METHOD AND SYSTEM FOR INTEGRATION OF REFRACTIVE OPTICS WITH A DIFFRACTIVE EYEPIECE WAVEGUIDE DISPLAY
A method of fabricating an optical element includes providing a substrate, forming a castable material coupled to the substrate, and casting the castable material using a mold. The method also includes curing the castable material and removing the mold. The optical element includes a planar region and a clear aperture adjacent the planar region and characterized by an optical power.
1 . A method of fabricating an optical element, the method comprising:
providing a substrate;
forming a castable material coupled to the substrate;
casting the castable material using a mold;
curing the castable material; and
removing the mold;
wherein the optical element comprises a planar region and a clear aperture adjacent the planar region and characterized by an optical power.
2 . The method of claim 1 wherein the substrate comprises a cover glass.
3 . The method of claim 2 wherein the cover glass is planar.
4 . The method of claim 1 wherein the substrate comprises a planar polymer structure.
5 . The method of claim 1 wherein the castable material comprises a UV cured resin.
6 . The method of claim 1 wherein the mold comprises an anti-stiction coating.
7 . The method of claim 6 wherein the anti-stiction coating is hydrophobic.
8 . The method of claim 6 wherein the anti-stiction coating comprises silicon oxide or silicon nitride.
9 . The method of claim 1 wherein casting the castable material comprises forming nano-features in the castable material.
10 . The method of claim 9 wherein the nano-features are diffractive features configured to reduce reflection at an interface of the castable material.
1 . A viewing optics assembly including a viewing area, the viewing optics assembly comprising:
a first cover plate including a first region having a first optical power and a first planar region laterally adjacent to the first region and positioned outside the viewing area;
a waveguide having a world side and a user side; and
a second cover plate having a second optical power, wherein the first optical power and second optical power have different values with respect to each other;
wherein the waveguide is disposed between the first cover plate and the second cover plate.
12 . The viewing optics assembly of claim 11 wherein:
the first cover plate is disposed adjacent the world side of the waveguide; and
the second cover plate is disposed adjacent the user side of the waveguide.
13 . The viewing optics assembly of claim 11 wherein the first optical power is positive and the second optical power is negative.
14 . The viewing optics assembly of claim 11 wherein the first optical power and an absolute value of the second optical power are equal.
15 . The viewing optics assembly of claim 11 wherein the first region of the first cover plate comprises nano-features.
16 . The viewing optics assembly of claim 15 wherein the nano-features comprise an anti-reflection structure.
17 . The viewing optics assembly of claim 11 wherein the second cover plate includes a second region having the second optical power, wherein the second region comprises nano-features.
18 . The viewing optics assembly of claim 11 wherein the second cover plate comprises a second region having the second optical power and a second planar region laterally 2 adjacent to the second region, wherein the second region is positioned outside the viewing area.
19 . The viewing optics assembly of claim 11 wherein:
the first cover plate is separated from the world side of the waveguide by a first distance; and
the second cover plate is separated from the user side of the waveguide by a second distance.
20 . The viewing optics assembly of claim 11 wherein:
the second cover plate is configured to diverge light rays generated by the waveguide; and
the first cover plate is configured to compensate for the second optical power of the second cover plate.