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US 5,227,900 AGranted
Method of driving ferroelectric liquid crystal element
AssigneeCanon Kabushiki Kaisha
InventorsYutaka Inaba, Katsumi Kurematsu, Shuzo Kaneko
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AssigneeCanon Kabushiki Kaisha
InventorsYutaka Inaba, Katsumi Kurematsu, Shuzo Kaneko
Estimating the term…
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: T(V.sub.1)+T(V.sub.2)=100
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 said pixel electrodes and a counter electrode, wherein the method displays a gradational picture on the display element through one cycle scanning and comprises the steps of:
A ferroelectric liquid crystal device for displaying a gradational image picture and having a switching element provided for each of pixel electrodes arranged in a matrix array and ferroelectric liquid crystal interposed between opposite electrodes, comprising:
Dependencies are inferred from the claim text.