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:
Mar. 23, 1999
Filed:
Dec. 18, 1996
Applicant:
Inventors:
Sachito Horiuchi, Kyoto, JP;
Hiroyuki Ishikawa, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
3151693 ; 345 76 ; 345 77 ; 345212 ;
Abstract
In an EL element driving circuit, a fly back pulse generating circuit receives an electric power from a DC power source through a coil and generates fly back pulses by a switching circuit. The electric power of the fly back pulses is supplied to the EL element as a charging electric power and a current which flows from the DC power source to the coil by the switching operation of the switching circuit is controlled by an adjusting circuit which adjusts the ON period of the switching circuit within a period substantially corresponding to a period after the switching circuit is turned ON and until the current maximizes.