Head mounted display device

A display device, comprising:

• a display unit to emit light including image information, the display unit including a plurality of pixels arranged in a first plane;
• an optical unit, at least a portion of the light emitted by the display unit being incident on the optical unit, the optical unit including a first optical element, a travel direction of the at least the portion of the light being modified by the first optical element;
• a reflector to reflect the at least a portion of the light modified by the first optical element,
• a first direction perpendicular to the first plane being non-parallel to an optical axis of the first optical element;
• the reflector having a first surface and spreading along the first surface,
• a first angle between the optical axis and a second plane, the first angle being larger than a second angle between the second plane and the first direction, the second plane being tangent to the first surface and passing through an intersection of the optical axis and the first surface,
• wherein the second plane is parallel to a second direction perpendicular to a third plane including the optical axis and the first direction, a portion of the light emitted by the display unit reflected by the reflector toward a pupil of a viewer is separated from the third plane.