Full-color display divice

• US 20040070333A1
• Filed: 01/06/2003
• Published: 04/15/2004
• Est. Priority Date: 10/11/2002
• Status: Active Grant

• Current Assignee: Epistar Corporation (Ennostar, Inc.)
• Original Assignee: Highlink Technology Corp. (Ennostar, Inc.)
• Inventors: Huang, Shih-Cheng, Lin, Ming-Der, Chung, Yi-Tai, Wang, Kwang-Ru, Yeh, Ming-Fa
• Granted Patent: US 6,856,087 B2
• Time in Patent Office: Days
• US Class Current: 313/500
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/12044 OLED
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A full-color display device is disclosed. The present invention comprises a plurality of pixel units each comprising a base, a plurality of transparent conductive substrates, a plurality of light emitting elements, and a plurality of electrode parts. The base has at least three openings formed thereon, the bottom of each opening is a reflective surface, and each of the transparent conductive substrates individually covers each opening. Each of the light emitting elements is individually disposed on one side of each transparent conductive substrate and held in each opening. Each of the electrode parts is formed on the base and electrically connected to the electrodes of the light emitting elements and the transparent conductive substrates.

Claims

1. A full-color display device comprising a plurality of pixel units, wherein each of the plurality of pixel units comprises:

a base having at least three openings, wherein a bottom of each of the at least three openings is a reflective surface;

a plurality of transparent conductive substrates respectively covering the at least three openings;

a plurality of light-emitting elements, wherein each of the plurality of light-emitting elements is respectively disposed on a side of each of the plurality of transparent conductive substrates, and each of the plurality of light-emitting elements is respectively held in each of the at least three openings; and

a plurality of electrode parts, wherein the plurality of electrode parts are formed on the base, and the plurality of electrode parts are respectively electrically connected to a plurality of electrodes of the plurality of transparent conductive substrates.

2. The full-color display device according to claim 1, wherein the plurality of light-emitting elements are selected from a group consisting of light-emitting diode chip (LED chip), organic light-emitting diode (OLED), and laser diode.

3. The full-color display device according to claim 1, wherein a light emitted by each of the plurality of light-emitting elements is respectively reflected out by the reflective surface.

4. The full-color display device according to claim 1, wherein a light emitted by each of the, plurality of light-emitting elements is respectively emitted out through each of the plurality of transparent conductive substrates.

5. The full-color display device according to claim 1, wherein one part of a light emitted by each of the plurality of light-emitting elements is emitted out through each of the plurality of transparent conductive substrates, and another part of the light emitted by each of the plurality of light-emitting elements is reflected out by the reflective surface.

6. The full-color display device according to claim 1, wherein an inner wall of each of the at least three openings has a light-reflecting layer.

7. The full-color display device according to claim 1, wherein the reflective surface is selected from a group consisting of a convex curved surface and a concave curved surface.

8. The full-color display device according to claim 7, wherein an angle at which a reflective light reflected by the concave curved surface depends on a curvature of the concave curved surface.

9. The full-color display device according to claim 1, wherein the reflective surface comprises a first fluorescent layer, a second fluorescent layer, and a third fluorescent layer, thereby changing a wavelength of a light via the reflective surface.

10. The full-color, display device according to claim 9, wherein the first fluorescent layer changes the wavelength of the light via the reflective surface, thereby enabling at least one of the plurality of pixel units of the full-color display device to emit a red light.

11. The full-color display device according to claim 9, wherein the second fluorescent layer changes the wavelength of the light via the reflective surface, thereby enabling at least one of the plurality of pixel units of the full-color display device to emit a green light.

12. The full-color display device according to claim 9, wherein the third fluorescent layer changes the wavelength of the light via the reflective surface, thereby enabling at least one of the plurality of pixel units of the full-color display device to emit a blue light.

13. The full-color display device according to claim 1, wherein the material of the base is selected from a group consisting of ceramic material, metal material, alloy material, crystalline material, and semiconductor material.

14. The full-color display device according to claim 1, wherein each of the plurality of transparent conductive substrates comprises:

a transparent plate;

a transparent electrode thin film formed on the transparent plate; and

an insulating part formed on the transparent plate, wherein the insulating part divides the transparent electrode thin film into a first transparent electrode thin film area and a second transparent electrode thin film area that are not mutually electrically conducted to each other, wherein the first transparent electrode thin film area and the second transparent electrode thin film area are respectively electrically connected to two electrodes of each of the plurality of light-emitting elements, and the first transparent electrode thin film area and the second transparent electrode thin film area are respectively electrically connected to two of the plurality of electrode parts.

15. The full-color display device according to claim 14, wherein the first transparent electrode thin film area and the second transparent electrode thin film area are respectively electrically connected to the two electrodes of each of the plurality of light-emitting elements in a way of wire bond.

16. The full-color display device according to claim 14, wherein the first transparent electrode thin film area and the second transparent electrode thin film area are respectively electrically connected to the two electrodes of each of the plurality of light-emitting elements in a way of flip-chip.

17. The full-color display device according to claim 14, wherein the transparent plate thereon further comprises an optically-filtering coating.

18. The full-color display device according to claim 14, wherein the material of the transparent electrode thin film is selected from a group consisting of ITO, ZnO, CTO, IZO, ZrO₂, and AZO.

19. The full-color display device according to claim 14, wherein the material of the transparent electrode thin film is selected from a group consisting of Ni, Ag, Al, Ti, Cr, Au, Pt, W, WSi₂, Zn, In, and Al—

Si alloy.

20. The full-color display device according to claim 14, wherein the material of the transparent electrode thin film is selected from a group consisting of ITO, ZnO, CTO, IZO, ZrO₂, AZO, Ni, Ag, Al, Ti, Cr, Au, Pt, W, WSi₂, Zn, In, and Al—

Si alloy.

21. The full-color display device according to claim 1, wherein the plurality of electrode parts are surface mounted devices (SMD).

22. The full-color display device according to claim 1, wherein each of the plurality of light-emitting elements is suspended from the bottom of each of the at least three openings.

23. A full-color display device comprising a plurality of pixel units, wherein each of the plurality of pixel units comprises:

a base having at least three openings, wherein a bottom of each of the at least three openings is a reflective surface;

a plurality of transparent conductive substrates respectively covering the at least three openings;

a plurality of light-emitting elements, wherein each of the plurality of light-emitting elements is respectively held in each of the at least three openings, and each of the plurality of light-emitting elements is respectively disposed on the bottom of each of the at least three openings; and

a plurality of electrode parts, wherein the plurality of electrode parts are formed on the base, and the plurality of electrode parts are respectively electrically connected to a plurality of electrodes of the plurality of transparent conductive substrates.

24. The full-color display device according to claim 23, wherein the electrode parts are of stair-shape.

25. The full-color display device according to claim 23, further comprising a plurality of conductive wires, wherein the plurality of light-emitting elements are electrically connected to the electrode parts by the plurality of conductive wires in a way of wire bond.

26. A full-color display device comprising a plurality of pixel units, wherein each of the plurality of pixel units comprises:

a base having an opening, wherein a bottom of the opening is a reflective surface;

a transparent conductive substrate covering the opening;

three light-emitting elements, wherein the three light-emitting elements are disposed on a side of the transparent conductive substrate, and the three light-emitting elements are held in the opening; and

two electrode parts, wherein the two electrode parts are formed on the base, and the two electrode parts are respectively electrically connected to two electrodes of the transparent conductive substrate.

27. The full-color display device according to claim 26, wherein the three light-emitting elements are selected from a group consisting of LED chip, OLED, and laser diode.

28. The full-color display device according to claim 26, wherein a light emitted by each of the three light-emitting elements is respectively reflected out by the reflective surface.

29. The full-color display device according to claim 26, wherein a light emitted by each of the three light-emitting elements is respectively emitted out through the transparent conductive substrate.

30. The full-color display device according to claim 26, wherein one part of a light emitted by each of the three light-emitting elements is emitted out through the transparent conductive substrate, and another part of the light emitted by each of the three light-emitting elements is reflected out by the reflective surface.

31. The full-color display device according to claim 26, wherein an inner wall of the opening has a light-reflecting layer.

32. The full-color display device according to claim 26, wherein the reflective surface is selected from a group consisting of a convex curved surface and a concave curved surface.

33. The full-color display device according to claim 26, wherein the material of the base is selected from a group consisting of ceramic material, metal material, alloy material, crystalline material, and semiconductor material.

34. The full-color display device according to claim 26, wherein the transparent conductive substrate comprises:

a transparent plate;

a transparent electrode thin film formed on the transparent plate; and

a plurality of insulating parts formed on the transparent plate, wherein the plurality of insulating parts divide the transparent electrode thin film into a plurality of first transparent electrode thin film areas as a plurality of positive electrodes of the transparent conductive substrate and at least one second transparent electrode thin film area as at least one negative electrode of the transparent conductive substrate, wherein the plurality of first transparent electrode thin film areas and the at least one second transparent electrode thin film area are not mutually conducted to each other, and are respectively electrically connected to two electrodes of each of the three light-emitting elements, and are respectively electrically connected to the two electrode parts.

35. The full-color display device according to claim 34, wherein the plurality of first transparent electrode thin film areas and the at least one second transparent electrode thin film area are respectively electrically connected to the two electrodes of each of the three light-emitting elements in a way of wire bond.

36. The full-color display device according to claim 34, wherein the plurality of first transparent electrode thin film areas and the at least one second transparent electrode thin film area are respectively electrically connected to the two electrodes of each of the three light-emitting elements in a way of flip-chip.

37. The full-color display device according to claim 34, wherein the transparent plate thereon further comprises an optically-filtering coating.

38. The full-color display device according to claim 34,wherein the material of the transparent electrode thin film is selected from a group consisting of ITO, ZnO, CTO, IZO, ZrO₂, and AZO.

39. The full-color display device according to claim 34, wherein the material of the transparent electrode thin film is selected from a group consisting of Ni, Ag, Al, Ti, Cr, Au, Pt, W, WSi₂, Zn, In, and Al—

Si alloy.

40. The full-color display device according to claim 34, wherein the material of the transparent electrode thin film is selected from a group consisting of ITO, ZnO, CTO, IZO, ZrO₂, AZO, Ni, Ag, Al, Ti, Cr, Au, Pt, W, WSi₂, Zn, In, and Al—

Si alloy.

41. The full-color display device according to claim 26, wherein the two electrode parts are surface mounted devices (SMD).

42. The full-color display device according to claim 26, wherein the three light-emitting elements are suspended from the bottom of the opening.

43. A full-color display device comprising a plurality of pixel units, wherein each of the plurality of pixel units comprises:

a base having at least one opening, wherein a bottom of the at least one opening is a reflective surface;

at least one transparent conductive substrate respectively covering the at least one opening; and

at least one light-emitting element, wherein the at least one light-emitting element is respectively held in the at least one opening, and the at least one light-emitting elements is respectively disposed on the bottom of the at least one opening.

44. The full-color display device according to claim 43, wherein the material of the at least one transparent conductive substrate is selected from a group consisting of GaP, InGaP/GaP (InGaP formed on a GaP substrate), InGaP/Glass (InGaP formed on a glass substrate), and GaP/Sapphire (GaP formed on a sapphire substrate).

45. The full-color display device according to claim 44, wherein the at least one transparent conductive substrate or the bottom of the at least one opening thereon is further coated with a fluorescent powder.

46. The full-color display device according to claim 44, wherein the at least one transparent conductive substrate and the bottom of the at least one opening thereon are further coated with a fluorescent powder.

47. The full-color display device according to claim 44, wherein a sidewall of the at least one opening thereon is further coated with a fluorescent powder.

48. The full-color display device according to claim 43, wherein the material of the at least one transparent conductive substrate is selected from a group consisting of GaP, ZnSe, AlInGaP/GaP (AlInGaP formed on a GaP substrate), AlGaAs/GaAs (AlGaAs formed on a GaAs substrate), AlInGaP/GaAs (AlInGaP formed on a GaAs substrate), and AlGaAs/GaP (AlGaAs formed on a GaP substrate).

49. The full-color display device according to claim 48, wherein the bottom of the at least one opening thereon is further coated with a fluorescent powder.

50. The full-color display device according to claim 48, wherein a sidewall of the at least one opening thereon is further coated with a fluorescent powder.

51. The full-color display device according to claim 43, wherein the material of the at least one transparent conductive substrate is selected from a group consisting of GaP, ZnSe, AlGaAs/ITO (AlGaAs formed on an ITO substrate), AlInGaP/GaAs, AlInGaP/GaP, AlInGaP/Glass (AlInGaP formed on a glass substrate), AlInGaP/Sapphire (AlInGaP formed on a sapphire substrate), and AlGaAs/GaP.

52. The full-color display device according to claim 43, wherein each of the at least one transparent conductive substrate further comprises an epitaxial layer.

53. A full-color display device comprising a plurality of pixel units, wherein each of the plurality of pixel units comprises:

a base having at least one opening, wherein a bottom of the at least one opening is a reflective surface;

at least one transparent conductive substrate covering the at least one opening, wherein there is further an epitaxial layer on the at least one transparent conductive substrate or the reflective surface; and

at least one light-emitting element, wherein the at least one light-emitting element is held in the at least one opening.

54. The full-color display device according to claim 53, further comprising at least one fluorescent powder, wherein a position on which the at least one fluorescent powder is coated is selected from a group consisting of the reflective surface, a sidewall of the at least one opening, the at least one transparent conductive substrate, and the epitaxial layer.

55. The full-color display device according to claim 53, wherein the at least one light-emitting element is disposed on the bottom or a top of the at least one opening.

56. A full-color display device comprising a plurality of pixel units coated with at least one fluorescent powder, wherein each of the plurality of pixel units comprises:

a base having at least one opening, wherein a bottom of the at least one opening is a reflective surface;

at least one transparent conductive substrate covering the at least one opening; and

at least one light-emitting element held in the at least one opening.

57. The full-color display device according to claim 56, wherein a position on which the at least one fluorescent powder is coated is selected from a group consisting of the reflective surface, a sidewall of the at least one opening, and the at least one transparent conductive substrate.

58. The full-color display device according to claim 57, further comprising an epitaxial layer, wherein a position of the epitaxial layer is selected from a group consisting of on the at least one transparent conductive substrate and on the reflective surface.

59. The full-color display device according to claim 58, wherein the at least one fluorescent powder is coated on the epitaxial layer.

60. The full-color display device according to claim 56, wherein the at least one light-emitting element is disposed on the bottom or a top of the at least one opening.