Chip on flex

Patent metadata

Field	Value
Publication number	US-12530096-B2
Application number	US-202418747987-A
Country	US
Kind code	B2
Filing date	Jun 19, 2024
Priority date	Jun 27, 2019
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

The embodiments of the present disclosure provide a chip on flex (COF), a touch assembly, and a display device. The chip on flex includes a flexible base provided with a first opening, the flexible base includes a bonding area provided with a plurality of metal bonding pads; on the flexible base, a spacing area with a preset range is provided between the first opening and the bonding area; wherein, the flexible base is provided with a reinforcement sheet thereon, the reinforcement sheet is located on a portion of the flexible base other than the first opening, the spacing area and the bonding area.

First claim

What is claimed is:

1 . A chip on flex, comprising a flexible base provided with a first opening, the flexible base comprising a bonding area provided with a plurality of metal bonding pads; on the flexible base, a spacing area with a preset range being provided between the first opening and the bonding area; wherein, the flexible base is provided with a reinforcement sheet thereon, the reinforcement sheet is located on a portion of the flexible base other than the first opening, the spacing area and the bonding area, wherein the reinforcement sheet is made of steel;
wherein along a first direction, the width of the chip on flex at the bonding area is larger than the width of the chip on flex at a location corresponding to the first opening; wherein the reinforcement sheet is provided with a second opening, and an orthographic projection of the first opening on a plane where the reinforcement sheet is located is inside the second opening or coincides with edges of the first opening.

2 . The chip on flex according to claim 1 , wherein the reinforcement sheet is provided on a surface of the flexible base opposite to the display flexible circuit board.

3 . The chip on flex according to claim 1 , wherein the reinforcement sheet is provided at least along one edge of the first opening.

4 . The chip on flex according to claim 1 , wherein the plurality of metal bonding pads in the bonding area are arranged along the first direction, the first opening is provided on a side away from the bonding area along a second direction, the second direction is vertical to the first direction;
between the first opening and the bonding area, a size range of the preset range in the first direction is equal to a size range of the flexible base in the first direction, and a size range of the preset range in the second direction is a preset width range from the bonding area.

5 . The chip on flex according to claim 4 , wherein, in the second direction, a distance between the first opening and the bonding area is larger than a width value of the preset width range.

6 . The chip on flex according to claim 1 , wherein the metal bonding pads and the reinforcement sheet are located on a same surface of the flexible base.

7 . The chip on flex according to claim 1 , wherein the chip on flex further comprises a control chip which is located on a portion of the flexible base other than the first opening, the spacing area, the bonding area and the reinforcement sheet.

8 . The chip on flex according to claim 1 , wherein the reinforcement sheet is adhered and fixed to the flexible base.

9 . A chip on flex, comprising a flexible base provided with a first opening, the flexible base comprising a bonding area provided with a plurality of metal bonding pads; on the flexible base, a spacing area with a preset range being provided between the first opening and the bonding area; wherein, the flexible base is provided with a reinforcement sheet thereon, the reinforcement sheet is located on a portion of the flexible base other than the first opening, the spacing area and the bonding area, wherein the reinforcement sheet is made of steel;
wherein along a first direction, the width of the chip on flex at the bonding area is larger than the width of the chip on flex at a location corresponding to the first opening; wherein a bending area portion is formed between the first opening and the bonding area; and on a portion of the flexible base extending from the bonding area towards a second direction, a size range of the spacing area on the flexible base is larger than or equal to a size range of the bending area portion.

10 . The chip on flex according to claim 9 , wherein the reinforcement sheet is provided on a surface of the flexible base opposite to the display flexible circuit board.

11 . The chip on flex according to claim 9 , wherein the reinforcement sheet is provided at least along one edge of the first opening.

12 . The chip on flex according to claim 9 , wherein the reinforcement sheet is provided with a second opening, and an orthographic projection of the first opening on a plane where the reinforcement sheet is located is inside the second opening or coincides with edges of the first opening.

13 . The chip on flex according to claim 9 , wherein the plurality of metal bonding pads in the bonding area are arranged along the first direction, the first opening is provided on a side away from the bonding area along the second direction, the second direction is vertical to the first direction;
between the first opening and the bonding area, a size range of the preset range in the first direction is equal to a size range of the flexible base in the first direction, and a size range of the preset range in the second direction is a preset width range from the bonding area.

14 . The chip on flex according to claim 13 , wherein, in the second direction, a distance between the first opening and the bonding area is larger than a width value of the preset width range.

15 . The chip on flex according to claim 9 , wherein the metal bonding pads and the reinforcement sheet are located on a same surface of the flexible base.

16 . The chip on flex according to claim 9 , wherein the chip on flex further comprises a control chip which is located on a portion of the flexible base other than the first opening, the spacing area, the bonding area and the reinforcement sheet.

17 . The chip on flex according to claim 9 , wherein the reinforcement sheet is adhered and fixed to the flexible base.

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd

Inventors

• Gong Xuerui
• Wang Jiangsheng
• Yu Yong
• Zhang Chang

Classifications

• H05K2201/10128

  Display · CPC title

• H05K1/118

  specially for flexible printed circuits, e.g. using folded portions · CPC title

• H05K1/117

  Pads along the edge of rigid circuit boards, e.g. for pluggable connectors · CPC title

• H05K1/0281 Primary

  Reinforcement details thereof · CPC title

• G06F3/044

  by capacitive means · CPC title