Patent ID: 8816980

Claim:
A portable electronic device, comprising: a display module operable to display a first screen comprising a first image corresponding to a first function; a touch panel operable to detect a touch contact by a user thereon; a proximity detection module operable to detect an object of a user when the object is in contact with the portable electronic device; and a control module operable to: execute the first function; display the first screen with a first luminance when the object is not detected while the first function is being executed; display a second screen with a second luminance lower than the first luminance when the object is detected while the first function is being executed, the second screen comprising a predefined area, and a second image corresponding to a second function; and determine the touch contact is one of: a valid contact if a touch location of the touch contact is in the predefined area; and an invalid contact if the touch location is outside the predefined area; change the second luminance to a third luminance of the second screen when the touch contact is the valid contact during execution of the first function while the second screen is displayed, wherein the third luminance is higher than the second luminance; and execute the second function in response to the valid contact during execution of the first function while the second screen is displayed.