EL display device and manufacturing method thereof

• US 20050029930A1
• Filed: 09/16/2004
• Published: 02/10/2005
• Est. Priority Date: 09/03/1999
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei
• Granted Patent: US 7,427,834 B2
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1251 comprising TFTs having a different architecture, e.g. top- and bottom gate TFTs
• CPC Class Codes: H01L 29/78621 with LDD structure or an extension or an offset region or characterised by the doping profile
• CPC Class Codes: H01L 29/78627 with a significant overlap between the lightly doped drain and the gate electrode, e.g. GOLDD
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/321 Inverted OLED, i.e. having cathode between substrate and anode
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 50/826 Multilayers, e.g. opaque multilayers
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/17 Passive-matrix OLED displays
• CPC Class Codes: H10K 59/805 Electrodes
• CPC Class Codes: H10K 59/80521 characterised by their shape
• CPC Class Codes: H10K 59/80523 Multilayers, e.g. opaque multilayers
• CPC Class Codes: H10K 59/877 comprising scattering means
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

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.

Claims

1-21. -21. (Canceled).

22. A display device comprising:

a substrate;

a light emitting layer provided over said substrate;

an anode provided over said light emitting layer;

an input wiring provided over said substrate for imparting a voltage to said anode; and

an insulating film provided over said input wiring,

wherein said anode is provided over said insulating film.

23. A device according to claim 22 further comprising a passivation film provided over said anode.

24. A device according to claim 22 wherein said display device is incorporated into one selected from the group consisting of a video camera, a digital camera, a goggle type display, a game machine, a car navigation system, a personal computer, a portable information terminal, a mobile computer, a portable telephone, an electronic book and an image playback device.

25. A device according to claim 22 wherein said light emitting layer comprises an organic light emitting layer.

26. A device according to claim 22 wherein said light emitting layer comprises an EL layer.

27. A display device comprising:

a substrate;

a source wiring provided over said substrate;

a light emitting layer provided over said substrate;

an anode provided over said light emitting layer;

an input wiring provided over said substrate for imparting a voltage to said anode and provided in a same layer as said source wiring; and

an insulating film provided over said input wiring,

wherein said anode is provided over said insulating film.

28. A device according to claim 27 further comprising a passivation film provided over said anode.

29. A device according to claim 27 wherein said display device is incorporated into one selected from the group consisting of a video camera, a digital camera, a goggle type display, a game machine, a car navigation system, a personal computer, a portable information terminal, a mobile computer, a portable telephone, an electronic book and an image playback device.

30. A device according to claim 27 wherein said light emitting layer comprises an organic light emitting layer.

31. A device according to claim 27 wherein said light emitting layer comprises an EL layer.

32. A display device comprising:

a substrate;

a drain wiring provided over said substrate;

a light emitting layer provided over said substrate;

an anode provided over said light emitting layer;

an input wiring provided over said substrate for imparting a voltage to said anode and provided in a same layer as said drain wiring; and

an insulating film provided over said input wiring,

wherein said anode is provided over said insulating film.

33. A device according to claim 32 further comprising a passivation film provided over said anode.

34. A device according to claim 32 wherein said display device is incorporated into one selected from the group consisting of a video camera, a digital camera, a goggle type display, a game machine, a car navigation system, a personal computer, a portable information terminal, mobile computer, a portable telephone, an electronic book and an image playback device.

35. A device according to claim 32 wherein said light emitting layer comprises an organic light emitting layer.

36. A device according to claim 32 wherein said light emitting layer comprises an EL layer.

37. A display device comprising:

a substrate;

a TFT provided over said substrate;

a cathode provided over said substrate and connected with one of a source region and a drain region of said TFT;

a light emitting layer provided over said cathode;

an anode provided over said light emitting layer;

an input wiring provided over said substrate for imparting a voltage to said anode; and

an insulating film provided over said input wiring,

wherein said anode is provided over said insulating film.

38. A device according to claim 37 further comprising a passivation film provided over said anode.

39. A device according to claim 37 wherein said display device is incorporated into one selected from the group consisting of a video camera, a digital camera, a goggle type display, a game machine, a car navigation system, a personal computer, a portable information terminal, a mobile computer, a portable telephone, an electronic book and an image playback device.

40. A device according to claim 37 wherein said light emitting layer comprises an organic light emitting layer.

41. A device according to claim 37 wherein said light emitting layer comprises an EL layer.