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:
May. 12, 1998
Filed:
May. 30, 1995
Yoshimitsu Inamori, Nara, JP;
Koichi Oda, Sakai, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In the case where a fed display data is to be displayed as it is, a display operation is executed in accordance with a predetermined first clock signal. In the case where a calculation operation is executed based on the fed display data and the calculation result is to be displayed as a display data, the display operation is executed in accordance with a second clock signal having a frequency higher than that of the first clock signal. In this way, the second clock signal is fed to a display device only when the calculation operation which requires a high speed processing is executed. Accordingly, power consumption can be reduced and an improved quality of display can be obtained. Further, an inversion signal is fed to the display device together with a display signal and a scan signal. The inversion signal is used for periodically switching the polarity of the display signal applied to the display device so as to prevent an occurrence that a direct current is applied to the display device. In the present invention, a first inversion signal and a second inversion signal having a frequency higher than that of the first inversion signal are switchably used. More specifically, in the case where there are relatively many displaying addresses on a column direction electrode, the second inversion signal is used.