Portable electronic device and method for waking up the same from sleep mode through touch screen

摘要

A portable electronic device including a touch screen, a micro processing unit, a central processor and a display is provided. The central processor can operate in a normal operation mode or a sleep mode. The touch screen overlays the display, and includes a first touch area, a second touch area and at least one electrode. When the central processor operates in the sleep mode and one of the first and second touch areas senses a touch, the at least one electrode generates a touch signal. The micro processing unit determines whether the touch is sensed by the first or the second touch area according to the touch signal. If the touch is sensed by the second touch area, the micro processing unit outputs a wake-up signal to the central processing unit, so as to switch the central processor from the sleep mode to the normal operation mode.

主权项

1. A portable electronic device, comprising:
a central processor, capable of operating in a sleep mode and a normal operation mode; a display, having a display area for displaying information; a touch screen, overlaid on the display and having a first touch area, a second touch area, a first electrode extending from the first touch area to the second touch area along a first direction, and a second electrode extending along a second direction substantially perpendicular to the first direction, wherein the first touch area and the second touch area are respectively formed by a part of the touch screen, the first touch area is electrically connected to the second touch area through the first electrode, and the second touch area extends along the second direction and is close to the second electrode; and a micro processing unit, electrically connected to the first electrode, wherein when the central processor is operated in the sleep mode, the micro processing unit is for: detecting a touch signal from the first electrode; comparing a voltage value corresponding to the touch signal with a predetermined value to obtain a comparison result; determining which one of the first touch area and the second touch area senses a touch according to the comparison result; and outputting a wake-up signal to the central processor to switch the central processor from the sleep mode to the normal operation mode when the second touch area senses the touch, and when the central processor is operated in the sleep mode and the first touch area senses the touch, the micro processing unit does not output the wake-up signal.