EP0329839B1 - Dispositif de restitution d'image plat - Google Patents

Dispositif de restitution d'image plat Download PDF

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Publication number
EP0329839B1
EP0329839B1 EP88120313A EP88120313A EP0329839B1 EP 0329839 B1 EP0329839 B1 EP 0329839B1 EP 88120313 A EP88120313 A EP 88120313A EP 88120313 A EP88120313 A EP 88120313A EP 0329839 B1 EP0329839 B1 EP 0329839B1
Authority
EP
European Patent Office
Prior art keywords
deflection
line
phosphor
conductors
arrangement
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 - Lifetime
Application number
EP88120313A
Other languages
German (de)
English (en)
Other versions
EP0329839A3 (fr
EP0329839A2 (fr
Inventor
Uwe Mayer
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.)
Panasonic Holdings Corp
Original Assignee
Nokia Deutschland 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 Deutschland GmbH filed Critical Nokia Deutschland GmbH
Publication of EP0329839A2 publication Critical patent/EP0329839A2/fr
Publication of EP0329839A3 publication Critical patent/EP0329839A3/fr
Application granted granted Critical
Publication of EP0329839B1 publication Critical patent/EP0329839B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 method for operating a flat image display device according to the preamble of claim 1.
  • a flat picture display device in which a flat glass plate as the back part and a trough-shaped front part, which is provided on the inside with phosphor, form a vacuum-tight housing.
  • a large number of tungsten wires are arranged as a flat cathode in front of a segmented counterelectrode.
  • a deflection arrangement is arranged between the phosphor on the front part and the pull anodes, which deflects the electron beams within each line and from line to line. There is a threefold or a sixfold distraction within each line.
  • the invention has for its object to provide a method for operating a flat image display device, which ensures that, despite the different distance between the deflection arrangement and the phosphor, a color-pure image reproduction is achieved.
  • the flat image display device shown in cross section in FIG. 1 has a trough-shaped, outwardly curved glass front pane 1, the side walls 2 of which end in a circumferential flange 3.
  • On the inside of the windshield 1 there is fluorescent material 4 in the form of dots or strips.
  • On the back of the flat image display device there is a metal tub 5, which also has a circumferential flange 6.
  • the front pane 1 and the tub 5 are connected to one another in a vacuum-tight manner in the region of their flanges 3 and 6 by using a glass solder 7.
  • a deflection arrangement 8 Inside the flat image display device there are a deflection arrangement 8, a control arrangement 9, a perforated pull anode 15, a planar cathode made of a periodic arrangement of heating wires 10 and a counter electrode 11.
  • the electrical connections of the deflection arrangement 8 (not visible) and the control arrangement 9 are led outside through the glass solder 7, while the heating wires 10 are connected to vacuum-tight, multi-pole electrical feedthroughs 12 in the side wall 2 of the tub 5 and the counter electrode 11 to the tub .
  • the deflection arrangement 8 consists of electrical conductors 16 arranged parallel to one another, which in FIG. 1 run perpendicular to the plane of the drawing.
  • the electron beams pass between the conductors 16.
  • the electron beams are deflected in each line depending on the size and the polarity of the deflection voltages applied to two adjacent conductors 16.
  • An example is an electron beam 13 on the left edge and an electron beam 14 in the middle of the deflection arrangement considered.
  • the respective deflection areas are marked by the dashed lines 13 'and 13 ⁇ or 14' and 14 ⁇ . It can be seen that due to the curvature of the front screen 1, the distance between the deflection arrangement 8 and the phosphor 4 is different for each electron beam and for each deflected position.
  • the distance between the deflection arrangement 8 and the phosphor 4 at the location of the middle electron beam 14 is denoted by C and the distance between the middle electron beam 14 and the electron beam 13 at the edge is denoted by Y. If, as in the prior art, the deflection voltages are the same for all conductor pairs, the deflection angle is also the same for all electron beams in every row. It follows from this that the deflection width on the phosphor differs depending on the distance between the deflection arrangement 8 and the phosphor 4. This leads to a representation that is no longer pure color.
  • the deflection voltages are corrected in such a way that the respective deflection voltage is multiplied by the correction factor K.
  • the correction factor K is calculated in a first approximation from the following formula: where R is the radius of the curved windshield 1. If the deflection voltages are changed in this way, the electron beams land on the respective equidistant phosphor dots and the result is always a color-pure image.
  • the deflection arrangement 8 consists of the conductors 16 arranged parallel to one another, the electron beams passing between two adjacent conductors.
  • the electron beams are shown in FIG. 2 as a point and in their middle position.
  • the electron beam in the middle and the electron beam on the left edge as well as their associated deflection areas are provided with the associated reference numerals according to FIG. 1.
  • the deflection voltages are applied to two adjacent conductors in each case and for this purpose the conductors have electrical connections 17 which are mutually arranged on opposite sides.
  • each deflection voltage would require that each terminal 17 of each conductor 16 of the deflection arrangement 8 would have to be led out of the flat image display device.
  • the difference between the distances between the deflection arrangement and the phosphor between adjacent electron beams is so small that the use of the same deflection voltage does not lead to a visible error.
  • three groups can be formed, of which the two outer groups can in turn be electrically combined, because they have the same spatial relationships.
  • connector connectors 18 are provided to form the groups, which electrically connect the connectors 17 that belong together.
  • the deflection voltages for each line must be changed individually according to the respective distance between the deflection arrangement and the phosphor using the correction factor.
  • the measure of changing the deflection voltages with the correction factor K can be used not only in flat image display devices with a trough-shaped, curved windshield. In the case of flat image display devices with a flat front pane which bends inward under atmospheric pressure when the flat image display device is evacuated, this measure can also be used in order to achieve a color-pure display.
  • the correction factor K is calculated as described, only the sign in front of the second term has to be exchanged, so that the formula is:

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Facsimile Scanning Arrangements (AREA)

Claims (6)

  1. Principe de fonctionnement d'un écran plat de reproduction d'images, à intérieur sous vide, doté d'une surface frontale en verre revêtue de matière fluorescente, et dont la face arrière est incurvée en forme de cuvette, équipé à l'intérieur d'une treille formant cathode, devant laquelle sont disposés une anode et, entre celle-ci et la surface frontale, des éléments de commande et des éléments de déflexion qui peuvent être soumis à des tensions de déflexion à l'aide desquelles les faisceaux d'électrons peuvent être déviés dans chaque ligne,
       caractérisé par le fait que
    les tensions de déflexion peuvent être modifiées dans une valeur inversement proportionnelle à l'écart respectif entre les éléments de déflexion (8) et la matière fluorescente (4).
  2. Principe selon la revendication 1°,
       caractérisé par le fait que
    les tensions de déflexion sont modifiées au facteur
    Figure imgb0005
     où y représente l'écart du faisceau d'électrons respectif non dévié (13) par rapport au faisceau d'électrons non dévié (14) émis au centre de la ligne, R le rayon d'inflexion de la surface frontale (1) et C l'écart entre les éléments de déflexion (8) et la matière fluorescente (4) au centre de la ligne.
  3. Principe selon la revendication 2°,
       caractérisé par le fait que
    plusieurs conducteurs (16) des éléments de déflexion (8) sont respectivement regroupés et imbriqués en forme de peigne dans d'autres conducteurs (16), lesquels sont également regroupés, le faisceau d'électrons respectif passant au travers de l'interstice laissé entre une paire de conducteurs (16, 16) appartenant chacun à un groupe différent, les conducteurs (16) rassemblés dans un même groupe étant excités à une tension de déflexion corrigée identique.
  4. Principe selon la revendication 3°,
       caractérisé par le fait que
    trois groupes sont formés.
  5. Principe selon la revendication 2°,
       caractérisé par le fait que,
    sur les surfaces frontales (10̸) présentant une inflexion verticale par rapport à la direction des lignes, les tensions de déflexion sont en outre adaptéés ligne par ligne en fonction de l'écart entre la ligne respectivement projetée sur la matière fluorescente (4) de la surface frontale (10̸) et l'unité de déflexion (8).
  6. Principe selon la revendication 5°,
       caractérisé par le fait que
    cette adaptation ligne par ligne de la tension de déflexion est générée à la même valeur pour plusieurs lignes adjacentes.
EP88120313A 1988-02-25 1988-12-06 Dispositif de restitution d'image plat Expired - Lifetime EP0329839B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3805858A DE3805858A1 (de) 1988-02-25 1988-02-25 Flache bildwiedergabevorrichtung
DE3805858 1988-02-25

Publications (3)

Publication Number Publication Date
EP0329839A2 EP0329839A2 (fr) 1989-08-30
EP0329839A3 EP0329839A3 (fr) 1991-10-09
EP0329839B1 true EP0329839B1 (fr) 1994-04-13

Family

ID=6348113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120313A Expired - Lifetime EP0329839B1 (fr) 1988-02-25 1988-12-06 Dispositif de restitution d'image plat

Country Status (4)

Country Link
US (1) US4928041A (fr)
EP (1) EP0329839B1 (fr)
JP (1) JPH065477B2 (fr)
DE (2) DE3805858A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4013006A1 (de) * 1990-04-24 1991-10-31 Nokia Unterhaltungselektronik Steuervorrichtung fuer ein elektronenstrahldisplay
CA2127442C (fr) * 1992-11-06 2000-06-13 Masato Saito Afficheur d'images
GB2353633B (en) * 1996-06-13 2001-04-11 Ibm Display device
GB2320127A (en) * 1996-12-04 1998-06-10 Ibm Display device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435278A (en) * 1966-06-30 1969-03-25 Ibm Pincushion corrected deflection system for flat faced cathode ray tube
JPS58126652A (ja) * 1982-01-20 1983-07-28 Matsushita Electric Ind Co Ltd 平板型画像表示装置
JPS5991641A (ja) * 1982-11-16 1984-05-26 Matsushita Electric Ind Co Ltd 画像表示装置
JPS61264640A (ja) * 1985-05-20 1986-11-22 Matsushita Electric Ind Co Ltd 画像表示装置
DE3529041A1 (de) * 1985-08-13 1987-02-19 Siemens Ag Flache, hochaufloesende bildanzeigevorrichtung

Also Published As

Publication number Publication date
EP0329839A3 (fr) 1991-10-09
EP0329839A2 (fr) 1989-08-30
JPH01261697A (ja) 1989-10-18
JPH065477B2 (ja) 1994-01-19
US4928041A (en) 1990-05-22
DE3805858A1 (de) 1989-09-07
DE3889102D1 (de) 1994-05-19

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