# US 9,520,076 B2 · Method and system for adjusting white balance, method for making liquid crystal display

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- Number: US 9,520,076 B2
- Document ID: US9520076B2
- Status: Granted
- Kind: B2
- Application number: 14/235,546
- Filed: 2014-01-09
- Published: 2015-07-02
- Granted: 2016-12-13
- Earliest claimed: 2013-12-31
- Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Inventors: Jinjun Wu; Chih-tsung Kang
- Web page: https://patentgrep.com/patent/US9520076B2

## CPC

- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- 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 2320/0666: for control of colour parameters, e.g. colour temperature
- G09G 2360/145: the light originating from the display screen
- 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

The present invention provides a method for adjusting white-balance, comprising the steps of: S1, entering a value of white-balance of a standard sample into a display panel; S2, controlling the display panel to display a test image having different grayscale value so as to attain a full grayscale value of the display panel; S3, determining whether the attained full grayscale value is within a specification, if yes, then proceeding into next step, and if no, then proceeding into step S4; and S4, recalculating the white-balance value based on a difference between the attained full grayscale value and the white-balance value of the standard sample, and reentering the calculated white-balance value into display panel, and returning to step S2. The white balance adjusting system incorporated with such white balance adjusting method can be readily and quickly implemented into the existing production line of liquid crystal display panel.

## Claims

### Claim 1

A method for adjusting white-balance, comprising the steps of:
S1, entering a value of white-balance of a standard sample into a display panel;
S2, controlling the display panel to display a test image having different grayscale value so as to attain a full grayscale value of the display panel;
S3, determining whether the attained full grayscale value is within a specification, if yes, then proceeding into next step, and if no, then proceeding into step S4; and
S4, recalculating the white-balance value based on a difference between the attained full grayscale value and the white-balance value of the standard sample, and reentering the calculated white-balance value into display panel, and returning to step S2;
wherein step S2 comprises the following sub-steps:
S21, controlling the test image of the display panel;
S22, collecting brightness and colorfulness of the test image when it is displayed onto the display panel;
S23, converting the brightness and colorfulness under different grayscale into white field chromaticity and gamma value under different grayscale; and
S24, simulating a variation curve based on the white field chromaticity coordinate and gamma value according to the attained white field chromaticity and gamma value under tested grayscale, and attaining the white field chromaticity and gamma value of the display panel under full grayscale.

### Claim 2 (depends on 1)

The method for adjusting white-balance as recited in claim 1, wherein in step S2, the full grayscale data attained thereof is a coordinate value of a white field chromaticity coordinate and a gamma value under the full grayscale value.

### Claim 3 (depends on 1)

The method for adjusting white balance as recited in claim 1, wherein in step S2, a CCD image sensor is used to collect the brightness and colorfulness of the test image displayed on the display panel.

### Claim 4 (depends on 1)

The method for adjusting white balance as recited in claim 1, wherein the test image has 2n number of different grayscale value, in which 0<n≦8, and n is a positive integer.

### Claim 5 (depends on 4)

The method for adjusting white balance as recited in claim 4, wherein the test image has sixteen (16) different values of grayscale.

### Claim 6 (depends on 2)

The method for adjusting white balance as recited in claim 2, wherein the test image has 2n number of different grayscale value, in which 0<n≦8, and n is a positive integer.

### Claim 7 (depends on 1)

The method for adjusting white balance as recited in claim 1, wherein the test image has 2n number of different grayscale value, in which 0<n≦8, and n is a positive integer.

### Claim 8 (depends on 1)

The method for adjusting white balance as recited in claim 1, wherein the specification of the white field chromaticity coordinate is set that the difference between the white field chromaticity coordinate and the white field chromaticity coordinate of the standard sample is located out of ±0.5% of the white field chromaticity of the standard sample; the difference between the gamma value of the display panel and the gamma value of standard sample is within ±0.2.

### Claim 9 (depends on 1)

A method for making liquid crystal display, including assembling liquid crystal display panel and adjusting a white balance of the liquid crystal display panel, wherein the white balance of the liquid crystal display panel is conducted by the method for adjusting white balance as recited in claim 1.

### Claim 10 (depends on 9)

The method for making liquid crystal display as recited in claim 9, wherein in step S2, the full grayscale data attained thereof is a coordinate value of a white field chromaticity coordinate and a gamma value under the full grayscale value.

### Claim 11 (depends on 9)

The method for making liquid crystal display as recited in claim 9, wherein in step S2, a CCD image sensor is used to collect the brightness and colorfulness of the test image displayed on the display panel.

### Claim 12 (depends on 9)

The method for making liquid crystal display as recited in claim 9, wherein the test image has 2n number of different grayscale value, in which 0<n≦8, and n is a positive integer.

### Claim 13 (depends on 12)

The method for making liquid crystal display as recited in claim 12, wherein the test image has sixteen (16) different values of grayscale.

### Claim 14 (depends on 10)

The method for making liquid crystal display as recited in claim 10, wherein the test image has 2n number of different grayscale value, in which 0<n≦8, and n is a positive integer.

### Claim 15 (depends on 9)

The method for making liquid crystal display as recited in claim 9, wherein the test image has 2n number of different grayscale value, in which 0<n≦8, and n is a positive integer.