# US 11,112,646 B2 · Thin backlight module and manufacturing method thereof

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- Number: US 11,112,646 B2
- Document ID: US11112646B2
- Status: Granted
- Kind: B2
- Application number: 16/336,105
- Filed: 2019-01-03
- Published: 2021-06-17
- Granted: 2021-09-07
- Earliest claimed: 2018-11-28
- Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Inventors: Guowei Zha
- Web page: https://patentgrep.com/patent/US11112646B2

## CPC

- G02F 1/133603: {with LEDs}
- G02F 1/133605: {including specially adapted reflectors}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- 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

## Abstract

A thin backlight module and a manufacturing method of the thin backlight module are provided. The thin backlight module includes a drive substrate, multiple light emitting sources, a fluorescence layer, and multiple particle micro-structures. The light emitting sources are arranged in an array on the drive substrate. The surface micro-structures are arranged on a surface of the fluorescence layer. Each surface micro-structure is arranged corresponding to each light emitting source. Each particle micro-structure is arranged corresponding to each surface micro-structure. Each particle micro-structure and each surface micro-structure together form a guiding layer for dispersing light from a corresponding one of the light emitting sources. Thereby, a smaller light mixing distance and an ultra-thin backlight module thickness are achieved.

## Claims

### Claim 1

A thin backlight module, comprising:
a drive substrate;
a plurality of light emitting sources, the light emitting sources arranged in an array on the drive substrate;
a plurality of reflecting layers disposed on the drive substrate, each of the reflecting layers disposed between each two adjacent ones of the light emitting sources;
a fluorescence layer, a plurality of surface micro-structures disposed on a surface of the fluorescence layer away from the drive substrate, the surface micro-structures disposed in a one-to-one correspondence with the light emitting sources, wherein a center of each surface micro-structure is disposed corresponding to a center of a corresponding one of the light emitting sources, and an inclined surface or a curved surface is defined between the center of each surface micro-structure and the surface of the fluorescence layer;
a diffusing layer disposed on the fluorescence layer;
a top coat layer disposed on the diffusing layer; and
a plurality of particle micro-structures, each of the particle micro-structures disposed corresponding to each of the surface micro-structures, wherein each particle micro-structure and each surface micro-structure together form a guiding layer for dispersing light from a corresponding one of the light emitting sources, the guiding layer is disposed between the fluorescence layer and the diffusing layer, and the light emitting sources are disposed in the fluorescence layer and arranged corresponding to the guiding layer.

### Claim 2 (depends on 1)

The thin backlight module according to claim 1, wherein a size of each of the light emitting sources ranges from 100 μm to 1000 μm and a distance between each two adjacent ones of the light emitting sources ranges from 100 μm to 2000 μm.

### Claim 3 (depends on 1)

The thin backlight module according to claim 1, wherein each particle micro-structure comprises haze particles of a specific concentration, the concentration ranges from 10% to 90%, and a thickness of each particle micro-structures ranges from 1 μm to 100 μm.

### Claim 4 (depends on 1)

The thin backlight module according to claim 1, wherein a length from a center of each surface micro-structure to the surface of the fluorescence layer ranges from 50 μm to 500 μm, and a thickness of each surface micro-structure ranges from 5 μm to 100 μm.

### Claim 5 (depends on 1)

The thin backlight module according to claim 1, wherein each of the light emitting sources is a mini LED or a micro LED; the fluorescence layer comprises a light transmissive adhesive and comprises, mixed with the light transmissive adhesive, one selected from a group consisting of a plurality of fluorescent particles, a plurality of quantum dot particles, or a plurality of haze particles; and the drive substrate is a flexible printed circuit board (FPC) or a printed circuit board (PCB).

### Claim 6

A manufacturing method of a thin backlight module, comprising steps as follows:
providing a drive substrate;
arranging a plurality of light emitting sources on the drive substrate;
producing a plurality of reflecting layers on the drive substrate, wherein each of the reflecting layers is arranged between each two adjacent ones of the light emitting sources;
providing a diffusing layer on the fluorescence layer;
providing a top coat layer on the diffusing layer;
forming a fluorescence layer on the light emitting sources, and hot-pressing a plurality of surface micro-structures on a surface of the fluorescence layer, wherein the surface micro-structures are disposed in a one-to-one correspondence with the light emitting sources, a center of each surface micro-structure is arranged corresponding to a center of a corresponding one of the light emitting sources, and an inclined surface or a curved surface is defined between the center of each surface micro-structure and the surface of the fluorescence layer; and
forming a particle micro-structure on each of the surface micro-structures, wherein each of the particle micro-structures contains particles of a concentration, each particle micro-structure and each surface micro-structure together form a guiding layer for dispersing light from a corresponding one of the light emitting sources, the guiding layer is arranged between the fluorescence layer and the diffusing layer, and the light emitting sources are arranged in the fluorescence layer and arranged corresponding to the guiding layer.

### Claim 7 (depends on 6)

The manufacturing method of the thin backlight module according to claim 6, wherein in step S30, each of the surface micro-structures is produced using a hot-press mold in such a manner that an inclined surface or a curved surface is defined between a center of each surface micro-structure and the surface of the fluorescence layer, wherein a length from the center of each surface micro-structure to the surface of the fluorescence layer ranges from 50 μm to 500 μm, and a thickness of each surface micro-structure ranges from 5 μm to 100 μm.

### Claim 8 (depends on 6)

The manufacturing method of the thin backlight module according to claim 6, wherein a stencil process is utilized to coat or print a light transmissive fluid material on each surface micro-structure, wherein the concentration of the particles of each particle micro-structure ranges from 10% to 90%, and a thickness of each particle micro-structure ranges from 1 μm to 100 μm.