Viewing‐angle evaluation method for LCDs with gray‐scale images

Abstract

Abstract— A new evaluation method of viewing‐angle characteristics for liquid‐crystal displays (LCDs) with gray‐scale images has been studied. In this method, reverse images, excessively dark images, and excessively bright images, which are a serious problem while displaying gray‐scale images, are evaluated quantitatively along with the display contrast ratio. The viewing‐angle characteristics of several types of LCDs are compared using this method.

Evaluation method of electro‐optical transfer function for display devices

“…(6). (6) where n is the number of gray spacings (n is 9 in Table 6) and i is the number of gray levels (i = 0, 31, ..., 255 in Table 6).…”

“…Hirata et al and Sato et al showed a viewing-angle evaluation method using gray scale in 1993 and 1994. 6,7 In the point of view of communications between media devices, such as monitors, printers, scanners, and cameras, it is necessary to obtain a characterization method or model of the relationship between devices within a device-independent space or use a device-independent tool. [8][9][10][11] In order to reach those necessities, gamma has an important role in that each device has its own EOTF and can be corrected into targeted EOTF.…”

11.1: Invited Paper: Modern Methods for the Electro‐optical Characterization of Displays

“…Beside multiplexability [1], viewing angle has been a primary focus for LCD R&D teams [2], [3]. Failure of earlier technologies to achieve good results has favored the development of improved technologies like active matrices based displays as well as maintained an active effort in emissive technologies (Plasma displays, FEDs and more recently OLEDs [4], [5]).…”