Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1981-02-03
1983-01-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
350342, G02F 1135
Patent
active
043683860
ABSTRACT:
The invention provides an image converter device which utilizes a liquid crystal cell in which a layer of a nematic material or a nematic-cholesteric mixture is enclosed between a first plate of a photoconductive material, provided with an external electrode, and a second transparent plate, provided with an internal electrode. The photoconductive material may be bismuth oxide, or a mixture of the latter with germanium or silicon oxide. A direct or alternative voltage is applied between the electrodes. An X-rays image, or an image displayed on the screen of a C.R. tube is projected onto the photoconductive plate whose conductivity, thus spatially modulated, causes a spatially variable voltage to be applied in the liquid crystal layer. Various electro-optical effects, such as dynamic scattering, controlled birofringence or controlled rotatory polarization in a twisted structure, can be used to make the projected image to appear in the liquid crystal layer illuminated by a visible light read-out beam and be directly observed or enlarged by projection onto a screen.
REFERENCES:
patent: 3592527 (1971-07-01), Conners et al.
patent: 3607388 (1971-09-01), Hori et al.
patent: 3803408 (1974-04-01), Assouline et al.
patent: 4015984 (1977-04-01), Ohta et al.
patent: 4068926 (1978-01-01), Nakamura et al.
patent: 4206979 (1980-06-01), Jost
Huignard Jean-Pierre
Le Berre Serge
Mayeux Christian
Micheron Francois
"Thomson-CSF"
Nelms David C.
Westin Edward P.
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