Multicolor projector employing diffraction grating type liquid c

Details Multicolor projector employing diffraction grating type liquid c Multicolor projector employing diffraction grating type liquid c

1991-01-23

1993-08-17

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 53, 359 49, 359 95, 359495, 359498, 359573, 359574, 353 31, 353 34, 358 61, G02F 1133, G03B 2126

Patent

active

052374351

ABSTRACT:
A projector capable of compactizing the structure and improving the efficiency of light utilization is disclosed. The projector has an illuminating system, a light modulation device and a projection optical system. A first and a second lights of mutually different colors are emitted from the illumination optical system. The light modulating device has a first light modulator for modulating the first light according to a first image signal and a second light modulator for modulating the second light according to a second image signal. Each of the first and second light modulators is provided with a grating, a liquid crystal filled in the grooves of the grating and a driver for driving the molecules of the liquid crystal. The driver is adapted to drive the molecules of the liquid crystal in such a manner that the liquid crystal and the grating have mutually substantially matching refractive indexes in a certain state but have mutually unmatched refractive indexes in another state, thereby generating or substantially erasing a diffraction grating by the grating and the liquid crystal. A first and a second images of mutually different colors are projected on a screen by the first and second lights from the first and second light modulators.

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