Reflection type active matrix liquid crystal apparatus

Details Reflection type active matrix liquid crystal apparatus Reflection type active matrix liquid crystal apparatus

1991-06-18

1993-10-05

Heyman, John S.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 59, 359 63, 359 74, 359 87, 359 93, 359 67, G02F 1133, G02F 1137

Patent

active

052510492

ABSTRACT:
A reflection type liquid crystal apparatus comprising a liquid crystal panel (26) composed of a pair of first and second opposed plates (30, 32) for accommodating a liquid crystal (34) therebetween. A reflecting layer (28) is provided in the inner surface of the second plate, and the first plate is transparent. A common electrode (36) is provided in the first plate, and picture electrodes (38) are located in the second plate. A beam splitter (24) is located in front of the liquid crystal panel (26) for supplying polarized light to the first plate and for selectively transmitting polarized light emerging from the liquid crystal panel (24). The liquid crystal (34) comprises a nematic liquid crystal material having a positive birefringence and arranged in a homogeneous orientation with a constant director (n). This arrangement being such that incident polarized light is propagated in the liquid crystal in a double refraction mode with a first birefringence value and the emerging polarized light thereof is substantially transmitted by the second polarizer means (24) when a voltage is not applied to the liquid crystal; and incident polarized light is propagated in the liquid crystal in a double refraction mode with a second birefringence value smaller than the first birefringence value and the emerging polarized light thereof is not substantially transmitted by the second polarizer means (24) when a voltage is applied to the liquid crystal.

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Grinberg et al., "Liquid Crystal Light Valve for Coherent Optical Data Processing", Conference: Applications of Holography and Optical Data Processing--Aug., 1976, pp. 479-496.
Tsuda et al.--"Reflective Type LC Panel for High Definition LC Projection TV", 1989 Autumn National Convention Record--Sep. 1989--pp. 5-31.

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