Color separation in planar waveguides using dichroic filters
First Claim
1. An eyepiece for projecting an image to an eye of a viewer, the eyepiece comprising:
- a first planar waveguide positioned in a first lateral plane, wherein the first waveguide comprises a first diffractive optical element (DOE) coupled thereto and disposed at a lateral position, the first DOE configured to diffract image light in a first wavelength range centered at a first wavelength;
a second planar waveguide positioned in a second lateral plane adjacent the first lateral plane, wherein the second waveguide comprises a second DOE coupled thereto and disposed at the lateral position, the second DOE configured to diffract image light in a second wavelength range centered at a second wavelength longer than the first wavelength;
a third planar waveguide positioned in a third lateral plane adjacent the second lateral plane, wherein the third waveguide comprises a third DOE coupled thereto and disposed at the lateral position, the third DOE configured to diffract image light in a third wavelength range centered at a third wavelength longer than the second wavelength;
a first optical filter disposed between the first waveguide and the second waveguide at the lateral position, wherein the first optical filter is configured to have;
a first transmittance value at the first wavelength range;
a second transmittance value at the second wavelength range and the third wavelength range that is greater than the first transmittance value; and
a first reflectance value at the first wavelength range that is greater than about 90%; and
a second optical filter positioned between the second waveguide and the third waveguide at the lateral position, wherein the second optical filter is configured to have;
a third transmittance value at the first wavelength range and the second wavelength range;
a fourth transmittance value at the third wavelength range that is greater than the third transmittance value; and
a second reflectance value at the second wavelength range that is greater than about 90%.
3 Assignments
0 Petitions
Accused Products
Abstract
An eyepiece for projecting an image to an eye of a viewer includes a first planar waveguide positioned in a first lateral plane, a second planar waveguide positioned in a second lateral plane adjacent the first lateral plane, and a third planar waveguide positioned in a third lateral plane adjacent the second lateral plane. The first waveguide includes a first diffractive optical element (DOE) coupled thereto and disposed at a lateral position. The second waveguide includes a second DOE coupled thereto and disposed at the lateral position. The third waveguide includes a third DOE coupled thereto and disposed at the lateral position. The eyepiece further includes a first optical filter disposed between the first waveguide and the second waveguide at the lateral position, and a second optical filter positioned between the second waveguide and the third waveguide at the lateral position.
133 Citations
10 Claims
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1. An eyepiece for projecting an image to an eye of a viewer, the eyepiece comprising:
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a first planar waveguide positioned in a first lateral plane, wherein the first waveguide comprises a first diffractive optical element (DOE) coupled thereto and disposed at a lateral position, the first DOE configured to diffract image light in a first wavelength range centered at a first wavelength; a second planar waveguide positioned in a second lateral plane adjacent the first lateral plane, wherein the second waveguide comprises a second DOE coupled thereto and disposed at the lateral position, the second DOE configured to diffract image light in a second wavelength range centered at a second wavelength longer than the first wavelength; a third planar waveguide positioned in a third lateral plane adjacent the second lateral plane, wherein the third waveguide comprises a third DOE coupled thereto and disposed at the lateral position, the third DOE configured to diffract image light in a third wavelength range centered at a third wavelength longer than the second wavelength; a first optical filter disposed between the first waveguide and the second waveguide at the lateral position, wherein the first optical filter is configured to have; a first transmittance value at the first wavelength range; a second transmittance value at the second wavelength range and the third wavelength range that is greater than the first transmittance value; and a first reflectance value at the first wavelength range that is greater than about 90%; and a second optical filter positioned between the second waveguide and the third waveguide at the lateral position, wherein the second optical filter is configured to have; a third transmittance value at the first wavelength range and the second wavelength range; a fourth transmittance value at the third wavelength range that is greater than the third transmittance value; and a second reflectance value at the second wavelength range that is greater than about 90%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification