Achromatic flat-panel camera

摘要

An achromatic flat-panel projection display comprises a video projector 2 a, 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.