US3621319A - Flat color television tube having plurality of mirror deflection systems - Google Patents

Flat color television tube having plurality of mirror deflection systems Download PDF

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Publication number
US3621319A
US3621319A US740329A US3621319DA US3621319A US 3621319 A US3621319 A US 3621319A US 740329 A US740329 A US 740329A US 3621319D A US3621319D A US 3621319DA US 3621319 A US3621319 A US 3621319A
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United States
Prior art keywords
electrode
picture screen
screen electrode
color control
control grid
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Expired - Lifetime
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US740329A
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English (en)
Inventor
Hinrich Heynisch
Hannjorg Bittorf
Werner Veith
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Printing Developments Inc
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Printing Developments Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
    • H04N9/26—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using electron-optical colour selection means, e.g. line grid, deflection means in or near the gun or near the phosphor screen

Definitions

  • the picture screen electrode has a plurality of luminous strips arranged substantially parallel to one another
  • a 54] FLAT COLOR TELEVISION TUBE HAVING pair of grids are arranged behind the picture screen electrode PLURALI'I'Y 0F MIRROR DEFLECTION SYSTEMS 5 Claims, 3 Drawing Figs.
  • the first of the pair of grids consists of a plurality of narrow parallel strips sloping against the picture screen electrode.
  • the electron beam is directed into the space between the picture screen electrode and the recoil electrode in a direction generally away from the picture screen electrode.
  • the potential of the recoil electrode reverses the direction of the beam toward the picture screen electrode and through the pair of grids.
  • the field of art to which this invention pertains is a cathoderay tube for the reproduction of color images and in particular to a cathode-ray tube having a plurality of color stripes as the image reproducing means.
  • FIG. 1 is a cross section of a flat picture tube described above;
  • FIGS. 2 and 3 show the path of associated beams.
  • the invention pertains to an electron beam tube having only one electronic beam for the reproduction of colored television images on a picture screen having at least two luminous substances of elementary groups and having two grids arranged ahead thereof. These grids have such potentials that in the range of one grid (the color control grid) braked electrons of some 100 volts are present.
  • the color control grid is in the form of narrow parallel metal strips sloping against the screen electrode normal line.
  • the other grid is arranged ahead of the color control grid as a potential plane grid and consists of a mesh grid of any structure.
  • the elementary groups of the picture screen consist of luminous stripes extending parallel to the metal bands or slats of the color control grid.
  • the color selection takes place by individual cylindrical lenses formed in the range of the color control grid.
  • the color control voltage is thereby applied jointly, for example to the color control grid, the potential grid and perhaps also to the picture screen electrode.
  • the constant impact angle absolutely indispensable for color control in the prior art is 90.
  • the maintenance of such a 90 requirement over the entire picture screen causes considerable difliculties.
  • this angle is not maintained precisely there will be considerable color errors.
  • the present invention resolves the above-reported difiiculties in maintaining a constant impact angle of the electron ray by designing the discharge vessel as a flat picture tube having certain electron optic features connected therewith.
  • the focusing achieved thereby, and thus the resolution governing the quality of the image, are independent in a first approximation of the beam width, that is the line length.
  • the beam width that is the line length.
  • This is accomplished with particular advantage in that the electron beam is deflected approximately immediately prior to the collimator system by 135 with the aid of a deflector electrode. This would require a generator system laterally from the picture with a system axis oriented vertically to the picture screen electrode.
  • the axis of the system for generating the electron beams may 'extend parallel to the picture screen electrode.
  • a deflector electrode particularly a deflection plate
  • the axis of the system for generating the electron beams may 'extend parallel to the picture screen electrode.
  • an electron gun I generates an electron beam 2, which extends parallel to a potential grid 3. Focusing installations 4 and 5 focus independently of each other in two mutually perpendicular directions.
  • a linear deflection system 6 is provided for image deflection. This system is energized with sawtooth voltage. In its further path the electron beam is first deflected at a deflection electrode 9 by 90 and subsequently at an additional deflection electrode 10 by I35", a total of 225. Such a deflection angle would also be possible in a single operation in a corresponding cylindrical condenser.
  • Electrode 11 extending substantially perpendicularly to the potential grid and provided as a joint counterelectrode for the two deflection plates 9 and 10 is used simultaneously as a screen for the electron beam against the deflection plate condenser area.
  • the electrode 11 has a relatively high positive potential.
  • the image deflection system 6 which may consist of a pair of panels deflects the beam out of the plane of the drawing.
  • a sequence of electron beams extending over the center line of a cylinder is produced at the image deflection installation 6 after reflection of the electrons at the plate during the passage of the image sawtooth voltages therethrough.
  • the deflection plate 10 In order for a marginal ray 13 to be reflected following reflection at reflector in the same plane 14 as a central ray 12, the deflection plate 10 must be twisted, that is to say curved accordingly. A sequence of parallel rays, all of which enter the reflector (reversing) area precisely at 45, is then produced behind the collimating slots as the sawtooth voltage passes therethrough. The amperage of the electron beam is thereby highly overdimensioned, that is, it is so selected that following the scattering of the ray 14 at the focal points 7 and 8 of the collimator system, a still adequate current is available.
  • the electron beam entering the reflector and reversing area formed by electrodes 3 and 15 is bent back, depending on the momentary countervoltage of the counterelectrode 15 over a very short or a very long path 16 or 17 respectively to the potential grid 3 in order to enter the color control grid and to impact upon the screen electrode 21 with its luminous color strips.
  • the distance between the terminal points of impact 18 and 19 is thereby equal to the length of a line and thus approximately equal to the television image width.
  • the line deflection takes place in a type of counterfield focusing by means of a sawtooth voltage applied between potential grid 3 and recoil electrode 15, while the deflection of the image is accomplished by a linear electrostatic deflection system 6.
  • the means 4 and 5 for separate focusing in two directions perpendicular to each other are very diverse in their effect. While for focusing in one direction, namely parallel to the surface of the drawing, an additional deflective focusing will occur in both deflection plates 9 and 10; the means provided at the input accordingly only needs to supply a prefocusing.
  • a precision adjustment of the type of a dynamic focusing is carried out in view of the electron paths of diverse lengths until impact upon points 18 and 19. The individual beams leaving the collimator system 7 and 8 as a band beam extending parallel are thus focused only upon impact upon the image screen as a result of the focusing effect of the cylindrical lens 4 onto one point.
  • FIG. 2 shows schematically the possible splitting of the electron beam in the color control grid when the three colors are generated.
  • the electrons impact upon the color control grid 20 and afterwards upon the luminous screen electrode 21, whose elementary groups consist in each case of at least two and here three color strips (r,b,g) extending parallel to the color control grid.
  • the potential grid 3 comprises a woven mesh screen whose grid constant is in no connection with the grid constant of the color control grid 20. Its only task is to determine the potential of the electrons after reversal in the reflector area and to see that neat plane potential surfaces are produced in said reversing area. its potential preferably corresponds with that of the second collimator slot, that is approximately 3000-4000 volts.
  • the potential of the color control grid is some 100 volts above that of the cathode potential so that during color control operation zero volts is not reached. This makes possible the use of the entire aperture of the color control grid for the cross section of the electron ray without the occurrence of too great aberration errors at the edge of the individual lenses.
  • These individual lenses are formed by the three adjacent electrodes, namely the potential grid 3, the color control grid 20 and the luminous screen electrode 21.
  • the color control grid has the lowest potential of these three electrodes, namely some volts in relation to the cathode potential, while the luminous screen electrode has the highest positive potential in order to achieve as high a conversion of the electron energy into light.
  • a shifting of the electron beam in relation to the choice of color is accomplished with high frequency, as can be generated in the simplest case by superimposing the auxiliary color carrier frequency on the first harmonic of the beam.
  • the electron beam 22 passing thru the potential grid 3 and subsequently thru the color control grid 20 impacts as beam 29 upon the image screen electrode 21, and on a luminous strip 21.
  • the beam is deflected by reducing the voltage at the color control grid into beam 30 upon another luminous strip 6.
  • the voltage variation required for color control is in the order of 100 volts.
  • Such a shifting can be accomplished by varying the DC voltage in order to correct the color of the image in a simple manner, so that a special coordination of the luminous strips with the color control slats, which is difficult, is unnecessary.
  • the following advantages are obtained by the flat image and counterfield focusing over the color control colored picture tubes known in the prior art.
  • the incoming and/or impact angle of 45 at the color control grid is assured over the entire image surface.
  • the color control grid must be produced precisely and with a low tolerance, a dotlike coordination of the luminous stripe in relation to the gaps of the color control grid as in a masked tube is unnecessary.
  • lt sufflces for the structures of the color strips and the color control grid to be equal and to adjust both electrodes parallel to each other.
  • An exact coordination of the individual colors in their relative position with respect to the color control grid is un necessary because the ray can be shifted easily by variations in the DC bias at the color control grid. increased mechanical stability can be accomplished by noninterfering thin tension wires.
  • the capacity applicable between potential grid and color control grid can be maintained correspondingly low, in contrast to other tubes known from prior art by maintaining sufiiciently large distance therebetween. Furthermore, the control effect is increased over the color picture tube known under the name chromatron, due to the fact that the color selection grid is at lowest potential so that secondary electrons possibly generated can be aspirated off by the potential grid without reaching the image screen. In addition the color sequency of the luminous strips is cyclical and not alternating. A reduction of the assent of the color control grid for an increased release does not cause a corresponding increase of the control capacity.
  • the tube is appropriate both for in-line direction and in perpendicular direction thereto to achieve approximately the complete black-white resolution providing the structure of the color control grid is sufficiently fine.
  • An electron radiation tube having a source for generating one electron beam for the reproduction of color television images, one picture screen electrode having at least two fluorescent substances of different color-emitting characteristics thereon, said beam source being arranged in said tube to direct the electron beam in an initial direction substantially parallel to said picture screen electrode means for deflecting said beam, a first electrode for rotating the affected beam through an angle of substantially 90, a second electrode for rotating the beam through a further angle of substantially greater than 90 into a path with is directed generally away from the picture screen electrode, a recoil electrode spaced from the picture screen electrode for redirecting the beam generally toward said picture screen electrode, two grids arranged adjacent to said screen and means for applying such potentials to said grids so that in the range of one of said grids decelerated electrons of approximately 100 volts are present, one of said grids being a color control grid consisting of narrow parallel metal strips disposed at an angle to the picture screen, the other grid being arranged adjacent said color control grid oppositely of said screen and consisting of a mesh structure, the fluorescent substances of the
  • An electron discharge device comprising a tube envelope having a picture screen electrode disposed adjacent to a viewing surface thereof, said picture screen electrode having a plurality of stripes of different color emitting fluorescent substances arranged substantially parallel to one another along the surface thereof, a color control grid structure arranged in a plane substantially parallel to and ahead said picture screen, said color control grid including a plurality of relatively narrow substantially parallel strips sloping against the picture screen electrode and being substantially parallel to the color stripes thereof, a grid arranged in a plane immediately ahead and substantially parallel to said color control grid, a source for generating an electron beam in said tube initially in a direction generally parallel to said picture screen electrode, a first electrode for rotating the beam through an angle of substantially a second electrode for rotating the beam through a further angle of substantially greater than 90 into a path which is directed generally away from the picture screen electrode, a recoil electrode spaced from the picture screen electrode for redirecting the beam generally toward said picture screen electrode, first beam deflection means located between said beam source and said first electrode, and means for varying the voltage on said reco

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US740329A 1967-06-27 1968-06-26 Flat color television tube having plurality of mirror deflection systems Expired - Lifetime US3621319A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES110520A DE1286541B (de) 1967-06-27 1967-06-27 Farbfernseh-Flachbildroehre

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US3621319A true US3621319A (en) 1971-11-16

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US740329A Expired - Lifetime US3621319A (en) 1967-06-27 1968-06-26 Flat color television tube having plurality of mirror deflection systems

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US (1) US3621319A (enrdf_load_stackoverflow)
DE (1) DE1286541B (enrdf_load_stackoverflow)
FR (1) FR1570266A (enrdf_load_stackoverflow)
GB (1) GB1223723A (enrdf_load_stackoverflow)
NL (1) NL6804380A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308486A (en) * 1979-11-27 1981-12-29 Rca Corporation Line cathode structure having recessed geometry
US4598233A (en) * 1979-09-21 1986-07-01 U.S. Philips Corporation Color display tube and device having such a tube
US4812708A (en) * 1985-01-29 1989-03-14 Rca Licensing Corp. Thin cathode-ray tube
EP0427331A1 (en) * 1989-11-08 1991-05-15 Koninklijke Philips Electronics N.V. Display device and cathode-ray tube for such a display device, method and device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4956575A (en) * 1989-03-23 1990-09-11 Chang Kern K N Flat panel display with deflection modulation structure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650264A (en) * 1949-12-22 1953-08-25 Rca Corp Color television reproducing system
US2926274A (en) * 1955-06-20 1960-02-23 Nat Res Dev Electron lenses
US2999957A (en) * 1956-08-01 1961-09-12 Philips Corp Cathode ray tube
US3041489A (en) * 1958-09-26 1962-06-26 Siemens Und Halske Ag Berlin A Single-beam color television picture tube
US3064154A (en) * 1959-10-29 1962-11-13 Rca Corp Cathode ray tube
US3412282A (en) * 1964-11-09 1968-11-19 Tektronix Inc Cathode ray tube employing electron mirror

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650264A (en) * 1949-12-22 1953-08-25 Rca Corp Color television reproducing system
US2926274A (en) * 1955-06-20 1960-02-23 Nat Res Dev Electron lenses
US2999957A (en) * 1956-08-01 1961-09-12 Philips Corp Cathode ray tube
US3041489A (en) * 1958-09-26 1962-06-26 Siemens Und Halske Ag Berlin A Single-beam color television picture tube
US3064154A (en) * 1959-10-29 1962-11-13 Rca Corp Cathode ray tube
US3412282A (en) * 1964-11-09 1968-11-19 Tektronix Inc Cathode ray tube employing electron mirror

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598233A (en) * 1979-09-21 1986-07-01 U.S. Philips Corporation Color display tube and device having such a tube
US4308486A (en) * 1979-11-27 1981-12-29 Rca Corporation Line cathode structure having recessed geometry
US4812708A (en) * 1985-01-29 1989-03-14 Rca Licensing Corp. Thin cathode-ray tube
EP0427331A1 (en) * 1989-11-08 1991-05-15 Koninklijke Philips Electronics N.V. Display device and cathode-ray tube for such a display device, method and device

Also Published As

Publication number Publication date
GB1223723A (en) 1971-03-03
FR1570266A (enrdf_load_stackoverflow) 1969-06-06
DE1286541B (de) 1969-01-09
NL6804380A (enrdf_load_stackoverflow) 1968-12-30

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