Colour inorganic LED display for display devices with a high number of pixel

Patent metadata

Field	Value
Publication number	US-10262977-B2
Application number	US-201515329554-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Jul 31, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

An image generator for use in a display device, the image generator comprising: a plurality of ILED array chips each comprising a plurality of ILED emitters and arranged in an array such that each of a plurality of pixels of the image generator comprises an ILED emitter from each of a plurality of adjacent ILED array chips. The total area of ILED emitter material may be less than 50% of the area of each pixel. The image generator may comprise secondary optics in optical communication with an output of the plurality of ILED emitters of an ILED array chip and configured to direct light from the ILED emitters towards an emission region of the associated pixel.

First claim

The invention claimed is:

1. An image generator for use in a display device, the image generator comprising:
a plurality of inorganic light emitting diode (ILED) array chips each comprising a plurality of ILED emitters and arranged in an array such that each of a plurality of pixels of the image generator comprises an ILED emitter from each of a plurality of adjacent ILED array chips,
and wherein the total area of ILED emitter material of each pixel is less than 50% of the area of each pixel.

2. The image generator according to claim 1 , wherein the total area of the ILED emitter material is in a range from 5% to 10% of the area of each pixel.

3. The image generator according to claim 1 , further comprising secondary optics in optical communication with an output of the plurality of ILED emitters of an ILED array chip and configured to direct light from the plurality of ILED emitters towards emissions region of a plurality of pixels.

4. The image generator according to claim 3 , wherein the secondary optics comprise one or more of: reflective structures, light turning optics, light extraction features, Fresnel type structures, printed optics, etched optics, holographic optics, or diffraction grating.

5. The image generator according to claim 3 , wherein the secondary optics include light extraction features configured to reduce or remove internal reflection of the secondary optics such that light is emitted from the secondary optics.

6. The image generator according to claim 5 , wherein the secondary optics define a pixel emission region having a size and/or shape corresponding with a size and shape of the light extraction features.

7. The image generator according to claim 3 , wherein the secondary optics comprises a diffuse light guide panel.

8. The image generator according to claim 7 , wherein the diffuse light guide panel defines an interpixel region between each pixel of the display device and is configured to prevent interpixel cross talk.

9. The image generator according to claim 8 , wherein the interpixel region comprises a gap, and the gap is at least partially filled with one or more of a dielectric material and a reflective material.

10. The image generator according to claim 3 , wherein the secondary optics are directly integrated with the ILED array chip.

11. The image generator according to claim 3 , wherein the secondary optics include light turning optics integrated with light guide panels.

12. The image generator according to claim 1 , wherein each ILED array chip has a monolithic structure.

13. The image generator according to claim 12 , wherein the plurality of ILED emitters on each ILED array chip are configured to emit light of substantially the same color.

14. The image generator according to claim 13 , wherein the color is one of red, green and blue.

15. The image generator according to claim 1 , wherein the plurality of ILED emitters on each ILED array chip are configured in a 2×2 matrix.

16. The image generator according to claim 1 , wherein the ILED array chips are one of square, rectangular, triangular, circular and polygonal in shape.

17. The image generator according to claim 1 , wherein each of the plurality of ILED emitters on each ILED array chip are mounted at a corner of the ILED array chip.

18. The image generator according to claim 1 , wherein the ILED emitters are mounted on a substantially transparent carrier to emit light that propagates through the carrier.

19. The image generator according to claim 1 , wherein the ILED emitters comprise micro ILED emitters.

20. An image generator for use in a display device comprising:
a plurality of ILED array chips each comprising a plurality of ILED emitters and arranged in an array such that each pixel of the display device comprises an ILED emitter from each of a plurality of adjacent ILED array chips; and
secondary optics in optical communication with an output of the plurality of ILED emitters of an ILED array chip and configured to direct light from the plurality of ILED emitters towards emission regions of a plurality of pixels.

21. The image generator according to claim 20 , wherein the secondary optics comprise one or more of: reflective structures, light turning optics, light extraction features, Fresnel type structures, printed optics, etched optics, holographic optics, or diffraction grating.

22. The image generator according to claim 21 , wherein the secondary optics include light extraction features configured to reduce or remove internal reflection of the secondary optics such that light is emitted from the secondary optics.

23. The image generator according to claim 22 , wherein the secondary optics define a pixel emission region having a size and/or shape corresponding with a size and shape of the light extraction features.

24. The image generator according to claim 20 , further comprising a diffuse light guide panel in optical communication with an output of the secondary optics.

25. The image generator according to claim 24 , wherein the diffuse light guide panel defines an interpixel region between each pixel of the display device and configured to prevent interpixel cross talk.

26. The image generator according to claim 25 , wherein the interpixel region comprises a gap, and the gap is at least partially filled with one or more of a dielectric material and a reflective material.

27. The image generator according to claim 20 , wherein the ILED emitters are mounted on a substantially transparent carrier to emit light that propagates through the carrier.

28. The image generator according to claim 20 , wherein the secondary optics are directly integrated with the ILED array chip.

29. The image generator according to claim 20 , wherein the secondary optics are directly integrated with light guide panels.

30. The image generator according to claim 20 , wherein the ILED emitters comprise micro ILED emitters.

31. A display device comprising:
an image generator, including:
lightguides each defining a pixel of the image generator and including interpixel gaps between adjacent lightguides; and
a plurality of inorganic light emitting diode (ILED) array chips each comprising a plurality of ILED emitters and arranged such that each lightguide receives light from ILED emitters of adjacent ILED array chips at first regions of the light guide and directs the light toward an emission region of the light guide.

Assignees

• Facebook Tech Llc

Inventors

• Henry William
• Hughes Padraig
• O'Keeffe Joseph

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H01L27/156

  Electricity · mapped topic

• H01L33/24

  Electricity · mapped topic

• H01L33/58

  Electricity · mapped topic

• H01L33/10

  Electricity · mapped topic