Flexible backlight, method for manufacturing the same, and display device

Patent metadata

Field	Value
Publication number	US-11119356-B2
Application number	US-201816054761-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Jan 2, 2018
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

The present disclosure provides a flexible backlight, a method for manufacturing the same, and a display device. The flexible backlight includes: a first flexible substrate and a second flexible substrate arranged opposite to each other; a plurality of spacers arranged between the first flexible substrate and the second flexible substrate, for supporting a spacing between the first flexible substrate and the second flexible substrate, and for forming an accommodating chamber between the first flexible substrate and the second flexible substrate; a first electrode and a second electrode for forming an electric field; a gas contained in the accommodating chamber, in which the gas is capable of emitting a non-visible light by the action of the electric field; and a photoexcitation layer arranged on the second flexible substrate, in which the photoexcitation layer can emit a visible light under illumination of the non-visible light and is in contact with the spacer.

First claim

What is claimed is:

1. A flexible backlight, comprising:
a first flexible substrate and a second flexible substrate arranged opposite to each other;
a plurality of spacers arranged between the first flexible substrate and the second flexible substrate, for supporting a spacing between the first flexible substrate and the second flexible substrate, thereby forming an accommodating chamber between the first flexible substrate and the second flexible substrate;
a first electrode and a second electrode for forming an electric field;
a gas contained in the accommodating chamber, wherein the gas is capable of emitting a non-visible light by an action of the electric field;
a photoexcitation layer arranged on the second flexible substrate, wherein the photoexcitation layer is capable of emitting a visible light under illumination of the non-visible light and is in contact with the spacer; and
a light reflecting layer arranged on a side of the first flexible substrate close to the second flexible substrate, wherein the light reflecting layer is only made of a metal, and the light reflecting layer is also used as the first electrode,
wherein the spacer is only made of conductive material, and also used as the second electrode.

2. The flexible backlight according to claim 1 , wherein the non-visible light is an ultraviolet light, and the photoexcitation layer is a fluorescent layer.

3. The flexible backlight according to claim 1 , wherein the flexible backlight further comprises:
a first protective layer arranged on a side of the light reflecting layer close to the second flexible substrate.

4. The flexible backlight according to claim 1 , wherein a cross section of the spacer along a plane perpendicular to the second flexible substrate is in a shape of a trapezoid, a part of an ellipse, an ellipse or a circle.

5. The flexible backlight according to claim 1 , further comprising:
a second protective layer arranged on a side of the second flexible substrate close to the first flexible substrate.

6. The flexible backlight according to claim 5 , wherein the spacer is made of an inorganic material, and the flexible backlight further comprises a transparent conductive layer arranged between the second flexible substrate and the second protective layer and used as the second electrode.

7. The flexible backlight according to claim 1 , wherein a thickness of the accommodating chamber is not more than 1 mm.

8. The flexible backlight according to claim 1 , wherein the gas comprises argon or neon.

9. A display device, comprising a flexible backlight, a flexible circuit board, a printed circuit board, and a backplane, wherein the flexible backlight, comprises:
a first flexible substrate and a second flexible substrate arranged opposite to each other;
a plurality of spacers arranged between the first flexible substrate and the second flexible substrate, for supporting a spacing between the first flexible substrate and the second flexible substrate, thereby forming an accommodating chamber between the first flexible substrate and the second flexible substrate;
a first electrode and a second electrode for forming an electric field;
a gas contained in the accommodating chamber, wherein the gas is capable of emitting a non-visible light by an action of the electric field;
a photoexcitation layer arranged on the second flexible substrate, wherein the photoexcitation layer is capable of emitting a visible light under illumination of the non-visible light and is in contact with the spacer; and
a light reflecting layer arranged on a side of the first flexible substrate close to the second flexible substrate, wherein the light reflecting layer is only made of a metal, and the light reflecting layer is also used as the first electrode,
wherein the spacer is only made of a conductive material, and also used as the second electrode.

10. The display device according to claim 9 , wherein the flexible backlight further comprises a second protective layer arranged on a side of the second flexible substrate close to the first flexible substrate, and a transparent conductive layer arranged between the second flexible substrate and the second protective layer and used as the second electrode, and the spacer is made of an inorganic material.

11. A method for manufacturing a flexible backlight, comprising:
providing a first flexible substrate and a second flexible substrate;
forming a plurality of spacers on the first flexible substrate or the second flexible substrate;
forming a photoexcitation layer on the second flexible substrate, wherein the photoexcitation layer is capable of emitting a visible light under illumination of a non-visible light;
forming a first electrode and a second electrode on the first flexible substrate and/or the second flexible substrate, to form an electric field, wherein the forming the first electrode and the second electrode on the first flexible substrate and/or the second flexible substrate comprises forming, on the first flexible substrate, a light reflecting layer is only made of a metal and used as the first electrode;
encapsulating the first flexible substrate and the second flexible substrate together, to arrange the plurality of spacers between the first flexible substrate and the second flexible substrate and in contact with the photoexcitation layer, thereby forming an accommodating chamber between the first flexible substrate and the second flexible substrate; and
filling a gas into the accommodating chamber, wherein the gas is capable of emitting the non-visible light by an action of the electric field,
wherein the plurality of spacer are only formed of a conductive material and used as the second electrode.

12. The method according to claim 11 , wherein the method further comprises:
forming a first protective layer between the light reflecting layer and the plurality of spacers; and
forming a second protective layer between the second flexible substrate and the photoexcitation layer.

13. The method according to claim 11 , wherein
the spacer is made of an inorganic material, and
the forming the first electrode and the second electrode on the first flexible substrate and/or the second flexible substrate comprises:
forming, on the first flexible substrate, a light reflecting layer used as the first electrode; and
forming, between the second flexible substrate and the photoexcitation layer, a transparent conductive layer used as the second electrode.

14. The method according to claim 13 , wherein the method further comprises:
forming a first protective layer between the light reflecting layer and the plurality of spacers; and
forming a second protective layer between the transparent conductive layer and the photoexcitation layer.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Qin Shuangliang
• Li Dongxiu

Classifications

• G02F1/133604 Primary

  with lamps · CPC title

• G02F1/133614

  using photoluminescence, e.g. phosphors illuminated by UV or blue light · CPC title

• H01J11/16

  with main electrodes provided inside or on the side face of the spacers · CPC title

• G02F1/1343

  Electrodes {(reflective electrodes G02F1/133553)} · CPC title

• G02F1/161

  Gaskets; Spacers; Sealing of cells; Filling or closing of cells · CPC title