# US 12,112,712 B2 · Backlight driving board, backlight module, display apparatus and method for adjusting brightness and color temperature thereof

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- Number: US 12,112,712 B2
- Document ID: US12112712B2
- Status: Granted
- Kind: B2
- Application number: 17/638,780
- Filed: 2021-04-08
- Published: 2022-09-01
- Granted: 2024-10-08
- Earliest claimed: 2020-05-08
- Assignees: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Lijin Zhao; Yu Zhang; Shixin Geng; Guangyun Tong; Zhuolong Li; Miao Liu; Huiyan Li; Fan Yang
- Web page: https://patentgrep.com/patent/US12112712B2

## CPC

- G09G 3/3413: {Details of control of colour illumination sources}
- G09G 3/2092: {Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165)}
- G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix}
- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- H05K 1/141: {One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters (H05K1/142 and H05K1/147 take precedence)}
- G09G 5/02: characterised by the way in which colour is displayed {(details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607)}
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/064: by time modulation of the brightness of the illumination source
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- G09G 2340/06: Colour space transformation
- G09G 2360/145: the light originating from the display screen
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- G09G 2370/14: Use of low voltage differential signaling [LVDS] for display data communication
- H05K 1/181: associated with surface mounted components
- H05K 2201/049: PCB for one component, e.g. for mounting onto mother PCB
- H05K 2201/10121: Optical component, e.g. opto-electronic component
- H05K 2201/10136: Liquid Crystal display [LCD]
- H05K 2201/10151: Sensor
- 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)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A backlight driving board includes a main circuit board, and a photosensitive device, a backlight controller and a first port that are disposed on the main circuit board. The photosensitive device is configured to sense brightness and color temperature of a light source, and output brightness data and color temperature data. The backlight controller is coupled to the photosensitive device, and configured to receive the brightness data and adjust light-emitting brightness of the light source according to the brightness data. The first port is coupled to the photosensitive device, and configured to be coupled to a system board, receive the color temperature data, and transmit the color temperature data to the system board, such that the system board adjusts color temperature of a picture displayed by a display panel according to the color temperature data.

## Claims

### Claim 1

A backlight driving board, comprising:
a main circuit board;
a photosensitive device disposed on the main circuit board, the photosensitive device being configured to sense a brightness and a color temperature of a light source, and output brightness data and color temperature data;
a backlight controller disposed on the main circuit board, the backlight controller being coupled to the photosensitive device, and configured to receive the brightness data and adjust a light-emitting brightness of the light source according to the brightness data;
a first port disposed on the main circuit board, the first port being coupled to the photosensitive device, and configured to be coupled to a system board, receive the color temperature data, and transmit the color temperature data to the system board, such that the system board adjusts a color temperature of a picture displayed by a display panel according to the color temperature data; and
an auxiliary circuit board, the auxiliary circuit board and the main circuit board being capable of transmitting data to each other, and the photosensitive device being disposed on the main circuit board through the auxiliary circuit board.

### Claim 2 (depends on 1)

The backlight driving board according to claim 1, wherein:
the main circuit board includes a first main surface and a second main surface opposite to each other; the first main surface is configured to be proximate to the light source;
the auxiliary circuit board includes a fixed portion and an extending portion; the fixed portion is fixed to the second main surface of the main circuit board, and the extending portion extends beyond an edge of the second main surface of the main circuit board; and
the photosensitive device is disposed on a side, proximate to a plane where the first main surface of the main circuit board is located, of the extending portion of the auxiliary circuit board.

### Claim 3 (depends on 1)

The backlight driving board according to claim 1, further comprising:
a second port disposed on the auxiliary circuit board, the photosensitive device being coupled to the second port; and
a third port disposed on the main circuit board, the third port being coupled to the second port, the backlight controller and the first port.

### Claim 4 (depends on 3)

The backlight driving board according to claim 3, further comprising:
a terminal line, the second port being coupled to the third port through the terminal line.

### Claim 5 (depends on 1)

The backlight driving board according to claim 1, wherein the photosensitive device includes:
a sensing element configured to sense a light-emitting state of the light source, and output sensing data; and
a chip coupled to the sensing element, the chip being configured to process the sensing data, and output the brightness data and the color temperature data.

### Claim 6 (depends on 1)

The backlight driving board according to claim 1, wherein: the backlight controller is configured to output a brightness adjustment signal according to the brightness data; and
the backlight driving board further comprises:
a light source driver disposed on the main circuit board, the light source driver being coupled to the backlight controller, and the light source driver being configured to receive the brightness adjustment signal, and adjust the light-emitting brightness of the light source according to the brightness adjustment signal; and
a fourth port disposed on the main circuit board, the fourth port being configured to couple the light source driver to the light source.

### Claim 7 (depends on 1)

The backlight driving board according to claim 1, wherein the photosensitive device is an ambient light sensor.

### Claim 8 (depends on 1)

A backlight module, comprising:
a backplane;
the light source disposed on a side of the backplane; and
the backlight driving board according to claim 1, the backlight driving board being disposed on a side of the backplane away from the light source, wherein:
the backplane has an opening at a position corresponding to the photosensitive device of the backlight driving board; and a sensing end of the photosensitive device extends into the opening, so as to sense the brightness and the color temperature of the light source.

### Claim 9 (depends on 8)

A display apparatus, comprising:
the backlight module according to claim 8;
the display panel disposed on a light-exit surface of the backlight module; and
the system board, the system board being coupled to the first port of the backlight driving board in the backlight module, and the display panel, and the system board being configured to receive the color temperature data from the first port, and adjust the color temperature of the picture displayed by the display panel according to the color temperature data.

### Claim 10 (depends on 9)

The display apparatus according to claim 9, wherein: the system board is configured to adjust display data required for the display panel to display the picture according to the color temperature data, and output adjusted display data; and
the display apparatus further comprises:
a timing controller, the system board being coupled to the display panel through the timing controller, and the timing controller being configured to control the display panel to display the picture according to the adjusted display data.

### Claim 11

A backlight module, comprising:
a backplane;
the light source disposed on a side of the backplane; and
a backlight driving board, the backlight driving board being disposed on a side of the backplane away from the light source, wherein:
the backlight driving board includes:
a main circuit board;
a photosensitive device disposed on the main circuit board, the photosensitive device being configured to sense a brightness and a color temperature of a light source, and output brightness data and color temperature data;
a backlight controller disposed on the main circuit board, the backlight controller being coupled to the photosensitive device, and configured to receive the brightness data and adjust a light-emitting brightness of the light source according to the brightness data; and
a first port disposed on the main circuit board, the first port being coupled to the photosensitive device, and configured to be coupled to a system board, receive the color temperature data, and transmit the color temperature data to the system board, such that the system board adjusts a color temperature of a picture displayed by a display panel according to the color temperature data; and
the backplane has an opening at a position corresponding to the photosensitive device of the backlight driving board, and a sensing end of the photosensitive device extends into the opening, so as to sense the brightness and the color temperature of the light source.

### Claim 12 (depends on 11)

A display apparatus, comprising:
the backlight module according to claim 11;
the display panel disposed on a light-exit surface of the backlight module; and
the system board, the system board being coupled to the first port of the backlight driving board in the backlight module, and the display panel, and the system board being configured to receive the color temperature data from the first port, and adjust the color temperature of the picture displayed by the display panel according to the color temperature data.

### Claim 13 (depends on 12)

The display apparatus according to claim 12, wherein: the system board is configured to adjust display data required for the display panel to display the picture according to the color temperature data, and output adjusted display data; and
the display apparatus further comprises:
a timing controller, the system board being coupled to the display panel through the timing controller, and the timing controller being configured to control the display panel to display the picture according to the adjusted display data.

### Claim 14 (depends on 12)

A method for adjusting the brightness and the color temperature of the display apparatus according to claim 12, the method comprising:
sensing, by the photosensitive device of the backlight driving board in the backlight module, the brightness and the color temperature of the light source of the backlight module;
outputting, by the photosensitive device, the brightness data and the color temperature data;
receiving, by the backlight controller of the backlight driving board, the brightness data;
adjusting, by the backlight controller, the light-emitting brightness of the light source according to the brightness data;
receiving, by the system board, the color temperature data; and
adjusting, by the system board, the color temperature of the picture displayed by the display panel according to the color temperature data.

### Claim 15 (depends on 14)

The method according to claim 14, wherein: the backlight driving board further includes a light source driver; and
receiving, by the backlight controller of the backlight driving board, the brightness data, and adjusting, by the backlight controller, the light-emitting brightness of the light source according to the brightness data includes:
receiving, by the backlight controller, the brightness data;
outputting, by the backlight controller, a brightness adjustment signal according to the brightness data;
receiving, by the light source driver, the brightness adjustment signal; and
adjusting, by the light source driver, the light-emitting brightness of the light source according to the brightness adjustment signal.

### Claim 16 (depends on 14)

The method according to claim 14, wherein: the display apparatus further includes a timing controller; and
receiving, by the system board, the color temperature data, and adjusting, by the system board, the color temperature of the picture displayed by the display panel according to the color temperature data includes:
receiving, by the system board, the color temperature data;
adjusting, by the system board, display data required for the display panel to display the picture according to the color temperature data;
outputting, by the system board, adjusted display data; and
controlling, by the timing controller, the display panel to display the picture according to the adjusted display data.

### Claim 17 (depends on 14)

The method according to claim 14, wherein: the photosensitive device includes a sensing element and a chip; and
sensing, by the photosensitive device of the backlight driving board in the backlight module, the brightness and the color temperature of the light source of the backlight module, and outputting, by the photosensitive device, the brightness data and the color temperature data includes:
sensing, by the sensing element, a light-emitting state of the light source;
outputting, by the sensing element, sensing data;
processing, by the chip, the sensing data; and
outputting, by the chip, the brightness data and the color temperature data.

### Claim 18 (depends on 17)

The method according to claim 17, wherein: processing, by the chip, the sensing data, and outputting, by the chip, the brightness data and the color temperature data includes:
obtaining, by the chip, XYZ data corresponding to the sensing data according to a coefficient matrix that characterizes a relationship between red-green-blue (RGB) data and the XYZ data, wherein the sensing data is the RGB data, and the XYZ data is tristimulus values of RGB three primary colors;
outputting, by the chip, a Y value of the XYZ data corresponding to the sensing data as the brightness data;
obtaining, by the chip, color coordinates according to the XYZ data corresponding to the sensing data;
calculating, by the chip, the color temperature data according to the color coordinates; and
outputting, by the chip, the color temperature data.