Television – Video display – Projection device
Patent
1993-07-02
1995-06-20
Groody, James J.
Television
Video display
Projection device
348746, 348747, H04N 323, H04N 931
Patent
active
054264715
ABSTRACT:
An image projection system which comprises a light source, a color separating optical means for separating rays of light from the light source into blue, green and red light components, first to third liquid crystal panels each having an image forming center and being operable to modulate the associated light component in response to a video signal applied thereto thereby to form an image in a corresponding color, first to third projection lens assemblies associated with the first to third liquid crystal panels for projecting imagewise modulated light components, carrying the images formed respectively by the first to third liquid crystal panels, onto a screen in a superimposed fashion to provide a color picture. The first and third liquid crystal panels are positioned on respective sides of the second light valve and also positioned with their image forming centers displaced relative to the associated optical axes of the first and third projection lens assemblies. An aperture stop is provided in each of the first and third projection lens assemblies and is decentered relative to the optical axis of the first or third projection lens assembly in a direction parallel to the direction of displacement of the associated first or third light valve so that the luminance of the projected color picture is uniform over the entire surface of the screen with color non-uniformity being minimized.
REFERENCES:
patent: 4210928 (1980-07-01), Ohmori et al.
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patent: 4432011 (1984-02-01), Lehnert
patent: 5010397 (1991-04-01), Hasegawa
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patent: 5103302 (1992-04-01), Yoshida et al.
patent: 5237399 (1993-08-01), Inada et al.
patent: 5274480 (1993-12-01), Hirai et al.
Sannohe Sinya
Tanaka Takaaki
Groody James J.
Lee Michael H.
Matsushita Electric - Industrial Co., Ltd.
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