GB901367A - Method of making luminescent screens and systems for producing coloured images therewith - Google Patents
Method of making luminescent screens and systems for producing coloured images therewithInfo
- Publication number
- GB901367A GB901367A GB900558A GB900558A GB901367A GB 901367 A GB901367 A GB 901367A GB 900558 A GB900558 A GB 900558A GB 900558 A GB900558 A GB 900558A GB 901367 A GB901367 A GB 901367A
- Authority
- GB
- United Kingdom
- Prior art keywords
- luminescent
- layers
- layer
- conducting
- screen
- 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
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
- H01J29/30—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
-
- 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
- H01J29/187—Luminescent screens screens with more than one luminescent material (as mixtures for the treatment of the screens)
-
- 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
- H01J29/26—Luminescent screens with superimposed luminescent layers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Luminescent Compositions (AREA)
Abstract
901,367. Colour television tubes; luminescent screens; electroluminescence. DAVOHN CORPORATION. April 19, 1958 [April 19, 1957], No. 9005/58. Class 39 (1). [Also in Group II] Method of making a luminescent screen, for use in colour television tubes or electronic display tubes, or for excitation by U.V. rays, X-rays or gamma rays, or for electroluminescent devices with or without photo-conductive layers, comprises the steps of condensing in a high vacuum vaporized solid components of a first luminescent material on a transparent base, e.g. of glass, to form a first thin transparent or translucent film thereon, and then subjecting the film and base to a baking temperature between 500‹ C. and 1200‹ C., further condensing in a high vacuum vaporized solid components of a second luminescent material on top of the first film to form a second thin transparent or translucent film thereon, and then subjecting the base, the first film and second film to a baking temperature between 500‹ C. and 1200‹ C. The second luminescent material can produce light of a different colour when excited than the light produced by the first material. The baking temperature of the first luminescent material should be equal to or greater than that of the second luminescent material. Electrically conducting or non-conducting layers of transparent non-luminescent material can separate the luminescent films from each other and from the base. Light-absorbing means can be placed behind the screen, e.g. in a C.R.T. the interior of the tube can be made black. The luminescent films can be of the materials and formed by the method described in Specification 900,582. In one specific example, Fig. 2, a three-layer screen of zinc silicate 15, magnesium silicate 14 and calcium tungstate 13, each activated by manganese, is described, and the magnesium silicate can be formed in two layers. A conducting transparent layer 18 is formed on top of the last film or next to the base 11 and can be of a metal, tin oxide or copper iodide. The non-luminescent, transparent layers 16, 17, 12 separating the luminescent layers from each other and from the base 11 can be formed by evaporating and depositing layers of non-conducting silicon dioxide, siliconmonoxide or titanium dioxide. A grid 20 is spaced a short distance from the conducting layer 18. To produce differently coloured images the depth of penetration of a scanning electron beam into the layers is varied by varying the potential difference between the layer 18 and the grid 20. Two depths of penetration of the electron beam to the various layers are used to produce combined colours. The conducting layer 18 is about 500 Š thick, the luminescent layer 13 is between 2000 and 5000 Š thick, the luminescent layer 14 is between about 5000 Š and 2 microns thick and the luminescent layer 15 is between I and 3 microns thick. Each of the non-luminescent layers 12, 16 and 17 is between 2000 and 5000 Š thick. The layers 13, 14 and 15 luminesce in blue, red and green, respectively. Layers luminescing in other than the primary colours can be additionally provided. In a modified construction an additional redluminescing layer is provided and the blueluminescing layer is titanium activated calciummagnesium silicate. Combined colours are obtained by causing the electron beam to penetrate to positions between the luminescent layers. A circuit system for controlling the depth of penetration of the electron beam in the screen of Fig. 2 is referred to and is as described in U.S.A. Specification 2,580,073, a separate field scan being used for each colour. A modification of this system for the modified screen referred to above is also referred to, one single scan being used. A method of varying the depth of penetration of the electron beam in the screen by varying the angle at which the electron beam enters the screen as described in Specification 901,368 is also referred to. Another method of controlling the depth of penetration of the electron beam into the luminescent screen is shown in Fig. 5, in which transparent conducting layers 56 and 57 of titanium oxide or copper iodide, instead of non conducting layers, separate the luminescent layers 13, 14 and 15, a non-conducting layer 12 separating the luminescent layer 15 from the base 11. Leads 44, 45, 46 and 47 connect the layers 56, 57, the conducting layer 18 and the grid 20 to the colour control circuit 25 for varying the potentials thereto.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US65386757A | 1957-04-19 | 1957-04-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB901367A true GB901367A (en) | 1962-07-18 |
Family
ID=24622595
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB900558A Expired GB901367A (en) | 1957-04-19 | 1958-04-19 | Method of making luminescent screens and systems for producing coloured images therewith |
GB97562D Expired GB901368A (en) | 1957-04-19 | 1958-04-19 | A system for producing coloured images |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB97562D Expired GB901368A (en) | 1957-04-19 | 1958-04-19 | A system for producing coloured images |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE566917A (en) |
DE (1) | DE1422426A1 (en) |
GB (2) | GB901367A (en) |
NL (1) | NL226503A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2176047A (en) * | 1985-04-29 | 1986-12-10 | Emi Ltd | Cathode ray tubes |
-
0
- NL NL226503D patent/NL226503A/xx unknown
- BE BE566917D patent/BE566917A/xx unknown
-
1958
- 1958-04-16 DE DE19581422426 patent/DE1422426A1/en active Pending
- 1958-04-19 GB GB900558A patent/GB901367A/en not_active Expired
- 1958-04-19 GB GB97562D patent/GB901368A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2176047A (en) * | 1985-04-29 | 1986-12-10 | Emi Ltd | Cathode ray tubes |
Also Published As
Publication number | Publication date |
---|---|
BE566917A (en) | |
DE1422426A1 (en) | 1969-05-29 |
GB901368A (en) | 1962-07-18 |
NL226503A (en) |
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