Waveguide and head mounted display device having waveguide

A head mounted display device comprising:

• a display unit, a first waveguide and a second waveguide, wherein
• the display unit is configured to provide an image beam;
• the first waveguide is located on a transmission path of the image beam, and the first waveguide comprises a first plate, a plurality of optical films and a plurality of first optical micro structures, wherein
• each of the plurality of the optical films is configured to perform partial transmission and partial reflection on the image beam,
• the plurality of first optical micro structures are located in the first plate, and the plurality of first optical micro structures comprise central optical micro structures, relay optical micro structures and edge optical micro structures, wherein at least one of the plurality of the optical films is located on the central optical micro structures or on the edge optical micro structures, the at least one of the plurality of the optical films has a reflectivity of the image beam and a transmittance of the image beam, and the reflectivity of the image beam is greater than the transmittance of the image beam;
• and
• wherein at least another one of the plurality of the optical films is located on the relay optical micro structures, the at least another one of the plurality of the optical films has a reflectivity of the image beam and a transmittance of the image beam, and the reflectivity of the image beam is less than the transmittance of the image beam, wherein
• the central optical micro structures are respectively located on two sides of a main axis of the image beam;
• the edge optical micro structures and the relay optical micro structures are respectively located on the two sides of the main axis of the image beam, and the central optical micro structures are closer to the main axis of the image beam than the edge optical micro structures, and the relay optical micro structures are provided between the central optical micro structures and the edge optical micro structures, wherein after the image beam enters the first plate through a first surface of the first plate, a part of the image beam passes through the central optical micro structures and leaves the first plate, an other part of the image beam is transmitted in the first plate after being reflected by the central optical micro structures, and a part of the other part of the image beam travels to the edge optical micro structures and leaves the first plate from a second surface of the first plate;
• the second waveguide is located on the transmission path of the image beam, wherein the first waveguide is located between the display unit and the second waveguide, the first waveguide is configured to transmit the image beam to the second waveguide and adjust a light shape of the image beam, the second waveguide is configured to transmit the image beam to outside of the head mounted display device, and the second waveguide comprises a second plate, a plurality of second optical micro structures and a plurality of light guide optical film patterns, wherein
• the second plate has a light incidence surface, and the light incidence surface connects a first surface and a second surface of the second plate;
• the second optical micro structures are located in the second plate, wherein each of the second optical micro structures has an optical surface, and the optical surfaces of the second optical micro structures are respectively inclined with respect to the first surface of the second plate;
• the light guide optical film patterns are located on the optical surfaces of the second optical micro structures, and the light guide optical film patterns are configured to allow a part of the image beam from the first waveguide to pass through and reflect an other part of the image beam from the first waveguide, wherein after the image beam enters the second plate through the light incidence surface, the part of the image beam from the first waveguide passes through the light guide optical film patterns, and the other part of the image beam from the first waveguide leaves the second plate from the second surface of the second plate after being reflected by the light guide optical film patterns.