Display device and driving method thereof
First Claim
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 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.
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Accused Products
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.
72 Citations
34 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 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 (5, 9, 13, 17, 23)
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2. 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 AC transistor is stopped after the display device is mounted on an electronic appliance. - View Dependent Claims (6, 10, 14, 18, 24)
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3. 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 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 a 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 (7, 11, 15, 19, 21, 25)
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4. 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; and
a power source line, 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 power source line, and wherein the AC transistor is stopped after the display device is mounted on an electronic appliance. - View Dependent Claims (8, 12, 16, 20, 22, 26)
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27. 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 driver circuit for applying an AC signal to 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 (29, 32)
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28. 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 driver circuit for applying an AC signal to the light-emitting element;
a gate signal lin&
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a source signal line; and
a power source line, 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 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 (30, 31, 33)
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34. A method of manufacturing an electronic appliance comprising:
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providing a display panel, the display panel comprising;
a transistor formed over a substrate;
a first conductive layer electrically connected to the transistor and formed over the transistor;
an electroluminescent layer formed over the first conductive layer;
a second conductive layer formed over the electroluminescent layer;
a covering material formed over the second conductive layer;
performing an AC drive to the display panel; and
mounting the display panel which is performed the AC drive on the electronic appliance.
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Specification