# US 2025/0098436 A1 · Ink containing organic material, display device using the same, and method of manufacturing display device

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- Number: US 2025/0098436 A1
- Document ID: US20250098436A1
- Status: Published application
- Kind: A1
- Application number: 18/968,531
- Filed: 2024-12-04
- Published: 2025-03-20
- Earliest claimed: 2020-06-11
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Dongha Lee; Donghoon Kwak; Dukki Kim; Sehun Kim; Seoksoon Back
- Web page: https://patentgrep.com/patent/US20250098436A1

## CPC

- H10K 71/135: {using ink-jet printing}
- C09D 11/30: Inkjet printing inks
- C09K 11/06: containing organic luminescent materials
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 85/141: {comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 59/1201: {Manufacture or treatment}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

An ink for a display device, the ink includes: an organic material, wherein the organic material has a molecular weight greater than about 500 and less than about 1,000,000, and the organic material in the ink has a concentration and the molecular weight of the organic material satisfy: y < - 3.518 * ln ⁡ ( x ) + 4 ⁢ 5 . 5 ⁢ 9 , wherein y is the concentration of the organic material, and x is the molecular weight of the organic material.

## Claims

### Claim 1

An ink for a display device, the ink comprising:
an organic material, wherein
the organic material has a molecular weight greater than about 500 and less than about 1,000,000, and
the organic material in the ink has a concentration and the molecular weight of the organic material satisfy:
y
<
-
3.518
*
ln
⁡
(
x
)
+
4
⁢
5
.59
,
wherein y is the concentration of the organic material, and x is the molecular weight of the organic material.

### Claim 2 (depends on 1)

The ink of claim 1, wherein the molecular weight of the organic material is greater than about 500 and less than about 400,000.

### Claim 3 (depends on 1)

The ink of claim 1, wherein the ink has an Ohnesorge number of less than about 1.

### Claim 4 (depends on 1)

The ink of claim 1, wherein viscosity of the ink is less than or equal to about 25 cP.

### Claim 5

A display device comprising:
a substrate;
a pixel electrode disposed on the substrate;
a bank layer disposed on the pixel electrode, the bank layer including an opening exposing at least part of the pixel electrode; and
an intermediate layer overlapping the opening and comprising an organic material,
wherein the intermediate layer is disposed on the pixel electrode at least partially exposed by the bank layer,
the organic material has a molecular weight greater than about 500 and less than about 1,000,000, and
the organic material comprises ink having a concentration and the molecular weight of the organic material satisfy:
y
<
-
3.518
*
ln
⁡
(
x
)
+
4
⁢
5
.59
,
wherein y is the concentration of the organic material, and x is the molecular weight of the organic material.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the molecular weight of the organic material is greater than about 500 and less than about 400,000.

### Claim 7 (depends on 5)

The display device of claim 5, wherein the ink has an Ohnesorge number of less than about 1.

### Claim 8 (depends on 5)

The display device of claim 5, wherein viscosity of the ink is less than or equal to about 25 cP.

### Claim 9 (depends on 5)

The display device of claim 5, wherein an upper surface of the bank layer has liquid repellency.

### Claim 10 (depends on 5)

The display device of claim 5, wherein an upper surface and a lateral surface of the bank layer have liquid repellency.

### Claim 11 (depends on 5)

The display device of claim 5, wherein the bank layer comprises a fluorine resin.

### Claim 12 (depends on 5)

The display device of claim 5, wherein the bank layer comprises a negative photoresist.

### Claim 13 (depends on 5)

The display device of claim 5, wherein the intermediate layer is disposed in an opening of the bank layer.

### Claim 14 (depends on 5)

The display device of claim 5, further comprising an opposite electrode disposed on the intermediate layer.

### Claim 15 (depends on 14)

The display device of claim 14, wherein the opposite electrode covers the intermediate layer and the bank layer.