Display device

Patent metadata

Field	Value
Publication number	US-2025124851-A1
Application number	US-202418650399-A
Country	US
Kind code	A1
Filing date	Apr 30, 2024
Priority date	Oct 16, 2023
Publication date	Apr 17, 2025
Grant date	—

Abstract

A display device includes: a display panel, and a driving controller to receive an image signal and a control signal, 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. The driving controller counts a first stress time of each of the first horizontal lines, and calculates a first operating time of each of the first horizontal lines based on the first stress time and the first driving frequency, counts a second stress time of each of the second horizontal lines and calculates a second operating time of each of the second horizontal lines based on the second stress time and the second driving frequency, and outputs an 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.

First claim

What is claimed is:

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 different from 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.

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 first 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 different from the first driving frequency, in a 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.

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 a 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 is configured to:
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 first horizontal lines and confi

Assignees

• Samsung Display Co Ltd

Inventors

• Hong Seokha
• Kim Hyungjin
• Park Jong-Woong
• Lee Kanghee
• Lee Kyungsu

Classifications

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2340/0435

  Change or adaptation of the frame rate of the video stream · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title