| 摘要 |
A drive control circuit (200) of a backlight (220) includes a drive circuit (240) that drives the backlight (220), a voltage detection unit (250) that detects whether or not a supply voltage Vp from a battery (210) is less than or equal to a threshold value, and a controller (260) that controls the operation of the drive circuit (240). When the supply voltage Vp from the battery (210) is less than or equal to the threshold value, the drive circuit (240) changes a drive current to be supplied to the backlight (220) to a low current value. Furthermore, in response to a change in the drive current, the controller (260) provides, to the drive circuit (240), a PWM signal to extend a time period for which the backlight (220) are on. |
