EP0003365B1 - Méthode de fabrication d'un écran d'images en couleurs plan ou courbé dans une direction; écran d'images en couleurs fabriqué par cette méthode - Google Patents
Méthode de fabrication d'un écran d'images en couleurs plan ou courbé dans une direction; écran d'images en couleurs fabriqué par cette méthode Download PDFInfo
- Publication number
- EP0003365B1 EP0003365B1 EP79100269A EP79100269A EP0003365B1 EP 0003365 B1 EP0003365 B1 EP 0003365B1 EP 79100269 A EP79100269 A EP 79100269A EP 79100269 A EP79100269 A EP 79100269A EP 0003365 B1 EP0003365 B1 EP 0003365B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- coating
- phosphor
- masks
- mask
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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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
- H01J9/2277—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by other processes, e.g. serigraphy, decalcomania
Definitions
- the present patent application relates to a method according to the preamble of patent claim 1.
- Such a method is known for example from US-PS 28 72 339 and from FR-PS 1 121 286.
- red, green and blue phosphors are applied by coating the entire area three times (sedimentation combined with spinning), exposing three times (photo technology for each color individually) and then washing off the unexposed areas and subsequent drying process before the next coating.
- the object on which the present invention is based is to produce a flat or one-way curved color screen for several colors - e.g. the three basic colors red, green and blue - especially for color picture tubes, whereby a flat or curved glass plate is used as the screen substrate.
- the cumbersome procedural steps of photo technology and the associated disadvantages should be avoided and a good adhesive strength of the phosphor layers should be guaranteed.
- the basic mask determines size, edge sharpness, separation and spacing of the dye areas and remains on the substrate with all color coatings.
- the dye areas are at least 0.01 mm 2 in size.
- a base mask made from magnetic steel sheet or from copper-beryllium sheet with magnetic nickel coating or from sheet steel with copper and / or nickel coating can be used, as can a base mask made from nickel.
- the method according to the teaching of the invention ensures that the colors do not overlap, the surfaces applied are not damaged by the mask for the following color, and the geometry of the color pigment distribution is exactly adhered to.
- the thickness of the base mask is preferably approximately 10 to 30 ⁇ m larger than the planned thickness of the phosphor layers.
- n coating masks (e.g. 3) with a defined assignment to one of the n colors (3) contain a grid with a periodicity of 1 / n (e.g. 1/3) of the basic grid.
- the respective coating masks are put on one after the other, removed and cleaned after the coating. This process is carried out n times, for each color separately. The colors are applied as a finished grid.
- the dyes can be recovered in a color-pure, simple and cost-saving manner. This is a significant advantage over conventional screen production.
- the coating of the substrate with the phosphor suspensions is carried out by pressure spraying, spray nozzles which operate without dripping when the substrate is arranged horizontally, or the spray direction is perpendicular to the substrate plate when the substrate arrangement is vertical or inclined .
- the substrate plate which is arranged at an angle of approximately 75 °, is coated up to a layer thickness of 25 Itm by passing through the spray jet several times.
- the coatings with the various masks by electrostatic spraying onto the substrate provided with a conductive layer with high voltages of 20 to 30 kV.
- the substrates are contacted on their conductive layers, for example consisting of Sn0 2 (tin oxide) (+ pole), as are the masks.
- the substrates are isolated on a magnet.
- the nozzles used are grounded (-pole). It is particularly possible to work with simple centrifugal nozzles.
- the phosphor slurry is released in a finely dosed manner.
- the coating process is so slow that a high surface coverage density with Fluorescent grains can be achieved with a low binder content, in which the layer thickness is well controllable and reproducible.
- a further possibility for covering the phosphor of the screen glass is provided by the mask screen printing process, the coating masks being formed by screen printing masks.
- This technique can only be used for formats up to a maximum of the size at which the required raster accuracy can still be maintained.
- the viscosity of the paste is adjusted so that the "windows" are filled with "colors”.
- the coating masks are put on and / or removed manually or mechanically either by mechanical or magnetic grippers.
- Figure a) shows the arrangement before coating;
- Figure e) the finished "colors" grid.
- substrate 1 In principle, four arrangements of the substrates provided with the masks, which are shown in FIGS. 2 to 5, are recommended. The same reference numerals always apply: substrate 1; Basic mask 2; Coating masks 3, 4, 5; Spray nozzles 9; Holding magnets 10.
- the sequence of the entire screen production by the phosphor coating in three colors can be seen from the diagram designated as FIG. 6.
- the process of producing the fluorescent screen is marked by solid lines with arrows, while the dashed lines with arrows point in the direction of travel of accessories.
- Analog processes are connected by dashed lines without arrows. Numbers without points and additional number indicate the number of the further processing step; this also applies to the numbers before the points. The numbers after the points show the different alternatives for the coating.
- the field with a dashed outline relates to the subject matter of the invention.
- pigment dyes in preferably water-free organic slurry liquids as the phosphors, whose particle size distribution is between a minimum of 1 to 3 ⁇ m and a maximum of 10 to 15 11 m.
- the viscosity of the emulsions is controlled in the range from 1 to 35% by volume by adding binders, preferably in the form of collodion wool (nitrated cellulose).
- the main representatives used as phosphors are: For blue, the ZnS: Ag system (zinc sulfide, doped with silver), for green the system (ZnCd) S: Cu (zinc cadmium sulfide, doped with copper), for red the system Y Z O Z S: Eu (yttrium sulfoxide, doped with europium).
- An anhydrous phosphor slurry contains approximately
- a water-containing phosphor slurry consists of
- Its characteristic feature is a long dry season. It is therefore preferably applicable for electrostatic spraying and mask screen printing or spraying on hot substrates.
- Potash water glass of various viscosities can also be used as a binder in the water-containing phosphor slurries, the proportion depending on the required viscosity being between 20 and 45% by volume.
- an annealing process is carried out in an oxygen-containing atmosphere in order to drive off organic compounds and to stabilize adhesion promoters, if present.
- 200 g of phosphor e.g. ZnS: Ag, blue, medium grain 9 approx. 8 .mu.m
- 200 g of phosphor e.g. ZnS: Ag, blue, medium grain 9 approx. 8 .mu.m
- a mixture of volatile acetates, methanol and butanol with a boiling range from 55 to 118 ° C. that is, 5 minutes at about 150 rpm.
- 200 ml of butyl acetate and 200 ml of binder collodion wool with butyl acetate and ethanol.
- the preparation is then filled into closed containers and stored in a vibrator until further processing.
- the slurry is filled in spray guns with built-in stirrer or additional material circulation system and sprayed onto the substrates through fine nozzles at a distance of approx. 10 cm.
- the decanted slurry has a particularly low concentration of clumps and has the right viscosity for electrostatic spraying.
- the fluorescent slurry is sprayed in a finely metered manner through the centrifugal nozzle, in the storage vessel of which the decanted fluorescent slurry is permanently stirred (magnetic stirring), and settles on the substrate.
- the layer thickness is adjusted to approx. 25 ⁇ m over the coating time (approx. 20 min).
- the two other slurries prepared in the same way are applied after changing the corresponding masks.
- 500 g of phosphor (e.g. Y 2 O 2 S: Eu, average grain size approx. 5 to 9) are suspended in 160 ml of ethanol for approx. 2 min with a magnetic stirrer, 190 ml of a mixture of volatile acetates with methanol and butanol with a boiling range between 55 and 118 ° C added and stirring continued for about 5 min.
- 147 ml of butyl acetate and 126 ml of binder collodion wool in butyl acetate and ethanol
- Example 1 Transfer and storage as in Example 1.
- This suspension is sprayed with drip-free spray guns either from the side or from above onto the screen glass at a distance of 10 to 15 5 cm by repeatedly moving the spray gun back and forth and moving it by hand or by an automatic movement mechanism, until a layer thickness of 15 to 20 ⁇ m is reached.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Luminescent Compositions (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Claims (20)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2804127 | 1978-01-31 | ||
| DE2804127A DE2804127C2 (de) | 1978-01-31 | 1978-01-31 | Verfahren zur Herstellung eines planen oder in einer Richtung gekrümmten Leuchtstoffschirmes für flache Farbbildanzeigegeräte |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0003365A2 EP0003365A2 (fr) | 1979-08-08 |
| EP0003365A3 EP0003365A3 (en) | 1979-08-22 |
| EP0003365B1 true EP0003365B1 (fr) | 1981-08-19 |
Family
ID=6030808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79100269A Expired EP0003365B1 (fr) | 1978-01-31 | 1979-01-30 | Méthode de fabrication d'un écran d'images en couleurs plan ou courbé dans une direction; écran d'images en couleurs fabriqué par cette méthode |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4243695A (fr) |
| EP (1) | EP0003365B1 (fr) |
| JP (1) | JPS54122972A (fr) |
| DE (1) | DE2804127C2 (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3032708C2 (de) | 1980-08-30 | 1987-01-22 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Verfahren zur Herstellung eines Dünnschicht-Magnetfeld-Sensors |
| DE3424714A1 (de) * | 1984-07-05 | 1986-02-06 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Verfahren zur herstellung eines ebenen leuchtschirmes |
| US4622272A (en) * | 1984-07-31 | 1986-11-11 | Siemens Aktiengesellschaft | Luminescent screen for picture display apparatus and method for manufacturing such device |
| US5622807A (en) * | 1994-11-14 | 1997-04-22 | Hewlett-Packard Company | Phosphor film composition for use in image capture |
| JPH10302667A (ja) * | 1997-04-28 | 1998-11-13 | Nec Kansai Ltd | カラー陰極線管とその製造方法 |
| DE102013211634A1 (de) * | 2013-06-20 | 2014-12-24 | Osram Opto Semiconductors Gmbh | Verfahren zum Herstellen eines Konversionselements |
| KR20240042288A (ko) * | 2022-09-23 | 2024-04-02 | 삼성디스플레이 주식회사 | 마스크 장치 및 마스크 장치를 이용한 레진의 도포 방법 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1462653U (fr) | ||||
| US2992919A (en) | 1956-12-13 | 1961-07-18 | Gen Electric | Method of making cathode ray tube screens |
| US3269838A (en) | 1963-03-18 | 1966-08-30 | Rca Corp | Method of making luminescent screens for cathode ray tubes |
| NL6512812A (fr) * | 1965-10-02 | 1967-04-03 | ||
| NL135549C (fr) * | 1966-04-22 | |||
| DE1537483A1 (de) | 1967-09-23 | 1969-10-23 | Telefunken Patent | Verfahren zur Herstellung eines Leuchtschirmes fuer Farbbildkathodenstrahlroehren |
| DE2219261A1 (de) * | 1972-04-20 | 1973-11-08 | Licentia Gmbh | Verfahren zum festlegen des abstandes zwischen einer lochmaske und der frontschale einer farbbildroehre |
-
1978
- 1978-01-31 DE DE2804127A patent/DE2804127C2/de not_active Expired
-
1979
- 1979-01-29 JP JP962079A patent/JPS54122972A/ja active Pending
- 1979-01-30 EP EP79100269A patent/EP0003365B1/fr not_active Expired
- 1979-01-30 US US06/007,837 patent/US4243695A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54122972A (en) | 1979-09-22 |
| EP0003365A3 (en) | 1979-08-22 |
| US4243695A (en) | 1981-01-06 |
| DE2804127C2 (de) | 1984-03-08 |
| EP0003365A2 (fr) | 1979-08-08 |
| DE2804127A1 (de) | 1979-08-02 |
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