Method of controlling the transition between different refresh rates on a display device

Patent metadata

Field	Value
Publication number	US-11468833-B2
Application number	US-202117267384-A
Country	US
Kind code	B2
Filing date	Jan 28, 2021
Priority date	Feb 6, 2020
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

An electronic device is provided. The electronic device includes a display panel and a display driver integrated circuit configured to drive the display panel. The display driver integrated circuit is configured to determine a luminance value of the display panel if a request for a change from a current driving frequency of the display panel to a target driving frequency is received, and determine at least one intermediate driving frequency between the current driving frequency and the target driving frequency depending on the luminance value of the display panel.

First claim

The invention claimed is:

1. An electronic device comprising:
a display panel; and
a display driver integrated circuit configured to drive the display panel,
wherein the display driver integrated circuit is further configured to:
determine a luminance value of the display panel when a signal corresponding to a request for a change from a current driving frequency of the display panel to a target driving frequency is received, and
determine at least one intermediate driving frequency between the current driving frequency and the target driving frequency depending on the luminance value of the display panel, and

wherein the display driver integrated circuit is further configured to differently allocate a number of the at least one intermediate driving frequency according to the luminance value of the display panel.

2. The electronic device of claim 1 , wherein the display driver integrated circuit is further configured to differently allocate at least one of a value of the at least one intermediate driving frequency, or a holding time of the at least one intermediate driving frequency, depending on the luminance value of the display panel.

3. The electronic device of claim 2 , wherein the display driver integrated circuit is further configured to allocate a shorter holding time of the at least one intermediate driving frequency as the luminance value of the display panel increases.

4. The electronic device of claim 2 , wherein the display driver integrated circuit is further configured to allocate a longer holding time of the at least one intermediate driving frequency as the luminance value of the display panel decreases.

5. The electronic device of claim 2 , wherein the display driver integrated circuit is further configured to differently determine a first intermediate driving frequency and a second intermediate driving frequency in a situation in which the luminance value of the display panel is the same, the first intermediate driving frequency being allocated when the current driving frequency is greater than the target driving frequency, the second intermediate driving frequency being allocated when the current driving frequency is smaller than the target driving frequency.

6. The electronic device of claim 5 , wherein the display driver integrated circuit is further configured to differently determine a number of frame outputs of the first intermediate driving frequency and the number of frame outputs of the second intermediate driving frequency.

7. The electronic device of claim 1 , wherein the display driver integrated circuit is further configured to allocate a greater number of the at least one intermediate driving frequency as the luminance value of the display panel increases.

8. The electronic device of claim 1 , wherein the display driver integrated circuit is further configured to allocate a smaller number of the at least one intermediate driving frequency as the luminance value of the display panel decreases.

9. The electronic device of claim 1 , wherein the display driver integrated circuit is further configured to control the luminance value of the display panel to be maintained within a predetermined range while the current driving frequency is changed to the target driving frequency through the determined at least one intermediate driving frequency.

10. The electronic device of claim 9 , wherein the display driver integrated circuit is further configured to adjust at least one of a light emission cycle of the display panel at the at least one intermediate driving frequency, a gamma correction table at the at least one intermediate driving frequency, an off ratio of pixels of the display panel, or a driving speed of the display panel, such that the luminance value of the display panel at the at least one intermediate driving frequency is the same or similar to the luminance value at the current driving frequency of the display panel.

11. The electronic device of claim 10 , further comprising:
a memory storing at least one of adjustment tables for adjusting at least one of the light emission cycle of the display panel at the at least one intermediate driving frequency, the gamma correction table at the at least one intermediate driving frequency, the off ratio of pixels of the display panel, or the driving speed of the display panel.

12. The electronic device of claim 11 , wherein the display driver integrated circuit is further configured to:
set the light emission cycle at the at least one intermediate driving frequency to be smaller as the luminance value of the display panel increases, and
set the light emission cycle at the at least one intermediate driving frequency to be greater as the luminance value of the display panel decreases.

13. The electronic device of claim 11 , wherein the display driver integrated circuit is further configured to use a first gamma correction table related to driving the display panel at the current driving frequency and a second gamma correction table related to driving the display panel at the target driving frequency for the gamma correction of the at least one intermediate driving frequency.

14. The electronic device of claim 1 , wherein the display driver integrated circuit is further configured to omit application of the at least one intermediate driving frequency when the luminance value of the display panel is less than or equal to a specified first size or equal to or greater than a specified second size.

15. A driving method for a display, the method comprising:
receiving, by a display driver integrated circuit, a signal corresponding to a request for a change from a current driving frequency of a display panel to a target driving frequency;
determining, by the display driver integrated circuit, a luminance value of the display panel with the receiving of the signal; and
determining, by the display driver integrated circuit, at least one intermediate driving frequency between the current driving frequency and the target driving frequency depending on the luminance value of the display panel,
differently allocating a number of the at least one intermediate driving frequency according to the luminance value of the display panel.

16. The method of claim 15 , wherein the differently allocating includes differently allocating at least one of a value of the at least one intermediate driving frequency, or a holding time of the at least one intermediate driving frequency, depending on the luminance value of the display panel.

17. The method of claim 15 , further comprising:
controlling the luminance value of the display panel to be maintained within a predetermined range while the current driving frequency is changed to the target driving frequency through the determined at least one intermediate driving frequency.

18. The method of claim 17 , wherein the controlling of the luminance value of the display panel includes adjusting at least one of a light emission cycle of the display panel at the at least one intermediate driving frequency, a gamma correction table at the at least one intermediate driving frequency, an off ratio of pixels of the display panel, or a driving speed of the display panel.

19. The method of claim 18 , wherein the adjusting is performed based on at least one of adjustment tables for adjusting at least one of the light emission cycle of the display panel at the at least one intermediate driving frequency, the gamma correction table at the at least one intermediate driving frequency, the off ratio of pixels of the display panel, or the driving speed of th

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Minwoo
• Kim Seungryeol
• Kim Seungjin
• Kim Junghyun
• Yang Byungduk
• Lee Gwanghui
• Lee Seoyoung
• Lee Juseok
• Jung Woojun

Classifications

• G09G2340/0435

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

• G09G2330/021

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

• G09G2320/0606

  Manual adjustment · CPC title

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title