Light emitting device
First Claim
Patent Images
1. A display device including a pixel portion, the pixel portion comprising:
- a first transistor including a channel formation region, a source, a drain, and a gate;
a first insulating film over the first transistor;
a conductive film over the first insulating film;
a second insulating film over the first wiring conductive film;
a pixel electrode over and in contact with the second insulating film; and
a first wiring over and in contact with the second insulating film,wherein the channel formation region includes a first region,wherein the gate includes a second region,wherein the conductive film includes a third region,wherein the first wiring includes a fourth region, andwherein the first region, the second region, the third region, and the fourth region overlap with one another.
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Abstract
A light emitting device is provided which can prevent a change in gate voltage due to leakage or other causes and at the same time can prevent the aperture ratio from lowering. A capacitor storage is formed from a connection wiring line, an insulating film, and a capacitance wiring line. The connection wiring line is formed over a gate electrode and an active layer of a TFT of a pixel, and is connected to the active layer. The insulating film is formed on the connection wiring line. The capacitance wiring line is formed on the insulating film. This structure enables the capacitor storage to overlap the TFT, thereby increasing the capacity of the capacitor storage while keeping the aperture ratio from lowering. Accordingly, a change in gate voltage due to leakage or other causes can be avoided to prevent a change in luminance of an OLED and flickering of screen in analog driving.
67 Citations
20 Claims
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1. A display device including a pixel portion, the pixel portion comprising:
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a first transistor including a channel formation region, a source, a drain, and a gate; a first insulating film over the first transistor; a conductive film over the first insulating film; a second insulating film over the first wiring conductive film; a pixel electrode over and in contact with the second insulating film; and a first wiring over and in contact with the second insulating film, wherein the channel formation region includes a first region, wherein the gate includes a second region, wherein the conductive film includes a third region, wherein the first wiring includes a fourth region, and wherein the first region, the second region, the third region, and the fourth region overlap with one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A display device including a pixel portion, the pixel portion comprising:
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a first transistor and a second transistor each including a channel formation region, a source, a drain, and a gate; a first insulating film over the first transistor and the second transistor; a first conductive film over the first insulating film; a second conductive film over the first insulating film; a second insulating film over the first conductive film and the second conductive film; a pixel electrode over and in contact with the second insulating film; a first wiring over and in contact with the second insulating film; and a second wiring electrically connected to the gate of the first transistor, the second wiring electrically connected to the gate of the second transistor, wherein the channel formation region of the first transistor includes a first region, wherein the gate of the first transistor includes a second region, wherein the first conductive film includes a third region, wherein the first wiring includes a fourth region, wherein the channel formation region of the second transistor includes a fifth region, wherein the gate of the second transistor includes a sixth region, wherein the second conductive film includes a seventh region, wherein the first wiring includes an eighth region, wherein the first region, the second region, the third region, and the fourth region overlap with one another, and wherein the fifth region, the sixth region, the seventh region, the eighth region overlap with one another. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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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, Koyama, Jun, Arao, Tatsuya, Azami, Munehiro
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Primary Examiner(s)Malsawma, Lex
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Application NumberUS14/614,502Publication NumberTime in Patent Office264 DaysField of SearchUS Class Current1/1CPC Class CodesH01L 27/124 with a particular compositi...H01L 27/1255 integrated with passive dev...H01L 29/78633 with a light shieldH10K 59/1213 the pixel elements being TFTsH10K 59/1216 the pixel elements being ca...H10K 59/122 Pixel-defining structures o...H10K 59/124 Insulating layers formed be...H10K 59/131 Interconnections, e.g. wiri...
