EL display device and manufacturing method thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei Yamazaki
Life of this patent
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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 electroluminescence display device comprising:
- a plurality of cathodes formed in a stripe shape;
- an electroluminescence layer formed over the plurality of cathodes;
- and
- a plurality of anodes formed in a stripe shape over the electroluminescence layer;
- wherein the plurality of cathodes and the plurality of anodes are arranged so as to be orthogonal to each other;
- wherein the surfaces of the plurality of cathodes on the sides closer to the electroluminescence layer have textured structures, each of said textured structures comprising projecting portions, and
- wherein a pitch between said projecting portions to 0.05 to 1 μm.
An electroluminescence display device comprising an electroluminescence element containing a cathode, an electroluminescence layer, and an anode, wherein the surface of the cathode on the side closer to the electroluminescence layer has a textured structure comprising projection portions, and wherein a pitch between said projecting portions is 0.05 to 1 μm.
An electroluminescence display device comprising an electroluminescence element containing a cathode, an electroluminescence layer, and an anode,
- wherein the electroluminescence element is electrically connected to a thin film resistor,
- wherein the surface of the cathode on the side closer to the electroluminescence layer has a textured structure comprising projecting portions, and
- wherein a pitch between said projecting portions is 0.05 to 1 μm.
A method of manufacturing an electroluminescence display device, comprising:
- a step of forming a first textured structure on a surface of an electrode;
- a step of forming a cathode over the electrode having the first textured structure to form a second textured structure comprising projecting portions on a surface of said cathode;
- a step of forming an electroluminescence layer over the cathode;
- and
- a step of forming an anode over the electroluminescence layer,
- wherein a pitch between said projecting portions of said second textured structure is 0.05 to 1 μm.
A method of manufacturing an electroluminescence display device, comprising:
- a step of forming a plurality of electrodes arranged in a stripe shape;
- a step of forming first textured structures on the plurality of electrodes;
- a step of forming a cathode over the plurality of electrodes on which the first textured structures are formed to form a second textured structure comprising projecting portions on a surface of said cathode;
- a step of forming an electroluminescence layer over the cathode;
- and
- a step of forming a plurality of anodes arranged in a stripe shape over the electroluminescence layer so as to be orthogonal to the plurality of electrodes arranged in the stripe shape,
- wherein a pitch between said projecting portions of said second textured structure is 0.05 to 1 μm.
A method of manufacturing an electroluminescence display device, comprising:
- a step of forming a thin film transistor;
- a step of forming a pixel electrode electrically connected to the thin film transistor;
- a step of forming a first textured structure on a surface of the pixel electrode;
- a step of forming a cathode over the pixel electrode on which the first textured structure is formed to form a second textured structure comprising projecting portions on a surface of said cathode;
- a step of forming an electroluminescence layer over the cathode;
- and
- a step of forming an anode over the electroluminescence layer,
- wherein a pitch between said projecting portions of said second textured structure is 0.05 to 1 μm.
Dependencies are inferred from the claim text.