Patent ID: 7592984

Claim:
A mobile phone comprising: a display portion comprising: a first light emitting element; a second light emitting element; a first driving thin film transistor wherein one of a source region and a drain region of the first driving thin film transistor is electrically connected to the first light emitting element; a second driving thin film transistor wherein one of a source region and a drain region of the second driving thin film transistor is electrically connected to the second light emitting element; a switching thin film transistor wherein one of a source region and a drain region of the switching thin film transistor is electrically connected to a gate electrode of the first driving thin film transistor and a gate electrode of the second driving thin film transistor, a current supply line; a first analog switch for controlling a connection between the current supply line and the other of the source region and the drain region of the first driving thin film transistor; and a second analog switch for controlling a connection between the current supply line and the other of the source region and the drain region of the second driving thin film transistor, wherein the display portion is configured to display an image on a first display screen and an image on a second display screen located on an opposite surface of the first display screen, and wherein the display portion is configured to be capable of switching between vertical display and horizontal display.