EL display device and manufacturing method thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei Yamazaki
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Abstract
Reducing the manufacturing cost of an EL display device and an electronic device furnished with the EL display device is taken as an objective. A textured structure in which projecting portions are formed on the surface, of a cathode is used. External stray light is diffusely (irregularly) reflected by the action of the projecting portions when reflected by the surface of the cathode, and therefore a defect in which the face of an observer or the surrounding scenery is reflected in the surface of the cathode can be prevented. This can be completed without using a conventionally necessary high price circular polarizing film, and therefore it is possible to reduce the cost of manufacturing the EL display device.
Claims21
An EL display device comprising an EL element containing a cathode, an EL layer, and an anode, wherein the surface of the cathode on the side closer to the EL layer has a textured structure.
An EL display device comprising:
- a plurality of cathodes formed in a stripe shape;
- an EL layer formed over the plurality of cathodes;
- and
- a plurality of anodes formed in a stripe shape over the EL layer;
- wherein:
- the plurality of cathodes and the plurality of anodes are arranged so as to be orthogonal to each other;
- and
- the surfaces of the plurality of cathodes on the sides closer to the EL layer have textured structures.
An EL display device comprising an EL element containing a cathode, an EL layer, and an anode,
- wherein the EL element is electrically connected to a TFT, and
- wherein the surface of the cathode on the side closer to the EL layer has a textured structure.
A method of manufacturing an EL display device, comprising:
- a step of forming a textured structure on a surface of an electrode;
- a step of forming a cathode over the electrode having the textured structure;
- a step of forming an EL layer over the cathode;
- and
- a step of forming an anode over the EL layer.
A method of manufacturing an EL display device, comprising:
- a step of forming a plurality of electrodes arranged in a stripe shape;
- a step of forming textured structures on the plurality of electrodes;
- a step of forming a cathode over the plurality of electrodes on which the textured structures are formed;
- a step of forming an EL layer over the cathode;
- and
- a step of forming a plurality of anodes arranged in a stripe shape over the EL layer so as to be orthogonal to the plurality of electrodes arranged in the stripe shape.
A method of manufacturing an EL display device, comprising:
- a step of forming a TFT;
- a step of forming a pixel electrode electrically connected to the TFT;
- a step of forming a textured structure on a surface of the pixel electrode;
- a step of forming a cathode over the pixel electrode on which the textured structure is formed;
- a step of forming an EL layer over the cathode;
- and
- a step of forming an anode over the EL layer.
Dependencies are inferred from the claim text.