US2739260A - Cathode-ray tube for color television - Google Patents

Cathode-ray tube for color television Download PDF

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Publication number
US2739260A
US2739260A US150732A US15073250A US2739260A US 2739260 A US2739260 A US 2739260A US 150732 A US150732 A US 150732A US 15073250 A US15073250 A US 15073250A US 2739260 A US2739260 A US 2739260A
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Prior art keywords
strips
grating
color
cathode
tube
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Expired - Lifetime
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US150732A
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English (en)
Inventor
Ernest O Lawrence
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Chromatic Television Laboratories Inc
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Chromatic Television Laboratories Inc
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Priority to NL7402382.A priority Critical patent/NL159107B/xx
Priority to BE502013D priority patent/BE502013A/xx
Application filed by Chromatic Television Laboratories Inc filed Critical Chromatic Television Laboratories Inc
Priority to US150732A priority patent/US2739260A/en
Priority to GB3645/51A priority patent/GB721199A/en
Priority to FR1033838D priority patent/FR1033838A/fr
Priority to DEC3949A priority patent/DE914386C/de
Application granted granted Critical
Publication of US2739260A publication Critical patent/US2739260A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • This invention relates to cathode-ray tubes for displaying television images in polychrome, and particularly to tubes for displaying such images directly upon the luminescent screen or target of the tube by either a two-color or three-color additive system without the necessity for interposing between the target and the observer any optical system for superimposing the images or portions of images which are representative of the primary colors employed in the system.
  • a cathode-ray tube wherein the color displayed upon any elementary area of the displaying surface can be controlled by purely electrical means; to provide a tube of the character described wherein the potentials employed for the control of the color of the display are but a few percent of the total potential used for accelerating the electron beam; to provide a polychrome cathode-ray display tube wherein the color instantaneously visible upon the display surface is independent of the path followed by the beam in scanning the image, so that no means need to be provided for insuring absolute linearity of scan as in the case where (as has been proposed in the past) phosphors emissive of ditferent colors are laid down upon a single display area in strips or spots of sub-elemental size; to provide a tube of the character described which is applicable to either simultaneous or sequential methods of transmitting the signals representative of the different primary colors and, among the sequential systems, is equally applicable to field sequential, line sequential, dot sequential or dot-sequential multiplex systems; and to
  • Monochrome or black-and-white television transmissions in the United States are, at the present time, standardized on a basis which is referred to as a 525-line picture with 2:1 interlace transmitted at thirty frames per second.
  • the cathode-ray beam or other scanning element which traces out the television images is deflected in the vertical dimension of the picture field at 60 cycles per second and in the horizontal direction at 262% times that rate or 15,750 cycles per second, thus producing two fields or rasters of scanning lines each containing nominally 262 /2 lines.
  • the lines of the second raster fall between those of the first so as to produce a total of 525 horizontal deflections for each two vertical deflections.
  • the scanning beam is blanked out for approximately 8% of the total vertical scanning time to take care of the fly-back or return of the beam from bottom to top of the image field, and as a result the actual picture shows approximately 480 lines in the visible field instead of the nominal 525 lines.
  • the method-employedin the past has been to use a rotating color filter in front of the display tube, the latter being provided with a phosphor or mixture of phosphors-emissive of all of the primaries.
  • the filter disk or drum removes from the emitted light the components of the colors not momentarily being transmitted.
  • a rotating mechanical filter offers a complication which is undesired and, as will be shown, which may be avoided by the use of the tube of this invention.
  • the tube of this invention avoids all of the registration problems mentioned; the target or luminescent area is scanned exactly as in the case of a black-and-white image and the color produced by such scanning is altered by an electrical potential which may be varied at any rate desired, either to produce field, line, or dotsequence.
  • the tube of my invention comprises the usual evacuated envelope of glass or glass and'metal which contains a cathode ray gun of any suitable type for directing a beam of cathode rays against a target area formed at the end of the tube opposite the gun.
  • the usual deflecting devices either electrostatic or electromagnetic, for sweeping the beam across the target area in two directions are either built into the tube or are externally supplied.
  • a transparent target area may either be formed upon a window in the end of the envelope itself or it may be.
  • the target area is supplied with a coating of phosphor which, under bombardment by cathode rays, fluoresces (or phosphoresces with a short period) in one of the primary colors chosen for the transmission of the polychrome pictures.
  • a coating of phosphor which, under bombardment by cathode rays, fluoresces (or phosphoresces with a short period) in one of the primary colors chosen for the transmission of the polychrome pictures.
  • a grating formed of a plurality of mutually insulated conductive strips mounted substantially edge-on with respect to the target surface.
  • Each of these strips is coated, preferably on both sides, with a phosphor emissive of another of the primary colors used in the picture transmission; it a three-colorsystemis employed alternate strips carry phosphors emissive of the two other primaries.
  • Strips carrying phosphors of the same color are electrically connected, and external connections are provided so that deflecting potentials can be applied between the strips carrying different color phosphors.
  • the strips forming the grating are in concentric circles, ellipses or the like.
  • the width of the individual strips is of the order of ten times their separation, although this value is not critical and narrower strips can be used at the expense of the use of higher potentials to control the colors to be displayed.
  • the alinement of the strips is not important, but they should, in general, be approximately parallel if this term he considered as broad enough to include their disposition
  • the surfaces in which the strips lie should, in general, be parallel to or substantially coincident with a surface includingv the path of the cathode ray as it enters the grating; i'.
  • the strip should lie edgewise to the orifice of the cathoderay gun or else means should be provided to deflect the cathode ray beam just prior to its entering into the grating to such a degree that in the absence of any deflecting potential on the grating it will strike only the proximal edge of the strips and will have no appreciable component of velocity normal to the flat surface of the strips.
  • the primary chosen for emission by the coating of the target surface itself be green, and that alternate strips of the grating are coated with phosphors which luminesce in red and blue respectively, if the beam be deflected across the surface of grating and target in the ordinary manner for scanning a television field, the surface of the target area itself will receive the entire electron flow from the beam and will luminesce in green as long as no differential potential is applied between the strips forming the grating.
  • the beam will be deflected after it enters the space between the strips toward the one which carries the relatively positive potential and away from that carrying the negative potential. If the width of the grating strips be ten times their separation a potential difference of approximately 4% of the total voltage used to decelerate the beam will cause all of the electrons of the beam to fall upon the strip which is positive.
  • the strip thus receiving the beam will fluoresce in the primary color proper to the phosphor with which it is coated, and because the light thus emitted is confined between surfaces which are largely reflective a major portion of the emitted light will be transferred to the target area and will be transmitted through the translucent screen.
  • the adjacent strips confine the light thus emitted and reflected to a narrow strip which is approximately equal in width to the separation between the strips.
  • each red strip is between two blue ones it makes no difference whether the beam happens to fall wholly on one or the other side of the red strip if the latter is positive the beam will always be defiected in passing through the grating so that it hits the strip "which will fluoresce in red.
  • each blue strip is adjacent two red ones, and if the blue strips be positive with respect to the red only blue luminescence willbe produced.
  • Fig. 1 is a schematic diagram of a tube in accordance with this invention, together with elementary circuits illustrative of what is required to cause the display thereon to appear in any one of three primary colors;
  • Fig. 2 is a diagram showing the display end of a tube similar to that shown in Fig. 1 more in detail, but still in schematic form;
  • Fig. 3 is a view showing the disposition and, to some extent, the construction of the grating of the tube of Fig. 2, relative planes of section in views 2 and 3 being indicated by the appropriately designated lines in the two views;
  • Fig. 4 is an enlarged cross-sectional view indicating one method of constructing a grating of the type described
  • Fig. 5 is another enlarged detailed view, in perspective, illustrating another possible method of construction
  • Fig. 6 shows stilt another modification of construction of the grating
  • Fig. 7 shows a fourth method of constructing the grating
  • Fig. 8 is illustrative of a grating formed of concentric spiral strips rather than the plane parallel strips indicated in other figures;
  • Fig. 9 shows a grating formed of wedge-shaped strips as distinguished from the plane strips indicated in the preceding figures
  • Fig. 10 shows a form of grating wherein the phosphors are deposited on beads carried on the edges of the grating strips rather than strips themselves;
  • Fig. 11 is a diagram indicating the deflection of the cathode-ray beam under different deflecting voltages.
  • the tube in general, as shown schematically in Fig. l and in slightly greater detail in Figs. 2 and 3, it comprises the usual evacuated envelope 1, which may be of either glass or metal.
  • the tube is, as is customary, of generally conical or even rectangular form, having at the base of the core a transparent window 3.
  • an electron gun mounted in the smaller end of the cone is an electron gun of conventional form. This is shown as comprising a filament or heater 5, which raises a thermo-emissive cathode 7 to its emitting temperature. Electrons emitted by the cathode are amplitude modulated by a grid 9 and are successively accelerated by first and second anodes 11 and 13. The electron beam thus formed may either be focused by electron lenses established by the fields between the various elements or external focusing coils (not shown) may be employed. The proper voltages for exciting the various electrodes mentioned are supplied by the television receiver indicated schematically by the block 15.
  • the electron beam produced by the gun is deflected in two dimensions, in this instance, by the coils 17 and 19 which carry, respectively, sawtooth currents of the two frequencies utilized to produce the vertical and horizontal scannings as produced by scanning oscillators of proper form indicated by the block 21.
  • the coils 17 will carry sawtooth waves having a fundamental frequency of 60 cycles per second, while the coils 19 will carry similarly shaped waves at a frequency of 15,750 cycles per second.
  • the currents in these coils are adjusted to cause the oathode-ray beam to trace upon the Window of the tube rectangular rasters of the proper shape and interlace.
  • a translucent layer of a phosphor Formed upon the Window of the tube is a translucent layer of a phosphor which, when excited by the electron beam, will emit light corresponding to one of the primary colors chosen for use in the system wherein the tube is to be employed.
  • the particles of the phosphors which are deposited upon the window to form the screen are of microscopic size. They are illustrated in the drawing, however, by discrete circles, and as, for reasons which will be gone into more fully hereinafter, I prefer to deposit the green phosphor directly upon the target area of the tube, circles of this type will be used throughout the drawings to indicate the green phosphor.
  • phosphors used in the construction of the device will normally be emissive of red and blue light respectively, and like the green phosphor will be formed of particles of microscopic size. They will be illustrated, however, by small triangles and rectangles respectively, such representation, of course, being purely symbolic.
  • the luminescent coating 23, deposited directly upon the Window 3 is rendered conducting by any of a number of well known methods, perhaps the best of which is the deposition upon it, on the side facing the cathode-ray gun, of an extremely thin metallic layer such as may be formed, for example, by the evaporation of aluminum.
  • a lead 25 connects this coating with the receiver which is arranged to apply suitable potential thereto to give the cathode-ray beam its final acceleration.
  • a grid or grating formed of alternate mutually insulated strips or" conducting material coated on both sides with phosphors emissive of one of the other two primaries employed in the system.
  • Strips 27 carrying the red phosphor are connected together, as are the strips 29 which carry the blue phosphor.
  • a lead 31 connects all of the red phosphors to one pole of a switching mechanism 32 which is here shown, for illustrative purposes only, as being of the mechanical type, while a second lead 33 connects all of the blue bearing strips to another pole of the same or an interlocked switch 32'.
  • Means, here illustrated as batteries 35, 35, connect from the lead 25 to the contacts of the switches.
  • the batteries 35, 35' are so poled that when the switches are thrown in one direction all of the strips 27 will be positive with respect to the target 23 while all of the strips 29 will be negative to the target, whereas, when the switches are thrown in the opposite direction, the reverse will be the case. When the switches are in their intermediate position all of the strips and the target area will be at the same potential.
  • Fig. l The diagram of Fig. l, as well as those which will be described later, are not to be considered as representative to scale of the relative sizes or separations of the strips of the color grating, but are merely a showing of the relative positions of the grating and of the strips comprising it.
  • Means are provided for causing the electron beam to enter the grating at any point in a direction parallel to the wider dimension of the strips, so that when the latter are at the same potential as the target area itself they will have no tendency to deflect the beam, which, accordingly, will strike the strips at barely grazing incidence if at all.
  • auxiliary focusing means may be used adjacent the display end of the cathode ray tube for bending the beam into a path parallel with the strips, or the strips can be arranged in planes slightly tilted with respect to each other and which intersect in a common line substantially at the orifice or effective exit aperture of the electron gun, as is indicated in Fig. 1.
  • the two procedures are considered to be equivalent; means for setting up corrective fields of the character first mentioned are well known and therefore arenot here'shown. Arrange ments for tilting the strips as mentioned are illustrated in Figs. and 7.
  • the relative widths and spacings of the strips forming the grating are subject to rather wide variations. It can be shown that if the width of the strips is ten times their separation, a potential difference of 4% of the voltage employed to give the electrons their velocity upon entering the grating, applied between the two sets of strips, will be sufficient to cause all of the electrons of the beam which enter the space between two adjacent strips to impinge on whichever of the two is the more positive; i. e., if the voltage accelerating the beam is 10,000 volts a 400-volt differential between the two sets of strips. will cause all of the electrons to strike the strips carrying either the blue or the red phosphors as the case may be.
  • the ratio of separation of the strips to their widths is not critical, but it is directly connected with the voltage required to cause complete switching as between the primary colors emitted, this voltage being proportional to the square of the ratio between separation and width; thus while a separation-width ratio of requires about 4% of the beam accelerating voltage to cause complete deflection, a ratio of 5% will cause complete color transfer upon application between the strips of 1% of the accelerating voltage.
  • the choice of separation-width ratio is therefore a compromise between electrical and mechanical features and is subject to variation at the option of the designer of the equipment.
  • the absolute dimensions of the strips constituting the grating are a function of the size of the screen and of the resolution which is to be required of it.
  • the separation between the adjacent strips should be materially smaller than the dimension of the picture elements which it is desired to resolve.
  • a separation equal to onehalf of diameter of a single picture element is satisfactory, but a separation of one-third of the diameter of the picture element to be resolved gives somewhat improved resolution. Further reduction of the separation gives no improvement in resolution if the beam diameter is of the proper size.
  • each lineon the maximum size picture which may be displayed on a 1.6-inch diameter screen is 8/ of an inch wide.
  • a separation between adjacent strips of ,5 of aninch will therefore give a one-half element separation, which has been indicated above as the maximumdesirable.
  • the strips themselves have, of course, finite thickness, and experiment has shown that copper strip 3 mils in thickness is appropriate for forming the grating. Subtracting the thickness of the strips from the 10 mil theoretical separation gives an actual separation of 7 mils, and strips of an inch wide. With such stripsa satisfactory grating may be formed by any of the methods next to be described.
  • Figs. 2, 3 and 4 One out of several methods of constructing the grating is illustrated in Figs. 2, 3 and 4, still in semi-diagrammatic form, the dimensions again being exaggerated in order to show more clearly the actual construction.
  • the strips 27 and 29 which form the grating are laced or woven together by means of fiber glass cords 37 which are laced around the strips at intervals along their length.
  • fiber glass cords 37 which are laced around the strips at intervals along their length.
  • Fig. 3 only two of these cords are shown but as the gratings are actually constructed they are placed at intervals along the strips which are of the same order of magnitude as the spacing between the strips.
  • the ends of the strips are set in slots formed at insulated end supports 39.
  • the strips are slightly staggered lengthwise so that strips 27 project beyond strips 29 at one end where they are electrically connected to the lead 31, while at the other end the strips 29 project and are connected to the lead 33.
  • the same convention as before is used to indicate the different colored phosphors.
  • Figs. 5, show alternative methods of fastening the strips together'intoa continuous grating.
  • notches 41 are formed at in tervals along the strips.
  • notched insulating blocksor separators 43 are positioned between the strips with notches alined with the notches in the strips themselves, and binding cords of fiber-glass 45, positioned by the notches, fasten the whole structure together.
  • the separators are slightly wedge shaped to give the proper tilt to permit parallel entry of the beam, but the angle between any two successive strips is too small to show in the figures.
  • transverse corrugations 47 are formed in the strips, preferably before the deposition of the phosphors upon them. Insulating beads 49 are fused to these corrugations and serve to determine the relative positions of the strips. As before, the ends of the strips aresecured to support rods 39.
  • Fig. 9 shows a modificationof the device wherein the strips are wedge-shaped instead of flat as in the other modifications which have been described.
  • the wedgeshaped strips 27' and 29 are mounted with their apices facing the translucent target 23 and their bases toward the electron gun.
  • the grating can. be formed by sub stantially any of the methods that have been described for fiat strips.
  • This structure has the disadvantages that it cuts off a greater portion of the electron beam, the bases of the strip acting as a diaphragm which intercepts a considerable number of the electrons, and, further, that a higher voltage is required to deflect that portion of the beam which does pass through the grating and cause it to strike entirely against the proper phosphor.
  • the construction has the countervailing advantage that the transfer of light from the phosphors on the strips is more effective than in the other cases mentioned.
  • Fig. 10 Still a further modification is shown in Fig. 10.
  • the strips 27 and 29 are slightly wedge-shaped in form, but in this case transparent glass beads 56 are fused to the apices of the wedges and the phosphors are deposited upon these beads.
  • the beam does not have to be deflected so that it actually hits against the sides of the strips, but only far enough so that it hits the phosphors.
  • the optical efiiciency is somewhat higher than in the case of the flat strips. Control voltages are also required to be somewhat higher than before, but not quite as high as in the case of the modification of Fig. 9.
  • Fig. 11 shows the strips 27 as positive and strips 29 as negative.
  • the fields between the strips are oppositely directed as between successive pairs of strips; i. e., a field between the upper strip 291 and strip 271 is directed (conventionally) downward, while the field between strips 271 and 292 is directed upward.
  • the beam may fall, it is deflected toward that strip as shown by the dotted lines 55' and if the control voltage be properly chosen with respect to the strip separation and beam velocity it will strike on that strip only and excite only the correspond ing phosphor. If the strip sizes and separation are of the magnitude here recommended the beam will strike at least two strips of the same color phosphor, and the light falling on and transmitted by the translucent target will be all of one color. Reversal of the control voltage will change the color from red to blue or vice versa as the case may be.
  • One of the major advantages of the tube of this invention is that no necessity arises for having the beam follow the strips. Wherever it may fall it will produce a spot of light of the proper color and of approximately the dimension of the cross-section of the beam.
  • the strips may therefore be mounted either parallel to, transverse to or diagonal to the scanning line without any material effect upon the picture. It is this fact also which makes the spiral construction of the screen posible.
  • the distances between successive strips be substantially a constant, i. e., that the strips be parallel, either in the rigorous sense of that term or substantially concentric.
  • blue phosphors would be deposited on the grating strips.
  • This arrangement is chosen purely from practical consideration; theoretically phosphors emissive of any three colors, none of which can be formed by additive combinations of the other two, may be used and it is immaterial which of these phosphors be deposited upon the target itself and which upon the grating strips. Actually it may be shown that the best color fidelity can be secured by the use of red, green and blue phosphors, and because of the much greater sensitivity of the eye to green light than to light of the other two primary colors detail is much more visible in green than it is when depicted in the other primary colored lights.
  • the tube of this invention is applicable not only to field, line or dot sequential systems but also to simultaneous systems of television transmission. It is believed that the method of application to any sequential system is self-evident. Its use for simultaneous systems involves the reception of the three simultaneously transmitted color signals and their switching as between the target and the strip areas at a high rate which is independent of any transmitted signal but which is determined within the receiver itself. This method of simultaneous reception is covered by a copending patent application filed simultaneously with this; such simultaneous method of reception is not considered to be a part of this invention but is mentioned here merely to emphasize the versatility of the tube of this invention.
  • a cathode-ray tube for the production of television images in polychrome comprising an envelop, an electron gun within said envelop for generating a beam of cathode rays, a target area within said envelope formed of transparent material and positioned to receive said beam of cathode rays, a translucent coating of a phosphor emissive of light of one primary color on said target area, a grating comprising a plurality of mutually insulated conductive strips mounted edge-on adjacent to said translucent coating, said strips being wedge-shaped in cross section Withthebases, of .the wedges directed toward the cathode-ray gun and the apices of the wedges directed toward the target area, a coating of aphosphor .ernissive of .light of a difierentprimary color from that of said first mentioned coating on each of saidtstrips, and electrical connections to all of said strips for applying deflecting potentials therebetween.
  • a cathode-ray tubevfor the production of television images in polychrome comprising an envelop, anelectron gun Within said envelop for generating a beam of cathode rays, a target area within said envelop formed of transparent material and positioned to receive said beam of cathode rays, a translucent coating of a phosphor emissive of light of one primary color ontsaid target area, a grating comprising a plurality of mutually insulated conductive strips mounted edge-on closely adjacent to said translucent coating, glass beadssecured to the edges of said strips comprising the grating which are apposed to the target area.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US150732A 1950-03-20 1950-03-20 Cathode-ray tube for color television Expired - Lifetime US2739260A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL7402382.A NL159107B (nl) 1950-03-20 Werkwijze ter bereiding van penicilline- en cefalosporinederivaten onder toepassing van silylerende verbinding.
BE502013D BE502013A (enrdf_load_stackoverflow) 1950-03-20
US150732A US2739260A (en) 1950-03-20 1950-03-20 Cathode-ray tube for color television
GB3645/51A GB721199A (en) 1950-03-20 1951-02-15 Improvements in or relating to cathode ray tubes for colour television
FR1033838D FR1033838A (fr) 1950-03-20 1951-03-12 Tube cathodique pour télévision en couleurs
DEC3949A DE914386C (de) 1950-03-20 1951-03-20 Kathodenstrahlroehre fuer die Wiedergabe vielfarbiger Fernsehbilder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US150732A US2739260A (en) 1950-03-20 1950-03-20 Cathode-ray tube for color television

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US2739260A true US2739260A (en) 1956-03-20

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US150732A Expired - Lifetime US2739260A (en) 1950-03-20 1950-03-20 Cathode-ray tube for color television

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US (1) US2739260A (enrdf_load_stackoverflow)
BE (1) BE502013A (enrdf_load_stackoverflow)
DE (1) DE914386C (enrdf_load_stackoverflow)
FR (1) FR1033838A (enrdf_load_stackoverflow)
GB (1) GB721199A (enrdf_load_stackoverflow)
NL (1) NL159107B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2792522A (en) * 1953-09-18 1957-05-14 Westinghouse Electric Corp Color television tube
US3202864A (en) * 1961-05-26 1965-08-24 Bell Telephone Labor Inc Electron beam device having divergent emission electron gun
US4635107A (en) * 1984-08-20 1987-01-06 International Business Machines Corporation Electron beam position control for color display
US20020125825A1 (en) * 2001-03-09 2002-09-12 Koninklijke Philips Electronics N.V. Picture display device of the index type

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB443896A (en) * 1934-10-06 1936-03-10 Gen Electric Co Ltd Improvements in or relating to television
US2307188A (en) * 1940-11-30 1943-01-05 Rca Corp Television system
US2446440A (en) * 1947-01-28 1948-08-03 Rca Corp Color television tube
US2446249A (en) * 1946-05-04 1948-08-03 Rca Corp Pickup tube for color television
US2461515A (en) * 1945-07-16 1949-02-15 Arthur B Bronwell Color television system
US2498705A (en) * 1947-07-02 1950-02-28 Int Standard Electric Corp Electronic color television
US2518200A (en) * 1947-10-03 1950-08-08 Rca Corp Television system
US2529485A (en) * 1945-10-09 1950-11-14 Thornton W Chew Color television
US2571991A (en) * 1950-01-31 1951-10-16 Rca Corp Color television tube
US2579705A (en) * 1950-01-27 1951-12-25 Rca Corp Color television system
US2635203A (en) * 1951-01-02 1953-04-14 Rauland Corp Color television tube

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB443896A (en) * 1934-10-06 1936-03-10 Gen Electric Co Ltd Improvements in or relating to television
US2307188A (en) * 1940-11-30 1943-01-05 Rca Corp Television system
US2461515A (en) * 1945-07-16 1949-02-15 Arthur B Bronwell Color television system
US2529485A (en) * 1945-10-09 1950-11-14 Thornton W Chew Color television
US2446249A (en) * 1946-05-04 1948-08-03 Rca Corp Pickup tube for color television
US2446440A (en) * 1947-01-28 1948-08-03 Rca Corp Color television tube
US2498705A (en) * 1947-07-02 1950-02-28 Int Standard Electric Corp Electronic color television
US2518200A (en) * 1947-10-03 1950-08-08 Rca Corp Television system
US2579705A (en) * 1950-01-27 1951-12-25 Rca Corp Color television system
US2571991A (en) * 1950-01-31 1951-10-16 Rca Corp Color television tube
US2635203A (en) * 1951-01-02 1953-04-14 Rauland Corp Color television tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2792522A (en) * 1953-09-18 1957-05-14 Westinghouse Electric Corp Color television tube
US3202864A (en) * 1961-05-26 1965-08-24 Bell Telephone Labor Inc Electron beam device having divergent emission electron gun
US4635107A (en) * 1984-08-20 1987-01-06 International Business Machines Corporation Electron beam position control for color display
US20020125825A1 (en) * 2001-03-09 2002-09-12 Koninklijke Philips Electronics N.V. Picture display device of the index type
US6829019B2 (en) * 2001-03-09 2004-12-07 Koninklijke Philips Electronics N.V. Picture display device of the index type

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DE914386C (de) 1954-07-01
FR1033838A (fr) 1953-07-16
GB721199A (en) 1955-01-05
NL159107B (nl)
BE502013A (enrdf_load_stackoverflow)

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