Inorganic LED pixel structure

• US 10,193,025 B2
• Filed: 02/23/2017
• Issued: 01/29/2019
• Est. Priority Date: 02/29/2016
• Status: Active Grant

• Current Assignee: X Display Company Technology Limited (Sensinnovat BVBA)
• Original Assignee: X-Celeprint Limited
• Inventors: Bower, Christopher, Cok, Ronald S.
• Primary Examiner(s): Choi, Calvin Y
• Application Number:
  US15/440,843
• Publication Number:
  US 20170250219A1
• Time in Patent Office: 705 Days
• Field of Search: None
• CPC Class Codes: H01L 2224/81 using a bump connector
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector

Abstract

An inorganic light-emitting diode (iLED) pixel structure includes a transparent pixel substrate having an LED surface, an emission surface opposite the LED surface, and one or more sides other than the LED surface and the emission surface that are not parallel to the LED surface or the emission surface. One or more iLEDs are mounted on the pixel substrate and each iLED has an emission side adjacent to the LED surface of the pixel substrate to emit light into the pixel substrate and out of the emission surface. A reflector is disposed on at least a portion of the one or more sides.

Claims

1. An inorganic light-emitting diode (iLED) pixel structure, comprising:

a transparent pixel substrate having an LED surface, an emission surface opposite the LED surface, and one or more sides other than the LED surface and the emission surface that are not parallel to the LED surface or the emission surface;

an iLED mounted on the LED surface of the pixel substrate, the iLED having an emission side adjacent to the LED surface of the pixel substrate to emit light into the pixel substrate and out of the emission surface, wherein the iLED is non-native to the transparent pixel substrate; and

a reflector disposed on at least a portion of the one or more sides.

2. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the pixel substrate has a thickness that is greater than a thickness of the iLED.

3. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the pixel structure comprises only one iLED.

4. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the one or more sides are each non-orthogonal to the LED surface.

5. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the emission surface is larger than the LED surface.

6. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein a thickness of the pixel substrate is less than a width of the pixel substrate.

7. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the iLED comprises electrodes disposed on a common side of the iLED, and wherein the common side of the iLED is adjacent to the pixel substrate.

8. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the iLED comprises electrodes disposed on a common side of the iLED, and wherein the common side of the iLED is on a side of the iLED opposite to the side of the iLED that is adjacent to the pixel substrate.

9. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the iLED comprises at least a portion of a tether.

10. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the pixel substrate comprises at least a portion of a tether.

11. The inorganic light-emitting diode (iLED) pixel structure of claim 1, comprising a plurality of iLEDs mounted on a common pixel substrate.

12. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein one or more of the LED surface, the emission surface, and at least a portion of the one or more sides is light diffusive.

13. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the iLED extends over a portion but less than all of the LED surface.

14. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the reflector extends over at least a portion of the LED surface that is not covered by the iLED.

15. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the iLED comprises electrodes and the pixel substrate comprises connection posts connected to the electrodes.

16. The inorganic light-emitting diode (iLED) pixel structure of claim 1, wherein the pixel structure has a length or width dimension of 200 μ

m or less.

17. A display, comprising:

a display substrate; and

a plurality of pixel structures arranged on and affixed to the display substrate, wherein each of the plurality of pixel structures comprises;

a transparent pixel substrate having an LED surface, an emission surface opposite the LED surface, and one or more sides other than the LED surface and the emission surface that are not parallel to the LED surface or the emission surface;

an iLED mounted on the LED surface of the pixel substrate, the iLED having an emission side adjacent to the LED surface of the pixel substrate to emit light into the pixel substrate and out of the emission surface, wherein the iLED is non-native to the transparent pixel substrate; and

a reflector disposed on at least a portion of the one or more sides.

18. The display of claim 17, wherein the display substrate is a front substrate and the emission surface of the pixel substrate of each of the plurality of pixel structures is affixed to the front substrate.

19. The display of claim 17, wherein the display substrate is a back substrate and the iLED of each of the plurality of pixel structures is affixed to the back substrate.

20. The display of claim 17, wherein each pixel structure comprises a plurality of iLEDs.