Color distribution in exit pupil expanders
First Claim
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1. An apparatus, comprising:
- a substrate of optical material having a first surface and a second surface;
at least one diffractive element disposed on the first or the second surface of said substrate and configured to receive an input optical beam;
at least one further diffractive element disposed on the first or the second surface; and
at least one optically absorbing area within said substrate, whereinthe at least one diffractive element is configured to diffract at least part of the input optical beam to provide at least one diffracted optical beam substantially within the first and the second surfaces, andsaid at least one further diffractive element is configured to diffract at least part of the at least one diffracted optical beam such that at least part of the at least one diffracted optical beam is coupled out of the substrate, thus said at least one further diffractive element is configured to provide an output optical beam out of said substrate with an expanded exit pupil in one or two dimensions, whereinsaid input optical beam comprises K wavelength components and said at least one optically absorbing area is configured to absorb M pre-selected components out of the K wavelength components of said at least one diffracted optical beam and to propagate a selected component out of the K wavelength components of said at least one diffracted optical beam, such that the output optical beam comprises said selected component out of the K wavelength components, wherein K is an integer of at least a value of two and M is an integer between 1 and K−
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Abstract
The specification and drawings present a new apparatus and method for providing color separation in an exit pupil expander system that uses a plurality of diffractive elements for expanding the exit pupil of a display in an electronic device for viewing by introducing a selectively absorbing area or areas in the exit pupil expander.
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Citations
21 Claims
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1. An apparatus, comprising:
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a substrate of optical material having a first surface and a second surface; at least one diffractive element disposed on the first or the second surface of said substrate and configured to receive an input optical beam; at least one further diffractive element disposed on the first or the second surface; and at least one optically absorbing area within said substrate, wherein the at least one diffractive element is configured to diffract at least part of the input optical beam to provide at least one diffracted optical beam substantially within the first and the second surfaces, and said at least one further diffractive element is configured to diffract at least part of the at least one diffracted optical beam such that at least part of the at least one diffracted optical beam is coupled out of the substrate, thus said at least one further diffractive element is configured to provide an output optical beam out of said substrate with an expanded exit pupil in one or two dimensions, wherein said input optical beam comprises K wavelength components and said at least one optically absorbing area is configured to absorb M pre-selected components out of the K wavelength components of said at least one diffracted optical beam and to propagate a selected component out of the K wavelength components of said at least one diffracted optical beam, such that the output optical beam comprises said selected component out of the K wavelength components, wherein K is an integer of at least a value of two and M is an integer between 1 and K−
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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receiving an input optical beam by at least one diffractive element disposed on a first or a second surface of a substrate, said input optical beam comprises K wavelength components, wherein K is an integer of at least a value of two; diffracting at least part of the input optical beam in the at least one diffractive element to provide at least one diffracted optical beam substantially within the first and second surfaces; absorbing M pre-selected components out of the K wavelength components of said at least one diffracted optical beam in at least one optically absorbing area within said substrate and propagating a selected component out of the K wavelength components of said at least one diffracted optical beam, wherein M is an integer between 1 and K−
1; andcoupling at least part of the at least one diffracted optical beam out of the substrate by diffraction in said at least one further diffractive element, thus providing an output optical beam out of said substrate with an expanded exit pupil in one or two dimensions, wherein the output optical beam comprises said selected component out of the K wavelength components. - View Dependent Claims (18, 19)
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20. An apparatus, comprising:
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at least one means for diffraction, for receiving an input optical beam by at least one means for diffraction disposed on a first or a second surface of a substrate, said input optical beam comprises K wavelength components, wherein K is an integer of at least a value of two, and for diffracting at least part of the input optical beam in the at least one means for diffraction to provide at least one diffracted optical beam substantially within the first and second surfaces; at least one absorbing means within said substrate, for absorbing M pre-selected components out of the K wavelength components of said at least one diffracted optical beam by said at least one absorbing means and propagating a selected component out of the K wavelength components of said at least one diffracted optical beam, wherein M is an integer between 1 and K−
1; andat least one further means for diffraction, for coupling at least part of the at least one diffracted optical beam out of the substrate by diffraction in said at least one further means for diffraction, thus providing an output optical beam out of said substrate with an expanded exit pupil in one or two dimensions, wherein the output optical beam comprises said selected component out of the K wavelength components. - View Dependent Claims (21)
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Specification