International Business Machines Corporation

Fuji Photo Film Company, Limited

Naoyuki Tsujimura

Kesanao Kobayashi

Akira Ushimaru

Toshihiro Ueki

Naohisa Tohjoh

A color filter for liquid crystal displays, has a red colored layer wherein a first red pigment where a 40%-transmittance wavelength at a short-wave end of a transmitted spectrum (short-wave 40%-transmittance wavelength) is in a range of 550 to 600 NM and a second red pigment where the short-wave 40%-transmittance wavelength is within 40 NM from the range of the first red pigment are mixed so that transmittance in a wavelength region of 450 to 500 NM is substantially 0%.

Color filter for liquid crystal displays

A light-sensitive composition for forming a black matrix comprises (a) a photopolymerizable unsaturated compound, (b) a photopolymerization initiator, (c) a binder and (d) a pigment, wherein the amount of monovalent metallic cations present in the pigment as impurities is not more than 5 ppm; a black matrix is formed from the composition; a color filter substrate comprises a transparent substrate and a color filter formed thereon, wherein it further comprises the foregoing black matrix formed thereon; and a liquid crystal display device comprises an array substrate provided thereon with display electrodes and switching elements, a color filter substrate, common electrodes and a liquid crystal injected in the space between the array substrate and the color filter substrate, wherein it further comprises the foregoing black matrix formed on the switching elements or on the color filter substrate. The black matrix shows desired shading properties without impairing the quality of driving elements even when it is directly formed thereon. Moreover, the surface area of the black matrix can be minimized and the opening of the picture elements can be increased.

Growing community of inventors

Kawasaki, Japan

Naoyuki Tsujimura