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US 5,394,204 AGranted
Projection type image display device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTeruaki Shigeta, Takeshi Nishiura
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Abstract
A projection type image display device comprises plural light sources, optical converging systems, liquid crystal display elements, a color synthesizing system and a optical projection system.
Claims8
A projection type image display device comprising:
- a plurality of light sources including metal halide lamps for projecting a red color light, a green color light, and a blue color light,
- optical converging means for converging the light projected by said plurality of light sources,
- a liquid crystal display element for red color, a liquid crystal display element for green color, and a liquid crystal display element for blue color, each display element for controlling the transmission of collimated light from the converging means,
- a color synthesizing optical system which synthesizes light from each of said liquid crystal display element to form an optical image having a chromaticity level,
- an optical projection system which projects the optical image formed by said liquid crystal elements onto a screen, and
- means for individually adjusting the strength of each of said green color light, said red color light, and said blue color light to adjust said chromaticity level of the optical image;
- wherein each one of said plurality of light sources emits light of a specified spectral band which is different from the specified spectral band of each other one of said plurality of light sources.
4 more elements
Dependencies are inferred from the claim text.