Display device

Patent metadata

Field	Value
Publication number	US-11861097-B2
Application number	US-201916957443-A
Country	US
Kind code	B2
Filing date	Jul 8, 2019
Priority date	Jul 8, 2019
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

The present disclosure provides a display device including a display panel; a touch panel; a polarizer; a touch flexible printed circuit board, which includes a first portion, a second portion and a bending portion connecting the first portion and the second portion; a cover plate; a first adhesive layer; and a cushion layer, which is disposed between the first portion and the first adhesive layer. An orthographic projection of the polarizer on a reference plane falls outside an orthographic projection of the first portion on the reference plane, and the reference plane is a plane in which a touch surface of a touch panel is disposed. The polarizer and the first portion of the TFPC are arranged separately.

First claim

What is claimed is:

1. A display device, comprising:
a display panel;
a touch panel, disposed on a display side of the display panel;
a polarizer, disposed on a side, distal from the display panel, of the touch panel;
a touch flexible printed circuit board, comprising a first portion, a second portion and a bending portion connecting the first portion and the second portion; wherein the first portion is disposed on a side, distal from the display panel, of the touch panel, the second portion is disposed on a non-display side of the display panel, the first portion is provided with a first connection terminal, and the touch panel is provided with a second connection terminal, the first connection terminal being electrically connected to the second connection terminal;
a cover plate, disposed on a side, distal from the touch panel, of the polarizer;
a first adhesive layer, disposed between the cover plate and the polarizer; and
a cushion layer, disposed between the first portion and the first adhesive layer,
wherein an orthographic projection of the polarizer on a reference plane falls outside an orthographic projection of the first portion on the reference plane, and the reference plane is a plane in which a touch surface of the touch panel is disposed,
wherein the cushion layer comprises a polyethylene terephthalate PET substrate, and a first adhesive and a second adhesive that are stacked on both sides of the PET substrate.

2. The display device according to claim 1 , wherein the cushion layer has at least one feature selected from the group consisting of:
a surface, distal from the touch panel, of the cushion layer is substantially flush with a surface, distal from the touch panel, of the polarizer; or
an orthographic projection of the cushion layer on the reference plane substantially coincides with an orthographic projection of the first portion on the reference plane.

3. The display device according to claim 1 , wherein the orthographic projection of the polarizer on the reference plane comprises a notch, and an orthographic projection of the first portion on the reference plane is disposed within the notch.

4. The display device according to claim 1 , wherein a minimum spacing between the polarizer and the first portion is greater than or equal to 0.23 mm in a direction parallel to the reference plane.

5. The display device according to claim 1 , wherein the touch flexible printed circuit board comprises a first insulating layer, a first circuit layer, and a second insulating layer that are stacked in sequence along a direction distal from the touch panel;
wherein the first insulating layer comprises a first insulating portion and a second insulating portion; the first circuit layer comprises a first circuit portion, a second circuit portion, and a third circuit portion; and the second insulating layer comprises a third insulating portion, a fourth insulating portion, and a fifth insulating portion; and
the first portion comprises the first circuit portion and the third insulating portion; the second portion comprises the second insulating portion, the third circuit portion, and the fifth insulating portion; the bending portion comprises the first insulating portion, the second circuit portion, and the fourth insulating portion; the first insulating portion is made of a thermosetting ink, the thermosetting ink being a heat-set ink; and the first circuit unit comprises the first connection terminal.

6. The display device according to claim 5 , wherein the second insulating portion and the second insulating layer are both made of a second material, the second material comprising a composite material of polyimide and a pressure sensitive adhesive.

7. The display device according to claim 6 , wherein the first insulating portion comprises a target insulating pattern and a composite insulating pattern, and the second insulating portion and the composite insulating pattern are of an integral structure;
wherein the composite insulating pattern comprises a hollow-out portion, the target insulating pattern is disposed within the hollow-out portion of the composite insulating pattern; the target insulating pattern is made of the thermosetting ink, and the composite insulating pattern is made of the second material; and a thickness of the target insulating pattern is less than that of the composite insulating pattern.

8. The display device according to claim 7 , wherein the target insulating pattern comprises at least one of the following: a plurality of insulating blocks spaced apart along a bending direction of the bending portion; or a plurality of insulating blocks spaced apart along a direction of a bending axis of the bending portion.

9. The display device according to claim 5 , wherein the second portion comprises a first thickness region and a second thickness region; and the touch flexible printed circuit board further comprises a second circuit layer and a third insulating layer; wherein
a thickness of the first thickness region is greater than that of the second thickness region; and orthographic projections of boundary lines of the first thickness region and the second thickness region on the reference plane fall outside an orthographic projection of a display region of the display panel on the reference plane; and
the first thickness region comprises the second insulating portion, the third circuit portion, the fifth insulating portion, the second circuit layer, and the third insulating layer that are stacked in sequence along a direction distal from the display panel.

10. The display device according to claim 1 , further comprising at least one selected from the group consisting of:
a touch drive circuit, disposed on a side, proximal to the display panel, of the second portion and electrically connected to the second portion;
an insulating protective film, disposed on a side, distal from the display panel, of the second portion of the touch flexible printed circuit board; or
an ink layer, disposed between an edge region of the cover plate and the first adhesive layer.

11. The display device according to claim 1 , wherein the cover plate comprises a center region and an edge region; wherein
a thickness of the edge region gradually decreases in a direction distal from the center region; the edge region comprises a first subregion and a second subregion that are opposite to each other, and a third subregion and a fourth subregion that are opposite to each other; the center region is disposed between the first subregion and the second subregion and between the third subregion and the fourth subregion;
wherein an orthographic projection of a boundary line in which the first subregion is thinned on the reference plane falls outside an orthographic projection of the display region of the display panel on the reference plane; orthographic projections of boundary lines in which the second subregion, the third subregion, and the fourth subregion are thinned on the reference plane all fall within the orthographic projection of the display region on the reference plane and are proximal to an orthographic projection of an edge of the display region on the reference plane.

12. The display device according to claim 1 , wherein an edge of the touch panel is substantially flush with an edge of the cushion layer.

13. The display device according to claim 1 , further comprising a second adhesive layer, wherein the second adhesive layer is disposed between the display panel and the touch panel; and
the display panel comprises a polyethylene terephthalate PET tape and a buffer foam, wherein edges, proximal to the bending portion, of the second adhesi

Assignees

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

Inventors

• Wang Chao
• Feng Binfeng
• Li Fei
• Zhang Zijie
• Luo Yonghui

Classifications

• G06F3/04164 Primary

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• H05K1/189

  characterised by the use of flexible or folded printed circuits · CPC title

• G06F2203/04102

  Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper · CPC title

• H05K2201/10128

  Display · CPC title