Portable terminal equipment and method of controlling backlight display therein
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 18, 2004
Grant Date -
Nov 15, 2001
app pub date -
Dec 6, 2000
filing date -
Dec 8, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
When the amount of remaining battery power is limited, a battery life can be extended while established function can be maintained available enough. A battery remaining power amount monitoring portion 4 monitors the amount of remaining battery power. On lighting the backlight within a liquid crystal display 1, when a controlling portion 6 determines the amount of remaining battery power to be higher than or equal to a predetermined level based on the result of monitoring in the battery remaining power amount monitoring portion 4, the controlling portion 6 causes the width of a pulse outputted to an LED driving portion 5 to be a determined width, and when the controlling portion 6 determines the amount of remaining battery power to be lower than the predetermined level, it causes the width of a pulse outputted to the LED driving portion 5 to be a narrower width than the determined width.
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