SYSTEMS, DEVICES, AND METHODS FOR EMBEDDING A HOLOGRAPHIC OPTICAL ELEMENT IN AN EYEGLASS LENS
Systems, devices, and methods for embedding a HOE in an eyeglass lens are described. A method of embedding a HOE in an eyeglass lens includes forming a world-side portion of the eyeglass lens, forming an eye-side portion of the eyeglass lens, physically coupling the eye-side portion of the eyeglass lens to the HOE with a low-temperature optically clear adhesive (“LT-OCA”), and physically coupling the world-side portion of the eyeglass lens to the HOE with LT-OCA. Forming the lens portions may include high-temperature processes, and the HOE may not be damaged by the high-temperature processes since the high-temperature processes may be performed on the lens portions prior to coupling the lens portions to the HOE.
1 . A wearable heads-up display comprising:
a support structure;
an projector; and
a transparent combiner positioned and oriented to appear in a field of view of an eye of a user when the support structure is worn on a head of the user, the transparent combiner comprising:
a lens assembly, wherein the lens assembly comprises:
an eye-side lens portion; and
a world-side lens portion;
a holographic optical element (“HOE”) positioned within the lens assembly in between the eye-side lens portion and the world-side lens portion;
a first low-temperature optically clear adhesive (“LT-OCA”) layer disposed between the HOE and the eye-side lens portion of the lens assembly; and
a second LT-OCA layer disposed between the HOE and the world-side lens portion of the lens assembly.
2 . The wearable heads-up display of claim 1 wherein the world-side lens portion includes a world-side surface, and wherein the world-side lens portion further comprises a coating layer disposed on the world-side surface of the world-side lens portion, the coating layer comprising a high-temperature coating.
3 . The wearable heads-up display of claim 1 wherein the eye-side lens portion includes an eye-side surface, and wherein the eye-side lens portion further comprises a coating layer disposed on the eye-side surface of the eye-side lens portion, the coating layer comprising a high-temperature coating.
4 . The wearable heads-up display of claim 1 wherein the HOE includes a photopolymer layer and a protective layer.
5 . The wearable heads-up display of claim 1 wherein the world-side lens portion includes a curved world-side surface and the eye-side lens portion includes a curved eye-side surface.
6 . The wearable heads-up display of claim 1 wherein the HOE is planar, and wherein the world-side lens portion includes a planar eye-side surface and the eye-side lens portion includes a planar world-side surface.
7 . The wearable heads-up display of claim 1 wherein the HOE is curved around a center or axis of curvature located on the eye-side of the eyeglass lens, and wherein the world-side lens portion includes a curved eye-side surface and the eye-side lens portion includes a curved world-side surface.
8 . The wearable heads-up display of claim 1 wherein the first LT-OCA layer and the second LT-OCA layer both comprise a cured LT-OCA layer.
9 . The wearable heads-up display of claim 1 wherein the lens assembly has a refractive power in a range of −20 to +20 diopters.
10 . The wearable heads-up display of claim 1 wherein the eye-side lens portion comprises a first lens material and wherein the world-side lens portion comprises a second lens material, and wherein the first lens material and the second lens material are the same lens material.
11 . The wearable heads-up display of claim 1 wherein the eye-side lens portion comprises a first lens material and wherein the world-side lens portion comprises a second lens material, and wherein the first lens material is different from the second lens material.
12 . The wearable heads-up display of claim 1 wherein the first LT-OCA layer comprises a first LT-OCA and wherein the second LT-OCA layer comprises a second LT-OCA layer, and wherein the first LT-OCA and the second LT-OCA are the same LT-OCA.
13 . The wearable heads-up display of claim 1 wherein the first LT-OCA layer comprises a first LT-OCA and wherein the second LT-OCA layer comprises a second LT-OCA layer, and wherein the first LT-OCA is different from the second LT-OCA.
14 . The wearable heads-up display of claim 1 wherein the HOE comprises a light guide.
15 . The wearable heads-up display of claim 1 wherein the HOE comprises a low refractive index layer.
16 . The wearable heads-up display of claim 1 wherein the HOE comprises an internal anti-reflective layer.