Focusing plate having phase grating formed by using liquid cryst

Details Focusing plate having phase grating formed by using liquid cryst Focusing plate having phase grating formed by using liquid cryst

1991-09-04

1992-06-16

Heyman, John S.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 79, 359 89, 359 94, 359 95, G02F 11343, G02F 11333, G02F 1137

Patent

active

051228882

ABSTRACT:
A focusing plate comprising two base plates, a liquid crystal layer held between the two base plates, and an electrode pattern which is formed on each of the two base plates for the purpose of rotating the liquid crystal molecules in the liquid crystal layer by applying an electrical field to the liquid crystal layer; the electrode pattern being so formed that, when the electrical field is applied, the liquid crystal molecules are rotated by the leakage electrical fields from the electrode pattern to form a phase-type diffraction grating in the liquid crystal layer.

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Field Effects in Nematic Liquid Crystals Obtained with Interdigital Electrodes, R. A. Soref, Jour. of Applied Physics, vol. 45, No. 12, Dec. 1974.
Surface Reorientation Liquid Crystals Display Device, A. Aviram and G. L. Gladstone, IBM Technical Disclosure Bulletin, vol. 15, No. 6, Nov. 1972.

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