EL display device

• US 6,894,312 B2
• Filed: 07/26/2002
• Issued: 05/17/2005
• Est. Priority Date: 09/17/1999
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Konuma, Toshimitsu, Yamazaki, Shunpei, Mizukami, Mayumi
• Primary Examiner(s): Nelms, David
• Assistant Examiner(s): Huynh, Andy
• Application Number:
  US10/206,018
• Publication Number:
  US 20020190257A1
• Time in Patent Office: 1,026 Days
• Field of Search: 257/13, 257/59, 257/72, 257/69, 257/79, 257 80- 86, 257 99-100, 257/103, 257/204, 257/274, 257/338, 257/368, 257/369, 257/449, 257/450, 257/451, 257452-457, 257/749, 257/918
• US Class Current: 257/72
• CPC Class Codes: H01L 27/1218 with a particular composition or structure of the substrate
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

Plurality of pixels (102) are arranged on the substrate. Each of the pixels (102) is provided with an EL element which utilizes as a cathode a pixel electrode (105) connected to a current control TFT (104). On a counter substrate (110), a light shielding film (112) is disposed at the position corresponding to periphery of each pixel (102), while a color filter (113) is disposed at the position corresponding to each of the pixels (102). This light shielding film makes the contour of the pixels clear, resulting in an image display with high definition. In addition, it is possible to fabricate the EL display device of the present invention with most of an existing manufacturing line for liquid crystal display devices. Thus, an amount of equipment investment can be significantly reduced, thereby resulting in a reduction in the total manufacturing cost.

Claims

1. A display device comprising:

a pixel portion comprising a first thin film transistor and a driving circuit portion comprising a second thin film transistor over a first substrate;

a first electrode over the first transistor;

a light emitting layer comprising an organic material formed over the first electrode;

a second electrode over the light emitting layer comprising an organic material; and

a second substrate opposed to the first substrate by an adhesive, thereby, forming a closed space between the first and second substrates,

wherein the pixel portion and the driving circuit portion are located in a region surrounded by the adhesive.

2. The display device according to claim 1, further comprising a light shielding film on the second substrate.

3. The display device according to claim 1, further comprising a color filter on the second substrate.

4. The display device according to claim 1, wherein the adhesive is a material selected from the group consisting of a photocurable epoxy resin, an acrylate type resin and a thermosetting resin.

5. The display device according to claim 1, wherein the light emitting layer comprising an organic material selected from the group consisting of PVK (polyvinyl carbazole), Bu-PBD (2-(4′

-tert-butylphenyl)-5-(4″

-biphenyl)-1,3,4-oxydiazole), coumarin 6, DCM 1 (4-dicyanomethylene-2-methyl-6-p-dimethyl aminostilyl-4H-pyran), TPB (tetra phenyl butadiene), and Nile Red into 1,2-dichloromethane.

6. The display device according to claim 1, wherein the display device is applied to a display portion of the an electronic device selected from the group consisting of an electroluminescence display, a video camera, a head mount type display, a DVD reproduction apparatus, a portable computer, a personal computer, a portable telephone and a car audio equipment.

7. The display device according to claim 1, wherein the driving circuit portion comprises at least a shift register.

8. The display device according to claim 1, wherein the closed space is filled with a transparent adhesive.

9. A display device comprising:

a pixel portion comprising a first thin film transistor and a driving circuit portion comprising a second thin film transistor over a first substrate;

a first electrode over the first transistor;

a light emitting layer comprising an organic material formed over the first electrode;

a second electrode over the light emitting layer comprising an organic material; and

a second substrate opposed to the first substrate by an adhesive, thereby, forming a closed space between the first and second substrates,

wherein the pixel portion and the driving circuit portion are located in a region surrounded by the adhesive, and

wherein the closed space between the first and second substrates is filled with inert gas.

10. The display device according to claim 9, further comprising a light shielding film on the second substrate.

11. The display device according to claim 9, further comprising a color filter on the second substrate.

12. The display device according to claim 9, wherein the adhesive is a material selected from the group consisting of a photocurable epoxy resin, an acrylate type resin and a thermosetting resin.

13. The display device according to claim 9, wherein the light emitting layer comprising an organic material selected from the group consisting of PVK (polyvinyl carbazole), Bu-PBD (2-(4′

-tert-butylphenyl)-5-(4″

-biphenyl)-1,3,4-oxydiazole), coumarin 6, DCM 1 (4-dicyanomethylene-2-methyl-6-p-dimethyl aminostilyl-4H-pyran), TPB (tetraphenyl butadiene), and Nile Red into 1,2-dichloromethane.

14. The display device according to claim 9, wherein the display device is applied to a display portion of the an electronic device selected from the group consisting of an electroluminescence display, a video camera, a head mount type display, a DVD reproduction apparatus, a portable computer, a personal computer, a portable telephone and a car audio equipment.

15. The display device according to claim 9, wherein the driving circuit portion comprises at least a shift register.

16. The display device according to claim 9, wherein the inert gas is nitrogen gas.

17. The display device according to claim 9, wherein the closed space is filled with a transparent adhesive.

18. A display device comprising:

a pixel portion comprising a first thin film transistor and a driving circuit portion comprising a second thin film transistor over a first substrate;

a first electrode over the first transistor;

a light emitting layer comprising an organic material formed over the first electrode;

a second electrode over the light emitting layer comprising an organic material; and

a second substrate opposed to the first substrate by an adhesive, thereby, forming a closed space between the first and second substrates,

wherein the pixel portion and the driving circuit portion are located in a region surrounded by the adhesive, and

wherein a drying agent is provided in the closed space between the first and second substrates.

19. The display device according to claim 18, further comprising a light shielding film on the second substrate.

20. A The display device according to claim 18, further comprising a color filter on the second substrate.

21. The display device according to claim 18, wherein the adhesive is a material selected from the group consisting of a photocurable epoxy resin, an acrylate type resin and a thermosetting resin.

22. The display device according to claim 18, wherein the light emitting layer comprising an organic material selected from the group consisting of PVK (polyvinyl carbazole), Bu-PBD (2-(4′

-tert-butylphenyl)-5-(4″

-biphenyl)-1,3,4-oxydiazole), coumarin 6, DCM 1 (4-dicyanomethylene-2-methyl-6-p-dimethyl aminostilyl-4H-pyran), TPB (tetra phenyl butadiene), and Nile Red into 1,2-dichloromethane.

23. The display device according to claim 18, wherein the display device is applied to a display portion of the an electronic device selected from the group consisting of an electroluminescence display, a video camera, a head mount type display, a DVD reproduction apparatus, a portable computer, a personal computer, a portable telephone and a car audio equipment.

24. The display device according to claim 18, wherein the driving circuit portion comprises at least a shift register.

25. The display device according to claim 18, wherein the closed space is filled with a transparent adhesive.

26. A display device comprising:

a pixel portion comprising a first thin film transistor and a driving circuit portion comprising a second thin film transistor over a first substrate;

a first electrode over the first transistor;

a light emitting layer comprising an organic material formed over the first electrode;

a second electrode over the light emitting layer comprising an organic material; and

a passivation film over the second electrode;

a second substrate opposed to the first substrate by an adhesive, thereby, forming a closed space between the first and second substrates,

wherein the pixel portion and the driving circuit portion are located in a region surrounded by the adhesive, and

wherein the passivation film covers the second electrode and extends beyond an edge of the adhesive.

27. The display device according to claim 26, further comprising a light shielding film on the second substrate.

28. The display device according to claim 26, further comprising a color filter on the second substrate.

29. The display device according to claim 26, wherein the adhesive is a material selected from the group consisting of a photocurable epoxy resin, an acrylate type resin and a thermosetting resin.

30. The display device according to claim 26, wherein the light emitting layer comprising an organic material selected from the group consisting of PVK (polyvinyl carbazole), Bu-PBD (2-(4′

-tert-butylphenyl)-5-(4″

-biphenyl)-1,3,4-oxydiazole), coumarin 6, DCM 1 (4-dicyanomethylene-2-methyl-6-p-dimethyl aminostilyl-4H-pyran), TPB (tetra phenyl butadiene), and Nile Red into 1,2-dichloromethane.

31. The display device according to claim 26, wherein the passivation film comprises a material selected from the group consisting of silicon nitride and a diamond-like carbon.

32. The display device according to claim 26, wherein the display device is applied to a display portion of the an electronic device selected from the group consisting of an electroluminescence display, a video camera, a head mount type display, a DVD reproduction apparatus, a portable computer, a personal computer, a portable telephone and a car audio equipment.

33. The display device according to claim 26, wherein the driving circuit portion comprises at least a shift register.

34. The display device according to claim 26, wherein the closed space is filled with a transparent adhesive.

35. A display device comprising:

a pixel portion comprising a first thin film transistor and a driving circuit portion comprising a second thin film transistor over a first substrate;

a first electrode over the first transistor;

a light emitting layer comprising an organic material formed over the first electrode;

a second electrode over the light emitting layer comprising an organic material; and

a passivation film over the second electrode;

a second substrate opposed to the first substrate by an adhesive, thereby, forming a closed space between the first and second substrates,

wherein the pixel portion and the driving circuit portion are located in a region surrounded by the adhesive, and

wherein the closed space between the first and second substrates is filled with inert gas, and

wherein the passivation film covers the second electrode and extends beyond an edge of the adhesive.

36. The display device according to claim 35, further comprising a light shielding film on the second substrate.

37. The display device according to claim 35, further comprising a color filter on the second substrate.

38. The display device according to claim 35, wherein the adhesive is a material selected from the group consisting of a photocurable epoxy resin, an acrylate type resin and a thermosetting resin.

39. The display device according to claim 35, wherein the light emitting layer comprising an organic material selected from the group consisting of PVK (polyvinyl carbazole), Bu-PBD (2-(4′

-tert-butylphenyl)-5-(4″

-biphenyl)-1,3,4-oxydiazole), coumarin 6, DCM 1 (4-dicyanomethylene-2-methyl-6-p-dimethyl aminostilyl-4H-pyran), TPB (tetra phenyl butadiene), and Nile Red into 1,2-dichloromethane.

40. The display device according to claim 35, wherein the passivation film comprises a material selected from the group consisting of silicon nitride and a diamond-like carbon.

41. The display device according to claim 35, wherein the display device is applied to a display portion of the an electronic device selected from the group consisting of an electroluminescence display, a video camera, a head mount type display, a DVD reproduction apparatus, a portable computer, a personal computer, a portable telephone and a car audio equipment.

42. The display device according to claim 35, wherein the driving circuit portion comprises at least a shift register.

43. The display device according to claim 35, wherein the inert gas is nitrogen gas.

44. The display device according to claim 35, wherein the closed space is filled with a transparent adhesive.

45. A display device comprising:

a pixel portion comprising a first thin film transistor and a driving circuit portion comprising a second thin film transistor over a first substrate;

a first electrode over the first transistor;

a light emitting layer comprising an organic material formed over the first electrode;

a second electrode over the light emitting layer comprising an organic material; and

a passivation film over the second electrode;

a second substrate opposed to the first substrate by an adhesive, thereby, forming a closed space between the first and second substrates,

wherein the pixel portion and the driving circuit portion are located in a region surrounded by the adhesive, and

wherein a drying agent is provided in the closed space between the first and second substrates, and

wherein the passivation film covers the second electrode and extends beyond an edge of the adhesive.

46. The display device according to claim 45, further comprising a light shielding film on the second substrate.

47. The display device according to claim 45, further comprising a color filter on the second substrate.

48. The display device according to claim 45, wherein the adhesive is a material selected from the group consisting of a photocurable epoxy resin, an acrylate type resin and a thermosetting resin.

49. The display device according to claim 45, wherein the light emitting layer comprising an organic material selected from the group consisting of PVK (polyvinyl carbazole), Bu-PBD (2-(4′

-tert-butylphenyl)-5-(4″

-biphenyl)-1,3,4-oxydiazole), coumarin 6, DCM 1(4-dicyanomethylene-2-methyl-6-p-dimethyl aminostilyl-4H-pyran), TPB (tetra phenyl butadiene), and Nile Red into 1,2-dichloromethane.

50. The display device according to claim 45, wherein the passivation film comprises a material selected from the group consisting of silicon nitride and a diamond-like carbon.

51. The display device according to claim 45, wherein the display device is applied to a display portion of the an electronic device selected from the group consisting of an electroluminescence display, a video camera, a head mount type display, a DVD reproduction apparatus, a portable computer, a personal computer, a portable telephone and a car audio equipment.

52. The display device according to claim 45, wherein the driving circuit portion comprises at least a shift register.

53. The display device according to claim 45, wherein the closed space is filled with a transparent adhesive.

54. A display device comprising:

a pixel portion comprising a first thin film transistor and a driving circuit portion comprising a second thin film transistor over a first substrate;

a first electrode over the first transistor;

a light emitting layer comprising an organic material formed over the first electrode;

a second electrode over the light emitting layer comprising the organic material;

a second substrate opposed to the first substrate by an adhesive, thereby, forming a closed space between the first and second substrates, and

a color filter on the second substrate,

wherein the pixel portion and the driving circuit portion are located in a region surrounded by the adhesive.

55. The display device according to claim 54, further comprising a light shielding film on the second substrate.

56. The display device according to claim 54, further comprising a color filter on the second substrate.

57. The display device according to claim 54, wherein the adhesive is a material selected from the group consisting of a photocurable epoxy resin, an acrylate type resin and a thermosetting resin.

58. The display device according to claim 54, wherein the light emitting layer comprising an organic material selected from the group consisting of PVK (polyvinyl carbazole), Bu-PBD (2-(4′

-tert-butylphenyl)-5-(4″

-biphenyl)-1,3,4-oxydiazole), coumarin 6, DCM 1 (4-dicyanomethylene-2-methyl-6-p-dimethyl aminostilyl-4H-pyran), TPB (tetra phenyl butadiene), and Nile Red into 1,2-dichloromethane.

59. The display device according to claim 54, wherein the display device is applied to a display portion of the an electronic device selected from the group consisting of an electroluminescence display, a video camera, a head mount type display, a DVD reproduction apparatus, a portable computer, a personal computer, a portable telephone and a car audio equipment.

60. The display device according to claim 54, wherein the driving circuit portion comprises at least a shift register.