US 6,476,545 B1Granted

Asymmetric, gradient-potential, space-savings cathode ray tube

AssigneeSarnoff Corporation

InventorsJoseph Michael Carpinelli, Dennis John Bechis, George Herbert Needham Riddle, David Arthur New, John Richard Fields

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Abstract

A cathode ray tube includes an electron gun directing electrons away from a faceplate having an electrode biased at screen potential. A plurality of electrodes located on or near the rear wall of the tube envelope are biased at graduated potentials so that the electron beam is deflected by the electrostatic field produced thereby to impinge upon the faceplate. The electron beam is magnetically deflected over a relatively small angle as it exits the electron gun to scan across the faceplate to impinge upon phosphors thereon to produce light depicting an image or information. The electrodes may be biased at or below screen potential, with the electrode closest the electron gun typically biased at a negative or ground potential and the electrode closest the faceplate (i.e. distal the electron gun) typically biased below screen potential to direct electrons towards the faceplate, thereby to increase the landing angle thereof.

Claims30

Dependent claims

A tube comprising:

a tube envelope having a faceplate and a screen electrode on the faceplate biased at a screen potential;
a source of plural beams of electrons directed away from said faceplate, wherein said source is adapted for scanning deflection of said plural beams of electrons;
a shadow mask proximate said faceplate having a plurality of apertures therethrough, wherein said shadow mask is biased at the screen potential;
phosphorescent material disposed on said faceplate for producing light in response to the plural beams of electrons impinging thereon, wherein said phosphorescent material includes a pattern of different phosphorescent materials on said faceplate that emit different color light in response to the plural beams of electrons impinging thereon through the apertures of said shadow mask;
and
at least first and second electrodes interior said tube envelope and spaced away from said faceplate for bending the plural beams of electrons towards said faceplate, wherein said first electrode is relatively proximate said source in a direction generally parallel said faceplate and said second electrode is relatively distal said source in a direction generally parallel said faceplate, thereby defining a volume between said faceplate and said electrodes in which the plural beams of electrons may be bent, wherein said first electrode is biased at a potential substantially less than the screen potential, and wherein said second electrode is biased at a potential one of less than and greater than the screen potential.

3 more elements

A cathode ray tube comprising:

a tube envelope having a generally flat faceplate and a screen electrode on the faceplate biased at a positive screen potential, and having a tube neck positioned proximate one edge of said faceplate;
in said tube neck, a source of at least one beam of electrons directed away from said faceplate, wherein said source is for scanning deflection of said at least one beam of electrons;
a deflection yoke around said source of a beam of electrons for deflecting the beam of electrons from said source over a predetermined range of deflection angles;
phosphorescent material disposed on said faceplate for producing light in response to the beam of electrons impinging thereon;
and
at least first, second and third deflection electrodes spaced apart from said faceplate within said tube envelope for deflecting the beam of electrons towards said faceplate and defining a volume within which the beam of electrons may be so deflected, wherein said first electrode is proximate said source in a direction generally parallel said faceplate and biased at a potential less than the screen potential, wherein said third electrode is distal said source in a direction generally parallel said faceplate and is biased at a positive potential less than the screen potential, wherein said second electrode is between said first electrode and said third electrode in a direction generally parallel said faceplate and is biased at a potential more positive than the bias potential of the second electrode and not exceeding the screen potential,
whereby the deflected beam of electrons are deflected by at least one of said first, second and third electrodes to impinge on a substantial area of said screen electrode and said faceplate.

4 more elements

A cathode ray tube comprising:

a tube envelope having a generally flat faceplate and a screen electrode on the faceplate biased at a screen potential, and having a tube neck positioned proximate one edge of said faceplate;
in said tube neck, a source of at least one beam of electrons directed away from said faceplate, wherein said source is for scanning deflection of said at least one beam of electrons;
a deflection yoke around said source of a beam of electrons for deflecting the beam of electrons from said source over a predetermined range of deflection angles;
phosphorescent material disposed on said faceplate for producing light in response to the beam of electrons impinging thereon;
a shadow mask proximate said faceplate having a plurality of apertures therethrough, wherein said shadow mask is biased at said screen potential, and
wherein said phosphorescent material includes a pattern of different phosphorescent materials that emit different respective colors of light in response to said beam of electrons impinging thereon;
at least first, second and third deflection electrodes spaced apart from said faceplate within said tube envelope for deflecting the beam of electrons towards said faceplate and defining a volume within which the beam of electrons may be so deflected, wherein said first electrode is proximate said source in a direction generally parallel said faceplate and is biased at a potential less than the screen potential, wherein said third electrode is distal said source in a direction generally parallel said faceplate and is biased at a potential less than the screen potential, wherein said second electrode is between said first electrode and said third electrode in a direction generally parallel said faceplate and is biased at a potential not exceeding the screen potential,
whereby the deflected beam of electrons are deflected by at least one of said first, second and third electrodes to impinge on a substantial area of said screen electrode and said faceplate.

5 more elements

A display comprising:

a faceplate having a near edge and a far edge,
a screen electrode on said faceplate biased at a positive screen potential, and
phosphorescent material disposed on said faceplate for producing light in response to a beam of electrons impinging thereon;
a tube envelope joined to said faceplate at least at the near and far edges thereof,
wherein the joined tube envelope and faceplate define a tube volume therebetween,
a source of at least one beam of electrons disposed proximate the near edge of said faceplate,
wherein said at least one beam of electrons is directed into the tube volume in a direction away from said faceplate,
deflection neans for scanning deflection of the at least one beam of electrons within the tube volume,
whereby said deflection means provides at least one scanning deflected beam of electrons directed into the tube volume;
a first electrode within the tube volume on said tube envelope relatively proximate the near edge of said faceplate,
wherein said first electrode is biased at a first potential substantially less than the screen potential for establishing an electrostatic field within the tube volume relatively proximal the near edge of said faceplate for urging the at least one scanning deflected beam of electrons within the tube volume towards said faceplate,
a second electrode within the tube volume on said tube envelope relatively distal the near edge of said faceplate,
wherein said second electrode is biased at a second potential that is more positive than the bias potential of said first electrode and is one of less than and greater than the screen potential for establishing an electrostatic field within the tube volume relatively distal the near edge of said faceplate for urging the at least one scanning deflected beam of electrons within the tube volume one of towards and away from said faceplate;
and
a source of the first second and screen potentials.

12 more elements

A display comprising:

a faceplate having a near edge and a far edge,
a screen electrode on said faceplate biased at a screen potential, and
phosphorescent material disposed on said faceplate for producing light in response to a beam of electrons impinging thereon;
a tube envelope joined to said faceplate at least at the near and far edges thereof,
wherein the joined tube envelope and faceplate define a tube volume therebetween,
a source of plural beams of electrons disposed proximate the near edge of said faceplate,
wherein said plural beams of electrons are directed into the tube volume in a direction away from said faceplate,
deflection means for scanning deflection of the plural beams of electrons within the tube volume,
whereby said deflection means provides plural scanning deflected beams of electrons directed into the tube volume;
a shadow mask proximate said faceplate having a plurality of apertures therethrough, wherein said shadow mask is biased at the screen potential, and
wherein said phosphorescent material includes a pattern of different phosphorescent materials on said faceplate that emit different color light in response to the plural beams of electrons impinging thereon through the apertures of said shadow mask;
a first electrode within the tube volume on said tube envelope relatively proximate the near edge of said faceplate,
wherein said first electrode is biased at a first potential substantially less than the screen potential for establishing an electrostatic field within the tube volume relatively proximal the near edge of said faceplate for urging the plural scanning deflected beams of electrons within the tube volume towards said faceplate,
a second electrode within the tube volume on said tube envelope relatively distal the near edge of said faceplate,
wherein said second electrode is biased at a second potential one of less than and greater than the screen potential for establishing an electrostatic field within the tube volume relatively distal the near edge of said faceplate for urging the plural scanning deflected beams of electrons within the tube volume one of towards and away from said faceplate;
and
a source of the first second and screen potentials.

14 more elements

A display comprising:

a faceplate having a near edge and a far edge,
a screen electrode on said faceplate adapted to be biased at a screen potential, and
phosphorescent material disposed on said faceplate for producing light in response to a beam of electrons impinging thereon;
a tube envelope joined to said faceplate at least at the near and far edges thereof,
wherein the joined tube envelope and faceplate define a tube volume therebetween,
a source of at least one beam of electrons disposed proximate the near edge of said faceplate,
wherein said at least one beam of electrons is directed into the tube volume in a direction away from said faceplate,
deflection means for scanning deflection of the at least one beam of electrons within the tube volume,
whereby said deflection means provides at least one scanning deflected beam of electrons directed into the tube volume;
a first electrode within the tube volume on said tube envelope relatively proximate the near edge of said faceplate,
wherein said first electrode is biased at a first potential substantially less than the screen potential for establishing an electrostatic field within the tube volume relatively proximal the near edge of said faceplate for urging the at least one scanning deflected beam of electrons within the tube volume towards said faceplate,
a second electrode within the tube volume on said tube envelope relatively distal the near edge of said faceplate,
wherein said second electrode is biased at a second potential one of less than and greater than the screen potential for establishing an electrostatic field within the tube volume relatively distal the near edge of said faceplate for urging the at least one scanning deflected beam of electrons within the tube volume one of towards and away from said faceplate;
a source of the first, second and screen potentials;
and
a third electrode within the tube volume on said tube envelope for urging the beam of electrons towards said faceplate,
wherein said third electrode is biased at a third potential less than the screen potential,
wherein said third electrode is more distal the near edge of said faceplate than is said second electrode,
whereby said third electrode is on said tube envelope between said second electrode and the far edge of said faceplate.

16 more elements

A display comprising:

a faceplate having a near edge and a far edge,
a screen electrode on said faceplate biased at a screen potential, and
phosphorescent material disposed on said faceplate for producing light in response to a beam of electrons impinging thereon;
a tube envelope joined to said faceplate at least at the near and far edges thereof,
wherein the joined tube envelope and faceplate define a tube volume therebetween;
a source of at least one beam of electrons disposed proximate the near edge of said faceplate,
wherein said at least one beam of electrons is directed into the tube volume in a direction away from said faceplate,
deflection means for scanning deflection of the at least one beam of electrons within the tube volume,
whereby said deflection means provides at least one scanning deflected beam of electrons directed into the tube volume;
a first electrode within the tube volume on said tube envelope relatively proximate the near edge of said faceplate,
wherein said first electrode is biased at a first potential substantially less than the screen potential for establishing an electrostatic field within the tube volume relatively proximal the near edge of said faceplate for urging the at least one scanning deflected beam of electrons within the tube volume towards said faceplate,
a second electrode within the tube volume on said tube envelope relatively distal the near edge of said faceplate,
wherein said second electrode is biased at a second potential one of less than and greater than the screen potential for establishing an electrostatic field within the tube volume relatively distal the near edge of said faceplate for urging the at least one scanning deflected beam of electrons within the tube volume one of towards and away from said faceplate;
and
a source of the first, second and screen potentials;
wherein at least one of said first and second electrodes includes a plurality of sub-electrodes adapted to be biased at different potentials,
wherein at least one of said sub-electrodes is biased at a potential more positive than the screen potential.

14 more elements

A tube comprising:

a faceplate having a near edge and a far edge,
a screen electrode on said faceplate biased at a screen potential, and
phosphorescent material disposed on said faceplate for producing light in response to a beam of electrons impinging thereon;
a tube envelope joined to said faceplate at least at the near and far edges thereof,
wherein the joined tube envelope and faceplate define a tube volume therebetween,
a source of at least one beam of electrons disposed proximate the near edge of said faceplate,
wherein said at least one beam of electrons is directed into the tube volume in a direction away from said faceplate,
wherein said source is for scanning deflection of said at least one beam of electrons in a deflection region proximate an exit thereof;
a first electrode within the tube volume on said tube envelope relatively proximate the near edge of said faceplate,
wherein said first electrode is biased at a potential substantially less than the screen potential for establishing an electrostatic field within said tube volume relatively proximal the near edge of said faceplate for urging the beam of electrons within the tube volume towards said faceplate, and
a second electrode within the tube volume on said tube envelope relatively distal the near edge of said faceplate,
wherein said second electrode is biased at a potential that is closer in potential to the screen potential than is the bias potential of said first electrode and is one of less than and greater than the screen potential for establishing an electrostatic field within the tube volume relatively distal the near edge of said faceplate for urging the beam of electrons within the tube volume one of towards and away from said faceplate.

9 more elements

A tube comprising:

a faceplate having a near edge and a far edge,
a screen electrode on said faceplate biased at a screen potential, and
phosphorescent material disposed on said faceplate for producing light in response to a beam of electrons impinging thereon;
a tube envelope joined to said faceplate at least at the near and far edges thereof,
wherein the joined tube envelope and faceplate define a tube volume therebetween,
a source of at least one beam of electrons disposed proximate the near edge of said faceplate,
wherein said at least one beam of electrons is directed into the tube volume in a direction away from said faceplate,
wherein said source is for scanning deflection of said at least one beam of electrons in a deflection region proximate an exit thereof;
a shadow mask proximate said faceplate having a plurality of apertures therethrough, wherein said shadow mask is biased at the screen potential, and
wherein said phosphorescent material includes a pattern of different phosphorescent materials on said faceplate that emit different color light in response to the beam of electrons impinging thereon through the apertures of said shadow mask;
a first electrode within the tube volume on said tube envelope relatively proximate the near edge of said faceplate,
wherein said first electrode is biased at a potential substantially less than the screen potential for establishing an electrostatic field within said tube volume relatively proximal the near edge of said faceplate for urging the beam of electrons within the tube volume towards said faceplate, and
a second electrode within the tube volume on said tube envelope relatively distal the near edge of said faceplate,
wherein said second electrode is biased at a potential one of less than and greater than the screen potential for establishing an electrostatic field within the tube volume relatively distal the near edge of said faceplate for urging the beam of electrons within the tube volume one of towards and away from said faceplate.

11 more elements

A tube comprising:

a faceplate having a near edge and a far edge,
a screen electrode on said faceplate biased at a screen potential, and
phosphorescent material disposed on said faceplate for producing light in response to a beam of electrons impinging thereon;
a tube envelope joined to said faceplate at least at the near and far edges thereof,
wherein the joined tube envelope and faceplate define a tube volume therebetween,
a source of at least one beam of electrons disposed proximate the near edge of said faceplate,
wherein said at least one beam of electrons is directed into the tube volume in a direction away from said faceplate,
wherein said source is for scanning deflection of said at least one beam of electrons in a deflection region proximate an exit thereof;
a first electrode within the tube volume on said tube envelope relatively proximate the near edge of said faceplate,
wherein said first electrode is to be biased at a potential substantially less than the screen potential for establishing an electrostatic field within said tube volume relatively proximal the near edge of said faceplate for urging the beam of electrons within the tube volume towards said faceplate,
a second electrode within the tube volume on said tube envelope relatively distal the near edge of said faceplate,
wherein said second electrode is biased at a potential one of less than and greater than the screen potential for establishing an electrostatic field within the tube volume relatively distal the near edge of said faceplate for urging the beam of electrons within the tube volume one of towards and away from said faceplate;
and
a third electrode within the tube volume on said tube envelope for urging the beam of electrons towards said faceplate,
wherein said third electrode is biased at a third potential less than the screen potential,
wherein said third electrode is more distal the near edge of said faceplate than is said second electrode,
whereby said third electrode is on said tube envelope between said second electrode and the far edge of said faceplate.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/561,536Filed 28 Apr 2000 · us provisional application
Priority: 30 Apr 1999
Granted: 5 Nov 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H01J 29/70
Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement: arrangements for…
H01J 29/72
Arrangements for deflecting ray or beam: along one straight line or along two perpendicular straight lines
H01J 31/12
Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes: with luminescent screen
H01J 31/128
With luminescent screen: provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digitally controlled…

Family

Application60/131,919Us provisional application · filed 30 Apr 1999
Application60/137,379Us provisional application · filed 3 Jun 1999
Application60/160,654Us provisional application · filed 21 Oct 1999
Application60/160,772Us provisional application · filed 21 Oct 1999
Application60/170,159Us provisional application · filed 10 Dec 1999
US 6,476,545 B1This patent

From the US filing history. Foreign family members aren’t listed.