Display device having multiple driving frequency modes

Patent metadata

Field	Value
Publication number	US-11393404-B2
Application number	US-202117193127-A
Country	US
Kind code	B2
Filing date	Mar 5, 2021
Priority date	Jun 30, 2020
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

A driving controller divides a display panel into first and second display areas according to an operation mode, outputs a start signal indicating a start of one frame and a masking signal for indicating a start of the second display area, sets a basic driving frequency to a normal frequency when the operation mode is a normal frequency mode, sets the basic driving frequency to a frequency lower than the normal frequency when the operation mode is a multi-frequency mode, and outputs the start signal and the masking signal. The first display area operates at a first driving frequency and the second display area operates at a second driving frequency, and the scan driving circuit sequentially drives scan lines in synchronization with the start signal, and stops, in response to the masking signal, driving of some of the scan lines corresponding to the second display area.

First claim

What is claimed is:

1. A display device comprising:
a display panel comprising a plurality of pixels respectively connected to a plurality of data lines and a plurality of scan lines;
a data driving circuit which drives the plurality of data lines;
a scan driving circuit which drives the plurality of scan lines; and
a driving controller which:
receives an image signal and a control signal,
controls the data driving circuit and the scan driving circuit according to an operation mode,
divides the display panel into a first display area and a second display area according to the operation mode, outputs a start signal indicating a start of one frame and a masking signal for indicating a start of the second display area,
sets a basic driving frequency to a normal frequency when the operation mode is a normal frequency mode, and
outputs the start signal and the masking signal so that the first display area operates at a first driving frequency and the second display area operates at a second driving frequency lower than the first driving frequency when the operation mode is a multi-frequency mode,

wherein the scan driving circuit sequentially drives the plurality of scan lines in synchronization with the start signal, and stops, in response to the masking signal, driving of scan lines corresponding to the second display area among the plurality of scan lines,
wherein the first driving frequency is higher than the basic driving frequency of the multi-frequency mode and the second driving frequency is lower than the basic driving frequency of the multi-frequency mode.

2. The display device of claim 1 , wherein a first frame has a first duration and a second frame consecutive to the first frame has a second duration during the multi-frequency mode, and the second duration is shorter than the first duration.

3. The display device of claim 2 , wherein, the first duration of the first frame during the multi-frequency mode is longer than the first duration of the first frame during the normal frequency mode.

4. The display device of claim 2 , wherein the driving controller provides image data signals corresponding to the first display area and the second display area to the data driving circuit during the first frame of the multi-frequency mode, and provides an image data signal corresponding to the first display area to the data driving circuit during the second frame of the multi-frequency mode.

5. The display device of claim 1 , wherein the driving controller provides image data signals corresponding to the first display area and the second display area to the data driving circuit in every frame during the normal frequency mode.

6. The display device of claim 1 , wherein the scan driving circuit comprises a plurality of driving stages which respectively drives corresponding scan lines among the plurality of scan lines,
wherein each of the plurality of driving stages comprises:
a driving circuit which outputs a first scan signal to a first output terminal in response to clock signals from the driving controller and a carry signal; and
a masking circuit which stops the driving circuit to output the first scan signal in response to the masking signal.

7. The display device of claim 6 , wherein a first driving stage among the plurality of driving stages receives the start signal as the carry signal.

8. The display device of claim 7 , wherein the driving circuit outputs a second scan signal to a second output terminal in response to the clock signals and the carry signal.

9. The display device of claim 8 , wherein, among the plurality of driving stages, the second scan signal output from a j-th driving stage is provided to a (j+k)-th driving stage as the carry signal, where j and k are respectively natural numbers.

10. The display device of claim 8 , wherein the masking signal comprises a first masking signal and a second masking signal,
wherein the masking circuit comprises:
a first masking circuit which electrically connects a first voltage terminal and the first output terminal in response to the first masking signal; and
a second masking circuit which electrically connects the first output terminal and the second output terminal in response to the second masking signal.

11. The display device of claim 10 , wherein the first masking circuit electrically connects the first voltage terminal and the first output terminal in response to the first masking signal during the multi-frequency mode, and
the second masking circuit electrically disconnects the first output terminal and the second output terminal in response to the second masking signal during the multi-frequency mode.

12. A display device comprising:
a display panel in which a first non-folding area, a folding area, and a second non-folding area are defined in a plan view, and which comprises a plurality of pixels respectively connected to a plurality of data lines and a plurality of scan lines;
a data driving circuit which drives the plurality of data lines;
a scan driving circuit which drives the plurality of scan lines; and
a driving controller which:
receives an image signal and a control signal,
controls the data driving circuit and the scan driving circuit according to an operation mode,
divides the display panel into a first display area and a second display area according to the operation mode, outputs a start signal indicating a start of one frame and a masking signal for indicating a start of the second display area,
sets a basic driving frequency to a normal frequency when the operation mode is a normal frequency mode,
sets the basic driving frequency to a frequency lower than the normal frequency, and
outputs the start signal and the masking signal so that the first display area operates at a first driving frequency and the second display area operates at a second driving frequency lower than the first driving frequency when the operation mode is a multi-frequency mode,

wherein the scan driving circuit sequentially drives the plurality of scan lines in synchronization with the start signal, and stops, in response to the masking signal, driving of scan lines corresponding to the second display area among the plurality of scan lines,
wherein the first driving frequency is higher than the basic driving frequency of the multi-frequency mode and the second driving frequency is lower than the basic driving frequency of the multi-frequency mode.

13. The display device of claim 12 , wherein, during the multi-frequency mode, a first frame has a first duration, a second frame consecutive to the first frame has a second duration, and the second duration is shorter than the first duration.

14. The display device of claim 13 , wherein, during the multi-frequency mode, the image signal to be provided to the first display area is a moving image signal, and the image signal to be provided to the second display area is a still image signal.

15. The display device of claim 12 , wherein the display panel is folded with reference to a folding axis extending along a predetermined direction in the folding area.

16. The display device of claim 12 , wherein the scan driving circuit comprises a plurality of driving stages respectively which drives corresponding scan lines among the plurality of scan lines,
wherein each of the plurality of driving stages comprises:
a driving circuit which outputs a first scan signal to a first output terminal and outputs a second scan signal to a second output terminal in response to clock signals from the driving controller and a carry signal; and
a masking circuit which stops the driving cir

Assignees

• Samsung Display Co Ltd

Inventors

• Seo Hae-Kwan
• Bae Woomi
• Sohn Youngha

Classifications

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G3/035 Primary

  for flexible display surfaces · CPC title

• G09G2330/02

  Details of power systems and of start or stop of display operation · CPC title

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title

• G09G2340/0435

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