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:
Aug. 27, 2002
Filed:
Jul. 25, 2001
Tomoaki Nakao, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A DA converter is for converting N-bit digital signals to 2 analog signals, and includes a reference voltage generating circuit for generating the reference voltages having 2 +1 voltage levels, a reference voltage selector circuit for selecting two reference voltages having adjacent voltage levels according to the A bits of a digital signal, an output voltage selector circuit for selecting one interpolation voltage from 2 −1 interpolation voltages predetermined between the voltage levels of the two reference voltages in accordance with the N-A bits of the digital signal, and a voltage follower circuit for producing the above interpolation voltage by linear interpolation based on the two reference voltages. With this structure, 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 with more gradation levels, large increases in the number of circuit composing elements can be avoided, thus preventing an increase in manufacturing cost and permitting the production of more compact devices.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile