Patent ID: 6069449
Filing Date: 2000-05-30
Classification: G02F,H05B

Abstract:
A device for controlling brightness of a backlight used to backlight an LCD panel, comprising:a backlight temperature sensing section for measuring a temperature of the backlight to thereby output a backlight temperature signal;a kind-of-battery detecting section for detecting a kind of a battery used to feed power to the backlight to thereby output a kind-of-battery signal;a remaining battery power detecting section for detecting a remaining power of the battery to thereby output a remaining battery power signal;a backlight section for controlling a power to be fed to the backlight; and a controller for delivering to said backlight section a signal for increasing the power to be fed to the backlight only if a backlight temperature represented by said backlight temperature signal is above a preselected reference temperature, if a kind of the battery represented by said kind-of-battery signal is a specific kind, and if a remaining battery power represented by said remaining battery power signal is above a preselected reference power.