High dynamic range electro-optical shutter for steroscopic and o

Details High dynamic range electro-optical shutter for steroscopic and o High dynamic range electro-optical shutter for steroscopic and o

1991-09-19

1992-05-26

Arnold, Bruce Y.

Optical: systems and elements

Light control by opaque element or medium movable in or...

359 63, 359900, 358 92, G02B 2602, G02F 113, H04N 1300

Patent

active

051173026

ABSTRACT:
A high dynamic range electro-optical shutter for stereoscopic and other applications, and a method for increasing the dynamic range of an electro-optical shutter system. The shutter of the invention is derived from an existing electro-optical shutter by adjusting the tilt angle of the plane of the shutter's surface in the optical path of the apparatus in which it is employed. The invention is based upon the finding that light rays transversing an electro-optical shutter which are not perpendicularly to the plane in which a surface of the shutter lies, can have a significantly higher dynamic range than axial rays. In accordance with the invention, the angle at which the shutter is mounted in an apparatus is adjusted to produce a dynamic range which is high enough for the intended application. By mapping the pattern of spatial distribution of dynamic range, it is possible to design and produce shutters which are low in manufacturing cost, yet have performance which equals that of more costly shutters.

REFERENCES:
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patent: 4792850 (1988-12-01), Lipton et al.
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patent: 4967268 (1990-10-01), Liptone et al.
patent: 5054891 (1991-10-01), Masakatsu
Lipton, "Factors affecting `ghosting` in time-multiplexed plano-stereoscopic CRT display systems," SPIE Proceedings, vol. 761, 1987.
Havens, "A liquid-crystal video stereoscope with high extinction ratios, a 28% transmission state, and one-hundred-microsecond switching," SPIE Proceedings, vol. 761, pp. 23-26, 1987.

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