Eidophor
Encyclopedia : E : EI : EID : Eidophor
An Eidophor was a television projector used to create theatre-sized images. Its basic technology was the use of electrostatic charges to deform an oil surface.
Developed by the Swiss Federal Institute of Technology and Dr. Edgar Gretener A.G., Eidophors used an optical system somewhat similar to a conventional movie projector but substituted a slowly-rotating disk or dish for the film. The disk was covered with a thick oil and through the use of a scanned electron beam, electrostatic charges could be deposited onto the oil, causing the surface of the oil to deform. These deformations were then converted to light and dark areas by the optical system. As the disk rotated, a doctor blade discharged and smoothed the ripples in the oil, readying it for re-use on another television frame.
Simple Eidophors produced black-and-white images. More complex Eidophors produced sequential red, green, and blue fields, allowing the reproduction of a color image.
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