Reflector and cover glass for substrate guided HUD
First Claim
Patent Images
1. A head up display comprising:
- a substrate waveguide, configured for use as a combiner, the substrate waveguide receiving collimated light at an input and providing the collimated light to an output, the collimated light traveling from the input to the output within the substrate waveguide by total internal reflection, wherein an input diffraction grating is disposed in a first area at the input and an output diffraction grating is disposed in a second area at the output; and
a plate covering at least a portion of the second area, wherein the output diffraction grating is disposed parallel to a face of the substrate waveguide at the second area, wherein the plate is disposed parallel to the output diffraction grating.
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Abstract
A display (for example, a head up display (HUD)) includes a substrate waveguide. The substrate waveguide can act as a combiner. The substrate waveguide receives collimated light an input and provides the collimated light to an output. The collimated light travels from the input to the output within the substrate waveguide by total internal reflection. An input diffraction grating is disposed in the first area at the input and an output diffraction grating is disposed in the second area at the output. A plate covers at least a portion of the second area. The plate can protect the diffraction grating and reflect transmitted order light from the diffraction grating to improve efficiency.
132 Citations
20 Claims
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1. A head up display comprising:
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a substrate waveguide, configured for use as a combiner, the substrate waveguide receiving collimated light at an input and providing the collimated light to an output, the collimated light traveling from the input to the output within the substrate waveguide by total internal reflection, wherein an input diffraction grating is disposed in a first area at the input and an output diffraction grating is disposed in a second area at the output; and a plate covering at least a portion of the second area, wherein the output diffraction grating is disposed parallel to a face of the substrate waveguide at the second area, wherein the plate is disposed parallel to the output diffraction grating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of providing information to a user, the method comprising:
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providing light from an image source to a collimator; providing the light from the collimator to a combiner, the light traveling from an input of the combiner to an output of the combiner by total internal reflection, wherein an input diffraction grating is disposed in a first area at the input and an output diffraction grating is disposed in a second area at the output; and reflecting light transmitted through the output diffraction grating to a position outside of the combiner with a component protecting the output diffraction grating, wherein the light transmitted through the output diffraction grating to the position is reflected through the combiner toward the user, wherein the output grating is disposed parallel to a main surface of the combiner. - View Dependent Claims (11, 12, 13, 14)
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15. A display for providing an image, the display comprising:
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an image source; collimating optics for receiving the image from the image source; a combiner receiving collimated light from the collimating optics at an input and providing the collimated light to an output, the collimated light traveling from the input to the output within the combiner by total internal reflection, wherein an input diffraction grating is disposed at the input and an output diffraction grating is disposed at the output, wherein the output diffraction grating is disposed parallel to a main surface of the combiner associated with the output; and a means for recovering transmitted order light from the output diffraction grating and protecting the output diffraction grating. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification