Patent ID: 7567245

Claim:
An information processing device comprising: a display unit having changeable display brightness; a detector configured to detect a lightness of surroundings; a calculating unit configured to calculate a target display brightness of the display unit based on the surrounding lightness detected by the detector; a selector configured to select a first mode when the difference between the target display brightness and the current display brightness is larger than a predetermined threshold brightness and a second mode when the difference between the target display brightness and the current display brightness is not larger than the predetermined threshold brightness; and a brightness control unit configured to supply a brightness control signal for changing a current display brightness to the display unit when the current display brightness does not equal the target display brightness, wherein, when the first mode is selected, the brightness control unit supplies a first brightness control signal changing the current display brightness by a predetermined brightness which is smaller than a difference between the current display brightness and the target brightness, and when the second mode is selected, the brightness control unit supplies a second brightness control signal changing the current display brightness by the difference.