# US 11,307,459 B2 · Display device comprising a switchable diffuser and a backlight module having a first region and a second region, and a mobile device comprising the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,307,459 B2
- Document ID: US11307459B2
- Status: Granted
- Kind: B2
- Application number: 17/180,667
- Filed: 2021-02-19
- Published: 2021-11-11
- Granted: 2022-04-19
- Earliest claimed: 2020-05-07
- Assignees: Innolux Corporation
- Applicants: Innolux Corporation
- Inventors: Minghuang Chen; Chuan-Chi Chien; Yun-Hsin Chang; I-An Yao
- Web page: https://patentgrep.com/patent/US11307459B2

## CPC

- G02F 1/133605: {including specially adapted reflectors}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0041: {provided in the bulk of the light guide}
- G02B 6/0043: {provided on the surface of the light guide}
- G02B 6/0051: {Diffusing sheet or layer}
- G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0061: {to provide homogeneous light output intensity}
- G02F 1/1334: based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F 1/13756: {the liquid crystal selectively assuming a light-scattering state (G02F1/1334, G02F1/13718 take precedence)}
- G02F 1/157: Structural association of cells with optical devices, e.g. reflectors or illuminating devices
- G02F 1/1677: Structural association of cells with optical devices, e.g. reflectors or illuminating devices
- G02F 1/15: based on an electrochromic effect
- G02F 1/167: by electrophoresis
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A display device and a mobile device are provided. The display device includes a display panel, a backlight module, and a switchable diffuser. The backlight module has a first region and a second region. The backlight module includes a reflector and optical layers. The reflector includes a non-reflecting portion in the first region and a reflecting portion in the second region. The optical layers are disposed on the reflector. The switchable diffuser is disposed between the display panel and the backlight module. At least one of the optical layers includes different structures in the first region and the second region.

## Claims

### Claim 1

A display device, comprising:
a display panel;
a backlight module having a first region and a second region, the backlight module comprising:
a reflector having a non-reflecting portion in the first region and a reflecting portion in the second region;
a plurality of optical layers disposed on the reflector; and
a light-shielding element disposed in the second region and close to a periphery of the first region; and
a switchable diffuser disposed between the display panel and the backlight module,
wherein at least one of the plurality of optical layers comprises different structures in the first region and the second region.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the at least one of the plurality of optical layers comprises a non-pattern structure in the first region.

### Claim 3 (depends on 2)

The display device according to claim 2, wherein the at least one of the plurality of optical layers is one of a light guide plate, a prism sheet, and a diffuser.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein another one of the plurality of optical layers comprises an opening in the first region.

### Claim 5 (depends on 4)

The display device according to claim 4, wherein the another one of the plurality of optical layers is a diffuser.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein the backlight module is an edge-lit backlight module.

### Claim 7 (depends on 1)

The display device according to claim 1, wherein the non-reflecting portion is an opening penetrating the reflector.

### Claim 8 (depends on 1)

The display device according to claim 1, further comprising:
another switchable diffuser, wherein the backlight module is disposed between the another switchable diffuser and the switchable diffuser.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein the another switchable diffuser and the switchable diffuser switch to a scattering state together or switch to a transparent state together.

### Claim 10

A mobile device, comprising:
a display device, comprising:
a display panel;
a backlight module having a first region and a second region, the backlight module comprising:
a reflector having a non-reflecting portion in the first region and a reflecting portion in the second region; and
a plurality of optical layers disposed on the reflector; and
a switchable diffuser disposed between the display panel and the backlight module,
wherein at least one of the plurality of optical layers comprises different structures in the first region and the second region; and
an optical sensor disposed corresponding to the first region.

### Claim 11 (depends on 10)

The mobile device according to claim 10, further comprising:
a light-emitting element adjacent to the optical sensor.

### Claim 12 (depends on 10)

The mobile device according to claim 10, wherein the at least one of the plurality of the optical layers comprises a non-pattern structure in the first region.

### Claim 13 (depends on 12)

The mobile device according to claim 12, wherein the at least one of the plurality of the optical layers is one of a light guide plate, a prism sheet, and a diffuser.

### Claim 14 (depends on 10)

The mobile device according to claim 10, wherein another one of the plurality of optical layers comprises an opening in the first region.

### Claim 15 (depends on 14)

The mobile device according to claim 14, wherein the another one of the plurality of optical layers is a diffuser.

### Claim 16 (depends on 10)

The mobile device according to claim 10, wherein the backlight module further comprises:
a light-shielding element disposed in the second region and close to a periphery of the first region.

### Claim 17 (depends on 10)

The mobile device according to claim 10, wherein the non-reflecting portion is an opening penetrating the reflector.

### Claim 18 (depends on 10)

The mobile device according to claim 10, wherein the backlight module is an edge-lit backlight module.

### Claim 19 (depends on 10)

The mobile device according to claim 10, wherein the display device further comprises:
another switchable diffuser, wherein the backlight module is disposed between the another switchable diffuser and the switchable diffuser.