Display device having optimum display posture and method for controlling the same

A method of controlling a display device having a display panel, a camera, and a posture adjustment driving unit configured to adjust a posture of the display unit, the method comprising:

• capturing, via the camera, a first image of a viewer viewing the display unit in a first posture when the display unit is positioned at a first height;
• moving, via the posture adjustment driving unit, the display unit to a second height different than the first height;
• capturing, via the camera, a second image of the viewer viewing the display unit in the first posture when the display unit is positioned at the second height;
• correcting, via a controller, at least one of the first image and the second image based on orientation information of the display unit on capturing the first image and the second image;
• generating, via the controller, a 3D body mesh of the viewer using the first image and the second image;
• calculating, via the controller, a viewer-optimized display unit posture setting based on the 3D body mesh;
• controlling, via the controller, the posture adjustment driving unit to move the display unit to a height corresponding to the viewer-optimized display unit posture setting;
• calculating, via a controller, a first pixel distance between two feature points of the viewer from the first image and the second image;
• calculating, via the controller, a first spaced distance from the camera to the viewer based on calculated first pixel distance between the two feature points of the viewer;
• storing, via the controller, data in a memory about the first spaced distance and the first pixel distance;
• capturing, via the camera, a third image of the viewer;
• calculating, via the controller, a second pixel distance between the two feature point of the viewer from the third image;
• calculating, via the controller, a second spaced distance from the camera to the viewer based on the second pixel distance between the two feature points of the viewer, and control the posture adjustment driving unit to adjust the posture of the display unit based on the second spaced distance from the camera to the viewer;
• determining, via the controller, if the viewer moved horizontally in the second image and the third image;
• storing, via the controller, the data about the first spaced distance and the first pixel distance if a horizontal movement of the viewer in the second image and the third image is within a prescribed pixel distance;
• calculating, via the controller, the first spaced distance and the first pixel distance based on the corrected at least one of the first image and the second image;
• calculating, via the controller, the second pixel distance based on 2D landmark information calculated from the third image;
• and
• correcting, via the controller, the second pixel distance based on 3D body skeleton information calculated from the third image.