Showing papers by "Atsushi Takahashi published in 1998"

Color filter for liquid crystal displays

Abstract: A reflection-type color filter (30) is disclosed, in which light coming into one surface of a color filter layer (36) is reflected by a reflective layer (40) and allowed to pass through the color filter layer (36) twice. Colored patterns of the color filter layer (36) include resin such as polyimide and dye for dyeing the resin. The thickness of the colored patterns is 0.7 μm or less. In order to enhance light resistance, it is effective to increase the content of dye with respect to resin. The value of 0.7 μm is established in consideration of enhancement of optical characteristic and light resistance of the color filter used in the reflection type liquid crystal display device. In order to enhance light resistance, more preferably, a metal complex is added to the resin.

Color filter and reflection type color liquid crystal display device, and evaluating method therefor

Abstract: PROBLEM TO BE SOLVED: To provide a color filter for reflection type color liquid crystal display device that include respective color pixels of yellow(Y), magenta(M), and cyan(C). SOLUTION: Since the reflection type device passes light through a color filter twice, lightness should be given priority and in such a light range, a YMC system has a wider color reproduction range than an RGB system and is advantageous. The mean values of the lightness Y values of the respective colors of an XYZ coloration system as to the light which has been passed twice are set within ranges A to B. Namely, A is a value prescribed on condition that the color changes across some color density when the color density of color pixels is varied and corresponds to, for example, 68% at the time of standard light C. Further, B is a value prescribed on the basis of at least color density that respective color pixels require for color display and corresponds to, for example, 46% at the time of the standard light C.