# US 2018/0321433 A1 · Light guide plates and backlight modules thereof

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- Number: US 2018/0321433 A1
- Document ID: US20180321433A1
- Status: Published application
- Kind: A1
- Application number: 15/533,023
- Filed: 2017-05-25
- Published: 2018-11-08
- Earliest claimed: 2017-05-03
- Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Technology Co. Ltd.
- Inventors: Yan CHENG
- Web page: https://patentgrep.com/patent/US20180321433A1

## CPC

- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0011: {the light guides being planar or of plate-like form}
- G02B 6/0028: {Light guide, e.g. taper}
- G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02B 6/0061: {to provide homogeneous light output intensity}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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

The present disclosure relates to a light guide plate and a backlight module thereof, wherein the light guide plate includes: a light incident surface, a transmission layer, and a light emission surface. Wherein a light waveguide layer is configured within the transmission layer to change a transmission direction of at least a portion of light beams entered from the light incident surface along a direction perpendicular to the light emission surface. At least one periodic microstructure is configured on the light emission surface. The present disclosure may improve convergence characteristics of the light beams entered the light guide plate and may reduce the crosstalk between areas.

## Claims

### Claim 1

A backlight module, comprising:
a light guide plate configured with a light incident surface, a transmission layer, and a light emission surface, wherein a light waveguide layer is configured within the transmission layer to change a transmission direction of at least a portion of light beams entered from the light incident surface along a direction perpendicular to the light emission surface;
at least one periodic microstructure configured on the light emission surface;
a light source corresponding to the light incident surface of the light guide plate;
a collimation structure configured on one side of the light guide plate, wherein the collimation structure is configured to collimate light beams emitted from the light emission surface, and the collimation structure is configured with a plurality of collimation-layer units and a plurality of collimation-optical-lens units.

### Claim 2 (depends on 1)

The backlight module according to claim 1, wherein each of the collimation-layer units corresponds to at least one of the periodic microstructures.

### Claim 3 (depends on 1)

The backlight module according to claim 1, wherein each of the collimation-optical-lens units corresponds to one of the collimation layer unit.

### Claim 4 (depends on 1)

The backlight module according to claim 1, wherein the collimation structure comprises:
a first fixing structure is configured with two transparent flat plates, and the collimation-optical-lens units are sandwiched between the transparent flat plates;
a second fixing structure comprises a transparent cavity, and the collimation-optical-lens units are configured within the transparent cavity.

### Claim 5

A light guide plate, comprising:
a light incident surface;
a transmission layer;
a light emission surface;
wherein a light waveguide layer is configured within the transmission layer to change a transmission direction of at least a portion of light beams entered from the light incident surface along a direction perpendicular to the light emission surface;
at least one periodic microstructure is configured on the light emission surface.

### Claim 6 (depends on 5)

The light guide plate according to claim 5, wherein a surface of the light guide plate comprises a plurality of bright areas and a plurality of dark areas, and each of the bright areas and the dark areas corresponds to at least one of the periodic microstructure.

### Claim 7 (depends on 5)

The light guide plate according to claim 5, wherein the light waveguide layer comprises a plurality of transparent media layers, and refractive indexes of the transparent media layers increase gradually along the transmission direction of the light beams.

### Claim 8 (depends on 5)

The light guide plate according to claim 5, wherein the transparent media layers are made of different materials.

### Claim 9 (depends on 5)

The light guide plate according to claim 5, wherein the transparent media layers are made of the same material with different density.

### Claim 10

A backlight module, comprising:
a light source; and
a light guide plate;
wherein the light guide plate is configured with a light incident surface, a transmission layer, and a light emission surface; a light waveguide layer is configured within the transmission layer to change a transmission direction of at least a portion of light beams entered from the light incident surface along a direction perpendicular to the light emission surface; at least one periodic microstructure is configured on the light emission surface; the light source corresponds to the light incident surface of the light guide plate.

### Claim 11 (depends on 10)

The backlight module according to claim 10, wherein the backlight module further comprises a collimation structure configured on one side of the light guide plate, and is configured to collimate the light beams emitted from the light emission surface.

### Claim 12 (depends on 11)

The backlight module according to claim 11, wherein the collimation structure comprises a plurality of collimation-layer units, and each of the collimation-layer units corresponds to at least one of the periodic microstructures.

### Claim 13 (depends on 12)

The backlight module according to claim 12, wherein the collimation structure comprises a plurality of collimation-optical-lens units, and each of the collimation-optical-lens units corresponds to one of the collimation layer unit.

### Claim 14 (depends on 13)

The backlight module according to claim 13, wherein the collimation structure comprises:
a first fixing structure is configured with two transparent flat plates, and the collimation-optical-lens units are sandwiched between the transparent flat plates;
a second fixing structure comprises a transparent cavity, and the collimation-optical-lens units are configured within the transparent cavity.