Head-mounted display device with a flip-up display

1. A display device, comprising:

a display;

an optical assembly;

a display-moving assembly connected to the display for moving the display between at least a first position and a second position, wherein:

(i) when in the first position, the display outputs image light in a 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;

a partial reflector; and

a partial-reflector-moving assembly connected to the partial reflector for moving the partial reflector between at least 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.

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 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 positioned to receive the image light output by the display and redirect at least a portion of the image light, through the optical assembly, to a reference pupil.

4. The display device of claim 3 , wherein:

when the display is in the second position, the partial reflector in the fourth position is further positioned to transmit ambient from an outside of the display device toward the reference pupil.

5. The display device of claim 1 , wherein the partial-reflector-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 partial reflector 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 partial reflector and (ii) at the fourth end to the hinge,

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

6. The display device of claim 1 , wherein the display-moving assembly is configured to move the display concurrently with the partial-reflector-moving assembly moving the partial reflector.

7. The display device of claim 1 , 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.

8. The display device of claim 7 , 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.

9. The display device of claim 8 , 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.

10. The display device of claim 1 , 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.

11. The display device of claim 1 , 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 toward a 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 toward the reference pupil.

12. The display device of claim 11 , 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; and

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.

13. The display device of claim 12 , 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 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 via the second optical path, to the reference pupil.

14. A method performed at a display device including a display, an optical assembly, a display-moving assembly, a partial reflector, and a partial-reflector-moving assembly, the method comprising:

moving, with the display-moving assembly connected to the display, the display between at least a first position and a second position, wherein:

(i) when in the first position, the display outputs image light in a 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; and

moving, with the partial-reflector-moving assembly connected to the partial reflector, the partial reflector between at least 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.

15. The method of claim 14 , wherein, when the display is in the second position, the display and the optical assembly define an angle that is at least 75 degrees.

16. The method of claim 14 , 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 positioned to receive the image light output by the display and redirect at least a portion of the image light, through the optical assembly, to a reference pupil.

17. The method of claim 16 , wherein:

when the display is in the second position, the partial reflector in the fourth position is further positioned to transmit ambient from an outside of the display device toward the reference pupil.

18. The method of claim 14 , wherein;

the partial-reflector-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 partial reflector 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 partial reflector and (ii) at the fourth end to the hinge; and

the method further includes moving, with the hinge, the partial reflector between the third position and the fourth position.

19. The method of claim 14 , further including moving, with the display-moving assembly, the display concurrently with moving, with the partial-reflector-moving assembly, the partial reflector.

20. The method of claim 14 , 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; and

the method further includes moving, with the first arm, the display between the first position and the second position by moving the end portion of the first arm along the first track.