Patent ID: 8194091

Claim:
A portable display device configured to transition between a first state and a second state, the portable display device comprising: a display portion configured to display information when the portable display device is in the first state and when the portable display device is in the second state; a power source configured to supply power when the portable display device is in the first state, and to supply less power when the portable display device is in the second state than when the portable display device is in the first state; a controller configured to drive the display portion to display information in the display portion; an operation portion configured to execute at least one command in response to receipt of at least one operation; and a mode storage portion configured to store one of a first mode and a second mode, based on an operation of the operation portion, the first mode being different than the second mode, wherein the first mode corresponds to configuring preset information to be displayed in the display portion, and the second mode corresponds to configuring a particular information to be continuously displayed in the display portion, wherein the particular information corresponds to information displayed in the display portion when the portable display device is in the first state and the preset information is different from the particular information, wherein when the portable display device is in the second state, the controller is configured to display the preset information in the display portion when the first mode is stored in the mode storage portion, and to continuously display the particular information when the second mode is stored in the mode storage portion.