Masking of light valve spill light

Details Masking of light valve spill light Masking of light valve spill light

1986-08-26

1988-07-05

Arnold, Bruce Y.

Optics: image projectors

Plural projection paths with single light source

35016211, 353 97, 358 62, G02B 2742, G02B 2758, G03B 2114, H04N 931

Patent

active

047550325

ABSTRACT:
Improved masking of light valve spill light is disclosed for Schlieren dark field light valves. The mask is deposited on the interior or exterior of the output window (58) and comprises an opaque area (90) which surrounds a transparent window area (91). The mask is characterized by a zone (92) of graduated density from transparent to opaque. The effect of the graduated density zone is to eliminate spurious light diffracted by the edges of the mask and significantly improves the performance of the light valve.

REFERENCES:
patent: 3290436 (1966-12-01), Good et al.
patent: 3352592 (1967-11-01), Good et al.
patent: 3437746 (1969-04-01), Good et al.
patent: 3571489 (1971-03-01), Coale
patent: 3702395 (1972-11-01), Rosendahl
patent: 3806236 (1974-04-01), Downing

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