Display apparatus and method of driving display apparatus

Patent metadata

Field	Value
Publication number	US-12175944-B2
Application number	US-202218145078-A
Country	US
Kind code	B2
Filing date	Dec 22, 2022
Priority date	Dec 21, 2020
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A display apparatus includes a display panel, a compensator, a controller, and a data driver. The compensator determines a degradation grayscale of a compensation region of the display panel. The degradation grayscale may be determined based on a driving time of at least one pixel in the compensation region and degradation data corresponding to the at least one pixel. The controller generates compensated image data for input image data based on the degradation grayscale. The data driver provides a data voltage to the at least one pixel based on the compensated image data.

First claim

What is claimed is:

1. A display apparatus, comprising:
a display panel including a plurality of pixels; and
a display panel driver configured to determine a degradation grayscale of a compensation region of the display panel, configured to generate compensated image data for input image data based on the degradation grayscale and configured to provide a data voltage to at least one pixel of the plurality of pixels based on the compensated image data,
wherein the degradation grayscale is determined based on a driving time of the at least one pixel in the compensation region and degradation data corresponding to the at least one pixel.

2. The display apparatus of claim 1 , wherein:
the display panel driver comprises a compensator and a controller,
the compensator calculates a compensation value of a characteristic value deviation of the compensation region based on the degradation grayscale, and outputs the compensation value to the controller,
the controller is configured to compensate the input image data based on the compensation value, and
the compensator comprises:
a driving time counter which counts the driving time of the at least one pixel;
a degradation data generator which generates the degradation data of the at least one pixel based on sensed data;
a degradation grayscale determiner which determines the degradation grayscale of the compensation region based on the driving time of the at least one pixel and the degradation data of the pixel; and
a compensation value calculator which calculates the compensation value of the characteristic value deviation of the compensation region.

3. The display apparatus of claim 2 , wherein the degradation grayscale determiner calculates a degradation time change ratio by dividing the degradation data of the at least one pixel by the driving time of the at least one pixel.

4. The display apparatus of claim 3 , wherein the degradation grayscale determiner:
calculates a degradation time change ratio constant by dividing the degradation time change ratio by a reference degradation time change ratio, and
determines the degradation grayscale based on the degradation time change ratio constant.

5. The display apparatus of claim 2 , wherein the compensation value calculator calculates the compensation value by selectively applying a characteristic value compensation model corresponding to the degradation grayscale among a plurality of characteristic value compensation models.

6. The display apparatus of claim 5 , wherein the compensation value calculator includes a lookup table which stores the plurality of the characteristic value compensation models corresponding to the degradation grayscales.

7. The display apparatus of claim 2 , further comprising:
a sensing circuit connected to a plurality of sensing lines,
wherein the data driver is configured to provide a reference voltage to the at least one pixel using a plurality of data lines, and
the sensing circuit is configured to receive a sensed voltage from the at least one pixel using the plurality of the sensing lines and generate the sensed data corresponding to a difference between the reference voltage and the sensed voltage.

8. The display apparatus of claim 7 , wherein the controller is configured to:
receive the sensed data from the sensing circuit, and
transmit the sensed data to the compensator.

9. The display apparatus of claim 2 , wherein the driving time counter:
counts a driving time of the display panel from a starting time to an ending time of driving of the display panel, and
determines the driving time of the display panel as the driving time of the at least one pixel.

10. The display apparatus of claim 2 , wherein the compensation region on the display panel is set by a user.

11. A display panel driver, comprising:
a compensator determines a degradation grayscale of a compensation region of a display panel, the degradation grayscale determined based on a driving time of at least one pixel in the compensation region and degradation data corresponding to the at least one pixel;
a controller configured to generate compensated image data for input image data based on the degradation grayscale; and
a data driver configured to provide a data voltage to the at least one pixel based on the compensated image data.

12. The display panel driver of claim 11 , wherein:
the compensator is calculates a compensation value of a characteristic value deviation of the compensation region based on the degradation grayscale, and to output the compensation value to the controller,
the controller is configured to compensate the input image data based on the compensation value, and
the compensator comprises:
a driving time counter which counts the driving time of the at least one pixel;
a degradation data generator which generates the degradation data of the at least one pixel based on sensed data;
a degradation grayscale determiner which determines the degradation grayscale of the compensation region based on the driving time of the at least one pixel and the degradation data of the pixel; and
a compensation value calculator which calculates the compensation value of the characteristic value deviation of the compensation region.

13. The display panel driver of claim 12 , wherein the degradation grayscale determiner calculates a degradation time change ratio by dividing the degradation data of the at least one pixel by the driving time of the at least one pixel.

14. The display panel driver of claim 13 , wherein the degradation grayscale determiner:
calculates a degradation time change ratio constant by dividing the degradation time change ratio by a reference degradation time change ratio, and
determines the degradation grayscale based on the degradation time change ratio constant.

15. The display panel driver of claim 12 , wherein the compensation value calculator calculates the compensation value by selectively applying a characteristic value compensation model corresponding to the degradation grayscale among a plurality of characteristic value compensation models.

16. The display panel driver of claim 15 , wherein the compensation value calculator includes a lookup table which stores the plurality of the characteristic value compensation models corresponding to the degradation grayscales.

17. The display panel driver of claim 12 , further comprising:
a sensing circuit configured to receive a sensed voltage from the at least one pixel and generate the sensed data corresponding to a difference between a reference voltage and the sensed voltage,
wherein the data driver is configured to provide the reference voltage to the at least one pixel.

18. The display panel driver of claim 17 , wherein the controller is configured to:
receive the sensed data from the sensing circuit, and
transmit the sensed data to the compensator.

19. The display panel driver of claim 12 , wherein the driving time counter:
counts a driving time of the display panel from a starting time to an ending time of driving of the display panel, and
determines the driving time of the display panel as the driving time of the at least one pixel.

Assignees

• Samsung Display Co Ltd

Inventors

• Ban Seokgyu
• Lee Wook
• Shin Jaehoon

Classifications

• G09G2310/027

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• G09G2320/0285

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• G09G2330/045

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• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G3/3275

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