Display system with rapid color switching
AssigneeRaytheon Company
InventorHarold M. Hart
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Abstract
An improved color display system employing a beam penetration type cathode-ray tube with rapid color switching. The screen electrode is separated from the accelerating electrodes without the use of an isolating mesh so that the voltage applied to the screen electrode is switched across only a relatively small capacitance. The invention may be used in conjunction with either magnetic or electrostatic deflection beam penetration cathode-ray tubes as well as either magnetic or electrostatic focus tubes. Such display systems may be used for radar type random access or scanned raster type displays.
Claims6
A cathode-ray tube comprising in combination:
- an envelope, said envelope having a neck portion, an accelerating portion, said screen portion comprising beam penetration phosphor layers and a screen portion;
- an electron gun for producing a beam of electrons, said electron gun being located in said neck portion and said beam of electrons being directed toward said screen portion;
- a phosphor screen layer, said phosphor screen layer being disposed upon said screen portion of said envelope, the color of light emitted from said screen being dependent upon the velocity of electrons striking said screen layer;
- a conductive layer, said conductive layer being contiguous to said phosphor screen layer;
- a first accelerating electrode, said first accelerating electrode being disposed upon a first section of said accelerating portion of said envelope adjacent said neck portion and outside the region traversed by said beam;
- and
- a second accelerating electrode, said second accelerating electrode being disposed upon a second section of said accelerating portion of said envelope adjacent said screen portion and coupled to said conductive layer, there being a gap between said first and second accelerating electrodes upon said accelerating portion of said envelope, the color of light emitted from said phosphor screen layer being determined by a voltage applied to said second accelerating electrode, the width of said gap being less than the distance from said electron beam at the nearest approach of said electron beam to said gap and being sufficiently great that substantially no pattern distortion is effected upon changing the magnitude of a voltage applied to said second accelerating electrode.
Dependencies are inferred from the claim text.