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. 22, 2001
Filed:
Oct. 21, 1998
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An interface circuit which performs level shifting with respect to an inputted digital signal with a small amplitude and outputs a digital signal with a greater amplitude than that of the inputted digital signal is equipped with a filter circuit composed of a low-pass filter and a comparator circuit composed of a plurality of comparators. Digital signals with small amplitudes are supplied to non-inverting input terminals of the comparators, respectively, while a reference voltage signal which is obtained by filtering, through the filter circuit, one predetermined digital signal among the digital signals supplied to the non-inverting input terminals is supplied to every inverting input terminal of the comparators. By so doing, it is possible to provide an interface circuit and a liquid crystal driving circuit which ensure that EMI noise is reduced and various problems which tend to occur in the case where display data input lines increase in number is avoided.