Light valve for use in a color display unit with a diffraction g

Details Light valve for use in a color display unit with a diffraction g Light valve for use in a color display unit with a diffraction g

1986-06-03

1988-06-14

Birmiel, Howard A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340783, 340713, 350347R, 350348, 350351, 350345, 358231, G02F 1133, G09G 336

Patent

active

047515090

ABSTRACT:
In a display unit for use in projecting projection light onto a screen to display a picture, a light valve comprises a diffraction grating assembly for selecting one of chrominance components included in an incident light given through one surface of the light valve. The diffraction grating assembly is divided into a plurality of grating elements arranged to give different colors corresponding to the chrominance components. In addition, a control beam, such as a laser, is incident onto the other surface of the light valve to selectively scan the grating elements and to heat selected ones of the grating elements through an energy converting film. Thus, the incident light is subjected to modulation on the grating elements in accordance with heat energy and emitted through a liquid crystal as controlled light from the light valve. The controlled light is sent as the projection light to the screen.

REFERENCES:
patent: 3843231 (1974-10-01), Borel et al.
patent: 4365869 (1982-12-01), Hareng et al.
patent: 4499458 (1985-02-01), LeBarre et al.
patent: 4595260 (1986-06-01), Kubata
patent: 4639722 (1987-01-01), Urabe et al.
"Low Power Laser-Addressed Liquid Crystal Projection Display Device", Chang et al., IBM Technical Disclosure Bulletin, vol. 24, No. 3, Aug. 1981, pp.1570-1572.

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