Augmented reality device
An augmented reality (AR) device is provided. The AR device includes a display configured to output light of a first polarization; a polarization-conversion reflector provided opposite to an output side of the display, the polarization-conversion reflector converting the light of the first polarization into light of a second polarization that is orthogonal to the first polarization and reflect the light of the second polarization; a waveguide having a flat plate shape, a normal line of a flat surface of the flat plate shape being inclined with respect to an optical axis of the light of the first polarization output from the display, a side of the waveguide being provided between the display and the polarization-conversion reflector; an input-coupler inputting the light of the second polarization into the waveguide; and an output-coupler outputting light propagating in the waveguide.
1. An augmented reality (AR) device comprising:
a display configured to output light of a first polarization in a first direction;
a polarization-conversion reflector provided opposite to an output side of the display, a reflective surface thereof extending along a second direction perpendicular to the first direction, the polarization-conversion reflector converting the light of the first polarization into light of a second polarization that is orthogonal to the first polarization and reflecting the light of the second polarization;
a waveguide having a flat plate shape, a normal line of a flat surface of the flat plate shape being inclined with respect to the first direction, a side of the waveguide being provided between the display and the polarization-conversion reflector;
an input-coupler inputting the light of the second polarization into the waveguide; and
an output-coupler outputting light propagating in the waveguide.
2. The AR device of claim 1 , wherein the display is provided at a side of the waveguide from which the light is output from the waveguide by the output-coupler.
3. The AR device of claim 1 , wherein the display comprises:
a display engine configured to output image light; and
a polarization converter converting the image light output from the display engine into the light of the first polarization.
4. The AR device of claim 3 , wherein the polarization converter comprises a circular polarizer polarization-converting the light output from the display engine into light of circular polarization, and
the polarization-conversion reflector comprises a reflective mirror.
5. The AR device of claim 3 , wherein the polarization converter comprises a linear polarizer and a ¼ wave plate that are arranged along a traveling path of the light output from the display engine, and
the polarization-conversion reflector comprises a reflective mirror.
6. The AR device of claim 5 , wherein the polarization converter further comprises a ½ wave plate provided between the linear polarizer and the ¼ wave plate.
7. The AR device of claim 3 , wherein the display engine is further configured to output image light of linear polarization,
the polarization converter comprises a ¼ wave plate, and
the polarization-conversion reflector comprises a reflective mirror.
8. The AR device of claim 3 , wherein the first polarization is right-circular polarization, and
the input-coupler is a left-circular polarization diffraction grating diffracting light of left-circular polarization.
9. The AR device of claim 3 , wherein the first polarization is left-circular polarization, and the input-coupler is a right-circular polarization diffraction grating diffracting light of right-circular polarization.
10. The AR device of claim 3 , wherein the polarization converter comprises a linear polarizer polarization-converting the light output from the display engine into light of linear polarization, and
the polarization-conversion reflector comprises a reflective mirror, and a ¼ wave plate provided between the waveguide and the reflective mirror.
11. The AR device of claim 3 , wherein the polarization converter comprises a linear polarizer and a ½ wave plate that are arranged along a traveling path of the light output from the display engine, and
the polarization-conversion reflector comprises a reflective mirror and a ¼ wave plate arranged between the waveguide and the reflective mirror.
12. The AR device of claim 3 , wherein the first polarization is x-axis linear polarization, and
the input-coupler is a y-axis linear polarization diffraction grating diffracting light of y-axis linear polarization.
13. The AR device of claim 3 , wherein the first polarization is y-axis linear polarization, and
the input-coupler is an x-axis linear polarization diffraction grating diffracting light of x-axis linear polarization.
14. The AR device of claim 1 , wherein the AR device is AR glasses and further comprises a frame and temples connected at opposite ends of the frame, and
the display is mounted in at least one side of the temples.
15. The AR device of claim 1 , wherein the AR device is AR glasses or a head-mounted display device.
16. The AR device of claim 1 , wherein the polarization-conversion reflector is fixed with respect to the optical axis of the light of the first polarization.