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. 02, 2001
Filed:
Jul. 14, 1998
Ryohei Kakuta, Fukushima-ken, JP;
Hideaki Nagakubo, Fukushima-ken, JP;
Seiji Tokita, Fukushima-ken, JP;
Yoshifumi Masumoto, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
The screen of a liquid crystal panel is divided into two portions. In the divided screens (upper screen and lower screen), the corresponding common electrodes (each for one divided screen) are simultaneously driven. The driving signal (common signal C,) of the upper screen and the driving signal (common signal C,) of the lower screen change in one cycle of four frame periods. More specifically, in the above-mentioned cycle, the common signal C,changes in a pattern (1→1→1→−1), and the common signal C,changes in a pattern (1→−1→1→1) in synchronization with each other. Accordingly, upon comparison of the common signals C,and C,it appears that the signal having the same waveform is applied to the common electrodes while being out of phase with each other. Thus, a difference of the drive frequency between the upper screen and the lower screen is eliminated. It is thus possible to provide an inexpensive liquid crystal apparatus, which is connected to an existing dual-scan interface, without degrading the display quality.