# US 12,183,245 B2 · Optical compensating system and method

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- Number: US 12,183,245 B2
- Document ID: US12183245B2
- Status: Granted
- Kind: B2
- Application number: 18/523,299
- Filed: 2023-11-29
- Published: 2024-08-01
- Granted: 2024-12-31
- Earliest claimed: 2023-01-27
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: JaeSung Jeon; Hyeonju Park; Hyeonwoo Lee
- Web page: https://patentgrep.com/patent/US12183245B2

## CPC

- G09G 3/2007: {Display of intermediate tones}
- G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)}
- G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)}
- G09G 2320/0626: for control of overall brightness
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- 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: 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

Embodiments of the disclosure relate to an optical compensating system and method. Specifically, there may be provided an optical compensating method, comprising generating a first photographed image for a first area of a display panel including an overlapping area, generating a second photographed image for a second area of the display panel including the overlapping area, extracting a camera gamma value for the second area, calculating a reference grayscale value in the overlapping area, using the camera gamma value for the second area, generating a corrected luminance value of the overlapping area by applying weights on the basis of the position to the reference grayscale value, generating compensation data from the corrected luminance value, and transmitting the compensation data to a display device.

## Claims

### Claim 1

An optical compensating method, comprising:
generating a first photographed image for a first area of a display panel including an overlapping area;
generating a second photographed image for a second area of the display panel including the overlapping area;
extracting a camera gamma value for the second area;
calculating a reference grayscale value in the overlapping area, using the camera gamma value for the second area;
generating a corrected luminance value of the overlapping area by applying a weight on the basis of a position to the reference grayscale value;
generating compensation data from the corrected luminance value; and
transmitting the compensation data to a display device.

### Claim 2 (depends on 1)

The optical compensating method of claim 1, wherein the overlapping area extends from a reference line of the display panel to the second area by a determined distance.

### Claim 3 (depends on 1)

The optical compensating method of claim 1, wherein the reference line is a center line of the display panel.

### Claim 4 (depends on 1)

The optical compensating method of claim 1, wherein the second photographed image is generated for two or more times at different grayscale levels in a low-grayscale area of 40 grayscale or less or in a high-grayscale area of 150 grayscale or more.

### Claim 5 (depends on 4)

The optical compensating method of claim 4, wherein the second photographed image is photographed, for a same exposure time, at a first low-grayscale level of 32 grayscale and a second low-grayscale level of 36 grayscale.

### Claim 6 (depends on 5)

The optical compensating method of claim 5, wherein the camera gamma value (CGM1) for the low-grayscale area is calculated as
CGM
⁢
1
=
log
⁡
(
CL
⁢
32
CL
⁢
36
)
log
⁡
(
32
36
)
,
wherein CL32 is a camera luminance value of 32 grayscale, and CL36 is a camera luminance value of 36 grayscale.

### Claim 7 (depends on 6)

The optical compensating method of claim 6, wherein the reference grayscale value (GSR) for the overlapping area is calculated as GSR=32×(PL1/PL2)(1/CGM1), wherein PL1 is a luminance value corresponding to the overlapping area in the first photographed image, and PL2 is a luminance value corresponding to the overlapping area in the second photographed image.

### Claim 8 (depends on 4)

The optical compensating method of claim 4, wherein the second photographed image is photographed, for a same exposure time, at a first high-grayscale level of 192 grayscale and a second high-grayscale level of 216 grayscale.

### Claim 9 (depends on 8)

The optical compensating method of claim 8, wherein the camera gamma value (CGM2) for the high-grayscale area is calculated as
CGM
⁢
2
=
log
⁡
(
CL
⁢
192
CL
⁢
216
)
log
⁡
(
192
216
)
,
wherein CL192 is a camera luminance value of 192 grayscale, and CL216 is a camera luminance value of 216 grayscale.

### Claim 10 (depends on 9)

The optical compensating method of claim 9, wherein the reference grayscale value (GSR) for the overlapping area is calculated as GSR=192×(PL1/PL2)(1/CGM2), wherein PL1 is a luminance value corresponding to the overlapping area in the first photographed image, and PL2 is a luminance value corresponding to the overlapping area in the second photographed image.

### Claim 11 (depends on 1)

The optical compensating method of claim 1, wherein generating the corrected luminance value includes:
generating a weighted luminance value by applying a first weight to a luminance value corresponding to the overlapping area in the second photographed image;
generating a reference luminance value by applying a second weight to the reference luminance value; and
adding the weighted luminance value and the reference luminance value,
wherein a sum of the first weight and the second weight is 1.

### Claim 12 (depends on 11)

The optical compensating method of claim 11, wherein in generating the corrected luminance value, at a left boundary of the overlapping area, the first weight is 100% and the second weight is 0%, and at a right boundary of the overlapping area, the first weight is 0% and the second weight is 100%.

### Claim 13 (depends on 12)

The optical compensating method of claim 12, wherein the first weight and the second weight non-linearly vary based on positions between the left boundary and right boundary of the overlapping area.

### Claim 14 (depends on 1)

The optical compensating method of claim 1, wherein the compensation data includes:
first compensation data for a low-grayscale area of 40 grayscale or less; and
second compensation data for a high-grayscale area of 150 grayscale or more.

### Claim 15

An optical compensation device, comprising:
a camera configured to generate a photographed image of a display panel displaying a test image;
a data converting module configured to convert a first photographed image of a first area of the display panel including an overlapping area and a second photographed image of a second area of the display panel including the overlapping area into luminance data;
a camera gamma value generating module configured to generate a camera gamma value from the second photographed image;
a reference grayscale value generating module configured to generate a reference grayscale value of the overlapping area using the camera gamma value;
a corrected luminance value generating module configured to generate a corrected luminance value of the overlapping area by applying weights on the basis of a position to the reference grayscale value;
a compensation data generating module configured to generate compensation data using the corrected luminance value; and
a weight table configured to store the weights.

### Claim 16 (depends on 15)

The optical compensation device of claim 15, further comprising a test image generating module configured to generate the test image.

### Claim 17

A display device, comprising:
a display panel including a plurality of subpixels having a light emitting element;
a gate driving circuit configured to supply a plurality of scan signals to the display panel;
a data driving circuit configured to supply a data voltage to the display panel;
a memory configured to store compensation data; and
a timing controller configured to compensate for the data voltage using the compensation data,
wherein the compensation data is generated by:
generating a first photographed image for a first area of the display panel including an overlapping area;
generating a second photographed image for a second area of the display panel including the overlapping area;
extracting a camera gamma value for the second area;
calculating a reference grayscale value in the overlapping area, using the camera gamma value for the second area;
generating a corrected luminance value of the overlapping area by applying a weight on the basis of a position to the reference grayscale value; and
generating a compensation data from the corrected luminance value.