Free-form light field displays for VR/AR headsets
A head mounted display for virtual reality imaging includes a pixel array including multiple pixels configured in a two-dimensional surface, each pixel providing multiple light beams forming an image provided to a user. The head mounted display also includes a first optical element to provide a central portion of a field of view for the image through an eyebox that limits a volume including a pupil of the user, and a second optical element to provide a peripheral portion of the field of view for the image through the eyebox. The second optical element includes a lenslet array to provide a segmented view of the peripheral portion of the field of view that includes at least one of a free form lenslet, a liquid crystal lenslet, a Fresnel lenslet, or a pancake lenslet. A system and a method for using the above head mounted display are also provided.
1 . A device for virtual reality imaging, comprising:
a pixel array including multiple pixels configured in a two-dimensional surface, each pixel providing multiple light beams forming an image provided to a user, wherein the two-dimensional surface of the pixel array is flat;
a first optical element configured to provide a central portion of a field of view for the image through an eyebox that limits a volume including a pupil of the user; and
a second optical element configured to provide a peripheral portion of the field of view for the image through the eyebox, wherein the second optical element includes a freeform lenslet array to provide a segmented view of the peripheral portion of the field of view, wherein the second optical element includes multiple lenslets selected from at least one of: a free form lenslet, a liquid crystal lenslet, a Fresnel lenslet, and a pancake lenslet.
2 . The device of claim 1 , wherein the central portion and the peripheral portion of the field of view together occupy at least one half steradian of a user's field of view when the device is worn by the user.
3 . The device of claim 1 , wherein the peripheral portion of the field of view has a higher angular resolution in an area of the peripheral portion of the field of view adjacent to the central portion of the field of view, wherein other regions of the peripheral portion of the field of view have lower angular resolutions.
4 . The device of claim 1 , wherein the second optical element provides an angular resolution that decreases in the peripheral portion of the field of view proceeding in an axial direction away from the central portion of the field of view.
5 . The device of claim 1 , wherein the pixel array includes one of a flexible organic light emitting diode array, a flexible liquid crystal display, or a light emitting diode array.
6 . The device of claim 1 , wherein the freeform lenslet array comprises multiple lenslets arranged with a pitch greater than one fourth of a focal length of each lenslet of the multiple lenslets, and
wherein the light beams from a single pixel pass through the eyebox at a unique angle.
7 . The device of claim 1 , wherein the pixel array includes segmented portions of active pixels separated by a gap of inactive pixels, wherein two sub-portions of the peripheral portion of the field of view of the image from two adjacent segmented portions of multiple active pixels form a continuous image on a retina of the user, and the light beams from the segmented portions of active pixels go through the eyebox at an angle that is unique for each pixel, based on a location of the pupil of the user.
8 . A device for virtual reality imaging, comprising:
a pixel array including multiple pixels configured in a two-dimensional surface, each pixel providing multiple light beams forming an image provided to a user;
a first optical element configured to provide a central portion of a field of view for the image through an eyebox that limits a volume including a pupil of the user; and
a second optical element configured to provide a peripheral portion of the field of view for the image through the eyebox, wherein the second optical element includes a lenslet array to provide a segmented view of the peripheral portion of the field of view that includes multiple lenslets selected from at least one of: a free form lenslet, a liquid crystal lenslet, a Fresnel lenslet, and a pancake lenslet,
wherein the central portion and the peripheral portion of the field of view together occupy at least one half steradian of a user's field of view when the device is worn by the user.
9 . The device of claim 8 , wherein the peripheral portion of the field of view has a higher angular resolution in an area of the peripheral portion of the field of view adjacent to the central portion of the field of view, wherein other regions of the peripheral portion of the field of view have lower angular resolutions.
10 . The device of claim 8 , wherein the second optical element provides an angular resolution that decreases in the peripheral portion of the field of view proceeding in an axial direction away from the central portion of the field of view.
11 . The device of claim 8 , wherein:
the pixel array includes a conical display that wraps around the first optical element, and
the second optical element is a lenslet array that wraps around the first optical element to provide the peripheral portion of the field of view for the image through the eyebox.
12 . The device of claim 8 , wherein the two-dimensional surface follows a one-dimensional curvature.
13 . The device of claim 8 , wherein the pixel array includes one of a flexible organic light emitting diode array, a flexible liquid crystal display, or a light emitting diode array.
14 . The device of claim 8 , wherein the freeform lenslet array comprises multiple lenslets arranged with a pitch greater than one fourth of a focal length of each lenslet of the multiple lenslets, and
wherein the light beams from a single pixel pass through the eyebox at a unique angle.
15 . A device for virtual reality imaging, comprising:
a pixel array including multiple pixels configured in a two-dimensional surface, each pixel providing multiple light beams forming an image provided to a user;
a first optical element configured to provide a central portion of a field of view for the image through an eyebox that limits a volume including a pupil of the user; and
a second optical element configured to provide a peripheral portion of the field of view for the image through the eyebox, wherein the second optical element includes a lenslet array to provide a segmented view of the peripheral portion of the field of view that includes multiple lenslets selected from at least one of: a free form lenslet, a liquid crystal lenslet, a Fresnel lenslet, and a pancake lenslet,
wherein the pixel array includes segmented portions of active pixels separated by a gap of inactive pixels, wherein two sub-portions of the peripheral portion of the field of view of the image from two adjacent segmented portions of multiple active pixels form a continuous image on a retina of the user, and the light beams from the segmented portions of active pixels go through the eyebox at an angle that is unique for each pixel, based on a location of the pupil of the user.
16 . The device of claim 15 , wherein the peripheral portion of the field of view has a higher angular resolution in an area of the peripheral portion of the field of view adjacent to the central portion of the field of view, wherein other regions of the peripheral portion of the field of view have lower angular resolutions.
17 . The device of claim 15 , wherein the second optical element provides an angular resolution that decreases in the peripheral portion of the field of view proceeding in an axial direction away from the central portion of the field of view.
18 . The device of claim 15 , wherein:
the pixel array includes a conical display that wraps around the first optical element, and
the second optical element is a lenslet array that wraps around the first optical element to provide the peripheral portion of the field of view for the image through the eyebox.
19 . The device of claim 15 , wherein the two-dimensional surface follows a one-dimensional curvature.
20 . The device of claim 15 , wherein the pixel array includes one of a flexible organic light emitting diode array, a flexible liquid crystal display, or a light emitting diode array.