【转贴】IPS屏究竟是个什么玩意？内有e-IPS究竟是个什么玩意 - POPPUR爱换

　　还有e-IPS，可以注意到这个“e”为小写，被称为economic IPS，其实国外玩家都认为这块面板无非是经济版的H-IPS，在对比度与色彩上都要差上一截，一般被使用在中低端显示器上，在液晶电视上比较少见。色域达到了72%，开口率减小，从而使得可视角度提高，除了广角可视外在画质上没有什么建树。

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. 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, and dynamic contrast ratios ranged up to 1600:1 initially.

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 color 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.

Further reading:

Cleverdis - E-IPS Website Article
Enhanced Super IPS Whitepaper (LG.Philips Dec 2005)
LG.Display Website

e-IPS

During 2009 LG.Display began to develop a new generation of e-IPS panels which is a sub-category of H-IPS. They simplifed the subpixel structure in comparison with H-IPS (similar to cPVA vs S-PVA) and increased the transparency of the matrix. In doing so, they have managed to reduce production costs significantly, aiming 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. This helps keep costs down significantly compared with S-IPS.

The main drawback of e-IPS in comparison with S-IPS is that the viewing angles are smaller. When you take a look at an e-IPS matrix from a side, the image will lose its contrast as black turns into gray. 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. By the way, the contrast drop occurring when the screen is viewed from a side can be compensated by means of special correcting film (A-TW polarizer), but as e-IPS matrices are meant for midrange monitors and this film costs money, most products come without it. Some are actually 6-bit + AFRC modules in fact (as opposed to true 8-bit) which might explain how the costs are kept very low in some cases.

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.