Head-mounted display device with a flip-up display

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.