Head-mounted display device and contact lens used therein

A head-mounted display device, comprising:

• an image projector, configured to project an optical signal according to a projecting direction;
• and
• a contact lens, set on an eyeball of a user, wherein a normal direction of the contact lens forms an incident angle with the projection direction, the contact lens comprises:
• a first optical structure layer, configured to receive the optical signal, wherein the first optical structure layer is divided into a plurality of partitions, and the partitions respectively have a plurality of structural bodies with different structures, and the structural bodies receive the optical signal and generate a plurality of imported optical signals;
• and
• a second optical structure layer, overlapped with the first optical structure layer, configured to transmit the imported optical signals to a target area,
• wherein each of the partitions is directly disposed on the second optical structure layer.