# US 2025/0098376 A1 · Inorganic light emitting diode and display module including the same

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- Number: US 2025/0098376 A1
- Document ID: US20250098376A1
- Status: Published application
- Kind: A1
- Application number: 18/799,711
- Filed: 2024-08-09
- Published: 2025-03-20
- Earliest claimed: 2023-09-18
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Kihyung KANG; Kimura SHUNSUKE
- Web page: https://patentgrep.com/patent/US20250098376A1

## CPC

- H10H 20/8512: {Wavelength conversion materials}
- H10H 29/8512: {Wavelength conversion materials}
- H10D 86/00: Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10H 20/82: Roughened surfaces, e.g. at the interface between epitaxial layers
- H10H 20/851: Wavelength conversion means
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- H10H 20/8515: {not being in contact with the bodies}
- H10H 20/854: characterised by their material, e.g. epoxy or silicone resins
- H10H 20/856: Reflecting means
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10H 29/8514: {characterised by their shape, e.g. plate or foil}
- H10W 90/00: Package configurations
- H10H 20/841: Reflective coatings, e.g. dielectric Bragg reflectors
- H10H 29/30: Active-matrix LED displays
- H10H 29/8421: {Reflective coatings, e.g. dielectric Bragg reflectors}
- H10H 29/8517: {Colour filters}
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A display module may include a substrate and an inorganic light emitting diode on the substrate. The inorganic light emitting diode includes: an active layer configured to generate light having a first color; a light emitting surface spaced apart from the active layer; a groove part including grooves recessed in the light emitting surface; and a quantum dot (QD) layer in the groove part and configured to convert the light having the first color generated in the active layer into a second color. The display module may further include a color filter corresponding to the inorganic light emitting diode and configured to absorb the light having the first color emitted from the inorganic light emitting diode.

## Claims

### Claim 1

A display module comprising:
a substrate;
an inorganic light emitting diode on the substrate, the inorganic light emitting diode comprising:
an active layer configured to generate light having a first color;
a light emitting surface spaced apart from the active layer;
a groove part comprising grooves recessed in the light emitting surface; and
a quantum dot (QD) layer in the groove part and configured to convert the light having the first color generated in the active layer into a second color; and
a color filter corresponding to the inorganic light emitting diode and configured to absorb the light having the first color emitted from the inorganic light emitting diode.

### Claim 2 (depends on 1)

The display module according to claim 1, wherein
the color filter faces the light emitting surface of the inorganic light emitting diode.

### Claim 3 (depends on 1)

The display module according to claim 1, wherein the inorganic light emitting diode further comprises a dichroic filter configured to reflect light having the first color emitted through at least one from among the light emitting surface and the QD layer.

### Claim 4 (depends on 3)

The display module according to claim 3, wherein
the dichroic filter is on the light emitting surface and the QD layer.

### Claim 5 (depends on 1)

The display module according to claim 1, wherein
the QD layer is on the groove part and the light emitting surface.

### Claim 6 (depends on 1)

The display module according to claim 1, wherein
the grooves comprise a first groove and a second groove that is adjacent to the first groove.

### Claim 7 (depends on 6)

The display module according to claim 6, wherein
the light generated in the active layer and reflected by the light emitting surface passes through at least one from among the first groove and the second groove.

### Claim 8 (depends on 6)

The display module according to claim 6, further comprising
an optical clear resin (OCR) between the inorganic light emitting diode and the color filter,
wherein the first groove and the second groove satisfies the following relational formula:
g≤2d*tan(arcsin(n1/n2))
wherein g is an interval between the first groove and the second groove, d is a depth of the first groove and the second groove, n1 is a refractive index of the OCR, and n2 is a refractive index of the inorganic light emitting diode.

### Claim 9 (depends on 8)

The display module according to claim 8, wherein
the interval between the first groove and the second groove is smaller than 1.79 times the depth.

### Claim 10 (depends on 6)

The display module according to claim 6, further comprising:
air between the inorganic light emitting diode and the color filter,
wherein the first groove and the second groove satisfies the following relational formula:
g≤2d*tan(arcsin(n1/n2)
wherein g is an interval between the first groove and the second groove, d is a depth of the first groove and the second groove, n1 is a refractive index of the air, and n2 is a refractive index of the inorganic light emitting diode.

### Claim 11 (depends on 10)

The display module according to claim 10, wherein
the interval between the first groove and the second groove is smaller than 0.92 times the depth.

### Claim 12 (depends on 1)

The display module according to claim 1, wherein
the inorganic light emitting diode is a first inorganic light emitting diode configured to convert blue light into red light,
the color filter is a first color filter configured to absorb blue light emitted from the first inorganic light emitting diode, and
the display module further comprises:
a second inorganic light emitting diode spaced apart from the first inorganic light emitting diode and configured to convert blue light into green light;
a second color filter corresponding to the second inorganic light emitting diode and configured to absorb blue light emitted from the second inorganic light emitting diode;
a third inorganic light emitting diode spaced apart from the second inorganic light emitting diode and configured to emit blue light; and
a third color filter corresponding to the third inorganic light emitting diode and configured to transmit the blue light emitted from the third inorganic light emitting diode.

### Claim 13 (depends on 12)

The display module according to claim 12, further comprising
a black matrix between the first color filter and the second color filter and between the second color filter and the third color filter.

### Claim 14 (depends on 1)

The display module according to claim 1, wherein
the inorganic light emitting diode further comprises contact electrodes formed on an opposite side of the inorganic light emitting diode from the light emitting surface, and
the substrate comprises pad electrodes corresponding to the contact electrodes.

### Claim 15 (depends on 1)

The display module according to claim 1, wherein
the substrate comprises:
a substrate body; and
a thin film transistor (TFT) layer on the substrate body and configured to drive the inorganic light emitting diode.

### Claim 16

An inorganic light emitting diode comprising:
a first semiconductor comprising a light emitting surface;
a second semiconductor spaced apart from the first semiconductor;
an active layer between the first semiconductor and the second semiconductor and configured to generate light;
a groove part comprising a plurality of grooves recessed in the light emitting surface; and
a quantum dot (QD) layer inside the groove part,
wherein the QD layer is configured to convert a color of the light generated by the active layer from a first color to a second color.

### Claim 17 (depends on 16)

The inorganic light emitting diode according to claim 16, wherein
the inorganic light emitting diode further comprises a dichroic filter configured to reflect light having the first color emitted through at least one from among the light emitting surface and the QD layer.

### Claim 18 (depends on 17)

The inorganic light emitting diode according to claim 17, wherein
the dichroic filter is on the light emitting surface and the QD layer.

### Claim 19 (depends on 16)

The inorganic light emitting diode according to claim 16, wherein
the QD layer is on the groove part and the light emitting surface.

### Claim 20 (depends on 16)

The inorganic light emitting diode according to claim 16, wherein
the grooves comprise a first groove and a second groove that is adjacent to the first groove.