Semiconductor device and method for manufacturing the same
First Claim
1. A light emitting device comprising:
- a substrate having an insulating surface;
a semiconductor layer of a thin film transistor over the substrate;
a first electrode directly connected to the semiconductor layer;
an insulator covering an end portion of the first electrode;
a buffer layer over the first electrode;
a layer containing an organic compound over the buffer layer; and
a second electrode over the layer containing an organic compound, wherein the first electrode has a first region and a second region having a different number of layers from the first region, a step is formed between the first region and the second region, and the step is covered with the insulator.
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Abstract
A manufacturing method of an active matrix light emitting device in which the active matrix light emitting device can be manufactured in a shorter time with high yield at low cost compared with conventional ones will be provided. It is a feature of the present invention that a layered structure is employed for a metal electrode which is formed in contact with or is electrically connected to a semiconductor layer of each TFT arranged in a pixel area of an active matrix light emitting device. Further, the metal electrode is partially etched and used as a first electrode of a light emitting element. A buffer layer, a layer containing an organic compound, and a second electrode layer are stacked over the first electrode.
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Citations
34 Claims
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1. A light emitting device comprising:
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a substrate having an insulating surface;
a semiconductor layer of a thin film transistor over the substrate;
a first electrode directly connected to the semiconductor layer;
an insulator covering an end portion of the first electrode;
a buffer layer over the first electrode;
a layer containing an organic compound over the buffer layer; and
a second electrode over the layer containing an organic compound, wherein the first electrode has a first region and a second region having a different number of layers from the first region, a step is formed between the first region and the second region, and the step is covered with the insulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A light emitting device comprising:
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a substrate having an insulating surface;
a semiconductor layer of a thin film transistor over the substrate;
a first electrode electrically connected to the semiconductor layer;
an insulator covering an end portion of the first electrode;
a buffer layer over the first electrode;
a layer containing an organic compound over the buffer layer; and
a second electrode over the layer containing an organic compound, wherein the first electrode has a first region and a second region having different number of layers from the first region, a step is formed between the first region and the second region, and the step is covered with the insulator. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for manufacturing a light emitting device including a plurality of light emitting elements comprising the steps of:
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forming a semiconductor layer of a thin film transistor;
forming an insulating film covering the semiconductor layer of the thin film transistor;
forming an electrode formed with a stack of metal layers in contact with the semiconductor layer of the thin film transistor, over the insulating film;
removing a part of the stack of the electrode to form a first electrode including a first region, a second region having more layers than the first region, and a step between the first region and the second region;
forming an insulator covering the step and the second region of the first electrode;
forming a buffer layer in contact with the first region;
forming a layer containing an organic compound over the buffer layer; and
forming a second electrode which transmits light over the layer containing an organic compound. - View Dependent Claims (27, 28, 29)
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30. A method for manufacturing a light emitting device including a plurality of light emitting elements comprising the steps of:
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forming a semiconductor layer of a thin film transistor;
forming an insulating film covering the semiconductor layer of the thin film transistor;
forming an electrode formed with a stack of metal layers in contact with the semiconductor layer of the thin film transistor, over the insulating film;
removing a part of the stack of the electrode to form a first electrode including a first region, a second region having more layers than the first region, and a step between the first region and the second region;
forming an insulator covering the step and the second region of the first electrode;
forming a buffer layer in contact with the first region by moving the substrate in a film formation chamber while moving a first evaporation source in a direction perpendicular to the moving direction of the substrate;
forming a layer containing an organic compound over the buffer layer by moving the substrate in the film formation chamber while moving a second evaporation source in a direction perpendicular to the moving direction of the substrate; and
forming the second electrode which transmits light over the layer containing an organic compound.
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31. A method for manufacturing a light emitting device including a plurality of light emitting elements comprising the steps of:
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forming a first electrode over a substrate having an insulating surface;
forming a layer containing an organic compound over the first electrode by moving the substrate in a film formation chamber while moving an evaporation source in a direction perpendicular to the moving direction of the substrate; and
forming a second electrode over the layer containing an organic compound.
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32. A deposition apparatus comprising:
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means for moving a substrate in a first direction in a film formation chamber;
a deposition shield which can control heating temperature, which is fixed to an internal wall of the film formation chamber;
an evaporation source under the deposition shield; and
means for moving the evaporation source in a second direction perpendicular to the first direction, wherein the deposition shield has a rectangular shape having a wider width than the substrate, a plurality of openings are provided on a top surface of the deposition shield, and a deposition material evaporated from the evaporation source is deposited to the substrate through the plurality of openings provided on the deposition shield. - View Dependent Claims (33, 34)
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Specification