Granted Patent B2

US 12,633,249 · App. 18/650,399 · Granted May 19, 2026

Inventors: Seokha Hong (Yongin-si, KR); Hyungjin Kim (Yongin-si, KR); Jong-Woong Park (Yongin-si, KR); Kanghee Lee (Yongin-si, KR); Kyungsu Lee (Yongin-si, KR)

Assignee: SAMSUNG DISPLAY CO., LTD.

G09G3/32G09G2300/0819G09G2300/0842G09G2310/04G09G2310/08G09G2320/045G09G2320/048G09G2330/021G09G2340/0435

Abstract

Claims (79)

1 . A display device comprising:

a display panel including a first display region and a second display region; and

a driving controller configured to receive an image signal and a control signal, output an image data signal to be provided to the display panel, drive the first display region of the display panel at a first driving frequency, and drive the second display region at a second driving frequency lower than the first driving frequency,

wherein the display panel includes first horizontal lines corresponding to the first display region and second horizontal lines corresponding to the second display region, and

wherein the driving controller is configured to:

count a first stress time of each of the first horizontal lines, and calculate a first operating time of each of the first horizontal lines based on the first stress time and the first driving frequency,

count a second stress time of each of the second horizontal lines and calculate a second operating time of each of the second horizontal lines based on the second stress time and the second driving frequency, and

output the image data signal obtained by compensating for stress for the image signal based on the image signal, the first operating time, and the second operating time,

wherein the second operating time of each of the second horizontal lines has a value of the second stress time divided by the second driving frequency, and the second stress time is a number of the second horizontal lines or a total number of the first horizontal lines and the second horizontal lines.

2 . The display device of claim 1 , wherein the driving controller is configured to:

output the image data signal obtained by compensating for the stress for the image signal corresponding to the first horizontal lines based on the image signal and the first operating time of each of the first horizontal lines.

3 . The display device of claim 1 , wherein the driving controller is configured to:

output the image data signal obtained by compensating for the stress for the image signal corresponding to the second horizontal lines based on the image signal and the second operating time of each of the second horizontal lines.

4 . The display device of claim 1 , wherein the driving controller includes:

a stress time calculating unit configured to count the first stress time of each of the first horizontal lines, and count the second stress time of each of the second horizontal lines;

a memory configured to store previous stress data of a previous frame; and

a compensating unit configured to calculate stress data of a present frame based on the image signal, the previous stress data, the first operating time, and the second operating time, and output the image data signal corresponding to the image signal based on the stress data, and

wherein the stress data from the compensating unit is stored in the memory, as the previous stress data for a next frame.

5 . The display device of claim 4 , wherein the stress time calculating unit includes:

first counters corresponding to the first horizontal lines and configured to output the first stress time;

second counters corresponding to the second horizontal lines and configured to output the second stress time; and

a counter controller configured to control the first counters and the second counters in response to the control signal.

6 . The display device of claim 5 , wherein the control signal includes a start signal indicating starting of each of frames, and

wherein the stress time calculating unit controls the first counters and the second counters in response to the start signal.

7 . The display device of claim 6 , wherein the frames include:

a full driving frame for driving the first horizontal lines and the second horizontal lines; and

a masking enable frame for driving only the first horizontal lines of the first and second horizontal lines.

8 . The display device of claim 7 , wherein the counter controller is configured to:

control the first counters to count up during the full driving frame and the masking enable frame, and to control the second counters to count up during the masking enable frame.

9 . The display device of claim 8 , wherein each of the first counters is reset when a corresponding horizontal line is driven among the first horizontal lines, and

wherein each of the second counters is reset when a corresponding horizontal line is driven among the second horizontal lines.

10 . A display device comprising:

a display panel including a first display region and a second display region; and

a driving controller configured to receive an image signal and a control signal, output an image data signal to be provided to the display panel, drive the first display region of the display panel at a first driving frequency in a multi-frequency mode, and drive the second display region at a second driving frequency lower than the first driving frequency, in the multi-frequency mode,

wherein the display panel includes first horizontal lines corresponding to the first display region and second horizontal lines corresponding to the second display region, and

wherein the driving controller is configured to: in the multi-frequency mode,

count a first stress time of each of the first horizontal lines and calculate a first operating time of each of the first horizontal lines based on the first stress time and the first driving frequency,

count a second stress time of each of the second horizontal lines and calculate a second operating time of each of the second horizontal lines based on the second stress time and the second driving frequency, and

output the image data signal obtained by compensating for a stress for the image signal based on the image signal, the first operating time, and the second operating time,

wherein the second operating time has a value of the second stress time divided by the second driving frequency, the second stress time is a number of the second horizontal lines in the multi-frequency mode and the second stress time is a total number of the first horizontal lines and the second horizontal lines in a single-frequency mode.

11 . The display device of claim 10 , wherein the driving controller is configured to: in the multi-frequency mode,

compensate for the stress for the image signal corresponding to the first horizontal lines based on the image signal and the first operating time of each of the first horizontal lines, and

output the image data signal obtained by compensating for the stress for the image signal corresponding to the second horizontal lines based on the image signal and the second operating time of each of the second horizontal lines.

12 . The display device of claim 10 , wherein the driving controller is configured to: in the single-frequency mode,

count a third stress time of each of the first horizontal lines and the second horizontal lines and calculate a third operating time of each of the first horizontal lines and the second horizontal lines based on the third stress time and the first driving frequency, and

output the image data signal obtained by compensating for the stress for the image signal based on the image signal and the third operating time.

13 . The display device of claim 10 , wherein the driving controller includes:

a stress time calculating unit configured to count the first stress time of each of the first horizontal lines, and count the second stress time of each of the second horizontal lines;

a memory configured to store previous stress data of a previous frame; and

a compensating unit configured to calculate stress data of a present frame based on the image signal, the previous stress data, the first operating time, and the second operating time, and output the image data signal corresponding to the image signal based on the stress data, and

wherein the stress data from the compensating unit is stored in the memory, as the previous stress data for a next frame.

14 . The display device of claim 13 , wherein the stress time calculating unit includes:

first counters corresponding to the first horizontal lines and configured to output the first stress time;

second counters corresponding to the second horizontal lines and configured to output the second stress time; and

a counter controller configured to control the first counters and the second counters, in response to the control signal.

15 . The display device of claim 14 , wherein the control signal includes a start signal indicating starting of each of frames, and

wherein the stress time calculating unit controls the first counters and the second counters in response to the start signal.

16 . The display device of claim 15 , wherein the frames include a full driving frame for driving the first horizontal lines and the second horizontal lines, and a masking enable frame for driving only the first horizontal lines of the first and second horizontal lines, and

wherein the counter controller is configured to:

control the first counters to count up during the full driving frame and the masking enable frame, and to control the second counters to count up during the masking enable frame.

17 . An electronic device comprising:

a display panel including a first display region and a second display region; and

a driving controller configured to receive an image signal and a control signal, output an image data signal to be provided to the display panel, drive the first display region of the display panel at a first driving frequency, and drive the second display region at a second driving frequency lower than the first driving frequency,

wherein the display panel includes first horizontal lines corresponding to the first display region and second horizontal lines corresponding to the second display region,

wherein the driving controller includes:

a stress time calculating unit configured to count a first stress time of each of the first horizontal lines, and count a second stress time of each of the second horizontal lines;

a memory configured to store previous stress data of a previous frame; and

a compensating unit configured to calculate stress data of a present frame based on the image signal, the previous stress data, a first operating time, and a second operating time, and output the image data signal corresponding to the image signal based on the stress data, and

wherein the stress data from the compensating unit is stored in the memory, as the previous stress data for a next frame,

wherein the second operating time of each of the second horizontal lines has a value of the second stress time divided by the second driving frequency, and the second stress time is a number of the second horizontal lines or a total number of the first horizontal lines and the second horizontal lines.

18 . The electronic device of claim 17 , wherein the stress time calculating unit includes:

first counters corresponding to the first horizontal lines and configured to output the first stress time;

second counters corresponding to the second horizontal lines and configured to output the second stress time; and

a counter controller configured to control the first counters and the second counters, in response to the control signal.

19 . The electronic device of claim 18 , wherein the control signal includes a start signal indicating starting of each of frames, and

wherein the stress time calculating unit controls the first counters and the second counters, in response to the start signal.

20 . The electronic device of claim 19 , wherein the frames include a full driving frame for driving the first horizontal lines and the second horizontal lines, and a masking enable frame for driving only the first horizontal lines of the first and second horizontal lines, and

wherein the counter controller is configured to:

control the first counters to count up during the full driving frame and the masking enable frame, and to control the second counters to count up during the masking enable frame.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (21)