Patent ID: 8295886

Claim:
A mobile terminal, comprising: a display unit having a backlight; a power supply configured to output a drive current to the backlight; an illuminance sensor configured to detect an ambient illuminance and to output a corresponding sensor current; a backlight controller operatively connected to the illuminance sensor and configured to control a brightness of illumination of the backlight by regulating the drive current according to a change in the ambient illuminance detected by the illuminance sensor; a controller operatively connected to the backlight controller and to the illuminance sensor and configured to monitor an operation state of the backlight controller and to change a set value of a register by cooperating with the backlight controller; a limiter configured to limit a regulating voltage to not exceed a predetermined voltage level; and a delay unit configured to limit the drive current to allow the brightness of illuminance of the backlight to change in a gradual manner during a predetermined delay time when the ambient illuminance suddenly changes if the amount of ambient illumination change exceeds a predetermined value, and otherwise to allow the brightness of illumination of the backlight to change abruptly.