Patent ID: 8860656

Claim:
A portable device comprising: a flexible display unit; a measurement unit configured to sense an open position and a closed position of the flexible display unit; a sensor unit configured to sense a user input; and a processor configured to control the flexible display unit, the measurement unit, and the sensor unit, wherein the portable device provides a dimming mode for dimming the flexible display unit when lack of the user input within a dimming time is sensed, wherein the processor is further configured to: convert the portable device from a first dimming mode to a second dimming mode when a change of the flexible display unit from the open position to the closed position is detected, wherein the first dimming mode provides a first dimming time and the second dimming mode provides a second dimming time, and wherein the second dimming time is shorter than the first dimming time, if the user input is sensed within the second dimming time in the second dimming mode, revert the portable device from the second dimming mode to the first dimming mode, and if the user input is not sensed within the second dimming time in the second dimming mode, perform dimming of the flexible display unit when the second dimming time is reached.