Backlight module including optical film and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11828968-B2
Application number	US-202017049941-A
Country	US
Kind code	B2
Filing date	Jul 9, 2020
Priority date	Jun 2, 2020
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

A backlight module and a method of manufacturing the backlight module are disclosed. The backlight module includes a substrate including a first end and a second end opposite to the first end. An ink layer is disposed on the substrate and has a reflectivity gradually increasing from the first end to the second end. At least two of light-emitting units are arranged in an array on the ink layer.

First claim

What is claimed is:

1. A backlight module, comprising:
a substrate comprising a first end and a second end opposite to the first end;
an ink layer disposed on the substrate and having a reflectivity gradually increasing from the first end to the second end;
a plurality of light-emitting units, wherein at least two of the light-emitting units are arranged in an array on the ink layer; and
an optical film disposed on the light-emitting units and configured to enable light emitted by the light-emitting units to pass therethrough, wherein the optical film comprises a plurality of dot structures arranged in an array, each of the dot structures are composed of a plurality of protrusions, and a height of the protrusions adjacent to the light-emitting units is less than that of the protrusions away from the light-emitting units.

2. The backlight module of claim 1 , wherein the ink layer is composed of a mixture of white ink and a metal oxide stirred together.

3. The backlight module of claim 2 , wherein a content of the white ink is gradually reduced from the first end to the second end, or a content of the metal oxide gradually increases from the first end to the second end.

4. The backlight module of claim 2 , wherein the metal oxide is at least one of titanium dioxide or aluminum oxide.

5. The backlight module of claim 1 , wherein the ink layer at least comprises a first area and a second area sequentially arranged in a direction from the first end to the second end, wherein the reflectivity in the first area is less than the reflectivity in the second area.

6. The backlight module of claim 5 , wherein a ratio of light transmittance in any adjacent regions in the first area and the second area is between one and two.

7. The backlight module of claim 1 , wherein at least one of the light-emitting units corresponds to a center of the dot structures arranged in the array.

8. The backlight module of claim 1 , wherein the dot structures comprise a convex lens structure.

9. The backlight module of claim 1 , wherein at least two of the protrusions are arranged in an array.

10. A method of manufacturing a backlight module, comprising:
step A: providing a substrate comprising a first end and a second end opposite to the first end;
step B: forming an ink layer on the substrate, wherein the ink layer has a reflectivity gradually increasing from the first end to the second end;
step C: providing a plurality of light-emitting units arranged in an array; and
step D: disposing an optical film on the light-emitting units, wherein the optical film is configured to enable light emitted by the light-emitting units to pass therethrough, the optical film comprises a plurality of dot structures arranged in an array, each of the dot structures are composed of a plurality of protrusions, and a height of the protrusions adjacent to the light-emitting units is less than that of the protrusions away from the light-emitting unit.

11. The method of manufacturing the backlight module of claim 10 , where step B comprises:
step b 11 : forming, by mixing white ink with a metal oxide, an ink material with a predetermined content ratio, wherein the predetermined content ratio at least comprises a first predetermined content ratio and a second predetermined content ratio, wherein the white ink accounts for a content of the ink material with the first predetermined content ratio greater than a content of the ink material with the second predetermined content ratio, or the metal oxide accounts for a content of the ink material with the first predetermined content ratio less than a content of the ink material with the second predetermined content ratio; and
step b 12 : forming, by spraying the ink material with the first predetermined content ratio and the ink material with the second predetermined content ratio on the substrate, the ink layer having a reflectivity gradually increasing, wherein the ink material with the first predetermined content ratio is sprayed on part of the substrate adjacent to the first end, and the ink material with the second predetermined content ratio is sprayed on part of the substrate away from the first end.

12. The method of manufacturing the backlight module of claim 11 , wherein the metal oxide is at least one of titanium dioxide or aluminum oxide.

13. The method of manufacturing the backlight module of claim 10 , wherein the ink layer at least comprises a first area and a second area sequentially arranged in a direction from the first end to the second end, wherein the reflectivity in the first area is less than the reflectivity in the second area.

14. The method of manufacturing the backlight module of claim 10 , wherein a ratio of light transmittance in any adjacent regions in the first area and the second area is between one and two.

15. The method of manufacturing the backlight module of claim 10 , wherein at least one of the light-emitting units corresponds to a center of the dot structures arranged in the array.

16. The method of manufacturing the backlight module of claim 10 , wherein the dot structures comprise a convex lens structure.

17. The method of manufacturing the backlight module of claim 10 , wherein at least two of the protrusions are arranged in an array.

Assignees

• Tcl China Star Optoelectronics Tech Co Ltd

Inventors

• Fu Linlin
• Li Dehua
• Zhang Xin

Classifications

• G02B6/0043 Primary

  provided on the surface of the light guide · CPC title

• C09D17/008

  Titanium dioxide · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title