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. 02, 2000
Filed:
Aug. 14, 1997
Takehiko Sone, Fukushima-ken, JP;
Takehiro Ishikawa, Fukushima-ken, JP;
Alps Electric Co., Ltd., , JP;
Abstract
A liquid crystal display apparatus is provided in which crosstalk (after-image extending from a line displayed on the screen) is eliminated. Drive circuitry used in the above type of apparatus is also provided. A delay circuit divides an alternating-current (AC) signal generated by an alternating-current (AC) signal circuit into two signals, i.e., a common AC signal (DF COM) and a segment AC signal (DF SEG). One signal is delayed later than the other. When the common AC signal is delayed later than the segment AC signal, white crosstalk (which is a white bar having a brightness level higher than a white background, appearing on the line extending from a narrow black bar displayed on the screen) is eliminated from the screen. On the other hand, when the segment AC signal is delayed later than the common AC signal, black crosstalk (which is a black bar having a brightness level slightly lower than a white background, emerging on the line extending from a thick black bar displayed on the screen) is removed from the screen. An integrating circuit or a delay line is employed as a delay function of the delay circuit.