Flat-panel display
First Claim
Patent Images
1. A flat-panel display comprising a projector (2a, 12;
- 21-23) illuminated by a collimated light source such as an infra-red laser (10), a waveguide (1) which ejects rays at a distance along the axis of propagation that is related to their angle of injection into an edge of the waveguide, means (3) for magnifying the projected image in the dimension in the plane of the panel perpendicular to the axis of propagation, and an output screen (7) which converts the collinated light to the visible.
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Abstract
A flat-panel display comprises a projector (21-23) illuminated by a collimate light source such as an infra-red laser, a waveguide (1) which ejects rays at a distance along the axis of propagation related to their angle of injection into the edge of the waveguide, an input slab (3) for magnifying the projected image in the width dimension in the plane of the panel perpendicular to the axis of propagation, and a phosphor output screen which converts the infra-red light to the visible. The use of monochromatic light within the waveguide reduces dispersion problems, and the use of a triad of projectors, each injecting at a different angle, makes registration relatively simple.
176 Citations
16 Claims
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1. A flat-panel display comprising a projector (2a, 12;
- 21-23) illuminated by a collimated light source such as an infra-red laser (10), a waveguide (1) which ejects rays at a distance along the axis of propagation that is related to their angle of injection into an edge of the waveguide, means (3) for magnifying the projected image in the dimension in the plane of the panel perpendicular to the axis of propagation, and an output screen (7) which converts the collinated light to the visible.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A flat-panel display comprising a projector (2a, 12;
- 21-23) illuminated by a collimated light source, a waveguide (1) in the form of a panel having an edge, which ejects rays at a distance along the axis of propagation that is related to their angle of injection into the said edge of the waveguide, means (3) for magnifying the projected image in the dimension in the plane of the panel perpendicular to the axis of propagation, and an output screen (7) which converts the light ejected from the waveguide to visible light.
- View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A flat-panel display comprising:
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a projector (2a, 12;
21-23) including a collimated light source in the form of a laser (10),a panel-shaped ejecting waveguide (1) having an edge into which light is injected from the laser so that it propagates along an axis, while being confined by total internal reflection, and which ejects rays at a distance along the axis of propagation that is related to their angle of injection into the said edge of the waveguide, the ejecting waveguide having an anti-reflection coating tuned to the wavelength of the laser light;
a slab waveguide (3), having the same width as the ejecting waveguide, for magnifying the projected image from the projector in the dimension in the plane of the panel perpendicular to the axis of propagation before it is injected into the ejecting waveguide; and
an output screen (7) in the form of a phosphor sheet on or near one face of the panel-shaped waveguide, which converts the ejected light to the visible.
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Specification