Light scattering element for providing optical cues for lens position adjustment

1. A method, comprising:

providing, in a head-mounted display device with one or more display screens and a lens, a cue for adjusting a location of the lens by:

displaying a first image on the one or more display screens;

projecting the first image through the lens and a first anisotropic light scattering element;

focusing, with the lens, and transmitting, through the first anisotropic light scattering element, the first image displayed on the one or more display screens while the head-mounted display device is in a lens position adjustment mode; and

focusing, with the lens, an image displayed on the one or more display screens without transmitting through the first anisotropic light scattering element while the head-mounted display device is in a display mode that is distinct from the lens position adjustment mode.

2. The method of claim 1 , including:

prior to projecting the first image through the first anisotropic light scattering element, positioning the first anisotropic light scattering element for projecting the first image through the first anisotropic light scattering element.

3. The method of claim 1 , including:

subsequent to projecting the first image through the first anisotropic light scattering element, positioning the first anisotropic light scattering element so that an image on the one or more display screens ceases to be projected through the first anisotropic light scattering element.

4. The method of claim 1 , wherein:

the first image on the one or more display screens is positioned away from an optical axis of the first anisotropic light scattering element so that the optical axis of the first anisotropic light scattering element does not intersect the first image.

5. The method of claim 1 , further comprising:

receiving a user input that corresponds to a request to move the first anisotropic light scattering element; and

in conjunction with receiving the user input, moving the first anisotropic light scattering element.

6. The method of claim 1 , wherein:

the first anisotropic light scattering element is coupled with the lens; and

adjusting the location of the lens includes adjusting a location of the first anisotropic light scattering element.

7. The method of claim 1 , wherein the first image is a first high contrast image including one or more discrete objects having high brightness surrounded by low brightness background, a contrast ratio between the high brightness of the one or more discrete objects and a brightness of the low brightness background being at least 10:1.

8. The method of claim 1 , wherein the first anisotropic light scattering element is a Fresnel lens.

9. The method of claim 1 , wherein the first anisotropic light scattering element is a transmission mask having a plurality of concentric transmission rings.

10. The method of claim 1 , wherein the lens is a lens free from concentric structures.

11. The method of claim 1 , including:

positioning the first anisotropic light scattering element in a first position for the lens position adjustment mode of the head-mounted display device so that the first anisotropic light scattering element projects the first image displayed on the one or more display screens, while the first anisotropic light scattering element is in the first position, for providing the cue for adjusting the location of the lens; and

positioning the first anisotropic light scattering element in a second position that is distinct from the first position for the display mode, of the head-mounted display device, that is distinct from the lens position adjustment mode so that the first anisotropic light scattering element ceases to project the first image displayed on the one or more display screens while the first anisotropic light scattering element is in the second position.

12. The method of claim 1 , further comprising:

projecting, with the one or more display screen, a second image that is distinct from the first image through a second anisotropic light scattering element that is distinct from the first anisotropic light scattering element while the head-mounted display device is in the lens position adjustment mode.

13. The method of claim 1 , comprising:

displaying a second image that is distinct from the first image on the one or more display screens; and

projecting the second image through a second anisotropic light scattering element.

14. The method of claim 13 , wherein:

the lens of the head-mounted display device is a first lens;

the first anisotropic light scattering element is coupled with the first lens; and

the second anisotropic light scattering element is coupled with a second lens that is distinct from the first lens.

15. The method of claim 14 , further comprising:

receiving a user input that corresponds to a request to change an interpupillary distance of the first lens and the second lens; and

in conjunction with receiving the user input, moving the first lens and the second lens laterally to change the interpupillary distance of the first lens and the second lens.

16. The method of claim 15 , wherein:

the first image is projected toward one of a left eye and a right eye; and

the second image is projected toward the other of the left eye and the right eye.

17. A method, comprising:

receiving a cue for adjusting a position of a lens of a head-mounted display device having one or more display screens, including:

receiving a projection of a first image displayed on the one or more display screens, focused by the lens and transmitted through a first anisotropic light scattering element while the head-mounted display device is in a lens position adjustment mode; and

in conjunction with receiving the projection of the first image, adjusting the position of the lens based on the projection of the first image; and

receiving a projection of an image displayed on the one or more display screens, focused by the lens without transmitting the projection through the first anisotropic light scattering element while the head-mounted display device is in a display mode that is distinct from the lens position adjustment mode.