Digital portable telephone set having backlighted display with r

Details Digital portable telephone set having backlighted display with r Digital portable telephone set having backlighted display with r

1997-03-18

2000-09-12

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455343, 455383, 455572, H04B 138, H04B 700, H04B 116, H04M 100

Patent

active

061190233

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.

REFERENCES:
patent: 4675863 (1987-06-01), Paneth et al.
patent: 5010566 (1991-04-01), Seo
patent: 5487181 (1996-01-01), Dailey et al.

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