Display apparatus and method of driving display panel using the same

Patent metadata

Field	Value
Publication number	US-11238810-B2
Application number	US-202016923477-A
Country	US
Kind code	B2
Filing date	Jul 8, 2020
Priority date	Jul 26, 2019
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A display apparatus includes a display panel, a gate driver, a data driver and a driving controller. The display panel displays an image based on input image data. The gate driver outputs a gate signal to a gate line of the display panel. The data driver outputs a data voltage to a data line of the display panel. The driving controller controls operations of the gate driver and the data driver and drive a still image display area and a video image display area of a display area of the display panel in different driving frequencies. The driving controller includes a still image determiner which divides the input image data into a plurality of still image determining blocks, respectively determines whether the still image determining blocks represent a still image or a video image and determines a boundary between the still image display area and the video image display area.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel comprising a gate line, a data line and a pixel, wherein the display panel displays an image based on input image data;
a gate driver which outputs a gate signal to the gate line;
a data driver which outputs a data voltage to the data line; and
a driving controller which controls an operation of the gate driver and an operation of the data driver and drive a still image display area and a video image display area of a display area of the display panel in different driving frequencies,
wherein the driving controller comprises a still image determiner which divides the input image data into a plurality of still image determining blocks, respectively determines whether the still image determining blocks represent a still image or a video image and determines a boundary between the still image display area and the video image display area, and
wherein each of the still image determining blocks extends in an extending direction of the gate signal.

2. The display apparatus of claim 1 , wherein the still image determiner is which generates a flag signal representing whether the still image determining blocks represent the still image or the video image.

3. The display apparatus of claim 1 , wherein the driving controller further comprises a driving frequency determiner which divides the still image display area into a plurality of driving frequency determining blocks and respectively determines driving frequencies of the driving frequency determining blocks based on a flicker value corresponding to a grayscale value of the input image data for the driving frequency determining blocks.

4. The display apparatus of claim 3 , wherein a size of the still image determining block is different from a size of the driving frequency determining block.

5. The display apparatus of claim 4 , wherein the size of the still image determining block is less than the size of the driving frequency determining block.

6. The display apparatus of claim 3 , wherein
a size of the driving frequency determining block is fixed independently of a size of the still image display area, and
when the size of the still image display area increases according to the input image data, a number of the driving frequency determining blocks increases.

7. The display apparatus of claim 3 , wherein
a number of the driving frequency determining blocks is fixed independently of a size of the still image display area, and
when the size of the still image display area increases according to the input image data, a size of the driving frequency determining block increases.

8. The display apparatus of claim 3 , wherein the driving controller further comprises a fixed frequency determiner which determines whether an input frequency of the input image data has a normal type by counting a number of pulses of a horizontal synchronizing signal between a first pulse and a second pulse of a vertical synchronizing signal or by counting a number of pulses of a data enable signal between the first pulse and the second pulse of the vertical synchronizing signal.

9. The display apparatus of claim 8 , wherein
the fixed frequency determiner generates a frequency flag representing whether the input frequency of the input image data has the normal type or not, and
the driving frequency determiner determines a driving frequency of the display panel.

10. The display apparatus of claim 3 , wherein the driving controller further comprises a compensation frame inserter which inserts a compensation frame between a frame of a first frequency and a frame of a second frequency when the driving frequencies of the driving frequency determining blocks are changed from the first frequency to the second frequency by the driving frequency determiner.

11. The display apparatus of claim 3 , wherein
the display panel comprises a plurality of segments, and
the driving controller determines a driving frequency of the display panel based on driving frequencies determined based on a flicker value corresponding to a grayscale value of the input image data for the segments.

12. The display apparatus of claim 11 , wherein
each of the driving frequency determining blocks includes a plurality of the segments, and
the driving frequency determiner determines the driving frequency of each of the driving frequency determining blocks based on driving frequencies determined based on the flicker value corresponding to the grayscale value of the input image data for the segments therein.

13. A method of driving a display panel, the method comprising:
dividing input image data into a plurality of still image determining blocks;
respectively determining whether the still image determining blocks represent a still image or a video image;
determining a boundary between a still image display area and a video image display area of a display area of the display panel;
determining a driving frequency of the still image display area;
determining a driving frequency of the video image display area;
outputting a gate signal to a gate line of the display panel based on the driving frequency of the still image display area and the driving frequency of the video image display area; and
outputting a data voltage to a data line of the display panel based on the driving frequency of the still image display area and the driving frequency of the video image display area,
wherein the still image display area and the video image display area of the display area are driven in different driving frequencies from each other, and
wherein each of the still image determining blocks extends in an extending direction of the gate signal.

14. The method of claim 13 , further comprising:
generating a flag signal representing whether the still image determining blocks represent the still image or the video image.

15. The method of claim 13 , further comprising:
dividing the still image display area into a plurality of driving frequency determining blocks; and
respectively determining driving frequencies of the driving frequency determining blocks based on a flicker value corresponding to a grayscale value of the input image data for the driving frequency determining blocks.

16. The method claim 15 , wherein a size of the still image determining block is less than a size of the driving frequency determining block.

17. The method of claim 15 , further comprising:
inserting a compensation frame between a frame of a first frequency and a frame of a second frequency when the driving frequencies of the driving frequency determining blocks are changed from the first frequency to the second frequency.

18. The method of claim 15 , wherein
each of the driving frequency determining blocks includes a plurality of segments, and
the driving frequency of each of the driving frequency determining blocks is determined based on driving frequencies for determined based on the flicker value corresponding to the grayscale value of the input image data for the segments therein.

19. The method of claim 13 , further comprising:
determining whether an input frequency of the input image data is a normal type by counting a number of pulses of a horizontal synchronizing signal between a first pulse and a second pulse of a vertical synchronizing signal or by counting a number of pulses of a data enable signal between the first pulse and the second pulse of the vertical synchronizing signal.

20. The method of claim 19 , further comprising:
generating a frequency flag

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Hongsoo
• Kwon Sangan
• Roh Jinyoung
• Park Sehyuk
• Lee Sukhun
• Lee Hyojin

Classifications

• G09G2310/04

  Partial updating of the display screen · CPC title

• G09G2320/0613

  The adjustment depending on the type of the information to be displayed · CPC title

• G09G2340/0435

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

• G09G2320/0247

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

• G09G2330/021

  Power management, e.g. power saving · CPC title