Gradation methods for driving phase transition liquid crystal us

Details Gradation methods for driving phase transition liquid crystal us Gradation methods for driving phase transition liquid crystal us

1992-04-13

1993-12-28

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 54, 359 84, 359 90, 345 87, 345 89, G02F 11343, G02F 1137, G09G 336

Patent

active

052744841

ABSTRACT:
A method for driving a phase transition type liquid crystal display device having a liquid crystal display panel, fabricated by filling and sealing a phase transition type liquid crystal in a space formed between two substrates including two groups of electrodes thereon respectively and having a driving means applying the voltage between different electrodes, comprises a process of altering the length of the helical pitch by a time by applying the voltage a little higher or lower than the sustaining voltage to the selected picture elements for a short time or a process of altering the length thereof partially in one element by applying a similar voltage in the given portion of each element, so that gradational display with the middle brightness is attained.

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"Electric field induced color changes and pitch dilation in cholesteric liquid crystals", Frederic Kahn, Feb. 1970, Physics Review Letters.

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