Optics: image projectors – Plural projection paths with single light source
Patent
1986-11-25
1989-04-04
Miller, Stanley D.
Optics: image projectors
Plural projection paths with single light source
350345, 350117, 353 20, G02F 113, G03B 2156, G03B 2114
Patent
active
048180734
ABSTRACT:
For enhancing the contrast of a picture on a projection screen derived from a liquid crystal display, the analyzer which is normally part of the liquid display unit is incorporated either in front of or in back of the screen relative to the viewing area or may constitute a layer between the front and rear portion of the screen. In any of these positions, the presence of the analyzer will result in darker dark portions and therefore in enhanced contrast. When used in front of the screen relative to the viewing area, protection of the lenticular surface also results.
REFERENCES:
patent: 1610423 (1926-12-01), Cawley
patent: 4083626 (1978-04-01), Miyahara et al.
patent: 4088400 (1978-05-01), Assouline et al.
patent: 4239349 (1980-12-01), Scheffer
patent: 4315258 (1982-02-01), McKnight et al.
Miller Stanley D.
North American Philips Consumer Electronics Company
Phan Trong Quang
Rich Marianne R.
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