| 摘要 |
PROBLEM TO BE SOLVED: To extend the service life of a battery, while fully utilizing a set function in the case that a residual capacity of the battery is less. SOLUTION: A battery remaining capacity monitor section 4, monitors the remaining capacity of the battery and when a liquid crystal display device 1 lights a backlight, when the remaining capacity of the battery becomes a predetermined level or higher on the basis of a monitor result by the battery residual capacity monitor section 4, a control section 6 gives a pulse with a decided width to an LED drive section 5, and when the remaining capacity of the battery becomes a predetermined level or lower, the control section 6 gives a pulse with a width narrower than the decided width to a LED drive section 5. |
