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Title:
DRIVING METHOD FOR ANTIFERRROELECTRIC LIQUID CRYSTAL ELEMENT
Document Type and Number:
Japanese Patent JPH0720830
Kind Code:
A
Abstract:

PURPOSE: To enable high-speed driving by perfectly resetting into an antiferroelectric state at a high speed within a selection period.

CONSTITUTION: This driving method has at least a first scanning period Se and second scanning period Sf. The voltage waveforms of the first scanning period Se and the second scanning period Sf are symmetrical to OV. The first scanning period Se and second scanning period Sf respectively have at least a selection period Sc and non-selection period Sd. A reset pulse Vrp is impressed in the first phase Sa of the selection period Sc and a select pulse Vs in the second phase Sb of the selection period Sc to a scanning electrode. The polarity of the voltage of the reset pulse Vrp is the same polarity as the polarity of threshold voltage to change the ferroelectric state into the other ferroelectric state when the state before the selection period Sc is in the one ferroelectric state. The absolute value of the voltage of the reset pulse Vrp is smaller than the absolute value of threshold voltage and larger then OV. In addition, the polarities of the reset pulse Vrp and the select pulse Vs within the same selection period Sc are the same polarity.


Inventors:
KONDO MASAYA
Application Number:
JP19166793A
Publication Date:
January 24, 1995
Filing Date:
July 06, 1993
Export Citation:
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Assignee:
CITIZEN WATCH CO LTD
International Classes:
G02F1/133; G09G3/36; (IPC1-7): G09G3/36; G02F1/133