US Patent 7567245 Information processing device and display brightness control method

An information processing device comprises a display unit whose display brightness is changeable, a unit for detecting the lightness of surroundings, a unit for determining a target display brightness of the display unit responsive to the lightness detected by the unit for detecting the lightness, and a unit for changing the display brightness of the display unit in steps until the target display brightness is reached when changing the display brightness to the target display brightness determined by the unit for determining the target display brightness.