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

Patent metadata

Field	Value
Publication number	US-9548016-B2
Application number	US-201514609553-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Jul 22, 2014
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A method of driving a display panel includes determining whether an input data signal represents a video image or a static image, determining whether the input data signal has a color difference generating pattern and outputting an output data signal. The output data signal has a first frequency if the input data signal represents a video image. The output data signal has the first frequency if the input data signal represents a static image and the input data signal includes the color difference generating pattern. The output data signal has a second frequency lower than the first frequency if the input data signal represents a static image and the input data signal does not include the color difference generating pattern.

First claim

What is claimed is:

1. A method of driving a display panel, the method comprising:
determining whether an input data signal represents a video image or a static image;
determining whether the input data signal has a color difference generating pattern, the color difference generating pattern generating a color difference if polarities of associated pixels are inverted; and
outputting an output data signal,
wherein the output data signal has a first frequency if the input data signal represents a video image,
wherein the output data signal has the first frequency if the input data signal represents a static image and the input data signal includes the color difference generating pattern, and
wherein the output data signal has a second frequency lower than the first frequency if the input data signal represents a static image and the input data signal does not include the color difference generating pattern.

2. The method of claim 1 , wherein the outputting the output data signal comprises:
generating an intermediate data signal, the intermediate data signal having the first frequency if the input data signal represents a video image, and the intermediate data signal having the second frequency if the input data signal represents a static image; and
selecting one of the input data signal and the intermediate data signal according to a determination whether the input data signal includes the color difference generating pattern.

3. The method of claim 2 , wherein the determination whether the input data signal includes the color difference generating pattern comprises:
dividing the input data signal into a plurality of segments; and
detecting a segment having the color difference generating pattern among the plurality of the segments.

4. The method of claim 3 , wherein the detecting the segment having the color difference generating pattern comprises:
dividing the segment into a plurality of rows; and
determining the color difference generating pattern by comparing adjacent rows in the segment.

5. The method of claim 4 , wherein the detecting the segment having the color difference generating pattern comprises:
if a first row of the segment includes a first color difference generating pattern, storing a number of the segment and a type of the first color difference generating pattern of the first row.

6. The method of claim 5 , wherein the detecting the segment having the color difference generating pattern comprises:
if a second row of the segment includes a second color difference generating pattern and the type of the second color difference generating pattern of the second row is different from the type of the first color difference generating pattern of the first row, storing the number of the segment and the type of the second color difference generating pattern of the second row.

7. The method of claim 1 , wherein the display panel includes a first pixel, a second pixel adjacent to the first pixel in a first direction, a third pixel adjacent to the first pixel in a second direction different from the first direction and a fourth pixel adjacent to the second pixel in the second direction, and
the first pixel includes a first red subpixel, a first green subpixel, and a first blue subpixel, which are sequentially disposed in the first direction, the second pixel includes a second red subpixel, a second green subpixel, and a second blue subpixel, which are sequentially disposed in the first direction, the third pixel includes a third red subpixel, a third green subpixel, and a third blue subpixel, which are sequentially disposed in the first direction, and the fourth pixel includes a fourth red subpixel, a fourth green subpixel and a fourth blue subpixel, which are sequentially disposed in the first direction.

8. The method of claim 7 , wherein all subpixels of the second and third pixels have substantially low grayscales, the green subpixels in the first and fourth pixels commonly have substantially high grayscales, and the red subpixels and/or the blue subpixels in the first and fourth pixels commonly have substantially high grayscales, and
polarities of data voltages are inverted in every subpixel in the first direction and the second direction.

9. A method of driving a display panel, the method comprising:
determining whether an input data signal represents a video image or a static image;
determining whether the input data signal has a color difference generating pattern, the color difference generating pattern generating a color difference if polarities of associated pixels are inverted;
outputting an output data signal; and
determining an inversion driving method of the display panel according to the determination whether the input data signal represents a video image or a static image and the determination whether the input data signal includes the color difference generating pattern,
wherein the output data signal has a first frequency if the input data signal represents a video image, and
wherein the output data signal has a second frequency lower than the first frequency if the input data signal represents a static image.

10. The method of claim 9 , wherein the display panel is driven in a dot inversion method if the input data signal represents a video image,
the display panel is driven in the dot inversion method if the input data signal represents a static image and the input data signal does not include the color difference generating pattern, and
the display panel is driven in a column inversion method if the input data signal represents a static image and the input data signal includes the color difference generating pattern.

11. A display apparatus comprising:
a display panel configured to display an image;
a timing controller configured to determine whether an input data signal represents a video image or a static image, to determine whether the input data signal includes a color difference generating pattern, the color difference generating pattern generating a color difference if polarities of associated pixels are inverted, to output an output data signal; and
a data driver configured to generate a data voltage based on the output data signal and to output the data voltage to the display panel,
wherein the output data signal has a first frequency if the input data signal represents a video image,
wherein the output data signal has the first frequency if the input data signal represents a static image and the input data signal includes the color difference generating pattern, and
wherein the output data signal has a second frequency lower than the first frequency if the input data signal represents a static image and the input data signal does not include the color difference generating pattern.

12. The display apparatus of claim 11 , wherein the timing controller comprises:
a low frequency driving part configured to generate an intermediate data signal, the intermediate data signal having the first frequency if the input data signal represents a video image, and the intermediate data signal having the second frequency if the input data signal represents a static image;
a color difference determining part configured to determine whether the input data signal includes the color difference generating pattern and to generate a selection signal according to the determination whether the input data signal includes the color difference generating pattern; and
a selecting part configured to select one of the input data signal and the intermediate data signal based on the selection signal.

13. The display apparatus of claim 12 , wherein the selecting part comprises a multiplexer including a first inpu

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Hyun-Dae
• Lee Kyoung-Won
• Lee Eun-Ho

Classifications

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G2320/103

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

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2310/0297

  Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns · CPC title