Light activated light valve with a silicon control element

Details Light activated light valve with a silicon control element Light activated light valve with a silicon control element

1986-10-31

1988-08-30

Miller, Stanley D.

350332, 350331R, 357 30, G02F 113, H01L 2714

Patent

active

047671920

ABSTRACT:
In contrast to existing light addressed light valves for projection displays which use a homogeneous CdS or Se photoconductive layer as the control element for a liquid crystal cell, a silicon photo-diode array is disclosed which makes an effective control element capable of applying a spatially varying AC voltage across a liquid crystal light valve. Writing may be done with a miniature CRT in an optical or electron excitation mode. It is shown that for a video mode the ratio of diode capacitance to liquid crystal cell capacitance associated with the diode, and the frequency of the applied square wave voltage, define the buildup or decay time of the liquid crystal cell voltage. Thus, the frequency of the applied AC voltage can be used to control sensitivity and transient response and there is no lag. The dynamic range of the cell voltage is shown to depend on the ratio of diode capacitance to liquid crystal cell capacitance. The display can be used in a storage mode by erasing with an AC voltage and writing with a constant voltage. The silicon photodiode array is compatible with a CCD frame store using direct minority carrer injection for writing. This light addressed version thus represents a desirable milestone in achieving an all solid-state projection display.

REFERENCES:
patent: 4032954 (1977-06-01), Grinberg et al.
patent: 4191452 (1980-03-01), Grinberg et al.
patent: 4345248 (1982-01-01), Togashi et al.
Hong et al., "Application of the LCLV to a Large Screen Graphics Display", SID Digest, May 1979.
"LALCLV for Projection Displays", IBM Technical Disclosure Bulletin, vol. 28, No. 4, 9-1985.
Bleha, W. P. et al., Proceedings SPIE, vol. 317, pp. 179 et seq., 1981.
Chang, I. F., Nonemissive Electro-Optic Display, Edited by A. Kmetz and F. K. Von Willisen, Plenum Press, 1978.
Chang, I. F. et al., "Bistable Storage Tube with AC Voltage Controlled Display Element," Proc. S.I.D., vol. 16, No. 4, pp. 227-233 (1975).

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