Display apparatus and method therefor
First Claim
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1. A method of converting an electrical signal into a visual display, said method comprising:
- generating a beam of light;
modulating said beam by said electrical signal to produce a modulated beam;
optically masking said modulated beam by an optical mask to produce a masked modulated beam;
impinging said masked modulated beam at a two dimension photocathode screen in an evacuated envelope;
releasing electrons from said photocathode screen in response to said masked modulated beam;
accelerating said electrons to a two dimension phosphor screen in said envelope, said phosphor screen defining a plurality of pixels;
releasing visible light from said phosphor screen in response to electrons impinging thereon; and
moving said modulated beam causing said masked modulated beam to impinging said photocathode screen in different locations;
whereby said masked means reduces cross-talk between adjacent pixels and the movement of said masked modulated beam forms said visual display on said phosphor screen.
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Abstract
A method and an apparatus is disclosed for converting a video signal to a visual display on a device (10). The device (10) comprises an electromagnetic beam generator (12). An electro-optic modulator (14) modulates the beam (11) in response to the video signal. The beam (11) is focused and delivered to impinge a photocathode screen (36) in an evacuated envelope (30). Within the envelope (30), spaced apart from the photocathode screen (36) is a phosphor screen (38). The photoelectrons released from the photocathode (36) are accelerated and directed to impinge the phosphor screen (38).
19 Citations
36 Claims
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1. A method of converting an electrical signal into a visual display, said method comprising:
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generating a beam of light; modulating said beam by said electrical signal to produce a modulated beam; optically masking said modulated beam by an optical mask to produce a masked modulated beam; impinging said masked modulated beam at a two dimension photocathode screen in an evacuated envelope; releasing electrons from said photocathode screen in response to said masked modulated beam; accelerating said electrons to a two dimension phosphor screen in said envelope, said phosphor screen defining a plurality of pixels; releasing visible light from said phosphor screen in response to electrons impinging thereon; and moving said modulated beam causing said masked modulated beam to impinging said photocathode screen in different locations; whereby said masked means reduces cross-talk between adjacent pixels and the movement of said masked modulated beam forms said visual display on said phosphor screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for converting an electrical signal into a visual display, said apparatus comprising:
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means for generating a beam of light; means for modulating said beam by said electrical signal; an optical mask for optically masking said modulated beam forming a masked modulated beam; an evacuated envelope comprising; a photocathode screen for releasing electrons in response to light impinging thereon; a phosphor screen positioned spaced apart from said photocathode screen for releasing visible light in response to electrons impinging thereon, said phosphor screen defining a plurality of pixels; means for accelerating the electrons from said photocathode screen to said phosphor screen; and means for moving said modulated beam causing said masked modulated beam to impinge said photocathode screen in different locations; whereby said mask means reduces cross-talk between adjacent pixels and the movement of said masked modulated beam forms said visual display on said phosphor screen. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An apparatus for converting an electrical signal into a visual display, said apparatus comprising:
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means for generating a beam of light; means for modulating said beam by said electrical signal; an optical mask for optically masking said modulated beam forming a masked modulated beam; an evacuated envelope comprising; a photocathode screen for releasing electrons in response to light impinging thereon; a phosphor screen positioned spaced apart from said photocathode screen for releasing visible light in response to electrons impinging thereon, said phosphor screen defining a plurality of pixels; means for accelerating the electrons from said photocathode screen to said phosphor screen; and means for moving said beam causing said masked modulated beam to impinge said photocathode screen in different locations; whereby said mask means reduces cross-talk between adjacent pixels and the movement of said masked modulated beam forms said visual display on said phosphor screen.
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Specification