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. 28, 2012
Filed:
Dec. 22, 2008
Hongsung Song, Kyungbuk, KR;
Woongki Min, Daegu, KR;
Yonggi Son, Kyungnam, KR;
Suhyuk Jang, Daegu, KR;
Hongsung Song, Kyungbuk, KR;
Woongki Min, Daegu, KR;
Yonggi Son, Kyungnam, KR;
Suhyuk Jang, Daegu, KR;
LG Display Co., Ltd., Seoul, KR;
Abstract
A liquid crystal display device and a driving method thereof are provided which can increase a display grade by removing a DC residual image. The liquid crystal display device comprises: a liquid crystal display panel for displaying gray levels by a potential difference between a common electrode for applying a common voltage and pixel electrodes for applying data voltages; a common voltage regulating circuit for generating a variable common voltage which is longitudinally symmetrical with respect to a DC common voltage of a predetermined level and whose voltage level is stepwisely varied at predetermined intervals; and a black gamma reference voltage regulating circuit for adding the variable common voltage to an offset voltage set as a gamma reference voltage of a black gray level to generate a variable gamma reference voltage varying with respect to the gamma reference voltage of the black gray level, the variable gamma reference voltage of the black gray level being varied in synchronization with the variable common voltage.