Electronic device including sub display and method of operating same

An electronic device comprising:

• a housing;
• a first display disposed in the housing and including a transparent area;
• a module assembly disposed under the transparent area and configured to be visible to an outside of the housing;
• a second display disposed between the first display and the module assembly and configured to cover at least a portion of the module assembly by moving with respect to the first display;
• at least one DDI configured to operate the first display and/or the second display;
• a driver configured to move the second display with respect to the transparent area;
• and
• a processor electrically connected with the at least one DDI and configured to control an operation of the first display and/or the second display,
• wherein the second display comprises a first area in which an image is output and a second area formed along an edge of the first area, and
• wherein the processor is configured to move the second display using the driver based on an operation of the electronic device.