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US 2006/0232218 A1Published application
Display device and electronic device using the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsMitsuaki OSAME, Taichi KATO
Life of this patent
Estimating the term…
Abstract
A display device with a compensation circuit that applies a fixed potential constantly to a gate electrode of a driving transistor for a certain period is provided. Specifically, each difference voltage value between an anode and a cathode of the light emitting element is utilized in the case where the light emitting element emits light and emits no light. In a case where the light emitting element emits light, a potential of the gate electrode of the driving transistor is to be held; and in a case where the light emitting element emits no light, a potential that certainly turns off the gate electrode of the driving transistor is kept on applying to the gate electrode of the driving transistor.
Claims50
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- and
- a circuit that controls conduction between a gate electrode of the second transistor and a power source line,
- wherein a gate electrode of the first transistor is electrically connected to a scanning line,
- wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to the gate electrode of the second transistor,
- whereinone one of a source electrode and a drain electrode of the second transistor is electrically connected to the power source line,
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode, and
- wherein a conduction state or a non-conduction state in the circuit is selected depending on a potential of the pixel electrode and a potential of the scanning line.
9 more elements
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- a circuit that controls conduction between a gate electrode of the second transistor and a power source line;
- and
- a controlling element that controls conduciotn between the gate electrode of the second transistor and a second scanning line,
- wherein a gate electrode of the first transistor is electrically connected to a first scaning line,
- wherein one of a source electrode and a drain electorde of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to the gate electrode of the second transistor,
- wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to the power source line,
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode,
- wherein a conduction state or a non-conduction state in the circuit is selected depending on a potential of the pixel electrode and a potential of the first scanning line;
- wherein the controlling element is to be in a conduciton state or a non-conduction state based on a potential of the second scanning line;
- and
- wherein a potential of the power source line and a potential of the second scanning line are held to turn off the second transistor.
13 more elements
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- a circuit that controls conduction between a gate electrode of the second transistor and a power source line;
- and
- a controlling element that controls conduction between the gate electrode of the second transistor and a second scanning line,
- wherein a gate electrode of the first transistor is electrically connected to a first scanning line,
- wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to the gate electrode of the second transistor,
- wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to the power source line,
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode,
- wherein a conduction state or a non-conduction state in the circuit is selected depending on a potential of the pixel electrode, a potential of the first scanning line, and a potential of the second scanning line,
- wherein the controlling element is to be in a conduction state or a non-conduction state based on a potential of the second scanning line, and
- wherein a potential of the power source line and a potential of the second scanning line are held to turn off the second transistor.
12 more elements
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- a circuit that controls conduction between a gate electrode of the second transistor and a power source line;
- and
- a controlling element that controls conduction between one of a source electrode and a drain electrode of the second transistor and the power source line,
- wherein a gate electrode in the first transistor is electrically connected to a first scanning line,
- wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to the gate electrode of the second transistor,
- wherein one of the source electrode and the drain electrode of the second transistor is electrically connected to the power source line through the controlling element,
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode,
- wherein a conduction state or a non-conduction state in the circuit is selected depending on a potential of the pixel electrode and a potential of the first scanning line, and
- wherein the controlling element is to be in a conduciotn state or a non-conduciotn state by a potential of the second scanning line.
11 more elements
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- a third transistor;
- and
- a fourth transistor,
- wherein a gate electrode of the first transistor is electrically connected to a scanning line,
- wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to a gate electrode of the second transistor and one of a source electrode and a drain electrode of the third transistor,
- wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to a power source line,
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode and a gate electrode of the third transistor,
- wherein the other of the source electrode and the drain electrode of the third transistor is electrically connected to one of a source electrode and a drain electrode of the fourth transistor,
- wherein a gate electrode of the fourth transistor is electrically connected to the scanning line, and
- wherein the other of the source electrode and the drain electrode of the fourth transistor is electrically connected to the power source line.
12 more elements
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- a third transistor;
- a fourth transistor;
- and
- a controlling element,
- wherein a gate electrode of the first transistor is electrically connected to a first scanning line,
- wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to a gate electrode of the second transistor, one of a source electrode and a drain electrode of the third transistor, and one of terminals of the controlling element,
- wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to a power source line,
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode and a gate electrode of the third transistor,
- wherein the other of the source electrode and the drain electrode of the third transistor is electrically connected to one of a source electrode and a drain electrode of the fourth electrode,
- wherein a gate electrode of the fourth transistor is electrically connected to the first scanning line,
- wherein the other of the source electrode and the drain electorde of the fourth electrode is electrically connected to the power source line,
- wherein the other terminal of the controlling element is connected to a second scanning line, and
- wherein a potential of the power source line and a potential of the second scanning line are held to turn off the second transistor.
15 more elements
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- a third transistor;
- a fourth transistor;
- a fifth transistor;
- and
- a controlling element,
- wherein a gate electrode of the first transistor is electrically connected to a first scanning line,
- wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to a gate electrode of the second transistor and one of a source electrode and a drain electrode of the third transistor,
- wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to a power source line;
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode, a gate electrode of the third transistor, and one of terminals of the controlling element,
- wherein the other of the source electrode and the draina second electrode of the third transistor is electrically connected to one of a source electrode and a drain electrode of the fourth transistor,
- wherein a gate electrode of the fourth transistor is electrically connected to the first scanning line,
- wherein the other of the source electrode and the drain electrode of the fourth transistor is electrically connected to one of a source electrode and a draina first electrode of the fifth electrode,
- wherein the other of the source electrode and the drain electrode of the fifth electrode is electrically connected to the power source line,
- wherein the other terminal in the controlling element is connected to a second scanning line, and
- wherein a potential of the power source line and a potential of the second scanning line are held to turn off the second transistor.
17 more elements
A display device comprising:
- a pixel comprising:
- a first transistor;
- a second transistor;
- a pixel electrode;
- a third transistor;
- a fourth transistor;
- and
- a fifth transistor,
- wherein a gate electrode of the first transistor is electrically connected to a first scanning line,
- wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a signal line,
- wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to a gate electrode of the second transistor and one of a source electrode and a drain electrode of the third transistor,
- wherein one of a source electrode and a draine electrode of the second transistor is electrically connected to one of a source electrode and a drain electrode of the fifth transistor,
- wherein the other of the source electrode and the drain electrode of the second transistor is electrically connected to the pixel electrode and a gate electrode of the third transistor,
- wherein the other of the source electrode and the drain electrode of the third transistor is electrically connected to one of a source electrode and a drain electrode of the fourth transistor,
- wherein a gate electrode of the fourth transistor is electrically connected to the first scanning line,
- wherein the other of the source electrode and the drain electrode of the fourth transistor is electrically connected to the power source line,
- wherein a gate electrode of the fifth transistor is electrically connected to a second scanning line, and
- wherein the other of the source electrode and the drain electrode of the fifth transistor is electrically connected to the power source line.
15 more elements
Dependencies are inferred from the claim text.