Title:
LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/1997/011403
Kind Code:
A1
Abstract:
An antiferroelectric liquid crystal display device which shortens the shift time (ferroelectric saturation time tr) from the dark state to the bright state in which a liquid crystal is in saturation, when a predetermined voltage is applied. A method which disposes a preceding driving period before a selection driving state and determines a value of a synthesis voltage of a scanning signal and a display signal in the preceding driving period which shortens the ferroelectric saturation time tr, and an apparatus using the value obtained by this method. A voltage having a value |Vx| is applied in the preceding driving period, a voltage having a voltage value |Vz| opposite in polarity to |Vx| is applied in the selection driving period, a voltage 0 is applied in other periods, and when the value |Vx| is changed while |Vz| is kept constant, the value |Vx| which makes the ferroelectric saturation time tr minimum is selected as the optimum preceding driving voltage |VM|.
Inventors:
IMOTO SATOSHI (JP)
EBIHARA HEIHACHIRO (JP)
EBIHARA HEIHACHIRO (JP)
Application Number:
PCT/JP1996/002683
Publication Date:
March 27, 1997
Filing Date:
September 18, 1996
Export Citation:
Assignee:
CITIZEN WATCH CO LTD (JP)
IMOTO SATOSHI (JP)
EBIHARA HEIHACHIRO (JP)
IMOTO SATOSHI (JP)
EBIHARA HEIHACHIRO (JP)
International Classes:
G09G3/36; (IPC1-7): G02F1/133; G02F1/137; G09G3/36
Foreign References:
| JPH04311919A | 1992-11-04 | |||
| JPH04311922A | 1992-11-04 | |||
| JPH04371919A | 1992-12-24 | |||
| JPH06214215A | 1994-08-05 | |||
| JPH04249290A | 1992-09-04 | |||
| JPH04311920A | 1992-11-04 | |||
| JPH04311921A | 1992-11-04 |
Other References:
See also references of EP 0793131A4
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