Liquid crystal light valve showing an improved display contrast

Details Liquid crystal light valve showing an improved display contrast Liquid crystal light valve showing an improved display contrast

1988-10-06

1989-12-05

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

350333, 350336, 340765, 340784, 340805, G02F 113

Patent

active

048848751

ABSTRACT:
A light-addressed liquid crystal light valve comprises a transparent insulating substrate having either one-dimensional or two-dimensional arrays of light switching elements thereon which can perform switching with an incident light, another opposing transparent substrate having transparent electrodes and a liquid crystal sandwiched therebetween. Each of the light switching elements comprises a voltage divider circuit and an inverter circuit. The voltage divider circuit comprises a photoconductor element and a resistor element. The inverter circuit receives as input the voltage divided by the voltage divider circuit, while the output voltage from the inverter circuit is applied to one pixel electrode for the liquid crystal.

REFERENCES:
patent: 4432611 (1984-02-01), Wei
patent: 4534622 (1985-08-01), Harada et al.
patent: 4653860 (1987-03-01), Hendrix
patent: 4655552 (1987-04-01), Togashi et al.
patent: 4655554 (1987-04-01), Armitage
patent: 4679909 (1987-07-01), Hamada et al.
patent: 4693561 (1987-09-01), Ashley
"Application of the Liquid Crystal Light Valve to Real-Time Optical Data Processing", Bleha et al., "Optical Engineering", vol. 17, No. 4 Jul.-Aug. 1978, pp. 371-384.

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