Micro-light emitting display device

• US 10,026,757 B1
• Filed: 03/12/2017
• Issued: 07/17/2018
• Est. Priority Date: 03/12/2017
• Status: Active Grant

• Current Assignee: Mikro Mesa Technology Co., Ltd.
• Original Assignee: Mikro Mesa Technology Co., Ltd.
• Inventors: Chang, Chun-Yi, Chen, Li-Yi
• Primary Examiner(s): SYLVIA, CHRISTINA A
• Application Number:
  US15/456,569
• Time in Patent Office: 492 Days
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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: H01L 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A display device includes an array substrate, the bottom conductive lines, the micro light emitting devices, the conductive layers, the upper conductive lines, and a filling material. The bottom conductive lines are present on the array substrate. The conductive layers are respectively present between the micro light emitting devices and the bottom conductive lines. The upper conductive lines cross the bottom conductive lines at the micro light emitting devices. Each of the micro light emitting devices is present between at least one of the bottom conductive lines and at least one of the upper conductive lines. The filling material is present on the array substrate and has at least four openings to respectively expose the micro light emitting devices. The upper conductive lines are electrically connected to the micro light emitting devices respectively through the openings.

Claims

1. A display device, comprising:

an array substrate;

at least two bottom conductive lines present on the array substrate;

at least four micro light emitting devices;

at least four conductive layers separated from each other and each present between a corresponding one of the micro light emitting devices and a corresponding one of the bottom conductive lines;

at least two upper conductive lines crossing the bottom conductive lines at the micro light emitting devices and each of the upper conductive lines crossing the bottom conductive lines, wherein each of the micro light emitting devices is present between at least one of the bottom conductive lines and at least one of the upper conductive lines; and

at least one filling material present on the array substrate and having at least four openings to respectively expose the micro light emitting devices, wherein the upper conductive lines are electrically connected to the micro light emitting devices respectively through the openings, and the openings of the filling material are respectively substantially aligned with the conductive layers.

2. The display device of claim 1, wherein at least one of the micro light emitting devices has an active layer therein, and at least one of the plurality of conductive layers is a reflective layer present between the active layer and a corresponding one of the bottom conductive lines.

3. The display device of claim 1, further comprising:

at least one conductive adhesive layer present between at least one of the bottom conductive lines and at least one of the micro light emitting devices, wherein at least one of the conductive layers is a bonding layer present between the conductive adhesive layer and a corresponding one of the micro light emitting devices.

4. The display device of claim 3, wherein at least one of the conductive adhesive layer and said at least one of the conductive layers is non-transparent, and a corresponding one of the openings is aligned with said at least one of the conductive adhesive layer and said at least one of the conductive layers.

5. The display device of claim 3, wherein at least one of the conductive adhesive layer and said at least one of the conductive layers is non-transparent, and a profile of a vertical projection of said at least one of the conductive adhesive layer and the conductive layer on a surface of the array substrate is substantially the same as a profile of a vertical projection of a corresponding one of the openings on the surface of the array substrate.

6. The display device of claim 1, wherein at least one of the micro light emitting devices has a bonding layer proximal to a corresponding one of the bottom conductive lines, wherein at least one of the conductive layers is a conductive adhesive layer present between the bonding layer and a corresponding one of the bottom conductive line.

7. The display device of claim 6, further comprising:

at least one reflective layer present between said at least one of the micro light emitting devices and the bonding layer, wherein at least one of the bonding layer and the reflective layer is non-transparent, and a profile of a vertical projection of said at least one of the bonding layer and the reflective layer on a surface of the array substrate is substantially the same as a profile of a vertical projection of a corresponding one of the openings on the surface of the array substrate.

8. The display device of claim 1, wherein the array substrate is flexible.

9. The display device of claim 1, wherein at least one of the micro light emitting devices is a vertical micro light emitting diode (LED).

10. The display device of claim 1, wherein at least one of the upper conductive lines is made of a transparent conductive material.

11. The display device of claim 1, wherein the filling material has a refractive index in a range from about 1.5 to about 2.5.

12. The display device of claim 1, wherein the filling material has at least four separated segments, and the openings are respectively present in the separated segments.

13. The display device of claim 12, further comprising:

at least one isolation substance present between the separated segments.

14. The display device of claim 1, further comprising:

at least one passivation layer present on the upper conductive lines.

15. The display device of claim 14, further comprising:

a cover substrate present on the passivation layer, wherein the cover substrate is flexible.

16. The display device of claim 14, wherein the passivation layer has a refractive index in a range from about 1.5 to about 2.5.

17. The display device of claim 1, wherein the micro light emitting devices comprise at least one red micro light emitting device, at least one green micro light emitting device, at least one blue micro light emitting device, or combinations thereof.

18. The display device of claim 1, wherein a distance between a surface of the filling material distal to the array substrate and a surface of the array substrate proximal to the filling material is greater than a distance between a surface of each of the micro light emitting devices distal to the array substrate and said surface of the array substrate.

19. The display device of claim 1, wherein the openings of the filling material are respectively substantially aligned with the conductive layers in a direction orthogonal to a surface of the array substrate.

20. The display device of claim 1, wherein one of the conductive layers is non-transparent, and a profile of a vertical projection of said one of the conductive layers on a surface of the array substrate is substantially the same as a profile of a vertical projection of a corresponding one of the openings on the surface of the array substrate.