Electronic device, display device, and driving method thereof

Patent metadata

Field	Value
Publication number	US-12249275-B2
Application number	US-202418613133-A
Country	US
Kind code	B2
Filing date	Mar 22, 2024
Priority date	Jul 20, 2023
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A display device which includes a display panel that includes a first display area and a second display area, and a driving controller. During a multi-frequency mode, the driving controller drives the first display area by using a first driving frequency and drives the second display area by using a second driving frequency. During the multi-frequency mode, when the second driving frequency changes from a first frequency to a second frequency, the driving controller drives the first display area and the second display area during at least one frame by using a base frequency, drives the first display area and the second display area during at least one second frame by using an intermediate frequency between the base frequency and the second frequency, and then drives the first display area by using the first driving frequency and drives the second display area by using the second frequency.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a first display area and a second display area; and
a driving controller configured to receive an image signal and a control signal and to output an image data signal to be provided to the display panel,
wherein, during a multi-frequency mode, the driving controller drives the first display area by using a first driving frequency and drives the second display area by using a second driving frequency different from the first driving frequency,
wherein, during the multi-frequency mode, when the second driving frequency changes from a first frequency to a second frequency, the driving controller is configured to:
drive the first display area and the second display area during at least one frame by using a base frequency;
drive the first display area and the second display area during at least one second frame by using an intermediate frequency between the base frequency and the second frequency; and
during at least one third frame, drive the first display area by using the first driving frequency and drive the second display area by using the second frequency.

2. The display device of claim 1 , wherein the driving controller receives:
a multi-frequency enable signal indicating the multi-frequency mode,
a driving frequency signal indicating a frequency of the second display area for each of a previous frame and a current frame, and
a start location signal indicating a start location of the second display area, for each of the previous frame and the current frame.

3. The display device of claim 2 , wherein, when the multi-frequency enable signal is at a first level, the driving controller operates in the multi-frequency mode.

4. The display device of claim 2 , wherein, when the driving frequency signal of the current frame is different from the driving frequency signal of the previous frame or when the start location signal of the current frame is different from the start location signal of the previous frame, during the at least one frame, the driving controller drives the first display area and the second display area by using the base frequency.

5. The display device of claim 2 , wherein, when the driving frequency signal of the current frame is smaller than or equal to a first value, the driving controller is configured to:
drive the first display area and the second display area during a first intermediate frame, by using a first intermediate frequency between the base frequency and the second frequency; and
during the at least one third frame, drive the first display area by using the first driving frequency and drive the second display area by using the second frequency.

6. The display device of claim 5 , wherein, when the driving frequency signal of the current frame is greater than the first value and is smaller than or equal to a second value, the driving controller is configured to:
drive the first display area and the second display area during the first intermediate frame by using the first intermediate frequency;
drive the first display area and the second display area during a second intermediate frame continuous to the first intermediate frame, by using a second intermediate frequency between the first intermediate frequency and the second frequency; and
during the at least one third frame, drive the first display area by using the first driving frequency and drive the second display area by using the second frequency.

7. The display device of claim 6 , wherein, when the driving frequency signal of the current frame is greater than a second value greater than the first value, the driving controller is configured to:
drive the first display area and the second display area during the first intermediate frame by using the first intermediate frequency;
drive the first display area and the second display area during the second intermediate frame continuous to the first intermediate frame, by using the second intermediate frequency;
drive the first display area and the second display area during a third intermediate frame continuous to the second intermediate frame, by using a third intermediate frequency between the second intermediate frequency and the second frequency; and
during the at least one third frame, drive the first display area by using the first driving frequency and drive the second display area by using the second frequency.

8. The display device of claim 2 , wherein, when the driving frequency signal of the current frame is the same as the driving frequency signal of the previous frame and when the start location signal of the current frame is different from the start location signal of the previous frame, during at least one second frame, the driving controller drives the first display area and the second display area by using the base frequency.

9. The display device of claim 1 , wherein the first driving frequency is higher than or equal to the base frequency.

10. A method of driving a display device, the method comprising:
receiving an image signal corresponding to a first display area and a second display area of a display panel, a multi-frequency enable signal indicating a multi-frequency mode, a driving frequency signal indicating a frequency of the second display area, and a start location signal indicating a start location of the second display area, for each of a previous frame and a current frame;
while the multi-frequency enable signal indicates the multi-frequency mode, comparing the driving frequency signal of the current frame with the driving frequency signal of the previous frame and comparing the start location signal of the current frame with the start location signal of the previous frame;
based on determining the driving frequency signal of the current frame is different from the driving frequency signal of the previous frame or determining the start location signal of the current frame is different from the start location signal of the previous frame, during at least one frame, driving the first display area and the second display area by using a base frequency; and
driving the first display area by using a first driving frequency and driving the second display area by using a second driving frequency corresponding to the driving frequency signal of the current frame.

11. The method of claim 10 , further comprising:
when the driving frequency signal of the current frame is different from the driving frequency signal of the previous frame, comparing the driving frequency signal of the current frame with a first value; and
when the driving frequency signal of the current frame is smaller than or equal to the first value, driving the display panel, and
wherein the driving of the display panel when the driving frequency signal of the current frame is smaller than or equal to the first value includes:
driving the first display area and the second display area by using a first intermediate frequency between the base frequency and the second driving frequency; and
driving the first display area by using the first driving frequency and driving the second display area by the second driving frequency.

12. The method of claim 11 , further comprising:
comparing the driving frequency signal of the current frame with a second value greater than the first value; and
when the driving frequency signal of the current frame is smaller than or equal to the second value, driving the display panel, and
wherein the driving of the display panel when the driving frequency signal of the current frame is smaller than or equal to the second value includes:
driving the first display area and the second display area by using the first intermediate

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Jihye
• Kwon Sangan
• Kim Soon-Dong
• Kim Taehoon
• Roh Seok Hwan
• Yoon Changnoh

Classifications

• G09G3/32 Primary

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

• G09G2330/021

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

• G09G2380/02

  Flexible displays · CPC title

• G09G2340/16

  Determination of a pixel data signal depending on the signal applied in the previous frame · CPC title

• G09G2340/0435

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