Projection-type color display device
First Claim
1. A projection-type color display device comprising a light source for producing light, collimating means for collimating said light, color separation means for receiving said light and for separating said received light into the different colors of red, blue and green light, transparent liquid crystal light valve means for receiving said red, blue and green transmissive light and for modulating said light, a color synthesis cube prism having a reflecting surface for synthesizing said three monochromatic lights modulated by said light valve means, said transparent liquid crystal light valve means and said reflecting surface of said color synthesis cube prism each having a polarizing axis, said polarizing axis of said transparent liquid crystal light valve means being coincident with the polarizing axis of the color synthesis cube prism, and retro-focus projection lens means for projecting said synthesized image.
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Abstract
A projection-type color display device. The display device includes a light source which provides light and a color separation member which receives the light and which separates the received light into the different colors of red, blue and green light. A light valve device receives the red, blue and green light and modulates the light to produce images. A color synthesis cube prism synthesizes the three monochromatic lights modulated by the light valve. A projection lens system projects the synthesized image onto a screen for viewing.
105 Citations
12 Claims
- 1. A projection-type color display device comprising a light source for producing light, collimating means for collimating said light, color separation means for receiving said light and for separating said received light into the different colors of red, blue and green light, transparent liquid crystal light valve means for receiving said red, blue and green transmissive light and for modulating said light, a color synthesis cube prism having a reflecting surface for synthesizing said three monochromatic lights modulated by said light valve means, said transparent liquid crystal light valve means and said reflecting surface of said color synthesis cube prism each having a polarizing axis, said polarizing axis of said transparent liquid crystal light valve means being coincident with the polarizing axis of the color synthesis cube prism, and retro-focus projection lens means for projecting said synthesized image.
Specification