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US 4,790,631 AGranted
Liquid crystal device with ferroelectric liquid crystal adapted for unipolar driving
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei Yamazaki
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Abstract
A liquid crystal device can be controlled by applying a positive (or negative) voltage to certain pixels and by removing the applied voltage through a main electrode arrangement in the form of a matrix. The liquid crystal layer embodying the liquid crystal device is entirely subjected, during operation, to a reverse electric field by a reverse voltage applied to an adjunct electrode arrangement. With this structure, each pixel defined in the liquid crystal layer is always subjected to an electric field so that a highly stabilized operation can be realized.
Claims4
A liquid crystal device comprising:
- a pair of substrates, at least one of which is transparent;
- a layer of ferroelectric liquid crystal interposed between said substrates having two stable states;
- an adjunct electrode arrangement for inducing an electric field normal to said substrate in said liquid crystal layer, in order that said liquid crystal layer be in one of of said states;
- and
- a main electrode arrangement for selectively inducing a reverse electric field in at least one of the pixels which are defined by said main electrode arrangement and change the state of the pixel subjected to said reverse electric field.
2 more elements
Dependencies are inferred from the claim text.