Display panel and display device

Patent metadata

Field	Value
Publication number	US-12495488-B2
Application number	US-202217681147-A
Country	US
Kind code	B2
Filing date	Feb 25, 2022
Priority date	Mar 25, 2020
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

A display panel and a display device. The display panel includes: a substrate layer, a flexible screen body, an adhesive layer and a touch control layer that are stacked in order. Each of the substrate layer, the flexible screen body, the adhesive layer and the touch control layer has a particular film/layer thickness. At least part of the adhesive layer is configured as a neutral layer of the display panel. Both the substrate layer and the flexible screen body are subject to a compressive stress when the display panel is bent. The touch control layer is subject to a tensile stress when the display panel is bent.

First claim

What is claimed is:

1 . A display panel, comprising: a substrate layer, a flexible screen body, an adhesive layer and a touch control layer that are stacked in order, wherein:
the flexible screen body is abutting the substrate layer, the adhesive layer is abutting the flexible screen body, and the touch control layer is abutting a top of the adhesive layer, the adhesive layer is located between the flexible screen body and the touch control layer, wherein the adhesive layer is solid and optically transparent, wherein the adhesive layer comprises a graphical base layer and a graphical link layer, an orthographic projection of the graphical base layer on the flexible screen body and an orthographic projection of the graphical link layer on the flexible screen body are non-overlapping, and the graphical base layer has a height different from a height of the graphical link layer in a thickness direction of the display panel, the substrate layer and the flexible screen body are made with materials that are configured to be under a compressive stress when the display panel is bent, and the touch control layer is configured to be under a tensile stress when the display panel is bent; the graphical base layer is of an S-type, and wherein the graphical base layer and the graphical link layer are arranged in an interdigitated manner.

2 . The display panel according to claim 1 , further comprising a bearing layer disposed on a side of the substrate layer away from the flexible screen body, a side of the bearing layer away from the substrate layer being provided with at least one groove;
wherein the display panel is foldable along at least one folding line, the at least one folding line are positioned on both sides of a centerline of the display panel and symmetrically arranged about the centerline, and the at least one groove is arranged at positions of the at least one folding line respectively.

3 . The display panel according to claim 2 , wherein a ratio of a depth of the least one groove and a thickness of the bearing layer ranges from 1/3 to 1/2.

4 . The display panel according to claim 2 , wherein:
each of the at least one groove includes a central sub-groove and side sub-grooves evenly provided on both sides of the central sub-groove; at least one side groove of the side sub-grooves has a depth equal to a width of an opening of the at least one groove; the central sub-groove has a depth greater than a depth of each of the side sub-grooves; and the at least one groove has a cross-sectional shape of one of a triangle, a fillet triangle, and a fillet rectangle.

5 . The display panel according to claim 2 , wherein each of the least one groove comprises a central sub-groove, and at least two side sub-grooves provided on both sides of the central sub-groove, forming a groove set distributed in an edge region of the display panel; and
the central sub-groove has a depth greater than a depth of each of the at least two side sub-grooves; each of the central sub-groove and the at least two side sub-grooves has a cross-section shape of a combination of a triangle and a rectangle, with the triangle located on a side of the rectangle facing the flexible screen body; one of the at least one folding line extends through the central sub-groove and overlaps with a vertex of the triangle away from the rectangle.

6 . The display panel according to claim 2 , wherein:
the bearing layer has a thickness of 10 μm to 120 μm, a Poisson's ratio of 0.05 to 0.75, and a Young's modulus of 0.02 GPa to 10 GPa; and/or the adhesive layer has a thickness of 80 μm to 120 μm, a Poisson's ratio of 0.2 to 0.5, and a Young's modulus of 0.0002 GPa to 0.001 GPa, and a material of the adhesive layer is pressure sensitive adhesive, optically clear adhesive or optically clear resin.

7 . The display panel according to claim 1 , further comprising:
a support film disposed on a side of the substrate layer away from the flexible screen body, and a bearing film disposed on a side of the support film away from the substrate layer; wherein at least one first groove is provided on a side of the support film away from the substrate layer and at least one second groove is provided on a side of the bearing film away from the support film.

8 . The display panel according to claim 7 , wherein
a ratio of a depth of the at least one first groove and a thickness of the bearing film ranges from 1/3 to 1/2; and/or the at least one first groove has a depth equal to a width of an opening of the at least one first groove; and/or the at least one first groove has a cross-sectional shape of one of a triangle, a fillet triangle, and a fillet rectangle.

9 . The display panel according to claim 7 , wherein
a ratio of a depth of the at least one second groove and a thickness of the bearing film ranges from 1/3 to 1/2; and/or the at least one second groove has a depth equal to a width of an opening of the at least one second groove; and/or the at least one second groove has a cross-sectional shape of one of a triangle, a fillet triangle, and a fillet rectangle.

10 . The display panel according to claim 7 , wherein each of the at least one first grooves comprises:
a first central sub-groove, and at least two first side sub-grooves respectively provided on both sides of the first central sub-groove, and the display panel is foldable with a folding line thereof configured to run through the first central sub-groove; each of the at least one second grooves comprises: a second central sub-groove, and at least two second side sub-grooves provided on both sides of the second central sub-groove, and the display panel is foldable with a folding line configured to extend through the second central sub-groove.

11 . The display panel according to claim 7 , wherein:
the bearing film has a thickness of 10 μm to 120 μm, a Poisson's ratio of 0.05 to 0.75, and a Young's modulus of 0.02 GPa to 10 GPa; and/or the support film has a thickness of 10 μm to 105 μm, a Poisson's ratio of 0.1 to 0.5, and a Young's modulus of 1 GPa to 40 GPa.

12 . The display panel according to claim 1 , wherein the substrate layer has a thickness of 8 μm to 18 μm, a Poisson's ratio of 0.1 to 0.6, and a Young's modulus of 0.5 GPa to 20 GPa; and/or
the flexible screen body has a thickness of 10 μm to 19 μm, a Poisson's ratio of 0.1 to 0.5, and a Young's modulus of 30 GPa to 120 GPa; and/or
the touch control layer has a thickness of 80 μm to 120 μm, a Poisson's ratio of 0.1 to 0.7, and a Young's modulus of 0.05 GPa to 80 GPa.

13 . The display panel according to claim 1 , further comprising a polarizer layer and a cover plate, wherein:
the adhesive layer comprises a first adhesive film and a second adhesive film, the first adhesive film is disposed between the flexible screen body and the touch control layer, the polarizer layer is disposed on a side of the touch control layer away from the first adhesive film, the cover plate is disposed on a side of the polarizer layer away from the touch control layer, and the second adhesive film is disposed between the polarizer layer and the cover plate.

14 . The display panel according to claim 13 , wherein:
the first adhesive film has a thickness of 80 μm to 120 μm, a Poisson's ratio of 0.2 to 0.5, and a Young's modulus of 0.0002 GPa to 0.001 GPa; and/or the second adhesive film has a thickness of 80 μm to 120 μm, a Poisson's ratio of 0.1 to 0.7, and a Young's modulus of 0.0002 GPa to 0.001 GPa; and/or the polarizer layer has a thickness of 120 μm to 280 μm, a Poisson's ratio of 0.1 to 0.7, and a Young's modulus of 3 GPa to 14 GPa.

Assignees

• Hefei Visionox Tech Co Ltd

Inventors

• Wang Shanhe
• Sun Tianyu
• Qin Qin
• Xia Kanglun
• Li Wen

Classifications

• H10K77/111

  Flexible substrates · CPC title

• H05K1/118

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

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• H10K2102/311

  Flexible OLED · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title