WAVEGUIDES
First Claim
Patent Images
1. A projection display, for displaying an image to an observer, including:
- a first waveguide element arranged to be light transmissive;
an image-providing light source device arranged to generate an image and to inject image bearing light into the first waveguide element;
a first grating associated with the first waveguide element arranged to direct the image bearing light internally along the first waveguide element under total internal reflection and via which the image bearing light is outputted from the first waveguide element;
a second waveguide element arranged to be light transmissive and transparent that includes a second grating arranged to receive the image bearing light from the first waveguide element and to direct the image bearing light along the second waveguide element under total internal reflection;
the second waveguide element further includes a third grating arranged to diffract received image bearing light out of the second waveguide element towards an observer; and
wherein an optical element associated with each waveguide element is arranged to disperse incident image bearing light such that each discrete point in the field of view of the image to be viewed by the observer occupies a continuum of angles within the first and second waveguide elements.
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Accused Products
Abstract
An image-providing light source device 58 is arranged to inject a non-coherent and collimated image into waveguide element 60. Light forming the image is dispersed by an optical element 76 so as to occupy a continuum of angles within the waveguide 60. The optical element 76 and a grating 70 are arranged such that the light exiting the waveguide occupies a single angle. Thereby, pupil banding of light exiting the waveguide 60 is mitigated.
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Citations
15 Claims
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1. A projection display, for displaying an image to an observer, including:
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a first waveguide element arranged to be light transmissive; an image-providing light source device arranged to generate an image and to inject image bearing light into the first waveguide element; a first grating associated with the first waveguide element arranged to direct the image bearing light internally along the first waveguide element under total internal reflection and via which the image bearing light is outputted from the first waveguide element; a second waveguide element arranged to be light transmissive and transparent that includes a second grating arranged to receive the image bearing light from the first waveguide element and to direct the image bearing light along the second waveguide element under total internal reflection; the second waveguide element further includes a third grating arranged to diffract received image bearing light out of the second waveguide element towards an observer; and wherein an optical element associated with each waveguide element is arranged to disperse incident image bearing light such that each discrete point in the field of view of the image to be viewed by the observer occupies a continuum of angles within the first and second waveguide elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13)
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11. A waveguide, including:
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a substrate of material; a grating arranged to diffract a portion of image bearing light incident thereon out of the substrate of material and to allow the remainder of the image bearing light incident thereon to be transmitted within the substrate of material under total internal reflection; and an optical element arranged to receive and disperse image bearing light such that each discrete point in the field of view of an image to be transmitted by the substrate of material under total internal reflection occupies a continuum of angles within the substrate of material. - View Dependent Claims (12, 14)
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15-16. -16. (canceled)
Specification