Patent Number: 6,297,786

Title: Liquid crystal display apparatus

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 C1) of the upper screen and the driving signal (common signal C2) of the lower screen change in one cycle of four frame periods. More specifically, in the above-mentioned cycle, the common signal C1 changes in a pattern (1.fwdarw.1.fwdarw.1.fwdarw.-1), and the common signal C2 changes in a pattern (1.fwdarw.-1.fwdarw.1.fwdarw.1) in synchronization with each other. Accordingly, upon comparison of the common signals C1 and C2, 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.

Inventors: Kakuta; Ryohei (Fukushima-ken, JP), Nagakubo; Hideaki (Fukushima-ken, JP), Tokita; Seiji (Fukushima-ken, JP), Masumoto; Yoshifumi (Fukushima-ken, JP)

Assignee: Alps Electric Co., Ltd.

International Classification: G02F 1/133 (20060101); G02F 1/13 (20060101); G09G 3/36 (20060101); G09G 003/36 ()

Expiration Date: 10/02/2018