Optical devices with high polymer material and method of forming

Details Optical devices with high polymer material and method of forming Optical devices with high polymer material and method of forming

1994-02-18

1998-05-12

Fahmy, Wael

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 53, 359 94, 359 95, 359101, G02F 113, G02F 1133, G02F 1137

Patent

active

057514526

ABSTRACT:
A polymer dispersed liquid crystal optical device is presented which has optical elements which control reflection, transmission and diffraction of incident light entering the device by adjusting the magnitude of the electrical field applied to the device between a maximum and a minimum limits. An optical element consists of a polymer material having an electrical field-independent refractive index, and a liquid crystal material having an electrical field-dependent refractive index. The optical elements are distributed through the device at specific inter-element spacings, thus enabling to generate reflection of incident light in accordance with Bragg's law of reflection. The inter-element spacings can also be varied by the application of the field, thus enabling to generate reflection of light of a desired wavelength. Such optical elements are ideal for use in full color optical display apparatus of a matrix driven type. Methods for producing the optical device and optical display apparatus are also presented.

REFERENCES:
patent: 4581608 (1986-04-01), Aftergut et al.
patent: 4781440 (1988-11-01), Toda
patent: 4812018 (1989-03-01), Kaboyashi
patent: 5057244 (1991-10-01), Nitta et al.
patent: 5350538 (1994-09-01), Moriwaki et al.
patent: 5357356 (1994-10-01), Konuma et al.
patent: 5392141 (1995-02-01), Jang
patent: 5442482 (1995-08-01), Johnson et al.

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