Display device and method of operating the same

Patent metadata

Field	Value
Publication number	US-11640793-B2
Application number	US-202117400589-A
Country	US
Kind code	B2
Filing date	Aug 12, 2021
Priority date	Nov 12, 2020
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

A display device may include a display panel including a plurality of pixels, a data driver which applies data signals to the display panel, a scan driver including scan stages, which sequentially applies scan signals to the display panel, an emission driver including an emission stage which sequentially applies emission signals to the display panel, and a power supply voltage generator which generates a power supply voltage including high voltages and low voltages, and provides the high voltages having different voltage levels from each other or the low voltages having different voltage levels from each other to at least one selected from the scan stages and the emission stage. The power supply voltage generator generates a first high voltage, a first low voltage, a second high voltage lower than the first high voltage, and a second low voltage higher than the first low voltage based on an input voltage.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of pixels;
a data driver which applies data signals to the display panel;
a scan driver including a plurality of scan stages, which sequentially applies scan signals to the display panel;
an emission driver including an emission stage which sequentially applies emission signals to the display panel;
a controller which controls the scan driver, the emission driver, and the data driver; and
a power supply voltage generator which generates a power supply voltage including high voltages and low voltages, and provides the high voltages having different voltage levels from each other or the low voltages having different voltage levels from each other to at least one selected from the scan stages and the emission stage, wherein
the power supply voltage generator generates a first high voltage, a first low voltage lower than the first high voltage, a second high voltage lower than the first high voltage and higher than the first low voltage, and a second low voltage higher than the first low voltage based on an input voltage,
wherein the second high voltage and the second low voltage are scaled from the first high voltage and the first low voltage, respectively.

2. The display device of claim 1 , wherein the power supply voltage generator includes:
a voltage generating block which generates the first high voltage and the first low voltage based on the input voltage; and
a voltage scaling block which scales the first high voltage to the second high voltage, and scales the first low voltage to the second low voltage.

3. The display device of claim 2 , wherein the scan stages include a writing scan stage, a compensation scan stage, an initialization scan stage, and a bypass scan stage.

4. The display device of claim 3 , wherein a scan start signal of the at least one selected from the scan stages and a scan clock signal of at least one selected from the scan stages are toggled between the second high voltage and the second low voltage.

5. The display device of claim 4 , wherein the voltage scaling block determines magnitudes of the second high voltage and the second low voltage based on previously stored data.

6. The display device of claim 4 , wherein the power supply voltage generator provides the second high voltage and the second low voltage to the compensation scan stage and the initialization scan stage.

7. The display device of claim 6 , wherein scan start signals of the compensation scan stage and the initialization scan stage, and scan clock signals of the compensation scan stage and the initialization scan stage are toggled between the second high voltage and the second low voltage.

8. The display device of claim 6 , wherein the power supply voltage generator provides the first high voltage and the second low voltage to the writing scan stage.

9. The display device of claim 8 , wherein a scan start signal of the writing scan stage and a scan clock signal of the writing scan stage are toggled between the first high voltage and the second low voltage.

10. The display device of claim 6 , wherein an emission start signal of the emission stage and an emission clock signal of the emission stage are toggled between the second high voltage and the second low voltage.

11. The display device of claim 6 , wherein a scan start signal of the bypass scan stage and a scan clock signal of the bypass scan stage are toggled between the second high voltage and the second low voltage.

12. A method of operating a display device, the method comprising:
generating a first high voltage and a first low voltage based on an input voltage;
scaling the first high voltage to a second high voltage lower than the first high voltage, and scaling the first low voltage lower than the first high voltage and second high voltage to a second low voltage higher than the first low voltage; and
providing high voltages having different voltage levels from each other or low voltages having different voltage levels from each other to at least one selected from scan stages and an emission stage of the display device.

13. The method of claim 12 , wherein the scan stages include a writing scan stage, a compensation scan stage, an initialization scan stage, and a bypass scan stage.

14. The method of claim 13 , wherein the scaling the first high voltage to the second high voltage and the scaling the first low voltage to the second low voltage includes determining magnitudes of the second high voltage and the second low voltage based on previously stored data.

15. The method of claim 13 , wherein the providing the high voltages having the different voltage levels from each other or the low voltages having the different voltage levels from each other includes providing the second high voltage and the second low voltage to the compensation scan stage and the initialization scan stage.

16. The method of claim 15 , wherein scan start signals of the compensation scan stage and the initialization scan stage, and scan clock signals of the compensation scan stage and the initialization scan stage are toggled between the second high voltage and the second low voltage.

17. The method of claim 15 , wherein the providing the high voltages having the different voltage levels from each other or the low voltages having the different voltage levels from each other includes providing the first high voltage and the second low voltage to the writing scan stage.

18. The method of claim 17 , wherein a scan start signal of the writing scan stage and a scan clock signal of the writing scan stage are toggled between the first high voltage and the second low voltage.

19. The method of claim 15 , wherein an emission start signal of the emission stage and an emission clock signal of the emission stage are toggled between the second high voltage and the second low voltage.

20. The method of claim 15 , wherein a scan start signal of the bypass scan stage and a scan clock signal of the bypass scan stage are toggled between the second high voltage and the second low voltage.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Sungjin
• Park Jongwon
• Seo Myeonghee
• Yun Huigyeong
• Lee Seung-Kyu
• Hwang Younguk

Classifications

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2330/02

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

• G09G2310/0213

  controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title