Projection display
First Claim
1. A projection display for displaying an image to a viewer, comprising a curved waveguide made of light transmissive material and having first and second opposed curvilinear surfaces, an image-providing light source device arranged to generate and to inject collimated image bearing light into the waveguide, an input grating coupled to or within the waveguide to diffract said image bearing light to propagate internally along the curved waveguide by total internal reflection, an output grating provided along one of the surfaces of the waveguide by which the image bearing light is diffracted out of the waveguide for viewing by the viewer, wherein the input grating and output grating have variable pitch gratings so that a collimated image injected into the waveguide can be output from the waveguide as a collimated image having an increased exit pupil.
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Accused Products
Abstract
The present invention relates to a projection display (10) for displaying an image to a viewer, comprising a curved waveguide (14) made of light transmissive material and having first and second opposed curvilinear surfaces (26, 28), an image-providing light source device arranged to inject collimated image bearing light into the waveguide, an input grating (20) coupled to or within the waveguide to diffract said image bearing light to propagate internally along the curved waveguide by total internal reflection, an output grating (22) provided along a side of the waveguide by which the image bearing light is diffracted out of the waveguide for viewing by the viewer, wherein the input grating and output grating have variable pitch gratings so that a collimated image injected into the waveguide can be output from the waveguide as a collimated image having an increased exit pupil.
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Citations
12 Claims
- 1. A projection display for displaying an image to a viewer, comprising a curved waveguide made of light transmissive material and having first and second opposed curvilinear surfaces, an image-providing light source device arranged to generate and to inject collimated image bearing light into the waveguide, an input grating coupled to or within the waveguide to diffract said image bearing light to propagate internally along the curved waveguide by total internal reflection, an output grating provided along one of the surfaces of the waveguide by which the image bearing light is diffracted out of the waveguide for viewing by the viewer, wherein the input grating and output grating have variable pitch gratings so that a collimated image injected into the waveguide can be output from the waveguide as a collimated image having an increased exit pupil.
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11. A head mounted display, a helmet mounted display, pair of goggles, or spectacles comprising a projection display for displaying an image to a viewer, comprising a curved waveguide made of light transmissive material and having first and second opposed curvilinear surfaces, an image-providing light source device arranged to generate and to inject collimated image bearing light into the waveguide, an input grating coupled to or within the waveguide to diffract said image bearing light to propagate internally along the curved waveguide by total internal reflection, an output grating provided along one of the surfaces of the waveguide by which the image bearing light is diffracted out of the waveguide for viewing by the viewer, wherein the input grating and output grating have variable pitch gratings so that a collimated image injected into the waveguide can be output from the waveguide as a collimated image having an increased exit pupil.
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12. A visor for displaying an image to a viewer, comprising a curved visor made of light transmissive material and having first and second opposed curvilinear surfaces to form a waveguide section, an image-providing light source device arranged to generate and to inject collimated image bearing light into the waveguide section of the visor, an input grating coupled to or within the visor to diffract said image bearing light to propagate internally along the visor within the waveguide section by total internal reflection, an output grating provided along one of the surfaces of the visor by which the image bearing light is diffracted out of the visor for viewing by the viewer, wherein the input grating and output grating have variable pitch gratings so that a collimated image injected into the visor can be output from the visor as a collimated image having an increased exit pupil.
Specification