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

Patent metadata

Field	Value
Publication number	US-2020343228-A1
Application number	US-202016882197-A
Country	US
Kind code	A1
Filing date	May 22, 2020
Priority date	Jul 31, 2014
Publication date	Oct 29, 2020
Grant date	—

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 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

1 . A display device, comprising:
a first inorganic light emitting diode (ILED) chip including a first ILED emitter, the first ILED emitter including an area of ILED emitter material configured to emit first light; and a lightguide configured to receive the first light from the first ILED emitter and output the first light at a light emission region of the lightguide, the light emission region defining a surface of a pixel of the display device, an area of the light emission region being larger than the area of ILED emitter material of the first ILED emitter.

2 . The display device of claim 1 , further comprising a second ILED chip including a second ILED emitter configured to emit second light, and wherein the lightguide is configured to receive the second light from the second ILED emitter and output the second light at the light emission region of the lightguide.

3 . The display device of claim 2 , wherein a first subpixel of the pixel uses the first light from the first ILED emitter and a second subpixel of the pixel uses the second light from the second ILED emitter.

4 . The display device of claim 2 , further comprising a third ILED chip including a third ILED emitter configured to emit third light, and wherein the lightguide is configured to receive the third light from the third ILED emitter and output the third light at the light emission region of the lightguide.

5 . The display device of claim 4 , wherein the first light is red light, the second light is green light, and the third light is blue light.

6 . The display device of claim 1 , wherein the lightguide comprises:
a first side including an input region to receive the first light; and a second side opposite the first side, the second side including the light emission region.

7 . The display device of claim 6 , wherein the lightguide further comprises reflector optics configured to reflect the first light coupled into the lightguide at the input region.

8 . The display device of claim 7 , wherein the reflector optics includes a corner reflector positioned in a corner of the lightguide at an intersection of the second side and a third side of the lightguide between the first and second sides.

9 . The display of claim 6 , wherein the lightguide further comprises a backreflector layer positioned along the second side of the lightguide to reflect the first light internally within the lightguide before emitting through the light emission region.

10 . The display of claim 1 , wherein the lightguide further comprises light extraction features at the light emission region, the light extraction features reducing internal reflection of the first light at the light emission region.

11 . The display device of claim 10 , wherein the light extraction features include ridged features.

12 . The display device of claim 10 , wherein the light extraction features are etched into a surface of the lightguide or mounted onto the surface of the lightguide.

13 . The display device of claim 1 , wherein the first ILED chip comprises a second ILED emitter.

14 . The display device of claim 13 , wherein the first and second ILED emitters of the first ILED chip emit light having the same color.

15 . The display device of claim 1 , wherein the first ILED chip is embedded in the lightguide.

16 . The display device of claim 1 , wherein the lightguide controls directionality of the first light outputted at the light emission region.

17 . A display device, comprising:
inorganic light emitting diode (ILED) chips, each ILED chip including ILED emitters; and a lightguide including lightguide portions separated by interpixel gaps, each lightguide portion configured to receive light from adjacent ILED emitters of different ILED chips and output the light at a light emission region of the lightguide portion, the light emission region of each lightguide portion defining a surface of a pixel of the display device, the ILED emitters of each ILED chip provide light to different lightguide portions.

18 . The display device of claim 17 , wherein the adjacent ILED emitters that emit light into each of the lightguide portions include a first ILED emitter that emits a first color light and a second ILED emitter that emits a second color light different from the first color light.

19 . The display device of claim 17 , wherein:
each ILED emitter of each ILED chip includes an area of ILED emitter material; and an area of the light emission region of each lightguide portion is larger than the area of ILED emitter material of the adjacent ILED emitters that emit light into the lightguide portion.

20 . The display device of claim 19 , wherein:
each of the lightguide portions control directionality of the light output at the light emission region; and the interpixel gaps reduce interpixel crosstalk between the ILED emitters of each ILED chip.

Assignees

• Facebook Tech Llc

Inventors

• Henry William
• Hughes Padraig
• O'Keeffe Joseph

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H29/142 Primary

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• H10H20/856

  Reflecting means · CPC title

• H10H20/821

  of the light-emitting regions, e.g. non-planar junctions · CPC title