Display device and control method thereof

A display device comprising:

• a display unit configured to display at least one 3D object having different depths;
• a touch sensor unit configured to sense a touch input on the display unit;
• a tactile feedback unit configured to generate a tactile feedback corresponding to the 3D object;
• and
• a processor configured to control the display unit, the touch sensor unit, and the tactile feedback unit,
• wherein the processor is further configured to:
• enable a tactile feedback function,
• if the touch input is sensed, determine whether or not a first touch position of the touch input is within a first display area of a first 3D object having a first depth, wherein the first display area is a display area in the XY plane of the first 3D object,
• if the first touch position is within the first display area, adjust the first depth to make a first surface of the first 3D object coincide with a surface of the display unit and generate a first tactile feedback corresponding to the first 3D object.