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:
Sep. 12, 2000
Filed:
Mar. 18, 1997
Applicant:
Inventor:
Yutaka Tomiyori, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ; H04B / ; H04B / ; H04M / ;
U.S. Cl.
CPC ...
455574 ; 455343 ; 455383 ; 455572 ;
Abstract
In a cellular phone set with a backlighted display, a power amplifier is ON/OFF-controlled in a time division fashion for communicating. A backlight source is driven by a backlight driving circuit synchronized with the ON/OFF control of the power amplifier so that the backlight source is turned on and off when the power amplifier is in the OFF condition and the ON condition, respectively. A power supply for the backlight source is switched by a switching signal which is produced by an AND of a light-on signal for the backlight source and an inverted signal of the ON/OFF control signal for the power amplifier.