# US 11,908,401 B2 · Driving controller, display apparatus including the same and method of driving display panel using the same

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- Number: US 11,908,401 B2
- Document ID: US11908401B2
- Status: Granted
- Kind: B2
- Application number: 18/183,124
- Filed: 2023-03-13
- Published: 2023-07-13
- Granted: 2024-02-20
- Earliest claimed: 2020-04-16
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Eunjin Choi; Wonjin Seo; Kihyun Pyun
- Web page: https://patentgrep.com/patent/US11908401B2

## CPC

- G09G 3/2007: {Display of intermediate tones}
- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- G09G 2310/0275: Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G 2320/04: Maintaining the quality of display appearance
- G09G 2320/043: Preventing or counteracting the effects of ageing
- G09G 2320/046: Dealing with screen burn-in prevention or compensation of the effects thereof
- G09G 2320/048: using evaluation of the usage time
- G09G 2320/062: Adjustment of illumination source parameters
- G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours
- 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 driving controller includes: a logo determiner configured to determine whether or not input image data includes a logo; a logo grayscale value calculator configured to calculate a logo grayscale value of a logo area corresponding to the logo in response to the input image data including the logo; a light emitting element life expectancy determiner configured to determine a life expectancy of a light emitting element corresponding to the logo area; a compensation reference grayscale value generator configured to determine a compensation reference grayscale value according to the life expectancy of the light emitting element corresponding to the logo area; and a logo luminance compensator configured to compare the logo grayscale value to the compensation reference grayscale value to determine whether or not to compensate a luminance of the logo area.

## Claims

### Claim 1

A driving controller comprising:
a logo determiner configured to determine whether or not input image data includes a logo;
a logo grayscale value calculator configured to calculate a logo grayscale value of a logo area corresponding to the logo in response to the input image data including the logo;
a light emitting element life expectancy determiner configured to determine a life expectancy of a light emitting element corresponding to the logo area;
a compensation reference grayscale value generator configured to determine a compensation reference grayscale value according to the life expectancy of the light emitting element corresponding to the logo area; and
a logo luminance compensator configured to compare the logo grayscale value to the compensation reference grayscale value to determine whether or not to compensate a luminance of the logo area,
wherein the logo determiner is configured to determine that the input image data includes the logo in response to a fixed image being maintained over a reference time period and a size of the fixed image being included in a reference size range.

### Claim 2 (depends on 1)

The driving controller of claim 1, wherein the logo determiner is configured to compare a grayscale value of a previous frame of the input image data and a grayscale value of a present frame of the input image data to determine the fixed image is included in the input image data.

### Claim 3 (depends on 2)

The driving controller of claim 2, wherein the logo determiner is configured to determine that the input image data includes the logo in response to the fixed image being maintained over the reference time period.

### Claim 4 (depends on 1)

The driving controller of claim 1, wherein the light emitting element life expectancy determiner is configured to extract the life expectancy of the light emitting element of a display block corresponding to the logo area among a plurality of display blocks of a display panel.

### Claim 5 (depends on 1)

The driving controller of claim 1, wherein the light emitting element life expectancy determiner is configured to determine a number of display blocks corresponding to the logo area among a plurality of display blocks of a display panel.

### Claim 6 (depends on 5)

The driving controller of claim 5, wherein the light emitting element life expectancy determiner is configured to extract the life expectancy of the light emitting element of a display block corresponding to the logo area in response to a number of the display blocks corresponding to the logo area being one.

### Claim 7 (depends on 5)

The driving controller of claim 5, wherein the light emitting element life expectancy determiner is configured to extract a minimum life expectancy of light emitting elements of the display blocks corresponding to the logo areas in response to the number of the display blocks corresponding to the logo area being greater than one.

### Claim 8 (depends on 1)

The driving controller of claim 1, wherein the compensation reference grayscale value generator is configured to set the compensation reference grayscale value in proportion to the life expectancy of the light emitting element along a predetermined curve.

### Claim 9 (depends on 8)

The driving controller of claim 8, wherein the compensation reference grayscale value generator is configured to set the compensation reference grayscale value to a minimum preset reference grayscale value in response to the life expectancy of the light emitting element corresponding to the logo area being less than a minimum preset life expectancy.

### Claim 10 (depends on 8)

The driving controller of claim 8, wherein the compensation reference grayscale value generator is configured to set the compensation reference grayscale value to a maximum preset reference grayscale value in response to the life expectancy of the light emitting element corresponding to the logo area being greater than a maximum preset life expectancy.

### Claim 11

A display apparatus comprising:
a display panel configured to display an image based on input image data;
a driving controller configured to generate a data signal based on the input image data, the driving controller comprising:
a logo determiner configured to determine whether or not the input image data includes a logo;
a logo grayscale value calculator configured to calculate a logo grayscale value of a logo area corresponding to the logo in response to the input image data including the logo;
a light emitting element life expectancy determiner configured to determine a life expectancy of a light emitting element corresponding to the logo area;
a compensation reference grayscale value generator configured to determine a compensation reference grayscale value according to the life expectancy of the light emitting element corresponding to the logo area;
a logo luminance compensator configured to compare the logo grayscale value to the compensation reference grayscale value to determine whether or not to compensate a luminance of the logo area; and
a data driver configured to convert the data signal to a data voltage and to output the data voltage to the display panel,
wherein the logo determiner is configured to determine that the input image data includes the logo in response to a fixed image being maintained over a reference time period and a size of the fixed image being included in a reference size range.

### Claim 12 (depends on 11)

The display apparatus of claim 11, wherein the driving controller and the data driver form an integrated driver.

### Claim 13 (depends on 11)

The display apparatus of claim 11, wherein the compensation reference grayscale value generator is configured to set the compensation reference grayscale value in proportion to the life expectancy of the light emitting element corresponding to the logo area.

### Claim 14 (depends on 13)

The display apparatus of claim 13, wherein the compensation reference grayscale value generator is configured to set the compensation reference grayscale value to a minimum preset reference grayscale value in response to the life expectancy of the light emitting element corresponding to the logo area being less than a minimum preset life expectancy.

### Claim 15 (depends on 13)

The display apparatus of claim 13, wherein the compensation reference grayscale value generator is configured to set the compensation reference grayscale value to a maximum preset reference grayscale value in response to the life expectancy of the light emitting element corresponding to the logo area being greater than a maximum preset life expectancy.

### Claim 16

A method of driving a display panel, the method comprising:
determining whether or not input image data includes a logo;
calculating a logo grayscale value of a logo area corresponding to the logo in response to the input image data including the logo;
determining a life expectancy of a light emitting element corresponding to the logo area;
determining a compensation reference grayscale value according to the life expectancy of the light emitting element corresponding to the logo area;
comparing the logo grayscale value to the compensation reference grayscale value to compensate a luminance of the logo area;
generating a data signal based on the input image data having the compensated luminance of the logo area;
converting the data signal to a data voltage; and
outputting the data voltage to the display panel,
wherein the input image data is determined to include the logo in response to a fixed image being maintained over a reference time period and a size of the fixed image being included in a reference size range.