US2730653A - Cathode-ray tube for reproducing coloured television images - Google Patents

Cathode-ray tube for reproducing coloured television images Download PDF

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Publication number
US2730653A
US2730653A US343139A US34313953A US2730653A US 2730653 A US2730653 A US 2730653A US 343139 A US343139 A US 343139A US 34313953 A US34313953 A US 34313953A US 2730653 A US2730653 A US 2730653A
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United States
Prior art keywords
luminescent
cathode
electrode
layer
potential
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Expired - Lifetime
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US343139A
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English (en)
Inventor
Schagen Pieter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2231/00—Cathode ray tubes or electron beam tubes
    • H01J2231/12—CRTs having luminescent screens
    • H01J2231/121—Means for indicating the position of the beam, e.g. beam indexing

Definitions

  • the Astrips enter into each other like combs and current may be supplied to the back of the combs.
  • the connections i 2,730,653 Patented Jan. 10, 1956 may ,be established as 'described hereinbefore for v'two groups of strips, butparticular measures. lare required for the group of strips for the third colour.
  • connection may be made across thegside,Y all the strips being connected .in series.” However, this produces a heavy resistance between points of connection andthe strips' vw'dely remote therefrom.
  • the connectionsof the strips may cross each other in an insulated manner. However, this produces excessiveV capacity between. the electrodes of different colours. l
  • a further alternative method enables in a simple manner, without the use of complicated electrode structures, to cause a screen comprising a plurality .of luminescent materials to emit a denite colour by varying the potential of a single electrode, the luminescent screen being constituted by a plurality of superposed'l'ayers luminescing in. different colours.
  • Atpthat 4side of such a screen which is more remote yfrom the cathode provision is made of an electrode to which varying potentials are applied.
  • the thicknesses and the electron permeabilities of lthe luminescent layers are ⁇ such, that on ⁇ the potentials of the electrodes arrangedl behind the screen being Varied the electrons penetrate one, two or'more layers.
  • the two systems describedhereinbefore have an yadditional limitation in that the necessary variation of the potential of the electrode to which the luminescent material is applied causes the deection of the Yelectron Vbeam to varyas well. To provide compensation for this the deecting potential is required to be varied in the rhythm of the vpotential variations of the above mentioned electrodes.
  • the object of the invention is to obviate the above mentioned disadvantages of known systems by a different structure of the luminescent screen and theV associated electrodes.
  • a cathode-ray tube for reproducing coloured television images has an electrode system including a luminescent screen, and is characterized in. that at the cathode side of this screen provision is made of agrid-shaped electrode which at the observed side is coated with a. material whichby the bombardment of electrons luminesces in colour other than the lrst-men- .tionedluminesceut screen and in that at the observer side of the grid-shaped electrode provision is made of a field electrode.
  • a cathode-ray tube The operation of a cathode-ray tube according to the invention is based on that the field electrode may have supplied to ⁇ it an alternating voltage which either sends back the* electrons to the grid-shaped electrode, where they excite the luminescent material provided on it, or sends the electrons to the luminescent material provided on the screen.
  • the luminescent screen there are still several possibilities of constituting the luminescent screen and arranging the field electrode, since this electrode may be arranged before, in or behind the luminescent screen. Being arranged between the luminescent grid-shaped electrode and the observer it is required either to be grid-shaped or to consist of ametal layer which is permeable to light and consequently also to electrons.
  • the luminescent screen may be constituted either by the comb described hereinbefore or by the above described construction comprising two superposed 'luminescent layers. If two primary colours are considered sufficient, the constructionV is very simple indeed, but even in the -c'as'e of three'primary colours thestruetural4 difiiculties l'maybe readily overcome and highly satisfactory colour reproduction is obtainable.
  • the luminescent material may be rendered sutciently conductive, for example by mixing it with a metal, forV enabling the potential to be applied to'thescreen itself.
  • the lield electrode may be combined with lthe luminescent screen so'as to form a single unit.
  • Fig. 1 is'an elevation and a partial cross-section of a cathode-ray tube using two primary colours
  • Fig. 2 is a detail-view of the tube according to Fig. 1; Y'
  • Fig. 3 shows an alternative embodiment of the screen construction according to Fig. l;
  • Fig. 4 is a detail-view of a modified construction of a tube according to Fig. l;
  • Fig. 5 is a detail-view of a tube using three primary colours
  • Fig. 6 is a detail-view of a cathode-ray tube in which a comb-shaped construction of the luminescent screen is used.
  • the reference numeral 1 desv ignates the envelope of a cathode-ray tube, which has a glass end face or window 2.
  • a transparent conductive layer 3 which is made for example of conductive tin oxide.
  • this layer is coated with a luminescent layer 4.
  • a grid-shaped electrode 5 is arranged in front of this layer 4 andslightly spaced away from it. As may be seen more clearly from Fig. 2, this grid-shaped electrode is coated at its side more remote from the cathode with a luminescent material 6, which by the bombardment of electrons emits light of a colour diierent from that emitted by the layer 4.
  • the operation of the tube may be readily explained with reference to Fig. 2.
  • the beam-forming system comprises a cathode 30, a control grid 31 and an anode 32, all connected to a suitable D.C. potential source 33.
  • the electrode 5 has a definite potential applied to it, for example by connecting it to the anode ofthe electrode system which ensures the production of the beam.
  • the electrode 3 is provided with a terminal to permit a definite potential from a square wave A.C. source 34 to be applied to it. When this potential is sufliciently negative with respect to the electrode 5, the electrons passing through the grid 5 will turn back before being capable of reaching the layer 4, so that they strike the luminescent material 6 and thus produce light.
  • the luminescent layer 4 When the potential of the electrode 3 is higher than the potential of the grid 5, the luminescent layer 4 will be struck and emit light. Varying the potential of the electrode 3 consequently permits of generating either light having the colour which the material 6 is able to emit or light having the colour which the material of the layer 4 is able to emit.
  • the luminescent material 8 is coated on a transparent underlayer 7. At the cathodes side this material 8 is coatedwith a conductive layer 9 which fulfills the same function as the layer 3 of Figs. 1 and 2.
  • the grid-shaped electrode is designated by the reference numeral 10 and the luminescent material provided on it by the reference numeral 11. Since the layer 9 is required to be permeable to light it is naturally also permeable to electrons.
  • Fig. 4 shows an embodiment which is similar to the one shown in Fig.' 3 except for the conductive layer 9 shown in Fig. 3 which is replaced by a grid-shaped electrode 12 acting in quite the same manner.
  • the underlayer of the screen, the luminescent layer coated thereon, the grid-shaped electrode and the luminescent material Fig. 5 is a detail-view of a discharge tube for the emission of coloured images with the use of three primary colours.
  • the transparent support 17 of the luminescent screen is coated with a light-transmitting conductive layer 18.
  • This field electrode is coated at the Vcathode side with a layer of luminescent material 19 which by bombardment of electrons emits a definite colour.
  • This layer is provided with a second luminescent layer 20, which on being struck by electrons luminesces in colour other than the material of the layer 19.
  • the reference numeral 21 designates the grid which is arranged in front of the screen and is coated on the side more remote from the cathode with a ⁇ luminescent material 22 which emits light of a color other than emitted by the layers 19 and 20 respectively. lf the layer 18 has applied to it a potential which is suiiciently below the potential of the electrode 21 for the electrons passing through the grid to return, the electrons are enabled to excite the material 22. If
  • the potential of the electrode 18 exceeds the potential of the grid 21, it lis possible for the electron beam to reach the layer 20 and to excite it, the electrons being braked and absorbed. If the potential of the electrode 18 is very high, it will be possible for the electrons to penetrate the layer 20 and to excite the layer 19. At a less high potential substantially all the electrons will be absorbed in the layer 20 and consequently the layer 19 will not emit light. As mentioned hereinbefore, such a screen consisting of two superposed luminescent layers enables a highly satisfactory, only slightly contaminated colour image to be obtained. Generally for this purpose the layer 20 will be required to be much thinner than the layer 19 and the luminescent materials will be such that the layer 19 emits green light, the layer 20 red light and the layer 22 blue light.
  • Fig. 6 is a detail-vew on a large scale of a cathode-ray tube which acts with a comb-construction of the luminescent screen.
  • the reference numeral 23 designates the y grid-shaped electrode, which at its side more remote from the cathode is coated with a luminescent material.
  • the reference numeral 24 designates a transparent Acombshaped electrode which is coated with a luminescent mav terial which by the bombardment of electrons emits light of a colour other than that emitted by the material on the grid 23.
  • the reference numeral 25 designates a combshaped electrode which is also transparent and which at the cathode side is coated with a third luminescent material.
  • the operation of this cathode-ray tube may be described as follows.
  • the grid 23 is at a definite positive potential. When both the electrodes 24 and 25 are nega- Y23 through the intermediate spacing.
  • the grid 23 may be adequately fine meshed to permit the luminescent screen 23 to be observed through every slit between the electrodes 24 and 25. If desired this permits of the electrodes 24 and 25 being impermeable to light but permeable to electrons and being coated with the luminescent materials at the side more remote from the cathode. In this event the light of the electrode 23 is visible through the slits only. Any colour contamination is thus prevented.
  • a cathode-ray tube for reproducing color television images comprising an electron gun including a cathode, a transparent support facing said cathode, a rst layer of luminescent material lnrninescing in a first color disposed on the side of said support facing said cathode, a second layer of luminescent material luminescing in a second color superposed on said first layer, a grid-like electrode disposed between said luminescent layers and said cathode and in close proximity to the former, a third layer of luminescent material luminescing in a third color disposed on the side of said grid electrode facing said first and second luminescent layers, and a field electrode disposed between said third layer and said transparent support.
  • a system comprising a cathode-ray tube for reproducing color images comprising an electron gun including a cathode and anode, a transparent support facing said cathode, a first layer of luminescent material luminescing in a rst color disposed on the side of said support facing said cathode, a second layer of luminescent material luminescing in a second color superposed on said tirst layer, a grid-like electrode disposed between said luminescent layers and said cathode and in close proximity to the former, a third layer of luminescent material luminescing in a third color disposed on the side of said grid electrode facing said first and second luminescent layers, and a field electrode disposed between said rst rayer and said transparent support, a source of direct current potential, means for applying a given positive potential to said anode and the same positive mobility to said grid electrode, a source of alternating current potential, means for applying an alternating current potential to said vlield electrode including a

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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)
US343139A 1952-04-17 1953-03-18 Cathode-ray tube for reproducing coloured television images Expired - Lifetime US2730653A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL737030X 1952-04-17

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US2730653A true US2730653A (en) 1956-01-10

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US (1) US2730653A (en(2012))
BE (1) BE519220A (en(2012))
FR (1) FR1085043A (en(2012))
GB (1) GB737030A (en(2012))
NL (1) NL168855B (en(2012))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967262A (en) * 1956-07-30 1961-01-03 Madey Richard Multi-color display tube
US3005124A (en) * 1957-04-11 1961-10-17 Kaiser Ind Corp Electronic device
US3204143A (en) * 1961-05-08 1965-08-31 Rca Corp Penetration color screen, color tube, and color television receiver
US4612483A (en) * 1982-10-22 1986-09-16 U.S. Philips Corporation Penetron color display tube with channel plate electron multiplier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461515A (en) * 1945-07-16 1949-02-15 Arthur B Bronwell Color television system
US2580073A (en) * 1948-05-01 1951-12-25 Bell Telephone Labor Inc Time multiplex television in color
US2590764A (en) * 1950-02-23 1952-03-25 Rca Corp Color television image tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461515A (en) * 1945-07-16 1949-02-15 Arthur B Bronwell Color television system
US2580073A (en) * 1948-05-01 1951-12-25 Bell Telephone Labor Inc Time multiplex television in color
US2590764A (en) * 1950-02-23 1952-03-25 Rca Corp Color television image tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967262A (en) * 1956-07-30 1961-01-03 Madey Richard Multi-color display tube
US3005124A (en) * 1957-04-11 1961-10-17 Kaiser Ind Corp Electronic device
US3204143A (en) * 1961-05-08 1965-08-31 Rca Corp Penetration color screen, color tube, and color television receiver
US4612483A (en) * 1982-10-22 1986-09-16 U.S. Philips Corporation Penetron color display tube with channel plate electron multiplier

Also Published As

Publication number Publication date
BE519220A (en(2012))
GB737030A (en) 1955-09-21
NL168855B (nl)
FR1085043A (fr) 1955-01-26

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