EP0067507A2 - Ecrans pour tubes cathodiques - Google Patents

Ecrans pour tubes cathodiques Download PDF

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Publication number
EP0067507A2
EP0067507A2 EP82302090A EP82302090A EP0067507A2 EP 0067507 A2 EP0067507 A2 EP 0067507A2 EP 82302090 A EP82302090 A EP 82302090A EP 82302090 A EP82302090 A EP 82302090A EP 0067507 A2 EP0067507 A2 EP 0067507A2
Authority
EP
European Patent Office
Prior art keywords
slice
cathode ray
ray tube
different
implanted
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Withdrawn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
EP82302090A
Other languages
German (de)
English (en)
Other versions
EP0067507A3 (fr
Inventor
Brian Cockayne
John Lewis Glasper
David John Robbins
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of EP0067507A2 publication Critical patent/EP0067507A2/fr
Publication of EP0067507A3 publication Critical patent/EP0067507A3/fr
Withdrawn legal-status Critical Current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
    • H01J29/20—Luminescent screens characterised by the luminescent material

Definitions

  • This invention relates to cathode ray tube (C.R.T.) screens.
  • a typical cathode ray tube comprises an evacuated glass envelope with an electrode structure at one end and a face plate at the other end.
  • the face is internally coated with a phosphor screen formed of doped phosphor particles deposited by settlement from a suspension.
  • An electron beam is caused to sweep acrcss the screen and form an observable image, e.g. a television display.
  • a disadvantage with powder layers is their limited luminescence; increasing the electron beam current to obtain higher luminance is not possible without damaging the phosphor layer.
  • Another disadvantage is the resolution, limited by the powder particle size for single colour screen and also by diffusion for double layer screens operating on the penetron principle.
  • Such disadvantages are particularly troublesome in projection cathode ray tube displays e.g. aircraft head up displays (HUD) where an image from a small cathode ray tube is projected in front of a pilot as an image ahead of the aircraft.
  • HUD aircraft head up displays
  • Patent Specification G.B. 2,000,173 A describes a cathode ray tube screen formed by a monocrystalline body including a luminescent layer containing an activator. The layer is grown by liquid phase epitaxy or diffusion of an activator into the body. This results in a single colour light output.
  • a cathode ray tube screen comprises a single crystalline or a polycrystalline slice into which a dopant is inserted into the surface layer by ion implantation followed by annealing to remove the lattice damage caused by the implantation and to assist the diffusion of the dopant into the crystal.
  • the single crystsl slice may be a slice of yttrium aluminium garnet (YAG) and the surface layer may be produced by implanting Tb 3+ , Eu 3+ , Ce 3+ , Tm 3+ , or other suitable dopants, singly or sequentially over the whole crystal, or with different dopants in different areas.
  • the slice or layer may be a single crystal or a thin film on a different substrate (e.g. of YAG on other garnets or sapphire).
  • Other suitable crystals are compounds capable of incorporating rare-earth ions, e.g. oxides containing a lattice site of similar size and/or valency to rare-earth ions.
  • a cathode ray tube comprises an evacuated glass envelope 1 with an electrode structure 2 at one end and a front face 3 at the other end.
  • the face 3 may be a slice of single crystal yttrium aluminium garnet (YAG) on its own or bonded on the inside of a glass plate.
  • YAG yttrium aluminium garnet
  • the inside surface of the face is covered with a very thin evaporated layer of aluminium 4.
  • the yttrium aluminium garnet (YAG) crystal may be grown by conventional methods e.g. by the Czochralski technique of growth from a melt of yttrium oxide and aluminium oxide. A grown crystal of yttrium aluminium garnet is sliced and polished to the required dimensions.
  • the slice of yttrium aluminium garnet is placed in a vacuum chamber and implanted with Tb 3+ ions from a terbium chloride source at 150 kV to give around 2 x 10 16 ions/cm 2 .
  • the slice is annealed at about 1750 0 C for about 3 hours. This removes residual damage and diffuses the Tb 3+ into the crystal;
  • Figure 2 shows how the concentration decreases away from the surface.
  • an observable image is displayed on the screen 3 where struck by a scanning electron beam.
  • the light intensity varies with beam current.
  • the image appears green, the spectrum being dominated by an emission line at 544 nm of the Tb 3+ ion in the high Tb 3+ concentration region near the near surface.
  • the image appears blue caused by intrinsic defect luminescence of the bulk yttrium aluminium garnet in combination with blue lines from the Tb3+ ions in the low concentration region away from the surface.
  • a penetron two colour display may be achieved by the use of two beams at two different voltages.
  • a penetron type of screen may also be produced by ion implanting different activators to different depths using different implant energies.
  • strips of different activators may be implanted as shown in Figures 3, 4, and 5.
  • An aluminium mask 5 is formed on the yttrium aluminium garnet slice 6 by conventional photo lithographic techniques Figure 3.
  • the Tb 3+ ions are implanted 7 in the YAG slice through slots 8 in the mask 5 and the mask removed.
  • a second mask 9, Figure 4 is formed on the yttrium aluminium garnet slice 6 and ions of Eu 3+ implanted 1 0.
  • the second mask 9 is then removed, Figure 5, and the slice annealed to give a yttrium aluminium garnet slice 6 doped in with Tb 3+ and Eu 3+ in strips 7, 10 for use e.g. in a beam indexed type of colour cathode ray tube.
  • Beam index and penetron cathode ray tubes are described for example in Microelectronics Journal Vol. 11, No. 3, pp. 10-23, D. J. Robbins.
  • a thin e.g. 300 ⁇ thick layer of aluminium is evaporated onto the yttrium aluminium garnet slice to prevent screen charging during operation, and is etched into two interdigital comb shaped structures 11, 12 respectively overlying the Tb and Eu doped strips 7, 10 to provide a beam index signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Luminescent Compositions (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP82302090A 1981-05-19 1982-04-23 Ecrans pour tubes cathodiques Withdrawn EP0067507A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8115379 1981-05-19
GB8115379 1981-05-19

Publications (2)

Publication Number Publication Date
EP0067507A2 true EP0067507A2 (fr) 1982-12-22
EP0067507A3 EP0067507A3 (fr) 1983-05-04

Family

ID=10521918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302090A Withdrawn EP0067507A3 (fr) 1981-05-19 1982-04-23 Ecrans pour tubes cathodiques

Country Status (2)

Country Link
EP (1) EP0067507A3 (fr)
JP (1) JPS57196447A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014507749A (ja) * 2010-12-20 2014-03-27 ▲海▼洋王照明科技股▲ふん▼有限公司 発光素子及びその製造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2509427B2 (ja) * 1992-12-04 1996-06-19 浜松ホトニクス株式会社 イメ―ジ管

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1446268A (en) * 1973-10-29 1976-08-18 Rca Corp Method of making a semiconductor device
GB1484399A (en) * 1976-05-04 1977-09-01 Standard Telephones Cables Ltd Method of annealing a body of iron-implanted semiconducto
GB2000173A (en) * 1977-06-24 1979-01-04 Philips Nv Luminescent screen
US4179638A (en) * 1978-06-29 1979-12-18 Corning Glass Works Cathode ray tube panel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1446268A (en) * 1973-10-29 1976-08-18 Rca Corp Method of making a semiconductor device
GB1484399A (en) * 1976-05-04 1977-09-01 Standard Telephones Cables Ltd Method of annealing a body of iron-implanted semiconducto
GB2000173A (en) * 1977-06-24 1979-01-04 Philips Nv Luminescent screen
US4179638A (en) * 1978-06-29 1979-12-18 Corning Glass Works Cathode ray tube panel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014507749A (ja) * 2010-12-20 2014-03-27 ▲海▼洋王照明科技股▲ふん▼有限公司 発光素子及びその製造方法

Also Published As

Publication number Publication date
JPS57196447A (en) 1982-12-02
EP0067507A3 (fr) 1983-05-04

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Inventor name: ROBBINS, DAVID JOHN

Inventor name: COCKAYNE, BRIAN

Inventor name: GLASPER, JOHN LEWIS