A display device of an air conditioner comprising: a film part including a displayable image; a controller configured to determine whether or not to display the displayable image on the basis of operation information of the air conditioner touch-recognized by the film part; a light emitting part configured to illuminate light toward the film part in order to display the displayable image; and a display part (101, 301, 401, 501) provided on a panel (20, 430) of the air conditioner to enable a touch input, and on which the light illuminated from the light emitting part acts, wherein the display part comprises a display area for displaying operation information of the air conditioner, and an input area for allowing a user to input a command concerning the operation information, and wherein the controller is configured to control the display part such that the operation information displayed on the display area is changed and/or displayed according to an input in the input area, characterized in that the display part (101, 301, 401, 501) comprises a wheel input part (150, 250, 350, 450, 550) having a circular or elliptical shape, and the display area and the input area are disposed on an inner area of the wheel input part; and in that the wheel input part (150, 250, 350, 450, 550) comprises: a first line extended in one direction from a center of the wheel input part toward a circumferential surface; and a second line extended in another direction from the center of the wheel input part toward the circumferential surface; wherein the input area is an inner area defined by the first line and the second line within the wheel input part. a film part including a displayable image; a controller configured to determine whether or not to display the displayable image on the basis of operation information of the air conditioner touch-recognized by the film part; a light emitting part configured to illuminate light toward the film part in order to display the displayable image; and a display part (101, 301, 401, 501) provided on a panel (20, 430) of the air conditioner to enable a touch input, and on which the light illuminated from the light emitting part acts, wherein the display part comprises a display area for displaying operation information of the air conditioner, and an input area for allowing a user to input a command concerning the operation information, and wherein the controller is configured to control the display part such that the operation information displayed on the display area is changed and/or displayed according to an input in the input area, characterized in that the display part (101, 301, 401, 501) comprises a wheel input part (150, 250, 350, 450, 550) having a circular or elliptical shape, and the display area and the input area are disposed on an inner area of the wheel input part; and in that the wheel input part (150, 250, 350, 450, 550) comprises: a first line extended in one direction from a center of the wheel input part toward a circumferential surface; and a second line extended in another direction from the center of the wheel input part toward the circumferential surface; wherein the input area is an inner area defined by the first line and the second line within the wheel input part. a first line extended in one direction from a center of the wheel input part toward a circumferential surface; and a second line extended in another direction from the center of the wheel input part toward the circumferential surface; wherein the input area is an inner area defined by the first line and the second line within the wheel input part.