Method of compensating image to be displayed on display panel

Patent metadata

Field	Value
Publication number	US-9972281-B2
Application number	US-201414321623-A
Country	US
Kind code	B2
Filing date	Jul 1, 2014
Priority date	Nov 14, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A method of compensating an image to be display on a display panel is disclosed. In one aspect, the method includes receiving a first input image and adjusting a contrast sensitivity of the first input image. The method also includes calculating a first derivative of luminance of a pixel included in the adjusted image, calculating a second derivative of the luminance of the pixel, and accumulating the first and second derivatives. The method further includes determining a burn-in causing boundary based at least in part on the accumulated first and second derivatives, receiving a second input image, and comparing the burn-in causing boundary to a boundary of the second input image to determine whether to apply burn-in compensation. The method finally includes compensating a portion of the second input image corresponding to the burn-in causing boundary based at least in part on an unsharpening filter.

First claim

What is claimed is:

1. A method of compensating an image to be displayed on a display panel including a plurality of pixels, the method comprising:
receiving a first input image;
adjusting a contrast sensitivity of the first input image by emphasizing a boundary of the first input image, the adjusting comprising:
converting the first input image into a frequency domain,
multiplying the converted first input image with a contrast sensitivity function, wherein the contrast sensitivity function is configured to adjust a perceived difference in luminance of the boundary in the adjusted image to be closer to a difference in luminance of the boundary in the first input image, and
converting the result of the multiplication into a time domain;

calculating a first derivative of luminance of a pixel included in the contrast sensitivity adjusted image in which the boundary in the adjusted image is emphasized;
calculating a second derivative of the luminance of the pixel included in the contrast sensitivity adjusted image in which the boundary in the adjusted image is emphasized;
accumulating the first and second derivatives;
determining a burn-in causing boundary based at least in part on a weighted sum of the accumulated first and second derivatives of the luminance of the pixel included in the contrast sensitivity adjusted image in which the boundary in the adjusted image is emphasized;
receiving a second input image;
comparing the burn-in causing boundary to a boundary of the second input image to determine whether to apply burn-in compensation; and
compensating, at a controller, a portion of the second input image corresponding to the burn-in causing boundary based at least in part on an unsharpening filter.

2. The method of claim 1 , wherein the calculating of the first derivative includes using a first mask, wherein the first mask comprises at least one of the following matrices:

(

-
1

-
2

-
1

0

0

0

1

2

1

)

⁢

⁢
and
⁢

⁢

(

-
1

0

1

-
2

0

2

-
1

0

1

)

.

3. The method of claim 2 , wherein the calculating of the second derivative includes using a second mask, wherein the second mask comprises at least one of the following matrices:

(

0

1

0

1

-
4

1

0

1

0

)

,

(

0

-
1

0

-
1

4

-
1

0

-
1

0

)

,

(

1

1

1

1

-
8

1

1

1

1

)

Assignees

• Samsung Display Co Ltd

Inventors

• Park Dong-Won
• Jang Yong-Jun
• Kim Gi-Geun
• Oh Won-Sik
• Lee Eun-Ho
• Lee Hyun-Dae

Classifications

• G09G2320/046

  Dealing with screen burn-in prevention or compensation of the effects thereof · CPC title

• G09G2360/16

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

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G5/18 Primary

  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