| 摘要 |
An optical projection system which in one implementation reflects illumination from a source off of an electro-optic imaging member in the shape of a plate. The imaging member in the preferred embodiment is an electro-optic ceramic plate, such as PLZT, which is substantially transparent to visible light when not affected by an electric field or electron beam. The imaging member is bonded to the front face-plate of a cathode-ray tube which includes an electron beam generator, a controller for modulatng the intensity of the electron beam with an image and a raster scan generator for scanning the beam across the front face of the tube. At spots where the electron beam strikes the electro-optic plate, the opalescence of the spot is changed in accordance with the scattering effect of the crystal and in dependence upon the intensity of the beam thereby writing a physical nonvolatile image in the imaging member. The imaging member has a transparent electrode on its front face, and an opposing electrode on the back face of the plate. The electrode on the back face of the plate is formed of a multiplicity of strip-like elements which are arranged in substantially parallel rows in the form of a raster. The strip-like elements are mirrored to reflect the illumination of the source and transparent to the electron beam to allow writing of the image in the imaging material. The image formed in areas of the plate is remanent until erased. The application of a voltage between the face electrode and one of the back electrode elements erases the image written by the electron beam scannings for that particular strip.
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