Display device and driving method thereof
First Claim
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1. A display device comprising:
- a pixel comprising;
a light-emitting element;
a driving transistor;
an AC transistor;
a first path for supplying a forward current to the light-emitting element; and
a second path for supplying a reverse current to the light-emitting element,wherein the light-emitting element comprises a pixel electrode and an opposing electrode,wherein one of a source electrode and a drain electrode of the driving transistor is connected to the pixel electrode of the light-emitting element,wherein one of a source electrode and a drain electrode of the AC transistor is connected to the pixel electrode of the light-emitting element,wherein the driving transistor is disposed in the first path and the AC transistor is disposed in the second path,wherein switching between the first path and the second path is controlled by using the driving transistor and the AC transistor, andwherein the AC transistor is stopped after the display device is mounted on an electronic appliance.
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Abstract
A display device where a reverse driving voltage can be applied to a light-emitting element at regular intervals in order to insulate a short-circuit portion, thereby prolonging the life of the light-emitting element. A short-circuit portion is burnt out by providing a period for supplying a forward voltage or current to a light-emitting element, and a period for supplying a reverse voltage or current thereto. AC drive is performed only before mounting an AC driver circuit on an electronic appliance, and it is not performed after the mounting. Accordingly, the number of components in an electronic appliance can be reduced as well as the cost reduction of the components can be achieved.
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Citations
22 Claims
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1. A display device comprising:
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a pixel comprising; a light-emitting element; a driving transistor; an AC transistor; a first path for supplying a forward current to the light-emitting element; and a second path for supplying a reverse current to the light-emitting element, wherein the light-emitting element comprises a pixel electrode and an opposing electrode, wherein one of a source electrode and a drain electrode of the driving transistor is connected to the pixel electrode of the light-emitting element, wherein one of a source electrode and a drain electrode of the AC transistor is connected to the pixel electrode of the light-emitting element, wherein the driving transistor is disposed in the first path and the AC transistor is disposed in the second path, wherein switching between the first path and the second path is controlled by using the driving transistor and the AC transistor, and wherein the AC transistor is stopped after the display device is mounted on an electronic appliance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device comprising:
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a pixel comprising; a light-emitting element; a driving transistor for controlling the amount of a forward current flowing to the light-emitting element; a switching transistor for controlling input of a video signal; and an AC transistor for controlling a reverse current flowing to the light-emitting element, wherein the light-emitting element comprises a pixel electrode and an opposing electrode, wherein one of a source electrode and a drain electrode of the driving transistor is connected to the pixel electrode of the light-emitting element, wherein one of a source electrode and a drain electrode of the AC transistor is connected to the pixel electrode of the light-emitting element, and wherein the AC transistor is stopped after the display device is mounted on an electronic appliance. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A display device comprising:
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a pixel comprising; a light-emitting element; a driving transistor for controlling the amount of a forward current flowing to the light-emitting element; a switching transistor for controlling input of a video signal; an AC transistor for controlling a reverse current flowing to the light-emitting element; a gate signal line; a source signal line; a power source line; and a current lead-in line, wherein the light-emitting element comprises a pixel electrode and an opposing electrode, wherein one of a source electrode and a drain electrode of the driving transistor is connected to the pixel electrode of the light-emitting element, wherein one of a source electrode and a drain electrode of the AC transistor is connected to the pixel electrode of the light-emitting element, wherein a gate electrode of the switching transistor is connected to the gate signal line, wherein the switching transistor is connected to the source signal line and a gate electrode of the driving transistor, wherein the driving transistor is connected to the power source line and the light-emitting element, wherein a gate electrode of the AC transistor is connected to the power source line, wherein the AC transistor is connected to the light-emitting element and the current lead-in line, and wherein the AC transistor is stopped after the display device is mounted on an electronic appliance. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A display device comprising:
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a pixel comprising; a light-emitting element; a driving transistor for controlling the amount of a forward current flowing to the light-emitting element; an AC transistor; a switching transistor for controlling input of a video signal; and an AC driver circuit for applying an AC signal to the light-emitting element, wherein the light-emitting element comprises a pixel electrode and an opposing electrode, wherein one of a source electrode and a drain electrode of the driving transistor is connected to the pixel electrode of the light-emitting element, wherein one of a source electrode and a drain electrode of the AC transistor is connected to the pixel electrode of the light-emitting element, wherein the driving transistor operates in the linear region, and wherein the AC driver circuit is stopped after the display device is mounted on an electronic appliance. - View Dependent Claims (21, 22)
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Specification