# US 10,768,477 B2 · Backlight module

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- Number: US 10,768,477 B2
- Document ID: US10768477B2
- Status: Granted
- Kind: B2
- Application number: 15/853,974
- Filed: 2017-12-26
- Published: 2018-05-03
- Granted: 2020-09-08
- Earliest claimed: 2016-06-27
- Assignees: Unique Materials Co., Ltd.
- Applicants: Unique Materials Co., Ltd.
- Inventors: Huan-Wei Tseng; Chia-Chun Hsieh; Chun-Wei Chou
- Web page: https://patentgrep.com/patent/US10768477B2

## CPC

- G02F 1/133602: {Direct backlight}
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- G02B 6/0031: {Reflecting element, sheet or layer}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/133603: {with LEDs}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- 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
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Provided is a backlight module including a light guide plate, a light source and a light conversion layer. The light source is disposed at one side of the light guide plate. The light conversion layer is disposed over the light guide plate. The light conversion layer includes an optical composite material including 0.1 wt % to 15 wt % of a luminescent material and 85 wt % to 99.9 wt % of an acrylate-based polymer. The acrylate-based polymer is prepared from precursors including 5 wt % to 30 wt % of a surfactant having a thiol group.

## Claims

### Claim 1

A backlight module, comprising:
a light guide plate;
a light source disposed at one side of the light guide plate; and
a light conversion layer disposed over the light guide plate, wherein the light conversion layer comprises an optical composite material, and the optical composite material comprises:
0.1 wt % to 15 wt % of a luminescent material; and
85 wt % to 99.9 wt % of an acrylate-based polymer,
wherein the acrylate-based polymer is prepared from precursors comprising:
5 wt % to 30 wt % of a surfactant having a thiol group;
30 wt % to 50 wt % of a first acrylate monomer;
15 wt % to 30 wt % of a second acrylate monomer;
5 wt % to 20 wt % of a cross-linker; and
1 wt % to 2 wt % of an initiator.

### Claim 2 (depends on 1)

The backlight module of claim 1, wherein the surfactant has at least two thiol groups.

### Claim 3 (depends on 1)

The backlight module of claim 1, wherein the surfactant is a compound represented by formula (I), formula (II) or formula (III) below:
wherein R1, R2, R3, R4, R5 and R6 are the same as or different from one another, and are independently selected from the group consisting of hydrogen, C1 to C20 alkyl, C2 to C20 alkenyl, C2 to C20 alkynyl, C1 to C20 hydroxy alkyl, C1 to C20 alkyl ester, C2 to C20 alkyl ketone, C1 to C20 alkyl thioether and C1 to C20 alkoxy, and at least two of R1 to R6 have a thiol group.

### Claim 4 (depends on 3)

The backlight module of claim 3, wherein at least two of R1 to R6 are C1 to C20 alkyl having a thiol group.

### Claim 5 (depends on 3)

The backlight module of claim 3, wherein at least two of R1 to R6 are C1 to C20 alkyl ester having a thiol group.

### Claim 6 (depends on 3)

The backlight module of claim 3, wherein at least two of R1 to R6 are C1 to C20 alkoxy having a thiol group.

### Claim 7 (depends on 3)

The backlight module of claim 3, wherein at least one thiol group of the surfactant participates in cross-linking.

### Claim 8 (depends on 1)

The backlight module of claim 1, wherein the surfactant has a molecular weight ranging from 100 to 1,000.

### Claim 9 (depends on 1)

The backlight module of claim 1, wherein the optical composite material further comprises particles selected from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, silica, zirconium oxide, antimony trioxide, alumina, Lonsdaleite, diamond-like carbon, bismuth oxychloride, barium titanate, potassium lithium niobate, lithium niobate, lithium tantalate, proustite, polyfluoroolefin, polycarbonate, polystyrene, and an arbitrary a combination thereof.

### Claim 10 (depends on 1)

The backlight module of claim 1, wherein the luminescent material is dispersed and embedded in the acrylate-based polymer, and the luminescent material comprises quantum dots.

### Claim 11 (depends on 1)

The backlight module of claim 1, wherein the light conversion layer comprises the optical composite material in direct contact with and cured between two substrate sheets without gas barrier for protection.

### Claim 12 (depends on 1)

The backlight module of claim 1, wherein the light conversion layer is in direct contact with the light guide plate.

### Claim 13 (depends on 1)

The backlight module of claim 1, wherein the light source is disposed on a side surface of the light guide plate to form an edge-lit structure.

### Claim 14 (depends on 1)

The backlight module of claim 1, wherein the light source is disposed on a bottom surface of the light guide plate to form a direct-lit structure.

### Claim 15 (depends on 1)

The backlight module of claim 1, further comprising:
a reflective layer disposed below the light guide plate to reflect light emitted by the light source into the light conversion layer.