Liquid Crystal Display Device and Electronic Device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShuji Fukai, Ryo Hatsumi, Daisuke Kubota
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Abstract
A flicker of an FFS liquid crystal display device that is driven at a low refresh rate is reduced. In an FFS liquid crystal display, a pixel electrode and a first common electrode included in a liquid crystal element are formed on an element substrate side, and a second common electrode is formed on another substrate (counter substrate) side. By making the first and second common electrodes have the same potential, generation of a residual DC voltage can be suppressed in a pixel. Thus, even when a refresh rate is lowered, change in transmittance of a pixel can be suppressed in a data retention period, so that a flicker can be reduced.
Claims12
A liquid crystal display device comprising:
- a first substrate and a second substrate facing each other;
- a liquid crystal layer between the first substrate and the second substrate;
- a pixel electrode and a first common electrode between the first substrate and the liquid crystal layer;
- and
- a second common electrode between the second substrate and the liquid crystal layer,
- wherein the pixel electrode faces the first common electrode with an insulating layer between the pixel electrode and the first common electrode,
- wherein the second common electrode faces the first common electrode with the liquid crystal layer between the second common electrode and the first common electrode,
- wherein a data signal corresponding to image data is supplied to the pixel electrode, and
- wherein a same potential is supplied to the first common electrode and the second common electrode.
A liquid crystal display device comprising:
- a first substrate and a second substrate facing each other;
- a liquid crystal layer between the first substrate and the second substrate;
- a pixel;
- a gate line and a source line connected to the pixel;
- a gate driver that generates a gate signal and outputs the gate signal to the gate line;
- a source driver that generates a data signal and outputs the data signal to the source line;
- and
- a controller that controls the gate driver and the source driver,
- wherein the pixel comprises a transistor, a pixel electrode, and a first common electrode between the first substrate and the liquid crystal layer, and a second common electrode between the second substrate and the liquid crystal layer,
- wherein a gate of the transistor is electrically connected to the gate line, and the transistor is provided between the pixel electrode and the source line,
- wherein the pixel electrode faces the first common electrode with an insulating layer between the pixel electrode and the first common electrode,
- wherein the second common electrode faces the first common electrode with the liquid crystal layer between the second common electrode and the first common electrode,
- wherein the second common electrode is supplied with a potential that is the same as a potential supplied to the first common electrode, and
- wherein the controller has a control function of making the gate driver and the source driver retain a data signal that are input to the pixel for a longer period than one frame period.
Dependencies are inferred from the claim text.