Devices combining thin film inorganic LEDs with organic LEDs and fabrication thereof

Patent metadata

Field	Value
Publication number	US-10062738-B2
Application number	US-201415039978-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Nov 27, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

Devices including organic and inorganic LEDs are provided. Techniques for fabricating the devices include fabricating an inorganic LED on a parent substrate and transferring the LED to a host substrate via a non-destructive ELO process. Scaling techniques are also provided, in which an elastomeric substrate is deformed to achieve a desired display size.

First claim

We claim:

1. A device comprising:
a first plurality of pixels, wherein each pixel of the first plurality of pixels comprises:
an inorganic first light-emitting diode (LED) disposed over a substrate;
an organic second LED (OLED) disposed over the substrate and adjacent to the first inorganic LED: and
a third LED disposed over the substrate and adjacent to the first LED or the second LED;

wherein each of the first, the second, and the third LEDs is individually addressable as a subpixel within the each pixel of the first plurality of pixels.

2. The device of claim 1 , wherein the third LED is an OLED.

3. The device of claim 1 , wherein the inorganic first LED is configured to emit blue light.

4. The device of claim 1 , wherein the device is a device selected from the group consisting of: a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a cell phone, a tablet, a phablet, a personal digital assistant (PDA), a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display, a 3-D display, a vehicle, a large area wail, theater or stadium screen, and a sign.

5. The device of claim 1 , wherein the first LEDs is configured to emit blue light, and wherein the second LED comprises an OLED configured to emit red light.

6. The device of claim 1 , wherein the first LED is configured to emit blue light, and wherein the second LED comprises an OLED configured to emit green light.

7. The device of claim 1 , wherein the substrate is an elastomeric substrate.

8. A method comprising:
depositing an epitaxial protective layer over an epitaxial substrate;
depositing an epitaxial sacrificial layer over the epitaxial protective layer;
depositing a plurality of emissive stacks over the epitaxial sacrificial layer;
cold-welding the emissive stack to a flexible substrate;
separating the epitaxial protective layer from the emissive stack:
applying one or more layers to each stack of the plurality of emissive stacks to form a first plurality of LEDs;
transferring a first portion of the first plurality of LEDs to a first host substrate; and
fabricating a second plurality of LEDs on the first host substrate.

9. The method of claim 8 , wherein the second plurality of LEDs comprises OLEDs.

10. The method of claim 9 , wherein the first plurality of LEDs are configured to emit blue light, and wherein the second plurality of LEDs comprises OLEDs configured to emit red light.

11. The method of claim 9 , wherein the first plurality of LEDs are configured to emit blue light, and wherein the second plurality of LEDs comprises OLEDs configured to emit green light.

12. The method of claim 8 , wherein the epitaxial substrate comprises a material selected from the group consisting of: GaN, sapphire, GaAs, Si, lnP, and GaSh.

13. The method of claim 8 , further comprising:
transferring a second portion of the first plurality of LEDs to a second host substrate; and
fabricating a third plurality of LEDs on the second host substrate.

14. The method of claim 13 , wherein the third plurality of LEDs comprises OLEDs.

15. The method of claim 8 , further comprising:
deforming the first host substrate to increase the distance between adjacent LEDs on the host substrate.

16. The method of claim 15 , wherein the deforming comprises applying pressure to the first host substrate with a curved surface.

17. The method of claim 16 , wherein the curved surface comprises a device selected from the group consisting of: a rigid roll, a pin, a vacuum mold, and a spherical surface.

Assignees

• Univ Michigan Regents

Inventors

• Forrest Stephen R
• Lee Kyusang

Classifications

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G3/32

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

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• H01L27/322

  Electricity · mapped topic

• H01L27/3216

  Electricity · mapped topic