# US 12,113,047 B2 · Ink leveling device and method of manufacturing display device using the same

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- Number: US 12,113,047 B2
- Document ID: US12113047B2
- Status: Granted
- Kind: B2
- Application number: 17/545,439
- Filed: 2021-12-08
- Published: 2022-07-14
- Granted: 2024-10-08
- Earliest claimed: 2021-01-08
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., LTD.
- Inventors: Jung Hyun Ahn; Buem Joon Kim; Won Ho Lee; Hyun Deok Im
- Web page: https://patentgrep.com/patent/US12113047B2

## CPC

- B41M 5/0023: {Digital printing methods characterised by the inks used (inks per se C09D11/00)}
- H10H 20/01: Manufacture or treatment
- H10W 90/00: Package configurations
- H10H 20/819: characterised by their shape, e.g. curved or truncated substrates
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10W 70/099: {Connecting interconnections to insulating or insulated package substrates, interposers or redistribution layers}
- H10W 72/0198: {batch processes}
- H10W 72/07163: {Means for mechanical processing, e.g. for planarising, pressing, stamping or drilling}
- H10W 72/07173: {Means for moving chips, wafers or other parts, e.g. conveyor belts}
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- 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

An ink leveling device includes a stage on which a target substrate is disposed, base frames disposed at sides of the stage, moving members coupled to the base frames and movable upward and downward, and at least one plate coupled to the moving members and disposed to press the target substrate. Light-emitting element ink is disposed on the target substrate.

## Claims

### Claim 1

An ink leveling device comprising:
a stage on which a target substrate is disposed, wherein light-emitting element ink is disposed on the target substrate;
base frames disposed at sides of the stage;
moving members coupled to the base frames and movable upward and downward; and
at least one plate coupled to the moving members and disposed to move relative to the target substrate and light-emitting element ink to press the target substrate.

### Claim 2 (depends on 1)

The ink leveling device of claim 1, wherein each of the moving members include:
a moving part coupled to each of the base frames; and
a fixing part coupled to the moving part and disposed to fix the at least one plate.

### Claim 3 (depends on 2)

The ink leveling device of claim 2, wherein the moving members move upward and downward in a length direction of the base frame.

### Claim 4 (depends on 1)

The ink leveling device of claim 1, wherein the at least one plate moves upward and downward according to movement of the moving members to press the target substrate.

### Claim 5 (depends on 1)

The ink leveling device of claim 1, wherein a size of the at least one plate is greater than a size of the target substrate.

### Claim 6 (depends on 1)

The ink leveling device of claim 1, wherein
the at least one plate is provided in plural, and
a size of each of the plurality of plates is smaller than a size of the target substrate.

### Claim 7 (depends on 6)

The ink leveling device of claim 6, wherein each of the moving members includes:
a moving part coupled to each of the base frames;
a supporting part coupled to the moving part and moving according to movement of the moving part; and
at least one fixing part extending from the supporting part and disposed to fix the at least one plate.

### Claim 8 (depends on 7)

The ink leveling device of claim 7, wherein
the at least one fixing part is provided in plural, and
the plurality of fixing parts are coupled to the plurality of plates, respectively.

### Claim 9

A method of manufacturing a display device, the method comprising:
disposing light-emitting element ink including light-emitting elements on a target substrate;
pressing the target substrate by moving a plate relative to the target substrate and the light-emitting element ink;
after pressing the target substrate, aligning the light-emitting elements by forming an electric field on the target substrate and irradiating ultraviolet light on the target substrate; and
after aligning the light-emitting elements, separating the plate from the target substrate.

### Claim 10 (depends on 9)

The method of claim 9, wherein
the light-emitting element ink includes a solvent and the light-emitting elements dispersed in the solvent, and
the disposing of the light-emitting element ink on the target substrate includes inkjet printing.

### Claim 11 (depends on 9)

The method of claim 9, wherein the target substrate includes first patterns formed in parallel, a first electrode and a second electrode disposed on the first patterns, a first insulating layer covering the first electrode and the second electrode, and second patterns disposed on the first insulating layer and that partition a predetermined area.

### Claim 12 (depends on 11)

The method of claim 11, wherein the aligning of the light-emitting elements includes:
generating the electric field by the first electrode and the second electrode; and
disposing end portions of each of the light-emitting elements on the first electrode and the second electrode, respectively, by use of the electric field.

### Claim 13 (depends on 11)

The method of claim 11, wherein the pressing of the target substrate includes:
moving a moving member downward to the target substrate such that a plate coupled to the moving member contacts the target substrate; and
pressing the target substrate and the light-emitting element ink by the plate.

### Claim 14 (depends on 13)

The method of claim 13, wherein
the plate contacts the second patterns of the target substrate and the light-emitting element ink, and
the light-emitting element ink is leveled between the second patterns by the pressing of the plate.

### Claim 15 (depends on 13)

The method of claim 13, wherein the separating of the plate from the target substrate includes moving the moving member upward to separate the plate coupled to the moving member from the target substrate.

### Claim 16 (depends on 13)

The method of claim 13, wherein
a size of the plate is greater than a size of the target substrate.

### Claim 17 (depends on 13)

The method of claim 13, wherein
a plurality of plates are coupled to the moving member, and
a total size of the plurality of plates is great than a size of the target substrate.

### Claim 18

A method of manufacturing a display device, the method comprising:
disposing light-emitting element ink including light-emitting elements on a target substrate;
sequentially pressing areas of the target substrate by moving a plate relative to the target substrate and light-emitting element ink;
separating the plate from the target substrate; and
after separating the plate from the target substrate, aligning the light-emitting elements by forming an electric field on the target substrate and irradiating ultraviolet light.

### Claim 19 (depends on 18)

The method of claim 18, wherein
a size of the plate is smaller than a size of the target substrate, and
the areas of the target substrate are sequentially pressed from one side of the target substrate to another side of the target substrate.

### Claim 20 (depends on 19)

The method of claim 19, wherein the aligning of the light-emitting elements is performed after the separating of the plate from the target substrate.