Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-11869445-B2
Application number	US-202217864762-A
Country	US
Kind code	B2
Filing date	Jul 14, 2022
Priority date	Sep 7, 2021
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A display device includes a display panel, a data driver, a scan driver, and a driving controller. The display panel includes a first display area and a second display area, which operate at different frequencies from each other in a multi-frequency mode. The driving controller controls the data driver and the scan driver. The driving controller generates boundary compensation data by compensating for boundary image signals, which are input to correspond to a boundary area of the first display area in the multi-frequency mode and drives the data driver based on a compensation image signal including the boundary compensation data.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of pixels, which are connected to a plurality of data lines and a plurality of scan lines, wherein a first display area and a second display area, which operate at different frequencies from each other in a multi-frequency mode, are defined in the display panel;
a data driver which drives the plurality of data lines;
a scan driver which drives the plurality of scan lines; and
a driving controller which controls the data driver and the scan driver,
wherein
wherein the first display area includes a boundary area, which adjacent to the second display area, and a non-boundary area, which is not adjacent to the second display area,
the scan driver includes a first scan circuit outputting a plurality of first scan signals and a second scan circuit outputting a plurality of second scan signals,
the driving controller generates boundary compensation data by compensating for boundary image signals, which are input to correspond to a boundary area of the first display area in the multi-frequency mode, wherein the boundary area is a portion of the first display area adjacent to the second display area,
the driving controller drives the data driver based on a compensation image signal including the boundary compensation data, and
the second scan circuit includes:
a plurality of transmission circuits arranged to correspond to the non-boundary area, wherein the plurality of transmission circuits outputs a part of the plurality of second scan signals in the multi-frequency mode; and
a plurality of masking circuits arranged to correspond to the boundary area and the second display area, wherein the plurality of masking circuits masks a remaining part of the plurality of second scan signals in the multi-frequency mode.

2. The display device of claim 1 ,
wherein the boundary area is positioned between the non-boundary area and the second display area.

3. The display device of claim 2 , wherein
the first scan circuit is a compensation scan circuit including a plurality of stages, which outputs a plurality of compensation scan signals, respectively; and
the second scan circuit is an initialization scan circuit electrically connected to the compensation scan circuit, wherein the initialization scan circuit outputs a plurality of initialization scan signals.

4. The display device of claim 3 , wherein
the plurality of transmission circuits outputs a part of the plurality of initialization scan signals in the multi-frequency mode as the part of the plurality of second scan signals; and
the plurality of masking circuits masks a remaining part of the plurality of initialization scan signals in the multi-frequency mode as the remaining part of the plurality of second scan signals.

5. The display device of claim 3 ,
wherein a pixel of the plurality of pixels is connected to a k-th compensation scan line and a k-th initialization scan line among the plurality of scan lines,
wherein the k-th initialization scan line receives a (k−p)-th initialization scan signal among the plurality of initialization scan signals, and
wherein p is a natural number of 1 or greater.

6. The display device of claim 5 , wherein
the k-th compensation scan line receives a k-th compensation scan signal, and
wherein an activation period of the k-th compensation scan signal does not overlap an activation period of the (k−p)-th initialization scan signal.

7. The display device of claim 1 , wherein the driving controller includes:
a receiver which receives the boundary image signals through q channels in synchronization with a data clock signal; and
a compensator which generates the boundary compensation data by reflecting a preset compensation value to the boundary image signals in units of one cycle of the data clock signal, and
wherein q is a natural number of 1 or greater.

8. The display device of claim 7 , wherein the compensator receives a first compensation control signal which determines an input time point and an end time point of the boundary image signals corresponding to the boundary area.

9. The display device of claim 7 ,
wherein the boundary image signals include q data blocks respectively entered through the q channels, and
wherein the compensator receives a second compensation control signal which determines the number of data blocks to be compensated from among the q data blocks, and reflects the preset compensation value to a data block selected from the q data blocks in response to the second compensation control signal.

10. The display device of claim 7 ,
wherein the receiver receives the boundary image signals in response to a data enable signal and a horizontal synchronization signal, and
wherein the compensator outputs the compensation image signal in response to an output enable signal and an output synchronization signal.

11. The display device of claim 10 ,
wherein the output enable signal is a signal obtained by delaying the data enable signal by the one cycle of the data clock signal, and
wherein the output synchronization signal is a signal obtained by delaying the horizontal synchronization signal by the one cycle of the data clock signal.

12. The display device of claim 1 , wherein the driving controller includes:
a receiver which receives the boundary image signals through q channels in synchronization with a data clock signal;
an accumulation table which accumulates a result of counting the boundary image signals based on preset reference grayscale ranges;
a compensation determination unit which determines a compensation value for each reference grayscale range based on the accumulated result value; and
a compensator which generates the boundary compensation data by compensating for the boundary image signals based on the determined compensation value, and
wherein q is a natural number of 1 or greater.

13. The display device of claim 12 , wherein the accumulation table includes:
a first accumulation table which accumulates a result of counting a first boundary image signal corresponding to a first color based on the reference grayscale ranges;
a second accumulation table which accumulates a result of counting a second boundary image signal corresponding to a second color based on the reference grayscale ranges; and
a third accumulation table which accumulates a result of counting a third boundary image signal corresponding to a third color based on the reference grayscale ranges.

14. The display device of claim 13 , wherein
the compensation determination unit receives a first result value from the first accumulation table and determines a first compensation value based on the first result value,
the compensation determination unit receives a second result value from the second accumulation table and determines a second compensation value based on the second result value, and
the compensation determination unit receives a third result value from the third accumulation table and determines a third compensation value based on the third result value.

15. The display device of claim 13 ,
wherein each of the first to third boundary image signals includes q data blocks respectively entered through the q channels,
wherein the compensation determination unit determines first compensation resolution for determining the number of data blocks to be compensated from among the q data blocks based on the first result value,
the compensation determination unit determines second compensation resolution for determining the number of data blocks to be compensated from among the q data blocks based on

Assignees

• Samsung Display Co Ltd

Inventors

• Yoon Changnoh
• Kwon Sangan
• Kim Soon-Dong
• Kim Taehoon
• Yun Eun Sil

Classifications

• G09G3/3275 Primary

  Details of drivers for data electrodes · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G2310/0278

  Details of driving circuits arranged to drive both scan and data electrodes · CPC title

• G09G5/003 Primary

  Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto (specific for a CRT G09G1/165; for a flat panel G09G3/2092) · CPC title

• G09G2310/0232

  Special driving of display border areas · CPC title