What is the E-IPS and AS-IPS screen

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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."

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