Achromatic flat-panel display
AssigneeCambridge Flat Projection Displays Limited
InventorAdrian Robert Leigh Travis
Life of this patent
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Abstract
An achromatic flat-panel projection display comprises a video projector 2a, a condensing lens (26) and a tapered transparent slab spreading the image input from the projector over the area of th slab. To compensate for dispersion in the slab a dispersive prism is used at the input edge of the slab, whose dispersion cancels out the dispersion of the slab. The prism can be a separate part of simply a bevel in the input edge, i.e. the thick end of the slab.
Claims5
An achromatic flat-panel projection display comprising an image projector for projecting an image to be displayed, and a tapered transparent slab into the thick end of which the image is projected so that the rays emerge over one face of the slab, the slab being made of a dispersive material;
- further comprising a dispersive prism between the projector and the slab, compensating for the dispersion occurring in the slab.
Dependencies are inferred from the claim text.