US2590018A - Production of colored images - Google Patents
Production of colored images Download PDFInfo
- Publication number
- US2590018A US2590018A US191862A US19186250A US2590018A US 2590018 A US2590018 A US 2590018A US 191862 A US191862 A US 191862A US 19186250 A US19186250 A US 19186250A US 2590018 A US2590018 A US 2590018A
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- US
- United States
- Prior art keywords
- layers
- layer
- screen
- producing
- color
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
- H04N9/27—Picture reproducers using cathode ray tubes with variable depth of penetration of electron beam into the luminescent layer, e.g. penetrons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/251—Mica
Definitions
- This invention relates t0. the production of colored images as in color television, color radar and the like. More particularly, it relates to a cathode ray tube for producing color: efiects and to the. colored light. producing screen employed therein.
- An object of this invention is.t.0 produce an improved colored image producing screen.
- Another object is to provide a colored image producing screen in which the colored image is characterized by increased brightness.
- a further object of the invention is, to provide such a screen which will operate at relatively lower electron beam exciting potentials than heretofore.
- a still further object is to provide such. a. screen which has enhanced voltage-brightness charac teristics.
- Another object of the present invention is to provide. such a screen which provides increased sharpness of color separation.
- Another object is. to produce such a screen in which the image is reproduced in purer colors.
- Another object of the invention is to provide such a screen which will faithfully reproduce the true colors of an object.
- a further object is to provide a cathode, ray tube for accomplishing the above objects.
- a still further object of the invention is to provide a colored. image system. for the realization of the above objects.
- Fig. 1 shows a cross-section of a portion of the colored image, producing: screen of the present invention
- Fig. 2a is a plot of brightness versus electron. beam voltage: for a gross liquid-settled three color screen
- Fig. 2b is a similar plot for a flotation type screen of the present invention
- Fig. 2c is a similar plot for a flotation type three color screen of the present invention having between the layers thereof electron absorbin barriers
- Fig. 31 is a spectograin plot of sucha screen at three: difierent electron beam potentials illustrating the purity of colors obtainable using the. present invention
- Fig. l shows a typical circuit in connection with which the presentscr'een may be employed.
- anflimproved cathode ray. tube screen for the productionof colored images may be made by providing a plu- 3 rality of mono-particle thick layers of different colored light producing luminescent materials or phosphors, the thickness of each layer being such that the maximum excitation is obtained with the electron beam to which it is sensitive.
- the layers are separated by light transparent, electrically non-conductive barriers which are capable of absorbing electron energy.
- the principle upon which this invention is based is that the penetration of electrons emitted from any source, such as an electron gun in a cathode ray tube, depends upon their velocity which varies as the square of their potential. With a given material to be penetrated, the-higher the impinging velocity or potential, the greater is the electron penetration. It is also known that an electron beam gives up most of its energy at a particular depth in the material. If, then, three layers of phosphors, each of which produces a difierent colored light upon excitation, are superimposed one upon the other to form a composite screen, a potential or voltage may be applied to electrons impinging on the screen to cause them to penetrate to any desired depth and then give up most of their energy.
- the light produced is mainly the color of the light produced by the phosphor layer in which most of the energy of the electron beam is lost with some color from other layers in which energy is absorbed.
- the color emitted is red.
- the color is mainly blue with some red, depending on how much of the energy is absorbed in the first, red layer.
- the electron beam is adjusted to lose most of its energy in a third, green light producing phosphor layer, the resultant color is mainly green. The amount of red and blue color depends again on the energy absorbed in the first and second layers.
- the layer in order to obtain similar brightness response to the electron beam throughout the expanse of any one phosphor layer, the layer should be of uniform thickness. At the same time it should be continuous and thin enough to enable selective excitation by electron beams of low intensity.
- Typical red colored light producing phosphors which may be used, among others, are zinc-cadmium sulphide, magnesium silicate, magnesium germinate, and magnesium phosphate; typical blue phosphors are zinc sulphide and calcium magnesium silicate, while typical green phosphors are willemite or zinc orthosilicate and magnesium aluminate.
- red, blue, and green phosphors which are, respectively, 2.8 microns, 6.1 microns, and'19.3 microns thick the layers may be excited by electron beams of lOjkilovolts, 18 kilovolts, and 32 kilovolts in that order.
- the red, blue, and green layers are 0.5;, 4.1 1, and 29 thick they are excited by electrons having potentials of 6 kilovolts, l2 kilovolts, and 25 kilovolts.
- the thicknessof the phosphor next to the base of the screen is immaterial so long as it is thick enough to absorb all the energy in any electron beam impinging upon it. In the present instance this is the green phosphor.
- Mono-particle thick layers of phosphors are further of great advantage in that their extreme thinness and'smoothness makes possible a more abrupt change in color with change in voltage.
- the purity of the colored light produced by any one layer when excited by an electron beam may be enhanced by placing light transparent, electrically non-conductive, electron energy absorbing barriers or layers between the phosphor lay r These lay rs serve to absorb a certain amount of the energy of the electron beam and may be so adjusted in thickness as to insure that any particular phosphor layer beyond the barrier and farther from the electron beam source is subjected to electrons having a potential with a definite lower voltage or potential limit.
- the barriers provide a certain critical voltage below which there I is 'no excitation of the succeeding phosphor layer.
- the energy loss for l5ikilovolt electrons is about 7.5 kilovolts while for 40 kilovolt electrons the loss is about 2.4 kilovolts.
- Silica is typically used in thinner layers than mica, down to about 0.1 thick. For such a layer the energy absorbed is somewhat less than that lost in the above-mentioned mica layer.
- FIG. 1 A partial cross-sectional view of a composite screen made up of various mono-particle thick layers is shown in Fig. 1.
- the composite phosphor screen is laid on glass base I which may be fiat or have any desired radius of curvature.
- the red, blue, and green light producing phosphors are laid in inverse order on the glass base, that is, the green layer 2 is laid adjacent the base, the blue layer 3 next, and the red layer 4 next.
- Light transparent, non-conductive or insulating barriers 5 and 6 are preferably placed respectively between the red and blue and blue and green layers.
- Phosphor layers 3 and 4 are one particle thick and a particle size is selected for each layer which will permit the absorption of the proper amount of the energy of an electron beam to giv the desired brightness.
- Phosphor layer 2 need not be a mono-particle thick layer, but may be liquid-settled to a thickness which will preferably absorb all electron energy entering it.
- an electron energy entering it Preferably, though not necessarily, an electron energy
- aluminum film l is placed over the outermost layer 4 of phosphor. This aluminum film serves to drain ofi any electrostatic charge which may tend to accumulate on the phosphor screen. It also serves to reflect light which otherwise would be diverted to the interior of the cathode ray tube of which the screen is a part, and reduces halation efiects.
- Figs. 2a-2c The advantages of the present mono-particle phosphor layers, and particularly the present mono-particle layers having electron energy absorbing layers therebetween, over ordinary gross phosphor layers will be made clear by reference to Figs. 2a-2c.
- the screen of Fig. 2a is a three color red, blue, and green phosphor screen with the green phosphor laid next to the glass base by the usual, liquidsettling method to a density of 4.5 mg. per cm. the particles averaging under 6; in size, and the blue, and redphosphors laid in the same manner successivelyabove it in that order.
- electron beam voltages up at 25 kilovolts, as shown in Fig. 20. only the red phosphor emitted any color. No color trace was visible for the blue or green phosphors.
- the screen of Fig. 2b was laid down in the same order as in Fig. 2a. However, only the green phosphor was formed by liquid-settling means to a density of 4.5 mg. per cm. for particles averaging less than 6 in size.
- the blue and red phosphor layers were laid down by the flotation method mentioned elsewhere herein and consisted of substantially continuous, monoparticle thick layers of particles averaging less than 6 in size. The advantage of the monoparticle thick layers over the gross layers of Fig.
- Fig. 20 represents similar data for a screenlike that of Fig. 2b except that silica barriers about 1 thick were placed between the red and blueand the blue and green mono-particle thick Itwill be noted that.
- Fig- 2c that the effect of the barrier was to displace the oscillograph traces somewhat to the right. Thus,- at 13 kilovolts the brightness of the blue. color emission was only about 37 per cent of that of the red emission and the brightness of the green color was only 13 per cent of that. of thered.
- the electron beam potential increased, the: preponderance of red decreased being displaced by a blue emission which was increased more rapidly in brightness over the green by meansof the barrier. As the potential was stillfurther-increased, the green emission likewise increased more rapidly in brightness than when no barrier was present.
- the present mono-particle thick multi-layer screen permits the production of a plurality of colors at electron, beam potentials under 25 kilovolts whereas the gross layer screens will produce at such voltages only the color ofthe first layer impinged upon.
- the presence of electron energy absorbing barriers between the phosphor layers further improves the purity of the colors in that as the electron beam potential increases the preponderance of red emission .decreases.
- Another beneficial efiect of the present barriers is that, should voids be present to a very slight extent between phosphor particles, the barrier layers absorb enough electron. energy to insure that a false color is not produced.
- an electron beam meantto excite a particular layer but which strikes a void. space between the configuration of the particles in the mono-particle thick layer proceeds unhindered to the next layer to excite a successive layer not intended to be excited. The result is that regions of one color are interposed with foreign colors which detract from the quality of the image reproduced.
- their thickness may be so adjusted that energy is absorbed in them to the. extent that the succeeding layer of phosphor is not excited except by a voltage which is enough higher so that undesirable interference of. colors is obviated.
- Fig. 3 shows typical results obtained with mono-particle laymally of a density of 4.5 mg. per cm.
- the grainsize of the phosphors making up the present layers determines the electron beam potentials at which they operate. For example, with red, blue, and green phosphor particle sizes of 2.8, 6.1, and 19.3 microns, respectively, the exciting electrons are 10, 18, and 32 kilovolts in that. order. With red, blue, and green monoparticle layers 0.5, 4.1, and 29 microns thick the corresponding electron voltages are 6, 12, and 25. In allcases the silica barriers used between phosphor layers were about two or three microns thick.
- the thickness of the layer next to the glass surface is not of importance so long as it blocks the passage of all electrons. While this layer may be of monoparticle structure, it may also be laid down by any of the usual settling processes and is nor- Usually the phosphor layers are formed on the glass with the phosphor of the highest efficiency lowermost and the others superimposed thereon I in decreasing order of efficiency. In the present examples this order has been green, blue, and red with the electron beam striking the layers in inverse order.
- Fig. 4 shows schematically a color television receiving unit. It will be understood, of course, that this particular arrangement is shown not in a limiting sense, but merely for purposes of illustration. It will also be understood that the present screen may be used wherever it is desired to convert electrical pulses into color; typical examples being radar and television.
- Fig. 4 for a typical example of the operation of the present colored image producing fluorescent screen when used in a cathode ray tube as part of a television system which for the most part is shown schematically.
- Cathode ray tube H has an evacuated envelope l2 containing an electron gun l-3, a deflecting system M, semiconductive coating l5, and screen [6. Electrons emitted by cathode I! are controlled and focussed by control grid l8, attracted by first anode l9 and further accelerated toward screen 16 by semiconductive coating l5 which acts as a second anode. The electron beam is aimed at the desired point on screen i 5 by means of deflecting system M which comprises horizontal deflecting coil 20 and vertical deflecting coil 2
- the incoming signal is intercepted by the antenna 22 and converted to an intermediate frequency by means of the high frequency oscillator in receiver 23.
- the signal is usually further amplified in an intermediate freequencyamplifier, not'shown, to a level suitablefor detection.
- the signal amplified in video amplifier 24 to a proper level and applied to the control grid I8 of cathode ray which supplies timing pulses to a high voltageswitching unit 29 which in turn furnishes color signals to the post deflection electrode 30 at screen it to produce the proper sequence of colors.
- the present system may be applied to any type of cathode ray tube as is well known to those skilled in the art. While the present invention has been describe with particular reference to a color television system, it will be appreciated that it may be applied to any equipment in which it is desired to give a precise varied color indication in 'a. cathode ray tube. Colored radar is an example of another application of the invention.
- a multi-layer colored image producing mmmes-j cent screen which is characterized by faithful. reproduction of colors at relatively low electron beam potentials and with a low voltage drop across the phosphor layers.
- the mono-particle thick multi-layer screen is further characterized by enhanced brightness and a minimum of in ray tube and a television system for utilizing:
- a cathode ray tube screen for producing colored images comprising a plurality ofuniform, mono-particle thick, continuous layers of differ ent colored light-producing material, said layers being separated by films which, absorb a part, only of any electron energy passing therethrough.
- a cathode ray tube screen for producing colored images comprising a plurality of uniform, mono-particle thick, continuous layers of dif-' ferent colored light-producing material, said layers being separated by films consistin 01f silica for absorbing a portion only of any electron energy passing therethrough.
- a cathode ray tube screen for producing colored images comprising a plurality of uniform, mono-particle thick, continuous layers of different colored light-producing material, said layers being separated by films consisting of mica for absorbing a part only of any electron energy passing therethrough.
- a cathode ray tube screen for producing colored images comprising a plurality of uniform, mono-particle thick, continuous layers of different colored light-producing material, said layers being separated by films consisting of alkali silicate for absorbing a part only of any electron energy passing therethrough.
- a cathode ray tube for producing colored images comprising an envelope containing electron beam producing means, means for controlling the potential of said beam, and an image screen comprising a plurality of uniform, monoparticle thick layers of phosphors capable of producing difierent colors under electron beam excitation, said layers being separated by films which absorb a part only of any electron energy passing therethrough.
- a cathode ray tube for producing colored images comprising an envelope containing electron beam producing means, means for controlling the potential of said beam, and an image producing screen comprising a plurality of uniform, mono-particle thick layers of luminescent material, each layer being capable of producing a particular color under electron beam excitation, said layers being separated by films which absorb a part only of any electron energy passing therethrough.
- a cathode ray tube for producing colored images comprising an envelope containing electron beam producing means, means for controlling the potential of said beam, and an image producing screen comprising a plurality of uniform, mono-particle thick layers of luminescent material, each layer being capable of producing a particular color under electron beam excitation, said layers being separated by films consisting of silica for absorbing a portion only of any electron energy passing therethrough.
- a cathode ray tube for producing colored images comprising an envelope containing electron beam producing means, means for controlling the potential of said beam, and an image producing screen comprising a plurality of uniform, mono-particle thick layers of luminescent 10 material, each layer being capable of producing a particular color under electron beam excitation, said layers being separated by films consisting of mica for absorbing a part only of any electron energy passing therethrough.
- a cathode ray: tube for producing colored images comprising an envelope containing electron beam producing means, means for control-' ling the potential of said beam, and an image producing screen comprising a plurality of uniform, mono-particle thick layers of luminescent material, each layer being capable of producing a particular color under electron beam excitation, said layers being separated by films consisting of alkali silicate for absorbing a part only of electron energy passing therethrough.
- a color television system comprising a cathode ray tube comprising an envelope containing electron beam producing means, means for controlling the potential of said beam, and an image screen comprising a plurality of uni: form, mono-particle thick layers of luminescent materials capable of producing different colors under electron beam excitation, said layers being separated by films which absorb a part only of any electron energy passing therethrough.
- a color television system comprising a cathode ray tube comprising an envelope containing electron beam producing means, means for controlling the potential of said beam, and an image screen comprising a plurality of uniform, mono-particle thick layers of luminescent materials capable of producing different colors under electron beam excitation, said layers being separated by films which absorb a part only of any electron energypassing therethrough.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Luminescent Compositions (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE519111D BE519111A (pt) | 1950-10-24 | ||
BE508900D BE508900A (pt) | 1950-10-24 | ||
BE506607D BE506607A (pt) | 1950-10-24 | ||
US191862A US2590018A (en) | 1950-10-24 | 1950-10-24 | Production of colored images |
GB24103/51A GB701853A (en) | 1950-10-24 | 1951-10-16 | Improvements in and relating to cathode ray tube screens for the production of coloured images |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US191862A US2590018A (en) | 1950-10-24 | 1950-10-24 | Production of colored images |
Publications (1)
Publication Number | Publication Date |
---|---|
US2590018A true US2590018A (en) | 1952-03-18 |
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ID=22707198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US191862A Expired - Lifetime US2590018A (en) | 1950-10-24 | 1950-10-24 | Production of colored images |
Country Status (3)
Country | Link |
---|---|
US (1) | US2590018A (pt) |
BE (1) | BE506607A (pt) |
GB (1) | GB701853A (pt) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2687360A (en) * | 1951-01-18 | 1954-08-24 | Rauland Corp | Process for making a multicolor fluorescent screen |
US2728011A (en) * | 1952-05-01 | 1955-12-20 | Rca Corp | Color television picture and pick-up tubes |
US2730644A (en) * | 1951-04-10 | 1956-01-10 | Hyman A Michlin | Electroluminescent light means |
US2785331A (en) * | 1953-08-24 | 1957-03-12 | Rca Corp | Art of making color-phosphor screens |
DE1012954B (de) * | 1955-02-25 | 1957-08-01 | Reich Robert W | Elektronenstrahlroehre zur Wiedergabe farbiger Fernsehbilder |
US2810013A (en) * | 1953-10-05 | 1957-10-15 | Harry R Lubcke | Color television reproducing systems |
US2827593A (en) * | 1955-04-29 | 1958-03-18 | Gen Electric | High purity color information screen |
US2892116A (en) * | 1956-05-14 | 1959-06-23 | Willer Leila Lea Frank | Color television receiver and picture tube |
US2958002A (en) * | 1952-11-13 | 1960-10-25 | Gen Electric | Production of colored images |
US2967262A (en) * | 1956-07-30 | 1961-01-03 | Madey Richard | Multi-color display tube |
US2992919A (en) * | 1956-12-13 | 1961-07-18 | Gen Electric | Method of making cathode ray tube screens |
US3046154A (en) * | 1957-04-19 | 1962-07-24 | Davohn Corp | Method for forming luminescent screens |
US3099820A (en) * | 1959-03-31 | 1963-07-30 | Bell Telephone Labor Inc | Optical storage system |
DE1172298B (de) * | 1961-05-08 | 1964-06-18 | Rca Corp | Leuchtschirm fuer Farbfernsehbildroehre |
US3231775A (en) * | 1961-12-27 | 1966-01-25 | Rca Corp | Cascaded phosphor layers for color display including one of discrete coherent particles |
DE1225229B (de) * | 1961-05-08 | 1966-09-22 | Rca Corp | Lumineszenzschirm fuer eine Kathodenstrahlroehre zur Wiedergabe bunter Bilder und Verfahren zu seiner Herstellung |
US3290434A (en) * | 1963-07-24 | 1966-12-06 | Polaroid Corp | Color television receiver including display means comprising two uniformly distributed luminescent materials |
US3514287A (en) * | 1961-10-09 | 1970-05-26 | Rca Corp | Photographic method for making tri-colored cathode ray screen |
US3517243A (en) * | 1969-03-17 | 1970-06-23 | Texas Instruments Inc | Color display screen employing two layers of phosphors,particles in the inner layer being small with respect to those in the outer layer and discontinuous in coverage |
US3664862A (en) * | 1969-07-22 | 1972-05-23 | Gen Electric | Electron energy sensitive phosphors for multi-color cathode ray tubes |
US3721849A (en) * | 1971-01-07 | 1973-03-20 | Gte Sylvania Inc | Dual persistence screen for a cathode ray tube |
US4204136A (en) * | 1978-03-17 | 1980-05-20 | Westinghouse Electric Corp. | Dual layer phosphor screen for cathode ray tube |
US4906892A (en) * | 1987-11-13 | 1990-03-06 | Thomson-Csf | High luminance color screen for cathode ray tube and method for making a screen of this type |
Citations (9)
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US2343825A (en) * | 1941-09-06 | 1944-03-07 | Hazeltine Corp | Color-television signal-translating stage |
US2423830A (en) * | 1943-03-25 | 1947-07-15 | Gen Electric | Cathode-ray screen having contrasting colors and unlike rates of decay of luminescence |
US2446248A (en) * | 1946-06-13 | 1948-08-03 | Rca Corp | Phosphor screen |
US2452522A (en) * | 1941-03-18 | 1948-10-26 | Rca Corp | Luminescent screen and method of developing light |
US2455710A (en) * | 1943-12-21 | 1948-12-07 | Rauland Corp | Color television system |
US2461515A (en) * | 1945-07-16 | 1949-02-15 | Arthur B Bronwell | Color television system |
US2472988A (en) * | 1944-10-28 | 1949-06-14 | Scophony Corp Of America | Apparatus for reproducing electric signals, particularly television reproducers |
US2543477A (en) * | 1948-07-29 | 1951-02-27 | Rca Corp | Kinescope for the reproduction of color images |
US2547775A (en) * | 1946-01-23 | 1951-04-03 | Rca Corp | Fluorescent color screen for electron optical systems |
-
0
- BE BE506607D patent/BE506607A/xx unknown
-
1950
- 1950-10-24 US US191862A patent/US2590018A/en not_active Expired - Lifetime
-
1951
- 1951-10-16 GB GB24103/51A patent/GB701853A/en not_active Expired
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2452522A (en) * | 1941-03-18 | 1948-10-26 | Rca Corp | Luminescent screen and method of developing light |
US2343825A (en) * | 1941-09-06 | 1944-03-07 | Hazeltine Corp | Color-television signal-translating stage |
US2423830A (en) * | 1943-03-25 | 1947-07-15 | Gen Electric | Cathode-ray screen having contrasting colors and unlike rates of decay of luminescence |
US2455710A (en) * | 1943-12-21 | 1948-12-07 | Rauland Corp | Color television system |
US2472988A (en) * | 1944-10-28 | 1949-06-14 | Scophony Corp Of America | Apparatus for reproducing electric signals, particularly television reproducers |
US2461515A (en) * | 1945-07-16 | 1949-02-15 | Arthur B Bronwell | Color television system |
US2547775A (en) * | 1946-01-23 | 1951-04-03 | Rca Corp | Fluorescent color screen for electron optical systems |
US2446248A (en) * | 1946-06-13 | 1948-08-03 | Rca Corp | Phosphor screen |
US2543477A (en) * | 1948-07-29 | 1951-02-27 | Rca Corp | Kinescope for the reproduction of color images |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2687360A (en) * | 1951-01-18 | 1954-08-24 | Rauland Corp | Process for making a multicolor fluorescent screen |
US2730644A (en) * | 1951-04-10 | 1956-01-10 | Hyman A Michlin | Electroluminescent light means |
US2728011A (en) * | 1952-05-01 | 1955-12-20 | Rca Corp | Color television picture and pick-up tubes |
US2958002A (en) * | 1952-11-13 | 1960-10-25 | Gen Electric | Production of colored images |
US2785331A (en) * | 1953-08-24 | 1957-03-12 | Rca Corp | Art of making color-phosphor screens |
US2810013A (en) * | 1953-10-05 | 1957-10-15 | Harry R Lubcke | Color television reproducing systems |
DE1012954B (de) * | 1955-02-25 | 1957-08-01 | Reich Robert W | Elektronenstrahlroehre zur Wiedergabe farbiger Fernsehbilder |
US2827593A (en) * | 1955-04-29 | 1958-03-18 | Gen Electric | High purity color information screen |
US2892116A (en) * | 1956-05-14 | 1959-06-23 | Willer Leila Lea Frank | Color television receiver and picture tube |
US2967262A (en) * | 1956-07-30 | 1961-01-03 | Madey Richard | Multi-color display tube |
US2992919A (en) * | 1956-12-13 | 1961-07-18 | Gen Electric | Method of making cathode ray tube screens |
US3046154A (en) * | 1957-04-19 | 1962-07-24 | Davohn Corp | Method for forming luminescent screens |
US3099820A (en) * | 1959-03-31 | 1963-07-30 | Bell Telephone Labor Inc | Optical storage system |
DE1172298B (de) * | 1961-05-08 | 1964-06-18 | Rca Corp | Leuchtschirm fuer Farbfernsehbildroehre |
US3204143A (en) * | 1961-05-08 | 1965-08-31 | Rca Corp | Penetration color screen, color tube, and color television receiver |
DE1225229B (de) * | 1961-05-08 | 1966-09-22 | Rca Corp | Lumineszenzschirm fuer eine Kathodenstrahlroehre zur Wiedergabe bunter Bilder und Verfahren zu seiner Herstellung |
US3514287A (en) * | 1961-10-09 | 1970-05-26 | Rca Corp | Photographic method for making tri-colored cathode ray screen |
US3231775A (en) * | 1961-12-27 | 1966-01-25 | Rca Corp | Cascaded phosphor layers for color display including one of discrete coherent particles |
US3290434A (en) * | 1963-07-24 | 1966-12-06 | Polaroid Corp | Color television receiver including display means comprising two uniformly distributed luminescent materials |
US3517243A (en) * | 1969-03-17 | 1970-06-23 | Texas Instruments Inc | Color display screen employing two layers of phosphors,particles in the inner layer being small with respect to those in the outer layer and discontinuous in coverage |
US3664862A (en) * | 1969-07-22 | 1972-05-23 | Gen Electric | Electron energy sensitive phosphors for multi-color cathode ray tubes |
US3721849A (en) * | 1971-01-07 | 1973-03-20 | Gte Sylvania Inc | Dual persistence screen for a cathode ray tube |
US4204136A (en) * | 1978-03-17 | 1980-05-20 | Westinghouse Electric Corp. | Dual layer phosphor screen for cathode ray tube |
US4906892A (en) * | 1987-11-13 | 1990-03-06 | Thomson-Csf | High luminance color screen for cathode ray tube and method for making a screen of this type |
Also Published As
Publication number | Publication date |
---|---|
BE506607A (pt) | |
GB701853A (en) | 1954-01-06 |
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