Stereographics Corporation

Sterographics Corporation

Arthur Berman

Lawrence D Meyer

Lenny G Lipton

James L Fergason

Lenny Liptoh

An achromatic liquid-crystal shutter with high dynamic range, good transmission, and high speed. The inventive shutter reduces the phenomenon of 'ghosting' (image doubling) that typically occurs in conventional plano-stereoscopic CRT displays due to the low dynamic range of surface mode liquid crystal electro-optical shutters included within such displays. The inventive shutter reduces crosstalk, thus allowing comfortable fusion to take place. In one preferred embodiment, the inventive shutter system is driven by a carrier-less voltage signal having time-averaged voltage substantially equal to zero, so that a simple, low power driving circuit suffices to drive the shutter. A pair of the inventive achromatic shutters may be employed in a wireless mode as a selection device for a field-sequential stereoscopic electronic display system.

Achromatic liquid crystal shutter for stereoscopic and other applications

A system and method employing a push-pull modulator for stereoscopic image selection. The modulator includes a pair of surface mode liquid crystal cells having orthogonal rub axes, and a linear polarizer having absorption axis bisecting the orthogonal rub axes, and has high speed, good transmission, and symmetrical dynamic range characteristics. A field-sequential steroscopic video image may be transmitted from a video display screen (or video projector) through the modulator as the cells of the modulator are driven so that fields of alternately left-handed circularly polarized light and right-handed circularly polarized light will emerge. The transmitted circularly polarized light may be viewed using passive spectacles incorporating circular polarizing filters.

Growing community of inventors

San Jose, CA, United States of America

Arthur Berman