity of the screen is not good enough, and color drift often occurs. Sharp text is its killer feature, and the performance of black and white contrast is also very good.

There’s been a significant growth in the monitor market when it comes to screens with LED backlighting. I wanted to provide an article which explains the technology in more detail as it is bound to become more and more widespread. The technology was originally quite expensive, but reduced production costs and improved manufacturing processes have allowed LED backlighting to be used in even the lower cost monitor market. We are now seeing an influx of new screens in all different sizes using LED backlighting, and it is also being combined with TN Film, VA and IPS panel technologies.

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The biggest feature of this type of IPS board is that its two electrodes are on the same surface, while the electrodes of other liquid crystal modes are arranged on the upper and lower sides, three-dimensionally. Since the electrodes are on the same plane, the liquid crystal molecules are always parallel to the screen no matter what the state, which will reduce the aperture ratio and reduce the light transmittance.

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So, the advantages and disadvantages of IPS panels are obvious. Advantages: higher viewing angle, faster response speed, accurate color reproduction. Disadvantages: there is a light leakage problem, the black purity is not as good as VA, and it needs to rely on optical film to compensate.

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Note: According to different panel production areas, the delineation of A-level panels is also different. South Korea's A-level boards require less than 3 dead pixels, Japan's less than 5, and Taiwan requires less than 8.

W-LED backlit models are becoming more and more mainstrea. Initially the technology was combined exclusively with TN Film panels, since low production costs (and low retail costs) were the name of the game. There are many TN Film based models out there with LED backlighting now. More recently, in the later half of 2010, we have seen models emerge combining W-LED backlighting with VA and IPS matrices. AU Optronics have released modules in several sizes which combine their AMVA panel technology with LED, and LG.Display have begun to release a combination of IPS and LED. The BenQ EW2420 and VW2420H were two of the first VA based screens on the market with LED. The NEC EA232WMi and forthcoming models from LG will be some of the first to use IPS + LED. We expect this trend will continue.

The liquid crystal panel TFT can be divided into three grades according to the quality of A, B and C. The difference is based on the number of dead pixels. However, there are no related hard and fast regulations in the world, so the grading standards of different countries and regions are not the same. Regardless of which standard is based, you must choose a professional and reliable LCD display manufacturers. The general situation is as follows:

Above: colour gamut of a typical standard gamut screen (72% NTSC) on the left,and an RGB LED backlit display covering 114% of the NTSC colour space on the right

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IPS panel technology is a LCD panel TFT technology introduced by Hitachi in 2001, commonly known as "Super TFT". It is currently the only hard-screen panel of TFT, and its application field has been very wide since its development. Products using IPS hard-screen generally have a higher positioning.

At the professional end of the market where RGB LED backlighting is used, it is combined with high end panel technologies such as AMVA (from AU Optronics) or IPS (from LG.Display). These panel technologies are more expensive to produce than the widely used TN Film panels in the mainstream market. When you are using an expensive backlighting unit, it obviously should be paired with a higher-end panel though. In fact, modern RGB LED displays such as the HP DreamColor LP2480zx even use a one-of-a-kind true 10-bit H-IPS panel (not 8-bit +AFRC like some of the other modern “10-bit” screens). RGB LED models are few and far between though of course.

If marketing is to be believed, LED backlighting offers you all kinds of advantages, but it’s important to understand what is true, and what is not. We will discuss different aspects and whether they are influenced by a different backlight source:

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VA stands for Vertical alignment (vertical alignment) panel. It can provide 16.7M colors and large viewing angles. Of course, the price is also more expensive. It is currently the most commonly used soft screen panel for LCD TVs.