Head mounted display and control method thereof

A head mounted display, comprising:

• a pico projector unit;
• an application processor for controlling the pico projector unit to project a virtual image having a virtual object located on a virtual image coordinate in a virtual image coordinate system;
• an eye image sensing unit for capturing eye image data;
• an adjustment unit;
• a sensing apparatus for sensing a touch object to output sensing data;
• an application specific integrated circuit (ASIC) for obtaining a real coordinate of the touch object in a real image coordinate system according to the sensing data, wherein the ASIC obtains a pupil position according to the eye image data, controls the adjustment unit to adjust an imaging position of the virtual image according to the pupil position, and determines whether the touch object touched the virtual object according to the pupil position, the real coordinate and the virtual coordinate;
• and
• an eyeglass frame supporting the adjustment unit, the pico projector unit, the application processor, the eye image sensing unit, the sensing apparatus and the ASIC,
• wherein, when the pupil position is located at the center of the eye, the ASIC converts the real coordinate into a first relative coordinate in the virtual coordinate system, and determines whether the first relative coordinate matches the virtual image coordinate, and the ASIC determines that the touch object touched the virtual object if the first relative coordinate matches the virtual image coordinate, and
• when the pupil position is not located at the center of the eye, the ASIC keeps the virtual coordinate unchanged, and correspondingly converts the real coordinate into a second relative coordinate, which differs with the first relative coordinate by a touch displacement, in the virtual coordinate system, and the ASIC determines whether the second relative coordinate matches the virtual image coordinate and determines that the touch object touched the virtual object if the second relative coordinate matches the virtual image coordinate.