# US 11,908,981 B2 · Laser printing of color converter devices on micro led display devices and methods

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- Number: US 11,908,981 B2
- Document ID: US11908981B2
- Status: Granted
- Kind: B2
- Application number: 17/944,732
- Filed: 2022-09-14
- Published: 2023-01-12
- Granted: 2024-02-20
- Earliest claimed: 2018-10-11
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Khaled Ahmed; Anup Pancholi
- Web page: https://patentgrep.com/patent/US11908981B2

## CPC

- H10W 90/00: Package configurations
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- H10H 20/8515: {not being in contact with the bodies}
- H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout}
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10H 20/0361: {of wavelength conversion means}
- H10H 20/8512: {Wavelength conversion materials}
- H10H 20/852: Encapsulations
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10K 59/1201: {Manufacture or treatment}
- H10K 59/873: {Encapsulations}
- H10K 59/878: {comprising reflective means}
- H10K 71/80: using temporary substrates
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Embodiments disclosed herein include micro light emitting device (LED) display panels and methods of forming such devices. In an embodiment, a display panel includes a display backplane substrate, a light emitting element on the display backplane, a transparent conductor over the light emitting element, a dielectric layer over the transparent conductor, and a color conversion device over the light emitting element. In an embodiment, the dielectric layer separates the transparent conductor from the color conversion device.

## Claims

### Claim 1

A display panel, comprising:
a display backplane substrate;
a light emitting element on the display backplane substrate;
a transparent conductor over the light emitting element;
a dielectric layer over the transparent conductor; and
a color conversion device over the light emitting element within a groove of the dielectric layer, wherein the color conversion device is spaced apart from a sidewall of the groove,
wherein the dielectric layer separates the transparent conductor from the color conversion device.

### Claim 2 (depends on 1)

The display panel of claim 1, wherein the light emitting element is a micro-light emitting diode (LED).

### Claim 3 (depends on 1)

The display panel of claim 1, wherein the light emitting element is an organic light emitting diode (OLED).

### Claim 4 (depends on 1)

The display panel of claim 1, wherein the light emitting element emits blue light, and wherein the color conversion device converts the blue light to red light, green light, or orange light.

### Claim 5 (depends on 4)

The display panel of claim 4, wherein the color conversion device comprises quantum dots or nanophosphors.

### Claim 6

A display panel comprising:
a display backplane substrate;
a light emitting element on the display backplane substrate;
a transparent conductor over the light emitting element;
a dielectric layer over the transparent conductor; and
a color conversion device over the light emitting element,
wherein the dielectric layer separates the transparent conductor from the color conversion device,
wherein the dielectric layer comprises a groove,
wherein the color conversion device is within the groove, and
wherein sidewalls of the groove comprise a reflective layer.

### Claim 7

A display panel comprising:
a display backplane substrate;
a light emitting element on the display backplane substrate;
a transparent conductor over the light emitting element;
a dielectric layer over the transparent conductor;
a color conversion device over the light emitting element; and
a sealant over the dielectric layer, wherein sealant covers the color conversion device,
wherein the dielectric layer separates the transparent conductor from the color conversion device.

### Claim 8 (depends on 7)

The display panel of claim 7, wherein the sealant has a refractive index that is less than a refractive index of the dielectric layer.

### Claim 9 (depends on 6)

The display panel of claim 6, wherein the light emitting element is a micro-light emitting diode (LED).

### Claim 10 (depends on 6)

The display panel of claim 6, wherein the light emitting element is an organic light emitting diode (OLED).

### Claim 11 (depends on 6)

The display panel of claim 6, wherein the light emitting element emits blue light, and wherein the color conversion device converts the blue light to red light, green light, or orange light.

### Claim 12 (depends on 11)

The display panel of claim 11, wherein the color conversion device comprises quantum dots or nanophosphors.

### Claim 13 (depends on 7)

The display panel of claim 7, wherein the light emitting element is a micro-light emitting diode (LED).

### Claim 14 (depends on 7)

The display panel of claim 7, wherein the light emitting element is an organic light emitting diode (OLED).

### Claim 15 (depends on 7)

The display panel of claim 7, wherein the light emitting element emits blue light, and wherein the color conversion device converts the blue light to red light, green light, or orange light.

### Claim 16 (depends on 15)

The display panel of claim 15, wherein the color conversion device comprises quantum dots or nanophosphors.

### Claim 17 (depends on 7)

The display panel of claim 7, wherein the dielectric layer comprises a groove, and wherein the color conversion device is within the groove.