EP0516229B1 - Tube reproducteur d'image muni d'un dispositif de correction de convergence - Google Patents

Tube reproducteur d'image muni d'un dispositif de correction de convergence Download PDF

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Publication number
EP0516229B1
EP0516229B1 EP92201467A EP92201467A EP0516229B1 EP 0516229 B1 EP0516229 B1 EP 0516229B1 EP 92201467 A EP92201467 A EP 92201467A EP 92201467 A EP92201467 A EP 92201467A EP 0516229 B1 EP0516229 B1 EP 0516229B1
Authority
EP
European Patent Office
Prior art keywords
coils
correction
currents
convergence
pole
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
EP92201467A
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German (de)
English (en)
Other versions
EP0516229A1 (fr
Inventor
Ronald Van Der Wilk
Jacobus Hubertus Theodoor Jamar
Bernardus Hendrikus Johannes Dekkers
Ronald Johannes Jacobus De Man
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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Publication date
Application filed by Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP92201467A priority Critical patent/EP0516229B1/fr
Publication of EP0516229A1 publication Critical patent/EP0516229A1/fr
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    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/702—Convergence correction arrangements therefor
    • H01J29/703—Static convergence systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/70—Electron beam control outside the vessel
    • H01J2229/703—Electron beam control outside the vessel by magnetic fields
    • H01J2229/7032—Conductor design and distribution
    • H01J2229/7035—Wires and conductors
    • H01J2229/7036—Form of conductor
    • H01J2229/7037—Form of conductor flat, e.g. foil, or ribbon type

Definitions

  • the invention relates to a display device having a display tube, of the type producing three electron beams lying in one plane, provided with display screen and a tube neck located opposite thereto, and including a convergence correction device which comprises an arrangement of correction coils arranged around the tube neck, and a convergence correction circuit for applying correction currents to the correction coils.
  • United States Patent US 4,027,219 describes a device in which eight or twelve coils (solenoids) wound on cores of a ferromagnetic material are arranged in a row around the tube in such a way that their axes are coplanar, while they are incorporated in a circuit having controllable current sources in such a way that, upon energization, two four-pole fields and two six-pole fields are generated whose intensity and polarity are controllable for obtaining (static) convergence.
  • coils solenoids
  • the display device of the type described in the opening paragraph is therefore characterized in that the arrangement of correction coils comprises at least a first and a second system of coils arranged around each other, each system of coils subtending an angle of 360°, and each system of coils comprising a plurality of 2N coils which jointly produce a magnetic 2N-pole field upon energization, where N is 2, 3, etc., to displace the outer beams relatively to the central beam, that the turns of each correction coil are arranged on a portion of a substantially cylindrical surface and that the correction coils are coreless.
  • the invention is based on the use of (coreless) coils having (for example concentric) conductor turns which are present on a (cylindrical) surface.
  • This provides the possibility of easily placing a system or a number of systems of such coils in a position close to the neck glass of the display tube (small diameter of the cylinder) so that a hign sensitivity is possible.
  • the inductance is low due to the absence of cores.
  • particularly coils referred to as print coils
  • print coils are suitable which are arranged on a surface of a flexible support by means of a printing technique, the support surrounding the tube neck in such a way that the axes of the coils are radially directed towards the axis of the tube neck. All this provides greater freedom of design. More particularly, a separate system of coils can be used for each multipole field to be generated.
  • two sets of four (print) coils one for generating a four-pole x field and one for generating a four-pole y field
  • two sets of six (print) coils one for generating a six-pole x field and one for generating a six-pole y field.
  • Each set of coils may be arranged on its own flexible support, while the two sets of coils each producing a four-pole field may be arranged on one and the same flexible support (which is folded or rolled up in such a way that the sets of coils form a winding, one surrounding the other), similarly as the two coils each producing a six-pole field, or (and preferably) all correction coil systems may be arranged on one and the same flexible support which is wound around the tube a number of times (hereinafter also referred to as foil coil system).
  • foil coil system hereinafter also referred to as foil coil system
  • the use of a coil system as described above is particularly suitable to be combined with a convergence correction circuit supplying the previously fixed correction currents for a number of positions on the display screen, which currents are associated with said positions.
  • This has, inter alia, the advantage that the correction signal is independent of the deflection frequencies used.
  • such a convergence correction circuit is characterized in that it comprises means for measuring the line deflection current and the field deflection current and for supplying correction currents with reference to the measured currents.
  • a first, analogous, embodiment is characterized in that the convergence correction circuit includes a multiplier circuit for supplying at least the square, the cube and the fourth power of the deflection currents as output signals.
  • the correction circuit may include a matrix circuit for multiplying, multiplying by weighting factors and adding the output signals of the multiplier circuit.
  • a second embodiment is characterized in that the convergence correction circuit includes an A/D converter for digitizing the measured deflection currents, means for digitially computing the correction currents and a D/A converter for supplying the correction currents in an analog form.
  • a very interesting possibility is presented by incorporating a memory (for example a calibrated (E)EPROM) in the correction circuit, in which memory the corrections are stored which are necessary to correct the convergence errors at a number of measuring points (for example, 25) on the display screen.
  • a memory for example a calibrated (E)EPROM
  • the corrections are stored which are necessary to correct the convergence errors at a number of measuring points (for example, 25) on the display screen.
  • the coils may be of the planar wound type having concentric external turns surrounding a central window. However, the coils have a greater sensitivity if, in accordance with a preferred embodiment of the invention, they are of the type having external turns surrounding an outer window and internal turns surrounding at least one inner window.
  • the outer and inner window(s) may be concentric or not concentric.
  • the colour display tube shown diagrammatically in Fig. 1 has a cylindrical neck portion accommodating electron guns (not visible in Fig. 1) for generating three approximately coplanar electron beams, and a funnel-shaped portion 3.
  • a deflection unit 5 which is combined with a convergence correction device 7 is arranged at the area of the interface between the two portions.
  • this correction device may comprise a plurality of coils 9 formed as flat spirals directed radially towards the axis of the tube neck 1 and being arranged in a holder 11 secured to the neck in such a way that their axes are coplanar.
  • Red-blue y errors can be corrected by means of four coils (9) which are positioned and energized in the way as shown in the embodiment of Fig. 3A.
  • Red-blue x errors can be corrected by means of four coils 9 which are positioned and energized in the way as shown in the embodiment of Fig. 3B.
  • a four-pole field having a horizontal axis direction produces a vertical displacement of the outer beams 13, 17 in opposite directions (see inset Fig. 3A) and a four-pole field having an axis direction at 45 degrees to the horizontal produces an opposite displacement in the horizontal direction (see inset Fig. 3B).
  • Green-red/blue x errors (x coma errors) (see Fig. 10A) or greenred/blue y errors (y coma errors) (see Fig. 10B) can be corrected by means of six coils which are positioned and energized in the correct way.
  • a magnetic six-pole field with an axis in the plane of the three beams 13, 15, 17, i.e. horizontal produces a simultaneous displacement of the two outer beams R(ed) and B(lue) in a direction perpendicular to the plane of the beams (Fig. 10B), while the central beam 15 is not influenced.
  • a six-pole field, an axis of which is perpendicular to the plane of the three beams (i.e. vertical) thus produces a simultaneous displacement of the outer beams R(ed) and B(lue) towards the left or the right.
  • Fig. 4 shows a coil configuration with four coils having a greater sensitivity. This results from the fact that the coils in question have a given winding distribution, with external turns surrounding an outer window and internal turns surrounding an inner window.
  • the conductors required for the correction coils are arranged on an elongate strip of synthetic material foil, said conductors being formed in this case by "multiple" wires with two parallel sub-wires having the desired distribution for four-pole x (4px), four-pole y (4py), six-pole x (6px) and six-pole y (6py).
  • the strip which is cut into four parts in connection with the space available for the Figure, is provided with a lead-out 20 to which the multipole terminals are connected.
  • the lead-out is arranged as close as possible to the conductors for the 6-poles so as to minimize the ohmic resistance and the inductance in the 6-pole circuits.
  • the strip is rolled up on a ring functioning as a support. In this case the strip surrounds the ring four times.
  • the support 7 with the coils (Fig. 5) is subsequently mounted on the deflection unit at the location reserved for this purpose (see Fig. 2) and the lead-out is fixed and provided with a connection to an electric circuit.
  • the arrangement 7 of correction coil systems may be arranged by means of a printing technique on one and the same flexible support which is wound around the tube neck a number of times and which is provided with a plurality of connection conductors connected to a connector (Fig. 5).
  • the correction coil systems may be arranged on the lower and upper sides of the flexible support, or all on the same side.
  • the use of the flexible support with printed coils renders it easily possible to arrange the coil systems in (slightly) different axial positions, if so desired.
  • the coil systems of the above-mentioned convergence correction device are to be connected to an electric circuit which supplies the suitable correction signals.
  • a correction circuit which is very well applicable within the scope of the invention is a circuit supplying correction signals as a function of the instantaneous position of the beam spot on the display screen.
  • the position of the beam/spot on the screen depends on 3 parameters, namely:
  • Fig. 8 shows a first embodiment of a correction circuit for correcting, for example, convergence errors on a display screen.
  • the correction circuit determines the position on the screen and computes the required correction current/currents with reference to this position.
  • the current I1 is applied to a multiplier circuit 52 via a current transformer 51.
  • This multiplier circuit supplies I 1 2 , I 1 3 and I 1 4 in addition to the measured horizontal deflection current I1.
  • the current I f flows through a resistor 53.
  • the voltage measured across this resistor is applied to a multiplier circuit 54.
  • Outputs of this multiplier circuit 54 supply also I f 2 , I f 3 and I f 4 in addition to the vertical deflection current I f .
  • the outputs of the multiplier circuits 52 and 54 are connected to a matrix circuit 55.
  • the required correction currents are obtained by multiplying the currents I1, I 1 2 , I 1 3 , I 1 4 , I f , I f 2 , I f 3 and I f 4 by the desired factors and by adding them.
  • the correction current Ic k has the following shape:
  • the weighting factors a ij are determined in advance and determine the weight of each I 1 i I f j component in the sum. For each type of display tube/coil combination the factors a ij will have different values. These factors are determined by displaying a known test signal on a relevant display tube/coil combination and by measuring the occurring (convergence) errors at a fixed number of measuring points (for example, 25).
  • Fig. 9 shows a second embodiment of a correction circuit.
  • the current I1 is converted to a digital value in an A/D converter 60 and stored in a memory 62.
  • the current I f is also converted to a digital value in an A/D converter 61 and stored in the memory 62.
  • a microprocessor 63 reads the stored horizontal and vertical deflection currents from the memory, (with which the location on the display screen is unambiguously determined).
  • the microprocessor receives the correction values associated with this location on the screen from an E PROM 64 and determines with reference thereto the digital values of the correction currents Ic1... Ic n and applies these values via the memory 62 at outputs to D/A converter 631 ... 63n.
  • Each D/A converter is connected to an amplifier 641 ... 64n.
  • Each output of the amplifier is connected to an output terminal 651 ... 65n of the correction circuit.
  • the analog correction currents are supplied at these output terminals.
  • the output terminals 651 ... 65n may be connected to correction coils (not shown).
  • the choice of taking 25 measuring points and determining, with reference thereto, the weighting factors a ij for generating the correction currents also determines the powers of the deflection currents required to determine the correction currents completely. Horizontally, there are 5 measuring points (in the case of 25 measuring points) and hence 5 comparisons. These 5 comparisons are completely determined by means of 5 variables. By taking I 1 0 ,I 1 1 , I 1 2 , I 1 3 and I 1 4 , this yields the required 5 variables. Moreover, there are vertically 5 measuring points and hence 5 comparisons.
  • the correction circuits shown in Figs. 8 and 9 may supply correction signals for dynamic convergence throughout the display screen. These correction circuits could also be used for other required corrections, for example, other location error corrections such as pincushion/barrel correction.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Claims (11)

  1. Dispositif d'affichage comportant un tube image du type produisant trois faisceaux d'électrons se trouvant dans un plan, pourvu d'un écran d'affichage et d'un col de tube (1) situé en face de celui-ci, et comprenant un dispositif de correction de convergence (7) qui comprend un ensemble de bobines de correction (9, 9') agencées autour du col de tube (1), et un circuit de correction de convergence pour appliquer des courants de correction aux bobines de correction (9, 9'), caractérisé en ce que l'ensemble de bobines de correction (9, 9') comprend au moins un premier et un deuxième systèmes de bobines agencés l'un autour de l'autre, chaque système de bobines sous-tendant un angle de 360° et chaque système de bobines comprenant une pluralité de 2N bobines (9, 9') qui produisent ensemble un champ magnétique 2N polaire lors de leur excitation, où N vaut 2, 3, etc., pour déplacer les faisceaux extérieurs par rapport au faisceau central, que les spires de chaque bobine de correction (9, 9') sont disposées sur une partie d'une surface sensiblement cylindrique et que les bobines de correction (9, 9') sont dépourvues de noyau.
  2. Dispositif suivant la revendication 1, caractérisé en ce que les systèmes de bobines de correction (9, 9') sont agencés sur une surface circonférentielle d'un support flexible commun disposé autour du col de tube (1), lequel support est enroulé autour du col de tube (1) en un agencement en couches.
  3. Dispositif suivant la revendication 1, caractérisé en ce que le premier système de bobines comprend quatre bobines qui produisent, lorsqu'elles sont excitées, un champ en x tétrapolaire et le deuxième système de bobines comprend quatre bobines qui produisent, lorsqu'elles sont excitées, un champ en y tétrapolaire.
  4. Dispositif suivant la revendication 1, caractérisé en ce que l'agencement des bobines de correction comprend, en outre, un troisième système de bobines comprenant six bobines qui produisent, lorsqu'elles sont excitées, un champ en x hexapolaire et un quatrième système de bobines comprenant six bobines qui produisent, lorsqu'elles sont excitées, un champ en y hexapolaire.
  5. Dispositif suivant la revendication 1, caractérisé en ce que le circuit de correction de convergence fournit des courants de correction qui sont fonction de la position instantanée du spot du faisceau sur l'écran d'affichage.
  6. Dispositif suivant la revendication 1, caractérisé en ce que le circuit de correction de convergence comprend des moyens pour mesurer le courant de déviation de ligne et le courant de déviation de trame et pour fournir des courants de correction avec référence aux courants mesurés.
  7. Dispositif suivant la revendication 6, caractérisé en ce que le circuit de correction de convergence comprend un circuit multiplicateur (52, 54) pour fournir au moins le carré, le cube et la quatrième puissance des courants de déviation comme signaux de sortie.
  8. Dispositif suivant la revendication 7, caractérisé en ce que le circuit de correction de convergence comprend un circuit matrice (55) pour multiplier les signaux de sortie du circuit multiplicateur (52, 54) par des facteurs de pondération et additionner les produits résultants.
  9. Dispositif suivant la revendication 6, caractérisé en ce que le circuit de correction de convergence comprend un convertisseur analogique/numérique (60, 61) pour numériser les courants de déviation mesurés, des moyens pour calculer numériquement les courants de correction et un convertisseur numérique/analogique (63.1, ..., 63.n) pour fournir les courants de correction sous une forme analogique.
  10. Dispositif suivant la revendication 9, caractérisé en ce que le circuit de correction de convergence est couplé à une mémoire (64) dans laquelle sont mémorisés les facteurs de pondération qui sont dépendants du type de tube image.
  11. Dispositif d'affichage comprenant un tube image du type produisant trois faisceaux d'électrons se trouvant dans un plan, comprenant un dispositif de correction de convergence (7) qui comprend un support annulaire supportant une pluralité de bobines de correction (9, 9') dont les axes sont coplanaires et un circuit de convergence pour appliquer des courants de correction aux bobines de correction (9, 9'), caractérisé en ce que le support comprend au moins un premier et un deuxième sous-support non magnétique, l'un sur l'autre, chacun sous-tendant un angle de 360°, chaque sous-support supportant une pluralité de bobines (9, 9') agencées l'une autour de l'autre, qui produisent ensemble lorsqu'elles sont excitées au moins un champ magnétique 2N polaire, où N vaut 2, 3, etc., afin de déplacer les faisceaux extérieurs par rapport au faisceau central, que chaque bobine (9, 9') comprend une pluralité de spires agencées sur une partie d'une surface sensiblement cylindrique et entourant une fenêtre et que les bobines de correction (9, 9') sont dépourvues de noyau.
EP92201467A 1991-05-31 1992-05-22 Tube reproducteur d'image muni d'un dispositif de correction de convergence Expired - Lifetime EP0516229B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92201467A EP0516229B1 (fr) 1991-05-31 1992-05-22 Tube reproducteur d'image muni d'un dispositif de correction de convergence

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP91201315 1991-05-31
EP91201315 1991-05-31
EP92201467A EP0516229B1 (fr) 1991-05-31 1992-05-22 Tube reproducteur d'image muni d'un dispositif de correction de convergence

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EP0516229A1 EP0516229A1 (fr) 1992-12-02
EP0516229B1 true EP0516229B1 (fr) 1996-01-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29721276U1 (de) * 1997-12-01 1998-02-19 Siemens AG, 80333 München Monochrom-Monitor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5485054A (en) * 1992-10-09 1996-01-16 U.S. Philips Corporation Display tube having a deflection coil support and an auxiliary deflection coil support
ATE157814T1 (de) * 1994-07-01 1997-09-15 Thomson Tubes & Displays Elektronenstrahl-ablenksystem für kathodenstrahlröhren
WO1996014714A2 (fr) * 1994-11-02 1996-05-17 Philips Electronics N.V. Generation d'ondes
KR100378327B1 (ko) * 1997-10-09 2003-03-29 엔이씨-미쓰비시덴키 비쥬얼시스템즈 가부시키가이샤 디지털 컨버전스 보정 장치 및 디스플레이 장치

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107582A (en) * 1976-07-21 1978-08-15 Stromberg Datagraphix, Inc. Character selector for a shaped beam cathode ray tube
JPS57212492A (en) * 1981-06-24 1982-12-27 Hitachi Ltd Color diviation corrector for color braun tube
JPS6028142A (ja) * 1983-07-27 1985-02-13 Hitachi Ltd 磁気コンバ−ゼンス装置を備えたインライン形カラ−受像管および磁気コンバ−ゼンス装置の製造装置
DE3508210A1 (de) * 1985-03-08 1986-10-16 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Bildwiedergabeanordnung
US4654616A (en) * 1985-09-30 1987-03-31 Rca Corporation Blue bow correction for CRT raster

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29721276U1 (de) * 1997-12-01 1998-02-19 Siemens AG, 80333 München Monochrom-Monitor

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