The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 2007
Filed:
Jun. 08, 2001
Ichiro Sato, Kyotanabe, JP;
Katsuhiko Kumagawa, Neyagawa, JP;
Kazuo Inoue, Hirakata, JP;
Taro Funamoto, Ibaraki, JP;
Wataru Machidori, Amagasaki, JP;
Katsuyuki Arimoto, Okayama, JP;
Ichiro Sato, Kyotanabe, JP;
Katsuhiko Kumagawa, Neyagawa, JP;
Kazuo Inoue, Hirakata, JP;
Taro Funamoto, Ibaraki, JP;
Wataru Machidori, Amagasaki, JP;
Katsuyuki Arimoto, Okayama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
When displaying moving images by using liquid crystal panels and others, a problem exists in that tail streaks occur, and image degradation is resultantly caused. To solve this problem, an echo suppression circuit divides a video signal into a pair composed of two successive frames for comparison between these two frames in signal level for the purpose of suppressing an echo phenomenon occurring when a liquid crystal panel displays video signals including moving images. If these two frames are not the same in signal level, the signal is accordingly corrected so as to equalize the signal level of these frames. Based on the video signals and others corrected by the echo suppression circuit, a controller operates the liquid crystal panel with AC drive through a source driver and a gate driver. As such, the drive voltage used to operate the liquid crystal panel with AC drive is adjusted so as to be balanced between positive and negative. In this manner, the tail streaks are prevented when displaying moving images.