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Optical screens

  • US 4,231,068 A
  • Filed: 06/12/1978
  • Issued: 10/28/1980
  • Est. Priority Date: 06/15/1977
  • Status: Expired due to Term
First Claim
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1. An optical screen for use with a cathode ray tube having a display face and a raster, comprising a series of parallel strips aligned with the writing direction of said raster, each of said parallel strips comprising a layer of electro-optical substance, and means for sequentially varying a voltage applied across said strips so that each strip is transparent when said raster is writing behind it and becomes light absorbent when said raster is not writing behind it.

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