# US 2025/0098412 A1 · Method for preparing pixel define layer

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- Number: US 2025/0098412 A1
- Document ID: US20250098412A1
- Status: Published application
- Kind: A1
- Application number: 18/891,856
- Filed: 2024-09-20
- Published: 2025-03-20
- Earliest claimed: 2023-09-20
- Assignees: Duk San Neolux Co., Ltd.
- Applicants: Duk San Neolux Co., Ltd.
- Inventors: Hye Jung CHOI; Jun Ki KIM; Kyung Soo KIM; Changmin LEE; Yeon Soo LEE; Jun BAE; Hanwook SEO; Seo Jeong JEON; Soung Yun MUN
- Web page: https://patentgrep.com/patent/US20250098412A1

## CPC

- H10K 59/1201: {Manufacture or treatment}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour
- H10K 85/111: {comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Provided is a method for ensuring vivid colors and increasing display reliability and lifespan by implementing a colored pattern with high optical density on an electrode substrate, where the method uses a pigment dispersion in which a pigment having a size of 100 nm or less is used in order to increase the optical density and reduce roughness after completing the post-heat treatment process by including a colorant according to the present disclosure, and the method can minimize the reduction in the lifespan due to moisture in the panel state by minimizing the moisture content after completing the post-heat treatment process.

## Claims

### Claim 1

A method for preparing a pixel defining layer, the method comprising steps of: applying and coating a photosensitive resin composition; performing prebaking; performing exposure; performing development; and performing post-heat treatment, wherein the coating film after the post-heat treatment step has a moisture content of 50 ppm or less, has an optical density (OD) of 0.8 to 1.5/μm, and has a reflectivity of more than 0.01% to less than 6.5%.

### Claim 2 (depends on 1)

The method of claim 1, wherein the coating film after the post-heat treatment step has a reflectivity of more than 0.01% to 6.3% or less.

### Claim 3 (depends on 1)

The method of claim 1, wherein the coating film after the post-heat treatment step has an optical density (OD) of 0.83 to 1.4/μm.

### Claim 4 (depends on 1)

The method of claim 1, wherein the coating film after the post-heat treatment step has an optical density (OD) of 0.9 to 1.3/μm.

### Claim 5 (depends on 1)

The method of claim 1, wherein the oven temperature of the post-heat treatment step is 250 to 270° C.

### Claim 6 (depends on 1)

The method of claim 1, wherein the post-heat treatment step is performed for 60 to 120 minutes.

### Claim 7 (depends on 1)

The method of claim 1, wherein the photosensitive resin composition contains a colorant.

### Claim 8 (depends on 7)

The method of claim 7, wherein the colorant is contained in an amount of 1 to 40% by weight based on the total amount of the photosensitive resin composition.

### Claim 9 (depends on 7)

The method of claim 7, wherein the colorant includes one or more of an inorganic dye, an organic dye, an inorganic pigment, and an organic pigment.

### Claim 10 (depends on 7)

The method of claim 7, wherein the colorant is pretreated using: a dispersant; or a water-soluble inorganic salt and a wetting agent.

### Claim 11 (depends on 1)

The method of claim 1, wherein the photosensitive resin composition contains a patterning resin which includes an acrylic binder resin, a cardo-based binder resin, or a combination thereof.

### Claim 12 (depends on 11)

The method of claim 11, wherein the acrylic binder resin has a weight average molecular weight of 3,000 g/mol to 150,000 g/mol.

### Claim 13 (depends on 11)

The method of claim 11, wherein the cardo-based binder resin includes a repeating structure of the following Formula 1:
in Formula 1,
1) R1 and R2 are each independently hydrogen; deuterium; a halogen; a C6-C30 aryl group; a C2-C30 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P; a fused ring group of a C6-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C20 alkoxy group; a C6-C30 aryloxy group; a fluorenyl group; a carbonyl group; an ether group; or a C1-C20 alkoxycarbonyl group,
2) R1 and R2 can form a ring between neighboring groups,
3) m and n are each independently an integer of 0 to 4,
4) A1 and A2 are each independently Formula 2 or Formula 3 below,
in Formula 2 and Formula 3,
4-1)*indicates a connection part,
4-2) R3 to R6 are each independently hydrogen; deuterium; a halogen; a C6-C30 aryl group; a C2-C30 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P; a fused ring group of a C6-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C20 alkoxy group; a C6-C30 aryloxy group; a fluorenyl group; a carbonyl group; an ether group; or a C1-C20 alkoxycarbonyl group,
4-3) R3 to R6 can form a ring between neighboring groups,
4-4) Y1 and Y2 are each independently Formula 6 or Formula 7 below,
in Formula 6 and Formula 7,
4-4-1)*indicates a binding position,
4-4-2) R9 is hydrogen or methyl,
4-4-3) R10 to R13 are each independently hydrogen; deuterium; a halogen; a C6-C30 aryl group; a C2-C30 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P; a fused ring group of a C6-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C20 alkoxy group; a C6-C30 aryloxy group; a fluorenyl group; a carbonyl group; an ether group; or a C1-C20 alkoxycarbonyl group,
4-4-4) L1 to L3 are each independently a single bond; a fluorenylene group; C2-C30 alkylene; C6-C30 arylene; C2-C30 heterocycle; C1-C30 alkoxylene; C2-C30 alkyleneoxy; a C6-C30 aryloxy group; or a C2-C30 polyethyleneoxy group,
4-4-5) q and r are each independently an integer of 0 to 3, with the proviso that q+r=3, and
5) the ratio of A1 and A2 in the polymer chain of the resin including a repeating unit represented by Formula 1 is 9:1 to 1:9,
6) X1 is a single bond; O; CO; SO2; CR′R″; SiR′R″; Formula 4 below; or Formula 5 below,
6-1) R′ and R″ are each independently hydrogen; deuterium; a halogen; a C6-C30 aryl group; a C2-C30 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P; a fused ring group of a C6-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C20 alkoxy group; a C6-C30 aryloxy group; a fluorenyl group; a carbonyl group; an ether group; or a C1-C20 alkoxycarbonyl group,
6-2) R′ and R″ can form a ring between adjacent groups,
in Formula 4 and Formula 5,
6-3)*indicates a binding position,
6-4) R7 and R8 are each independently hydrogen; deuterium; a halogen; a C6-C30 aryl group; a C2-C30 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P; a fused ring group of a C6-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C20 alkoxy group; a C6-C30 aryloxy group; a fluorenyl group; a carbonyl group; an ether group; or a C1-C20 alkoxycarbonyl group,
6-5) o and p are each independently an integer of 0 to 4,
7) X2 is a C6-C30 aryl group; a C2-C30 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P; a fused ring group of a C6-C30 aliphatic ring and a C6-C30 aromatic ring; a C1-C20 alkyl group; a C2-C20 alkenyl group; a C2-C20 alkynyl group; a C1-C20 alkoxy group; a C6-C30 aryloxy group; a fluorenylene group; a carbonyl group; an ether group; or a C1-C20 alkoxycarbonyl group, and
8) R′, R″, X2, L1 to L3, R1 to R8, and R10 to R13 can each be further substituted with one or more substituents selected from the group consisting of deuterium; a halogen; a silane group substituted or unsubstituted with a C1-C30 alkyl group or C6-C30 aryl group; a siloxane group; a boron group; a germanium group; a cyano group; an amino group; a nitro group; a C1-C30 alkylthio group; a C1-C30 alkoxy group; a C6-C30 arylalkoxy group; a C1-C30 alkyl group; a C2-C30 alkenyl group; a C2-C30 alkynyl group; a C6-C30 aryl group; a C6-C30 aryl group substituted with deuterium; a fluorenyl group; a C2-C30 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si, and P; a C3-C30 alicyclic group;
a C7-C30 arylalkyl group; a C8-C30 arylalkenyl group; and combinations thereof, and can form a ring between adjacent substituents.

### Claim 14 (depends on 11)

The method of claim 11, wherein the cardo-based resin has a weight average molecular weight of 1,000 to 100,000 g/mol.

### Claim 15 (depends on 11)

The method of claim 11, wherein the cardo-based resin is contained in an amount of 1 to 30% by weight based on the total amount of the photosensitive resin composition.

### Claim 16 (depends on 1)

The method of claim 1, wherein the photosensitive resin composition contains a reactive unsaturated compound in an amount of 1 to 40% by weight based on the total amount of the photosensitive resin composition.

### Claim 17 (depends on 1)

The method of claim 1, wherein the photosensitive resin composition contains a photoinitiator in an amount of 0.01 to 10% by weight based on the total amount of the photosensitive resin composition.

### Claim 18 (depends on 1)

A pixel defining layer prepared by the preparation method according to claim 1.

### Claim 19 (depends on 18)

An organic light emitting display device comprising the pixel defining layer according to claim 18.

### Claim 20 (depends on 19)

An electronic device comprising the display device of claim 19 and a control unit for driving the display device.