LIGHT EMITTING DEVICE AND ELECTRONIC APPARATUS
First Claim
Patent Images
1. A light emitting device for displaying an image by dividing one frame into a plurality of subframes, comprising:
- a current source;
a first wire;
a second wire;
a third wire;
a fourth wire;
a first light emitting element;
a second light emitting element;
a first transistor including a source and a drain one of which is electrically connected to the second wire and the other is electrically connected to one electrode of the second light emitting element;
a second transistor including a source and a drain one of which is electrically connected to a gate of the first transistor and the other is electrically connected to the third wire, and a gate that is electrically connected to the fourth wire;
a circuit for supplying current from the current source to the first light emitting element through the first wire;
a circuit for supplying a potential generated using a potential of the first wire to the second wire; and
a circuit for selecting the fourth wire more than once in any one of the plurality of subframes.
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Accused Products
Abstract
To solve degradation with time of a light emitting element by a new method. When the potential of an electrode of a monitor pixel is sampled and fed back to a light emitting pixel, degradation with time of a light emitting element can be corrected. In addition, when a writing period is divided into a plurality of periods during which a plurality of rows are selected, a gray scale can be expressed by a weighted light emitting period. That is to say, a light emitting device of the invention has a plurality of monitoring light emitting elements, a monitor line for monitoring changes in the potentials of electrodes of the plurality of light emitting elements, and a means for preventing, when any one of the plurality of monitoring light emitting elements is short-circuited, a current from flowing to the short-circuited monitoring light emitting element through the monitor line.
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Citations
34 Claims
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1. A light emitting device for displaying an image by dividing one frame into a plurality of subframes, comprising:
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a current source;
a first wire;
a second wire;
a third wire;
a fourth wire;
a first light emitting element;
a second light emitting element;
a first transistor including a source and a drain one of which is electrically connected to the second wire and the other is electrically connected to one electrode of the second light emitting element;
a second transistor including a source and a drain one of which is electrically connected to a gate of the first transistor and the other is electrically connected to the third wire, and a gate that is electrically connected to the fourth wire;
a circuit for supplying current from the current source to the first light emitting element through the first wire;
a circuit for supplying a potential generated using a potential of the first wire to the second wire; and
a circuit for selecting the fourth wire more than once in any one of the plurality of subframes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light emitting device for displaying an image by dividing one frame into a plurality of subframes, comprising:
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a current source;
a first wire;
a second wire;
a third wire;
a fourth wire;
a first light emitting element;
a second light emitting element;
a first transistor including a source and a drain one of which is electrically connected to the second wire and the other is electrically connected to one electrode of the second light emitting element;
a second transistor including a source and a drain one of which is electrically connected to a gate of the first transistor and the other is electrically connected to the third wire, and a gate that is electrically connected to the fourth wire;
a circuit for supplying current from the current source to the first light emitting element through the first wire;
a circuit for interrupting current supply to the first light emitting element when one electrode of the first light emitting element is short-circuited to the other electrode thereof;
a circuit for supplying a potential generated using a potential of the first wire to the second wire; and
a circuit for selecting the fourth wire more than once in any one of the plurality of subframes. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A light emitting device for displaying an image by dividing one frame into a plurality of subframes, comprising:
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a current source;
a first wire;
a second wire;
a third wire;
a fourth wire;
a first light emitting element;
a second light emitting element;
a third transistor including a source and a drain one of which is electrically connected to the first wire and the other is electrically connected to one electrode of the first light emitting element;
a first transistor including a source and a drain one of which is electrically connected to the second wire and the other is electrically connected to one electrode of the second light emitting element;
a second transistor including a source and a drain one of which is electrically connected to a gate of the first transistor and the other is electrically connected to the third wire, and a gate that is electrically connected to the fourth wire;
a circuit for turning the third transistor off when one electrode of the first light emitting element is short-circuited to the other electrode thereof;
a circuit for supplying a potential generated using a potential of the first wire to the second wire; and
a circuit for selecting the fourth wire more than once in any one of the plurality of subframes, wherein the first emitting element is electrically connected to the current source through at least the first wire and the third transistor. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A light emitting device for displaying an image by dividing one frame into a plurality of subframes, comprising:
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a current source;
a first wire;
a second wire;
a third wire;
a fourth wire;
a first light emitting element;
a second light emitting element;
a third transistor including a source and a drain one of which is electrically connected to the first wire and the other is electrically connected to one electrode of the first light emitting element;
an inverter including an input terminal that is electrically connected to the other of the source and the drain of the third transistor and an output terminal that is electrically connected to a gate of the third transistor;
a first transistor including a source and a drain one of which is electrically connected to the second wire and the other is electrically connected to one electrode of the second light emitting element;
a second transistor including a source and a drain one of which is electrically connected to a gate of the first transistor and the other is electrically connected to the third wire, and a gate that is electrically connected to the fourth wire;
a circuit for supplying a potential generated using a potential of the first wire to the second wire; and
a circuit for selecting the fourth wire more than once in any one of the plurality of subframes, wherein the first emitting element is electrically connected to the current source through at least the first wire and the third transistor. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsYAMAZAKI, Shunpei
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current345/82
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CPC Class CodesG09G 2300/0819 used for counteracting unde...G09G 2320/029 by monitoring one or more p...G09G 2320/043 Preventing or counteracting...G09G 2320/045 Compensation of drifts in t...G09G 3/3233 with pixel circuitry contro...
