| 摘要 |
According to one embodiment, a portable electronic device includes a housing with a built-in processor, a touchscreen display arranged on a surface of the housing, a temperature sensor configured to detect a temperature within the housing, a brightness adjustment module, and a brightness control module. The brightness adjustment module adjusts a brightness of the touchscreen display so as to set the touchscreen display to a brightness value specified by user operation. If the detected temperature is greater than or equal to a first threshold value, the brightness control module reduces an upper limit value of a brightness range applicable to the touchscreen display.
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