Optical screens
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A cathode ray tube has an optical screen formed of a series of strips aligned with the writing direction of the cathode ray tube raster. The strips each comprise a layer of electro-optical material, and are electrically interconnected with the cathode ray tube circuitry so that each strip is transparent when the raster is writing on a cathode ray tube display face behind it. The electro-optical material is preferably a liquid crystal material.
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Citations
13 Claims
- 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.
Specification