Apparatus for detecting afterimage candidate region and apparatus including the same for preventing afterimage

Patent metadata

Field	Value
Publication number	US-2017091583-A1
Application number	US-201615377411-A
Country	US
Kind code	A1
Filing date	Dec 13, 2016
Priority date	Sep 9, 2013
Publication date	Mar 30, 2017
Grant date	—

Abstract

An apparatus for detecting an afterimage candidate region includes: a comparison unit which compares gradation data of an n-th frame with integrated gradation data of an (n−1)-th frame and generates integrated gradation data of the n-th frame, where n is a natural number; a memory which provides the integrated gradation data of the (n−1)-th frame to the comparison unit and stores the integrated gradation data of the n-th frame; and an afterimage candidate region detection unit which detects an afterimage candidate region based on the integrated gradation data of the n-th frame, where each of the integrated gradation data of the n-th frame and the integrated gradation data of the (n−1)-th frame comprises a comparison region and a gradation region.

First claim

What is claimed is:

1 . An apparatus for detecting an afterimage candidate region, comprising:
an edge enhancement unit which generates edge enhanced gradation data of an n-th frame from gradation data of the n-th frame, wherein n is a natural number; a comparison unit which compares the edge enhanced gradation data of the n-th frame with integrated gradation data of an (n−1)-th frame and generates integrated gradation data of the n-th frame; a memory which provides the integrated gradation data of the (n−1)-th frame to the comparison unit and stores the integrated gradation data of the n-th frame; and an afterimage candidate region detection unit which detects the afterimage candidate region based on the integrated gradation data of the n-th frame, wherein each of the integrated gradation data of the n-th frame and the integrated gradation data of the (n−1)-th frame comprises a comparison region and a gradation region.

2 . The apparatus for detecting an afterimage candidate region of claim 1 , wherein
the edge enhanced gradation data of the n-th frame corresponds to a change amount of gradation of the gradation data of the n-th frame.

3 . The apparatus for detecting an afterimage candidate region of claim 1 , wherein
the number of bits of the gradation data of the n-th frame, the number of bits of the edge enhanced gradation data of the n-th frame, and the number of bits of the integrated gradation data of the n-th frame are equal to each other.

4 . The apparatus for detecting an afterimage candidate region of claim 1 , wherein
the comparison region has a size of a-bits and the gradation region has a size of b-bits, wherein a and b are natural numbers, a value of the gradation region of the integrated gradation data of the n-th frame is equal to a value of upper b-bits of the gradation data of the n-th frame.

5 . The apparatus for detecting an afterimage candidate region of claim 1 , wherein
the comparison unit sequentially compares upper c-bits of the gradation region of the integrated gradation data of the (n−1)-th frame with upper c-bits of the edge enhanced gradation data of the n-th frame bit by bit, wherein c is a natural number, when values of corresponding bits of the upper c-bits of the gradation region of the integrated gradation data of the (n−1)-th frame and the upper c-bits of the edge enhanced gradation data of the n-th frame are the same as each other, the comparison unit sets a value of the comparison region of the integrated gradation data of the n-th frame as a value increased from a value of the comparison region of the integrated gradation data of the (n−1)-th frame, when the values of the corresponding bits of the upper c-bits of the gradation region of the integrated gradation data of the (n−1)-th frame and the upper c-bits of the edge enhanced gradation data of the n-th frame are different from each other, the comparison unit stops the comparison and resets the value of the comparison region of the integrated gradation data of the n-th frame.

6 . The apparatus for detecting an afterimage candidate region of claim 1 ,
wherein the comparison unit compares upper c-bits of the gradation region of the integrated gradation data of the (n−1)-th frame with upper c-bits of the edge enhanced gradation data of the n-th frame to detect corresponding bits of the gradation region of the integrated gradation data of the (n−1)-th frame and the gradation data of the n-th frame having a same value, wherein c is a natural number, a plurality of weight values, which is different from each other, is defined to correspond to the upper c-bits, when the identification value is greater than a reference value, the comparison unit sets the value of the comparison region of the integrated gradation data of the n-th frame as a value increased from the value of the comparison region of the integrated gradation data of the (n−1)-th frame, and when the identification value is less than a reference value, the comparison unit resets the value of the comparison region of the integrated gradation data of the n-th frame.

7 . An apparatus for preventing an afterimage, comprising:
an afterimage candidate region detection unit which receives image data comprising gradation data of an n-th frame and detects an afterimage candidate region, wherein n is a natural number; and a correction unit which corrects the gradation data of the n-th frame corresponding to the afterimage candidate region, wherein the afterimage candidate region detection unit comprises:
a comparison unit which compares the gradation data of the n-th frame with integrated gradation data of an (n−1)-th frame and generates integrated gradation data of the n-th frame;
a memory which provides the integrated gradation data of the (n−1)-th frame to the comparison unit and stores the integrated gradation data of the n-th frame; and
an afterimage candidate region detection unit which detects the afterimage candidate region based on the integrated gradation data of the n-th frame,
wherein each of the integrated gradation data of the n-th frame and the integrated gradation data of the (n−1)-th frame comprises a comparison region and a gradation region.

8 . The apparatus for preventing an afterimage of claim 7 , wherein
the correction unit corrects the gradation data of the n-th frame such that a speed of a gradation change of an edge of the afterimage candidate region is reduced.

9 . The apparatus for preventing an afterimage of claim 7 , wherein
the correction unit corrects the gradation data of the n-th frame such that the width of a gradation region arranged at an edge of the afterimage candidate region is increased.

10 . The apparatus for preventing an afterimage of claim 7 , wherein
the correction unit corrects the gradation data of the n-th frame such that the afterimage candidate region continuously performs translational motion leftward and rightward or upward and downward.

Assignees

• Samsung Display Co Ltd

Inventors

• Jang Yong Jun
• Choi Nam Gon
• Goh Joon Chul
• Kim Gi Geun
• Park Geun Jeong
• Park Cheol Woo
• Baek Yun Ki
• So Jeong Hun
• Lee Dong Gyu

Classifications

• G06V10/758

  Involving statistics of pixels or of feature values, e.g. histogram matching · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G5/10

  Intensity circuits · CPC title

• G06K9/6212 Primary

  Physics · mapped topic

• G06K9/4604

  Physics · mapped topic