EP1205959A2 - Tube d'affichage couleur à correction dynamique de géomètrie - Google Patents

Tube d'affichage couleur à correction dynamique de géomètrie Download PDF

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Publication number
EP1205959A2
EP1205959A2 EP01127064A EP01127064A EP1205959A2 EP 1205959 A2 EP1205959 A2 EP 1205959A2 EP 01127064 A EP01127064 A EP 01127064A EP 01127064 A EP01127064 A EP 01127064A EP 1205959 A2 EP1205959 A2 EP 1205959A2
Authority
EP
European Patent Office
Prior art keywords
deflection
color picture
picture tube
compensation
field
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Withdrawn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
EP01127064A
Other languages
German (de)
English (en)
Other versions
EP1205959A3 (fr
Inventor
Siegfried Metzger
Friedrich Karl Nelle
Johann Mitrowitsch
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.)
PSI Esslingen GmbH
Original Assignee
Matsushita Electronics Europe GmbH
Matsushita Display Devices Germany GmbH
MT Picture Display Germany 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
Priority claimed from EP00124838A external-priority patent/EP1139379A3/fr
Application filed by Matsushita Electronics Europe GmbH, Matsushita Display Devices Germany GmbH, MT Picture Display Germany GmbH filed Critical Matsushita Electronics Europe GmbH
Priority to EP01127064A priority Critical patent/EP1205959A3/fr
Publication of EP1205959A2 publication Critical patent/EP1205959A2/fr
Publication of EP1205959A3 publication Critical patent/EP1205959A3/fr
Withdrawn legal-status Critical Current

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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
    • H01J29/705—Dynamic 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
    • H01J2229/56—Correction of beam optics
    • H01J2229/568—Correction of beam optics using supplementary correction devices
    • H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
    • H01J2229/5687—Auxiliary coils

Definitions

  • the non-linear deflection fields in both horizontal and vertical Direction lead to non-linear geometry distortions, as shown in FIG. 2a are reproduced.
  • This type of distortion of geometry is called “inner cushion”.
  • the pillow distortion can be seen both in the OW direction and in the NS direction.
  • the coil is replaced by an additional one Magnets premagnetized.
  • the compensation effect can still be clear be improved.
  • the one provided with a core Compensation coil pre-magnetized by additional magnets thereby the effect of the compensation can be further improved significantly.
  • the correction magnet (s) for the static magnetic fields in the additional magnet (s) for premagnetization of the compensation coil integrated. This way it becomes a particularly simple one Structure of such a color picture tube achieved.
  • the electron tube contains an electron gun 12, preferably in-line design, and is on the inside of the screen surface with a Luminous layer 10 provided. This is on the outside of the glass body 11 of the color picture tube Deflection system installed.
  • the deflection system comprises a pair of horizontal deflection coils 13, a vertical deflection coil pair 14 and a two coil pairs enclosing Ferrite core 15.
  • a coma coil 16 is arranged on the neck of the color picture tube.
  • the time course of the vertical deflection current is shown in FIG. 5.
  • the size of the vertical deflection current I v decreases from a positive maximum value that corresponds to the top edge of the screen to a negative maximum value that corresponds to the bottom edge of the screen. While at small deflection angles only a small deflection current I v flows in the middle of the image, the deflection current is considerably larger at large deflection angles. As a result, the image generated by the compensation coils varies depending on the deflection angle.
  • the basic circuit diagram of the coils of the vertical deflection circuit is shown in Fig. 6.
  • the vertical deflection circuit contains a coma coil, a vertical coil and the compensation coil. All coils of this deflection circuit are connected in series and the deflection current I v flows through them.
  • the dots next to the coil symbols in FIG. 6 indicate the polarity of each coil. It can be seen from the basic circuit diagram that the compensation coil has a polarity which is opposite to that of the other coils.
  • FIG. 8 The basic mode of operation of this arrangement according to the invention is shown in FIG. 8 played. For simplicity, only half of the pairs are opposite arranged correction magnets and compensation coils shown. Both the LV correction magnet 17 and the compensation coil 18 influence the deflection of the electron beams 24, 25, 26 of the in-line color picture tube.
  • the static correction magnetic field of the LV magnet 17 is shown by means of the solid magnetic field lines 29.
  • the compensation coil 18 is arranged in such a way that the compensation field generated by it counteracts this static field.
  • the dynamic compensation field is indicated with the aid of the interrupted compensation field lines 29. Since the compensation coil 18 is traversed by the vertical deflection current I v , the compensation field counteracts the static field the more the electron beams 24, 25, 26 are deflected, ie the closer the pixel to be generated is to the upper or lower edge of the image ,
  • the dimensioning of the compensation coil 18 must be based on the respective type of Deflection system, such as the impedance of the vertical coil to be matched. Therefore, in particular, the necessary partial effect of a static LV magnetic field and the dynamic compensation field of the coil on the electron beams be taken into account.
  • FIG. 9 shows the principle of operation of an improved embodiment of the invention.
  • the compensation coil 18 essentially corresponds to the illustration from FIG. 8.
  • the compensation coil is provided with additional magnets 31a and 31b for a premagnetization.
  • These additional magnets 31a, 31b can significantly improve the effect of the compensation, in particular if the additional magnets 31a, 31b premagnetize the compensation coil 18 (with a core 30) in such a way that it is not saturated with a deflection current I v .
  • the deflection current increases, the field of the magnets is weakened and the core 30 is moved out of saturation.
  • the non-linearity of the hysteresis curve results in a disproportionate compensation of the static magnetic field of the LV magnet 17.
  • the geometry ratio from the inside to the outside can be further improved.
  • the magnetic field lines of the Static magnetic field 28 shown as solid lines.
  • the compensation field lines the compensation coil are shown as broken lines.
  • the magnetic field of the additional magnets 31 also acts on the compensation field opposite.
  • the static magnetic field generated by the at least one additional magnet 31 is generated, is indicated by the solid magnetic field line 32.
  • the strength of the additional magnet (s) and dimensioning of the compensation coil with the core also depends on the basic error of the deflection system and Color picture tube.
  • the correction magnets 17 are in the additional magnets 31 integrated, so that the correction magnets can be dispensed with.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
EP01127064A 2000-11-14 2001-11-14 Tube d'affichage couleur à correction dynamique de géomètrie Withdrawn EP1205959A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01127064A EP1205959A3 (fr) 2000-11-14 2001-11-14 Tube d'affichage couleur à correction dynamique de géomètrie

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP00124838A EP1139379A3 (fr) 2000-03-29 2000-11-14 Tube image couleur à abérration réduite
EP00124838 2000-11-14
EP01127064A EP1205959A3 (fr) 2000-11-14 2001-11-14 Tube d'affichage couleur à correction dynamique de géomètrie

Publications (2)

Publication Number Publication Date
EP1205959A2 true EP1205959A2 (fr) 2002-05-15
EP1205959A3 EP1205959A3 (fr) 2004-02-04

Family

ID=26071593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01127064A Withdrawn EP1205959A3 (fr) 2000-11-14 2001-11-14 Tube d'affichage couleur à correction dynamique de géomètrie

Country Status (1)

Country Link
EP (1) EP1205959A3 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543701A (en) * 1978-09-20 1980-03-27 Toshiba Corp Color image receiving tube
TW498363B (en) * 2000-08-29 2002-08-11 Koninkl Philips Electronics Nv Display device comprising a deflection unit, and a deflection unit for a display device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1205959A3 (fr) 2004-02-04

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