Display module and display apparatus

Patent metadata

Field	Value
Publication number	US-12225753-B2
Application number	US-202117915529-A
Country	US
Kind code	B2
Filing date	Oct 21, 2021
Priority date	Nov 6, 2020
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A display module includes a flexible display panel including a display portion, a binding portion, and a bending portion; a first back film, a second back film fitted to the display portion and the binding portion, respectively, an auxiliary support layer located between the first and second back films, bonded with the back films through first and second adhesive layers, respectively, and provided with an elastic modulus greater than the first and second back films; orthographic projections of the back films are located in or overlaps with those of the display portion and the bind portion, respectively. Side edges of the first and second back films and the auxiliary support layer close to the bending portion are first, second and third side edges, respectively; a spacing between the third and first side edges and a spacing between the third and second side edges are 0-0.35 mm.

First claim

What is claimed is:

1. A display module comprising:
a flexible display panel comprising a display portion, a binding portion at a back side of the display portion, and a bending portion connecting the display portion and the binding portion;
a first back film located between the display portion and the binding portion and fitted to the back side of the display portion, wherein an orthographic projection of the first back film on a reference plane is located in or overlaps with an orthographic projection of the display portion on the reference plane; a side edge of the first back film close to the bending portion is a first side edge;
a second back film fitted to a side of the binding portion facing the display portion, wherein an orthographic projection of the second back film on the reference plane is located in or overlaps with an orthographic projection of the binding portion on the reference plane; a side edge of the second back film close to the bending portion is a second side edge;
an auxiliary support layer located between the first back film and the second back film, wherein the auxiliary support layer is bonded with the first back film through a first adhesive layer, and is bonded with the second back film through a second adhesive layer; a side edge of the auxiliary support layer close to the bending portion is a third side edge; wherein a spacing between the third side edge and the first side edge ranges from 0 to 0.35 mm, a spacing between the third side edge and the second side edge ranges from 0 to 0.35 mm; and
an elastic modulus of the auxiliary support layer is greater than an elastic modulus of the first back film and an elastic modulus of the second back film, and the reference plane is a plane perpendicular to a thickness direction of the display module.

2. The display module according to claim 1 , wherein,
a boundary line between the bending portion and the display portion is a first boundary line, and a boundary line between the bending portion and the binding portion is a second boundary line; wherein:
the first side edge is located on a side of the first boundary line away from the bending portion and a spacing between the first side edge and the first boundary line is less than or equal to 0.1 mm; and
the second side edge is located on a side of the second boundary line away from the bending portion and a spacing between the second side edge and the second boundary line is less than or equal to 0.1 mm.

3. The display module according to claim 1 , wherein,
the third side edge is flush with at least one of the first side edge and the second side edge.

4. The display module according to claim 2 , wherein the first side edge, the second side edge and the third side edge are flush with each other.

5. The display module according to claim 1 , wherein the third side edge is located on sides of the first side edge and the second side edge away from the bending portion.

6. The display module according to claim 1 , wherein the elastic modulus of the auxiliary support layer ranges from 150 GPa to 200 GPa, and the elastic modulus of the first back film and the elastic modulus of the second back film range from 3 GPa to 9 GPa.

7. The display module according to claim 6 , wherein a material of the auxiliary support layer is stainless steel, and a material of the first back film and a material of the second back film are polyethylene terephthalate or polyimide.

8. The display module according to claim 1 , wherein a thickness of the auxiliary support layer ranges from 30 μm to 150 μm.

9. The display module according to claim 1 , wherein the orthographic projection of the binding portion on the reference plane overlaps with a partial region of the orthographic projection of the display portion on the reference plane.

10. The display module according to claim 9 , wherein,
an orthographic projection of the first adhesive layer on the reference plane overlaps with the orthographic projection of the first back film on the reference plane; or
an outer contour of an orthographic projection of the first adhesive layer on the reference plane is located on an inner side of an outer contour of the orthographic projection of the first back film on the reference plane, and a spacing between the outer contour of the orthographic projection of the first adhesive layer on the reference plane and the outer contour of the orthographic projection of the first back film on the reference plane is less than or equal to 0.2 mm.

11. The display module according to claim 9 , wherein,
an orthographic projection of the second adhesive layer on the reference plane overlaps with the orthographic projection of the second back film on the reference plane; or
an outer contour of an orthographic projection of the second adhesive layer on the reference plane is located on an inner side of an outer contour of the orthographic projection of the second back film on the reference plane, and a spacing between the outer contour of the orthographic projection of the second adhesive layer on the reference plane and the outer contour of the orthographic projection of the second back film on the reference plane is less than or equal to 0.2 mm.

12. The display module according to claim 10 , wherein an elastic modulus of the first adhesive layer is less than an elastic modulus of the second adhesive layer.

13. The display module according to claim 12 , wherein the first adhesive layer is an optical adhesive layer or a foam adhesive, and the second adhesive layer is a pressure sensitive adhesive.

14. The display module according to claim 13 , wherein,
the first adhesive layer is the optical adhesive layer, and a thickness of the optical adhesive layer ranges from 20 μm to 50 μm; or
the first adhesive layer is the foam adhesive, and a thickness of the foam adhesive is greater than or equal to 130 μm.

15. The display module according to claim 1 , further comprising:
a strain neutral adhesive layer, wherein the strain neutral adhesive layer covers an outer side of the bending portion as well as edge parts of the display portion and the binding portion.

16. A display apparatus, comprising a flexible circuit board and a display module, the display module comprises:
a flexible display panel comprising a display portion, a binding portion at a back side of the display portion, and a bending portion connecting the display portion and the binding portion;
a first back film located between the display portion and the binding portion and fitted to the back side of the display portion, wherein an orthographic projection of the first back film on a reference plane is located in or overlaps with an orthographic projection of the display portion on the reference plane; a side edge of the first back film close to the bending portion is a first side edge;
a second back film fitted to a side of the binding portion facing the display portion, wherein an orthographic projection of the second back film on the reference plane is located in or overlaps with an orthographic projection of the binding portion on the reference plane; a side edge of the second back film close to the bending portion is a second side edge;
an auxiliary support layer located between the first back film and the second back film, wherein the auxiliary support layer is bonded with the first back film through a first adhesive layer, and is bonded with the second back film through a second adhesive layer; a side edge of the auxiliary support layer close to the bending portion is a third side edge; wherein a spacing between the third side edge and the first side edge rang

Assignees

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

Inventors

• Bi Xin
• Gong Wei
• Wang Yanli
• Wang Jiaxiang
• Cai Yangyang
• Lin Xinqi

Classifications

• G06F1/1652

  the display being flexible, e.g. mimicking a sheet of paper, or rollable · CPC title

• H05K5/02

  Details · CPC title

• H10K2102/311

  Flexible OLED · CPC title

• G06F1/1637

  Details related to the display arrangement, including those related to the mounting of the display in the housing · CPC title

• G09F9/30

  in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00) · CPC title