DISPLAY DEVICE AND ELECTRONIC DEVICE HAVING THE SAME

• US 20200135100A1
• Filed: 10/01/2019
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: PARK, Seung Ho
• Granted Patent: US 11,132,948 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2310/0232 Special driving of display border areas
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/048 using evaluation of the usage time
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element

Abstract

A display device includes a display panel including a plurality of pixels, a data driver configured to generate a data voltage provided to the pixels, a light stress compensator configured to determine whether a pixel of the pixels satisfies a light stress condition based on an input image data, and to output a data voltage control signal that changes a voltage level of the data voltage provided to the pixel that satisfies the light stress condition, a scan driver configured to generate a scan signal provided to the pixels, and a timing controller configured to generate a control signal that controls the data driver and the scan driver.

Claims

1. A display device comprising:

a display panel comprising a plurality of pixels;

a data driver configured to generate a data voltage provided to the pixels;

a light stress compensator configured to determine whether a pixel of the pixels satisfies a light stress condition based on an input image data, and to output a data voltage control signal that changes a voltage level of the data voltage provided to the pixel that satisfies the light stress condition;

a scan driver configured to generate a scan signal provided to the pixels; and

a timing controller configured to generate a control signal that controls the data driver and the scan driver.

2. The display device of claim 1, wherein the light stress compensator comprises:

a light stress determiner configured to determine that the pixel satisfies the light stress condition when at least one of sub-pixels of the pixel emits light and at least one other of the sub-pixels of the pixel emits no light; and

a data voltage controller configured to generate the data voltage control signal that changes the voltage level of the data voltage provided to the sub-pixel that emits no light, the sub-pixel being of the pixel that satisfies the light stress condition.

3. The display device of claim 2, wherein the light stress determiner is configured to determine that the sub-pixel emits light when the sub-pixel displays light having a grayscale value greater than a first grayscale value, and to determine that the sub-pixel emits no light when the sub-pixel displays light having 0 grayscale value.

4. The display device of claim 2, wherein the light stress determiner is configured to determine that the sub-pixel emits light when the sub-pixel displays light having a grayscale value greater than a first grayscale value, and to determine that the sub-pixel emits no light when the sub-pixel displays light having a grayscale value less than a second grayscale value.

5. The display device of claim 4, wherein the data voltage controller comprises a lookup table (LUT) storing the data voltage control signal corresponding to the grayscale value of the sub-pixel that emits no light.

6. The display device of claim 2, wherein the light stress determiner comprises a time duration determiner configured to measure a time duration for which the pixel satisfies the light stress condition.

7. The display device of claim 6, wherein the data voltage controller is configured to generate the data voltage control signal that changes the voltage level of the data voltage, according to the time duration.

8. The display device of claim 2, wherein the data voltage controller is configured to periodically output the data voltage control signal.

9. The display device of claim 2, wherein the data voltage controller is configured to non-periodically output the data voltage control signal.

10. The display device of claim 2, wherein the data voltage controller is configured to continuously output the data voltage control signal.

11. The display device of claim 2, wherein the data voltage controller is configured to non-continuously output the data voltage control signal.

12. The display device of claim 1, wherein the light stress compensator comprises:

a logo detector configured to detect a logo area where a logo is displayed based on the input image data; and

a data voltage controller configured to generate the data voltage control signal that changes the voltage level of the data voltage provided to a sub-pixel that emits no light, the sub-pixel being of a pixel of the pixels in the logo area.

13. The display device of claim 12, wherein the logo detector is configured to detect a peripheral area that surrounds the logo area, and to change the voltage level of the data voltage provided to the sub-pixel that emits no light, the sub-pixel being of a pixel of the pixels in the logo area or the peripheral area.

14. An electronic device comprises a display device and a processor that controls the display device, the display device comprising:

a display panel comprising a plurality of pixels;

a data driver configured to generate a data voltage provided to the pixels;

a light stress compensator configured to determine whether a pixel of the pixels satisfies a light stress condition based on an input image data, and to output a data voltage control signal that changes a voltage level of the data voltage provided to the pixel that satisfies the light stress condition;

a scan driver configured to generate a scan signal provided to the pixels; and

a timing controller configured to generate a control signal that controls the data driver and the scan driver.

15. The electronic device of claim 14, wherein the light stress compensator comprises:

a light stress determiner configured to determine that the pixel satisfies the light stress condition when at least one of sub-pixels of the pixel emits light and at least one other of the sub-pixels of the pixel emits no light; and

a data voltage controller configured to generate the data voltage control signal that changes the voltage level of the data voltage provided to the at least one other of the sub-pixels.

16. The electronic device of claim 15, wherein the light stress determiner is configured to determine that the sub-pixel emits light when the sub-pixel displays light having a grayscale value greater than a first grayscale value, and to determine that the sub-pixel emits no light when the sub-pixel displays light having 0 grayscale value.

17. The electronic device of claim 15, wherein the light stress determiner is configured to determine that the sub-pixel emits light when the sub-pixel displays light having a grayscale value greater than a first grayscale value, and to determine that the sub-pixel emits no light when the sub-pixel displays light having a grayscale value less than a second grayscale value.

18. The electronic device of claim 15, wherein the light stress determiner comprises a time duration determiner configured to measure a time duration for which the pixel satisfies the light stress condition, and

wherein the data voltage controller is configured to generate the data voltage control signal that changes the voltage level of the data voltage as the time duration increases.

19. The electronic device of claim 14, wherein the light stress compensator comprises:

a logo detector configured to detect a logo area where a logo is displayed based on the input image data; and

a data voltage controller configured to generate the data voltage control signal that changes the voltage level of the data voltage provided to a sub-pixel that emits no light, the sub-pixel being of a pixel of the pixels in the logo area.

20. The electronic device of claim 19, wherein the logo detector is configured to detect a peripheral area that surrounds the logo area, and to change the voltage level of the data voltage provided to the sub-pixel that emits no light, the sub-pixel being of a pixel of the pixels in the logo area or the peripheral area.