An IPS‐LCD with a high contrast ratio of over 80:1 at all viewing angles

Abstract

Abstract— A 32‐in. IPS‐LCD with a significantly wide‐viewing‐angle performance has been developed using a new optical compensation method. It provides a contrast ratio of over 80:1 at all viewing angles, which enhances its color saturation at oblique angles. According to our study, it is important to shorten the path of the optical compensation in the Poincaré sphere. We have found an effective method using two retardation films, one with an Nz value larger than 0.5 and one with a value smaller than 0.5.

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

“…For IPS mode TFT-LCDs, positive LCs in the LCD cell are aligned and rotated parallel to the substrate. (+) C-plate, (À) A plate, biaxial compensation film or combination of multicompensation film may be used [48][49][50][51][52][53]. For MVA mode TFT-LCDs, negative LCs are aligned vertical to the substrate, thereby (+) Aplate, (À) C-plate, biaxial compensation film or combination of multi-compensation film may be adopted [54][55][56][57][58][59][60].…”