Holographic illumination system
First Claim
1. A method comprising:
- a first electrically switchable holographic optical element (ESHOE) receiving illumination light;
the first ESHOE focusing a first component of the illumination light onto an image display while transmitting the remaining components of the illumination light without substantial alteration;
the image display receiving the focused first component light;
image light emitting from the image display in response to the image display receiving the focused first component;
the first ESHOE receiving and transmitting the image light without substantial alteration.
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Accused Products
Abstract
Disclosed is an apparatus and method of illuminating an image display via an electrically switchable holographic optical element. The method includes a first electrically switchable holographic optical element (ESHOE) receiving illumination light. The first ESHOE comprises oppositely facing front and back surfaces. The first ESHOE focuses a first component (e.g., p-polarized blue light) of the illumination light while transmitting the remaining components of the illumination light without substantial alteration. An image display is provided and receives the focused first component. In response to receiving the focused first component, the image display emits image light. The first ESHOE receives and transmits this image light without substantial alteration. In one embodiment, the focused first component emerges from the first ESHOE at the back surface thereof, and the first ESHOE receives the image light at the back surface.
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Citations
14 Claims
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1. A method comprising:
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a first electrically switchable holographic optical element (ESHOE) receiving illumination light;
the first ESHOE focusing a first component of the illumination light onto an image display while transmitting the remaining components of the illumination light without substantial alteration;
the image display receiving the focused first component light;
image light emitting from the image display in response to the image display receiving the focused first component;
the first ESHOE receiving and transmitting the image light without substantial alteration. - View Dependent Claims (2, 3, 4, 5, 6, 7)
a monomer dipentaerythritol hydroxypentaacrylate;
a liquid crystal;
a cross-linking monomer;
a coinitiator; and
a photoinitiator dye.
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7. The method of claim 1 wherein the first ESHOE comprises a hologram made by exposing an interference pattern inside a polymer-dispersed liquid crystal material, the polymer-dispersed liquid crystal material comprising, before exposure:
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a polymerizable monomer;
a liquid crystal;
a cross-linking monomer;
a coinitiator; and
a photoinitiator dye.
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8. An apparatus comprising:
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a first electrically switchable holographic optical element (ESHOE) for receiving illumination light, wherein the first ESHOE is configured to focus a first component of the illumination light while transmitting the remaining components of the illumination light without substantial alteration;
an image display for receiving the focused first component, wherein the image display is configured to emit image light in response to the image display receiving the focused first component;
wherein the first ESHOE is configured to receive and transmit the image light without substantial alteration. - View Dependent Claims (9, 10, 11, 12, 13, 14)
a monomer dipentaerythritol hydroxypentaacrylate;
a liquid crystal;
a cross-linking monomer;
a coinitiator; and
a photoinitiator dye.
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14. The apparatus of claim 8 wherein the first ESHOE comprises a hologram made by exposing an interference pattern inside a polymer-dispersed liquid crystal material, the polymer-dispersed liquid crystal material comprising, before exposure:
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a polymerizable monomer;
a liquid crystal;
a cross-linking monomer;
a coinitiator; and
a photoinitiator dye.
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Specification