Diffusion element and manufacturing method thereof, backlight module and display device

Patent metadata

Field	Value
Publication number	US-10488707-B2
Application number	US-201715554342-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Jul 27, 2016
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A diffusion element and manufacturing method thereof, a backlight module and a display device are provided. The diffusion element including a non-woven fabric diffusion sheet, wherein the non-woven fabric diffusion sheet includes a substrate of non-woven fabric and a diffusion particle layer attached to at least one surface of the substrate. The diffusion element has the advantages of low cost, high yield and simple processes.

First claim

What is claimed is:

1. A diffusion element, comprising a non-woven fabric diffusion sheet, wherein the non-woven fabric diffusion sheet comprises a substrate of non-woven fabric and a diffusion particle layer attached to at least one surface of the substrate, and
a metal frame, wherein an edge of the non-woven fabric diffusion sheet is fixed on the metal frame, and the non-woven fabric diffusion sheet is in a tension state.

2. The diffusion element according to claim 1 , wherein haze of the non-woven fabric diffusion sheet is in a range of 97%-991%; and light transmittance of the non-woven fabric diffusion sheet is in a range of 45%-48%.

3. The diffusion element according to claim 1 , wherein a material of the non-woven fabric comprises at least one selected from a group consisting of polypropylene (PP) and polyethylene (PE).

4. The diffusion element according to claim 1 , wherein the diffusion particle layer further comprises a resin, and diffusion particles are dispersed in the resin.

5. The diffusion element according to claim 4 , wherein particle size of the diffusion particles is in a range of 5 μm-10 μm.

6. The diffusion element according to claim 4 , wherein a material of the diffusion particles comprises at least one selected from a group consisting of polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET).

7. A backlight module, comprising the diffusion element according to claim 1 .

8. The backlight module according to claim 7 , further comprising a light emitting element and a reflecting element, wherein the light emitting element is disposed between the nonwoven fabric diffusion sheet and the reflecting element; and the backlight module is a direct-lit backlight module.

9. A display device, comprising the backlight module according to claim 7 .

10. The display device according to claim 9 , wherein the display device comprises a TV or a lamp.

11. The diffusion element according to claim 1 , further comprising a frame element, wherein the metal frame is embedded into the frame element.

12. The diffusion element according to claim 1 , further comprising an adhesive, wherein the edge of the non-woven fabric diffusion sheet is bonded onto the metal frame.

13. A backlight module comprising a diffusion element,
the diffusion element comprising a non-woven fabric diffusion sheet, wherein the non-woven fabric diffusion sheet comprises a substrate of non-woven fabric and a diffusion particle layer attached to at least one surface of, the substrate, and
wherein the backlight module further comprises a metal frame, wherein an edge of the non-woven fabric diffusion sheet is fixed on the metal frame, and the non-woven fabric diffusion sheet is in a tension state.

14. A method for manufacturing a diffusion element, comprising
forming a non-woven fabric diffusion sheet, wherein the non-woven fabric diffusion sheet is elastic, wherein forming the non-woven fabric diffusion sheet comprises:
providing a substrate of non-woven fabric, and forming a diffusion particle layer on at least one surface of the substrate;

providing a metal frame, wherein a size of the non-woven fabric is less than a size of the metal frame; and
fixing an edge of non-woven fabric diffusion sheet on the metal frame to allow the non-woven fabric diffusion sheet to be in a tension state.

15. The method for manufacturing the diffusion element according to claim 14 , wherein forming the diffusion particle layer on the at least one surface of the substrate comprises: providing a slurry containing diffusion particles: coating the slurry on the non-woven fabric; and drying the non-woven fabric coated with the slurry to form the diffusion particle layer.

16. The method for manufacturing the diffusion element according to claim 15 , wherein the slurry also comprises a resin, a curing agent and a solvent.

17. The method for manufacturing the diffusion element according to claim 16 , wherein the resin occupies 85%-90% of the gross weight of the slurry; and the diffusion particles occupy 5%-8% of the gross weight of the slurry.

18. The method for manufacturing the diffusion element according to claim 16 , wherein the resin comprises acrylic resin; a material of the diffusion particles comprises at least one selected from the group consisting of PMMA and PET; the curing agent comprises polyurethane curing agent; and the solvent comprises at least one selected from a group consisting of toluene, butanone and alcohol.

19. The method for manufacturing the diffusion element according to claim 15 , wherein particle size of the diffusion particles is in a range of 5 μm-10 μm.

20. The method for manufacturing the diffusion element according to claim 14 , further comprising:
embedding the metal frame into a frame element.

Assignees

• Boe Technology Group Co Ltd
• K Tronics Suzhou Tech Co Ltd

Inventors

• Liu Zhonghua
• Wang Li
• Zheng Zhifu

Classifications

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• B29D11/00326

  having particular surface properties, e.g. a micropattern · CPC title

• B29D11/00798

  Producing diffusers · CPC title

• G02B5/0278

  used in transmission · CPC title

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title