EP0516229A1 - Bildwiedergaberöhre mit Konvergenzkorrekturanordnung - Google Patents

Bildwiedergaberöhre mit Konvergenzkorrekturanordnung Download PDF

Info

Publication number
EP0516229A1
EP0516229A1 EP92201467A EP92201467A EP0516229A1 EP 0516229 A1 EP0516229 A1 EP 0516229A1 EP 92201467 A EP92201467 A EP 92201467A EP 92201467 A EP92201467 A EP 92201467A EP 0516229 A1 EP0516229 A1 EP 0516229A1
Authority
EP
European Patent Office
Prior art keywords
correction
coils
currents
convergence
circuit
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.)
Granted
Application number
EP92201467A
Other languages
English (en)
French (fr)
Other versions
EP0516229B1 (de
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
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Priority to EP92201467A priority Critical patent/EP0516229B1/de
Publication of EP0516229A1 publication Critical patent/EP0516229A1/de
Application granted granted Critical
Publication of EP0516229B1 publication Critical patent/EP0516229B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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 provided with a 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 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
  • each correction coil is of the planar wound type and in that the arrangement of correction coils comprises at least a first and a second system of coils each subtending an angle of 360°, each system comprising a plurality of coils which jointly produce a magnetic 2N-pole field upon energization, with N being 2, 3, etc.
  • 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 high 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 foil 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 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 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 green-red/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 multi-pole 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 I12, I13, and I14 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, I12, I13, I14, 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 I1 i I f j component in the sum.
  • 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 E2PROM 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 I10, I11, I12, I13 and I14, this yields the required 5 variables. Moreover, there are vertically 5 measuring points and hence 5 comparisons. Here again it holds that these 5 comparisons are completely determined by means of 5 variables for which I f 0, I f 1, I f 2, I f 3 and I f 4 are now taken. If there were 36 measuring points, the terms I15 and I f 5 would also be necessary, etc.
  • 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.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP92201467A 1991-05-31 1992-05-22 Bildwiedergaberöhre mit Konvergenzkorrekturanordnung Expired - Lifetime EP0516229B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92201467A EP0516229B1 (de) 1991-05-31 1992-05-22 Bildwiedergaberöhre mit Konvergenzkorrekturanordnung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP91201315 1991-05-31
EP91201315 1991-05-31
EP92201467A EP0516229B1 (de) 1991-05-31 1992-05-22 Bildwiedergaberöhre mit Konvergenzkorrekturanordnung

Publications (2)

Publication Number Publication Date
EP0516229A1 true EP0516229A1 (de) 1992-12-02
EP0516229B1 EP0516229B1 (de) 1996-01-03

Family

ID=26129281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92201467A Expired - Lifetime EP0516229B1 (de) 1991-05-31 1992-05-22 Bildwiedergaberöhre mit Konvergenzkorrekturanordnung

Country Status (1)

Country Link
EP (1) EP0516229B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592038A1 (de) * 1992-10-09 1994-04-13 Koninklijke Philips Electronics N.V. Bildröhre mit Ablenkspulenträger und ein Hilfsablenkspulenträger
US5565744A (en) * 1994-11-02 1996-10-15 U.S. Philips Corporation Waveform generation
EP1028594A1 (de) * 1997-10-09 2000-08-16 Mitsubishi Denki Kabushiki Kaisha Digitale vorrichtung zur konverganzkorrektur und anzeigevorrichtung
KR100393388B1 (ko) * 1994-07-01 2003-10-17 톰슨 튜브 앤드 디스플레이 에스. 에이. 편향요크의보조코일패스너

Families Citing this family (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

Citations (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
EP0068420A2 (de) * 1981-06-24 1983-01-05 Hitachi, Ltd. Verfahren und Vorrichtung zur Konvergenzkorrektor für eine Farbkathodenstrahlröhre
EP0135072A1 (de) * 1983-07-27 1985-03-27 Hitachi, Ltd. In-Line Farbbildröhre mit magnetischer Konvergenzeinrichtung und Magnetisiergerät für die magnetische Konvergenzeinrichtung
WO1986005318A1 (fr) * 1985-03-08 1986-09-12 Deutsche Thomson-Brandt Gmbh Agengement pour reproduction d'images
GB2223124A (en) * 1985-09-30 1990-03-28 Rca Licensing Corp Blue-bow correction for crt raster

Patent Citations (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
EP0068420A2 (de) * 1981-06-24 1983-01-05 Hitachi, Ltd. Verfahren und Vorrichtung zur Konvergenzkorrektor für eine Farbkathodenstrahlröhre
EP0135072A1 (de) * 1983-07-27 1985-03-27 Hitachi, Ltd. In-Line Farbbildröhre mit magnetischer Konvergenzeinrichtung und Magnetisiergerät für die magnetische Konvergenzeinrichtung
WO1986005318A1 (fr) * 1985-03-08 1986-09-12 Deutsche Thomson-Brandt Gmbh Agengement pour reproduction d'images
GB2223124A (en) * 1985-09-30 1990-03-28 Rca Licensing Corp Blue-bow correction for crt raster

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592038A1 (de) * 1992-10-09 1994-04-13 Koninklijke Philips Electronics N.V. Bildröhre mit Ablenkspulenträger und ein Hilfsablenkspulenträger
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
KR100393388B1 (ko) * 1994-07-01 2003-10-17 톰슨 튜브 앤드 디스플레이 에스. 에이. 편향요크의보조코일패스너
US5565744A (en) * 1994-11-02 1996-10-15 U.S. Philips Corporation Waveform generation
EP1028594A1 (de) * 1997-10-09 2000-08-16 Mitsubishi Denki Kabushiki Kaisha Digitale vorrichtung zur konverganzkorrektur und anzeigevorrichtung
EP1028594A4 (de) * 1997-10-09 2003-09-10 Nec Mitsubishi Electric Visual Digitale vorrichtung zur konverganzkorrektur und anzeigevorrichtung

Also Published As

Publication number Publication date
EP0516229B1 (de) 1996-01-03

Similar Documents

Publication Publication Date Title
US4027219A (en) Device for displaying color television images
JPH0736623B2 (ja) インラインカラ−受像管装置
US5436536A (en) Display tube including a convergence correction device
EP0516229B1 (de) Bildwiedergaberöhre mit Konvergenzkorrekturanordnung
JPS5832451B2 (ja) 静的ビ−ム集中機能付与方法およびそのための装置
EP0600540B1 (de) Farbbildröhre mit Konvergenzkorrekturanordnung
JPH0690095A (ja) 電気器具
EP0241057A1 (de) Farbbildröhre mit einer Ablenkeinheit mit Bildabgleichmitteln
KR880014820A (ko) 영상표시장치의 보상코일 시스템
KR870000320B1 (ko) 칼라 음극 선관장치
JP3098505B2 (ja) 磁気センサユニット及び磁界測定装置
KR930002657B1 (ko) 음극선관내의 복수의 전자빔을 수속하는 장치
EP0655766B1 (de) Bildröhre mit Korrekturspule für die Erzeugung eines axialen Korrekturfeldes
EP0245711A2 (de) Ablenkspule
US5550522A (en) Deflection unit having a ring with field correction elements, and cathode ray tube provided with said unit
EP0660364B1 (de) Anzeigegerät mit Ablenkeinheit
JPH043153B2 (de)
JPH06267456A (ja) カラーテレビジョン表示装置
EP0597533B1 (de) Ablenkeinheit mit einem mit Feldkorrekturelemente versehenem Ring und Kathodenstrahlröhre mit dieser Einheit
KR800000316B1 (ko) 간편 콘버전스 디스플레이장치
MXPA00008464A (es) Unidad de desviacion para tubos de rayos catodicos auto-convergentes, que comprende bobinas de desviacion vertical en forma de silleta.
MXPA06007691A (es) Aparato de compensacion de campo magnetico para tubos de rayos catodicos.
US6633141B1 (en) Display device with deflection means and means for influencing the distance between electron beams
JP2612333B2 (ja) コンバーゼンス装置およびその調整方法
KR920005005B1 (ko) 음극선관 표시장치

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19930517

17Q First examination report despatched

Effective date: 19940829

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19960103

REF Corresponds to:

Ref document number: 69207266

Country of ref document: DE

Date of ref document: 19960215

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020527

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020531

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020719

Year of fee payment: 11

REG Reference to a national code

Ref country code: FR

Ref legal event code: D6

REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20021107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031202

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20030522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST