Head-mounted display device with a flip-up display

1. A display device, comprising:

a frame;

a display;

an optical assembly; and

a display-moving assembly connected to the display and the frame, the display-moving assembly configured to move the display between multiple different positions, including a first position and a second position, wherein:

(i) when in the first position, the display is configured to output image light in a first direction, the first direction substantially parallel to an optical axis of the optical assembly; and

(ii) when in the second position, the display is positioned away from the optical axis of the optical assembly so that the display does not intersect with the optical axis of the optical assembly, wherein:

the optical assembly has a first region and a second region;

when the display is in the first position:

the first region of the optical assembly is configured to receive the image light output by the display and transmit the image light toward a reference pupil, and

the second region of the optical assembly is configured to receive ambient light from an outside of the display device and transmit the ambient light toward the reference pupil; and

when the display is in the second position the first region and the second region of the optical assembly are configured to receive the ambient light and transmit the ambient light toward the reference pupil.

2. The display device of claim 1 , wherein, when the display is in the second position, the display and the optical assembly define an angle that is at least 75 degrees.

3. The display device of claim 1 , wherein the display-moving assembly includes:

a hinge;

a first linkage, having opposing first and second ends, connected (i) at the first end to a first end portion of the display and (ii) at the second end to the hinge; and

a second linkage, having opposing third and fourth ends, connected (i) at the third end to a second end portion of the display and (ii) at the fourth end to the hinge,

wherein:

the hinge is configured to move the display between the first position and the second position.

4. The display device of claim 3 , wherein the hinge is configured to move the display between the first position and the second position by rotating the hinge at least 75 degrees.

5. The display device of claim 1 , wherein:

the optical assembly is further configured to receive, when the display is in the first position, by a third region overlapping the first region and the second region, the image light output by display and the ambient light;

the image light output by the display corresponds to one or more images;

the ambient light corresponds to light from the outside the display device; and

the third region of the optical assembly is configured to combine the image light and the ambient light such that the one or more images of the image light are perceived by a user together with the ambient light.

6. The display device of claim 1 further comprising:

a partial reflector; and

a partial reflector-moving assembly connected to the partial reflector and the frame, the partial reflector-moving assembly configured to move the partial reflector between multiple different positions, including a third position and a fourth position, wherein:

when the partial reflector is in the third position, the display is in the first position and the display is disposed between the optical assembly and the partial reflector; and

when the partial reflector is in the fourth position, the display is in the second position.

7. The display device of claim 6 , wherein:

the display has an emitting surface and a non-emitting surface opposite to the emitting surface;

when the display is in the first position, the optical assembly faces the emitting surface of the display and the partial reflector faces the non-emitting surface; and

when the display is in the second position, the partial reflector in the fourth position (i) is disposed non-parallel to the optical assembly and the display and (ii) is at least partially facing the emitting surface of the display such that the partial reflector is configured to receive the image light output by the display and redirect at least a portion of the image light, through the optical assembly, to the reference pupil.

8. The display device of claim 6 , wherein the partial reflector-moving assembly includes:

a hinge; and

a third linkage, having opposing fifth and sixth ends, connected (i) at the fifth end to a first end portion of the partial reflector and (ii) at the sixth end to the hinge; and

a fourth linkage, having opposing seventh and eighth ends, connected (i) at the seventh end to a second end portion of the partial reflector and (ii) at the eighth end to the hinge,

wherein:

the hinge is configured to move the partial reflector between the third position and the fourth position.

9. The display device of claim 6 , wherein the display-moving assembly is configured to move the display concurrently with the partial reflector-moving assembly moving the partial reflector.

10. The display device of claim 6 , wherein the display-moving assembly includes:

a first arm having an end portion connected to the display; and

a first track, wherein the end portion of the first arm is slidably connected to the first track, wherein:

the first arm is configured to move the display between the first position and the second position by moving the end portion of the first arm along the first track.

11. The display device of claim 10 , wherein the partial reflector-moving assembly includes:

a second arm having an end portion connected to the partial reflector; and

a second track, wherein the end portion of the second arm is slidably connected to the second track, wherein:

the second arm is configured to move the partial reflector between the third position and the fourth position by moving the end portion of the second arm along the second track.

12. The display device of claim 11 , wherein the first arm and the second arm are coupled to form a joined arm such that the end portion of the first arm and the end portion of the second arm form opposing end portions of the joined arm, and the joined arm is configured to move the position of the display and the position of the partial reflector concurrently.

13. The display device of claim 6 , wherein the partial reflector is further configured to:

when the partial reflector is in the third position, receive ambient light and transmit at least a portion of the ambient light, through the second region of the optical assembly, to the reference pupil; and

when the partial reflector is in the fourth position, receive the ambient light and transmit at least a portion of the ambient light, through the first region and the second region of the optical assembly, toward the reference pupil.

14. The display device of claim 6 , wherein:

the partial reflector has a curved shape; and

the partial reflector is further configured to, when the partial reflector is in the fourth position, focus the image light output by the display.

15. The display device of claim 6 , wherein:

the image light has first circular polarization;

the optical assembly includes an additional partial reflector, a retarder plate, and a reflective polarizer, the retarder plate disposed between the additional partial reflector and the reflective polarizer;

when the display is in the first position:

the image light having the first circular polarization from the display is received by the optical assembly and transmitted through the optical assembly via a first optical path that includes reflection at the reflective polarizer and the additional partial reflector;

when the display is in the second position:

the image light from the display is received by the partial reflector and redirected as image light having second circular polarization distinct from the first circular polarization; and

the image light having the second circular polarization is received by the optical assembly and transmitted through the optical assembly via a second optical path that includes transmission through the reflective polarizer and the additional partial reflector.

16. The display device of claim 15 , wherein:

the partial reflector includes a retarder surface configured to change polarization of the ambient light to be the second circular polarization, and

the optical assembly is further configured to:

when the display is in the first position, receive the ambient light and transmit at least a portion of the ambient light, through the second region of the optical assembly, via the second optical path, to the reference pupil; and

when the display is in the second position, receive the ambient light and transmit at least a portion of the ambient light, through the first region and the second region of the optical assembly, via the second optical path, to the reference pupil.

17. A method performed at a display device including a frame, a display, an optical assembly and a display-moving assembly, comprising:

moving, with the display-moving assembly connected to the display and the frame, the display to a first position;

in response to moving the display to the first position, outputting, by the display, image light in a first direction, the first direction substantially parallel to an optical axis of the optical assembly; and

moving, with the display-moving assembly connected to the display and the frame, the display from the first position to a second position different from the first position, wherein the display is positioned away from the optical axis of the optical assembly when in the second position so that the display does not intersect with the optical axis of the optical assembly, and wherein:

the optical assembly has a first region and a second region;

the method includes:

when the display is in the first position:

receiving, with the first region of the optical assembly, the image light output by the display and transmit the image light toward a reference pupil, and

receiving, with the second region of the optical assembly, ambient light from an outside of the display device and transmitting the ambient light toward the reference pupil; and

when the display is in the second position, receiving, with the first region and the second region of the optical assembly, the ambient light and transmitting the ambient light toward the reference pupil.

18. The method of claim 17 , wherein:

the display device further includes a partial reflector and a partial reflector-moving assembly connected to the partial reflector and the frame, and

moving the display from the first position to the second position causes the partial reflector to move from a third position to a fourth position.

19. The method of claim 17 , wherein:

moving the display to the second position includes moving the display so that the display and the optical assembly define an angle that is at least 75 degrees.