Temperature compensation for photoconductive type liquid crystal

Details Temperature compensation for photoconductive type liquid crystal Temperature compensation for photoconductive type liquid crystal

1993-05-18

1995-04-11

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 72, 359 87, G02F 1133, G09F 932

Patent

active

054064007

ABSTRACT:
A photoconductive type liquid crystal valve maintains good gradation contrast characteristics in a projection image irrespective of if and when a possible temperature change occurs. The photoconductive type liquid crystal light valve comprises a laminated body including a liquid crystal layer 15, a photoconductive layer 15, and a light shielding layer 17, and a pair of driving electrodes which sandwich the laminated body and form an image forming area. A pair of temperature detecting electrodes are provided at positions out of the image forming area to sandwich at least the light shielding layer and detect a change in impedance of the light shielding layer, thereby detecting a temperature change of the light valve. By changing the level of a driving voltage signal which is supplied to the driving electrode on the basis of the detected temperature change, the gradation characteristics and contrast can be held constant from the time point of the initial setting of the black level even when the temperature fluctuates.

REFERENCES:
patent: 4045791 (1977-08-01), Fukai et al.
patent: 4425027 (1984-01-01), Portmann
patent: 4460247 (1984-07-01), Hilsum et al.
patent: 4919520 (1990-04-01), Okada et al.
patent: 5157525 (1992-10-01), Eaton et al.
patent: 5253074 (1993-10-01), Wortel et al.

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