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US 5,963,189 AGranted
Drive method, a drive circuit and a display device for liquid crystal cells
AssigneeSeiko Epson Corporation
InventorsAkihiko Ito, Shoichi Iino
Life of this patent
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Abstract
A multiplex driving method is provided for a liquid crystal cell device having a liquid crystal layer disposed between a pair of substrates, a plurality of row electrodes arranged on one of the substrates and a plurality of column electrodes arranged on the other substrate. The method comprises the steps of sequentially selecting a group of the plurality of row electrodes during a selection period, simultaneously selecting the row electrodes comprising the group, and dividing and separating the selection period into a plurality of intervals within one frame period.
Claims3
A drive method for a liquid crystal device comprising the steps of:
- (a) applying a scanning signal to each of a plurality of scanning electrodes comprising a selection signal during a selection period and a non-selection signal during a non-selection period;
- and
- (b) applying a data signal to each of a plurality of signal electrodes based on display data to be displayed by the liquid crystal device;
- wherein step (a) further comprises the steps of:
- (1) grouping the plurality of scanning electrodes into p groups, each group comprising at least i scanning electrodes including actual electrodes and at least one virtual electrode, wherein p and i are integers of at least two;
- and
- (2) applying the selection signal substantially simultaneously to the actual electrodes in one of the p groups, applying the non-selection signal substantially simultaneously to the actual electrodes in the one of the p groups immediately after applying the selection signal thereto and selecting a level of the selection signal based on an orthogonal function, wherein the selection signal is sequentially applied to succeeding groups of the scanning electrodes, wherein the non-selection signal is sequentially applied to succeeding groups of the scanning electrode groups immediately after applying the selection signal thereto, wherein the scanning signals has N selection periods and N non-selection periods per frame, wherein N is an integer of at least two, and applying the selection signal to each of the scanning electrodes in each of the N selection periods, and wherein the orthogonal function has information for determining a level of the selection signal;
- wherein step (b) further comprises the step of determining the level of the data signal based on a relation between the display data and the level of the selection signal applied to the i scanning electrodes including the at least one virtual electrode, wherein a virtual pixel is defined at an intersection of the virtual electrode and one of the plurality of signal electrodes.
5 more elements
A drive method for a liquid crystal device comprising the steps of:
- (a) applying a scanning signal to each of a plurality of scanning electrodes comprising a selection signal during a selection period and a non-selection signal during a non-selection period;
- and
- (b) applying a data signal to each of a plurality of signal electrodes based on display data to be displayed by the liquid crystal device;
- wherein step (a) further comprises the steps of:
- (1) grouping the plurality of scanning electrodes into p groups, each group comprising at least i scanning electrodes, wherein p and i are integers of at least two;
- (2) applying the selection signal substantially simultaneously to the at least i scanning electrodes in one of the p groups and applying the non-selection signal substantially simultaneously to the at least i scanning electrodes in the one of the p groups immediately after applying the selection signal thereto and selecting a level of the selection signal based on an orthogonal function, wherein the selection signal is sequentially applied to succeeding groups of the scanning electrodes, wherein the non-selection signal is sequentially applied to succeeding groups of the scanning electrode groups immediately after applying the selection signal thereto, wherein the scanning signal has N selection periods and N non-selection periods per frame, and wherein N is an integer of at least two, and applying the selection signal to each of the scanning electrodes in each of the N selection periods, and wherein the orthogonal function has information for determining a level of the selection signal,
- wherein step (b) further comprises the step of:
- (1) determining the level of the data signal based on a relation between the display data and the level of the selection signal, and
- wherein within the frame, at least one of the selection signals applied to N selection periods has a substantially 180.degree. phase difference from at least one other one.
6 more elements
A drive method for a liquid crystal device comprising the steps of:
- (a) applying a scanning signal to each of a plurality of scanning electrodes comprising a selection signal during a selection period and a non-selection signal during a non-selection period;
- and
- (b) applying a data signal to each of a plurality of signal electrodes based on display data to be displayed by the liquid crystal device;
- wherein step (a) further comprises the steps of:
- (1) grouping the plurality of scanning electrodes into p groups, each group comprising at least i scanning electrodes, wherein p and i are integers of at least two;
- (2) applying the selection signal substantially simultaneously to the at least i scanning electrodes in one of the p groups and applying the non-selection signal substantially simultaneously to the at least i scanning electrodes in the one of the p groups immediately after applying the selection signal thereto and selecting a level of the selection signal based on an orthogonal function, wherein the selection signal is sequentially applied to succeeding groups of the scanning electrodes, wherein the non-selection signal is sequentially applied to succeeding groups of the scanning electrode groups immediately after applying the selection signal thereto, wherein the scanning signal has N selection periods and N non-selection periods per frame, and wherein N is an integer of at least two, and applying the selection signal to each of the scanning electrodes in each of the N selection periods, and wherein the orthogonal function has information for determining a level of the selection signal, and
- wherein step (b) further comprises the step of:
- (1) determining the level of the data signal based on a relation between the display data and the level of the selection signal, and
- wherein in contiguous frames, at least one of the selection signals applied to the N selection periods has a substantially 180.degree. phase difference from at least one other one.
6 more elements
Dependencies are inferred from the claim text.