Light emitting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei Yamazaki, Jun Koyama, Noriko Shibata
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Abstract
There is provided an active matrix type light emitting device which can be easily made multicolored. In a pixel portion of the light emitting device, a plurality of light emitting layers shared by a plurality of pixels are formed, so that a display of a plurality of colors becomes possible. Further, a preliminary region is provided in a region interposed between different light emitting layers, so that poor quality can be prevented from being produced due to a mask shift or the like at the time of formation of the light emitting layers. Further, a light emitting layer made of a triplet compound is used so that reduction in electric power can be realized.
Claims52
A light emitting device including an active matrix type light emitting device comprising:
- a pixel portion and a driving circuit portion on an insulating surface;
- a plurality of light emitting layers in the pixel portion;
- a plurality of EL elements sharing one of the plurality of light emitting layers in the pixel portion;
- and
- a region between two light emitting layers,
- wherein the region has thin film transistors and has no light emitting layer.
A light emitting device including an active matrix type light emitting device comprising:
- a pixel portion and a driving circuit portion on an insulating surface;
- a plurality of light emitting layers in the pixel portion;
- a plurality of EL elements sharing one of the plurality of light emitting layers in the pixel portion to form at least a display portion;
- and
- a region between two light emitting layers,
- wherein the region has thin film transistors and has no light emitting layer.
A light emitting device including an active matrix type light emitting device comprising:
- a pixel portion and a driving circuit portion on an insulating surface;
- a plurality of light emitting layers formed in series among a plurality of pixels in the pixel portion;
- and
- a region between two light emitting layers,
- wherein each of the plurality of pixels includes at least a thin film transistor, and
- wherein the region has thin film transistors and has no light emitting layer.
A light emitting device including an active matrix type light emitting device comprising:
- a pixel portion and a driving circuit portion on an insulating surface;
- a plurality of display portions in the pixel portion, with each display portion including a plurality of pixels and a light emitting layer;
- and
- a region between two light emitting layers,
- wherein one of the plurality of display portions having the same light emitting layer is formed in the plurality of pixels, and
- wherein the region has thin film transistors and has no light emitting layer.
Dependencies are inferred from the claim text.