Light guide element and head-mounted display device

Abstract

This present disclosure provides a light guide element including a waveguide, a coupling-in grating, and a coupling-out grating. The waveguide includes opposite first and second surfaces. The coupling-in grating and the coupling-out grating are spaced apart and disposed on the same surface of the waveguide or disposed respectively on the first surface and the second surface of the waveguide. The coupling-in grating is used to couple image light into the waveguide and transmits the image light towards the coupling-out grating within the waveguide. The coupling-out grating is used to couple the image light out of the waveguide. The light guide element also includes a first lens fixedly connected to the side of the waveguide from which the image light is emitted. The first lens is used to refract the optical path of the image light coupled out from the coupling-out grating, and the projection of the first lens onto the waveguide covers the coupling-out grating. This present disclosure also provides a head-mounted display device.

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