Hologram Color Filter, Method for Fabricating the Same, and Color Liquid Crystal Display Comprising It
AssigneeSumitomo Electric Industries, Ltd.
InventorsToshihiko Ushiro, Kazuhiko Oda, Soichiro Okubo, Takashi Matsuura
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Abstract
A hologram color filter diffraction-separates an incident lightwave using a hologram to project thus separated lightwaves having different-wavelengths at intended positions with a specified spatial period. The hologram color filter comprises a light-transmitting substrate (21) and a light-transmitting diamond-like-carbon (DLC) film (22) formed on the substrate. In the DLC film, a relatively-low-refractive-index belt-shaped region (n1, 22a) and a relatively-high-refractive-index belt-shaped region (n2, 22b) are placed alternately.
Claims19
A hologram color filter having a function of a color filter that diffraction-separates an incident lightwave using a hologram to project thus separated lightwaves having different wavelengths at intended positions with a specified spatial period, the hologram color filter comprising
- (a) a light-transmitting substrate (21);
- and
- (b) a light-transmitting diamond-like-carbon (DLC) film (22) formed on the substrate;
- in the DLC film, a relatively-high-refractive-index belt-shaped region (n2, 22b) and a relatively-low-refractive-index belt-shaped region (n1, 22a) being placed alternately.
A color liquid-crystal-display unit, comprising
- (a) any one member selected from the group consisting of a plurality of light-emitting diodes and a plurality of lasers (91B, 91G, and 91R), the member being for emitting a blue-color lightwave, a green-color lightwave, and a red-color lightwave individually
- (b) a hologram color filter (84a) comprising a DLC film (22);
- and
- (c) a liquid crystal panel (85-89) comprising a plurality of pixels arranged with a specific spatial period
- in the DLC film (22), a relatively-high-refractive-index belt-shaped region (n2, 22b) and a relatively-low-refractive-index belt-shaped region (n1, 22a) being formed alternately the width and spacing of the high-refractive-index belt-shaped regions being varied periodically corresponding to the spatial period of the pixels.
Dependencies are inferred from the claim text.