Electronic device including a flexible display with variable region and method of heating the variable region of the flexible display

An electronic device comprising:

• a housing;
• a flexible display comprising a variable region drawn out from the housing to an outside or inserted into the housing from the outside in response to a screen size being changed;
• a display driver controlling the flexible display;
• a plurality of sensors sensing an external temperature of the electronic device, a temperature of the flexible display, and the variable region depending on a change in the screen size of the electronic device;
• a processor controlling the display driver and the plurality of sensors;
• and
• a memory operatively connected to the processor,
• wherein the memory stores instructions that cause, when executed, the processor to:
• measure the external temperature of the electronic device by using at least one of the plurality of sensors,
• calculate, from an entire region of the flexible display, a fixed region that is visually exposed to the outside regardless of the screen size of the electronic device, and a variable region that is visually exposed at least in part to the outside in a screen expansion or screen size change state of the electronic device,
• compare the external temperature with a preset first threshold temperature, thereby determining heating of the variable region in response to the external temperature being less than the preset first threshold temperature, and
• heat the variable region by controlling at least one of a luminance or a driving frequency of the variable region.