Image display apparatus of liquid crystal valve projection type

Details Image display apparatus of liquid crystal valve projection type Image display apparatus of liquid crystal valve projection type

1981-02-23

1983-06-21

Corbin, John K.

Optics: measuring and testing

Range or remote distance finding

With photodetection

35016217, 3501622, 350336, 350342, 350348, 350361, 356406, 358231, 358237, G02F 113

Patent

active

043890962

ABSTRACT:
A liquid crystal light valve projection type image display apparatus comprises an electro-optic element and a Schlieren optical system. The electro-optic element has a liquid crystal layer having a dielectric and optical anisotropy. An electric field having a spatial intensity distribution according to an image signal is applied to said liquid crystal at a spatial period, so that a spatially phase-modulated phase diffraction grating is formed in the liquid crystal layer. Thus, a projected image in enlarged form is obtained. The fact that the electric field with a spatial period is applied to the liquid crystal leads to a constant light diffraction angle, and the modulation of the diffraction light intensity in the applied electric field enables an image corresponding to the input image signal to be projected at high light utilization.

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