| 摘要 |
A portable electronic device includes a main body, a display screen mounted on the main body, a track ball, a light source, a camera module and a signal processor. The track ball has a reflecting pattern provided on an outer surface thereof and is rotatable relative to the main body. The light source is configured (i.e., structured and arranged) for illuminating the main body. The camera module is configured for receiving and converting the light reflected from the track ball into electronic image signals containing movement information of the reflecting pattern of the track ball. The signal processor is configured for controlling movement of a cursor on the display screen according to the movement information of the reflecting pattern of the track ball contained in the electronic image signals.
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