GB1358147A - Method of electrophotographically manufacturing a display screen of a colour television display tube - Google Patents

Method of electrophotographically manufacturing a display screen of a colour television display tube

Info

Publication number
GB1358147A
GB1358147A GB996773A GB996773A GB1358147A GB 1358147 A GB1358147 A GB 1358147A GB 996773 A GB996773 A GB 996773A GB 996773 A GB996773 A GB 996773A GB 1358147 A GB1358147 A GB 1358147A
Authority
GB
United Kingdom
Prior art keywords
colour
phosphor
conductive
pattern
photo
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
Application number
GB996773A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1358147A publication Critical patent/GB1358147A/en
Expired legal-status Critical Current

Links

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
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G8/00—Layers covering the final reproduction, e.g. for protecting, for writing thereon
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Abstract

1358147 Electro-photographic process PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 1 March 1973 [4 March 1972] 9967/73 Heading G2H [Also in Division H1] In a method of manufacturing the phosphor dot pattern of a colour television tube screen, in which the faceplate is covered, in sequence, with volatalizable conductive and photo-conductive layers, the photo-conductive layer is uniformly changed and then exposed to light to leave only the areas to be covered with a given colour phosphor charged, oppositely charged phosphor particles of that colour are deposited thereon from an insulating liquid, the process is repeated for the other phosphor colours, and finally the photo-conductor layer with the phosphor regions is uniformly charged and exposed and lightabsorbing particles from an insulating liquid are deposited between the charged phosphor regions, the invention provides that the phosphor particles of at least one colour are provided, before mixing with the insulating liquid, layer of hygroscopic material which is electrically conductive when moist, such that the phosphor pattern of that colour may be rendered conductive before the subsequent provision of a pattern of a second colour, to prevent the contamination of incompletely discharged areas of the first colour by the second colour, and may be rendered non- conductive between the provision of the final colour pattern and the light absorbing layer. The photo-conductive layer is charged by a corona discharge, and is exposed to produce for a given colour a charge pattern for e.g. red dots which are smaller than the apertures of an associated shadow mask either by employing the penumbra effect of a comparatively large light source located in turn at the blue and the green deflection centres, or by employing an annular light source located at the red deflection centre a phosphor pattern is rendered conductive by exposing to moist air, and the conductive and photo-conductive layers, which may be of polyvinyl pipenidinium chloride and polyvinyl carbarzole, respectively, are finally removed by baking. The hygroscopic material may be an aqueous solution of polyvinyl alcohol, choline chloride, and glycerine, and the light absorbing material black Fe 2 O 3 .
GB996773A 1972-03-04 1973-03-01 Method of electrophotographically manufacturing a display screen of a colour television display tube Expired GB1358147A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7202907A NL7202907A (en) 1972-03-04 1972-03-04

Publications (1)

Publication Number Publication Date
GB1358147A true GB1358147A (en) 1974-06-26

Family

ID=19815513

Family Applications (1)

Application Number Title Priority Date Filing Date
GB996773A Expired GB1358147A (en) 1972-03-04 1973-03-01 Method of electrophotographically manufacturing a display screen of a colour television display tube

Country Status (11)

Country Link
US (1) US3856518A (en)
JP (1) JPS5138216B2 (en)
AR (1) AR193568A1 (en)
AU (1) AU5268873A (en)
BE (1) BE796240A (en)
CA (1) CA982388A (en)
ES (1) ES412252A1 (en)
FR (1) FR2174936B1 (en)
GB (1) GB1358147A (en)
IT (1) IT981034B (en)
NL (1) NL7202907A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217516A (en) * 1988-04-13 1989-10-25 Mitsubishi Electric Corp Exposure device for forming phosphor deposited screen in in-line cathode ray tube

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7500288A (en) * 1975-01-10 1976-07-13 Philips Nv METHOD FOR THE ELECTROPHOTOGRAPHIC MANUFACTURE OF A DISPLAY OF A COLOR TELEVISION IMAGE TUBE.
JPS5451323U (en) * 1977-09-19 1979-04-09
JPS5934106Y2 (en) * 1978-03-08 1984-09-21 東芝ライテック株式会社 winding device
JPS54155419A (en) * 1978-05-27 1979-12-07 Anzen Dengu Kk Temperature protector for coil
DE2942109A1 (en) * 1979-10-18 1981-04-30 Philips Patentverwaltung Gmbh, 2000 Hamburg METHOD FOR PRODUCING MOLDED BODIES AND LAYERS FROM INORGANIC SUBSTANCES
NL8102224A (en) * 1981-05-07 1982-12-01 Philips Nv METHOD FOR MAKING AN IMAGE FOR A COLOR IMAGE TUBE BY ELECTROPHOTOGRAPHIC ROAD
JPS58196816U (en) * 1982-06-25 1983-12-27 セイコーエプソン株式会社 transformer
US4921767A (en) * 1988-12-21 1990-05-01 Rca Licensing Corp. Method of electrophotographically manufacturing a luminescent screen assembly for a cathode-ray-tube
US4990416A (en) * 1989-06-19 1991-02-05 Coloray Display Corporation Deposition of cathodoluminescent materials by reversal toning

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3365292A (en) * 1968-01-23 Rauland Corp Method of establishing a light absorbing design on a screen structure of an image reproducer
US3139340A (en) * 1962-01-17 1964-06-30 American Optical Corp Cathode ray tube face plates and method of making the same
US3475169A (en) * 1965-08-20 1969-10-28 Zenith Radio Corp Process of electrostatically screening color cathode-ray tubes
US3489557A (en) * 1966-03-16 1970-01-13 Zenith Radio Corp Process of electrostatically screening a color cathode-ray tube
US3489556A (en) * 1966-03-16 1970-01-13 Zenith Radio Corp Process fo electrostatically screening color cathode-ray tubes
US3615459A (en) * 1968-11-06 1971-10-26 Zenith Radio Corp Method of screening a color image reproducer
US3615462A (en) * 1968-11-06 1971-10-26 Zenith Radio Corp Processing black-surround screens
US3632339A (en) * 1969-04-28 1972-01-04 Zenith Radio Corp Method of screening a color cathode-ray tube
JPS4814499B1 (en) * 1969-07-04 1973-05-08

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217516A (en) * 1988-04-13 1989-10-25 Mitsubishi Electric Corp Exposure device for forming phosphor deposited screen in in-line cathode ray tube
US4983995A (en) * 1988-04-13 1991-01-08 Mitsubishi Denki Kabushiki Kaisha Exposure device for forming phosphor deposited screen in in-line cathode ray tube
GB2217516B (en) * 1988-04-13 1992-11-18 Mitsubishi Electric Corp Exposure device for forming phosphor deposited screen in in-line cathode ray tube

Also Published As

Publication number Publication date
FR2174936A1 (en) 1973-10-19
JPS48102973A (en) 1973-12-24
NL7202907A (en) 1973-09-07
AR193568A1 (en) 1973-04-30
BE796240A (en) 1973-09-03
IT981034B (en) 1974-10-10
JPS5138216B2 (en) 1976-10-20
DE2308178B2 (en) 1976-11-11
DE2308178A1 (en) 1973-09-13
ES412252A1 (en) 1976-01-01
US3856518A (en) 1974-12-24
AU5268873A (en) 1974-08-29
FR2174936B1 (en) 1977-09-02
CA982388A (en) 1976-01-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee