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:
Oct. 28, 2014
Filed:
Dec. 10, 2009
Tatsuhiko Suyama, Osaka, JP;
Norio Ohmura, Osaka, JP;
Tatsuhiko Suyama, Osaka, JP;
Norio Ohmura, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A liquid crystal display apparatus is disclosed, which is capable of suppressing sound emission caused by the AC drive of liquid crystal while suppressing an increase in power consumption. A non-active period during which polarity reversal of a common electrode signal (VCOM) is repeated at predetermined intervals is provided in each horizontal scanning period. During an active period, a common electrode drive circuit provides a common electrode signal (VCOM) indicating either one of potentials LVand LVto a common electrode, based on a polarity instruction signal (POL). During the non-active period, the common electrode drive circuit provides a common electrode signal (VCOM) whose potential changes between LVand LVto the common electrode, based on a reversal timing control signal (CTRL). Here, the amplitude of the common electrode signal (VCOM) for the non-active period is made smaller than the amplitude of the common electrode signal (VCOM) for the active period.