Display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei Yamazaki, Jun Koyama, Mitsuaki Osame, Mai Osada
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Abstract
The present invention is intended to suppress power consumption of an EL display. In accordance with the brightness of an image to be displayed in a pixel portion, the contrast of the image is determined whether to be inverted or not, and the number of bits of the digital video signal to be input into the pixel portion is reduced, and the magnitude of a current to flow through the EL element is allowed to be maintained at a constant level even when a temperature of an EL layer changes by providing the EL display with another EL element to be used for monitoring a temperature.
Claims21
A display device comprising:
- a transistor including a semiconductor region, a gate insulating film, a gate electrode, a source wiring and a drain wiring;
- an interlayer insulating film over the source wiring and the drain wiring;
- a pixel electrode over the interlayer insulating film, wherein the pixel electrode is electrically connected with one of the source wiring and the drain wiring;
- a first resin partly overlapping the pixel electrode;
- a second resin over the first resin;
- and
- an organic compound layer over the pixel electrode and the second resin.
A display device comprising:
- a transistor including a semiconductor region, a gate insulating film, a gate electrode, a source wiring and a drain wiring;
- an interlayer insulating film over the source wiring and the drain wiring;
- a pixel electrode over the interlayer insulating film, wherein the pixel electrode contains indium tin oxide, and is electrically connected with one of the source wiring and the drain wiring;
- a first resin partly overlapping the pixel electrode;
- a second resin over the first resin;
- and
- an organic compound layer over the pixel electrode and the second resin.
A display device comprising:
- a transistor including a semiconductor region, a gate insulating film, a gate electrode, a source wiring and a drain wiring;
- an interlayer insulating film over the source wiring and the drain wiring;
- a pixel electrode over the interlayer insulating film, wherein the pixel electrode contains indium tin oxide, and is electrically connected with one of the source wiring and the drain wiring;
- a first resin partly overlapping the pixel electrode;
- a second resin over the first resin;
- an organic compound layer over the pixel electrode and the second resin;
- and
- a cathode over the organic compound layer and the second resin, wherein the cathode contains Mg and Ag.
Dependencies are inferred from the claim text.