Method of driving display panel and display apparatus for performing the same

Patent metadata

Field	Value
Publication number	US-9583036-B2
Application number	US-201414495830-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Feb 11, 2014
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A method of driving a display panel includes dividing an input image into a plurality of segments; generating flicker levels of respective ones of the segments; determining a frame rate of the display panel based on the flicker levels of the segments; and outputting a data voltage to the display panel at the frame rate.

First claim

What is claimed is:

1. A method of driving a display panel, the method comprising:
dividing an input image into a plurality of segments;
generating flicker levels of respective ones of the segments according to flicker levels of each of a plurality of pixels at each of the segments, the flicker levels of each of the plurality of pixels being determined according to a luminance of a corresponding pixel at a corresponding frame rate;
determining a frame rate of the display panel based on the flicker levels of the segments; and
outputting a data voltage to the display panel at the frame rate,
wherein a first input image comprises a first grayscale representing a first luminance and a second grayscale representing a second luminance greater than the first luminance, the first input image having a first ratio between the first grayscale and the second grayscale, the second grayscale being concentrated at a central portion of the display panel in the first input image,
a second input image comprises the first grayscale and the second grayscale, the second input image having the first ratio between the first grayscale and the second grayscale, the second grayscale being distributed throughout the display panel in the second input image, and
a first frame rate for the first input image is different form a second frame rate for the second input image.

2. The method of claim 1 , further comprising determining whether the input image is a static image or a video image,
wherein when the input image is the static image, the frame rate of the display panel is determined based on the flicker levels of the segments.

3. The method of claim 1 , wherein the generating the flicker levels of the segments comprises:
converting luminance of a plurality of pixels at each of the segments into flicker levels of respective ones of the pixels; and
calculating the flicker levels of the pixels in the segment.

4. The method of claim 3 , wherein the input image comprises a red grayscale, a green grayscale and a blue grayscale, and
the generating the flicker levels of the segments further comprises extracting the luminance of the plurality of pixels at each of the segments based on the red grayscale, the green grayscale and the blue grayscale.

5. The method of claim 3 , wherein the calculating the flicker levels of the pixels in the segments comprises adding up the flicker levels of the respective ones of the pixels.

6. The method of claim 3 , wherein the calculating the flicker levels of the pixels in the segments comprises:
setting weights of the respective ones of the pixels according to positions of the respective ones of the pixels; and
calculating a weighted sum of flicker levels of the pixels.

7. The method of claim 6 , wherein ones of the pixels at an outside portion of the display panel have a relatively large weight.

8. The method of claim 1 , wherein the segments have a rectangular shape having a longer side extending in a horizontal direction.

9. The method of claim 1 , wherein the determining the frame rate of the display panel based on the flicker levels of the segments comprises comparing a maximum flicker level of the segments to a threshold.

10. The method of claim 1 , wherein the determining the frame rate of the display panel based on the flicker levels of the segments comprises comparing an average of flicker levels of segments having relatively high flicker levels to a threshold.

11. The method of claim 1 , wherein the first frame rate is greater than the second frame rate.

12. A display apparatus comprising:
a display panel configured to display an image;
a low frequency driving part configured to divide an input image into a plurality of segments, to generate flicker levels of respective ones of the segments according to flicker levels of each of a plurality of pixels at each of the segments, the flicker levels of each of the plurality of pixels being determined according to a luminance of a corresponding pixel at a corresponding frame rate, and to determine a frame rate of the display panel based on the flicker levels of the segments; and
a data driver configured to output a data voltage to the display panel at the frame rate,
wherein a first input image comprises a first grayscale representing a first luminance and a second grayscale representing a second luminance greater than the first luminance, the first input image having a first ratio between the first grayscale and the second grayscale, the second grayscale being concentrated at a central portion of the display panel in the first input image,
a second input image comprises the first grayscale and the second grayscale, the second input image having the first ratio between the first grayscale and the second grayscale, the second grayscale being distributed throughout the display panel in the second input image, and
a first frame rate for the first input image is different form a second frame rate for the second input image.

13. The display apparatus of claim 12 , wherein the low frequency driving part comprises a static image determining part configured to determine whether the input image is a static image or a video image, and
when the input image is the static image, the low frequency driving part determines the frame rate of the display panel based on the flicker levels of the segments.

14. The display apparatus of claim 12 , wherein the low frequency driving part is configured to convert luminance of a plurality of pixels at each of the segments into flicker levels of respective ones of the pixels, and to calculate the flicker levels of the pixels in the segments to generate the flicker levels of the segments.

15. The display apparatus of claim 14 , wherein the input image comprises a red grayscale, a green grayscale and a blue grayscale, and
the low frequency driving part is configured to extract the luminance of the plurality of pixels at each of the segments based on the red grayscale, the green grayscale and the blue grayscale.

16. The display apparatus of claim 14 , wherein the low frequency driving part is configured to add up the flicker levels of the respective ones of the pixels to generate the flicker levels of the segments.

17. The display apparatus of claim 14 , wherein the low frequency driving part is configured to set weights of the respective ones of the pixels according to positions of the respective ones of the pixels, and to calculate a weighted sum of flicker levels of the pixels to generate the flicker levels of the segments.

18. The display apparatus of claim 12 , wherein the first frame rate is greater than the second frame rate.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Kyoung-Won
• Park Su-Hyeong
• You Bong-Hyun
• Jung Ho-Yong
• Lee Eun-Ho
• Lee Hyun-Dae

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2340/0435

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

• G09G5/18

  Timing circuits for raster scan displays (specially adapted for television H04N {; synchronisation between the display unit and other display units, videodisc player G09G5/12}) · CPC title

• G09G2320/103

  Detection of image changes, e.g. determination of an index representative of the image change · CPC title