Optically switching ferroelectric liquid crystal light valve

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

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359 72, 359 75, G02F 113

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050854984

ABSTRACT:
A liquid crystal light valve cell has two optically different states switchable therebetween by a 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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IEE Proceeding, J. Optoelectronics, vol. 134, No. 6, Dec. 1987, W. L. Baillie, "Developments of reflection mode liquid crystal light valves using Bi.sub.12 SiO.sub.20 as the photoconductor", pp. 326-332.
Applied Physics Letters, vol. 51, No. 16, Oct. 19, 1987, N. Takahashi et al., "High-speed light valve using an Amorphous Silicon Photosensor and Ferroelectric Liquid Crystals", pp. 1233-1235.
Applied Optics, vol. 17, No. 23, Dec. 1, 1978, A. Gara, "Phase Response of a Liquid Crystal Image Transducer", pp. 3696-3698.

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