Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Patent
1996-03-15
2000-05-23
Sikes, William L.
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
348751, 353 34, G02F 11335, G02F 100
Patent
active
060671289
ABSTRACT:
In an LCD projector, a color mixing optical system for mixing color beams transmitted through LCD elements includes an optical path length adjuster in three light paths from a light source to the LCD elements. The adjuster includes polarization beam splitters, phase plates, and light-beam reflectors. The numbers of reflections of the color beams in the optical paths from the light source to the projection lens are set only to odd values or only to even values. The adjusters are arranged and configured to equalize the respective optical path lengths to each other. With this configuration, the relative distribution of intensity of illumination is substantially equalized for the beams illuminating the respective LCD elements. Compounding the beams, there is attained a projected screen image with a satisfactory white balance and homogeneous chromaticity and luminance. Consequently, there is implemented an LCD projector capable of projecting on a screen an image having a favorable white balance and uniform chromaticity and luminance.
REFERENCES:
patent: 4864390 (1989-09-01), McKechnie et al.
patent: 5515202 (1996-05-01), Wright
S. Morozumi et al., "LCD Full-Color Video Projector", Society for Information Display (SID) 86 Digest, vol. XVII, 1986, pp. 375-378.
S. Aruga et al., "High-Resolution Full-Color Video Projector with Poly-Si TFT Array Light Valves", SID 87 Digest, vol. XVIII, May 12-14, 1987, pp. 75-78.
A.H.J. van den Brandt et al., "New Plusfactors n an LCD-Projector", Conference Record of the 1991 International Display Research Conference, Oct. 15-17, 1991, pp. 151-154.
NEC Corporation
Parker Kenneth
Sikes William L.
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