EP 0448032 A2 19910925 - Method of driving ferroelectric liquid crystal element.
Title (en)
Method of driving ferroelectric liquid crystal element.
Title (de)
Verfahren zur Ansteuerung eines ferroelektrischen Flüssigkristallelementes.
Title (fr)
Méthode de commande d'un élément à cristal liquide ferroélectrique.
Publication
Application
Priority
- JP 7051190 A 19900320
- JP 7420591 A 19910315
Abstract (en)
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: T(V1) + T(V2) = 100 <IMAGE>
IPC 1-7
IPC 8 full level
G02F 1/133 (2006.01); G09G 3/18 (2006.01); G09G 3/36 (2006.01); G09G 3/20 (2006.01)
CPC (source: EP)
G09G 3/3651 (2013.01); G09G 3/367 (2013.01); G09G 3/2011 (2013.01); G09G 3/207 (2013.01); G09G 3/3614 (2013.01); G09G 2310/0251 (2013.01); G09G 2310/061 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0448032 A2 19910925; EP 0448032 A3 19921119; EP 0448032 B1 19960703; AT E140097 T1 19960715; DE 69120564 D1 19960808; DE 69120564 T2 19961219; JP 2805253 B2 19980930; JP H04218023 A 19920807
DOCDB simple family (application)
EP 91104222 A 19910319; AT 91104222 T 19910319; DE 69120564 T 19910319; JP 7420591 A 19910315