EP0311938A2 - Dispositif plat de visualisation d'image - Google Patents

Dispositif plat de visualisation d'image Download PDF

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Publication number
EP0311938A2
EP0311938A2 EP19880116733 EP88116733A EP0311938A2 EP 0311938 A2 EP0311938 A2 EP 0311938A2 EP 19880116733 EP19880116733 EP 19880116733 EP 88116733 A EP88116733 A EP 88116733A EP 0311938 A2 EP0311938 A2 EP 0311938A2
Authority
EP
European Patent Office
Prior art keywords
display device
image display
flat image
tub
base plate
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Withdrawn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
EP19880116733
Other languages
German (de)
English (en)
Inventor
Stefan Speh
Kurt-Manfred Tischer
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.)
Nokia Deutschland GmbH
Original Assignee
Nokia Graetz GmbH
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 Nokia Graetz GmbH filed Critical Nokia Graetz GmbH
Publication of EP0311938A2 publication Critical patent/EP0311938A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/126—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using line sources

Definitions

  • the invention relates to a flat image display device having a vacuum in the interior and having a front plate made of glass with a layer of fluorescent dots and a metal trough as the rear side according to the preamble of claim 1.
  • German patent application P 36 22 259.3 such a flat image display device sealed under vacuum has been proposed.
  • the proposed structure was chosen so that the planar cathode formed from the periodic arrangement of the heating wires only required a low power with a uniform and high brightness of the layer of phosphor dots. No information has been given on the structure and mounting of the components in the tub.
  • the invention has for its object to provide a stable structure for such a flat image display device for the components present in the tub, which at the same time allows simple manufacture of the flat image display device.
  • the combination of the components to be installed in the tub into a single component results in a problem-free construction outside the tub and a simplified assembly of the flat image display device.
  • this component can be easily replaced in the event of a fault.
  • the flat image display device is shown in a longitudinal section.
  • the glass front plate 1 forms with the tub 2 arranged on its rear side a closed housing which is evacuated.
  • the phosphor dots 3 are preferably of a black matrix surround.
  • the tub 2 is preferably made of pure iron and is provided on all sides with a surface protection made of a thin layer of nickel.
  • the electrodes required for the operation of the flat image display device i.e. the periodic arrangement of the heating wires 4, the segmented counterelectrode on the base plate 10, the perforated pull anode 6 and the control arrangement 7 are mechanically combined into one component.
  • This component is fastened in the tub 2 with the aid of holding members 13 (FIG. 3).
  • multipole electrical feedthroughs 8 (only two shown) are arranged in a vacuum-tight manner, with the aid of which the electrical connections of the individual electrodes are guided to the outside.
  • a re-softening glass solder can be used for soldering.
  • the type 4210 from Schott is suitable as a glass solder. This has the advantage that, in the event of a fault, the glass front plate 2 with its phosphor 3 coating can be recovered in a simple manner.
  • getter wires 22 are installed in the trough 2 below the counter electrode 5.
  • This can preferably be a product from SAES, Italy, which can be activated by passage of current and evaporates without residue.
  • Each two getter wires are connected with their first connections to the pins 21, the part of the vacuum-tight bushings 23 are.
  • the second connections of the getter wires are attached to the bottom of the tub 2, so that the getter wires can be activated by applying a current source to the lead-through pins 21 and the tub 2.
  • the getter wires are installed in such a way that the evaporating getter material takes up as large an area as possible of the space enclosed by the base plate 10 and the bottom of the tub. It is also possible to use non-evaporable getter strips which are activated by passage of current, such as the St 101 product from SAES.
  • the component to be installed in the tub 2 (FIG. 2) consists of the base plate 10 and a frame 11, to which insulating holding rods 12 are fastened.
  • the base plate 10 carries the holding members 13, by means of which it is attached to the tub 2 (Fig. 3).
  • the frame 11 rests on the base plate 10 via distance insulators 14. With the aid of screw or rivet connections 15, which are surrounded by a ceramic bushing 16 in the area of the base plate 10, the frame is firmly connected to the base plate. These connections are preferably present near the corners of the base plate.
  • the holding rods 12 are arranged via webs 19, which are made of an electrically insulating material, e.g. Glass.
  • the segmented counterelectrode 5 is present on the side of the base plate 10 opposite the luminescent layer 3.
  • the segments of the counter electrode are connected to the base plate 10 via insulators or insulator strips.
  • In front of it is the periodic arrangement of the heating wires 4, which forms a flat cathode.
  • the heating wires 4 are each fixed at one end attached to a contact piece 17 attached to the holding rod 12.
  • the other end of the heating wires 4 is connected to the holding rod 12 via a spring 20.
  • the structure is space-saving if a contact piece 17 with a spring 20 always alternates on the holding rods.
  • the contact pieces 17 and the springs 20 extend through the holding rods 12 and are provided there with wires 19 which are connected to the connecting pins of the bushings 8.
  • the frame 11 carries on its side pointing to the periodic arrangement of the heating wires 4 the perforated pull anode 6.
  • the pull anode 6 consists of a perforated metal disc which is soldered to the frame 11, for example by glass solder.
  • the pull anode has a grid of rectangular holes of the size 400 microns x 100 microns with a pitch of 1.14 mm in the horizontal direction (row direction) and 0.6 mm in the vertical direction.
  • the pull anode 6 is adjusted so that the hole centers of the holes are aligned in the horizontal direction with the centers of the segment strips. There are just as many holes in a row of the train anode as there are segment strips.
  • the pull anode 6 is fastened in the frame 11 in such a way that it is under a slight mechanical tension at the operating temperature, so that sagging is avoided.
  • the frame therefore consists of a material with such an expansion coefficient that the tensile anode is tensioned after the soldering process due to the expansion differences. This avoids a shift in the hole pattern during operation.
  • the soldering can be carried out, for example, with a crystallizing glass solder of the 7598 type from Corning at a temperature of approximately 450.degree.
  • the control arrangement 7 is applied to the pull anode 6 with the aid of an insulating adhesive or a crystallizing glass solder.
  • the control arrangement 7 consists of two mutually insulated layers of intersecting metallic conductors.
  • the resulting openings are adjusted so that they are aligned with the holes in the pull anode 6.
  • these can be provided with holes.
  • the number and location of these holes is the same as the holes in the pull anode.
  • the conductors are connected to the connecting pins of the bushings 8 via wires 18.
  • the component to be installed in the tub 2 can be held, for example, via L-shaped holding members 13 attached to the side wall of the tub 2, each of which is attached to the base plate 10 wear arranged Z-shaped holding part 24. Such a bracket is provided near each of the four corners of the base plate 10.
  • the connection between the holding part 24 and the holding member 13 can be realized, for example, by welding or soldering, but also as a releasable connection. Snap connections can preferably be used as releasable connections. This type of connection shows the advantage that the component inserted into the tub 2 can be easily removed from the tub again, for example when an error has been found during an inspection.
  • the base plate 10 can also be connected directly to the holding member 13.
  • the segments of the counterelectrode 5 lying one behind the other in the drawing plane in this figure extend to the edge of the frame 11 and are connected from there via wires 18 to the connecting pins of the bushings 8.
  • the metallic parts of the counterelectrode 5, the pulling anode 6 and the control arrangement 7 consist of pure iron and have a thin coating of nickel which may be present on all sides.
  • the flat image display device is produced as follows: the front plate 1 is provided with the layer of phosphor dots 3, the phosphor dots being surrounded by a black matrix. Mistake.
  • the bushings 8 and 23, the getter wires 22 and the holding members 13 are installed in the tub 2.
  • the electrodes to be installed in the tub 2 are assembled into one component. Then these three assemblies are assembled.
  • the front panel 1 with the layer of phosphor dots 3 is placed on the tub 2, adjusted and soldered to it in a vacuum-tight manner.
  • the flat image display device is evacuated.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP19880116733 1987-10-10 1988-10-08 Dispositif plat de visualisation d'image Withdrawn EP0311938A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3734387 1987-10-10
DE3734387 1987-10-10

Publications (1)

Publication Number Publication Date
EP0311938A2 true EP0311938A2 (fr) 1989-04-19

Family

ID=6338096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880116733 Withdrawn EP0311938A2 (fr) 1987-10-10 1988-10-08 Dispositif plat de visualisation d'image

Country Status (2)

Country Link
EP (1) EP0311938A2 (fr)
JP (1) JPH01122553A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368201A2 (fr) * 1988-11-09 1990-05-16 Nokia (Deutschland) GmbH Dispositif d'affichage plan comprenant une anode d'extraction
EP0391140A2 (fr) * 1989-04-07 1990-10-10 Nokia (Deutschland) GmbH Dispositif de visualisation plat
DE3911345A1 (de) * 1989-04-07 1990-10-11 Nokia Unterhaltungselektronik Kontaktierbauteil fuer eine flache anzeigeeinrichtung
US5256937A (en) * 1989-04-07 1993-10-26 Nokia (Deutschland) Gmbh Flat panel fluorescent screen display tube

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368201A2 (fr) * 1988-11-09 1990-05-16 Nokia (Deutschland) GmbH Dispositif d'affichage plan comprenant une anode d'extraction
EP0368201B1 (fr) * 1988-11-09 1995-02-01 Nokia (Deutschland) GmbH Dispositif d'affichage plan comprenant une anode d'extraction
EP0391140A2 (fr) * 1989-04-07 1990-10-10 Nokia (Deutschland) GmbH Dispositif de visualisation plat
DE3911345A1 (de) * 1989-04-07 1990-10-11 Nokia Unterhaltungselektronik Kontaktierbauteil fuer eine flache anzeigeeinrichtung
DE3911343A1 (de) * 1989-04-07 1990-10-11 Nokia Unterhaltungselektronik Flache anzeigeeinrichtung
EP0391140A3 (fr) * 1989-04-07 1991-08-07 Nokia (Deutschland) GmbH Dispositif de visualisation plat
US5256937A (en) * 1989-04-07 1993-10-26 Nokia (Deutschland) Gmbh Flat panel fluorescent screen display tube

Also Published As

Publication number Publication date
JPH0550091B2 (fr) 1993-07-28
JPH01122553A (ja) 1989-05-15

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Withdrawal date: 19890415