Display device

Patent metadata

Field	Value
Publication number	US-11862102-B2
Application number	US-202217883869-A
Country	US
Kind code	B2
Filing date	Aug 9, 2022
Priority date	Sep 30, 2021
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

In a display device, each of pixels includes a light emitting element and a pixel circuit which is connected to the light emitting element at a first node and drives the light emitting element in response to a corresponding driving scan signal among driving scan signals during a display period. The pixel circuit is connected to a corresponding readout line among readout lines at a second node. The sensing circuit senses a potential of the first node through the corresponding readout line during a blank period, and each of frames includes the display period and the blank period. At least two driving scan signals among the driving scan signals respectively include a plurality of rewriting periods, each of which is activated during the blank period corresponding thereto, and the rewriting periods of the driving scan signals have different durations from each other.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of scan lines, a plurality of pixels, and a plurality of readout lines;
a scan driver connected to the plurality of scan lines; and
a sensing circuit connected to the plurality of readout lines,
wherein each of the plurality of pixels comprises:
a light emitting element; and
a pixel circuit connected to the light emitting element at a first node,

wherein the pixel circuit drives the light emitting element in response to a corresponding driving scan signal among a plurality of driving scan signals during a display period,
wherein the pixel circuit is connected to a corresponding readout line among the plurality of readout lines at a second node,
the sensing circuit senses a potential of the first node through the corresponding readout line during a blank period,
each of a plurality of frames comprises the display period and the blank period,
the plurality of driving scan signals respectively comprise a plurality of rewriting periods,
at least one rewriting period of at least one driving scan signal among the plurality of driving scan signals is activated during the blank period, and
the plurality of rewriting periods have different durations from each other,
wherein the sensing circuit comprises:
an initialization circuit unit which initializes a potential of the second node during an initialization period in response to an initialization control signal,

wherein a time point at which each of the rewriting periods starts precedes a time point at which the initialization period corresponding thereto starts.

2. The display device of claim 1 , wherein the plurality of scan lines comprise:
a first driving scan line spaced apart from the sensing circuit by a first distance; and
a second driving scan line spaced apart from the sensing circuit by a second distance,
wherein a second rewriting period of a second driving scan signal applied to the second driving scan line has a duration different from a duration of a first rewriting period of a first driving scan signal applied to the first driving scan line.

3. The display device of claim 2 , wherein
the second distance is longer than the first distance, and
the second rewriting period has a duration longer than a duration of the first rewriting period.

4. The display device of claim 1 , wherein the sensing circuit further comprises:
a sampling circuit unit which samples the potential of the first node during a sampling period in response to a sampling control signal.

5. The display device of claim 4 , wherein each of the plurality of rewriting periods does not overlap the sampling period corresponding thereto.

6. The display device of claim 4 ,
wherein the blank period further comprises a reference scan period preceding the sampling period corresponding thereto,
wherein the at least one driving scan signal is activated during the reference scan period corresponding thereto.

7. The display device of claim 6 , wherein each of the plurality of rewriting periods has a duration longer than a duration of the reference scan period corresponding thereto.

8. The display device of claim 4 , wherein the initialization control signal is deactivated during the sampling period.

9. The display device of claim 4 , wherein
the pixel circuit receives a corresponding sensing scan signal among a plurality of sensing scan signals,
at least one sensing scan signal among the plurality of sensing scan signals are activated in the blank period, and
the at least one sensing scan signal among the plurality of sensing scan signals are applied to same pixels as the at least one driving scan signal.

10. The display device of claim 9 , wherein the at least one sensing scan signal comprise a readout period is activated during the sampling period and a corresponding one of the plurality of rewriting periods.

11. The display device of claim 10 , wherein a plurality of readout periods of the plurality of sensing scan signals have different durations from each other.

12. The display device of claim 11 , wherein the plurality of scan lines comprise:
a first sensing scan line spaced apart from the sensing circuit by a third distance; and
a second sensing scan line spaced apart from the sensing circuit by a fourth distance,
wherein a second readout period of a second sensing scan signal applied to the second sensing scan line has a duration different from a duration of a first readout period of a first sensing scan signal applied to the first sensing scan line.

13. The display device of claim 12 , wherein
the fourth distance is longer than the third distance, and
the second readout period has a duration longer than a duration of the first readout period.

14. The display device of claim 4 ,
wherein the display panel further comprises a plurality of data lines,
wherein the pixel circuit comprises:
a first transistor connected between a first driving voltage line and the first node;
a second transistor connected between a corresponding data line among the plurality of data lines and the first transistor, wherein the second transistor receives the corresponding driving scan signal; and
a capacitor connected between the first node and the first transistor.

15. The display device of claim 14 , wherein the light emitting element comprises a light emitting diode connected between the first node and a second driving voltage line.

16. The display device of claim 14 , wherein the pixel circuit further comprises a third transistor connected between the first node and the corresponding readout line, wherein the third transistor receives a corresponding sensing scan signal among a plurality of sensing scan signals.

17. The display device of claim 14 , further comprising:
a data driver connected to the plurality of data lines,
wherein the blank period further comprises a reference scan period preceding the sampling period.

18. The display device of claim 17 , wherein the data driver
respectively applies a plurality of data signals to the plurality of data lines during the display period, and
applies a reference data signal to a corresponding data line, among the plurality of data lines, connected to a same pixel as a corresponding scan line, during the reference scan period.

19. The display device of claim 18 , wherein the data driver applies a corresponding data signal among the plurality of data signals to the corresponding data line during a corresponding one of the plurality of rewriting periods.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Jung-Taek
• Kang Byeong-Doo
• Ryu Jae Woo
• Baik Joonsuk
• Lee Sekeun

Classifications

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2310/0278

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

• G09G2310/0294

  Details of sampling or holding circuits arranged for use in a driver for data electrodes · CPC title