Backlight module, manufacturing method thereof, and display module

Patent metadata

Field	Value
Publication number	US-2025138366-A1
Application number	US-202318693505-A
Country	US
Kind code	A1
Filing date	Feb 24, 2023
Priority date	Feb 24, 2023
Publication date	May 1, 2025
Grant date	—

Abstract

A backlight module, including a back plate, and a colored light source plate, a first color conversion layer and a plurality of first optical processing layers, which are on the back plate and sequentially arranged away from the back plate; where the backlight module further comprises a second color conversion layer on at least a side, away from the back plate, of one of the plurality of first optical processing layers farthest from the back plate; an orthographic projection of the second color conversion layer on the first optical processing layer is in a peripheral edge region of the first optical processing layer; and the second color conversion layer is configured to convert monochromatic light emitted by the colored light source plate and incident into the second color conversion layer, into white light.

First claim

1 . A backlight module, comprising a back plate, a colored light source plate, a first color conversion layer and a plurality of first optical processing layers,
wherein the colored light source plate, the first color conversion layer and the plurality of first optical processing layers are on the back plate and sequentially arranged away from the back plate; the colored light source plate is configured to emit non-white monochromatic light; the first color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the first color conversion layer, into white light; the plurality of first optical processing layers are each configured to scatter light incident into the first optical processing layer; the backlight module further comprises a second color conversion layer on at least a side, away from the back plate, of one of the plurality of first optical processing layers farthest from the back plate; an orthographic projection of the second color conversion layer on the first optical processing layer is in a peripheral edge region of the first optical processing layer; and the second color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the second color conversion layer, into white light.

2 . The backlight module according to claim 1 , wherein the first optical processing layer further comprises a middle display region;
a distribution density of the second color conversion layer is gradually reduced along any direction from the peripheral edge region to the middle display region of the first optical processing layer; the peripheral edge region of the first optical processing layer comprises a non-corner region and at least one corner region; the non-corner region comprises a non-display region and an edge display region; each of the at least one corner region comprises a non-display region and an edge display region; the non-display regions of the non-corner region and the corner region are connected to each other; and the edge display regions of the non-corner region and the corner region are connected to each other; and the non-display regions surround the edge display region; and the edge display regions surround the middle display region.

3 . The backlight module according to claim 2 , wherein the distribution density of the second color conversion layer per area of square millimeter varies linearly from 100% to 3%, in any direction from the peripheral edge region to the middle display region of the first optical processing layer.

4 . The backlight module according to claim 2 , wherein the distribution density of the second color conversion layer per area of square millimeter varies, in a direction from any one of the at least one corner region to the middle display region of the first optical processing layer, as follows: 100%→any distribution density in a range of 20% to 30%→any distribution density in a range of 10% to 15%→any distribution density in a range of 6% to 8%→any distribution density in a range of 1% to 3%.

5 . The backlight module according to claim 4 , wherein ranges of widths, in the direction from any one of the at least one corner region to the middle display region of the first optical processing layer, of respective regions with different distribution densities in the second color conversion layer are as follows:
a width of a region with the distribution density of 100% is in a range of 0.8 mm to 1.0 mm; a width of a region with any distribution density in the range of 20% to 30% is in a range of 4.5 mm to 5.5 mm; a width of a region with any distribution density in the range of 10% to 15% is in a range of 5.0 mm to 6.0 mm; a width of a region with any distribution density in the range of 6% to 8% is in a range of 4.0 mm to 5.0 mm; and a width of a region with any distribution density in the range of 1% to 3% is in a range of 4.0 mm to 5.0 mm.

6 . The backlight module according to claim 4 , wherein the distribution density of the second color conversion layer per area of square millimeter varies, in a direction from the non-corner region to the middle display region of the first optical processing layer, as follows: 100%→any distribution density in a range of 10% to 15%→any distribution density in a range of 6% to 8%→any distribution density in a range of 1% to 3%.

7 . The backlight module according to claim 6 , wherein ranges of widths, in the direction from the non-corner region to the middle display region of the first optical processing layer, of respective regions with different distribution densities in the second color conversion layer are as follows:
a width of a region with the distribution density of 100% is in a range of 0.8 mm to 1.0 mm; a width of a region with any distribution density in the range of 10% to 15% is in a range of 5.0 mm to 6.0 mm; a width of a region with any distribution density in the range of 6% to 8% is in a range of 4.0 mm to 5.0 mm; and a width of a region with any distribution density in the range of 1% to 3% is in a range of 4.0 mm to 5.0 mm.

8 . The backlight module according to claim 4 , wherein the corner region of the first optical processing layer is a corner region with a right angle; and
a shape of a region, within the corner region of the first optical processing layer, with any distribution density per area of square millimeter in the range of 20% to 30% in the second color conversion layer, is an isosceles right triangle.

9 . The backlight module according to claim 1 , wherein at least two of the plurality of first optical processing layers farther from the back plate are each provided with one second color conversion layer on a side of the first optical processing layer away from the back plate, and the at least two first optical processing layers and the second color conversion layers are sequentially and alternately stacked.

10 . The backlight module according to claim 3 , wherein an orthographic projection of a region of the second color conversion layer with the distribution density per area of square millimeter of 100% on the first optical processing layer, covers the non-display region.

11 . The backlight module according to claim 2 , wherein the second color conversion layer comprises a first part and a second part,
an orthographic projection of the first part on the first optical processing layer covers the non-display region; an orthographic projection of the second part on the first optical processing layer is in the edge display region; and the second part comprises a plurality of sub-patterns arranged at intervals.

12 . The backlight module according to claim 11 , wherein a spacing between any two adjacent sub-patterns of the plurality of sub-patterns varies linearly from 0.25 mm to 0.7 mm, in any direction from the edge display region of the peripheral edge region to the middle display region of the first optical processing layer.

13 . The backlight module according to claim 11 , wherein a spacing between any two adjacent sub-patterns of the plurality of sub-patterns varies, in a direction from the edge display region within any one of the at least one corner region of the first optical processing layer to the middle display region, as follows: any spacing in a range of 0.20 mm to 0.28 mm→any spacing in a range of 0.30 mm to 0.38 mm→any spacing in a range of 0.5 mm to 0.7 mm→any spacing in a range of 0.8 mm to 0.9 mm.

14 . The backlight module according to claim 11 , wherein a spacing between any two adjacent sub-patterns of the plurality of sub-patterns varies, in a directi

Assignees

• Chongqing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhang Jinhong
• Wang Yu
• Luo Wencheng
• Yuan Qiong
• Zhou Ying
• Li Zhi
• Ran Wei
• Zhang Hening
• Xiong Bowen
• Quan Wenqi
• Cen Xin
• Liao Ke

Classifications

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02F1/133622

  Colour sequential illumination · CPC title

• G02F1/133604 Primary

  with lamps · CPC title

• G02F1/133614 Primary

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