Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-12451085-B2
Application number	US-202418603409-A
Country	US
Kind code	B2
Filing date	Mar 13, 2024
Priority date	May 12, 2023
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A display device includes a display panel including pixels, a data driver which applies a dithering data voltage to the display panel, and a driving controller which determines whether to perform a dithering operation of applying the dithering data voltage to the display panel based on input image data. The display device alternately changes the dithering data voltage in units of one frame when the dithering operation is performed at a first dithering frequency or a third dithering frequency, and alternately changes the dithering data voltage in units of N frames when the dithering operation is performed at a second dithering frequency.

First claim

What is claimed is:

1. A display device comprising:
a display panel including pixels;
a data driver which applies a dithering data voltage to the display panel; and
a driving controller which determines whether to perform a dithering operation of applying the dithering data voltage to the display panel based on input image data,
wherein, when the dithering operation is performed at a first dithering frequency or a third dithering frequency, which is smaller than the first dithering frequency, the dithering data voltage is alternately applied to the display panel in units of one frame, and
wherein, when the dithering operation is performed at a second dithering frequency, which is less than the first dithering frequency and greater than the third dithering frequency, the dithering data voltage is alternately applied to the display panel in units of N frames, wherein N is a natural number of 2 or greater,
wherein, when the second dithering frequency decreases, a value of N decreases, and
wherein, when the dithering data voltage is alternately applied to the display panel in units of N frames, a same dithering data voltage is applied to the display panel during N frames.

2. The display device of claim 1 , wherein a flicker value of the first dithering frequency and a flicker value of the third dithering frequency are greater than a flicker value of the second dithering frequency.

3. The display device of claim 2 , wherein, when N increases, the flicker value of the second dithering frequency decreases.

4. The display device of claim 1 , wherein, when the dithering operation is performed at the second dithering frequency, the dithering data voltage is a first dithering data voltage in first to N-th frames and is a second dithering data voltage which is different from the first dithering data voltage in (N+1)-th to 2N-th frames.

5. The display device of claim 4 , wherein a target grayscale is determined based on the first dithering data voltage and the second dithering data voltage.

6. The display device of claim 5 , wherein a dithering data voltage corresponding to the target grayscale is a voltage between the first dithering data voltage and the second dithering data voltage.

7. The display device of claim 4 , wherein the first dithering data voltage is greater than the second dithering data voltage.

8. The display device of claim 6 , wherein the second dithering data voltage is greater than the first dithering data voltage.

9. The display device of claim 1 , wherein, when a grayscale of the input image data changes, the first dithering frequency, the second dithering frequency and the third dithering frequency are changed.

10. The display device of claim 9 , wherein, when the grayscale of the input image data increases, the second dithering frequency decreases.

11. The display device of claim 9 , wherein, when the grayscale of the input image data increases, a difference between a maximum frequency of the second dithering frequency and a minimum frequency of the second dithering frequency decreases.

12. A method of driving a display device, the method comprising:
determining whether to perform a dithering operation of applying a dithering data voltage to a display panel based on input image data;
alternately applying the dithering data voltage to the display panel in units of one frame when the dithering operation is performed at a first dithering frequency or a third dithering frequency, which is less than the first dithering frequency; and
alternately applying the dithering data voltage to the display panel in units of N frames when the dithering operation is performed at a second dithering frequency, which is less than the first dithering frequency and greater than the third dithering frequency, herein N is a natural number of 2 or greater,
wherein, when the second dithering frequency decreases, a value of N decreases, and
wherein, when the dithering data voltage is alternately applied to the display panel in units of N frames, a same dithering data voltage is applied to the display panel during N frames.

13. The method of claim 12 , wherein a flicker value of the first dithering frequency and a flicker value of the third dithering frequency are greater than a flicker value of the second dithering frequency.

14. The method of claim 13 , wherein, when a value of N increases, the flicker value of the second dithering frequency decreases.

15. The method of claim 12 , wherein, when the dithering operation is performed at the second dithering frequency, the dithering data voltage is a first dithering data voltage in first to N-th frames and is a second dithering data voltage which is different from the first dithering data voltage in (N+1)-th to 2N-th frames.

16. The method of claim 15 , wherein a target grayscale is determined based on the first dithering data voltage and the second dithering data voltage.

17. The method of claim 16 , wherein a dithering data voltage corresponding to the target grayscale is a voltage between the first dithering data voltage and the second dithering data voltage.

18. The method of claim 15 , wherein the first dithering data voltage is greater than the second dithering data voltage.

19. The method of claim 15 , wherein the second dithering data voltage is greater than the first dithering data voltage.

Assignees

• Samsung Display Co Ltd

Inventors

• Song Hyunseop
• Kang Sun-Koo
• Kim Youngbin
• Shin Byungchul
• CHO Eunjeong

Classifications

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2310/0275

  Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G09G2340/0435

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