Anisotropic conductive film including liquid metal, method for manufacturing the same and display device using the same

Patent metadata

Field	Value
Publication number	US-12550435-B2
Application number	US-202217743309-A
Country	US
Kind code	B2
Filing date	May 12, 2022
Priority date	May 13, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

The present disclosure relates to an anisotropic conductive film capable of electrode bonding even at a low temperature and maintaining excellent conductivity and flexibility, a manufacturing method thereof, and a display device using the same. The anisotropic conductive film contains conductive microcapsules including a liquid metal in a binder layer.

First claim

The invention claimed is:

1 . A display device, comprising:
a display panel comprising display area pixels that are disposed and a non-display area; a plurality of pad electrodes disposed in the non-display area, and directly connected to the display panel; a flexible substrate comprising a plurality of wiring electrodes and a driving integrated circuit; and an anisotropic conductive film which is interposed between the display panel and the flexible substrate and electrically connects the pad electrode and the wiring electrode, wherein: the plurality of pad electrodes are separated from each other and the plurality of wiring electrodes are separated from each other; and the entire region of the pad electrodes overlaps the entire region of the wiring electrodes in the thickness direction.

2 . The display device of claim 1 , wherein:
the anisotropic conductive film comprises a binder layer containing a plurality of conductive microcapsules; and the conductive microcapsules comprise a liquid metal consisting of gallium (Ga) or at least one gallium-based alloy.

3 . The display device of claim 2 , wherein the liquid metal consists of at least one gallium-based alloy selected from the group consisting of a Ga—In alloy, a Ga—In—Sn alloy, and a Ga—In—Sn—Zn alloy.

4 . The display device of claim 2 , wherein the binder layer further comprises an adhesive material having a self-healing ability.

5 . The display device of claim 4 , wherein the adhesive material is a hydrogel comprising gelatin.

6 . The display device of claim 2 , wherein the diameter of the microcapsules is between 100 nm and 100 μm.

7 . The anisotropic conductive film of claim 2 , wherein each microcapsule has a diameter between 100 nm and 900 μm.

8 . The display device of claim 2 , wherein the conductive microcapsules are regularly arranged within the binder layer at regular intervals along first and second directions which are orthogonal to each other in a planar manner.

9 . The display device of claim 8 , wherein the conductive microcapsules are regularly arranged at the regular intervals in rows and columns along the first and second directions.

10 . The display device of claim 2 , wherein the conductive microcapsules are distributed at different densities along a thickness direction of the binder layer.

11 . The display device of claim 2 , wherein the conductive microcapsules are uniformly dispersed with a first density at a lower portion of the binder layer adjacent to the display panel, and the conductive microcapsules are dispersed with a second density at an upper portion of the binder layer adjacent to the flexible substrate, such that the second density is less than the first density.

Assignees

• Lg Display Co Ltd
• Yonsei Univ Industry Academic Cooperation Foundation

Inventors

• Park Jang-Ung
• Kim Harkjin
• Ji Kwanghwan
• Kim Hyobeom
• Park Younggeun

Classifications

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• G09F9/301

  flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED · CPC title

• C09J2301/408

  additives as essential feature of the adhesive layer · CPC title

• H01B5/14 Primary

  comprising conductive layers or films on insulating-supports · CPC title

• H01B1/22 Primary

  the conductive material comprising metals or alloys · CPC title