MOS light valve with nematic liquid crystal operating in the sur

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

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359 74, 359 82, 359 93, 359 71, G02F 1135

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052454550

ABSTRACT:
A light valve (10) includes a layer of a liquid crystal (16), a MOS substrate structure (18) with a dielectric layer (24) and a semiconductor layer (26), and an optically isolating mirror (14) between the liquid crystal layer (16) and the substrate structure (18). An external AC biasing voltage is applied across the MOS substrate (18) and the liquid crystal layer (16). The liquid crystal layer (16) is sufficiently thick that it operates in the surface birefringent mode with a high contrast ratio and a short response time to changes in the write-in light beam, when a sufficiently high biasing voltage V.sub.p is applied.

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