An electronic device comprising: a housing, a display panel arranged in the housing, wherein an edge of the housing is arranged to cover a portion of the display panel so that a display area of said portion of the display panel is not exposed to an outside of the electronic device, a display driving circuit electrically connected to the display panel, and a processor configured to generate a background image (10, 11) which either includes a first object generated in a first area of the background image (10, 11) and a second object generated in a second area of the background image (10, 11) or does not include the first object and the second object, the processor being further configured to transmit the background image (10, 11) to the display driving circuit, the first area of the background image (10, 11) corresponding to said display area of said portion of the display panel which is not exposed to an outside of the electronic device and the second area of the background image (10, 11) corresponding to a display area of the display panel which is exposed to the outside of the electronic device, wherein the display driving circuit is configured to: determine whether the first object exists in the first area of the background image (10, 11) when the background image (10, 11) is received; in response to determining that the first object exists in the first area of the background image, output the background image through the display panel; in response to determining that the first object does not exist in the first area of the background image: generate a partial image having a size smaller than a size of the background image (10, 11), and merge the partial image into the second area of the background image (10, 11) and output the merging result through the display panel. a housing, a display panel arranged in the housing, wherein an edge of the housing is arranged to cover a portion of the display panel so that a display area of said portion of the display panel is not exposed to an outside of the electronic device, a display driving circuit electrically connected to the display panel, and a processor configured to generate a background image (10, 11) which either includes a first object generated in a first area of the background image (10, 11) and a second object generated in a second area of the background image (10, 11) or does not include the first object and the second object, the processor being further configured to transmit the background image (10, 11) to the display driving circuit, the first area of the background image (10, 11) corresponding to said display area of said portion of the display panel which is not exposed to an outside of the electronic device and the second area of the background image (10, 11) corresponding to a display area of the display panel which is exposed to the outside of the electronic device, wherein the display driving circuit is configured to: determine whether the first object exists in the first area of the background image (10, 11) when the background image (10, 11) is received; in response to determining that the first object exists in the first area of the background image, output the background image through the display panel; in response to determining that the first object does not exist in the first area of the background image: determine whether the first object exists in the first area of the background image (10, 11) when the background image (10, 11) is received; in response to determining that the first object exists in the first area of the background image, output the background image through the display panel; in response to determining that the first object does not exist in the first area of the background image: generate a partial image having a size smaller than a size of the background image (10, 11), and merge the partial image into the second area of the background image (10, 11) and output the merging result through the display panel.