US2938142A - Control of color television systems of the cathode ray tube type - Google Patents

Control of color television systems of the cathode ray tube type Download PDF

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US2938142A
US2938142A US498710A US49871055A US2938142A US 2938142 A US2938142 A US 2938142A US 498710 A US498710 A US 498710A US 49871055 A US49871055 A US 49871055A US 2938142 A US2938142 A US 2938142A
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color
cathode ray
electron beam
ray tube
elements
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US498710A
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Warren J Oestreicher
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KENDON ELECTRONICS Inc
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KENDON ELECTRONICS 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

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  • This invention relates to cathode ray apparatus for color television and more specifically to a reproduction system of the aperture mask type.
  • One of. the objects of this invention is to reproduce two or more colors from a corresponding number of phosphor elements or strips by displacing the electron beam under control of color information signals so as to move the image produced by the apertures of the mask on the phosphor elements about axes formed by the separation lines between adjacent phosphor elements.
  • Another object of the invention is to apply color and intensity information signals to separate electrodes.
  • Still another object of the invention is to displace the axis of the electron beam under control of color information signals so as to produce a displaced beam intersecting the 'undisplaced beam at the aperture mask.
  • a further object of the invention is to adjust the white balance by adjusting the rest position of the shadows produced by the-.mask apertures on the separation lines be tween adjacent phosphor elements.
  • Fig. 1 represents an arrangement of aperture mask and phosphor elements as actuated by an electron beam in accordance with this invention.
  • Figs. 2 and 3 represent a modification of Fig. 1.
  • Fig. 4 represents a circuit for operating an arrangement of the aperture mask type such as shown in Fig. 1 in accordance with certain principles of the invention.
  • Figs. 5 and 6 represent a portion of the circuit of Fig. 4 in greater detail.
  • Fig. 6 represents a modification of Fig. 5.
  • Fig. 1 there are schematically indicated at 1, 2, 3, 4, a number of adjacent phosphor elements representing in cross-section two vertical strips of phosphor materials capable of reproducing respectively under the impact of electrons substantially complementary colors sufficient to cover at least an important portion of the visible spectral range.
  • an aperture mask 6 having openings or apertures 8, 8 aligned with phosphor strips 1, 2 and 3, 4, respectively, in such a manner that an electron beam 9 derived, for example, from a single electron gun 10 is capable of projecting or focusinga picture of an aperture as, for example, indicated in Fig. 1 at 7, on two adjacent phosphor elements of complementary color characteristics as, for example, indicated in Fig. 1 at 1 and 2.
  • the image thus produced 2,938,142 Patented May 24, 1960 by electron beam 9 over separation line between adjacent elements 1 and 2 is indicated in Fig. 1 by dotted line 11.
  • electron beam 9 under control of corresponding color information signals is caused to deviate in one direction or another as indicated in Fig. 1 by arrows 12, 13 respectively and then reconverged so as to approach aperture mask (6) from varying angles, thereby causing reproduction of predetermined color hues controlled by different but predetermined proportions of phosphor strips which contribute depending upon the displacements of the electron image diiferent areas and therefore different amounts of fundamental colors to the difierent color hues.
  • the white balance of this color system is determined by the zero or rest position of image 11 produced by electron beam 9 with respect to the separation line between adjacent phosphor strips.
  • Adjustment of this zero position therefore can be used to adjust the white balance of the color system used in accordance with this invention.
  • FIG. 1 shows the invention in cross-sectional view, as applied to a two-color system
  • Fig. 2 shows in front elevation, a three-color phosphor screenelement where the arrays of adjacent longitudinal strips of phosphor elements of Fig. l are replaced by triplets of phosphor dots or segments arranged in the circular manner approximately indicated in Fig. 2 at 14, 15 and 16 forming the sectors of an approximate circular area indicated schematically by line 17.
  • the aperture mask has circular openings and the image cast by the electron beam on phosphor elements 14, 15 and 16 has in its zero or rest position the circular shape schematically indicated in Fig. 2 at 18.
  • a multi-directional type of deflection is used to reproduce color hues determined by ditferent proportions of color segments 14, 15, 16 covered by the electron image 18 cast by the mask apertures.
  • the electron beam and the corresponding image 18 is caused to execute a perpendicular movement as indicated perpendicular to arrows 12, 13 under control of corresponding circuits and color component information and color selection defiection plates similar to those shown with respect to Fig. 1 and a two-color reproduction system.
  • Fig. 3 shows the invention as applied to a two-color system which is somewhat improved in color rendering by the addition of a third color strip of well-defined dimension and structure, or by subdivision of one of the twocolor strips shown in Fig. 1 into two strips, or by replacing the color separation line between adjacent color strips, by a third color strip of predetermined width and structure as indicated for example in Fig. 3 by arranging an orange color strip 19 between cyan and magenta color strips 20, 21 with the mask image being indicated at 22 in an operating position depending upon the position of the electron beam.
  • the white balance can be adjusted in accordance with the invention by adjusting the zero rest position of the electron image 18 on color segments 14, 15, 16.
  • FIG. 4 an apparatus is illustrated to operate a tele-. vision system such as shown in Fig. 1.
  • the standard color signals derived from a transmitter and received at the receiver antenna, after corresponding amplification and separation are divided into hue and luminance Signals in otherwise well known manner.
  • the hue signals are demodulated at 23 in a manner also otherwise well known or as indicated in greater de tail in Figs. and 6,'and separated into orange-red video signals at 24 and into cyan video signals at 25.
  • stages 24 and 25 are respectively applied over lines 26, 27 to opposite deflection plates 23, 29 of cathode ray tube 30 causing the displacement of the axis of electron beam 31 derived from gun 32 in accordance with the invention, so as to cause movement of the electron picture image produced by openings 33 of aperture mask 34 of otherwise-well-kno-wn structure or of a structure such as disclosed in the above-mentioned copending patent application, on the adjacent pairs of At the same time electron beam 31 is caused to be periodically deviated with the aid of perpendicular electromagnetic deflection coils or systems 38,39 under control of synchronizing signals in otherwise Well known manner to efiect scanning of screen 37 as is well known in the art of operation ofcathode ray tubes.
  • Luminanceinformation is derived from amplifier 40 and applied over line- 41 to grid, 42 of cathode ray tube 30, so as to effect simultaneously with the changes in color hue the appropriate changes in intensity.
  • Electron beam 31 is produced in otherwise well known manner by a single cathode 41 which focuses electron beam 31 on screen 37.
  • electrostatic deflection plates 28, 29 are arranged concentric with respect to the axis or cathode ray tube 30 so as to produce a beam intersecting the axis of the beam when it is not displaced; this intersection will occur at a point substantially at or near aperture mask 34.
  • Electrostatic deflecting plates 28, 29 may be replaced by 7 other deflecting means such as electromagnetic deflecting coils without departing from the scope of the invention.
  • the white balance of the color system depends on the bias voltage applied to at least one of displacement plates 28, 29 or as indicated in Fig. 4 between displacement plates 28, 29.
  • This bias is derived from a potentiometer 43, adjustment of which will adjust the white balance in accordance with the invention.
  • This balance may also be effected by a magnetic field applied transversely in the vicinity of plates 28, 29 by,
  • a demodulation circuit such as shown in Fig. 4 at 23 isdescribed in detail in Fig. 5, involving a single tube 44 of the sheet beam or beam-sharing type in which electron beam. 45 after modulation is shared by two or more anodes 46, 47 under control of deflecting electrodes 43, 49 to which an appropriate source of synchronous reference signals is applied.
  • the same electrode structure serves simultaneously to perform the function of synchronous demodulation and amplification in separate channels 50, 51 which are connected'respectively to color selection deflecting plates 28, 29.
  • the varying electron current derived from beam 45 is used to produce a varying voltage across load" resistors 52, 53 and across a portion of white balance potentiometer 54, which also establishes the relatively static direct current potential of anodes 46, 47 and deflecting electrodes 28, 29.
  • diodes 55', 56 which may be of germanium, silicon or vacuum type, are excited by the reference oscillator circuit 57 in degrees phase displacement. Diodes 55, 56 therefore conduct for some part of the cycle, preferably over 5 or 10 degrees, and are biased through resistors SS, 59 to nonconduction for the remainder of the cycle.
  • the chroma signal therefore appears during this interval (of say 5 degrees) across the 10,000 ohm video load 58, 59.
  • the 3.56 mc. tuned circuit 60, 61 isolates the reference signal from the grids of twin amplifier 63, preventing biasing due to rectification.
  • the .25 mfd. capacitors 64, 65 block the direct current rectified by the diodes '55, 56 and prevent biasing of video amplifiers 63.
  • a number of juxtaposed phosphor elements of alternatingly difierent primary color reproduction an aperture mask in alignment therewith, means for directing an electron beam through said aperture mask to impinge upon said phosphor elements in the form of a shadow extending over the width of at least one of said elements, means for deflecting said electron beam under control of synchronizing pulses to provide a display raster on said elements, means for displacing the axis of said electron beam under control of composite color information pulses so as to produce a displaced beam having an axis intersecting the axis of said beam when in rest position at said aperture mask, thereby causing said shadow to bev shared simultaneously by adjacent primary color elements to reproduce said composite color, said displacing means including a pair of demodulating diodes under control of the undemodulatedi chrome input, a pair of separate amplifier means controlled by said diodes, a pair of electrostatic plates controlled by said amplifier means, and input means under control of local reference signals being inserted between said diodes and said amplifier

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Description

y 1950 w. J. OESTREICHER 2,938,142
CONTROL. OF COLOR TELEVISION SYSTEMS OF THE CATHODE RAY TUBE TYPE Filed April 1, 1955 F I65 F I65 LOCAL REFERENCE sc(3.5esmc) I SHEET BEAM 1480o TO D,
6%; 2 45 15 go i I r- 7 5'4 wnn'z BALANCE J 4: RL :3 V -n- [T TO Dz (29) f/ l 3% 47 UNDEMODULATEP CHROMA SIGNAL APERTURE NA5K4 3 a a I FOCUS E A n I a p, 38 3s 3 A I k ..:\3 i ,aa 2 8 D3, 3 A ACCELER- g 8 \lNlVOl-T 5 AqE F OEFLECTION 3 i 41 vows A B'Pos i ELEMENTS UNDEMOD.
* cmiomuauc: W 6
slquAL BHIGHTNESS mam. 12 A To D1 DEHODULATORS 63- M134 EP D H COL OR K 1 H-f SELECTION UNDEMOO. 'l 2, WHITE BALANCE PLATES IN cHRonA 2M GUN INPUT To Da CHROMA VIDEO AMP INVENTOR.
WARREN J'.oEsTRE|cHE TO LOCAL osc (3.56 mc) CONTROL OF COLOR TELEVISION SYSTEMS OF THE CATHODE RAY TUBE TYPE Warren J. Oestreicher, Flushing, N.Y., assignor to Kendon Electronics, Inc., a corporation of New York Filed Apr. 1, 1955, Ser. No. 498,710
2 Claims. -(Cl. 815-26) This invention relates to cathode ray apparatus for color television and more specifically to a reproduction system of the aperture mask type.
One of. the objects of this invention is to reproduce two or more colors from a corresponding number of phosphor elements or strips by displacing the electron beam under control of color information signals so as to move the image produced by the apertures of the mask on the phosphor elements about axes formed by the separation lines between adjacent phosphor elements.
Another object of the invention is to apply color and intensity information signals to separate electrodes.
Still another object of the invention is to displace the axis of the electron beam under control of color information signals so as to produce a displaced beam intersecting the 'undisplaced beam at the aperture mask.
A further object of the invention is to adjust the white balance by adjusting the rest position of the shadows produced by the-.mask apertures on the separation lines be tween adjacent phosphor elements.
These and other objects of the invention will be more fully understood from the drawings enclosed herewith in which Fig. 1 represents an arrangement of aperture mask and phosphor elements as actuated by an electron beam in accordance with this invention.
Figs. 2 and 3 represent a modification of Fig. 1.
Fig. 4 represents a circuit for operating an arrangement of the aperture mask type such as shown in Fig. 1 in accordance with certain principles of the invention.
Figs. 5 and 6 represent a portion of the circuit of Fig. 4 in greater detail.
Fig. 6 represents a modification of Fig. 5.
In Fig. 1 there are schematically indicated at 1, 2, 3, 4, a number of adjacent phosphor elements representing in cross-section two vertical strips of phosphor materials capable of reproducing respectively under the impact of electrons substantially complementary colors sufficient to cover at least an important portion of the visible spectral range.
These phosphor strips are reproduced on the inner face 5 of a cathode ray tube by means of screen-printing or any other means as is well known in the art of manufacture of cathode ray tubes.
In front of phosphor strips 1, 2, 3, 4, etc., and at a predetermined distance therefrom, there is arranged an aperture mask 6 having openings or apertures 8, 8 aligned with phosphor strips 1, 2 and 3, 4, respectively, in such a manner that an electron beam 9 derived, for example, from a single electron gun 10 is capable of projecting or focusinga picture of an aperture as, for example, indicated in Fig. 1 at 7, on two adjacent phosphor elements of complementary color characteristics as, for example, indicated in Fig. 1 at 1 and 2. The image thus produced 2,938,142 Patented May 24, 1960 by electron beam 9 over separation line between adjacent elements 1 and 2 is indicated in Fig. 1 by dotted line 11.
In accordance with one feature of this invention, as explained in greater detail in my copending patent application, Serial No. 495,953, filed March 22, 1955, electron beam 9 under control of corresponding color information signals is caused to deviate in one direction or another as indicated in Fig. 1 by arrows 12, 13 respectively and then reconverged so as to approach aperture mask (6) from varying angles, thereby causing reproduction of predetermined color hues controlled by different but predetermined proportions of phosphor strips which contribute depending upon the displacements of the electron image diiferent areas and therefore different amounts of fundamental colors to the difierent color hues.
The white balance of this color system is determined by the zero or rest position of image 11 produced by electron beam 9 with respect to the separation line between adjacent phosphor strips.
Adjustment of this zero position therefore can be used to adjust the white balance of the color system used in accordance with this invention.
While Fig. 1 shows the invention in cross-sectional view, as applied to a two-color system, Fig. 2 shows in front elevation, a three-color phosphor screenelement where the arrays of adjacent longitudinal strips of phosphor elements of Fig. l are replaced by triplets of phosphor dots or segments arranged in the circular manner approximately indicated in Fig. 2 at 14, 15 and 16 forming the sectors of an approximate circular area indicated schematically by line 17. In this case the aperture mask has circular openings and the image cast by the electron beam on phosphor elements 14, 15 and 16 has in its zero or rest position the circular shape schematically indicated in Fig. 2 at 18.
In this case, however, instead of a lateral deflection in one direction only a multi-directional type of deflection is used to reproduce color hues determined by ditferent proportions of color segments 14, 15, 16 covered by the electron image 18 cast by the mask apertures.
In order to achieve this result, in addition to a lateral movement indicated by arrows 12, 13 the electron beam and the corresponding image 18 is caused to execute a perpendicular movement as indicated perpendicular to arrows 12, 13 under control of corresponding circuits and color component information and color selection defiection plates similar to those shown with respect to Fig. 1 and a two-color reproduction system.
Fig. 3 shows the invention as applied to a two-color system which is somewhat improved in color rendering by the addition of a third color strip of well-defined dimension and structure, or by subdivision of one of the twocolor strips shown in Fig. 1 into two strips, or by replacing the color separation line between adjacent color strips, by a third color strip of predetermined width and structure as indicated for example in Fig. 3 by arranging an orange color strip 19 between cyan and magenta color strips 20, 21 with the mask image being indicated at 22 in an operating position depending upon the position of the electron beam.
In this case, as well as in the case of two-color reproduction, the white balance can be adjusted in accordance with the invention by adjusting the zero rest position of the electron image 18 on color segments 14, 15, 16.
In Fig. 4 an apparatus is illustrated to operate a tele-. vision system such as shown in Fig. 1.
The various elements of the color reproducer are only shown as far as they have any bearing on the invention.
The standard color signals derived from a transmitter and received at the receiver antenna, after corresponding amplification and separation are divided into hue and luminance Signals in otherwise well known manner.
The hue signals are demodulated at 23 in a manner also otherwise well known or as indicated in greater de tail in Figs. and 6,'and separated into orange-red video signals at 24 and into cyan video signals at 25.
The outputs of stages 24 and 25 are respectively applied over lines 26, 27 to opposite deflection plates 23, 29 of cathode ray tube 30 causing the displacement of the axis of electron beam 31 derived from gun 32 in accordance with the invention, so as to cause movement of the electron picture image produced by openings 33 of aperture mask 34 of otherwise-well-kno-wn structure or of a structure such as disclosed in the above-mentioned copending patent application, on the adjacent pairs of At the same time electron beam 31 is caused to be periodically deviated with the aid of perpendicular electromagnetic deflection coils or systems 38,39 under control of synchronizing signals in otherwise Well known manner to efiect scanning of screen 37 as is well known in the art of operation ofcathode ray tubes.
Luminanceinformation is derived from amplifier 40 and applied over line- 41 to grid, 42 of cathode ray tube 30, so as to effect simultaneously with the changes in color hue the appropriate changes in intensity.
Electron beam 31 is produced in otherwise well known manner by a single cathode 41 which focuses electron beam 31 on screen 37. I
In accordance with this invention electrostatic deflection plates 28, 29 are arranged concentric with respect to the axis or cathode ray tube 30 so as to produce a beam intersecting the axis of the beam when it is not displaced; this intersection will occur at a point substantially at or near aperture mask 34. i I
Electrostatic deflecting plates 28, 29 may be replaced by 7 other deflecting means such as electromagnetic deflecting coils without departing from the scope of the invention.
Further in accordance with the invention the white balance of the color system depends on the bias voltage applied to at least one of displacement plates 28, 29 or as indicated in Fig. 4 between displacement plates 28, 29. This bias is derived from a potentiometer 43, adjustment of which will adjust the white balance in accordance with the invention.
This balance may also be effected by a magnetic field applied transversely in the vicinity of plates 28, 29 by,
means of an external electroor permanent magnet struc-.
' ture, 28', 29.
A demodulation circuit such as shown in Fig. 4 at 23 isdescribed in detail in Fig. 5, involving a single tube 44 of the sheet beam or beam-sharing type in which electron beam. 45 after modulation is shared by two or more anodes 46, 47 under control of deflecting electrodes 43, 49 to which an appropriate source of synchronous reference signals is applied.
Thus the same electrode structure serves simultaneously to perform the function of synchronous demodulation and amplification in separate channels 50, 51 which are connected'respectively to color selection deflecting plates 28, 29.
The varying electron current derived from beam 45 is used to produce a varying voltage across load" resistors 52, 53 and across a portion of white balance potentiometer 54, which also establishes the relatively static direct current potential of anodes 46, 47 and deflecting electrodes 28, 29.
In the modification of Fig. 6 separate demodulation and amplification circuitstare shown.
In Fig. 6 the diodes 55', 56 which may be of germanium, silicon or vacuum type, are excited by the reference oscillator circuit 57 in degrees phase displacement. Diodes 55, 56 therefore conduct for some part of the cycle, preferably over 5 or 10 degrees, and are biased through resistors SS, 59 to nonconduction for the remainder of the cycle.
The chroma signal therefore appears during this interval (of say 5 degrees) across the 10,000 ohm video load 58, 59.
The 3.56 mc. tuned circuit 60, 61 isolates the reference signal from the grids of twin amplifier 63, preventing biasing due to rectification.
The .25 mfd. capacitors 64, 65 block the direct current rectified by the diodes '55, 56 and prevent biasing of video amplifiers 63.
While the direct current component of the demodulated video signals is thereby removed from the output of amplifiers 63, it has been found that a sufliciently long time constant permits little loss of the significant chroma information.
In other respects the output circuit of, video amplifiers 63 resembles that of Fig. 5.
The invention is not limited to the, tubes and tube elements shown and described nor to the. circuits and circuit elements shown and described but can be applied in any form or manner whatsoever without departing from the scope of this disclosure. Y
I claim:
1. In combination, a number of juxtaposed phosphor elements of alternatingly diflerent primary color reproduction, an aperture mask in alignment therewith, means for directing an electron beam through said aperture mask to impinge upon said phosphor elements'in the form of a shadow extending over the width of at least one of said elements, means for deflecting said electron beam under control of synchronizing pulses to provide a display raster on said elements, means for displacing the ,axis or said electron beam under control of composite color information pulses so as to produce a displaced beam having an axis intersecting the axis of said beam when in rest position at said aperture mask, thereby causing said shadow to be shared simultaneously by adjacent primary color elements to reproduce said composite color, said displacing means including electrostatic deflecting means and a beam deflection demodulating tube, said demodulating tube having a pair of anodes controlling said. deflecting means, a control electrode under control of the undemodulated chrome signal and a pair of deflection electrodes under control of local reference signals. 7
2. In combination, a number of juxtaposed phosphor elements of alternatingly difierent primary color reproduction, an aperture mask in alignment therewith, means for directing an electron beam through said aperture mask to impinge upon said phosphor elements in the form of a shadow extending over the width of at least one of said elements, means for deflecting said electron beam under control of synchronizing pulses to provide a display raster on said elements, means for displacing the axis of said electron beam under control of composite color information pulses so as to produce a displaced beam having an axis intersecting the axis of said beam when in rest position at said aperture mask, thereby causing said shadow to bev shared simultaneously by adjacent primary color elements to reproduce said composite color, said displacing means including a pair of demodulating diodes under control of the undemodulatedi chrome input, a pair of separate amplifier means controlled by said diodes, a pair of electrostatic plates controlled by said amplifier means, and input means under control of local reference signals being inserted between said diodes and said amplifier means to apply synchronous signals in opposite phase relationship.
(References on followingfpage) References Cited in the file of this patent Re. 23,838 Re. 23,964 2,307,188 2,663,757 2,672,575 2,679,614
UNITED STATES PATENTS Rajchman June 8, 1954 Jenny Mar. 22, 1955 Bedford Jan. 5, 1943 Lubcke Dec. 22, 1953 Werenfels Mar. 16, 1954 Friend May 25, 1954 Fyler Sept. 28, 1954 Law Dec. 7, 1954 Skellett June 14, 1955 Lawrence June 21, 1955 Scull Dec. 20, 1955 Moore Dec. 4, 1956 Benway Feb. 19, 1957 Jurgens Aug. 20, 1957
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Cited By (1)

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US3444421A (en) * 1965-12-27 1969-05-13 Sony Corp Cathode ray tube

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US2307188A (en) * 1940-11-30 1943-01-05 Rca Corp Television system
US2663757A (en) * 1950-03-06 1953-12-22 Gen Teleradio Inc Television apparatus
US2672575A (en) * 1951-10-11 1954-03-16 Rca Corp Apparatus for reproducing images in color
US2679614A (en) * 1952-09-17 1954-05-25 Rca Corp Beam-controlling system for tricolor kinescopes
USRE23838E (en) * 1950-09-14 1954-06-08 Post-deflected color kinescope
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube
US2696571A (en) * 1950-02-10 1954-12-07 Rca Corp Color kinescope
USRE23964E (en) * 1950-06-27 1955-03-22 jenny
US2710890A (en) * 1950-06-01 1955-06-14 Nat Union Radio Corp Dot-screen type color television apparatus
US2711493A (en) * 1951-06-29 1955-06-21 Chromatic Television Lab Inc Direct-view color tube
US2728027A (en) * 1952-08-12 1955-12-20 Rca Corp Cathode ray deflection systems
US2773118A (en) * 1953-07-27 1956-12-04 Philco Corp Television deflection control system
US2782333A (en) * 1954-08-18 1957-02-19 Rca Corp Shortened triple gun for color television
US2803781A (en) * 1952-08-13 1957-08-20 Philips Corp Device comprising a cathode-ray tube

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Publication number Priority date Publication date Assignee Title
US2307188A (en) * 1940-11-30 1943-01-05 Rca Corp Television system
US2696571A (en) * 1950-02-10 1954-12-07 Rca Corp Color kinescope
US2663757A (en) * 1950-03-06 1953-12-22 Gen Teleradio Inc Television apparatus
US2710890A (en) * 1950-06-01 1955-06-14 Nat Union Radio Corp Dot-screen type color television apparatus
USRE23964E (en) * 1950-06-27 1955-03-22 jenny
USRE23838E (en) * 1950-09-14 1954-06-08 Post-deflected color kinescope
US2711493A (en) * 1951-06-29 1955-06-21 Chromatic Television Lab Inc Direct-view color tube
US2672575A (en) * 1951-10-11 1954-03-16 Rca Corp Apparatus for reproducing images in color
US2728027A (en) * 1952-08-12 1955-12-20 Rca Corp Cathode ray deflection systems
US2803781A (en) * 1952-08-13 1957-08-20 Philips Corp Device comprising a cathode-ray tube
US2679614A (en) * 1952-09-17 1954-05-25 Rca Corp Beam-controlling system for tricolor kinescopes
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube
US2773118A (en) * 1953-07-27 1956-12-04 Philco Corp Television deflection control system
US2782333A (en) * 1954-08-18 1957-02-19 Rca Corp Shortened triple gun for color television

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444421A (en) * 1965-12-27 1969-05-13 Sony Corp Cathode ray tube

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