Display device and method for manufacturing display device

• US 7,495,644 B2
• Filed: 12/15/2004
• Issued: 02/24/2009
• Est. Priority Date: 12/26/2003
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Hirakata, Yoshiharu
• Primary Examiner(s): Dharia; Prabodh M.
• Application Number:
  US11/011,121
• Publication Number:
  US 20050140265A1
• Time in Patent Office: 1,532 Days
• Field of Search: 345/92, 345/430, 345/173, 345/174, 345/905, 345/80, 345/76, 345/44, 345/55, 345/82, 345/87, 313503-506, 313/483, 313/499, 445/24, 445/25, 445/43, 315/169.1, 315/0.3, 315/169.3, 438/782, 430/9, 349/196, 349/98, 257/69, 257/734, 257/59, 257/40, 257/72, 257/79, 257/432
• US Class Current: 345/92
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 50/87 Arrangements for heating or cooling
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/874 including getter material or desiccant
• CPC Class Codes: H10K 59/8794 Arrangements for heating and cooling
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

An object of the present invention is to provide a highly reliable display device and a method for manufacturing the display device with a much easy way. According to one aspect of a method for manufacturing a display device of the invention, it comprises the steps of forming a light-emitting element over a first substrate; forming a frame to surround the light-emitting element; dropping a composition containing a liquid hygroscopic substance in a region surrounded with the frame; and forming a layer containing a hygroscopic substance by solidifying the composition, wherein the first substrate and a second substrate are adhered to each other with a sealant so that the light-emitting element, the layer containing a hygroscopic substance, and the frame are sealed between the pair of substrates.

Claims

1. A display device comprising:

a pair of substrates;

a light-emitting element;

a layer containing a hydroscopic substance; and

a frame,

wherein a region surrounded with the frame is filled with the layer containing the hydroscopic substance, and

wherein the pair of substrates are adhered to each other with a sealant so that the light-emitting element, the layer containing the hydroscopic substance, and the frame are sealed with the sealant between the pair of substrates.

2. The display device according to claim 1, wherein the layer containing the hydroscopic substance is light transmitting.

3. The display device according to claim 1, wherein the sealant is separately formed from the frame.

4. A display device comprising:

a first substrate having a pixel portion comprising a light-emitting element;

a second substrate;

a layer containing a hydroscopic substance; and

a frame surrounding the pixel portion,

wherein a region surrounded with the frame is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and the second substrate are adhered to each other with a sealant so that the pixel portion, the layer containing the hydroscopic substance, and the frame are sealed with the sealant between the pair of substrates.

5. The display device according to claim 4, wherein the layer containing the hydroscopic substance is light transmitting.

6. The display device according to claim 4, wherein the layer containing the hydroscopic substance is provided over the second substrate.

7. The display device according to claim 4, wherein the frame and the sealant are made from a same substance.

8. The display device according to claim 4, wherein the first substrate further includes a circuit portion having a driver circuit and the frame surrounds the pixel portion and a part of the circuit portion.

9. The display device according to claim 4, wherein the first substrate further includes a circuit portion having a driver circuit and the frame surrounds the pixel portion and the circuit portion.

10. The display device according to claim 4, wherein the sealant is separately formed from the frame.

11. A display device comprising:

a first substrate including a pixel portion comprising a light-emitting element and a circuit portion having a driver circuit;

a second substrate;

a layer containing a hydroscopic substance;

a frame surrounding the pixel portion; and

a sealant surrounding the pixel portion and the circuit portion,

wherein a region between the frame and the sealant is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and the second substrate are adhered to each other with the sealant so that the pixel portion, the circuit portion, the layer containing the hydroscopic substance, and the frame are sealed with the sealant between the pair of substrates.

12. The display device according to claim 11, wherein the layer containing the hydroscopic substance is light transmitting.

13. The display device according to claim 11, wherein the layer containing the hydroscopic substance is provided over the second substrate.

14. The display device according to claim 11, wherein the frame and the sealant are made from a same substance.

15. The display device according to claim 11, wherein the sealant is separately formed from the frame.

16. A display device comprising:

a first substrate including a pixel portion comprising a light-emitting element and a circuit portion having a driver circuit;

a second substrate;

a layer containing a hydroscopic substance; and

a frame surrounding the circuit portion,

wherein a region surrounded with the frame is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and the second substrate are adhered to each other with a sealant so that the pixel portion, the circuit portion, the layer containing the hydroscopic substance, and the frame are sealed with the sealant between the pair of substrates.

17. The display device according to claim 16, wherein the layer containing the hydroscopic substance is light transmitting.

18. The display device according to claim 16, wherein the layer containing the hydroscopic substance is provided over the second substrate.

19. The display device according to claim 16, wherein the frame and the sealant are made from a same substance.

20. The display device according to claim 16, wherein the sealant is separately formed from the frame.

21. A display device comprising:

a first substrate including a pixel portion comprising a light-emitting element and a circuit portion having a driver circuit;

a second substrate;

a layer containing a hydroscopic substance;

a first frame surrounding the pixel portion and the circuit portion; and

a second frame surrounding the pixel portion,

wherein a region between the first frame and the second frame is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and the second substrate are adhered to each other with a sealant so that the pixel portion, the circuit portion, the layer containing the hydroscopic substance, the first frame and the second frame are sealed with the sealant between the pair of substrates.

22. The display device according to claim 21, wherein the layer containing the hydroscopic substance is light transmitting.

23. The display device according to claim 21, wherein the layer containing the hydroscopic substance is provided over the second substrate.

24. The display device according to claim 21, wherein the frame and the sealant are made from a same substance.

25. The display device according to claim 21, wherein the sealant is separately formed from the frame.

26. A method for manufacturing a display device comprising the steps of:

forming a light-emitting element over a first substrate;

forming a frame to surround the light-emitting element;

dropping a composition containing a liquid hydroscopic substance in a region surrounded with the frame; and

forming a layer containing the hydroscopic substance by solidifying the composition,

wherein the region surrounded with the frame is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and a second substrate are adhered by a sealant so that the light-emitting element, the layer containing the hydroscopic substance, and the frame are sealed with the sealant between the pair of substrates.

27. The method for manufacturing a display device according to claim 26, wherein the composition is heated to solidify and the layer containing the hydroscopic substance is formed.

28. The method for manufacturing a display device according to claim 26, wherein the layer containing the hydroscopic substance is light transmitting.

29. The method for manufacturing a display device according to claim 26, wherein the layer containing the hydroscopic substance is formed over the second substrate.

30. The method for manufacturing a display device according to claim 26, wherein the frame and the sealant are formed by using the same material.

31. The method for manufacturing a display device according to claim 26, wherein the composition is dropped in an inert gas atmosphere.

32. The method for manufacturing a display device according to claim 26, wherein the composition is dropped under a reduced pressure.

33. The method for manufacturing a display device according to claim 26, wherein a driver circuit is further formed over the first substrate and the frame is formed to surround the light-emitting element and the driver circuit.

34. The method for manufacturing a display device according to claim 26, wherein the sealant is separately formed from the frame.

35. A method for manufacturing a display device comprising the steps of:

forming a light-emitting element and a driver circuit over a first substrate;

forming a frame to surround the driver circuit;

forming a sealant to surround the light-emitting element and the driver circuit;

dropping a composition containing a liquid hydroscopic substance between the frame and the sealant; and

forming a layer containing the hydroscopic substance by solidifying the composition,

wherein a region between the frame and the sealant is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and a second substrate are adhered to each other with the sealant so that the light-emitting element, the driver circuit, the layer containing the hydroscopic substance, and the frame are sealed with the sealant between the pair of substrates.

36. The method for manufacturing a display device according to claim 35, wherein the composition is heated to solidify and the layer containing the hydroscopic substance is formed.

37. The method for manufacturing a display device according to claim 35, wherein the layer containing the hydroscopic substance is light transmitting.

38. The method for manufacturing a display device according to claim 35, wherein the layer containing the hydroscopic substance is formed over the second substrate.

39. The method for manufacturing a display device according to claim 35, wherein the frame and the sealant are formed by using the same material.

40. The method for manufacturing a display device according to claim 35, wherein the composition is dropped in an inert gas atmosphere.

41. The method for manufacturing a display device according to claim 35, wherein the composition is dropped under a reduced pressure.

42. The method for manufacturing a display device according to claim 35, wherein the sealant is separately formed from the frame.

43. A method for manufacturing a display device comprising the steps of:

forming a light-emitting element and a driver circuit over a first substrate;

forming a frame to surround the driver circuit;

dropping a composition containing a liquid hydroscopic substance in a region surrounded with the frame; and

forming a layer containing the hydroscopic substance by solidifying the composition,

wherein the region surrounded with the frame is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and a second substrate are adhered to each other with a sealant so that the light-emitting element, the driver circuit, the layer containing the hydroscopic substance, and the frame are sealed with the sealant between the pair of substrates.

44. The method for manufacturing a display device according to claim 43, wherein the composition is heated to solidify and the layer containing the hydroscopic substance is formed.

45. The method for manufacturing a display device according to claim 43, wherein the layer containing the hydroscopic substance is light transmitting.

46. The method for manufacturing a display device according to claim 43, wherein the layer containing the hydroscopic substance is formed over the second substrate.

47. The method for manufacturing a display device according to claim 43, wherein the frame and the sealant are formed by using the same material.

48. The method for manufacturing a display device according to claim 43, wherein the composition is dropped in an inert gas atmosphere.

49. The method for manufacturing a display device according to claim 43, wherein the composition is dropped under a reduced pressure.

50. The method for manufacturing a display device according to claim 43, wherein the sealant is separately formed from the frame.

51. A method for manufacturing a display device comprising the steps of:

forming a light-emitting element and a driver circuit over a first substrate;

forming a first frame to surround the light-emitting element and the driver circuit;

forming a second frame to surround the light-emitting element;

dropping a composition containing a liquid hydroscopic substance between the first frame and the second frame; and

forming a layer containing the hydroscopic substance by solidifying the composition,

wherein a region between the first frame and the second frame is filled with the layer containing the hydroscopic substance, and

wherein the first substrate and a second substrate are adhered to each other with a sealant so that the light-emitting element, the driver circuit, the layer containing the hydroscopic substance, the first frame, and the second frame are sealed with the sealant between the pair of substrates.

52. The method for manufacturing a display device according to claim 51, wherein the composition is heated to solidify and the layer containing the hydroscopic substance is formed.

53. The method for manufacturing a display device according to claim 51, wherein the layer containing the hydroscopic substance is light transmitting.

54. The method for manufacturing a display device according to claim 51, wherein the layer containing the hydroscopic substance is formed over the second substrate.

55. The method for manufacturing a display device according to claim 51, wherein the frame and the sealant are formed by using the same material.

56. The method for manufacturing a display device according to claim 51, wherein the composition is dropped in an inert gas atmosphere.

57. The method for manufacturing a display device according to claim 51, wherein the composition is dropped under a reduced pressure.

58. The method for manufacturing a display device according to claim 51, wherein the sealant is separately formed from the frame.