Patent ID: 7970443

Claim:
A mobile phone comprising: an expandable screen comprising a main screen and an extension screen, the expandable screen having a first display mode that the main screen is enabled while the extension screen is disabled, a second display mode that the main screen is disabled while the extension screen is enabled, and a third display mode that the main screen and the extension screen are enabled; and a magnet attached to the main screen; a detector attached to the extension screen for detecting magnetic intensity of the magnet; wherein the expandable screen is in the expanded state when a minimum value of the magnetic intensity is detected; and an input device adapted to generate a display mode command in response to a user's operation; wherein the mobile phone comprises a folded state that a backside of the main screen is overlaid with the extension screen, and the mobile phone comprises an expanded state that the extension screen is unfolded from the main screen; and wherein when the mobile phone is in the expanded state, the expandable screen is configured to be in one of the first display mode, the second display mode, and the third display mode based on the display mode command.