US 11,719,940 B2
Head-mounted display device
Fu-Ming Chuang, Hsin-Chu (TW); and Hsin-Hsiang Lo, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on May 25, 2022, as Appl. No. 17/752,857.
Claims priority of application No. 202110658634.6 (CN), filed on Jun. 15, 2021.
Prior Publication US 2022/0397764 A1, Dec. 15, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 5/10 (2006.01); G02B 26/08 (2006.01); G02B 26/10 (2006.01); G03B 5/06 (2021.01)
CPC G02B 27/0172 (2013.01) [G02B 5/10 (2013.01); G02B 26/0833 (2013.01); G02B 26/0883 (2013.01); G02B 26/101 (2013.01); G03B 5/06 (2013.01); G02B 2027/0174 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A head-mounted display device, comprising a projection device and an optical waveguide, wherein
the projection device has an optical pupil, and comprises a light source, a first MEMS mirror element, a second MEMS mirror element, and a relay optical element group, wherein
the light source is configured to provide a light beam;
the first MEMS mirror element is located on a transmission path of the light beam;
the second MEMS mirror element is located on the transmission path of the light beam, wherein the first MEMS mirror element is located between the second MEMS mirror element and the light source, and the second MEMS mirror element directly receives the light beam reflected from the first MEMS mirror element; and
the relay optical element group is located on the transmission path of the light beam and between the second MEMS mirror element and the optical pupil, wherein the relay optical element group has a first axis equivalent focal length corresponding to a first parallel light beam on a first reference plane and has a second axis equivalent focal length corresponding to a second parallel light beam on a second reference plane, the first parallel light beam and the second parallel light beam travel along an optical axis of the relay optical element group, and the optical axis is located on the first reference plane and the second reference plane at the same time, the first reference plane and the second reference plane are orthogonal to each other, and a value of the first axis equivalent focal length is different from a value of the second axis equivalent focal length; and
the optical waveguide is located on the transmission path of the light beam and has a first surface and a second surface opposite to each other, wherein the first surface is located between the relay optical element group and the second surface, and the optical pupil is located on the second surface.