Patent ID: 8565829

Claim:
A mobile terminal, comprising: a main device configured to perform wireless communication and having a display configured to display first data; and a secondary device configured to be detachably coupled to the main device and having a transparent touch panel input unit configured to display second data, the transparent touch panel input unit configured to receive input from a user, the secondary device being further configured to position the transparent touch panel input unit to at least partially overlap the display of the main device when the secondary device is coupled to the main device and to communicate with the main device when coupled to the main device and when separated from the main device, wherein at least a portion of the first data displayed on the display of the main device is visible behind the second data displayed on the transparent touch panel input unit of the secondary device when the transparent touch panel input unit of the secondary device is positioned overlapping the display of the main device, wherein input received at the transparent touch panel input unit of the secondary device controls the main device, wherein the transparent touch panel input unit operates as a transparent display when the secondary device is coupled to the main device and the transparent touch panel input unit is overlapped with the display of the main device, and the transparent touch panel input unit operates as an opaque display when the secondary device is detached from the main device, and wherein the secondary device detached from the main device executes a visual function in response to an input thereof and displays output generated from execution of the visual function on the transparent touch panel input unit while the main device detached from the secondary device performs a call communication with a remote communication device.