CN-121991550-A - Ink composition, electronic device, and method of manufacturing electronic device

Abstract

The application relates to an ink composition, an electronic device, and a method of manufacturing an electronic device. The ink composition may include a base resin, a photoinitiator, and a millbase including a pigment, a dispersant, and a (meth) acrylate monomer. The (meth) acrylate monomer includes a first monomer having a first viscosity and a second monomer having a second viscosity greater than the first viscosity, and thus the ink composition may have excellent dispersibility, storage stability, and processability.

Inventors

• Shen Yixie
• Shen Huifan
• LI XUANCHENG
• CAO GUIYUAN
• JIN LUNHUI
• Bai Chengrun
• JIN TAIJUN
• LI HAIFENG
• JIN SHOUZHEN
• Pu Yunxi
• XU DEZHONG
• SHEN DONGGEN

Assignees

• 三星显示有限公司
• 科恩托罗尼丝株式会社

Dates

Publication Date

20260508

Application Date

20251107

Priority Date

20241108

Claims (20)

1. 1. An ink composition comprising: A base resin; a photoinitiator, and A millbase comprising a pigment, a dispersant and a (meth) acrylate monomer, Wherein the (meth) acrylate monomer comprises: a first monomer having a first viscosity, and A second monomer having a second viscosity, wherein the second viscosity is greater than the first viscosity.
2. 2. The ink composition according to claim 1, Wherein, relative to 100 wt% of the total amount of the millbase, The millbase comprises: 5 wt% to 30% wt% of the pigment; 2 wt% to 10 wt% of said dispersant; 30 From about 45% to about wt% by weight of said first monomer, and 30 Wt% to 45 wt% of the second monomer.
3. 3. The ink composition of claim 1, wherein a difference between the first viscosity and the second viscosity is 100 cP to 5000 cP.
4. 4. The ink composition of claim 1, wherein the pigment comprises carbon black.
5. 5. The ink composition of claim 1, wherein the ink composition is free of solvent.
6. 6. The ink composition according to claim 1, Wherein the first monomer comprises 1, 6-hexanediol diacrylate, and The second monomer includes pentaerythritol tetraacrylate.
7. 7. The ink composition of claim 1, further comprising: a photopolymerizable monomer comprising two or more photopolymerizable functional groups; coupling agent, and An additive comprising at least one of an antistatic agent, a leveling agent, and an antifoaming agent.
8. 8. The ink composition according to claim 7, Wherein, relative to 100 wt% of the total amount of the ink composition, The ink composition includes: 25 From wt% to 60 wt% of the base resin; 5wt% to 15% wt% of the photoinitiator; 5wt% to 20% wt% of the millbase; 25 From wt% to 60 wt% of the photopolymerizable monomer; 0.5 to 3 wt% by weight of said coupling agent, and 0.2 Wt% to 4 wt% of said additive.
9. 9. The ink composition of claim 7, wherein the second monomer is the same as the photopolymerizable monomer.
10. 10. The ink composition of claim 1, wherein the base resin has a weight average molecular weight of 5000 to 50000.
11. 11. An electronic device, comprising: A display module; a light shielding layer under the display module, the light shielding layer being formed using the ink composition according to any one of claims 1 to 10, and A housing configured to house the display module.
12. 12. The electronic device according to claim 11, wherein the light shielding layer has a thickness of 9 μm to 16 μm.
13. 13. An electronic device according to claim 11, Wherein the display module comprises: a base layer, and A display element layer disposed on the base layer, the display element layer including a light emitting element, and Wherein the light shielding layer is disposed directly under the base layer.
14. 14. The electronic device of claim 11, wherein the light-shielding layer is a single layer formed using the ink composition.
15. 15. A method of manufacturing an electronic device, the method comprising: Providing a display module, and The ink composition according to any one of claims 1 to 10 is applied to a rear surface of the display module to form a light shielding layer.
16. 16. The method of claim 15, further comprising preparing the ink composition, Wherein the preparing of the ink composition comprises: Milling a mixture comprising the pigment, the dispersant, and the first monomer to form a first millbase composition; preparing a second millbase composition including the second monomer, and Mixing the first millbase composition and the first a secondary millbase composition to form the millbase.
17. 17. The method according to claim 15, Wherein the forming the light shielding layer includes: Applying the ink composition on the rear surface of the display module to form an initial light-shielding layer, and And photo-curing the initial shading layer.
18. 18. The method of claim 17, wherein the applying the ink composition to the rear surface of the display module is performed by a screen printing process.
19. 19. The method according to claim 15, Wherein the display module comprises: a base layer, and A display element layer disposed on the base layer, the display element layer including a light emitting element, and Wherein the light shielding layer is directly under the base layer.
20. 20. The method according to claim 19, Wherein the base layer comprises a glass substrate, Wherein the method further comprises etching a bottom surface of the base layer spaced apart from the display element layer before forming the light shielding layer, and Wherein the ink composition is applied to the etched bottom surface of the base layer at the time of the forming of the light shielding layer.

Description

Ink composition, electronic device, and method of manufacturing electronic device Cross Reference to Related Applications This patent application claims priority from korean patent application No. 10-2024-0157778, filed on 8 of 11 of 2024, the entire contents of which are incorporated herein by reference. Technical Field The present disclosure relates to an ink composition, an electronic device, and a method of manufacturing an electronic device, and more particularly, to an ink composition for forming a light shielding layer, an electronic device including a light shielding layer, and a method of manufacturing an electronic device. Background Various display devices for multimedia devices such as televisions, smart phones, tablet computers, and game consoles have been developed. The display device may be of a rigid type or a foldable, rollable or bendable flexible type allowing various shape changes. In various shapes of display devices, in order to improve display quality, a member for reducing reflection of external light is being used. However, in developing a member for improving reflection, it is necessary to absorb external light in a sufficient amount to exhibit excellent optical characteristics while ensuring excellent durability and reliability according to the use mode of the display device. Disclosure of Invention The present disclosure provides ink compositions having improved dispersibility, storage stability, and processability. The present disclosure also provides an electronic device including a light shielding layer having excellent light shielding characteristics, durability, and adhesion. The present disclosure also provides a method of manufacturing an electronic device with improved reliability and processability. Aspects of the present disclosure provide an ink composition including a base resin, a photoinitiator, and a millbase including a pigment, a dispersant, and a (meth) acrylate monomer, and the (meth) acrylate monomer includes a first monomer having a first viscosity and a second monomer having a second viscosity greater than the first viscosity. In one aspect, the millbase may include about 5 wt% to about 30 wt% pigment, about 2 wt% to about 10 wt% dispersant, about 30 wt% to about 45 wt% first monomer, and about 30 wt% to about 45 wt% second monomer, relative to a total of 100 wt% of the millbase. In one aspect, the difference between the first viscosity and the second viscosity may be about 100 cP to about 5000 cP. In one aspect, the pigment can include carbon black. In one aspect, the ink composition may be solvent-free. In one aspect, the first monomer may include 1, 6-hexanediol diacrylate and the second monomer may include pentaerythritol tetraacrylate. In one aspect, the ink composition may further include a photopolymerizable monomer including two or more photopolymerizable functional groups, a coupling agent, and an additive including at least one of an antistatic agent, a leveling agent (LEVELING AGENT), and an antifoaming agent. In one aspect, the ink composition may include about 25wt% to about 60 wt% of a base resin, about 5wt% to about 15 wt% of a photoinitiator, about 5wt% to about 20 wt% of a millbase, about 25wt% to about 60 wt% of a photopolymerizable monomer, about 0.5wt% to about 3 wt% of a coupling agent, and about 0.2 wt% to about 4 wt% of an additive, relative to a total amount of 100 wt% of the ink composition. In one aspect, the second monomer may be the same as the photopolymerizable monomer. In one aspect, the base resin may have a weight average molecular weight of about 5000 to about 50000. In aspects of the present disclosure, an electronic device includes a display module, a light shielding layer disposed under the display module and formed using an ink composition, and a case accommodating the display module. In one aspect, the light shielding layer may have a thickness of about 9 μm to about 16 μm. In an aspect, the display module may include a base layer and a display element layer disposed on the base layer and including a light emitting element, and the light shielding layer is disposed directly under the base layer. In one aspect, the light-shielding layer may be a single layer formed using the ink composition. In aspects of the present disclosure, a method of manufacturing an electronic device includes providing a display module, and providing an ink composition on a rear surface of the display module to form a light shielding layer. In one aspect, the method of making an electronic device can further include preparing an ink composition, which can include milling a mixture including a pigment, a dispersant, and a first monomer to prepare a first millbase composition, preparing a second millbase composition including a second monomer, and mixing the first millbase composition and the second millbase composition to prepare a millbase. In one aspect, forming the light shielding layer may include providing an ink composition on a rear surface