# US 2021/0280753 A1 · Display device and method of manufacturing the same

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- Number: US 2021/0280753 A1
- Document ID: US20210280753A1
- Status: Published application
- Kind: A1
- Application number: 17/258,145
- Filed: 2018-09-20
- Published: 2021-09-09
- Earliest claimed: 2018-07-06
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Dae Hyun KIM; Hyun Min CHO; Keun Kyu SONG; Je Won YOO; Bek Hyun LIM; Sung Chan JO
- Web page: https://patentgrep.com/patent/US20210280753A1

## CPC

- H10H 20/01: Manufacture or treatment
- H10H 20/853: characterised by their shape
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10W 90/00: Package configurations
- H10H 20/0364: {of interconnections}
- H10H 20/819: characterised by their shape, e.g. curved or truncated substrates
- H10H 20/854: characterised by their material, e.g. epoxy or silicone resins
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A display device and method of manufacturing a display device. The display device includes a first electrode, a second electrode facing the first electrode, a first insulating layer on the first electrode and the second electrode and between the first electrode and the second electrode, a light emitting element on the first insulating layer, a second insulating layer covering the light emitting element and exposing end portions of the light emitting element, a third insulating layer on the second insulating layer, a first contact electrode electrically connected to the first electrode, on the third insulating layer and in contact with a first end portion of the light emitting element exposed by the second insulating layer, and a second contact electrode electrically connected to the second electrode, on the third insulating layer and in contact with a second end portion of the light emitting element exposed by the second insulating layer.

## Claims

### Claim 1

A display device comprising:
a first electrode;
a second electrode facing the first electrode;
a first insulating layer on the first electrode and the second electrode and positioned between the first electrode and the second electrode;
a light emitting element on the first insulating layer;
a second insulating layer covering the light emitting element and exposing first and second end portions of the light emitting element;
a third insulating layer on the second insulating layer;
a first contact electrode electrically connected to the first electrode, the first contact electrode being on the third insulating layer and in contact with the first end portion of the light emitting element exposed by the second insulating layer; and
a second contact electrode electrically connected to the second electrode, the second contact electrode being on the third insulating layer and in contact with a second end portion of the light emitting element exposed by the second insulating layer.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the first contact electrode and the second contact electrode are opposed to each other and separated from each other, and
wherein the display device further comprises a fourth insulating layer covering the first contact electrode and the second contact electrode, the fourth insulating layer being in a region where the first contact electrode and the second contact electrode are separated from each other.

### Claim 3 (depends on 2)

The display device of claim 2, wherein the third insulating layer covers first and second side surfaces of the second insulating layer.

### Claim 4 (depends on 3)

The display device of claim 3, wherein at least a part of each of the first contact electrode and the second contact electrode is in contact with an upper surface of the third insulating layer, and
wherein an end portion of each of the first contact electrode and the second contact electrode in a mutually opposing direction is on the upper surface of the third insulating layer.

### Claim 5 (depends on 4)

The display device of claim 4, wherein the first contact electrode and the second contact electrode are on substantially a same plane.

### Claim 6 (depends on 5)

The display device of claim 5, wherein respective first surfaces of the first contact electrode and the second contact electrode in contact with a side surface of the third insulating layer are aligned with respective second surfaces of the first contact electrode and the second contact electrode in contact with the light emitting element.

### Claim 7 (depends on 5)

The display device of claim 5, wherein respective first surfaces of the first contact electrode and the second contact electrode in contact with a side surface of the third insulating layer are recessed toward a center of the light emitting element from respective second surfaces of the first contact electrode and the second contact electrode in contact with the light emitting element.

### Claim 8 (depends on 6)

The display device of claim 6, wherein a lower surface of the light emitting element is at least partially opposed to the first insulating layer and separated from the first insulating layer by a separation space, and an organic filler made of a same material as the third insulating layer is partially filled in the separation space between the lower surface of the light emitting element and the first insulating layer.

### Claim 9 (depends on 8)

The display device of claim 8, wherein the first contact electrode is in partial contact with the organic filler.

### Claim 10 (depends on 9)

The display device of claim 9, wherein the light emitting element has a cylindrical shape, and wherein a part of the lower surface of the light emitting element is in direct contact with the first insulating layer.

### Claim 11 (depends on 1)

The display device of claim 1, further comprising a fifth insulating layer covering an upper surface of the first contact electrode and in contact with a lower surface of the second contact electrode.

### Claim 12 (depends on 11)

The display device of claim 11, further comprising a passivation layer covering an upper surface of each of the second contact electrode and the fifth insulating layer.

### Claim 13 (depends on 12)

The display device of claim 12, wherein one side portion of the second contact electrode facing the first contact electrode is disposed on the fifth insulating layer, and
wherein one side portion of the first contact electrode facing the second contact electrode is below the fifth insulating layer.

### Claim 14 (depends on 13)

The display device of claim 13, wherein one side surface of the fifth insulating layer in contact with the second contact electrode is aligned with one side surface of the third insulating layer in contact with the second contact electrode.

### Claim 15 (depends on 14)

The display device of claim 14, wherein a lower surface of the light emitting element is at least partially opposed to the first insulating layer and separated from the first insulating layer by a separation space, and an organic filler made of a same material as the third insulating layer is partially filled in the separation space between the lower surface of the light emitting element and the first insulating layer.

### Claim 16 (depends on 15)

The display device of claim 15, wherein the first contact electrode is in partial contact with the organic filler.

### Claim 17 (depends on 16)

The display device of claim 16, wherein the first end portion of the light emitting element includes a semiconductor material with n-type conductivity, and the second end portion of the light emitting element includes a semiconductor material with p-type conductivity, and
wherein an active material layer is disposed between the first end portion and the second end portion.

### Claim 18

A method of manufacturing a display device, the method comprising:
providing a substrate including a first electrode, a second electrode facing the first electrode, a first insulating layer on the first electrode and the second electrode and positioned between the first electrode and the second electrode, and a light emitting element on the first insulating layer;
sequentially forming an inorganic insulating layer and an organic insulating layer on the substrate; and
patterning the organic insulating layer and the inorganic insulating layer to form a third insulating layer and a second insulating layer covering the light emitting element and exposing a first end portion of the light emitting element.

### Claim 19 (depends on 18)

The method of claim 18, further comprising, after forming the third insulating layer and the second insulating layer, forming a first contact electrode which is electrically connected to the first electrode, on the third insulating layer, and in contact with the first end portion of the light emitting element exposed by the second insulating layer.

### Claim 20 (depends on 19)

The method of claim 19, further comprising forming a fourth insulating layer which is disposed to cover the first contact electrode, covers one surface of the third insulating layer facing the second electrode, and exposes a second end portion opposite to the first end portion of the light emitting element.

### Claim 21 (depends on 20)

The method of claim 20, further comprising forming a second contact electrode which is electrically connected to the second electrode, on the second passivation layer, and in contact with the second end portion of the light emitting element exposed by the fourth insulating layer.

### Claim 22 (depends on 21)

The method of claim 21, further comprising forming a fifth insulating layer covering the second contact electrode and the third insulating layer.

### Claim 23 (depends on 22)

The method of claim 22, wherein a lower surface of the light emitting element is at least partially opposed to and separated from the first insulating layer, and the forming the third insulating layer comprises partially filling an organic filler made of the same material as the third insulating layer in the separation space between the lower surface of the light emitting element and the first insulating layer.

### Claim 24 (depends on 23)

The method of claim 23, wherein the patterning the inorganic insulating layer comprises dry etching the inorganic insulating layer.

### Claim 25 (depends on 18)

The method of claim 18, wherein the forming the third insulating layer and the second insulating layer comprises exposing a second end portion opposite to the first end portion of the light emitting element.

### Claim 26 (depends on 25)

The method of claim 25, further comprising forming a third contact electrode which is electrically connected to the first electrode, on the organic insulating layer and in contact with a first end portion of the light emitting element exposed by the second insulating layer, and a fourth contact electrode which is electrically connected to the second electrode, on the organic insulating layer and in contact with the second end portion of the light emitting element exposed by the second insulating layer.

### Claim 27 (depends on 26)

The method of claim 26, wherein the third contact electrode and the fourth contact electrode are patterned in the same process.

### Claim 28 (depends on 27)

The method of claim 27, wherein a lower surface of the light emitting element is at least partially opposed to and separated from the first insulating layer, and the forming an organic insulating layer comprises partially filling an organic filler made of a same material as the third insulating layer in the separation space between the lower surface of the light emitting element and the first insulating layer.

### Claim 29 (depends on 28)

The method of claim 28, wherein the patterning the inorganic insulating layer comprises dry etching the inorganic insulating layer.

### Claim 30 (depends on 7)

The display device of claim 7, wherein a lower surface of the light emitting element is at least partially opposed to the first insulating layer and separated from the first insulating layer by a separation space, and an organic filler made of a same material as the third insulating layer is partially filled in the separation space between the lower surface of the light emitting element and the first insulating layer.

### Claim 31 (depends on 30)

The display device of claim 30, wherein the first contact electrode is in partial contact with the organic filler.

### Claim 32 (depends on 31)

The display device of claim 31, wherein the light emitting element has a cylindrical shape, and wherein a part of the lower surface of the light emitting element is in direct contact with the first insulating layer.