Colour ILED display on silicon

Patent metadata

Field	Value
Publication number	US-11468830-B2
Application number	US-202117564938-A
Country	US
Kind code	B2
Filing date	Dec 29, 2021
Priority date	Jul 31, 2014
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A method of fabricating an image generator for use in a display, the method comprising: fabricating a plurality of discrete ILED array chips comprising a plurality of ILED emitters configured to produce light having the same wavelength, and wherein each of the plurality of ILED array chips is configured to produce light having one of a plurality of wavelengths; positioning the plurality of discrete ILED array chips on a carrier substrate such that a plurality of ILED emitters from adjacent chips form a pixel of a display; and bonding a first surface of the plurality of ILED array chips to a driver backplane such that electrical contacts of the plurality of ILED array chips are in electrical communication with the driver backplane, wherein the driver backplane comprises electronics for driving the ILED array chips.

First claim

The invention claimed is:

1. A display, comprising:
inorganic light emitting diode (ILED) array chips, each of the ILED array chips including a plurality of ILED emitters configured to emit light through a first side of the ILED array chip; and
a driver backplane interconnected via a plurality of common contacts to the ILED array chips at a second sides of the ILED array chips opposite to the first side, each of the common contacts spanning across contacts of a polarity in a subset of the ILED array chips, the subset of the ILED array chips including two or more of the ILED array chips that are adjacent.

2. The display of claim 1 , wherein each of the ILED array chips includes a number of the contacts of the polarity that corresponds to a number of the plurality of ILED emitters in each of the ILED array chips, and wherein at least two of the plurality of ILED emitters in each of the ILED array chips are connected to different ones of the common contacts.

3. The display of claim 1 , wherein ILED emitters of the two or more of the adjacent ILEDs in the subset form a single pixel of the display.

4. The display of claim 3 , wherein the two or more of the adjacent ILED array chips include a first ILED array chip including first ILED emitters configured to produce a red light, a second array ILED array chip including second ILED emitters configured to produce a green light, and a third ILED array chip including third ILED emitters configured to produce a blue light.

5. The display of claim 4 , wherein each of the first ILED emitters in the first ILED array is part of different pixels.

6. The display of claim 1 , wherein the driver backplane includes thin-film transistor (TFT) circuitry configured to operate the ILED array chips by providing current through the common contacts.

7. The display of claim 1 , wherein the common contacts are p-contacts, and n-contacts of the ILED array chips are individually addressable by the driver backplane.

8. The display of claim 1 , wherein the driver backplane includes complementary metal-oxide-semiconductor (CMOS) circuitry or thin-film transistor (TFT) circuitry.

9. The display of claim 1 , wherein each of the ILED emitters is located at a corner of a corresponding ILED array chip.

10. The display of claim 1 , wherein each of the ILED array chips includes one of:
gallium nitride (GaN);
gallium phosphide (GaP); or
gallium arsenide (GaAs).

11. The display of claim 1 , wherein spacing between adjacent ILED array chips is less than 100 μm.

12. The display of claim 1 , wherein each ILED emitter of each ILED array chip includes a reflective mesa structure for reflecting generated light at an angle such that the generated light escapes the ILED emitter.

13. The display of claim 1 , wherein each of the ILED array chips is of a rectangular, triangular, or hexagonal shape.

14. A method of operating a display, comprising:
coupling a first contact of a first polarity to a first voltage level, the first contact shared across a subset of inorganic light emitting diode (ILED) array chips that are adjacent in the display;
coupling a second contact of a second polarity to a second voltage level different from the first voltage level, the second contact shared across a plurality of ILED emitters in one of the ILED array chips;
providing current to one of the ILED emitters in the one of the subset of the ILED array chip using the first contact and the second contact; and
emitting light from the one of the ILED emitter in the one of the subset of the ILED array chip responsive to providing the current to the one of the ILED emitters.

15. The method of claim 14 , further comprising:
coupling a third contact of the first polarity to the second voltage level;
providing current to another of the ILED emitters in the one of the subset of the ILED array using the second contact and the third contact; and
emitting light from the other of the ILED emitters in the one of the subset of the ILED array chip to the other of the ILED emitters in the one of the subset of the ILED array.

16. The method of claim 14 , wherein the ILED emitters in one of the ILED array chips emit light of a same color.

17. The method of claim 14 , wherein the ILED emitters of two or more of the ILED array chips form a single pixel of the display.

18. The method of claim 14 , wherein a thin-film transistor (TFT) circuitry couples the first contact to the first voltage level and couples the second contact to the second voltage level, and wherein the TFT circuit provided in a driver backplane at a side of the ILED array chips opposite to another side of the ILED array chips through which the light is emitted.

19. The method of claim 14 , wherein the first contact is p contact and the second contact is an n contact.

20. The method of claim 14 , wherein each of the ILED emitters is located at a corner of a corresponding ILED array chip.

Assignees

• Meta Platforms Tech Llc

Inventors

• Henry William
• Hughes Padraig
• O'Keeffe Joseph

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09F9/302

  characterised by the form or geometrical disposition of the individual elements · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• H01L33/62

  Electricity · mapped topic