# US 10,769,983 B2 · Backlight module and method for manufacturing the same, and display device

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- Number: US 10,769,983 B2
- Document ID: US10769983B2
- Status: Granted
- Kind: B2
- Application number: 16/258,651
- Filed: 2019-01-27
- Published: 2019-05-23
- Granted: 2020-09-08
- Earliest claimed: 2018-10-31
- Assignees: Xiamen Tianma Micro-Electronics Co., Ltd.
- Applicants: Xiamen Tianma Micro-Electronics Co., Ltd.
- Inventors: Hailiang Wang; Binyi Zheng; Yan Yang; Ling Wu; Boping Shen
- Web page: https://patentgrep.com/patent/US10769983B2

## CPC

- G02F 1/133603: {with LEDs}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02F 1/133611: {including means for improving the brightness uniformity}
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H05B 45/10: Controlling the intensity of the light
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

The present disclosure relates to a backlight module, a method for manufacturing the backlight module, and a display device. The backlight module includes a substrate, a plurality of LED chips, and a first film having a plurality of channels. Each channel is filled with a channel filling portion. A refractive index n1 of the first film is smaller than a refractive index of the channel filling portion is n2. The first film has a first region and second region. Channels in the first region are astigmatism holes for diverging the light having a high intensity and channels in the second region are light-converging holes for converging the light having a low intensity, thereby alleviating or eliminating the starry phenomenon.

## Claims

### Claim 1

A backlight module, comprising:
a substrate;
a plurality of LED chips arranged on a side of the substrate and electrically connected to the substrate; and
a first film disposed on a side of each of the plurality of LED chips facing away from the substrate, wherein each of the first films are formed in one piece,
wherein an orthographic projection of the at least one LED chip on a plane of the substrate is located within an orthographic projection of the first film on the plane of the substrate,
the first film has a plurality of channels penetrating through the first film,
each of the plurality of channels comprises a first side close to the at least one LED chip and a second side facing away from the at least one LED chip,
each of the plurality of channels is filled with a channel filling portion having a first end surface located on the first side and a second end surface located on the second side, the first film has a refractive index nl, and the channel filling portion has a refractive index n2, where n2>n1, wherein total reflection occurs when light emitted from the LED chips is transmitted in the channels, and
the first film has a first region and a second region surrounding the first region, an orthographic projection of the first region on the plane of the substrate at least partially overlaps with an orthographic projection of the at least one LED chip of on the plane of the substrate; in the first region, an area of the first end surface of the channel filling portion is smaller than an area of the second end surface of the channel filling portion in a same channel; and in the second region, an area of the first end surface of the channel filling portion is larger than an area of the second end surface of the channel filling portion in a same channel.

### Claim 2 (depends on 1)

The backlight module according to claim 1, wherein the first end surface and the second end surface of the channel filling portion in a same channel have a same shape.

### Claim 3 (depends on 2)

The backlight module according to claim 2, wherein the first end surface and the second end surface of the channel filling portion in a same channel both have a shape of circle or polygon.

### Claim 4 (depends on 3)

The backlight module according to claim 3, wherein a center of the orthographic projection of the first region of the first film on the plane of the substrate coincides with a center of the orthographic projection of the at least one LED chip on the plane of the substrate.

### Claim 5 (depends on 1)

The backlight module according to claim 1, wherein a material of the first film is polymethyl methacrylate, and the channel filling portion is poly(2-methylallyl benzothiazolethiol ester).

### Claim 6 (depends on 1)

The backlight module according to claim 1, wherein the plurality of LED chips is arranged on the substrate in a matrix.

### Claim 7 (depends on 1)

The backlight module according to claim 1, further comprising a fluorescent film located on a side of the first film facing away from the plurality of LED chips.

### Claim 8 (depends on 1)

The backlight module according to claim 1, further comprising a fluorescent film located on a side of the first film close to the plurality of LED chips.

### Claim 9

A method for manufacturing a backlight module comprising:
a substrate;
a plurality of LED chips arranged on a side of the substrate and electrically connected to the substrate; and
a first film disposed on a side of each of the plurality of LED chips facing away from the substrate, wherein each of the first films are formed in one piece,
wherein an orthographic projection of the at least one LED chip on a plane of the substrate is located within an orthographic projection of the first film on the plane of the substrate,
the first film has a plurality of channels penetrating through the first film,
each of the plurality of channels comprises a first side close to the at least one LED chip and a second side facing away from the at least one LED chip,
each of the plurality of channels is filled with a channel filling portion having a first end surface located on the first side and a second end surface located on the second side,
the first film has a refractive index nl, and the channel filling portion has a refractive index n2, where n2>n1, wherein total reflection occurs when light emitted from the LED chips is transmitted in the channels, and
the first film has a first region and a second region surrounding the first region, an orthographic projection of the first region on the plane of the substrate at least partially overlaps with an orthographic projection of the at least one LED chip of on the plane of the substrate; in the first region, an area of the first end surface of the channel filling portion is smaller than an area of the second end surface of the channel filling portion in a same channel; and in the second region, an area of the first end surface of the channel filling portion is larger than an area of the second end surface of the channel filling portion in a same channel,
wherein the method comprises:
preparing the substrate and a finished film layer, wherein the plurality of LED chips is electrically connected to a surface of the substrate; and
arranging the finished film layer on a side of the plurality of LED chips facing away from the substrate in such manner that the finished film layer covers at least one LED chip of the plurality of LED chips,
wherein the finished film layer comprises a first film and a channel filling portion.

### Claim 10 (depends on 9)

The method for manufacturing the backlight module according to claim 9, wherein a process of preparing the first film in the process of preparing the substrate and the finished film layer comprises:
preparing a first film having a plurality of channels extending therethrough; and
filling each of the plurality of channels with the channel filling portion to form the finished film layer.

### Claim 11 (depends on 10)

The method for manufacturing the backlight module according to claim 10, wherein the process of preparing the first film comprises:
providing a layer-shaped initial film layer, and
forming a plurality of channels penetrating through the layer-shaped film by wet etching, so as to form the first film.

### Claim 12 (depends on 10)

The method for manufacturing the backlight module according to claim 10, wherein the process off preparing the first film comprises:
providing a mold having a plurality of protrusions, wherein the plurality of protrusions has a same shape as the plurality of channels, and a protrusion height of the plurality of protrusions with respect to the mold is greater than or equal to a distance between the first end surface and the second end face,
coating a material of the first film on regions of the mold other than the plurality of protrusions,
solidifying the material of the first film so as to form the first film, and
removing the mold from the first film.

### Claim 13 (depends on 10)

The method for manufacturing the backlight module according to claim 10, wherein the process of filling each of the plurality of channels with the channel filing portion to form the first film comprises:
filling the plurality of channels with a material of the channel filing portion by coating.

### Claim 14

A display device, comprising:
a display panel; and
a backlight module configured to provide backlight to the display panel, wherein the backlight module comprises:
a substrate;
a plurality of LED chips arranged on a side of the substrate and electrically connected to the substrate; and
a first film disposed on a side of each of the plurality of LED chips facing away from the substrate, wherein each of the first films are formed in one piece,
wherein an orthographic projection of the at least one LED chip on a plane of the substrate is located within an orthographic projection of the first film on the plane of the substrate,
the first film has a plurality of channels penetrating through the first film,
each of the plurality of channels comprises a first side close to the at least one LED chip and a second side facing away from the at least one LED chip,
each of the plurality of channels is filled with a channel filling portion having a first end surface located on the first side and a second end surface located on the second side,
the first film has a refractive index nl, and the channel filling portion has a refractive index n2, where n2>n1, wherein total reflection occurs when light emitted from the LED chips is transmitted in the channels, and
the first film has a first region and a second region surrounding the first region, an orthographic projection of the first region on the plane of the substrate at least partially overlaps with an orthographic projection of the at least one LED chip of on the plane of the substrate; in the first region, an area of the first end surface of the channel filling portion is smaller than an area of the second end surface of the channel filling portion in a same channel; and in the second region, an area of the first end surface of the channel filling portion is larger than an area of the second end surface of the channel filling portion in a same channel.