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(11) | EP 0 448 032 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Method of driving ferroelectric liquid crystal element and ferroelectric liquid crystal display |
(57) 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 V₁ after negative resetting and a corresponding
tone signal voltage -V₂ after positive resetting satisfy the following relation: |