Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
Method for making an optical device using a laser beam interference pattern
 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. 
Nippon Telegraph and Telephone Corporation
G G
G02F G02F
inventional additional
Shigenobu Kinya Keiji Shinji
Sakai Kato Tanaka Tsuru