Achromatic liquid crystal shutter for stereoscopic and other applications
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United States of America Patent
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Dec 5, 1989
Issued Date -
N/A
app pub date -
Nov 2, 1988
filing date -
Oct 30, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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