Head mounted display

A head mounted display, comprising:

• a body portion;
• a display panel provided in the body portion;
• a lens module disposed in front of the display panel and comprising an outer frame, a lens and a mounting portion, wherein the lens is provided in the outer frame, and has a central axis having a viewing point thereon, the mounting portion is disposed at the periphery of the outer frame, and a reference line is connected between the viewing point and the mounting portion;
• an infrared transmitter disposed on the mounting portion of the lens module, wherein the outer frame is provided with at least a light exit surface between the viewing point and the mounting portion, the infrared transmitter projects a light along the reference line via at least a light exit surface, and the light exit surface limits an exit angle of the light, wherein the mounting portion is a cavity for receiving the infrared transmitter, and the light exit surface is disposed on a lateral side of the cavity facing the viewing point;
• a light guide element disposed above the infrared transmitter for reflecting the light and changing an exit angle of the light, wherein the light guide element is a wedge plate having a bevel facing the light exit surface for guiding the light to the light exit surface;
• and
• an infrared receiver disposed on the body portion for receiving the light.