LIGHT EMITTING DEVICE
First Claim
1. A light emitting device comprising:
- a first monitor element;
a second monitor element;
a monitor line electrically connected to the first monitor element and the second monitor element;
a first circuit for electrically interrupting a current supplied to the first monitor element in a case where anode potential of the first monitor element is lowered; and
a second circuit electronically connected to the second monitor element, wherein the first circuit is electorically connected to the second circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A display device in which characteristic change of an organic light emitting layer due to deterioration or temperature change can be detected to keep the constant luminance of a light emitting element is provided. A monitor region is provided in addition to a pixel portion for display. A plurality of monitor elements is arranged in the monitor region. A switching circuit is provided so as to prevent a large amount of current from flowing in a shorted monitor element among the plurality of monitor elements. As a result, by monitoring potential change between electrodes of the monitor element, the voltage or the current that is supplied to a light emitting element in the pixel portion for display can be corrected in accordance with time degradation or temperature change.
18 Citations
12 Claims
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1. A light emitting device comprising:
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a first monitor element;
a second monitor element;
a monitor line electrically connected to the first monitor element and the second monitor element;
a first circuit for electrically interrupting a current supplied to the first monitor element in a case where anode potential of the first monitor element is lowered; and
a second circuit electronically connected to the second monitor element, wherein the first circuit is electorically connected to the second circuit. - View Dependent Claims (7)
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2. A light emitting device comprising:
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a first monitor element;
a second monitor element;
a monitor line electrically connected to the first monitor element and the second monitor element;
a first control transistor for controlling supply of a current from the monitor line to the first monitor element;
a second control transistor for controlling supply of a current from the monitor line to the second monitor element;
a first circuit for turning off the first control transistor in a case where anode potential of the first monitor element is lowered; and
a second circuit for turning on the second control transistor in a case where anode potential of the first monitor element is lowered. - View Dependent Claims (8)
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3. A light emitting device comprising:
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a first monitor element;
a second monitor element;
a monitor line electrically connected to the first monitor element and the second monitor element;
a unit for supplying a constant current to the monitor line;
a first control transistor for controlling supply of a current from the monitor line to the first monitor element;
a second control transistor for controlling supply of a current from the monitor line to the second monitor element;
a first circuit for turning off the first control transistor in a case where anode potential of the first monitor element is lowered; and
a second circuit for turning on the second control transistor in a case where anode potential of the first monitor element is lowered. - View Dependent Claims (9)
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4. A light emitting device comprising:
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a first monitor element;
a second monitor element that is paired with the first monitor element;
a monitor line electrically connected to the first monitor element and the second monitor element; and
a circuit for electrically interrupting a current supplied to the first monitor element and turning on the second monitor element in a case where anode potential of the first monitor element is lowered. - View Dependent Claims (10)
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5. A light emitting device comprising:
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a first monitor element;
a second monitor element that is paired with the first monitor element;
a monitor line electrically connected to the first monitor element and the second monitor element;
a first control transistor for controlling supply of a current from the monitor line to the first monitor element;
a second control transistor for controlling supply of a current from the monitor line to the second monitor element; and
a circuit for electrically interrupting the current supplied to the first monitor element and turning on the second monitor element in a case where anode potential of the first monitor element is lowered. - View Dependent Claims (11)
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6. A light emitting device comprising:
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a first monitor element;
a second monitor element that is paired with the first monitor element;
a monitor line electrically connected to the first monitor element and the second monitor element;
a unit for supplying a constant current to the monitor line;
a first control transistor for controlling supply of the current from the monitor line to the first monitor element;
a second control transistor for controlling supply of the current from the monitor line to the second monitor element;
a first circuit for turning off the first control transistor in a case where anode potential of the first monitor element is lowered; and
a second circuit to which potential of one of electrodes of the second monitor element and one of electrodes of the second control transistor is inputted and for outputting a potential to a gate electrode of the second control transistor, wherein the second circuit has a function for turning on the second monitor element in a case where the anode potential of the first monitor element is lowered. - View Dependent Claims (12)
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Specification