Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-02-28
1996-10-29
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, 359495, 353 34, G02F 1335, H04N 931, G02B 2728, G03B 2128
Patent
active
055702090
ABSTRACT:
The present invention provides a color projector utilizing three liquid crystal display elements. The natural light is separated into illuminating rays of red, green and blue colors by a dichroic mirror, each of these illuminating rays being used to illuminate the corresponding one of the liquid crystal display elements. Each of the liquid crystal display elements is controlled by a desired image signal with respect to its transmittance at each pixel. After passed through the liquid crystal display elements, three kinds of colored illuminating rays are again synthesized by the other dichroic mirror to form a light beam which in turn is enlarged and projected by a projecting lens on a screen. By providing light source means including means for converting the natural light into the linearly polarized beam, the illuminating rays may have their polarizing angles coincide with each other without any loss of light. As the linearly polarized beam is reflected by the mirror system, the illuminating rays of red, green and blue colors are changed with respect to their polarizing angels. Depending on the changed polarizing angles, the polarizing angle of the light rays incident on each of the liquid crystal display elements may be adjusted to remove any loss of light.
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Kida Hiroshi
Kondo Mitsushige
Shikama Shinsuke
Usui Masahiro
Duong Tai V.
Mitsubishi Denki & Kabushiki Kaisha
Sikes William L.
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