Flexible display apparatus having a protective film

Patent metadata

Field	Value
Publication number	US-10854841-B2
Application number	US-201916719145-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Dec 27, 2018
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A flexible display apparatus including a protective film is provided. The protective film can include penetrating holes extending in parallel in a direction perpendicular to a bending direction. Deformation preventing elements having the modulus of elasticity higher than the protective film can be disposed in the penetrating holes of the protective film. The protective film and the deformation preventing elements can be coupled with a device substrate including a light-emitting device, an encapsulating layer and a barrier layer, which are sequentially stacked on the device substrate by an adhesive layer. The adhesive layer can include a first adhesive element overlapping with the protective film, and second adhesive elements overlapping with the deformation preventing elements. The second adhesive elements can have the modulus of elasticity lower than the first adhesive element. Thus, in the flexible display apparatus, the deformation of the protective film due to a bending stress can be prevented.

First claim

What is claimed is:

1. A flexible display apparatus comprising:
a light-emitting device on a device substrate;
an encapsulating layer on the device substrate, the encapsulating layer covering the light-emitting device;
a barrier layer on the encapsulating layer;
an adhesive layer on the barrier layer, the adhesive layer including a first adhesive element and second adhesive elements having a modulus of elasticity lower than the first adhesive element;
a protective film on the first adhesive element, the protective film including penetrating holes overlapping with the second adhesive elements; and
deformation preventing elements on the second adhesive elements, the deformation preventing elements having a modulus of elasticity higher than the protective film,
wherein the second adhesive elements and the penetrating holes of the protective film extend in parallel in a direction.

2. The flexible display apparatus according to claim 1 , wherein a coefficient of thermal expansion of the deformation preventing elements is lower than a coefficient of thermal expansion of the protective film.

3. The flexible display apparatus according to claim 1 , wherein the deformation preventing elements include an insulating material.

4. The flexible display apparatus according to claim 3 , wherein the deformation preventing elements include a thermosetting resin.

5. The flexible display apparatus according to claim 1 , wherein a horizontal distance of each second adhesive element is the same as a distance between adjacent second adhesive elements.

6. The flexible display apparatus according to claim 1 , wherein each of the deformation preventing elements has a vertical thickness same as the protective film.

7. The flexible display apparatus according to claim 1 , wherein a horizontal distance of each deformation preventing element is smaller than a distance between adjacent deformation preventing elements.

8. The flexible display apparatus according to claim 7 , wherein the horizontal distance of each deformation preventing element is smaller than a horizontal distance of each second adhesive element.

9. A flexible display apparatus comprising:
a light-emitting device on a device substrate;
an encapsulating layer on the device substrate, the encapsulating layer covering the light-emitting device;
a barrier layer on the encapsulating layer;
a protective film on the barrier layer, the protective film including penetrating holes which extend in parallel;
a first adhesive element between the barrier layer and the protective film, the first adhesive element having a modulus of elasticity higher than the protective film;
deformation preventing elements in the penetrating holes of the protective film, the deformation preventing elements having a modulus of elasticity higher than the protective film; and
second adhesive elements between the barrier layer and the deformation preventing elements, the second adhesive elements having a modulus of elasticity lower than the deformation preventing elements.

10. The flexible display apparatus according to claim 9 , wherein a vertical thickness of each second adhesive element is the same as a vertical thickness of the first adhesive element.

11. The flexible display apparatus according to claim 9 , wherein a side surface of each second adhesive element is vertically aligned with a side surface of each deformation preventing element.

12. The flexible display apparatus according to claim 11 , wherein the second adhesive elements include a material same as the deformation preventing elements, and
wherein a density of each second adhesive element is lower than a density of each deformation preventing element.

13. The flexible display apparatus according to claim 9 , wherein the modulus of elasticity of the second adhesive elements is smaller than the modulus of elasticity of the protective film.

14. The flexible display apparatus according to claim 9 , wherein a modulus of elasticity of the first adhesive element is smaller than the modulus of elasticity of the deformation preventing elements.

Assignees

• Lg Display Co Ltd

Inventors

• Park Joonwon

Classifications

• H10K59/87

  Passivation; Containers; Encapsulations · CPC title

• H10K59/875 Primary

  Arrangements for extracting light from the devices · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/80

  Constructional details · CPC title

• H10K50/8426

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title