Patent ID: 11960085
Assignee: CORETRONIC CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 15:
16. A waveguide adapted for a head mounted display device to receive an image provided by a display unit of the head mounted display device, wherein
the waveguide is located on a transmission path of the image beam, and the waveguide comprises:
a first plate;
a plurality of optical films, each of the plurality of the optical films is configured to perform partial transmission and partial reflection on the image beam; and
a plurality of first optical micro structures, configured to be located in the first plate, wherein 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; and
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 wherein 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.