Drive method for twisted nematic liquid crystal shutters for ste

Details Drive method for twisted nematic liquid crystal shutters for ste Drive method for twisted nematic liquid crystal shutters for ste

1991-05-15

1993-01-19

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 55, 340805, 358 88, G02F 113, G09G 300

Patent

active

051811332

ABSTRACT:
A method for overcoming optical artifacts which are an intrinsic part of the performance of twisted nematic liquid crystal shutter devices. When power is shut off from a conventional shutter device of this type, the device exhibits a brief periodic flickering called "bounce". When the power is turned on, the device exhibits a similar flickering effect, known as "stumble." When a pair of such devices are used as lenses in a stereoscopic selection apparatus, these artifacts, which contribute nothing to the device's performance, are obtrusive and disturbing to the user. By carefully controlling the voltage to each shutter in accordance with the invention while turning the shutter on or off, these artifacts are eliminated or substantially reduced.

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P. J. box, P. A. Johnson, Jr., & K. R. Koehler/Beran, "A Liquid-Crystal Optical-Switching Device (Pi Cell)", SID 83 Digest, pp. 30-31.

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