Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-05-13
1994-07-05
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359102, 359 83, G02F 11335, G02F 113, G02F 11333
Patent
active
053272692
ABSTRACT:
A fast switching liquid crystal device, a method for making such a device, and eyewear incorporating the device for use in a stereoscopic viewing system. The device achieves a fast response time and high contrast by increasing the twist of the nematic material to 270 degrees and orienting the tilt angle of the material to be consistent throughout the twist. The liquid crystal device is constructed to have two transparent, essentially parallel substrates which are spaced apart by a desired cell gap distance, and on which are deposited electrodes. The electrode surfaces are coated with a polymer material which is conditioned to provide a means of aligning the director axes of the liquid crystal material, and to maintain a desired tilt angle between the director axes and the electrode surfaces. A chiral dopant is added to the nematic liquid crystal material so that the pitch of the material is approximately twice the gap distance of the cell. Polarizing filters are placed on the exterior surfaces of the substrates and are oriented to be either parallel or perpendicular to the direction of conditioning of the polymer coated electrode surfaces, and to be perpendicular to each other.
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R. L. Hubbard & P. J. Box, "Optical-Bounce Removal and Turnoff-Time Reduction in Twisted-Nematic Displays," IEEE Transactions on Electron Devices, vol. ED-28, No. 6, Jun. 1981, pp. 723-725.
Lipton Lenny
Tilton Mary
Sikes William L.
Standish Industries, Inc.
Trice Roy
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