EP0445298A1 - Farbkathodenröhre - Google Patents

Farbkathodenröhre Download PDF

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Publication number
EP0445298A1
EP0445298A1 EP19900913735 EP90913735A EP0445298A1 EP 0445298 A1 EP0445298 A1 EP 0445298A1 EP 19900913735 EP19900913735 EP 19900913735 EP 90913735 A EP90913735 A EP 90913735A EP 0445298 A1 EP0445298 A1 EP 0445298A1
Authority
EP
European Patent Office
Prior art keywords
phosphor
layers
laminate
layer
ray tube
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.)
Withdrawn
Application number
EP19900913735
Other languages
English (en)
French (fr)
Other versions
EP0445298A4 (en
Inventor
Norihisa c/o Products Development Labs. OSAKA
Yukihiro c/o Products Development Labs. IKEGAMI
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.)
Mitsubishi Rayon Co Ltd
Miyota KK
Miyota Co Ltd
Original Assignee
Mitsubishi Rayon Co Ltd
Miyota KK
Miyota Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP11148289U external-priority patent/JPH0350744U/ja
Priority claimed from JP26938889A external-priority patent/JPH03133031A/ja
Application filed by Mitsubishi Rayon Co Ltd, Miyota KK, Miyota Co Ltd filed Critical Mitsubishi Rayon Co Ltd
Publication of EP0445298A1 publication Critical patent/EP0445298A1/de
Publication of EP0445298A4 publication Critical patent/EP0445298A4/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01J29/325—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 with adjacent lines

Definitions

  • the present invention relates to a color cathode-ray tube and, in particular, to a color cathode-ray tube suitable for providing the higher fineness of the pattern that has recently come to be demanded of color cathode-ray tubes.
  • the electron guns that are widely used in color cathode-ray tubes have a form in which three electron guns are arranged in a straight line, to realize a method called an in-line method.
  • a stripe pattern that allows more efficient use of brightness than a dot pattern and enables the electron beams to correctly excite each of luminous color phosphor elements is mainly used for the phosphor layer on the front screen panel of the cathode-ray tube.
  • This stripe pattern is constructed of a repeating sequence of red phosphor layers, green phosphor layers, and blue phosphor layers, with layers of a non-luminous substance, such as carbon, between adjacent layers of differently colored phosphor.
  • the stripe pattern is formed by either a slurry method, dusting method or an optical adhesion method using exposure technology, or a screen printing method using printing technology.
  • the most common methods use slurries.
  • a liquid called a slurry formed by dispersing a phosphor in a mixture of polyvinyl alcohol and bichromate is coated onto the panel by spin-coater, then the required portions of the slurry are optically cured by exposure to ultraviolet light through an exposure mask such as a shadow mask, to fix the phosphor. Uncured portions of the slurry are washed away with hot distilled water, leaving the pattern of the phosphor layer. This process is repeated with the other phosphors and carbon to form the stripe-pattern phosphor layer.
  • the panel on which this phosphor layer is provided is then combined with a funnel and electron gun to form the color cathode-ray tube.
  • ultraviolet light is reflected back unevenly by the phosphor when a thick layer such as a phosphor-containing slurry coated onto the panel surface is exposed, and the cross-sectional area of the ultraviolet light emitted from an entrance side toward the thick film widens as the light approaches the film, making it difficult to adjust the stripe width and also undesirably deteriorating the linearity of the stripes.
  • Screen printing methods using printing technology mainly use stainless-steel screens, but the minimum width of the slits that form the stripe pattern of these stainless-steel screens is 0.1 mm, so these methods cannot be used to make a smaller cathode-ray tube or a finer pattern.
  • the present invention is based on the above background and its object is to provide a color cathode-ray tube provided with a phosphor layer having the extremely fine pattern necessary for high resolution.
  • a color cathode-ray tube comprises at least a front screen panel, a funnel, and an electron gun; a phosphor layer is provided on the panel, the phosphor layer being comprised of a multilayered material of a repeated sequence of red phosphor layers, green phosphor layers, blue phosphor layers, and non-luminous layers, and the laminate is sliced in the thickness direction thereof to form a thin layer and is burned; wherein the laminate has a construction such that non-luminous layers are interposed between adjacent phosphor layers.
  • each of the layers in the multilayered sheet is a red, green, or blue phosphor layer or a carbon layer that is a composite of red, green, or blue phosphor or carbon, respectively, uniformly dispersed in a burnable organic binder, and the laminate is composed of a repeating sequence of these layers stacked to a specific thickness, with carbon layers interposed between adjacent phosphor layers.
  • each of the layers in the multilayered sheet is a composite of red, green, or blue phosphor uniformly dispersed in a burnable organic binder, the composite being coated onto and dried on a film to obtain red, green, or blue phosphor-coated film, and the phosphor-coated films are stacked in a repeating sequence to a specific thickness.
  • a black stripe layer is arranged between the burned slice of the laminate and the front screen panel, the black stripe layer being positioned to correspond to the non-luminous layers.
  • the phosphor layer of the present invention is obtained from a slice through a laminate, no exposure step such as that employed in a conventional photo-curing method is used, so there is no need to provide equipment such as an exposure device.
  • a cathode-ray tube with a phosphor screen of an extremely fine stripe pattern can be obtained at a low manufacturing cost.
  • the widths of the phosphor stripes and non-luminous stripes can be easily controlled to lie within a range from a fine width of about 10 ⁇ m to a comparatively thick width.
  • the present invention can be used to efficiently construct a color phosphor panel having an extremely high precision and a high resolution, and can also form very fine RGB stripes, it can be applied to the construction of compact CRTs that is difficult with conventional techniques, and it thus has great industrial significance.
  • Figure 1 is a partially cutaway perspective view of an embodiment of the color cathode-ray tube of the present invention
  • Figure 2 is a detail of the state of a phosphor layer coated onto a film of an embodiment of the present invention
  • Figure 3 (A) is a detail of the state of alternately stacked phosphor layers and carbon layers according to one embodiment of the present invention
  • Figure 3 (B) is a detail of the state of repeatedly stacked phosphor-coated films according to one embodiment of the present invention
  • Figure 4 is a perspective view of a state in which a slice is being cut from a laminate
  • Figure 5 is a plane view of a state in which a slice is provided on a panel
  • Figure 6 is a plane view showing a color phosphor layer obtained by burning a panel
  • Figure 7 is a plane view of a state in which black stripes are formed on a panel
  • Figure 8 is a cross-section through a slice pasted onto a panel on which black stripes are formed.
  • the color cathode-ray tube of the present invention comprises at least a front screen panel, a funnel, and an electron gun.
  • a phosphor layer that is used as a structural component thereof is formed as a thin slice through a laminate built up of alternate phosphor layers and non-luminous layers that is burned and arranged on the panel.
  • FIG. 1 A partially cutaway perspective view of one embodiment of the color cathode-ray tube of the present invention is shown in Figure 1.
  • This embodiment comprises a front screen panel 5, a funnel 8, an electron gun 9, and a striped phosphor layer B applied to the surface of the front screen panel 5 on the electron gun 9 side.
  • the phosphor layer B is covered by a metal back layer 6 formed by aluminum vapor deposition, and an index phosphor layer 7 is formed on this metal back layer 6.
  • the striped phosphor layer B of this embodiment comprises a repeating pattern of red phosphor layers 2, green phosphor layers 3, and blue phosphor layers 4, with non-luminous layers therebetween.
  • the funnel 8 and the panel 5 are connected together by a frit seal 10, and an index signal read-out window 11 is provided in the cone part of the funnel.
  • the following gives a detailed description of the phosphor layer of the present invention, in other words, a description of how a laminate is formed and then the laminate is sliced and burned to form a burned slice.
  • the method is such that red, green, and blue phosphor layers and carbon layers, each respectively formed of a composite of a red, green, or blue phosphor or carbon dispersed uniformly in a burnable organic binder, are stacked in a repeating pattern with carbon layers interposed between adjacent colored phosphor layers, to form a laminate of a specific thickness.
  • the organic solvent diluent of the organic binder in which the phosphor is dispersed can be applied by a coating method using a roller-coater or by a screen-printing method, the organic solvent can be removed by drying, and the above process can be repeated on top of the dried layer.
  • the phosphors used in the manufacture of the phosphor layer can be commercially available products, but, in order to obtain an extremely fine stripe pattern, phosphors of a fine particle size are preferable. Specific examples of these phosphors include Y2O2S:Eu for red, (ZnCd)S:Cu, Al for green, and ZnS:Ag for blue, all of a particle size of about 3 to 10 ⁇ m.
  • the organic binder in which the phosphors are dispersed is not specifically limited, so long as it is a resin with excellent burning properties, the phosphors and carbon can be uniformly dispersed therein, and it can layers of a uniform thickness can be formed. Calcination residues are not preferable because they can cause the generation of black spots during the manufacture of the CRT, and can greatly shorten the life of the CRT.
  • organic binder examples include cellulose resins, vinyl alcohols, and (meth)-acrylic resins, but (meth)-acrylic resins are preferable from the calcination property point of view.
  • the carbon can be a commercially available product, but, in order to obtain an extremely fine stripe pattern, carbon of a fine particle size is preferable.
  • a specific example of the carbon is highly pure graphite, used in a particle size of about 3 to 10 ⁇ m.
  • An actual example of the method of the first mode of the manufacture of the laminate is to screen-print each layer of phosphor to a thickness of 20 ⁇ m, and each carbon layer to a thickness of 10 ⁇ m, then repeat coating and drying steps to obtain a laminate.
  • This laminate A is a stack of layers formed in the repeated sequence of a red phosphor layer 2, a carbon layer (non-luminous layer 1), a green phosphor layer 3, a carbon layer (non-luminous layer 1), a blue phosphor layer 4, and a carbon layer (non-luminous layer 1).
  • the laminate is then sliced through the thickness direction thereof to a thickness of 0.02 mm by some means such as a microtome or a high-precision band-saw.
  • each phosphor layer approximately 10 to 60 ⁇ m is normally used as the thickness of each phosphor layer.
  • Figure 4 shows a state in which the laminate A is being sliced by a microtome through the thickness direction thereof to obtain a slice thereof.
  • the thus-obtained phosphor slice has 220 triplets, where 1 triplet is defined as a group of three phosphor lines.
  • composites of red, green, and blue phosphors dispersed uniformly in a burnable organic binder are coated onto film, these composites are dried to obtain films coated with each of the red, green, and blue phosphors, and the phosphor-coated films are stacked in a repeating sequence to obtain a laminate of a specific thickness.
  • the composite of the organic binder in which the phosphor is dispersed can applied to the film by a coating method using a roller-coater or by a screen-printing method, the organic solvent can be removed by drying, and the above process can be repeated.
  • Figure 2 shows the state of a coated layer 13 of a phosphor composite formed on a film 1.
  • a film with good calcination properties such as a polyvinyl alcohol or acrylic film, is preferable as the film used in this mode of the present invention; in particular, an acrylic film is preferable because of its good balance between calcination properties and flexibility.
  • the film thickness can be determined by the desired layer thickness.
  • a plastic type of film a composite in which carbon or graphite is uniformly dispersed in a resin can be used.
  • a specific example of the method of the second mode of the manufacture of the laminate is to screen-print each layer of phosphor to a thickness of 20 ⁇ m onto 20- ⁇ m thick film, then repeat coating and drying steps to obtain a laminate.
  • This laminate A is a stack of layers formed in the repeated sequence of a red phosphor layer 2, a film layer (non-luminous layer 1), a green phosphor layer 3, a film layer (non-luminous layer 1), a blue phosphor layer 4, and a film layer (non-luminous layer 1).
  • the laminate is then thinly sliced through the thickness direction thereof.
  • the slicing means could be, for example, a microtome or an extremely fine band-saw.
  • the laminate is sliced to a thickness of 20 ⁇ m.
  • Figure 4 shows the state in which the laminate A is being sliced by a microtome through the thickness direction thereof to obtain a slice thereof.
  • the thus-obtained phosphor slice has 220 triplets, where 1 triplet is defined as a group of three phosphors.
  • the thus-obtained phosphor film is either affixed or pressure-bonded to a front screen panel of a color cathode-ray tube.
  • One method of affixing the phosphor film to the front screen panel could be such that a water-soluble adhesive, for example water glass or polyvinyl alcohol, is coated onto the front screen panel, the phosphor layer is affixed thereto, and the layer is dried and fixed.
  • a water-soluble adhesive for example water glass or polyvinyl alcohol
  • one method of pressure-bonding the phosphor film could be such that, for example, a rubber roller or the like is used to press the phosphor film onto a glass baseplate in such a manner that no bubbles remain between the phosphor film and the baseplate, to fix the phosphor layer to the baseplate.
  • Figure 5 shows a slice formed of a stripe pattern of a repeated sequence of a red phosphor layer 2, a film (non-luminous layer 1), a green phosphor layer 3, a film (non-luminous layer 1), a blue phosphor layer 4, and a film (non-luminous layer 1) on a panel 5.
  • the slice formed on the panel is burned to obtain a color phosphor screen.
  • Figure 6 is a plane view of one example of a color phosphor layer provided by a phosphor layer B comprising stripes of red phosphor 2, green phosphor 3, and blue phosphor 4 on a front screen panel 5 of a color cathode-ray tube.
  • the interposing of non-luminous layers between layers of differently colored phosphors is intended to prevent color mixing at the boundaries between red, green, and blue, ensure separation of each color, and improve contrast in the image generated on the screen.
  • black stripe layers could be added to the phosphor screen in addition to providing non-luminous layers as described above.
  • black stripe layers can be formed by a vapor deposition method by which a non-luminous material with a low light-transmissivity, such as aluminum, is applied to a baseplate using a striped metal mask of a specific width.
  • the preferred material in accordance with the present invention is aluminum.
  • Carbon or graphite could also be used, but individual particles of a substance such as carbon could condense, deteriorating the linearity of the stripes.
  • the stripe width is 20 ⁇ m and the thickness of the stripe layer is 0.05 to 0.06 ⁇ m.
  • the plane view of Figure 7 shows the state of black stripes 12 formed on a panel 5.
  • One method of stacking phosphor screen and black stripe layers could be such that, for example, black stripe layers are formed on the front screen panel, then a phosphor layer is superimposed thereon in such a manner that the black stripes coincide with either boundary portions between the red, green, and blue phosphor layers or non-luminous layers.
  • Figure 8 shows the state of a phosphor layer B superimposed onto the panel 5 in such a manner that non-luminous layers 1 and black stripe layers 12 coincide.
  • the thus-obtained panel is used in the assembly shown in Figure 1 to form a color cathode-ray tube having a resolution of 220 TV lines with a panel size of 35 mm ⁇ 25 mm.
  • the present invention is suitable for realizing a higher density of a color cathode-ray tube, and can be applied for use in a color view-finder of a video camera.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP19900913735 1989-09-22 1990-09-21 Color cathode-ray tube Withdrawn EP0445298A4 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP11148289U JPH0350744U (de) 1989-09-22 1989-09-22
JP111482/89U 1989-09-22
JP26938889A JPH03133031A (ja) 1989-10-17 1989-10-17 カラー用陰極線管
JP269388/89 1989-10-17

Publications (2)

Publication Number Publication Date
EP0445298A1 true EP0445298A1 (de) 1991-09-11
EP0445298A4 EP0445298A4 (en) 1992-03-18

Family

ID=26450868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900913735 Withdrawn EP0445298A4 (en) 1989-09-22 1990-09-21 Color cathode-ray tube

Country Status (4)

Country Link
EP (1) EP0445298A4 (de)
KR (1) KR920702007A (de)
CA (1) CA2042392A1 (de)
WO (1) WO1991004568A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447554A1 (de) * 1989-10-06 1991-09-25 Mitsubishi Rayon Co., Ltd. Verfahren zur herstellung eines lumineszenten farbschirms
US6549590B2 (en) 1996-02-23 2003-04-15 Intersil Americas Inc. Current-controlled carrier tracking filter for improved spurious signal suppression

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW509960B (en) * 2000-04-04 2002-11-11 Matsushita Electric Ind Co Ltd Highly productive method of producing plasma display panel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01265426A (ja) * 1988-04-18 1989-10-23 Mitsubishi Rayon Co Ltd カラー蛍光体面の製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5847681B2 (ja) * 1973-12-15 1983-10-24 ソニー株式会社 ビサイスダレジヨウシヤコウバン
JPS5214348A (en) * 1975-07-24 1977-02-03 Toshiba Corp Film producing method
JPS5431270A (en) * 1977-08-15 1979-03-08 Toshiba Corp Index-system color picture tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01265426A (ja) * 1988-04-18 1989-10-23 Mitsubishi Rayon Co Ltd カラー蛍光体面の製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 28 (E-875)(3971) 19 January 1990 & JP-A-1 265 426 ( MITSUBISHI RAYON ) 23 October 1989 *
See also references of WO9104568A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447554A1 (de) * 1989-10-06 1991-09-25 Mitsubishi Rayon Co., Ltd. Verfahren zur herstellung eines lumineszenten farbschirms
EP0447554A4 (en) * 1989-10-06 1992-03-18 Mitsubishi Rayon Co., Ltd. Method of producing a color luminescent screen
US6549590B2 (en) 1996-02-23 2003-04-15 Intersil Americas Inc. Current-controlled carrier tracking filter for improved spurious signal suppression

Also Published As

Publication number Publication date
WO1991004568A1 (fr) 1991-04-04
EP0445298A4 (en) 1992-03-18
CA2042392A1 (en) 1991-03-23
KR920702007A (ko) 1992-08-12

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