Optical-to-optical image transducer capable of accepting X-radia

Details Optical-to-optical image transducer capable of accepting X-radia Optical-to-optical image transducer capable of accepting X-radia

1985-01-22

1986-06-03

Howell, Janice A.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

250213VT, H05B 3300

Patent

active

045931992

ABSTRACT:
A device and method for converting an X-ray image into a corresponding output image with light from a different source and a phosphorescent layer in conjunction with a liquid crystal light valve. The light valve includes a photosensor layer comprised of a deposited semiconductor material having distinct light and dark photoconductivities, the light photoconductivity being substantially greater than the dark photoconductivity.
When impinged upon by an particular pattern of X-rays, the phosphorescent layer phosphoresces in a corresponding pattern, which phosphorescence in turn causes the semiconductor layer to be switched to its light photoconductivity in a pattern also corresponding to that of the input X-ray image. The pattern of switched semiconductor in the photosensor layer allows a biasing voltage to be switched over to the liquid crystal layer of the light valve in a corresponding pattern. This voltage pushes the liquid crystal over its electro-optic threshold thereby inducing an output image corresponding to the original input image.

REFERENCES:
patent: 3659149 (1972-04-01), Fleming
patent: 3829684 (1974-08-01), Assouline et al.
patent: 3971931 (1976-07-01), Jehle
patent: 4485389 (1984-11-01), Ovshinsky et al.
W. P. Bleha, "Progress in Liquid Crystal Light Valves," Laser Focus/Electro-Optics magazine, Oct. 1983 issue, pp. 111-120.

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