EL display device and a method of manufacturing the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei Yamazaki
Life of this patent
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Abstract
To decrease the number of layers while keeping or improving the performance of an EL element, so that the production cost is reduced. Cathodes (106, 107), a light emitting layer (108), an anode (109), and a passivation film (110) are formed on pixel electrodes (104, 105). Thereafter, the vicinity of the interface between the light emitting layer (108) and the anode (109) are doped with a halogen element through the passivation film (110) and the anode (109). This leads to formation of a hole conveying region (111) that functions as a hole conveying layer, thereby enhancing the light emission efficiency.
Claims50
An EL display device comprising:
- a light emitting layer sandwiched between a cathode and an anode;and
- a passivation film formed on said anode,
- wherein a halogen element is contained in vicinities of an interface between said light emitting layer and said anode.
An EL display device comprising:
- a TFT formed over a substrate;
- a light emitting layer sandwiched between an anode and a cathode, said cathod electrically connected to said TFT;
- and
- a passivation film is formed on said anode,
- wherein a halogen element is contained in vicinities of an interface between said light emitting layer and said anode.
An EL display device comprising:
- a light emitting layer sandwiched between a cathode and an anode;
- and
- a passivation film formed on said anode, and
- wherein an alkali metal element or an alkaline earth metal element is contained in vicinities of an interface between said light emitting layer and said cathode.
An EL display device comprising:
- a TFT formed over a substrate;
- a light emitting layer sandwiched between an anode and a cathode, said cathode electrically connected to said TFT;
- and
- a passivation film is formed on said anode,
- wherein an alkali metal element or an alkaline earth metal element is contained in vicinities of an interface between said light emitting layer and said cathode.
A method of manufacturing an EL display device, comprising the steps of:
- forming a cathode;
- forming a light emitting layer on said cathode;
- forming an anode on said light emitting layer;
- forming a passivation film on said anode;
- and
- doping said light emitting layer with a halogen element through said passivation film.
A method of manufacturing an EL display device, comprising the steps of:
- forming a TFT over a substrate;
- forming a cathode that is electrically connected to said TFT;
- forming a light emitting layer on said cathode;
- forming an anode on said light emitting layer;
- forming a passivation film on said anode;
- and
- doping said light emitting layer with a halogen element through said passivation film.
A method of manufacturing an EL display device, comprising the steps of:
- forming a cathode;
- forming a light emitting layer on said cathode;
- forming an anode on said light emitting layer;
- forming a passivation film on said anode;
- selectively forming a resist on said passivation film;
- and
- doping said light emitting layer with a halogen element through said passivation film using said resist as a mask.
A method of manufacturing an EL display device, comprising the steps of:
- forming a cathode;
- forming a light emitting layer on said cathode;
- forming an anode on said light emitting layer;
- forming a passivation film on said anode;
- and
- doping said light emitting layer with an alkali metal element or an alkaline earth metal element through said passivation film.
A method of manufacturing an EL display device, comprising the steps of:
- forming a TFT over a substrate;
- forming a cathode that is electrically connected to said TFT;
- forming a light emitting layer on said cathode;
- forming an anode on said light emitting layer;
- forming a passivation film on said anode;
- and
- doping said light emitting layer with an alkali metal element or an alkaline earth metal element through said passivation film.
A method of manufacturing an EL display device, comprising the steps of:
- forming a cathode;
- forming a light emitting layer on said cathode;
- forming an anode on said light emitting layer;
- forming a passivation film on said anode;
- selectively forming a resist on said passivation film;
- and
- doping said light emitting layer with an alkali metal element or an alkaline earth metal element through said passivation film using said resist as a mask to dope.
Dependencies are inferred from the claim text.