[go: up one dir, main page]

WO2003100810A1 - Ecran fluorescent d'un tube cathodique et son procede de fabrication - Google Patents

Ecran fluorescent d'un tube cathodique et son procede de fabrication Download PDF

Info

Publication number
WO2003100810A1
WO2003100810A1 PCT/IB2003/001763 IB0301763W WO03100810A1 WO 2003100810 A1 WO2003100810 A1 WO 2003100810A1 IB 0301763 W IB0301763 W IB 0301763W WO 03100810 A1 WO03100810 A1 WO 03100810A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
black matrix
phosphor
metal
crt
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.)
Ceased
Application number
PCT/IB2003/001763
Other languages
English (en)
Inventor
Ties Van Bommel
Nicolaas P. Willard
Paulus H. G. Offermans
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to AU2003225496A priority Critical patent/AU2003225496A1/en
Publication of WO2003100810A1 publication Critical patent/WO2003100810A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H01J29/28—Luminescent screens with protective, conductive or reflective layers

Definitions

  • the present invention relates to a phosphor screen of a cathode ray tube (CRT) providing improved luminance and contrast performance, and a method of manufacturing same.
  • CRT cathode ray tube
  • a CRT comprising said phosphor screen.
  • Many different display devices such as a television receiver, commonly utilize cathode ray tubes having luminescent phosphor screens.
  • a conventional cathode ray tube (CRT) is shown in Fig. 1.
  • a CRT comprises a glass panel 1 , which on its inside has a phosphor screen 2.
  • a perforated shadow mask 3 also called a color selection electrode.
  • a tunneled part 4 is bonded to the panel 1 to form a vacuum bulb.
  • An electron gun 5 is installed inside a neck 6 at the rear end of the tunneled part 4, and a deflection unit 7 is provided on the outside of the neck 6 and the tunneled part 4.
  • Electron beams emitted from the electron gun 5 are deflected by the deflection unit 7 to land at precise locations on the phosphor screen 2, thus forming a pixel, a plurality of which form a picture.
  • CRTs without shadow masks sometimes referred to as beam indexing CRTs or intelligent tracking CRTs, are also known (not shown or further described)).
  • Fast intelligent tracking CRTs are also referred to as FIT tubes.
  • the phosphor screen includes red, green and blue phosphor layers (e.g. phosphor stripes or dots).
  • the phosphor screen comprises a structured light absorbing carbon (graphite) layer, also called a black matrix, which is formed between the respective phosphor elements, and a reflective metal back layer, typically made of aluminium.
  • graphite structured light absorbing carbon
  • the black matrix increases the contrast of the picture.
  • Electrons emitted from the electron gun pass through the perforations in the shadow mask (if a shadow mask is present) to selectively excite the separated phosphor elements.
  • the emitted electrons hit and excite the phosphor (or an activator element incorporated in the phosphor)
  • light energy in the form of photons are emitted, which travel in various directions out of the phosphor, upwards, downwards and sideward.
  • Light emitted in the direction of the viewing glass panel is seen by the viewer. However, some light is emitted in other directions away from the viewing panel.
  • the reflective metal back layer then acts to redirect or reflect this light towards the viewing panel.
  • a flat reflective aluminium layer is often used. This flat layer reflects the light back to the openings in the black matrix, i.e. this light is seen by the viewer, and to the light-absorbing black matrix. Since the phosphor lines or dots are not optically separated when a flat metal layer is used, color contamination problems, for instance red light, may occur in a green color line, and internal light reflection may occur. Furthermore, light emitted sideward is lost with regard to luminance and contrast performance (LCP).
  • LCP luminance and contrast performance
  • a dome-shaped reflective metal back layer improves the display brightness and luminance since the internal reflection and absorption of light is decreased. Furthermore, the risk of color contamination is eliminated.
  • US 5 097 175, US 5 547 411 and US 5 489 816 describe such dome-shaped reflective metal back layers forming optically separated light cavities. Color contamination might also be reduced using pigmented phosphor, i.e. blue light, for instance, will then be absorbed by the red pigment in the red light emitting phosphor.
  • color contamination there are also other factors affecting color contamination, such as the spot size of the electron beam, the light scattering power of the phosphor, the size of the phosphor lines or dots, and the reflectivity of the reflective metal back layer.
  • the phosphor 8 is not only contained within the lines or dots formed by the black matrix 9, but some phosphor 8 is also on top of the black matrix 9 as illustrated in Fig. 2.
  • the prior art phosphor screen 2 shown in Fig. 2 is provided on a panel 1 as disclosed above, and has a dome-shaped reflective metal back layer 10.
  • the light generated by the phosphor above the black matrix 9 is mostly absorbed by the black matrix 9, as illustrated in Fig. 2, and consequently this light does not add to the luminance and contrast performance (LCP).
  • LCP luminance and contrast performance
  • the black matrix 9 provides contrast, but reduces the luminance by absorbing some of the emitted light.
  • An object of the present invention is to alleviate the above problems and to provide a method of manufacturing a phosphor screen of a cathode ray tube having improved luminance and contrast performance (LCP).
  • Another object of the present invention is to alleviate the above problems and to provide a phosphor screen of a cathode ray tube (CRT), in particular a color cathode ray tube, having improved luminance and contrast performance (LCP).
  • CTR cathode ray tube
  • LCP luminance and contrast performance
  • Still another object of the present invention is to alleviate the above problems and to provide a cathode ray tube with improved luminance and contrast performance (LCP) which comprises said phosphor screen.
  • LCP luminance and contrast performance
  • a phosphor screen which comprises on an inner surface of a CRT panel a structured black matrix layer, a phosphor layer, and a reflective metal back layer (herein also referred to as top layer), wherein a one-sided reflective film is provided by said black matrix layer covered by an additional reflective metal layer (herein also referred to as bottom layer).
  • the reflective bottom layer is preferably made of aluminium. Aluminium is highly reflective, and stable in contact with phosphor. Furthermore, aluminium is in general used for the reflective back layer, which means that good compatibility will be provided between the aluminium bottom layer and the aluminium top layer.
  • Light generated by the phosphor located above the black matrix will, in the phosphor screen according to the present invention, be reflected by the reflective bottom layer which covers the structured black matrix instead of being absorbed by the black matrix as would occur in the conventional prior art CRT described above. This reflected light is then reflected again by the top layer and is eventually emitted through the openings in the black matrix. The abso ⁇ tion of emitted light is decreased which leads to an increase in the total amount of emitted light.
  • the luminance and contrast performance are improved for a CRT having a phosphor screen according to the present invention in comparison with a conventional CRT (both with a flat and a dome-shaped reflective metal back layer).
  • a CRT (with a flat top layer) comprising a phosphor screen having a reflective bottom layer as described above will provide an increase in LCP, preferably an average increase of at least about 5%, as compared to a conventional CRT (with a flat top layer).
  • optically separated light cavities having light-emitting phosphor are provided by said, preferably structured, one-sided reflective film, comprising a reflective metal layer (bottom layer) together with a reflective metal back layer (top layer).
  • This reflective metal back layer is preferably dome-shaped, but might also be rectangular or any other shape.
  • the total light output is further increased using a dome-shaped reflective top layer in comparison with a flat top layer.
  • the use of light cavities also decreases the risk of color contamination, which might otherwise occur using said reflective bottom layer.
  • potential problems with color contamination might also be effectively solved using pigmented phosphor, in combination with a dome-shaped reflective top layer or alone.
  • a CRT having a phosphor screen which comprises a reflective bottom layer as described above and a dome-shaped top layer, instead of a flat top layer, will give a further increase in LCP, preferably an additional average increase of at least about 5%.
  • a CRT which comprises a phosphor screen as described above.
  • said object and other objects are achieved with a method for manufacturing a phosphor screen of a CRT having improved luminance and contrast performance (LCP) comprising: providing a one-sided reflective film comprising a reflective metal layer covering a black matrix layer on an inner surface of a CRT panel, and applying phosphor on said panel surface comprising said film.
  • LCP luminance and contrast performance
  • the method comprises a step wherein structuring of the black matrix and the metal layer is performed simultaneously, before applying the phosphor.
  • structuring of the black matrix and the metal layer is performed simultaneously, before applying the phosphor.
  • the reflective metal layer is preferably provided and structured by: applying a metal flake suspension comprising a binder forming a metal/binder layer on a black matrix layer applied on a patterned photoresist layer on an inner surface of a CRT panel, adding a photoresist swelling agent so that the photoresist becomes swollen and partially breaks the black matrix layer and the metal/binder layer, and removing said swollen photoresist together with portions of the black matrix layer and the metal layer overlying the swollen photoresist, wherein the remaining portions of said layers provide a structured one-sided reflective film comprising light-absorbing black matrix and reflective metal.
  • a reflective metal back layer is preferably applied forming a final phosphor screen, preferably an aluminium back layer.
  • the metal flake suspension preferably is an aluminium flake suspension.
  • the metal flakes are preferably smaller than 500 ⁇ m as the stability of the metal flake suspension decreases as the flake size increases. More preferred is an aluminium flake size smaller than 100 ⁇ m.
  • the binder comprises at least one polymer, or a combination of polymers, having good film-forming properties, such as a polybutyral, poly(vinyl pyrrolidone), poly(vinyl acetate), 2-hydroxyethyl cellulose, poly(vinyl alcohol), and poly(acryl amide).
  • a polybutyral poly(vinyl pyrrolidone), poly(vinyl acetate), 2-hydroxyethyl cellulose, poly(vinyl alcohol), and poly(acryl amide).
  • the binder preferably comprises at least one polymer, or a combination of polymers, having acidic groups, most preferably carboxyl groups (-COOH), such as poly(tert-butylacrylate-co-ethylacrylate-co-methacrylic acid), carboxymethyl cellulose sodium salt, and cellulose acetate trimellitate.
  • -COOH carboxyl groups
  • Combined polymers having good film-forming properties and comprising acidic groups such as poly(vinyl acetate-co-crotonic acid), poly(styrene-co-maleic acid), poly(acrylamide-co-acrylic acid), may also be used.
  • the amount of carboxyl groups is preferably about 0.01-80% (w/w), more preferably about 10- 15% (w/w).
  • the acidic groups of the binder will react with dissolved aluminium salts and form a cross-linked polymer matrix of metal complexes.
  • This cross-linked polymer matrix provides an insoluble (e.g. in water) and mechanically stable layer.
  • the metal flake suspension is, for instance, spin coated on the black matrix layer.
  • Examples of other application methods are spraying and flow coating (slow spin coating).
  • an adhesion improving layer of a polymer comprising carboxyl groups such as a poly(acrylic acid) might advantageously be applied on top of the black matrix layer before applying the metal layer.
  • the present invention also relates to a CRT, which comprises a phosphor screen manufactured as described herein.
  • a CRT which comprises a phosphor screen manufactured as described herein.
  • an advantage of the invention is that the structured film comprising at least said black matrix and reflective metal layer is made with only one photolithographic lift-off step.
  • Another additional advantage of the invention is that the film is applied by, for instance, spin coating using an easily made and inexpensive suspension, which relatively to the conventional evaporation process for application of a reflective top layer is a rather inexpensive process.
  • Fig. 1 schematically shows the construction of a commonly used CRT.
  • Fig. 2 schematically shows a part of a phosphor screen of a CRT according to prior art.
  • Fig. 3 schematically shows a part of a phosphor screen in accordance with an embodiment of the present invention.
  • Fig. 4 shows the method steps in accordance with an embodiment of the present invention for manufacturing a phosphor screen of a CRT shown in Fig. 3.
  • FIG. 3 A part of a phosphor screen comprising a reflective bottom layer according to an embodiment of the invention is shown in Fig. 3.
  • the phosphor screen in Fig. 3 is present on an inner surface of a glass panel
  • film as used herein means a continuous or discontinuous coating.
  • a discontinuous film is meant that the film is broken in accordance with a pattern, i.e. a structured film which provides lines or dots without film.
  • a film may comprise one or more layers. Consequently, a layer may also be structured.
  • the one-sided reflective film disclosed herein comprises preferably at least two layers, i.e. black matrix and metal, but could also comprise any additional layer(s) between these two layers.
  • the light generated by the phosphor 14 located above the black matrix 12 will be reflected by the reflective bottom layer 13 instead of being absorbed by the black matrix 12 as would occur for the conventional prior art phosphor screen described above.
  • This reflected light is then reflected again by the top layer 15 and is eventually emitted through the openings in the black matrix 12.
  • the absorption of emitted light is decreased which leads to an increase in the total amount of emitted light.
  • the luminance and contrast performance are on average improved by at least about 10%, such as 14%, for a CRT according to the embodiment of the present invention described herein in comparison with a conventional CRT having a flat metal back layer (top layer).
  • the phosphor screen shown in Fig. 3 is preferably made in a process implementing a method according to an embodiment of the invention, which steps are shown in Fig. 4 and outlined below.
  • a standard, water-based photosensitised resist 16 for instance comprising poly(vinyl pyrrolidone) (PVP) and photosensitive bisazide, is applied on an inner surface of CRT glass panel 11 (step A in Fig. 4).
  • This layer 16 is thereafter exposed to UV light through a shadow mask as a result of which the exposed areas are cured.
  • the unexposed and unhardened areas are washed away with water and the remaining pattern 16 is dried.
  • a resist pattern 16 is formed (step B in Fig. 4).
  • a graphite suspension is applied and dried, thus forming a black matrix layer 12 (step C in Fig. 4).
  • a layer 13 of metal flakes suspended in water or any other solvent, such as ethanol, together with a binder is applied by slow spin coating (step D in Fig. 4).
  • the photoresist pattern 16 is then swollen by a photoresist swelling agent, such as sulfamic acid or nitric acid.
  • a photoresist swelling agent such as sulfamic acid or nitric acid.
  • 5% sulfamic acid is preferred when an ethanol suspension is used and 5% nitric acid is preferred when an aqueous suspension is used.
  • the graphite layer 12 and the metal/binder layer 13 become strongly interlinked and form an insoluble film, i.e. insoluble in, for instance, water or 5% nitric acid.
  • the double-layered film is partially and broken open in accordance with a pattern by the swollen resist dots 16' (step E in Fig. 4).
  • the swollen resist dots 16' and the black matrix 12' and the metal flakes 13' overlying the swollen resist 16' are then jointly removed by a high pressure water jet.
  • a structured, one-sided reflective, double-layered film having dots or stripes corresponding to the perforations of the shadow mask is obtained (step F in Fig. 4).
  • dots or stripes are then filled with phosphor 14 of said three colors in a manner known to persons skilled in the art. It may be noted that the phosphor 14 has a better adhesion to the aluminium layer 13 than to the black matrix 12.
  • a reflective metal back layer 15, preferably dome-shaped, is then provided using any suitable process.
  • the CRT including said double-layered film, is annealed at about 450°C to pyrolyse all organic compounds.
  • the binder in the metal/binder layer is then pyrolysed leaving a structured pure metal layer 13.
  • the essence of the process described herein is the use of the right binder.
  • the binder is a polymer, or a combination of polymers, which is soluble in alkaline water or in the solvent used, for instance ethanol, and which does not form insoluble metal complexes and which becomes insoluble when exposed to acidic water.
  • the polymer should also have good film-forming properties, and such a film should in addition be permeable to water.
  • the film should be mechanically stable during the removal of the resist dots by a pressurized water jet, and it should leave no residue after a final anneal step at about 450°C.
  • the solvent of the metal flake suspension is preferably water, since water is more environmentally desirable and more inexpensive to use than other solvents, such as ethanol.
  • a preferred binder composition is a combination of a good film-forming polymer, such as polybutyral, and a polymer having acidic groups, such as carboxyl (- COOH), sulfonic acid (-SO 3 H), phosphor containing acidic groups, e.g. phosphinic acid groups (-PO(OH) 2 ), or phenol (-C 6 H 4 OH) groups. These acidic groups will interact with the metal flakes and react with dissolved aluminium salts forming a cross-linked polymer matrix of metal complexes during the addition of the photoresist swelling agent, thus providing the closely interlinked double-layered film.
  • acidic groups such as carboxyl (- COOH), sulfonic acid (-SO 3 H), phosphor containing acidic groups, e.g. phosphinic acid groups (-PO(OH) 2 ), or
  • the acidic groups are preferably carboxyl groups, since polymers comprising carboxyl groups are less inclined ton form insoluble metal complexes in comparison to other acidic polymers. Furthermore, films formed of polymers comprising carboxyl groups are often more mechanically stable than films formed of other acidic polymers. In addition, sulfonic and phosphinic acid groups are often not completely removed during the annealing step.
  • polymers having good film-forming properties examples include polybutyral, poly( vinyl pyrrolidone), poly(vinyl acetate), and 2-hydroxyethyl cellulose.
  • polymers having good film-forming properties and which may be used in aqueous suspensions are poly(vinyl pyrrolidone), poly(vinyl alcohol), and poly(acryl amide).
  • polymers having acidic groups and which may be used in an ethanol suspension are co-polymers comprising methacrylic acid, such as poly(tert- butylacrylate-co-ethylacrylate-co-methacrylic acid).
  • polymers having acidic groups examples include carboxymethyl cellulose sodium salt and cellulose acetate trimellitate.
  • polymers having good film-forming properties and comprising acidic groups are poly(vinyl acetate-co- crotonic acid) and poly(styrene-co-maleic acid).
  • poly(acrylamide-co- acrylic acid) is poly(acrylamide-co- acrylic acid).
  • the amount of acidic groups is also important.
  • the concentration of carboxyl groups should be about 0.01-80% (w/w), preferably about 10-15% (w/w).
  • the adhesion of the metal flakes on the graphite layer may be further improved by applying a thin layer of a polymer containing carboxyl groups on top of the graphite layer before applying the metal layer.
  • This polymer could either be the same as the one used in the binder composition or it could be a different one.
  • poly(acrylic acid) may be used in the formation of this adhesion improving film.
  • Example 1 An ethanol suspension
  • the ratio of aluminium to polymers in this suspension is about 7,5:1.
  • the mass average molecular weight of the poly(vinyl-butyral-co-vinylalcohol- co-vinylacetate) used is about 70-100 000 g/mol, the vinyl butyral content is about 80% (w/w), the vinyl alcohol content is about 18-20% (w/w), and the vinyl acetate content is about 0-1.5% (w/w).
  • the poly(tert-butylacrylate-co-ethylacrylate-co-methacrylic acid) comprises on average about 23% methacrylic acid, i.e. the polymer comprises about 12% carboxyl groups.
  • a thin layer (less than 100 nm) of 100% poly(tert-butylacrylate-co-ethylacrylate-co-methacrylic acid) was applied and dried (this layer is not shown in Fig. 4).
  • the suspension comprising the aluminium, polybutyral and carboxyl- containing copolymer was then spin coated at about 150 rpm for about 30 s on top of said thin film on top of said non- structured black matrix 12.
  • the applied film 13 was then dried at about 40°C in an oven for about 5 min.
  • the aluminium flake layer 13 was about 0.5 + 0.2 ⁇ m thick. However, this thickness is reduced during the final annealing step.
  • swell the resist pattern 16 use was made of 5% sulfamic acid, pH about 1, at about 45°C for about 5 min, and the swollen resist dots 16', together with the black matrix 12' and the metal flakes 13' on top of the resist 16', were then jointly removed using a high pressure water jet spray from a Spraying Systems Autojet 125AF rig.
  • the water pressure was about 2.4 bar, the air pressure about 1.0 bar and the distance between the panel 11 and the gun was on average about 5 cm.
  • a reflective metal back layer 15 top layer is applied by any conventional process, such as an evaporation process, for the formation of light cavities.
  • the reflective back layer 15 is preferably an aluminium layer with a thickness of maximally 300 nm.
  • the CRT including said double-layered film, was annealed at about 450°C to pyrolyse all organic compounds.
  • the binder in the metal/binder layer 13 was then pyrolysed leaving a structured pure metal layer 13 of reduced thickness.
  • Example 2 An aqueous suspension 4.10 g of a 7.5% (w/w) aluminium flake suspension comprising 13.5% (w/w) polyurethane in water (Eckart Ultrastar Aqua FP-4100) was mixed with 1.49 g of a 5.2% (w/w) solution of poly(vinyl alcohol)(Merck), 0.56 g 3.0% (w/w) Rohagit SD-15 (Rohm & Haas), 0.27 g 11.0% (w/w) Tween 20 (Aldrich), 4.61 g water, and 0.21 g 5% (w/w) ammonia. This suspension was vigorously stirred for 15 min.
  • Rohagit SD-15 is a polyacrylate comprising carboxyl groups. It both contributes to the formation of aluminium complexes and increases the viscosity of the suspension.
  • Tween 20 is a polysorbate acting as a surface-active agent.
  • the average dimension of the aluminium flakes in Eckart Ultrastar Aqua FP- 4100 is about 12-14 ⁇ m with a flake thickness of 30 nm.
  • the ratio of aluminium to polymers is in this suspension about 1 :2.
  • PVA poly( vinyl alcohol)
  • the poly(vinyl alcohol) used above has a molecular weight of 72 000 g/mol and a hydrolysis grade above 88%.
  • the molecular weight and the hydrolysis grade of the PVA are important characteristics. If a polymer having a too low molecular weight is used, the resulting layer becomes fragile. If a polymer having a too high molecular weight is used, it becomes difficult, or even impossible, to structure the resulting layer. Thus, the molecular weight should be higher than 16 000 g/mol, but lower than 250 000 g/mol. The most preferred molecular weight range is about 70 000-80 000 g/mol.
  • a hydrolysis grade above 88% is preferred, and most preferred is a hydrolysis grade of about 98%.
  • a preferred pH range for the suspension is 4-9, and most preferred is pH 7-9.
  • the suspension is not stable above pH 10.
  • the above aluminium flake suspension was spin coated at 300 ⁇ m for 5 s followed by 55 s at 500 ⁇ m on top of a non-structured black matrix 12 (about 0.8 + 0.1 ⁇ m) having a resist pattern 16 underneath (formed as described above).
  • the applied film 13 was then dried at about 50°C in a hot air oven for about 15 min.
  • the aluminium flake layer 13 was about 1.0 + 0.2 ⁇ m thick. However, this thickness is reduced during the final annealing step.
  • the lines or dots between the structured double-layered film were then filled with red, green and blue phosphor 14 in a manner known to persons skilled in the art.
  • a reflective aluminium back layer 15 (top layer) is applied by any conventional process, such as an evaporation process, for the formation of light cavities.
  • the reflective back layer 15 is preferably an aluminium layer with a thickness of maximum 300 nm.
  • the CRT including said double-layered film, is annealed at about 450°C to pyrolyse all organic compounds.
  • the binder in the metal/binder layer 13 was then pyrolysed leaving a structured pure metal layer 13 of reduced thickness.
  • the reflective bottom layer disclosed herein i.e. the structured film comprising black matrix and reflective metal, may, for instance, also be used as a reflective layer in a FIT tube.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Abstract

L'invention concerne l'écran fluorescent d'un tube cathodique qui comprend une surface interne d'un panneau (11) de tube cathodique, outre une couche arrière métallique réfléchissante (15), et une couche métallique réfléchissante additionnelle (13), qui recouvre une couche matricielle noire structurée (12) fournissant un film réfléchissant d'un côté. La lumière produite par le phosphore (14) placé au-dessus de la matrice noire (12) sera reflétée par la couche réfléchissante (13) et ne sera pas absorbée par la matrice noire (12), comme ce serait le cas d'un tube cathodique classique dépourvu de cette couche réfléchissante (13). Ainsi, l'absorption de la lumière émise est réduite, ce qui entraîne une augmentation de la quantité totale de la lumière émise et une meilleure efficacité en matière de luminance et de contraste. L'invention concerne également un procédé peu coûteux de fabrication dudit écran fluorescent. L'invention concerne enfin un tube cathodique comprenant ledit écran fluorescent.
PCT/IB2003/001763 2002-05-24 2003-04-29 Ecran fluorescent d'un tube cathodique et son procede de fabrication Ceased WO2003100810A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003225496A AU2003225496A1 (en) 2002-05-24 2003-04-29 A phosphor screen of a cathode ray tube and a method of manufacturing same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP02077047 2002-05-24
EP02077047.5 2002-05-24

Publications (1)

Publication Number Publication Date
WO2003100810A1 true WO2003100810A1 (fr) 2003-12-04

Family

ID=29558367

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2003/001763 Ceased WO2003100810A1 (fr) 2002-05-24 2003-04-29 Ecran fluorescent d'un tube cathodique et son procede de fabrication

Country Status (2)

Country Link
AU (1) AU2003225496A1 (fr)
WO (1) WO2003100810A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1876476A3 (fr) * 2006-07-07 2008-01-23 Samsung Electronics Co., Ltd. Panneau d'affichage

Citations (6)

* 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
US4205255A (en) * 1977-06-29 1980-05-27 Hitachi, Ltd. Color cathode ray tube with reflective layers having apices centered between matrix windows
JPS55136428A (en) * 1979-04-09 1980-10-24 Mitsubishi Electric Corp Formation of light absorptive film
JPS56109437A (en) * 1980-01-31 1981-08-29 Mitsubishi Electric Corp Cathode-ray tube
JPS62193040A (ja) * 1986-02-19 1987-08-24 Mitsubishi Electric Corp カラ−陰極線管
JPH08203444A (ja) * 1995-01-23 1996-08-09 Mitsubishi Electric Corp 陰極線管及びその製造方法

Patent Citations (6)

* 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
US4205255A (en) * 1977-06-29 1980-05-27 Hitachi, Ltd. Color cathode ray tube with reflective layers having apices centered between matrix windows
JPS55136428A (en) * 1979-04-09 1980-10-24 Mitsubishi Electric Corp Formation of light absorptive film
JPS56109437A (en) * 1980-01-31 1981-08-29 Mitsubishi Electric Corp Cathode-ray tube
JPS62193040A (ja) * 1986-02-19 1987-08-24 Mitsubishi Electric Corp カラ−陰極線管
JPH08203444A (ja) * 1995-01-23 1996-08-09 Mitsubishi Electric Corp 陰極線管及びその製造方法

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section EI Week 199642, Derwent World Patents Index; Class V05, AN 1996-417605, XP002247683 *
PATENT ABSTRACTS OF JAPAN vol. 005, no. 007 (E - 041) 17 January 1981 (1981-01-17) *
PATENT ABSTRACTS OF JAPAN vol. 005, no. 181 (E - 083) 20 November 1981 (1981-11-20) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 038 (E - 580) 4 February 1988 (1988-02-04) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1876476A3 (fr) * 2006-07-07 2008-01-23 Samsung Electronics Co., Ltd. Panneau d'affichage
US7745996B2 (en) 2006-07-07 2010-06-29 Samsung Electronics Co., Ltd. Display panel film having a black layer and a reflective layer

Also Published As

Publication number Publication date
AU2003225496A1 (en) 2003-12-12

Similar Documents

Publication Publication Date Title
JP3035983B2 (ja) 陰極線管の製造方法
CN1023163C (zh) 在荧光屏上涂敷金属的方法
EP0824265B1 (fr) Méthode de formation d'un écran luminescent
JPH08162020A (ja) 陰極線管用フィルミング液の組成物およびこれを使用したスクリーン膜の製造方法
WO2003100810A1 (fr) Ecran fluorescent d'un tube cathodique et son procede de fabrication
US5039551A (en) Method of manufacturing a phosphor screen of a cathode ray tube
US5655941A (en) High luminescence display
WO2003100811A1 (fr) Procede de fabrication d'un enduit fluorescent pour tube cathodique
US5290648A (en) Method for manufacturing a screen for a cathode ray tube
US6590330B1 (en) Display device having a display window, a phosphor pattern and a color filter pattern between the display window and the phosphor pattern
KR100445026B1 (ko) 녹색 필터막을 채용한 음극선관 스크린막
JPH10172460A (ja) 二重層蛍光膜およびその製造方法
US6614160B1 (en) Fluorescent screen of color CRT and fabricating method thereof
KR100552626B1 (ko) 칼라음극선관의 형광막 형성방법
US20050181234A1 (en) Dispersion liquid composition for black matrix and image display device
KR200160141Y1 (ko) 블랙 코팅 음극선관 판넬
KR100284492B1 (ko) 칼라음극선관의 형광막구조 및 형성방법
US6410639B1 (en) Filming solution and method for forming a filming layer on a cathode ray tube
US5762527A (en) High luminescence display
KR100492949B1 (ko) 칼라음극선관의형광막형성방법
JPH06131973A (ja) 二層構造を持つパターン形成方法
CN1656590A (zh) 黑矩阵用分散液组合物及图像显示装置
JPH10308184A (ja) カラー陰極線管
KR19990085098A (ko) 칼라음극선관의 프리웨트액 조성물
JPH06295683A (ja) カラー蛍光面表示装置及びその製造方法並びに水溶性ポリマー含有組成物膜の積層体の形成方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP