Organic electroluminescent display device and method of fabricating the same

• US 20050140282A1
• Filed: 06/29/2004
• Published: 06/30/2005
• Est. Priority Date: 12/30/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Lee, Nam-Yang, Park, Jao-Yong
• Granted Patent: US 7,649,311 B2
• Time in Patent Office: Days
• US Class Current: 313/505
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/127 comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescent display device includes first and second substrates facing and spaced apart from each other, gate and data lines on an inner surface of the first substrate and crossing each other to define a pixel region, a switching element at a crossing point of the gate and data lines, a driving element connected to the switching element, a first electrode on an inner surface of the second substrate, an organic light-emitting layer on the first electrode in the pixel region, a second electrode on the organic light-emitting layer in the pixel region and electrically connected to the driving element, and a coloring element on an outer surface of the second substrate in the pixel region.

Claims

1. An organic electroluminescent display device, comprising:

first and second substrates facing and spaced apart from each other;

gate and data lines on an inner surface of the first substrate and crossing each other to define a pixel region;

a switching element at a crossing point of the gate and data lines;

a driving element connected to the switching element;

a first electrode on an inner surface of the second substrate;

an organic light-emitting layer on the first electrode in the pixel region;

a second electrode on the organic light-emitting layer in the pixel region and electrically connected to the driving element; and

a coloring element on an outer surface of the second substrate in the pixel region.

2. The device according to claim 1, further comprising a power line connected to the driving element.

3. The device according to claim 1, wherein the first electrode functions as an anode electrode and the second electrode acts as a cathode electrode.

4. The device according to claim 1, wherein the coloring element includes a color filter layer.

5. The device according to claim 1, wherein the coloring element includes a color-changing medium layer.

6. The device according to claim 5, wherein the coloring element further includes a color filter layer.

7. The device according to claim 5, wherein the organic light-emitting layer emits blue light.

8. The device according to claim 1, further comprising a black matrix on the outer surface of the second substrate, wherein the black matrix corresponds to a border portion between adjacent pixel regions.

9. The device according to claim 8, further comprising a passivation layer covering the coloring element and the black matrix over the outer surface of the second substrate.

10. The device according to claim 9, further comprising a transparent layer covering the passivation layer over the outer surface of the second substrate.

11. A method of fabricating an organic electroluminescent display device, comprising:

forming gate and data lines on a first substrate, the gate and data lines crossing each other to define a pixel region;

forming a switching element at a crossing point of the gate and data lines;

forming a driving element connected to the switching element;

forming a first electrode on a first surface of a second substrate;

forming an organic light-emitting layer on the first electrode;

forming a second electrode on the organic light-emitting layer;

forming a coloring element on a second surface of the second substrate;

attaching the first substrate and the second substrate including the coloring element such that the second electrode faces and is electrically connected to the driving element.

12. The method according to claim 11, wherein the first electrode functions as an anode electrode and the second electrode acts as a cathode electrode.

13. The method according to claim 12, wherein the first electrode has a higher work function than the second electrode.

14. The method according to claim 13, wherein the first electrode includes indium tin oxide, and the second electrode includes one of aluminum (Al), calcium (Ca), magnesium (Mg) and lithium-fluorine/aluminum(LiF/Al).

15. The method according to claim 11, wherein the coloring element includes a color filter layer.

16. The method according to claim 11, wherein the coloring element includes a color-changing medium layer.

17. The method according to claim 16, wherein the coloring element further includes a color filter layer.

18. The method according to claim 16, wherein the organic light-emitting layer emits blue light.

19. The method according to claim 11, further comprising forming a power line connected to the driving element.

20. The method according to claim 11, further comprising forming a black matrix on the second surface of the second substrate, wherein the black matrix corresponds to a border portion between adjacent pixel regions.

21. The method according to claim 20, further comprising forming a passivation layer covering the coloring element and the black matrix over the second surface of the second substrate.

22. The method according to claim 21, further comprising forming a transparent layer covering the passivation layer over the second surface of the second substrate.

23. The method according to claim 22, further comprising removing the transparent layer.

24. An organic electroluminescent display device, comprising:

first and second substrates facing and spaced apart from each other;

gate and data lines on an inner surface of the first substrate and crossing each other to define a pixel region;

a switching element at a crossing point of the gate and data lines;

a driving element connected to the switching element;

a first electrode on an inner surface of the second substrate;

an organic light-emitting layer on the first electrode in the pixel region;

a second electrode on the organic light-emitting layer in the pixel region and electrically connected to the driving element;

a third substrate attached to an outer surface of the second substrate; and

a coloring element on an inner surface of the third substrate.

25. The device according to claim 24, further comprising a power line connected to the driving element.

26. The device according to claim 24, wherein the first electrode functions as an anode electrode and the second electrode acts as a cathode electrode.

27. The device according to claim 24, wherein the coloring element includes a color filter layer.

28. The device according to claim 24, wherein the coloring element includes a color-changing medium layer.

29. The device according to claim 28, wherein the coloring element further includes a color filter layer.

30. The device according to claim 28, wherein the organic light-emitting layer emits blue light.

31. The device according to claim 24, further comprising a black matrix on the inner surface of the third substrate, wherein the black matrix corresponds to a border portion between adjacent pixel regions.

32. The device according to claim 31, further comprising a passivation layer covering the coloring element and the black matrix at the inner surface of the third substrate.

33. The device according to claim 24, wherein the first and second substrates are attached by a seal pattern, and the second and third substrates are attached by an adhesion layer that is applied to an entire inner surface of the third substrate.

34. The device according to claim 24, wherein the first and second substrates are attached by a first seal pattern in a peripheral portion and the second and third substrates are attached by a second seal pattern in a peripheral portion.

35. A method of fabricating an organic electroluminescent display device, comprising:

forming gate and data lines on a first substrate, the gate and data lines crossing each other to define a pixel region;

forming a switching element at a crossing point of the gate and data lines;

forming a driving element connected to the switching element;

forming a first electrode on a first surface of a second substrate;

forming an organic light-emitting layer on the first electrode in the pixel region;

forming a second electrode on the organic light-emitting layer in the pixel region, the second electrode being electrically connected to the driving element;

forming a coloring element on a third substrate;

attaching the first substrate and the second substrate such that the second electrode faces and is electrically connected to the driving element; and

attaching the third substrate to a second surface of the second substrate such that the coloring element is disposed between the third substrate and the second substrate.

36. The method according to claim 35, wherein the first electrode functions as an anode electrode and the second electrode acts as a cathode electrode.

37. The method according to claim 36, wherein the first electrode has a higher work function than the second electrode.

38. The method according to claim 37, wherein the first electrode includes indium tin oxide, and the second electrode includes one of aluminum (Al), calcium (Ca), magnesium (Mg) and lithium-fluorine/aluminum(LiF/Al).

39. The method according to claim 35, wherein the coloring element includes a color filter layer.

40. The method according to claim 35, wherein the coloring element includes a color-changing medium layer.

41. The method according to claim 40, wherein the coloring element further includes a color filter layer.

42. The method according to claim 40, wherein the organic light-emitting layer emits blue light.

43. The method according to claim 35, further comprising forming a power line connected to the driving element.

44. The method according to claim 35, further comprising forming a black matrix on a surface of the third substrate that has the color element thereon, wherein the black matrix corresponds to a border portion between adjacent pixel regions.

45. The method according to claim 44, further comprising forming a passivation layer covering the coloring element and the black matrix over the third substrate.

46. The method according to claim 35, wherein attaching the first substrate and the second substrate includes forming a seal pattern at a periphery portion, and

wherein attaching third substrate to the second surface of the second substrate includes forming an adhesion layer between substantially the entire second surface of the second substrate and substantially an entire surface of the third substrate that has the coloring element thereon.

47. The method according to claim 35, wherein attaching the first substrate and the second substrate includes forming a first seal pattern in a peripheral portion, and

wherein attaching the third substrate to the second surface of the second substrate includes forming a second seal pattern in a peripheral portion.