Integrated colour LED micro-display

Patent metadata

Field	Value
Publication number	US-10008645-B2
Application number	US-201515526279-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Nov 18, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

There is herein described a low power consumption high brightness display. More particularly, there is described an integrated LED micro-display and a method of manufacturing the integrated LED micro-display.

First claim

The invention claimed is:

1. A method of fabricating an integrated light emitting diode (LED) micro-display comprising:
providing a color converter capable of changing wavelength of light, the color converter including:
a substrate;
a color conversion layer formed on the substrate;
a transparent layer formed on the substrate; and
a mask formed between the color conversion layer and the transparent layer;

providing a micro-LED array connected to the color converter and which is capable of forming electrical connections and pumping light into the color converter; and
providing a backplane controller for the micro-LED array in the form of an electronic drive layer; wherein the color conversion layer of the color converter produces light at a longer wavelength than the pumped light from the micro-LED array.

2. The method according to claim 1 , wherein:
the micro-LED array pumps blue light into the color converter; and
the color converter converts a portion of the blue light to green and red light.

3. The method according to claim 1 , wherein:
the micro-LED array pumps ultraviolet (UV) light into the color converter; and
the color converter converts the UV light into red, green and blue light.

4. The method according to claim 1 , wherein the color converter includes:
opaque/reflective features on a first side of the substrate;
a modified refractive index transparent layer which provides an optical waveguiding function on a second side of the substrate; and
an un-modified refractive index layer on the second side of the substrate.

5. The method of fabricating an integrated LED micro-display according to claim 1 , wherein the color converter includes
a long pass filter on the color conversion layer, wherein the long pass filter allows converted light by the color conversion layer to pass from the color conversion layer, but recycles unconverted light.

6. The method according to claim 1 , wherein the color conversion layer includes a phosphor or quantum dot or organic substance coupled to a first portion of micro-LEDs of the micro-LED array and the transparent layer is a diffusing layer coupled to a second portion of micro-LEDs of the micro-LED array.

7. The method according to claim 1 , wherein the mask is opaque or reflective, the mask being further positioned between a modified refractive index layer and an un-modified refractive index layer.

8. An integrated light emitting diode (LED) micro-display comprising:
a color converter capable of changing wavelength of light, the color converter including:
a substrate;
a color conversion layer formed on the substrate;
a transparent layer formed on the substrate; and
a mask formed between the color conversion layer and the transparent layer;

a micro-LED array connected to the color converter and which is capable of forming electrical connections and pumping light into the color converter; and
a backplane controller for the micro-LED array in the form of an electronic drive layer;
wherein the color conversion layer of the color converter produces light at a longer wavelength than the pumped light from the micro-LED array.

9. The integrated LED micro-display according to claim 8 , wherein the color conversion layer is made from at least one of phosphor, quantum dot, or organic substance.

10. The integrated color LED micro-display according to claim 8 , wherein the substrate is made from glass, sapphire, silicon, gallium nitride (GaN), or silicon carbide.

11. The integrated LED micro-display according to claim 8 , wherein the transparent layer allows blue light to exit or alternatively provides a diffusing or scattering function.

12. The integrated LED micro-display according to claim 8 , wherein the mask is opaque/black or reflective.

13. The integrated LED micro-display according claim 8 , wherein the micro-LED array comprises optical features including lenses.

14. The integrated LED micro-display according to claim 13 , wherein the optical features are convex in shape and maximize emission and minimise spectral crosstalk.

15. The integrated LED micro-display according to claim 8 , wherein:
the micro-LED array comprises bond pads which are deposited to form n and p contacts; and
the electronic drive layer has bond pads attached to the bond pads of the micro-LED array.

16. The integrated color LED micro-display according to claim 8 , wherein:
the micro-LED array pumps blue light into the color converter; and
the color converter converts a portion of the blue light to green and red light.

17. The integrated color LED micro-display according to claim 8 , wherein:
the micro-LED array pumps ultraviolet (UV) light into the color converter; and
the color converter converts the UV light into red, green and blue light.

18. The integrated color LED micro-display according to claim 8 , wherein the color convertor further comprises opaque/reflective features on a side of the substrate opposite the color conversion layer and the transparent layer.

19. A method for providing a light emitting diode (LED) micro-display having pixels with different color sub-pixels, comprising:
emitting light from a micro-LED array optically coupled to a color converter, the color converter including:
a substrate;
a color conversion layer formed on the substrate;
a transparent layer formed on the substrate; and
a mask formed between the color conversion layer and the transparent layer;

converting, by the color conversion layer of the color converter, light from a first micro-LED of the micro-LED array into a second light having a different wavelength than the light emitted from the micro-LED array; and
transmitting, by the transparent layer of the color converter, light from a micro-LED of the micro-LED array, the light and the second light providing different color sub-pixels of a pixel.

Assignees

• Oculus Vr Llc

Inventors

• Bonar James Ronald
• Valentine Gareth John
• Gorton Stephen Warren

Classifications

• H10W90/00

  Package configurations · CPC title

• H01L2933/0066

  Electricity · mapped topic

• H01L2933/0058

  Electricity · mapped topic

• H01L33/62

  Electricity · mapped topic

• H01L33/58

  Electricity · mapped topic