Optically switching ferroelectric liquid crystal light valve hav

Details Optically switching ferroelectric liquid crystal light valve hav Optically switching ferroelectric liquid crystal light valve hav

1991-11-15

1994-05-17

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 70, 359 72, 359 75, 359 84, G02F 1133

Patent

active

053133218

ABSTRACT:
A liquid crystal light valve cell has two optically different states switchable therebetween by bias voltage in response to incident light. A ferroelectric liquid crystal layer is sandwiched by a pair of front and rear alignment layers to establish the two bistable states in the ferroelectric liquid crystal layer. A front electrode layer is disposed on the front alignment layer. An optically reflecting layer is disposed on the rear alignment layer. A photo-conductive layer is disposed on the reflecting layer and responsive to the incident light incident from the rear face of cell to increase its electroconductivity. A rear electrode layer is disposed on the photo-conductive layer in cooperation with the front electrode layer to apply the bias voltage between the multi-layer structure including the liquid crystal layer and the photo-conductive layer such that effective bias voltage is applied across the liquid crystal layer through the increased electroconductive region of photo-conductive layer to thereby effect the switching between the two bistable states. The multi-layer structure is sandwiched by a pair of front and rear transparent substrates to construct the liquid crystal light valve cell.

REFERENCES:
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patent: 4672014 (1987-06-01), Joiner et al.
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patent: 4714323 (1987-12-01), Katagiri et al.
patent: 4826293 (1989-05-01), Grinberg et al.
patent: 4925276 (1990-05-01), McMurray, Jr. et al.
patent: 5085498 (1992-02-01), Yamamoto et al.

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