Abstract: A power saving method is provided. The power saving method is applicable to an electronic device including a display unit. The method comprises the steps of determining a start point on the display unit, determining whether the start point is located in a bright area of the display unit, receiving a signal corresponding to an end point on the display unit, generating a trigger signal according to the start point and the end point, and darkening the brightness of an area between the start point and the end point on the display unit according to the trigger signal.

Abstract: A power saving method is provided. The power saving method is applicable to an electronic device including a display unit. The method comprises the steps of determining a start point on the display unit, determining whether the start point is located in a bright area of the display unit, receiving a signal corresponding to an end point on the display unit, generating a trigger signal according to the start point and the end point, and darkening the brightness of an area between the start point and the end point on the display unit according to the trigger signal.

Abstract: An anti-theft system applicable to a portable electronic device is provided in the present invention. The anti-theft system includes an input unit, a storage unit and a processing unit. The input unit is configured to receive code information. The storage unit is configured to store a first operating system, a second operating system and predetermined code information. The processing unit is configured to compare the code information with the predetermined code information. When the code information matches the predetermined code information, the processing unit enables the first operating system. When the code information does not match the predetermined code information, the processing unit enables the second operating system.