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

Patent metadata

Field	Value
Publication number	US-9875681-B2
Application number	US-201715414398-A
Country	US
Kind code	B2
Filing date	Jan 24, 2017
Priority date	Feb 11, 2014
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

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 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, 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 from a second frame rate for the second input image.

2. The display apparatus of claim 1 , 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.

3. The display apparatus of claim 1 , 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.

4. The display apparatus of claim 3 , 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.

5. The display apparatus of claim 3 , 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.

6. The display apparatus of claim 3 , 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.

7. The display apparatus of claim 1 , 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

• G09G2320/103

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

• G09G2330/021

  Power management, e.g. power saving · 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

• G09G2340/0435

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

• G09G2360/16

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