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:
Apr. 16, 2002
Filed:
Dec. 16, 1999
Tomoaki Nakao, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A standard voltage generating circuit produces 2 +1 mutually different standard voltages. A selector circuit stores standard voltage pairs so that each of the digital signals corresponds to one of the standard voltage pairs. No standard voltage pairs produce the same mean value. Upon reception of an input digital signal, the selector circuit selects one of the standard voltage pairs which corresponds to the input digital signal and provides the standard voltages of the selected pair for output. The standard voltages provided for output by the selector circuit are supplied to a voltage follower circuit which provides an output voltage having a mean value of the input standard voltages. In a DA converter and a liquid crystal driving device incorporating the DA converter, despite a possible increase in the number of voltages required for a display of more colors and more half-tones, large increases in the number of circuit arrangement elements can be avoided and increases in manufacturing cost can be restrained, allowing the device to be built in a more compact size.