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US 12,372,838 B2Granted
Liquid crystal display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
Estimating the term…
Abstract
To improve viewing angle characteristics by varying voltage which is applied between liquid crystal elements. A liquid crystal display device in which one pixel is provided with three or more liquid crystal elements and the level of voltage which is applied is varied between the liquid crystal elements is varied. In order to vary the level of the voltage which is applied between the liquid crystal elements, an element which divides the applied voltage is provided. In order to vary the level of the applied voltage, a capacitor, a resistor, a transistor, or the like is used. Viewing angle characteristics can be improved by varying the level of the voltage which is applied between the liquid crystal elements.
Claims13
A display device comprising:
- pixels arranged in matrix;
- and
- first to third wirings,
- wherein one of the pixels comprises a first transistor, a second transistor, a first liquid crystal element, and a second liquid crystal element,
- wherein a first potential is supplied to a first pixel electrode of the first liquid crystal element from the first wiring through the first transistor,
- wherein a second potential is supplied to a second pixel electrode of the second liquid crystal element by establishing electrical continuity between the first wiring and the second wiring through the second transistor,
- wherein the first potential is different from the second potential,
- wherein the first wiring is shared with the pixels in a first column,
- wherein the second wiring is shared with the pixels in the first column,
- wherein a ratio of a channel width to a channel length of the first transistor is larger than a ratio of a channel width to a channel length of the second transistor,
- wherein a potential of a gate electrode of the first transistor and a potential of a gate electrode of the second transistor are controlled by the third wiring, and
- wherein the display device is a transmissive liquid crystal display device.
9 more elements
A display device comprising:
- pixels arranged in matrix;
- and
- first to third wirings,
- wherein one of the pixels comprises a first transistor, a second transistor, a first liquid crystal element, and a second liquid crystal element,
- wherein a first potential is supplied to a first pixel electrode of the first liquid crystal element from the first wiring through the first transistor,
- wherein a second potential is supplied to a second pixel electrode of the second liquid crystal element by establishing electrical continuity between the first wiring and the second wiring through the second transistor,
- wherein the first potential is different from the second potential,
- wherein the first wiring is shared with the pixels in a first column,
- wherein the second wiring is shared with the pixels in the first column,
- wherein, in the first transistor, one of a source electrode and a drain electrode comprises a region located between regions of the other of the source electrode and the drain electrode in a plan view,
- wherein, in the second transistor, one of a source electrode and a drain electrode does not comprise a region located between regions of the other of the source electrode and the drain electrode in the plan view,
- wherein a potential of a gate electrode of the first transistor and a potential of a gate electrode of the second transistor are controlled by the third wiring, and
- wherein the display device is a transmissive liquid crystal display device.
10 more elements
A display device comprising:
- pixels arranged in matrix;
- and
- first to third wirings,
- wherein one of the pixels comprises a first transistor, a second transistor, a first liquid crystal element, and a second liquid crystal element,
- wherein a first potential is supplied to a first pixel electrode of the first liquid crystal element from the first wiring through the first transistor,
- wherein a second potential is supplied to a second pixel electrode of the second liquid crystal element by establishing electrical continuity between the first wiring and the second wiring through the second transistor,
- wherein the first potential is different from the second potential,
- wherein the first wiring is shared with the pixels in a first column,
- wherein the second wiring is shared with the pixels in the first column,
- wherein, in the first transistor, one of a source electrode and a drain electrode comprises a region located between regions of the other of the source electrode and the drain electrode in a plan view,
- wherein, in the second transistor, one of a source electrode and a drain electrode does not comprise a region located between regions of the other of the source electrode and the drain electrode in the plan view,
- wherein a ratio of a channel width to a channel length of the first transistor is larger than a ratio of a channel width to a channel length of the second transistor,
- wherein a potential of a gate electrode of the first transistor and a potential of a gate electrode of the second transistor are controlled by the third wiring, and
- wherein the display device is a transmissive liquid crystal display device.
11 more elements
A display device comprising:
- pixels arranged in matrix;
- and
- first to third wirings,
- wherein one of the pixels comprises a first transistor, a second transistor, a third transistor, a first liquid crystal element, and a second liquid crystal element,
- wherein a first potential corresponding to a signal potential is supplied to a first pixel electrode of the first liquid crystal element from the first wiring through the first transistor,
- wherein a second potential is supplied to a second pixel electrode of the second liquid crystal element by turning on the second transistor and the third transistor and establishing electrical continuity between the first wiring and the second wiring through the second transistor and the third transistor,
- wherein the first potential is different from the second potential,
- wherein one of a source electrode and a drain electrode of the second transistor is directly connected to the second pixel electrode,
- wherein the first wiring is shared with the pixels in a first column,
- wherein the second wiring is shared with the pixels in the first column,
- wherein a ratio of a channel width to a channel length of the first transistor is larger than a ratio of a channel width to a channel length of the second transistor,
- wherein a ratio of a channel width to a channel length of the third transistor is larger than the ratio of the channel width to the channel length of the second transistor,
- wherein a potential of a gate electrode of the first transistor, a potential of a gate electrode of the second transistor, and a potential of a gate electrode of the third transistor are controlled by the third wiring, and
- wherein the display device is a transmissive liquid crystal display device.
11 more elements
A display device comprising:
- pixels arranged in matrix;
- and
- first to third wirings,
- wherein one of the pixels comprises a first transistor, a second transistor, a third transistor, a first liquid crystal element, and a second liquid crystal element,
- wherein a first potential corresponding to a signal potential is supplied to a first pixel electrode of the first liquid crystal element from the first wiring through the first transistor,
- wherein a second potential is supplied to a second pixel electrode of the second liquid crystal element by turning on the second transistor and the third transistor and establishing electrical continuity between the first wiring and the second wiring through the second transistor and the third transistor,
- wherein the first potential is different from the second potential,
- wherein one of a source electrode and a drain electrode of the second transistor is directly connected to the second pixel electrode,
- wherein the first wiring is shared with the pixels in a first column,
- wherein the second wiring is shared with the pixels in the first column,
- wherein, in the first transistor, one of a source electrode and a drain electrode comprises a region located between regions of the other of the source electrode and the drain electrode in a plan view,
- wherein, in the second transistor, the one of the source electrode and the drain electrode does not comprise a region located between regions of the other of the source electrode and the drain electrode in the plan view,
- wherein, in the third transistor, one of a source electrode and a drain electrode comprises a region located between regions of the other of the source electrode and the drain electrode in the plan view,
- wherein a ratio of a channel width to a channel length of the first transistor is larger than a ratio of a channel width to a channel length of the second transistor,
- wherein a ratio of a channel width to a channel length of the third transistor is larger than the ratio of the channel width to the channel length of the second transistor,
- wherein a potential of a gate electrode of the first transistor, a potential of a gate electrode of the second transistor, and a potential of a gate electrode of the third transistor are controlled by the third wiring, and
- wherein the display device is a transmissive liquid crystal display device.
14 more elements
Dependencies are inferred from the claim text.