US3569761A - Color phosphor electroluminescent screen with filters for color cathode-ray display tubes - Google Patents

Color phosphor electroluminescent screen with filters for color cathode-ray display tubes Download PDF

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US3569761A
US3569761A US830288A US3569761DA US3569761A US 3569761 A US3569761 A US 3569761A US 830288 A US830288 A US 830288A US 3569761D A US3569761D A US 3569761DA US 3569761 A US3569761 A US 3569761A
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screen
phosphor
image
filter
color
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US830288A
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Howard G Lange
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Zenith Electronics LLC
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Zenith Radio Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
    • H01J29/327—Black matrix materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2278—Application of light absorbing material, e.g. between the luminescent areas

Definitions

  • the screen of a three gun shadow mask type of color cathode-ray tube is formed of three interleaved sets of filters, with the filters of each set predominantly transmissive of an assigned one of the primary colors green, blue and red.
  • the filters are circular and are of such diameter that their outer peripheral portions overlap, leaving a central section of eachfilter free to accept a phosphor that emits light of a wavelength for which the associated filter is predominantly transmissive.
  • the screen in effect, has a multiplicity of elemental picture areas grouped to form color triads and individually surrounded by a filter that attenuates substantially all visible light.
  • Screening is accomplished with photosensitive coatings that are selectively exposed by actinic energy projected through the shadow mask. Each such exposure develops an image of one set of filters which is then developed. This process is conducted for each of the three colors to form three sets of filters with overlapping peripheral portions. Thereafter or essentially at the same time, the phosphor materials are deposited with the emission of each phosphor material properly correlated colorimetrically with the filter over which it is superposed.
  • the present invention is directed to the screen of, and the method of screening, a color image reproducing device such as a color cathode-ray tube.
  • the method concept is of general application, it is especially advantageous in the fabrication of color tubes that require the elemental phosphor deposits to be smaller in size than the transparent portions of the color-selection electrode characteristically included in such a tube. More specifically, where the tube is of the three-color shadow mask variety, having phosphor deposits in the form of dots arranged to constitute a multiplicity ofdot triads, it is necessary that the phosphor dots be. smaller than the apertures of the shadowmask if the tube employs either post-deflection focus or black surround. Each of these features is attractive.
  • Post-deflection focusing has the advantage of focusing the electron beams to the end that more electrons impinge upon the elemental phosphor areas of the screen than otherwise and thus enhanced brightness is obtained.
  • Black surround is an expression used to define a color tube in which the elemental phosphor deposits are surrounded by a pigment or light-absorbing material, such as maganese dioxide.
  • the use of a circumscribing light-absorbing material improves the contrast of the picture tube and has the further benefit of reducing the need of, if not making totally unnecessary, the darkened or filter-type implosion plate that is generally employed in commercial color television receivers. This attribute of black surround substantially increases the brightness of the tube as more fully described in the aforeidentified Fiore et al. patent.
  • the conventional methods of screening sucha tube entail applying to the image area a coating of a photosensitive material which is selectively exposed to actinic energy or radiation directed through the shadow mask.
  • An obvious advantage derives from exposing through the shadow mask that is ultimately to be installed as a component of the tube in process in that this establishes the proper positions of the phosphor deposits on the screen in relation to the apertures of the mask.
  • the elemental areas of the screen exposed through the shadow mask will have the same configuration and at least approximately the same size as the holes of the mask through which the exposing radiation passes.
  • the apertures of the mask be temporarily closed down by a filler or cladding of amaterial that may be readily removed after the mask with. its holes of temporarily reduced size has been used in screening.
  • a filler or cladding of amaterial that may be readily removed after the mask with.
  • its holes of temporarily reduced size has been used in screening.
  • copper or other metals as a filler to be removed by selective etching after the screening has been accomplished.
  • a temporary filler leads to problems of uniformity in dot size and configuration.
  • the shadow mask is originally formed with holes properly sized to be used in screening so that the phosphor deposits are of the proper diameter or dimension.
  • the mask is reetched after the screening has been accomplished in order to open up or enlarge the holes to a desired size relative to. the phosphor dots that have been deposited on the image area of the screen.
  • a process of this type that has been used successfully in production is the sub ject of application Ser'. No. 81 1,318, filed Mar. 28, 1969 in the name of Sam l-l. Kaplan and assigned to the assignee of the present invention.
  • a screen for a color image reproducing device comprises a substrate that is substantially transmissive of all light wavelengths in the visible spectrum.
  • a plurality of sets of image elements are disposed in an interleaved pattern over the substrate with the elements of each such. set excitable to emit light of an assigned one of a corresponding plurality of primary colors.
  • An attenuator for visible light wavelengths is disposed only on the portions of the substrate that surround the image elements of each of the sets and this attenuator comprises overlapping filters which individually have a relatively high transmission efficiency for light of only an assigned one of the primary colors and a relatively low transmission efficiency for light in the remainder of the visible spectrum.
  • the method of the invention for forming such a screen comprises applying to the image area a plurality of sets of filters that individually have a relatively high transmission efficiency but for light of only an-assigned one of the plurality of primary colors involved.
  • Thefilters are applied with such dimensions and such arrangement as to have overlapping peripheral portions which form over the screen a composite filter for attenuating substantially all wavelengths in the visible spectrum and patterned to surround a multiplicity of spaced elemental portions of the image area which indiviually have a high transmission efficiency for light of an assigned primary color.
  • a phosphor is applied to each of those elemental portions of the image area which, when excited by electron bombardment, for example, emits light which, preferably, predominates at the wavelength assigned to the particular elemental area of the screen to which that phosphor has been applied.
  • the iii-- dividual filters' are circular. They cover the multiplicity of elemental image areas which. contribute to image reproduction and individually extend beyond the assigned elemental image area to overlap with others of the filters in the portions of the screen that surround the elemental image areas, imparting to such portions of the screen the property of attenuating light in the visible spectrum.
  • the filter components are formed by exposing a photosensitive layer through the apertures of 5 DESCRIPTION OF THE DRAWINGS.
  • FIG. I is a fragmentary plan view of a portion of the image screen of a color image reproducing device constructed in accordance with the invention.
  • FIG. 2 is a view taken on section line 2-2 of FIG. 1.
  • the invention is useful whether the screen is made of phosphor elements that are generally circular or in the form of stripes but, for convenience, the now familiar dot triad type of screen will be described. It is also to be noted that the configuration of the tube is of no particular consequence. The invention is equally useful for tubes having round as well as rectangular image areas. In either case, the envelope has two principal sections that are initially separated from one another which is a convenience in screening. One of these sections is referred to as the cap or faceplate section which is constituted of the screen or image area and a cicumscribing flange.
  • the other section is conical and is configured as well as dimensioned at its large end to match the flange of the faceplate so that they may ultimately be united through a frit sealing or other suitable integrating process.
  • the smaller end of the conical section terminates in a neck which houses an assembly or cluster of three electron guns, certain of the electrodes of which are conductively connected to terminal prongs of a base applied to the end of the neck.
  • the tube structure, aside from its screen and the method of making that screen, may all be conventional and will not be considered further herein.
  • FIGS. 1 and 2 shows a fragment of a substrate that is substantially transmissive of all light wavelengths in the visible spectrum.
  • the substrate is the image area or faceplate of the picture tube and may be 100 percent transmissive to visible light, or it may have some filtering attributes further to enhance contrast by having a transmissivity for visible light of perhaps 90 percent or less. From the standpoint of material, it is a known composition of glass conventionally used in forming the envelope of a color cathode-ray tube; there is nothing unique required of the material of the faceplate.
  • these elemental phosphor deposits G, B and R may be said, at least to a first approximation, to have a configuration that is generally the same as the apertures of the mask. Since their location on the screen and specific shape result from an exposure of the image area with actinic radiation or energy directed through the apertures of the mask, each set of image elements, be it the deposits of green, blue or red phosphor, is distributed over the image area in the same pattern as the pattern of apertures in the shadow mask.
  • the relative positions of the image elements of the three sets are determined by the position of the source of actinic energy in each of three exposure steps in essentially the same manner as conventional photoresist slurry screening processes for depositing phosphor dots on a mosaic screen of the type under consideration. For this reason, while the three sets of image-elements are arranged in accordance with the same pattern, the patterns are interleaved with one another over the substrate and collectively define the desired multiplicity of dot triads.
  • One such triad for example, is identified by reference to character 11g, llr and 11b in FIG. 1.
  • each such element has a principal dimension that is smaller than the corresponding dimension of the electron transparent areas or holes of the color-selection electrode.
  • the maximum dimensions of image element 11g is smaller than the hole diameter 12a of the mask 12, a fragmentary portion of which is shown in FIG. 2.
  • the representation of the mask has been omitted from that view.
  • the tube has three electron guns each of which directs an electron beam to screen 10 through the holes of the mask and the angular relation of the beams to the mask is such that one beam impacts only upon green image elements G, another impacts only upon blue image elements B, while the third impinges solely on red image elements R.
  • each of the filter components is disposed over its associated image element and extends over the portion of the substrate separating that image element from its neighbors to constitute in this fashion one component of the overlapping filters of the light attenuator.
  • the filter component of the green image element 11g is designated 13g. it is applied directly over'substrate and the green phosphor G is, in turn, coated over its associated filter component 13g.
  • the diameter of the filter component 13g is Clearly, the diameter of the filter component 13g exceeds the maximum dimension of the phosphor deposit G and the filter component therefore extends beyond the area of the image element G.
  • FIG. 1 the filter component of the green image element 11g
  • a blue filter component 13b which is assumed to have been applied to substrate 10 after the application of the green filter component 13 g.
  • portion 13b of the blue filter component overlaps the corresponding peripheral portion of the green filter component 13g.
  • the red filter component l3r has, a peripheral portion l3r that extends over the contiguous portion of the green filter component 13g. Assuming the red filter to have been the last of the three to be applied, it will have another peripheral portion l3r" which overlaps a portion 13b" of the blue filter component.
  • These overlapping peripheral portions of the filter components are represented by the crosshatching in FIG. 1. if the filter components are properly related colorimetrically, any portion of screen lO where two or more of such filters overlap is essentially black, that is to say, has an exceedingly low transmission efficiency in the neighborhood of 10 to percent or less for all wavelengths in the visible spectrum.
  • each image element is constituted of a phosphor deposit that is surrounded with a light-absorbing pigment, whereas in the described arrangement light attenuation in the regions between image elements is achieved by a visible-light attenuator surrounding each image element and comprised of overlapping filters which individually have a relatively high transmission efficiency for light of a particular assigned primary color but a low transmission efficiency for light in the remainder of the visible specmm.
  • the materials suitable for the various filter components may be those described in Kaplan U.S. Pat. No. 3,l 14,065 and they may be applied through a process similar to that claimed in its parent, namely U.S. Pat. No. 2,957,483. More specifically, vitreous color filter materials having a relatively low fusing temperature of the order of 430 C., which are commercially available, are suitable for use as the filter components. lllustrative designations of appropriate commercially available materials are Coming Glass No. 7570, marketed by Corning Glass Works, and Corning Glass No. 8363. The latter is especially suitable because it has a thermal coefficient of expansion which matches that of the glass normally employed in color cathode-ray tube envelopes.
  • a similar type of glass is available from Kimball Glass Company under the designation No. 50 solder glass which also has an acceptable fusion temperature.
  • these glasses are lead borate types to which inorganic colorants are added to provide the necessary color filter characteristics.
  • cobalt oxide may be used as a color for the blue filter components, copper oxide or chromium oxide for green and cadmium sulfide for red.
  • Vitreous materials of this type are advantageous because they are known to be compatible with high vacuum cathode-ray tubes. Additionally, they may be applied to the surface of substrate 10 by photoprinting and electrostatic techniques quite similar to those employed in depositing phosphor color materials. Their low fusing temperatures make possible affixing the filter components to substrate 10 in the course of normal tube processing without the need for special processing temperatures which might introduce the possibility of damage to the phosphor deposits. I
  • a convenient slurry comprises an organic photosensitive material that is normally soluble in water, such as polyvinyl alcohol sensitized with ammonium dichromate. if such a slurry includes a green filter of powdered fusible material, it may be applied in the usual manner as a coating over the entire sub-' strate 10. This provides a surface condition to the substrate that may be altered by exposure to actinic energy, such as ultraviolet light.
  • the shadow mask 12 is installed in its proper position relative to screen ll) and the ultraviolet source is positioned to simulate the electron gun of the tube that is intended to excite the green target elements or phosphor deposits.
  • the energy source then directs ultraviolet light through apertures 12a of the shadow mask 12 to selectively expose the coating of substrate 10 and thereby create a latent image of the set of green filter components.
  • This exposure takes place in an exposure chamber or lighthouse and the exposed portions of the polyvinyl alcohol coating are a set of circular and spaced separated areas of the screen having the same pattern arrangement as the holes of the mask. It is known that the diameter of each exposed area is subject to control by the intensity of the light and the duration of the exposure interval.- These parameters are adjusted to the end that the latent image of the green filter components has the size shown in FIG. 1 by the broken construction line.
  • This image is then developed by washing substrate 10 with water to complete forming the set of green filter components 13g on substrate 10.
  • the individual green filter components have, in effect, the configuration of a projection of the aligned hole of the shadow mask and are round since the mask has been assumed to have circular apertures 12a.
  • a similar sequence of steps is carried out for each of the other sets of color filter components.
  • the only changes required in forming the blue filter components 13b are the use of a photosensitive resist which has a blue filter material in powdered form rather than green and the positioning of the exposure light sourcewhich must be modified to simulate the electron gun intended to energize the blue image elements.
  • the photoresist slurry has a red filter ingredient and the light source is positioned to simulate the electron gun assigned to excite the red image elements.
  • the screen at this stage in the processing has the three interleaved patterns of green, blue and red color filter components with their outer peripheral portions in overlapping relation to define a visible-light attenuator surrounding elemental image areas of substrate ill and each such area is covered by a single color filter that transmits essentially only the color or wavelength of light that has b'eEnassigned to it. It is now only necessary to apply the deposits of the green, blue and red.
  • the screen may be filmed and alumized in the usual fashion and the filter components will be affixed to substrate 10 by fusion either in a separate heat treatment step or during bakeout.
  • the screen structure of FIG. I may also be processed through the techniques of electrostatic screening described and claim in US. Pat. No. 3,475,169 of Howard G. Lange. In
  • substrate 10 is first provided with coating of conductive material over which is superposed a coating of a photoconductor, both preferably being organic so as to be eliminated in bakeout.
  • the screen is then subjected to a corona discharge in order to establish a uniform charge over the entire photoconductor.
  • the screen is exposed to ultraviolet light through the shadow mask to establish a latent charge image of the green filter components and that image is developed by applying to the image area a polarized toner which contains fusible green filter material in powdered form.
  • the polarity of the toner is determined by whether direct or reverse imaging is desired.
  • the toner is provided with the same polarity as the polarity of the charge on the photoconductor. This is referred to as reverse imaging. Direct imaging occurs where the polarity of the toner is opposite that of the charge on the photoconductor in which case the toner is attracted to the portions of the photoconductor that retain a charge after exposure.
  • the Lange application sets forth formulations of the conductive and photoconductive layers required for the substrate and characterized by the fact that they are organic and are easily removed during bakeout.
  • the filter and phosphor components it is believed possible, for example, to apply the filter and phosphor components to one set of elemental image areas concurrently. Assume that the photoconductor has been selectively'exposed to create a latent charge image of the set of green filter components. If the toner used to develop the latent image includes both the powdered form of filter material and powdered phosphor material in suspension, they will settle out together and be deposited concurrently in the discharged areas of the screen. Desirable stratification ,may still be obtained if the filter and phosphor materials have appropriate relative densities. For example, if the filter is made of a heavy material such as lead glass, it will settle out first and the phosphor will then be superposed on the filter as preferred.
  • the toner convey both the filter and phosphor materials simultaneously.
  • a toner carrying filter material may be applied and the excess poured out after the filter material has been deposited. Sufficient residual charge will remain on the photoconductor to now permit the introduction of a second toner carrying phosphor material which will then deposit over the filter, establishing the desired stratification.
  • This has the advantage of applying both the filter and phosphor materials of one set of image elements without the necessity of recharging the photoconductor. In this case, however, the filter and phosphor components of one set of image elements is completely deposited after which the image elements of the remaining sets are similarly created.
  • a toner with a filter maybe poured over the image area to develop the latent image of one set of the, filter components and, after the filter material has been deposited, phosphor material of the appropriate color may be applied, as by spraying, over the toner to settle therethrough and deposit on top of its associated filter component.
  • each of the sets of filter components be a continuous coating over the associated image elements of the substrate but that is not a necessary limitation on the structure. If the filter component isdiscontinuous, perhaps, having a crystalline form, acceptable results are nevertheless obtained if there is sufficient overlap of the crystals of the various filter components to provide the desired visible-light attenuator in the portions of the substrate that surround the multiplicity of elemental image areas.
  • a particularly attractive feature of the present invention is the elimination of any need to change the size of the mask apertures either as an accommodation for screening or after screening has been completed.
  • the screen is formed with its apertures of the desired final size for use as the color-selection electrode of the tube in process. This is a great advantage with respect to uniformity, processing complications and cost.
  • the filter components of the visible-light attenuator or black surround may be formed concurrently with the phosphor deposits and thus simplify the fabrication of the screen.
  • a screen for a color image reproducing device comprising a substrate that is substantially transmissive of all light wavelengths in the visible spectrum
  • an attenuator for visible light wavelengths disposed only on the portions of said substrate that surround the image elements of each of said sets and comprising at least a pair of overlapping filters which individually have a relatively high transmission efficiency for light of only an assigned one of said primary colors and a relatively low transmission efficiency for light in the remainder of the visible spectrum.
  • said filter component of each image element is deposited on said substrate and said phosphor component is deposited over its associated filter component;
  • said filter component of each image element extends over the portions of said substrate that surround its image element to constitute a component of the overlapping filters of said attenuator.
  • a screen in accordance with claim 3 in which the phosphor component of each image element, when excited, emits predominantly light for which its associated filter component has relatively high transmission efficiency.
  • a screen for a color image reproducing device that has a color-selection electrode with a pattern of electron transparent areas which comprises:
  • a substrate that is substantially transmissive of all light wavelengths in the visible spectrum a plurality of sets of image elements disposed in similar patterns and interleaved with one another over said substrate, said image elements individually having a configuration corresponding to that of, but a principal dimension that is smaller than the corresponding dimension of, the individual transparent areas of said color-selection electrode and comprising a phosphor component for emitting light of an assigned one of a plurality of primary colors and also a filter component that has a relatively high transmission efficiency for light emitted by the associated phosphor component and a relatively low transmission efficiency for light in the remainder of the visible spectrum; and
  • an attenuator for visible light wavelengths disposed only on the intervening portions of said substrate that surround said image elements and comprising extensions of said filter components of said image elements which project into the immediately contiguous part of said intervening portions of said substrate in .overlapping relation with respect to similar extensions of the filter components of the adjacent ones of said image elements.
  • said color-selection electrode is a shadow mask having a pattern of holes through which electrons may pass;
  • said sets of image elements are substantially in alignment with the holes of said mask so that electrons passing through said holes may selectively impact an image element of any of said sets of image elements.
  • said holes of said mask are substantially circular
  • each image element is a deposit having a maximum dimension less than the diameter of said mask holes
  • said filter component is interposed between said substrate and said phosphor component and is substantially circular with a diameter approximately equal to the distance from the center of one image element to the outer periphery of an adjacent image element.
  • said screen has three sets of image elements each of which is assigned to emit light of one of the primary colors, green, blue and red;
  • each image element in response to electron excitation, emits light of essentially only its assigned one of said primary colors; and -in which the filter component of each image element is predominantly transmissive of the visible light emitted by its associated phosphor component.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Luminescent Compositions (AREA)
US830288A 1969-06-04 1969-06-04 Color phosphor electroluminescent screen with filters for color cathode-ray display tubes Expired - Lifetime US3569761A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748515A (en) * 1972-04-03 1973-07-24 Zenith Radio Corp Color television picture tube with subtractive color filters
US3763389A (en) * 1970-05-11 1973-10-02 P Schwarz Shadow mask having concave reflecting surface surrounding each aperture
JPS49130669A (https=) * 1973-04-16 1974-12-14
US3884694A (en) * 1973-11-02 1975-05-20 Gte Sylvania Inc Process for forming a color cathode ray tube screen structure having optical filter elements therein
US3884695A (en) * 1973-11-02 1975-05-20 Gte Sylvania Inc Process for fabricating a color cathode ray tube screen structure having superimposed optical filter means therein
US3891440A (en) * 1973-11-02 1975-06-24 Gte Sylvania Inc Process for fabricating a color cathode ray tube screen structure incorporating optical filter means therein
US3952225A (en) * 1970-02-24 1976-04-20 Zenith Radio Corporation Cathode-ray tube having phosphor screen interposed between composite mesh and reflective layer
US3986073A (en) * 1971-08-18 1976-10-12 U.S. Philips Corporation Luminescent screen of a color television tube
US4020191A (en) * 1974-09-13 1977-04-26 Hitachi, Ltd. Method for forming flat display panel phosphor dots
US4021820A (en) * 1973-08-20 1977-05-03 Rca Corporation Lighthouse having a main filter and a supplemental filter
US4100452A (en) * 1976-11-02 1978-07-11 Zenith Radio Corporation Color television picture tube image screen having positive and negative misregistration tolerance conditions
US4117177A (en) * 1976-09-13 1978-09-26 Gte Laboratories Incorporated Laser lithography of thin film resinates
US4135113A (en) * 1976-03-08 1979-01-16 Tokyo Shibaura Electric Co., Ltd. Line-type picture tube with light-absorbing particles mixed with blue phosphor
US4217520A (en) * 1978-08-30 1980-08-12 Zenith Radio Corporation Image display faceplate having a chromatic matrix
EP0003612B1 (de) * 1978-02-15 1983-03-09 Siemens Aktiengesellschaft Verfahren zum Herstellen von gefärbten, insbesondere schwarz gefärbten Bildpunktumrandungen vorbestimmter Leitfähigkeit für vorzugsweise flache Farb-Bildschirme
US5239228A (en) * 1990-07-02 1993-08-24 Sharp Kabushiki Kaisha Thin-film electroluminescence device for displaying multiple colors with groove for capturing adhesive
US5914558A (en) * 1992-03-25 1999-06-22 Sony Corporation Cathode ray tube with color filters aligned with phosphors
US20080231162A1 (en) * 2007-01-31 2008-09-25 Makoto Kurihara Lighting device and display device provided with the same
KR20160017447A (ko) * 2014-08-06 2016-02-16 엘지이노텍 주식회사 발광 유닛

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GB2178226A (en) * 1985-06-12 1987-02-04 Gec Avionics Limted Cathode ray tubes
JPH01192072A (ja) * 1988-01-27 1989-08-02 Nec Home Electron Ltd 電子装置内のフロッピーディスク駆動ユニット制御回路検査装置
GB2240213A (en) * 1990-01-23 1991-07-24 British Broadcasting Corp Colour display device

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952225A (en) * 1970-02-24 1976-04-20 Zenith Radio Corporation Cathode-ray tube having phosphor screen interposed between composite mesh and reflective layer
US3763389A (en) * 1970-05-11 1973-10-02 P Schwarz Shadow mask having concave reflecting surface surrounding each aperture
US3986073A (en) * 1971-08-18 1976-10-12 U.S. Philips Corporation Luminescent screen of a color television tube
US3748515A (en) * 1972-04-03 1973-07-24 Zenith Radio Corp Color television picture tube with subtractive color filters
JPS49130669A (https=) * 1973-04-16 1974-12-14
US4021820A (en) * 1973-08-20 1977-05-03 Rca Corporation Lighthouse having a main filter and a supplemental filter
US3884694A (en) * 1973-11-02 1975-05-20 Gte Sylvania Inc Process for forming a color cathode ray tube screen structure having optical filter elements therein
US3884695A (en) * 1973-11-02 1975-05-20 Gte Sylvania Inc Process for fabricating a color cathode ray tube screen structure having superimposed optical filter means therein
US3891440A (en) * 1973-11-02 1975-06-24 Gte Sylvania Inc Process for fabricating a color cathode ray tube screen structure incorporating optical filter means therein
US4020191A (en) * 1974-09-13 1977-04-26 Hitachi, Ltd. Method for forming flat display panel phosphor dots
US4135113A (en) * 1976-03-08 1979-01-16 Tokyo Shibaura Electric Co., Ltd. Line-type picture tube with light-absorbing particles mixed with blue phosphor
US4117177A (en) * 1976-09-13 1978-09-26 Gte Laboratories Incorporated Laser lithography of thin film resinates
US4100452A (en) * 1976-11-02 1978-07-11 Zenith Radio Corporation Color television picture tube image screen having positive and negative misregistration tolerance conditions
EP0003612B1 (de) * 1978-02-15 1983-03-09 Siemens Aktiengesellschaft Verfahren zum Herstellen von gefärbten, insbesondere schwarz gefärbten Bildpunktumrandungen vorbestimmter Leitfähigkeit für vorzugsweise flache Farb-Bildschirme
US4217520A (en) * 1978-08-30 1980-08-12 Zenith Radio Corporation Image display faceplate having a chromatic matrix
US5239228A (en) * 1990-07-02 1993-08-24 Sharp Kabushiki Kaisha Thin-film electroluminescence device for displaying multiple colors with groove for capturing adhesive
US5914558A (en) * 1992-03-25 1999-06-22 Sony Corporation Cathode ray tube with color filters aligned with phosphors
US6071657A (en) * 1992-03-25 2000-06-06 Sony Corporation Cathode ray tube and the method of the phosphor layer
US20080231162A1 (en) * 2007-01-31 2008-09-25 Makoto Kurihara Lighting device and display device provided with the same
US7821188B2 (en) * 2007-01-31 2010-10-26 Seiko Instruments Inc. Lighting device and display device provided with the same
KR20160017447A (ko) * 2014-08-06 2016-02-16 엘지이노텍 주식회사 발광 유닛

Also Published As

Publication number Publication date
DE2027533B2 (de) 1972-11-02
ES380965A1 (es) 1972-10-16
GB1250308A (https=) 1971-10-20
NL7008122A (https=) 1970-12-08
JPS4816023B1 (https=) 1973-05-18
DE2027533A1 (de) 1970-12-10

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