Display device and method for driving the same

Patent metadata

Field	Value
Publication number	US-9412304-B2
Application number	US-201514965726-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Dec 24, 2014
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A special mode processor drives a display panel to display an image. When the display panel is configured to operate in a special operation mode, the special operation mode processor determines a pixel block size for blocking the plurality of pixels into a plurality of pixel blocks and determines a first set of on-pixels and a first set of off-pixels. The first set of on-pixels is initially turned on and the first set of off-pixels is initially turned off. A drive history representative value is generated for the first group of pixels that represents a drive time and drive characteristic for the first group of pixels. The drive history representative value is compared with a threshold value. Responsive to the drive history representative value exceeding the threshold value, a second set of on-pixels and a second set of off-pixels are turned on and off respectively.

First claim

What is claimed is:

1. A method for driving a display panel to display an image, the method comprising:
configuring the display panel to operate in a special operation mode, the display panel comprising a plurality of pixels;
determining, by a special operation mode processor, a pixel block size for blocking the plurality of pixels into a plurality of pixel blocks and determining a first set of on-pixels and an first set of off-pixels, the first set of on-pixels including at least a first group of pixels comprising at least one pixel in each of the plurality of pixel blocks and the first set of off-pixels including at least a second group of pixels comprising at least one pixel in each of the plurality of blocks;
turning on the first set of on-pixels and turning off the first set of off-pixels;
generating a drive history representative value for the first group of pixels, the drive history representative value representing a drive time and drive characteristic for the first group of pixels;
comparing the drive history representative value with a threshold value;
responsive to the drive history representative value exceeding the threshold value, determining a second set of on-pixels and a second set of off-pixels, the second set of on-pixels including at least the second group of pixels and the second set of off-pixels including at least the first group of pixels; and
turning on the second set of on-pixels and turning off the second set of off-pixels.

2. The method of claim 1 , further comprising:
configuring the display panel to operate in a normal operation mode; and
while in the normal operation mode, turning on the first and second groups of pixels.

3. The method of claim 1 , wherein determining the pixel block size and determining the first set of on-pixels and the first set of off-pixels comprises:
performing an image analysis of the image; and
based on the image analysis, determining a desired drive ratio for driving the display panel;
determining the pixel block size, the first set of on-pixels, and the first set of off-pixels such that a total number of pixels in the first set of on-pixels to a total number of pixels in the image matches the desired drive ratio.

4. The method of claim 1 , wherein determining the pixel block size and determining the first set of on-pixels and the first set of off-pixels comprises:
determining a resolution of the input image; and
responsive to the resolution of the input image being above a resolution threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a first on-pixel ratio representing a ratio of a total number of pixels in the first set of on-pixels to a total number of pixels in the image; and
responsive to the resolution of the input image being below the resolution threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a second on-pixel ratio lower than the first on-pixel ratio.

5. The method of claim 1 , determining the pixel block size and determining the first set of on-pixels and the first set of off-pixels comprises:
determining an average luminance of the input image; and
responsive to the average luminance of the input image being above a luminance threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a first on-pixel ratio representing a ratio of a total number of pixels in the first set of on-pixels to a total number of pixels in the image; and
responsive to the average luminance of the input image being below the luminance threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a second on-pixel ratio lower than the first on-pixel ratio.

6. The method of claim 1 , determining the pixel block size and determining the first set of on-pixels and the first set of off-pixels comprises:
determining an motion metric of the input image; and
responsive to the motion metric of the input image being above a motion threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a first on-pixel ratio representing a ratio of a total number of pixels in the first set of on-pixels to a total number of pixels in the image; and
responsive to the motion metric of the input image being below the motion threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a second on-pixel ratio lower than the first on-pixel ratio.

7. The method of claim 1 , determining the pixel block size and determining the first set of on-pixels and the first set of off-pixels comprises:
determining a complexity metric of the input image representing a number and distribution of edges; and
responsive to the complexity metric of the input image being above a complexity threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a first on-pixel ratio representing a ratio of a total number of pixels in the first set of on-pixels to a total number of pixels in the image; and
responsive to the complexity metric of the input image being below the complexity threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a second on-pixel ratio lower than the first on-pixel ratio.

8. The method of claim 1 , wherein determining the pixel block size and determining the first set of on-pixels and the first set of off-pixels comprises:
determining a gray level distribution of the input image; and
responsive to the gray level distribution of the input image being above a gray level distribution threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a first on-pixel ratio representing a ratio of a total number of pixels in the first set of on-pixels to a total number of pixels in the image; and
responsive to the gray level distribution of the input image being below the gray level distribution threshold, determining the pixel block size, the first set of on-pixels, and the first set of off-pixels to meet a second on-pixel ratio lower than the first on-pixel ratio.

9. The method of claim 1 , wherein determining the pixel block size and determining the first set of on-pixels and the first set of off-pixels comprises:
separating the image into foreground pixels representative of foreground objects and background pixels representative of a background scene of the image;
determining, for the foreground pixels, a foreground pixel block size, a foreground set of on-pixels, and a foreground set of off-pixels to meet a foreground on-pixel ratio; and
determining, for the background pixels, a background pixel block size, a background set of on-pixels, and a background set of off-pixels to meet a background on-pixel ratio, lower than the foreground on-pixel ratio.

10. The method of claim 1 , wherein the first group of pixels are positioned at corresponding first pixel locations within each of the plurality of pixel blocks and wherein the second group of pixels are positioned at corresponding second locations within each of the plurality of pixel blocks.

11. The method of claim 1 , wherein the first set of on-pixels are positioned such that for a given column of pixels in the image, each non-edge on-pixel in the given column is adjacent to an on-pixel from a different pixel block.

12. The method of claim 1 , wherein turning on the on-pixels and turning off the off-pixels comprises:
generating, by a gate driver, scan line signals to sequentially turn on rows of pix

Assignees

• Lg Display Co Ltd

Inventors

• Park Dongwon
• Hong Heejung
• Ahn Younghwan
• Park Jongmin
• Lee Joonhee
• Kwon Yongchul

Classifications

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G2330/04

  Display protection · CPC title

• G09G2330/021

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

• G09G2360/16

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