Liquid crystal display projection system having improved contras

Details Liquid crystal display projection system having improved contras Liquid crystal display projection system having improved contras

1989-07-13

1991-09-17

Miller, Stanley D.

Optics: image projectors

Plural projection paths with single light source

350345, 350117, 353 20, 353122, 358 61, G02F 113, G03B 2114, G03B 2100, H04N 931

Patent

active

050489313

ABSTRACT:
For enhancing the contrast of a picture on a projection scrren 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 portions and therefore in enhanced contrast. When it is 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.
patent: 4614619 (1986-09-01), Shannon
patent: 4637896 (1987-01-01), Shannon

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