| 摘要 |
An electronic device (102) includes a display screen (104), a backlight (217) for illuminating the display screen (104), and a timer for indicating the expiration of a given time period, wherein when the backlight (217) is first turned on, the timer is initialized to indicate if the expiration of a first predetermined illumination time period occurs. An image capture component (110) is operable to acquire one or more images of a scene in front of the display screen (104); and a processor (204) is operable to analyze the one or more images to determine whether a user is present in front of the display screen (104), to control the timer if a user is determined to be present such that the timer is reset to indicate if the expiration of a second predetermined illumination time period occurs, and to control the backlight (217) to dim it or turn it off if the timer indicates an expiration has occurred.
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