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. 25, 2010
Filed:
Mar. 28, 2007
Tomoharu Yamaguchi, Kodaira, JP;
Tomoharu Yamaguchi, Kodaira, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A display drive device comprises a display element being colored by injecting an electric charge into an electrolyte via an display electrode due to an oxidation-deoxidization reaction and being decolored by injecting an electric charge having an inverse polarity of the electric charge into the electrolyte, at least one constant current supply circuit which supplies a constant current as a decoloration current pulse having a predetermined pulse width to the display electrode upon the decoloration, a voltage detection circuit which detects a voltage value generated in the display electrode, and a control circuit which controls an operation of the constant current supply circuit intermittently and repeatedly supplying the decoloration current pulse from the constant current supply circuit to the display electrode upon the decoloration, and ending the decoloration on the basis of a voltage value to be detected by the voltage detection circuit.