# US 12,004,280 B2 · Display device

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- Number: US 12,004,280 B2
- Document ID: US12004280B2
- Status: Granted
- Kind: B2
- Application number: 17/855,950
- Filed: 2022-07-01
- Published: 2023-01-19
- Granted: 2024-06-04
- Earliest claimed: 2021-07-15
- Assignees: Shanghai Tianma Micro-Electronics Co., Ltd.
- Applicants: Shanghai Tianma Micro-Electronics Co., Ltd.
- Inventors: Hitoshi Yoshida
- Web page: https://patentgrep.com/patent/US12004280B2

## CPC

- H05B 47/11: by determining the brightness or colour temperature of ambient light
- G02B 6/0043: {provided on the surface of the light guide}
- G02B 6/0058: {varying in density, size, shape or depth along the light guide}
- G02F 1/133374: {for displaying permanent signs or marks}
- G02F 1/133388: {with constructional differences between the display region and the peripheral region}
- G02F 1/133626: {providing two modes of illumination, e.g. day-night}
- G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines}
- G02B 6/0021: {for housing at least a part of the light source, e.g. by forming holes or recesses}
- G02B 6/009: {of the light source in the package (G02B6/0021 takes precedence)}
- G09G 3/36: using liquid crystals
- G09G 2360/144: the light being ambient light
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- 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
- 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)

## Abstract

A display device includes a first liquid crystal display, a decorative member, an illuminator, and a controller. The decorative member is disposed on a display surface side of the first liquid crystal display, and includes a first display region in which a display of the first liquid crystal display is transparently displayed and a first non-display region adjacent to the first display region. The illuminator illuminates the first non-display region from the back surface. The controller controls, in accordance with a luminance of a first black display region, of the first display region, that corresponds to a black display portion the first liquid crystal display, an amount of illumination light emitted from the illuminator toward the first non-display region.

## Claims

### Claim 1

A display device comprising:
a first liquid crystal display;
a decorative member that is disposed on a display surface side of the first liquid crystal display, and includes:
a first display region in which a display of the first liquid crystal display is transparently displayed,
a first non-display region adjacent to the first display region, and
a decoration layer formed across the first display region and the first non-display region;
an illuminator that illuminates the first non-display region from a back surface; and
a controller that controls, in accordance with a luminance of a first black display region, of the first display region, that corresponds to a black display portion of the first liquid crystal display, an amount of illumination light emitted from the illuminator toward the first non-display region to an amount that causes a luminance of the first non-display region to match the luminance of the first black display region.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the illuminator includes a light source, and a light guide that guides light source light emitted from the light source and emits the guided light source light as the illumination light toward the first non-display region.

### Claim 3 (depends on 2)

The display device according to claim 2, wherein the light guide reduces an emission amount of the illumination light emitted toward the first non-display region as a distance from a boundary between the first display region and the first non-display region increases.

### Claim 4 (depends on 1)

The display device according to claim 1, further comprising:
a detector that detects external light, wherein
the controller controls the amount of illumination light in accordance with at least one of a brightness and a color temperature of the external light detected by the detector.

### Claim 5 (depends on 1)

The display device according to claim 1, further comprising:
a second liquid crystal display disposed juxtaposed to the first liquid crystal display, wherein
the decorative member includes a second display region in which a display of the second liquid crystal display is transparently displayed, and a second non-display region adjacent to the first non-display region and the second display region,
the illuminator illuminates the first non-display region and the second non-display region from a back surface, and includes a light source and a light guide that guides light source light emitted from the light source and emits the guided light source light as the illumination light toward the first non-display region and the second non-display region,
in the first non-display region and the second non-display region positioned between the first display region and the second display region, the light guide reduces an emission amount of the illumination light emitted toward the first non-display region as a distance from a boundary between the first display region and the first non-display region increases, and reduces an emission amount of the illumination light emitted toward the second non-display region as a distance from a boundary between the second display region and the second non-display region increases, and
the controller controls the amount of illumination light emitted from the illuminator toward the first non-display region in accordance with the luminance of the first black display region and controls an amount of illumination light emitted from the illuminator toward the second non-display region in accordance with a luminance of a second black display region, of the second display region, that corresponds to a black display portion of the second liquid crystal display, thereby causing the luminance of the first non-display region and a luminance of the second non-display region to match at a boundary between the first non-display region and the second non-display region positioned between the first display region and the second display region.

### Claim 6 (depends on 5)

The display device according to claim 5, further comprising:
a detector that detects external light, wherein
the controller controls the amount of illumination light emitted from the illuminator toward the first non-display region and the amount of illumination light emitted from the illuminator toward the second non-display region in accordance with at least one of a brightness and a color temperature of the external light detected by the detector.

### Claim 7 (depends on 1)

The display device according to claim 1, further comprising:
a second liquid crystal display disposed juxtaposed to the first liquid crystal display, wherein
the decorative member includes a second display region in which a display of the second liquid crystal display is transparently displayed, and a second non-display region adjacent to the first non-display region and the second display region,
a luminance of a second black display region, of the second display region, that corresponds to a black display portion of the second liquid crystal display is less than the luminance of the first black display region,
the illuminator illuminates the first non-display region and the second non-display region from the back surface, and includes a light source and a light guide that guides light source light emitted from the light source and emits the guided light source light as the illumination light toward the first non-display region and the second non-display region,
in the first non-display region and the second non-display region positioned between the first display region and the second display region, the light guide reduces emission amounts of the illumination light emitted toward the first non-display region and the second non-display region as a distance from a boundary between the first display region and the first non-display region increases, and
the controller controls the amount of illumination light emitted from the illuminator toward the first non-display region in accordance with the luminance of the first black display region and controls an amount of illumination light emitted from the illuminator toward the second non-display region in accordance with the luminance of the second black display region, thereby causing a luminance of the second non-display region and the luminance of the second black display region to match at a boundary between the second display region and the second non-display region positioned between the first display region and the second display region.

### Claim 8 (depends on 7)

The display device according to claim 7, further comprising:
a detector that detects external light, wherein
the controller controls the amount of illumination light emitted from the illuminator toward the first non-display region and the amount of illumination light emitted from the illuminator toward the second non-display region in accordance with at least one of a brightness and a color temperature of the external light detected by the detector.