Display device and electronic device
First Claim
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1. A display device comprising:
- a pixel portion comprising;
a first pixel electrically connected to a first source signal line and a first gate signal line;
a second pixel electrically connected to a second source signal line and the first gate signal line;
a third pixel electrically connected to the first source signal line and a second gate signal line; and
a fourth pixel electrically connected to the second source signal line and the second gate signal line;
a first amplifier;
a second amplifier;
a first element; and
a second element,wherein each of the first pixel, the second pixel, the third pixel and the fourth pixel comprises a first transistor, a second transistor and a light emitting element;
wherein a gate of the first transistor of the first pixel is electrically connected to the first gate signal line,wherein a gate of the first transistor of the second pixel is electrically connected to the first gate signal line,wherein a gate of the first transistor of the third pixel is electrically connected to the second gate signal line,wherein a gate of the first transistor of the fourth pixel is electrically connected to the second gate signal line,wherein one of a source and a drain of the first transistor of the first pixel is electrically connected to the first source signal line,wherein one of a source and a drain of the first transistor of the second pixel is electrically connected to the second source signal line,wherein one of a source and a drain of the first transistor of the third pixel is electrically connected to the first source signal line,wherein one of a source and a drain of the first transistor of the fourth pixel is electrically connected to the second source signal line,wherein the other of the source and the drain of the first transistor of the first pixel is electrically connected to a gate of the second transistor of the first pixel,wherein the other of the source and the drain of the first transistor of the second pixel is electrically connected to a gate of the second transistor of the second pixel,wherein the other of the source and the drain of the first transistor of the third pixel is electrically connected to a gate of the second transistor of the third pixel,wherein the other of the source and the drain of the first transistor of the fourth pixel is electrically connected to a gate of the second transistor of the fourth pixel,wherein one of a source and a drain of the second transistor of the first pixel is electrically connected to the light emitting element of the first pixel,wherein one of a source and a drain of the second transistor of the second pixel is electrically connected to the light emitting element of the second pixel,wherein one of a source and a drain of the second transistor of the third pixel is electrically connected to the light emitting element of the third pixel,wherein one of a source and a drain of the second transistor of the fourth pixel is electrically connected to the light emitting element of the fourth pixel,wherein the other of the source and the drain of the second transistor of the first pixel is electrically connected to a first power source line,wherein the other of the source and the drain of the second transistor of the second pixel is electrically connected to the first power source line,wherein the other of the source and the drain of the second transistor of the third pixel is electrically connected to a second power source line,wherein the other of the source and the drain of the second transistor of the fourth pixel is electrically connected to the second power source line,wherein the first amplifier is electrically connected to the first power source line,wherein the second amplifier is electrically connected to the second power source line,wherein each of the first element and the second element comprises the same materials as the light emitting element,wherein the light emitting element of the first pixel, the light emitting element of the second pixel and the first element are arranged in a direction parallel to the first gate signal line, andwherein the light emitting element of the third pixel, the light emitting element of the fourth pixel and the second element are arranged in a direction parallel to the second gate signal line.
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Abstract
A display device suppresses the influence of variations of a current value supplied to a light emitting element caused by a temperature change. In particular, luminance variations caused by a temperature gradient in a pixel portion due to a heat generated from a source signal line driver circuit are suppressed. In a display device including a gate signal line provided in a row direction, a source signal line provided in a column direction, and a light emitting element in a pixel portion arranged in matrix corresponding to the gate signal line and the source signal line, a column of monitor elements is provided beside the pixel portion, a constant current is supplied to each row of the monitor elements, and a voltage generated at the monitor element for each row of pixels is applied to light emitting elements of the corresponding row.
89 Citations
12 Claims
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1. A display device comprising:
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a pixel portion comprising; a first pixel electrically connected to a first source signal line and a first gate signal line; a second pixel electrically connected to a second source signal line and the first gate signal line; a third pixel electrically connected to the first source signal line and a second gate signal line; and a fourth pixel electrically connected to the second source signal line and the second gate signal line; a first amplifier; a second amplifier; a first element; and a second element, wherein each of the first pixel, the second pixel, the third pixel and the fourth pixel comprises a first transistor, a second transistor and a light emitting element; wherein a gate of the first transistor of the first pixel is electrically connected to the first gate signal line, wherein a gate of the first transistor of the second pixel is electrically connected to the first gate signal line, wherein a gate of the first transistor of the third pixel is electrically connected to the second gate signal line, wherein a gate of the first transistor of the fourth pixel is electrically connected to the second gate signal line, wherein one of a source and a drain of the first transistor of the first pixel is electrically connected to the first source signal line, wherein one of a source and a drain of the first transistor of the second pixel is electrically connected to the second source signal line, wherein one of a source and a drain of the first transistor of the third pixel is electrically connected to the first source signal line, wherein one of a source and a drain of the first transistor of the fourth pixel is electrically connected to the second source signal line, wherein the other of the source and the drain of the first transistor of the first pixel is electrically connected to a gate of the second transistor of the first pixel, wherein the other of the source and the drain of the first transistor of the second pixel is electrically connected to a gate of the second transistor of the second pixel, wherein the other of the source and the drain of the first transistor of the third pixel is electrically connected to a gate of the second transistor of the third pixel, wherein the other of the source and the drain of the first transistor of the fourth pixel is electrically connected to a gate of the second transistor of the fourth pixel, wherein one of a source and a drain of the second transistor of the first pixel is electrically connected to the light emitting element of the first pixel, wherein one of a source and a drain of the second transistor of the second pixel is electrically connected to the light emitting element of the second pixel, wherein one of a source and a drain of the second transistor of the third pixel is electrically connected to the light emitting element of the third pixel, wherein one of a source and a drain of the second transistor of the fourth pixel is electrically connected to the light emitting element of the fourth pixel, wherein the other of the source and the drain of the second transistor of the first pixel is electrically connected to a first power source line, wherein the other of the source and the drain of the second transistor of the second pixel is electrically connected to the first power source line, wherein the other of the source and the drain of the second transistor of the third pixel is electrically connected to a second power source line, wherein the other of the source and the drain of the second transistor of the fourth pixel is electrically connected to the second power source line, wherein the first amplifier is electrically connected to the first power source line, wherein the second amplifier is electrically connected to the second power source line, wherein each of the first element and the second element comprises the same materials as the light emitting element, wherein the light emitting element of the first pixel, the light emitting element of the second pixel and the first element are arranged in a direction parallel to the first gate signal line, and wherein the light emitting element of the third pixel, the light emitting element of the fourth pixel and the second element are arranged in a direction parallel to the second gate signal line. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device comprising:
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a pixel portion comprising; a first pixel electrically connected to a first line and a second line; and a second pixel electrically connected to a third line and the second line; a third pixel electrically connected to the first line and a fourth line; and a fourth pixel electrically connected to the third line and the fourth line; a first amplifier; a second amplifier; a first element; and a second element, wherein each of the first pixel, the second pixel, the third pixel and the fourth pixel comprises a first transistor, a second transistor and a light emitting element; wherein a gate of the first transistor of the first pixel is electrically connected to the second line, wherein a gate of the first transistor of the second pixel is electrically connected to the second line, wherein a gate of the first transistor of the third pixel is electrically connected to the fourth line, wherein a gate of the first transistor of the fourth pixel is electrically connected to the fourth line, wherein one of a source and a drain of the first transistor of the first pixel is electrically connected to the first line, wherein one of a source and a drain of the first transistor of the second pixel is electrically connected to the third line, wherein one of a source and a drain of the first transistor of the third pixel is electrically connected to the first line, wherein one of a source and a drain of the first transistor of the fourth pixel is electrically connected to the third line, wherein the other of the source and the drain of the first transistor of the first pixel is electrically connected to a gate of the second transistor of the first pixel, wherein the other of the source and the drain of the first transistor of the second pixel is electrically connected to a gate of the second transistor of the second pixel, wherein the other of the source and the drain of the first transistor of the third pixel is electrically connected to a gate of the second transistor of the third pixel, wherein the other of the source and the drain of the first transistor of the fourth pixel is electrically connected to a gate of the second transistor of the fourth pixel, wherein one of a source and a drain of the second transistor of the first pixel is electrically connected to the light emitting element of the first pixel, wherein one of a source and a drain of the second transistor of the second pixel is electrically connected to the light emitting element of the second pixel, wherein one of a source and a drain of the second transistor of the third pixel is electrically connected to the light emitting element of the third pixel, wherein one of a source and a drain of the second transistor of the fourth pixel is electrically connected to the light emitting element of the fourth pixel, wherein the other of the source and the drain of the second transistor of the first pixel is electrically connected to a fifth line, wherein the other of the source and the drain of the second transistor of the second pixel is electrically connected to the fifth line, wherein the other of the source and the drain of the second transistor of the third pixel is electrically connected to a sixth line, wherein the other of the source and the drain of the second transistor of the fourth pixel is electrically connected to the sixth line, wherein the first amplifier is electrically connected to the fifth line, wherein the second amplifier is electrically connected to the sixth line, wherein each of the first element and the second element comprises the same materials as the light emitting element, wherein the light emitting element of the first pixel, the light emitting element of the second pixel and the first element are arranged in a direction parallel to the second line, and wherein the light emitting element of the third pixel, the light emitting element of the fourth pixel and the second element are arranged in a direction parallel to the fourth line. - View Dependent Claims (8, 9, 10, 11, 12)
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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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InventorsKoyama, Jun, Yamazaki, Shunpei
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Primary Examiner(s)Amadiz, Rodney
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Application NumberUS13/484,489Publication NumberTime in Patent Office523 DaysField of Search345 76- 86, 345/204, 345/212, 345/690, 315168-1693, 315/307, 324/760.01US Class Current345/76CPC Class CodesG09G 2300/0842 forming a memory circuit, e...G09G 2310/0262 The addressing of the pixel...G09G 2310/061 for resetting or blankingG09G 2320/0223 Compensation for problems r...G09G 2320/0233 Improving the luminance or ...G09G 2320/029 by monitoring one or more p...G09G 2320/041 Temperature compensationG09G 2320/043 Preventing or counteracting...G09G 3/3216 using a passive matrixG09G 3/3233 with pixel circuitry contro...G09G 3/3266 Details of drivers for scan...G09G 3/3275 Details of drivers for data...
