Multi -frequency mode display device

Patent metadata

Field	Value
Publication number	US-12288523-B2
Application number	US-202318368946-A
Country	US
Kind code	B2
Filing date	Sep 15, 2023
Priority date	Oct 5, 2021
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

Disclosed is a display device including a display panel including a plurality of pixels and a voltage generator providing an anode initialization voltage to the pixels. The display panel is divided into a first display area operating at a first operating frequency and a second display area operating at a second operating frequency. While pixels, which correspond to the first display area, from among the plurality of pixels are driven, the anode initialization voltage has a first voltage level. While pixels in the second display area from among the plurality of pixels are driven, the anode initialization voltage has a second voltage level different from the first voltage level.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of pixels and divided into a first display area which operates at a first operating frequency and a second display area which operates at a second operating frequency; and
a voltage generator, which provides an anode initialization voltage to the plurality of pixels,
wherein, in an operation mode, the anode initialization voltage has a first voltage level when pixels corresponding to the first display area among the plurality of pixels are driven, and
wherein, in the operation mode, the anode initialization voltage has a second voltage level different from the first voltage level when pixels corresponding to the second display area among the plurality of pixels are driven.

2. The display device of claim 1 , further comprising:
a driving controller, which:
determines the operation mode; and
when the operation mode is a multi-frequency mode, outputs a voltage control signal for changing a voltage level of the anode initialization voltage at which the second display area is driven,
wherein the voltage generator outputs the anode initialization voltage in response to the voltage control signal.

3. The display device of claim 1 , wherein the second operating frequency is lower than the first operating frequency, and
wherein the second voltage level of the anode initialization voltage is higher than the first voltage level.

4. The display device of claim 1 , wherein, when a part of the first display area adjacent to the second display area and a part of the second display area adjacent to the first display area are driven, the anode initialization voltage is changed step by step from the first voltage level to the second voltage level.

5. The display device of claim 1 , wherein each of the plurality of pixels includes:
a light emitting element including an anode and a cathode; and
a transistor connected between the anode of the light emitting element and a voltage line,
wherein the anode initialization voltage is provided from the voltage line to the anode of the light emitting element through the transistor.

6. The display device of claim 1 , further comprising:
a first voltage line electrically connected to the pixels corresponding to the first display area; and
a second voltage line electrically connected to the pixels corresponding to the second display area,
wherein the anode initialization voltage includes a first anode initialization voltage and a second anode initialization voltage, and
the voltage generator provides the first anode initialization voltage to the first voltage line and provides the second anode initialization voltage to the second voltage line.

7. The display device of claim 6 , wherein, while the pixels of the second display area is driven when the second operating frequency is lower than the first operating frequency, a voltage level of the second anode initialization voltage is lower than a voltage level of the first anode initialization voltage.

8. The display device of claim 6 , wherein, when the second operating frequency is identical to the first operating frequency, the first anode initialization voltage and the second anode initialization voltage are at a same voltage level.

9. The display device of claim 6 , wherein each of the pixels corresponding to the first display area includes:
a light emitting element including an anode and a cathode; and
a transistor connected between the anode of the light emitting element and the first voltage line.

10. The display device of claim 6 , wherein each of the pixels corresponding to the second display area includes:
a light emitting element including an anode and a cathode; and
a transistor connected between the anode of the light emitting element and the second voltage line.

11. The display device of claim 1 ,
wherein the anode initialization voltage has the first voltage level during a first frame in a multi-frequency mode,
wherein the anode initialization voltage has the first voltage level when the pixels corresponding to the first display area are driven during a second frame different from the first frame of the multi-frequency mode, and
wherein the anode initialization voltage has the second voltage level when the pixels corresponding to the second display area are driven during the second frame of the multi-frequency mode.

12. A display device comprising:
a display panel divided into a first display area and a second display area and including a first pixel positioned in the first display area and a second pixel positioned in the second display area;
a voltage generator, which provides a first anode initialization voltage to the first pixel in response to a voltage control signal and provides a second anode initialization voltage to the second pixel in response to the voltage control signal; and
a driving controller, which:
determines an operation mode;
drives the first pixel at a first operating frequency and drives the second pixel at a second operating frequency; and
outputs the voltage control signal,
wherein, when the operation mode is a multi-frequency mode, the first anode initialization voltage has a first voltage level and the second anode initialization voltage has a second voltage level different from the first voltage level.

13. The display device of claim 12 , wherein, during a first frame of the multi-frequency mode, the driving controller provides a valid data signal to the first pixel and the second pixel, and
wherein, during a second frame of the multi-frequency mode, the driving controller provides the valid data signal to the first pixel and provides an invalid data signal to the second pixel.

14. The display device of claim 12 , wherein in the multi-frequency mode, the second operating frequency is lower than the first operating frequency, and
wherein the second voltage level of the second anode initialization voltage is lower than the first voltage level of the first anode initialization voltage.

15. The display device of claim 12 , wherein the driving controller outputs the voltage control signal in synchronization with a vertical synchronization signal,
wherein in the multi-frequency mode, the second anode initialization voltage is changed from the first voltage level to the second voltage level during a blank section of the vertical synchronization signal.

16. The display device of claim 12 , wherein, when the operation mode is a low frequency mode, the driving controller drives each of the first pixel and the second pixel at a third operating frequency lower than the first operating frequency,
wherein the driving controller provides a valid data signal to the first pixel and the second pixel during a first frame in the low frequency mode, provides an invalid data signal to the first pixel and the second pixel during a second frame in the low frequency mode,
wherein, during the first frame in the low frequency mode, each of the first anode initialization voltage and the second anode initialization voltage has the first voltage level, and
wherein, during the second frame in the low frequency mode, each of the first anode initialization voltage and the second anode initialization voltage has the second voltage level.

17. The display device of claim 12 , wherein, when the operation mode is a single frequency mode, the first operating frequency is identical to the second operating frequency,
wherein the driving controller provides a valid data signal to the first pixel and the second pixel during each frame in the single frequency mode, and

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Soon-Dong
• Kim Taehoon
• Yang Jin-Wook
• Yun Eun Sil
• Yoon Changnoh

Classifications

• G09G2330/021

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• G09G2310/0278

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• G09G2330/028

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• G09G2340/0435

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