Portable device and control method for the same

A portable device comprising:

• a flexible display unit;
• a measurement unit configured to sense a first state and a second state 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 the user input is not sensed within a preset dimming time,
• wherein the flexible display unit has the first state in which the flexible display unit is not expanded, and the second state in which the flexible display unit is expanded,
• wherein the processor is further configured to:
• convert the portable device from a first dimming mode to a second dimming mode when the flexible display unit is changed from the second state to the first state,
• wherein the preset dimming time in the first dimming mode is a first dimming time and the preset dimming time in the second dimming mode is 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 first state and the second dimming mode, revert the portable device from the second dimming mode into the first dimming mode, and
• if the user input is not sensed within the second dimming time in the first state and the second dimming mode, perform dimming of the flexible display unit when the second dimming time is reached.