Patent ID: 6069604
Filing Date: 2000-05-30
Classification: G09G

Abstract:
A display device including a ferro-electric liquid crystal material with a deformable helix disposed between first and second substrates, said display device comprising:a. a first group of picture electrodes supported by the first substrate;b. a second group of commonly-electrically-connected picture electrodes supported by the second substrate;facing pairs of the picture electrodes on opposite sides of the liquid crystal material defining respective pixels;c. a plurality of row electrodes;d. a plurality of column electrodes;e. a plurality of three-terminal active switching elements, each having a first terminal electrically connected to a corresponding one of the row electrodes, having a second terminal electrically connected to a corresponding one of the column electrodes, and having a third terminal electrically connected to a corresponding one of the first group of picture electrodes, each of said active switching elements being operative to electrically connect the column electrode and picture electrode, which are electrically connected to the respective second and third terminals, upon application to the respective first terminal of a selection voltage;f. means for presenting selection voltages to the row electrodes and data voltages to the column electrodes and for bringing, prior to selection, a row of the pixels to a fixed optical transmission state by means of an auxiliary signal during at least one of two consecutive drive periods; andg. a drive circuit for presenting a compensation voltage which determines the voltage amplitude of the auxiliary signal, at least a part of the compensation voltage being determined by the data voltage across a pixel during a previous drive period.