Tatsuki Inuzuka

P-48: Guiding Principles of Gray Level Color Gamut on LCDs for FPD-TV Application

The gray level dependence of the color gamut on a LCD, PDP and CRT is evaluated in both dark and lighted rooms. The color gamut on the LCD decreases sharply with gray level, and the dark gray level color gamut on the LCD is smaller than that on the CRT or PDP in a dark room. However, in a lighted room, the gray level dependence of color gamut on the LCD is better than that on the PDP. A higher contrast ratio is effective for improving the color gamut on LCDs in the dark rooms and the value of over 10000:1 is a good guideline for LCD-TV design.

Extended profile structure with feedback signal based on ICC profile

ICC profile specification defines data format of color device characteristics to realize the accurate color reproduction. However, device characteristics are not constant on various conditions such as temperature, humidity, aging and so on. It may cause deterioration of the device independency. We have developed new extended profile structure based on ICC profile to compensate color deviation by sing feedback signal of variable factors. The effectiveness of the prosed method has been confirmed through experiments of color ink-jet printer. Proposed method can be implemented as an extension of existing ICC profile.