Method of driving ferroelectric liquid crystal element

Details Method of driving ferroelectric liquid crystal element Method of driving ferroelectric liquid crystal element

1991-03-19

1993-07-13

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 57, 359 85, 340784, G02F 1133, G09G 336

Patent

active

052279006

ABSTRACT:
A method of driving a liquid crystal display element in which a switching element is provided for each of pixel electrodes arranged in a matrix manner and a ferroelectric liquid crystal is sandwiched between the pixel electrodes and a counter electrode includes the steps of applying a reset voltage for resetting the entire pixel to a first stable state of the ferroelectric liquid crystal across the pixel electrode and the counter electrode, partially transiting the pixel to a second stable state by a tone signal voltage having a pole opposite to that of the reset voltage, and reversing the pole of the reset voltage every predetermined period. Assuming that a state reverse ratio of the ferroelectric liquid crystal is T(V)% when the tone signal voltage is V, a tone signal voltage V.sub.1 after negative resetting and a corresponding tone signal voltage -V.sub.2 after positive resetting satisfy the following relation:

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