Patent ID: 8847953

Claim:
A head mounted display (HMD) comprising: a camera unit configured to detect a first marker and a second marker; a display unit configured to display an augmented reality image corresponding to at least one of the first marker and the second marker; and a controller configured to control the camera unit and the display unit, wherein the controller is further configured to: detect at least a part of a 3-dimensional (3D) printer as the first marker through the camera unit, display a first augmented reality image of a shape of a 3-dimensional (3D) object based on the detected first marker before the 3D object is output by the 3D printer, detect at least a part of the 3D object, which is output from the 3D printer, as the second marker when the 3D printer starts to output the 3D object, update the first augmented reality image to a second augmented reality image based on both the first marker and the second marker, and display the second augmented reality image, and wherein the controller is further configured to display a move of the entire first augmented reality image from one location outside the 3D printer to another location inside the 3D printer when a movement of the at least the part of the 3-dimensional (3D) printer from the one location outside the 3D printer to the another location inside the 3D printer is detected prior to the output of the 3D object.