US 2025/0020927 A1 · IMAGE LIGHT GUIDE HAVING HIGH-INDEX OUTER LAYERS

Abstract

An image light guide having a planar waveguide including a transmissive substrate having a first refractive index and at least one outer layer of transmissive material having a second refractive index, wherein the second refractive index is higher than the first refractive index. The transmissive substrate including a front surface and a back surface, wherein the at least one outer layer of a transmissive material is engaged with at least one of the front and back surfaces of the transmissive substrate. The image light guide further including at least one of an in-coupling optic and an out-coupling optic formed in or on the at least one outer layer of transmissive material, wherein the at least one of the in-coupling optic and the out-coupling optic is operable to couple image-bearing light beams into or out of the planar waveguide, respectively.

Claims20

Dependent claims

An image light guide for a near-eye display system, comprising:

a planar waveguide including (a) a transmissive substrate having a first refractive index and (b) at least one outer layer of transmissive material having a second refractive index, wherein the second refractive index is higher than the first refractive index,
wherein the transmissive substrate includes a front surface and a back surface, and
wherein the at least one outer layer of a transmissive material is engaged with at least one of the front and back surfaces of the transmissive substrate;
and
at least one of an in-coupling optic and an out-coupling optic formed in or on the at least one outer layer of transmissive material, wherein the at least one of the in-coupling optic and the out-coupling optic is operable to couple image-bearing light beams into or out of the planar waveguide.

2 more elements

An image light guide for a near-eye display system, comprising:

a planar waveguide,
an in-coupling optic, and
an out-coupling optic, wherein the in-coupling and out-coupling optics, are operable to direct image-bearing light beams into and out of the planar waveguide, respectively;
the planar waveguide including a transmissive substrate having front and back surfaces, at least one intermediate layer of a transmissive material adhered to at least one of the front and back surfaces of the transmissive substrate, and at least one outer layer of a transmissive material adhered to the at least one intermediate layer;
the at least one intermediate layer having a refractive index that matches a refractive index of the transmissive substrate;
and
the at least one outer layer having a refractive index that is greater than the matching refractive index of the at least one intermediate layer and the transmissive substrate.

4 more elements

Dependencies are inferred from the claim text.

Image light guide having high-index outer layers

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Image light guide having high-index outer layers

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Abstract

Claims20