# US 12,009,384 B2 · Light emitting diode (LED) stack for a display

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- Number: US 12,009,384 B2
- Document ID: US12009384B2
- Status: Granted
- Kind: B2
- Application number: 17/366,462
- Filed: 2021-07-02
- Published: 2021-11-11
- Granted: 2024-06-11
- Earliest claimed: 2017-11-27
- Assignees: Seoul Viosys Co., Ltd.
- Applicants: Seoul Viosys Co., Ltd.
- Inventors: Jong Hyeon Chae; Chung Hoon Lee; Seong Gyu Jang; Chang Yeon Kim; Ho Joon Lee
- Web page: https://patentgrep.com/patent/US12009384B2

## CPC

- H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout}
- H10H 20/814: having reflecting means, e.g. semiconductor Bragg reflectors
- H10H 20/824: comprising only Group III-V materials, e.g. GaP
- H10H 20/835: {Reflective materials}
- H10H 20/8513: {having two or more wavelength conversion materials}
- H10W 90/00: Package configurations
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H10D 64/62: Electrodes ohmically coupled to a semiconductor
- H10D 86/40: characterised by multiple TFTs
- H10D 86/60: wherein the TFTs are in active matrices
- H10H 20/018: {Bonding of wafers}
- H10H 20/81: Bodies
- H10H 20/813: having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies
- H10H 20/82: Roughened surfaces, e.g. at the interface between epitaxial layers
- H10H 20/821: of the light-emitting regions, e.g. non-planar junctions
- H10H 20/831: characterised by their shape
- H10H 20/8312: {extending at least partially through the bodies}
- H10H 20/8314: {extending at least partially onto an outer side surface of the bodies}
- H10H 20/833: Transparent materials
- H10H 20/841: Reflective coatings, e.g. dielectric Bragg reflectors
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10H 20/856: Reflecting means
- H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/352: {the areas of the RGB subpixels being different}
- H10K 59/353: {characterised by the geometrical arrangement of the RGB subpixels}
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 2102/00: Constructional details relating to the organic devices covered by this subclass
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A light emitting diode (LED) stack for a display including a substrate, a first LED stack disposed on the substrate, a second LED stack disposed on the first LED stack, a third LED stack disposed on the second LED stack, a first color filter interposed between the first LED stack and the second LED stack, and a second color filter interposed between the second LED stack and the third LED stack, in which the second LED stack and the third LED stack are configured to transmit light generated from the first LED stack to the outside, and the third LED stack is configured to transmit light generated from the second LED stack to the outside.

## Claims

### Claim 1

A light emitting diode (LED) stack for a display, comprising:
a substrate;
a first LED stack disposed on the substrate;
a second LED stack disposed on the first LED stack;
a third LED stack disposed on the second LED stack;
a first color filter interposed between the first LED stack and the second LED stack; and
a second color filter interposed between the second LED stack and the third LED stack,
wherein the second LED stack and the third LED stack are configured to transmit light generated from the first LED stack to the outside,
wherein the third LED stack is configured to transmit light generated from the second LED stack to the outside, and
wherein the first color filter and the second color filter include insulation layers having different indices of refraction one above another.

### Claim 2 (depends on 1)

The light emitting diode stack of claim 1, wherein the first, second, and third LED stacks are configured to emit red light, green light, and blue light, respectively.

### Claim 3 (depends on 2)

The light emitting diode stack of claim 2, wherein the first color filter and the second color filter include at least one of a low pass filter, a band pass filter, and a band stop filter.

### Claim 4 (depends on 1)

The light emitting diode stack of claim 1, wherein the first color filter is configured to transmit light generated from the first LED stack, and reflect light generated from the second LED stack and the third LED stack.

### Claim 5 (depends on 1)

The light emitting diode stack of claim 1, wherein the second color filter is configured to transmit light generated from the first and second LED stacks, and reflect light generated from the third LED stack.

### Claim 6 (depends on 1)

The light emitting diode stack of claim 1, further comprising contact electrodes respectively contacting at least one of the first, second, and third LED stacks,
wherein the third LED stack has a plurality of sides, and
wherein one of the sides of the third LED stack overlaps a greater number of contact electrodes than the remaining sides of the third LED stack when viewed in plan.

### Claim 7

A light emitting diode (LED) stack for a display, comprising:
a substrate;
a first LED stack disposed on the substrate;
a second LED stack disposed on the first LED stack;
a third LED stack disposed on the second LED stack;
a first color filter interposed between the first LED stack and the second LED stack;
a second color filter interposed between the second LED stack and the third LED stack;
a first bonding layer interposed between the substrate and the first LED stack;
a second bonding layer interposed between the first color filter and the second LED stack; and
a third bonding layer interposed between the second LED stack and the second color filter,
wherein the second LED stack and the third LED stack are configured to transmit light generated from the first LED stack to the outside,
wherein the third LED stack is configured to transmit light generated from the second LED stack to the outside, and
wherein the second bonding layer and the third bonding layer are configured to transmit light generated from the first LED stack and the second LED stack.

### Claim 8 (depends on 7)

The light emitting diode stack of claim 7, wherein:
each of the first, second, and third LED stacks includes a first-type semiconductor layer and a second-type semiconductor layer; and
the light emitting diode stack further comprises:
a first lower electrode disposed between the first bonding layer and the first LED stack and in ohmic contact with the first-type semiconductor layer of the first LED stack;
a first upper electrode disposed between the first LED stack and the first color filter and in ohmic contact with the second-type semiconductor layer of the first LED stack;
a second electrode disposed between the second LED stack and the third bonding layer and in ohmic contact with the second-type semiconductor layer of the second LED stack, and
a third electrode disposed between the second color filter and the third LED stack and in ohmic contact with the second-type semiconductor layer of the third LED stack,
wherein the first upper electrode, the second electrode, and the third electrode are configured to transmit light generated from the first LED stack to the outside, and
wherein the second electrode and the third electrode are configured to transmit light generated from the second LED stack to the outside.

### Claim 9 (depends on 8)

The light emitting diode stack of claim 8, wherein the first lower electrode includes a reflective material, and the first upper electrode, the second electrode, and the third electrode include a transparent material.

### Claim 10

A display apparatus comprising:
a plurality of pixels arranged on a substrate, each pixel comprising:
a first light emitting diode (LED) stack disposed on the substrate;
a second LED stack disposed on the first LED stack;
a third LED stack disposed on the second LED stack;
a first color filter interposed between the first LED stack and the second LED stack, and configured to transmit light generated from the first LED stack and reflect light generated from the second LED stack; and
a second color filter interposed between the second LED stack and the third LED stack, and configured to transmit light generated from the first LED stack and the second LED stack and reflect light generated from the third LED stack,
wherein the second LED stack and the third LED stack are configured to transmit light generated from the first LED stack to the outside,
wherein the third LED stack is configured to transmit light generated from the second LED stack to the outside, and
wherein the first color filter and the second color filter include insulation layers having different indices of refraction one above another.

### Claim 11 (depends on 10)

The display apparatus of claim 10, wherein the first, second, and third LED stacks of each pixel are configured to be driven independently.

### Claim 12 (depends on 10)

The display apparatus of claim 10, wherein:
each of the first, second, and third LED stacks includes a first type semiconductor layer and a second-type semiconductor layer;
the second-type semiconductor layers of the first, second, and third LED stacks of each pixel are electrically connected to a common line; and
the first-type semiconductor layers of the first, second, and third LED stacks of each pixel are electrically connected to first lines different from the common line.

### Claim 13 (depends on 12)

The display apparatus of claim 12, wherein the common line comprises a data line and the first lines comprise scan lines.

### Claim 14 (depends on 12)

The display apparatus of claim 12, further comprising a reflective electrode disposed between the substrate and the first LED stack,
wherein the reflective electrode is continuously disposed over the plurality of pixels and comprises the common line.

### Claim 15 (depends on 12)

The display apparatus of claim 12, further comprising:
a first bonding layer interposed between the substrate and the first LED stack;
a second bonding layer interposed between the first LED stack and the second LED stack; and
a third bonding layer interposed between the second LED stack and the second color filter,
wherein the second bonding layer is configured to transmit light generated from the first LED stack, and
wherein the third bonding layer is configured to transmit light generated from the first and second LED stacks.

### Claim 16 (depends on 15)

The display apparatus of claim 15, wherein the first bonding layer, the second bonding layer, and the third bonding layer comprise at least one of a transparent inorganic insulating film, a transparent organic insulating film, and a transparent conductive thin film.

### Claim 17 (depends on 14)

The display apparatus of claim 14, wherein the third LED stack includes a roughened surface region on an upper surface thereof.

### Claim 18 (depends on 10)

The display apparatus of claim 10, wherein:
each pixel further comprises contact electrodes respectively contacting at least one of the first, second, and third LED stacks;
the third LED stack has a plurality of sides; and
one of the sides of the third LED stack overlaps a greater number of contact electrodes than the remaining sides of the third LED stack when viewed in plan.