| 摘要 |
By detecting surrounding illuminance with a reception unit (340) provided on a display controller (300), a change in the illuminance is recognized. A microcomputer (370) determines presence/absence of user's input operation through a terminal operating section (330) of a display controller (300). When recognizing the input operation, the microcomputer (370) restricts a process of calculating, with a luminance controller (360), a luminance control value that sets the luminance of an image display (320) to the luminance corresponding to a change in the illuminance and outputting the luminance control value to the image display (320) until a predetermined time has elapsed even if the illuminance has changed during the predetermined time. This prevents a situation where a user cannot see clearly a display window due to the change in the luminance at input operation time, thereby facilitating the input operation.
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