WO1991009491A1 - Process for adjusting the position of the deflection raster in a television set - Google Patents

Process for adjusting the position of the deflection raster in a television set Download PDF

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Publication number
WO1991009491A1
WO1991009491A1 PCT/EP1990/002101 EP9002101W WO9109491A1 WO 1991009491 A1 WO1991009491 A1 WO 1991009491A1 EP 9002101 W EP9002101 W EP 9002101W WO 9109491 A1 WO9109491 A1 WO 9109491A1
Authority
WO
WIPO (PCT)
Prior art keywords
grid
screen
deflection
image
control pulses
Prior art date
Application number
PCT/EP1990/002101
Other languages
German (de)
French (fr)
Inventor
Günter Gleim
Jacques Chauvin
Original Assignee
Deutsche Thomson-Brandt 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 Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Publication of WO1991009491A1 publication Critical patent/WO1991009491A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/227—Centering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/28—Arrangements for convergence or focusing

Definitions

  • the invention is based on a method according to the preamble of claim 1. Such a method is preferably used to determine convergence correction values for a projection television set for certain pixels defined by the crossing points of the grid pattern and save.
  • a television set is understood to mean any device with an electronic, line-by-line image display, in particular a television receiver, a television projection device or also a monitor fed with an FBAS signal, an RGB signal or separately with the luminance signal and the color carrier .
  • the actual image is first centered relative to the screen, for example by setting a circle exactly on the center of the screen. This centering takes place in the horizontal and vertical directions. With this centering, which is effected by influencing the horizontal deflection or the vertical deflection, the grid pattern serving to determine correction values is inevitably shifted on the screen. As a result of this shift and due to temporal tolerances in the video signal, particularly in the case of image memories, if the image is centered precisely, the grid itself Term pattern no longer the target position relative to the screen. This means that the grid pattern is asymmetrical to the screen and also cross points of the grid pattern emerge from the visible screen area and are therefore lost for the determination of correction values and for the correction itself.
  • the invention has for its object to provide a method for adjusting the position of the deflection grid, which equally ensures proper centering of the image itself and compliance with the symmetrical target position of the grating pattern relative to the screen.
  • the target position of the grid pattern after centering the image is therefore not achieved by intervening in the deflection, but by changing the timing of the control pulses relative to the deflection grid which generate the grid pattern on the screen.
  • This allows tolerances of any kind to be compensated for.
  • the two settings namely the centering of the image by intervening in the deflection on the one hand and the shifting of the grating pattern by intervening in the temporal position of the control pulses on the other hand, are independent of one another. The effort is only slight because only the clock synchronization of the circuits for generating the control pulses for the grid pattern needs to be changed.
  • Fig. 1 shows the starting point in the position of the image and the grid pattern
  • Fig. 2 shows the state after centering the
  • FIG. 1 shows the screen 1, on which the image in the form of a circle 2 and the lattice pattern with the horizontal lines SH and the vertical lines SV are shown. It is assumed that the grid pattern has the symmetrical target position with respect to the screen 1, while the circle 2 is displaced by the distance s relative to the center.
  • the horizontal deflection is set so that the circle 2 has the desired centric. Position to screen 1 occupies. This can e.g. in that a direct current flowing through the horizontal deflection coils is set.
  • SV is inevitably also shifted to the right. This results in an undesirable asymmetrical position of the grating pattern relative to the screen 1 according to FIG. 2.
  • crossing points now lie outside the screen area and are therefore lost for the determination of the correction values and the correction itself.
  • FIG. 2 Such a crossing point K 1, which can no longer be used, is shown in FIG. 2. The same applies to the intersection points below. Overall, the resolution is reduced by shifting the grid pattern.
  • the control pulses which generate the vertical lines SV are changed in their temporal position relative to the deflection grid in such a way that the lines SV according to FIG. 1 assume their symmetrical position with respect to the screen 1 as in FIG. 1.
  • This setting is independent of the adjustment of the central position of the Krei ⁇ ses 2 by engagement with "the corresponding deflection circuit. in Fig. 3 therefore have both the actual picture darstel ⁇ loin circuit 2 and the lines SH, SV of the grating pattern their desired symmetrical target position relative to the screen 1.
  • the steps described in the adjustment of the image and the grid pattern can likewise take place in the vertical direction, namely by adjusting the image position via the vertical deflection on the one hand and by changing the position of the timing of the control pulses for the horizontal lines SH.
  • the timing of the control pulses for the lines SH and SV is preferably changed by changing the initial state of counters, each of which has a specific number of lines for the horizontal lines SH and a specific number of clock pulses for the vertical lines SV count, the frequency of which is substantially greater than the line frequency.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
  • Cookers (AREA)

Abstract

It is known, besides the actual image, also to set up a grid model with intersections for which the raster corrections are found and stored. The purpose is to provide a process for adjustment which ensures a properly centred position of the actual image and grid model. First of all the image (2) is centred at its exact position on the screen (1). The time position of the control pulses generating the grid model (SH, SV) relatively to the deflection raster is set. Especially for convergence correction in a projection television set.

Description

- Λ - - Λ -
Verfahren zur Einstellung der Lage des Ablenkrasters in einem FernsehgerätMethod for adjusting the position of the deflection grid in a television set
Die Erfindung geht aus von einem Verfahren gemäß dem Oberbe¬ griff des Anspruchs 1. Ein derartiges Verfahren dient vor¬ zugsweise dazu, bei einem Projektions-Fernsehgerät für be¬ stimmte, durch die Kreuzungspunkte des Gittermusters defi¬ nierte Bildpunkte Konvergenz-Korrekturwerte zu ermitteln und zu speichern. Unter Fernsehgerät wird dabei jedes Gerät mit einer elektronischen, zeilenweisen Bildwiedergabe verstan¬ den, also insbesondere ein Fernsehempfänger, ein Fernseh-Pro- jektionsgerät oder auch ein mit einem FBAS-Signal, einem RGB-Signal oder getrennt mit dem Leuchtdichtesignal und dem Farbträger gespeister Monitor.The invention is based on a method according to the preamble of claim 1. Such a method is preferably used to determine convergence correction values for a projection television set for certain pixels defined by the crossing points of the grid pattern and save. A television set is understood to mean any device with an electronic, line-by-line image display, in particular a television receiver, a television projection device or also a monitor fed with an FBAS signal, an RGB signal or separately with the luminance signal and the color carrier .
Bei der Fertigung derartiger Geräte wird zunächst das eigent¬ liche Bild relativ zum Bildschirm zentriert, indem z.B. ein Kreis genau auf die Mitte des Bildschirms eingestellt wird. Diese Zentrierung erfolgt in horizontaler und in vertikaler Richtung. Bei dieser Zentrierung, die durch Beeinflussung der Horizontal blenkung oder der Vertikalablenkung erfolgt, wird zwangsläufig auch das für die Ermittlung von Korrektur¬ werten dienende Gittermuster auf dem Bildschirm verschoben. Bedingt durch diese Verschiebung sowie durch zeitliche Tole¬ ranzen in dem Videosignal besonders bei Bildspeichern hat bei erfolgter genauer Zentrierung des Bildes selbst das Git- termuster nicht mehr die Sollage relativ zum Bildschirm. Das bedeutet, daß das Gittermuster unsymmetrisch zum Bildschirm liegt und außerdem Kreuzungspunkte des Gittermusters aus der sichtbaren Bildschirmfläche heraustreten und somit für die Ermittlung von Korrekturwerten und für die Korrektur selbst verloren gehen.When manufacturing such devices, the actual image is first centered relative to the screen, for example by setting a circle exactly on the center of the screen. This centering takes place in the horizontal and vertical directions. With this centering, which is effected by influencing the horizontal deflection or the vertical deflection, the grid pattern serving to determine correction values is inevitably shifted on the screen. As a result of this shift and due to temporal tolerances in the video signal, particularly in the case of image memories, if the image is centered precisely, the grid itself Term pattern no longer the target position relative to the screen. This means that the grid pattern is asymmetrical to the screen and also cross points of the grid pattern emerge from the visible screen area and are therefore lost for the determination of correction values and for the correction itself.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Einstellung der Lage des Ablenkrasters zu schaffen, das glei¬ chermaßen eine einwandfreie Zentrierung des Bildes selbst und die Einhaltung der symmetrischen Sollage des Gittermu¬ sters relativ zum Bildschirm gewährleistet.The invention has for its object to provide a method for adjusting the position of the deflection grid, which equally ensures proper centering of the image itself and compliance with the symmetrical target position of the grating pattern relative to the screen.
Diese Aufgabe wird durch die im Anspruch 1 angegebene Erfin¬ dung gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the invention specified in claim 1. Advantageous developments of the invention are specified in the subclaims.
Bei der Erfindung wird also die Sollage des Gittermusters nach erfolgter Zentrierung des Bildes nicht durch einen Ein¬ griff in die Ablenkung erreicht, sondern durch eine Änderung der zeitlichen Lage der Steuerimpulse relativ zum Ablenkra¬ ster, die das Gittermuster auf dem Bildschirm erzeugen. Dadurch können Toleranzen jeglicher Art ausgeglichen werden. Vorteilhaft dabei ist, daß die beiden Einstellungen, nämlich die Zentrierung des Bildes durch Eingriff in die Ablenkung einerseits und die Verschiebung des Gittermusters durch Ein¬ griff in die zeitliche Lage der Steuerimpulse andererseits, unabhängig voneinander sind. Der Aufwand ist nur gering, weil lediglich die Taktsynchronisierung der Schaltungen zur Erzeugung der Steuerimpulse für das Gittermuster geändert zu werden braucht.In the case of the invention, the target position of the grid pattern after centering the image is therefore not achieved by intervening in the deflection, but by changing the timing of the control pulses relative to the deflection grid which generate the grid pattern on the screen. This allows tolerances of any kind to be compensated for. It is advantageous here that the two settings, namely the centering of the image by intervening in the deflection on the one hand and the shifting of the grating pattern by intervening in the temporal position of the control pulses on the other hand, are independent of one another. The effort is only slight because only the clock synchronization of the circuits for generating the control pulses for the grid pattern needs to be changed.
Die Erfindung wird anhand der Zeichnung erläutert. Darin zei¬ gen Fig. 1 den Ausgangspunkt in der Lage des Bildes und des Gittermusters, Fig. 2 den Zustand nach erfolgter Zentrierung desThe invention is explained with reference to the drawing. Show in it Fig. 1 shows the starting point in the position of the image and the grid pattern, Fig. 2 shows the state after centering the
Bildes und Fig. 3 die endgültige Sollage von Bild und3 and the final target position of the image and
Gitter uster.Lattice uster.
Fig. 1 zeigt den Bildschirm 1, auf dem das Bild in Form ei¬ nes Kreises 2 und das Gittermuster mit den waagerechten Lini¬ en SH und den senkrechten Linien SV abgebildet wird. Es sei angenommen, daß das Gittermuster die symmetrische Sollage zum Bildschirm 1 hat, während der Kreis 2 um die Strecke s relativ zur Mitte verschoben ist.1 shows the screen 1, on which the image in the form of a circle 2 and the lattice pattern with the horizontal lines SH and the vertical lines SV are shown. It is assumed that the grid pattern has the symmetrical target position with respect to the screen 1, while the circle 2 is displaced by the distance s relative to the center.
In einem ersten Einstellvorgang wird die Horizontalablenkung so eingestellt, daß der Kreis 2 die gewünschte zentrische . Lage zum Bildschirm 1 einnimmt. Dies kann z.B. dadurch erfol¬ gen, daß ein durch die Horizontalablenkspulen fließender Gleichstrom eingestellt wird. Durch die Verschiebung des Ab¬ lenkrasters um die Strecke s wird zunächst zwangsläufig auch das Gittermuster SH, SV nach rechts verschoben. Dadurch er¬ gibt sich eine unerwünschte unsymmetrische Lage des Gittermu¬ sters relativ zum Bildschirm 1 gemäß Fig. 2. Wie erkennbar, liegen keine senkrechten Linien SV mehr in unmittelbarer Nä¬ he der Bildschirmkante, wie es für eine optimale Ermittlung der Korrekturwerte wünschenswert ist. Außerdem liegen jetzt Kreuzungspunkte außerhalb der Bildschirmfläche und gehen so¬ mit für die Ermittlung der Korrekturwerte und die Korrektur selbst verloren.In a first setting process, the horizontal deflection is set so that the circle 2 has the desired centric. Position to screen 1 occupies. This can e.g. in that a direct current flowing through the horizontal deflection coils is set. By shifting the deflection grid by the distance s, the grid pattern SH, SV is inevitably also shifted to the right. This results in an undesirable asymmetrical position of the grating pattern relative to the screen 1 according to FIG. 2. As can be seen, there are no more vertical lines SV in the immediate vicinity of the screen edge, as is desirable for an optimal determination of the correction values. In addition, crossing points now lie outside the screen area and are therefore lost for the determination of the correction values and the correction itself.
In Fig. 2 ist ein derartiger, nicht mehr verwertbarer Kreu¬ zungspunkt Kl dargestellt. Entsprechendes gilt für die darun¬ ter liegenden Kreuzungspunkte. Insgesamt wird also durch die Verschiebung des Gittermusters die Auflösung verringert. Gemäß Fig. 3 sind in einem zweiten Einstellvorgang die Steu¬ erimpulse, die die senkrechten Linien SV erzeugen, in ihrer zeitlichen Lage relativ zum Ablenkraster so geändert, daß die Linien SV gemäß Fig. 1 ihre symmetrische So1läge zum Bildschirm 1 einnehmen wie in Fig. 1. Diese Einstellung ist unabhängig von der Einstellung der zentrischen Lage des Krei¬ ses 2 durch Eingriff in "die entsprechende Ablenkschaltung. In Fig. 3 haben also sowohl der das eigentliche Bild darstel¬ lende Kreis 2 als auch die Linien SH, SV des Gittermusters ihre gewünschte symmetrische Sollage relativ zum Bild¬ schirm 1.Such a crossing point K 1, which can no longer be used, is shown in FIG. 2. The same applies to the intersection points below. Overall, the resolution is reduced by shifting the grid pattern. According to FIG. 3, in a second setting process the control pulses which generate the vertical lines SV are changed in their temporal position relative to the deflection grid in such a way that the lines SV according to FIG. 1 assume their symmetrical position with respect to the screen 1 as in FIG. 1. This setting is independent of the adjustment of the central position of the Krei¬ ses 2 by engagement with "the corresponding deflection circuit. in Fig. 3 therefore have both the actual picture darstel¬ loin circuit 2 and the lines SH, SV of the grating pattern their desired symmetrical target position relative to the screen 1.
Die beschriebenen Schritte in der Einstellung des Bildes und des Gittermusters können ebenso in senkrechter Richtung er¬ folgen, nämlich durch Einstellung der Bildlage über die Ver¬ tikalablenkung einerseits und durch Änderung der zeitlichen Lage der Steuerimpulse für die waagerechten Linien SH.The steps described in the adjustment of the image and the grid pattern can likewise take place in the vertical direction, namely by adjusting the image position via the vertical deflection on the one hand and by changing the position of the timing of the control pulses for the horizontal lines SH.
Die Änderung der zeitlichen Lage der Steuerimpulse für die Linien SH und SV erfolgt vorzugsweise durch Änderung des An¬ fangsstandes von Zählern, die für die waagerechten Linien SH jeweils eine bestimmte Zahl von Zeilen und für die senkrech¬ ten Linien SV jeweils eine bestimmte Zahl von Taktimpulsen zählen, deren Frequenz wesentlich größer als die Zeilenfre¬ quenz ist. The timing of the control pulses for the lines SH and SV is preferably changed by changing the initial state of counters, each of which has a specific number of lines for the horizontal lines SH and a specific number of clock pulses for the vertical lines SV count, the frequency of which is substantially greater than the line frequency.

Claims

P a t e n t a n s p r ü c h eP a t e n t a n s r u c h e
Verfahren zur Einstellung der Lage des Ablenkrasters in einem Fernsehgerät, bei dem auf dem Bildschirm außer dem eigentlichen Bild ein Gittermuster mit Kreuzungs¬ punkten abgebildet wird und für die Kreuzungspunkte Ra¬ sterkorrekturwerte ermittelt und gespeichert werden, gekennzeichnet durch folgende Maßnahmen: a) Es wird zunächst das Bild (2) auf genaue zentri¬ sche Lage zum Bildschirm (1) zentriert, b) Anschließend wird die zeitliche Lage der das Git¬ termuster (SH, SV) erzeugenden Steuerimpulse re¬ lativ zum Ablenkraster so eingestellt, daß das Gittermuster (SH, SV) eine symmetrische Sollage auf dem Bildschirm (1) hat.Method for setting the position of the deflection grid in a television set, in which a grid pattern with crossing points is shown on the screen in addition to the actual image and grid correction values are determined and stored for the crossing points, characterized by the following measures: a) First, the image (2) is centered on the exact central position relative to the screen (1), b) the time position of the control pulses generating the grid pattern (SH, SV) is then set relative to the deflection grid so that the grid pattern (SH , SV) has a symmetrical target position on the screen (1).
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zentrierung des Bildes (2) durch Änderung eines durch die Ablenkspule fließenden Gleichstroms erfolgt.Method according to Claim 1, characterized in that the centering of the image (2) takes place by changing a direct current flowing through the deflection coil.
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Änderung der zeitlichen Lag der Steuerimpulse da¬ durch erfolgt, daß der Anfangsstand von Zählern geän¬ dert wird, die für die Erzeugung der Steuerimpulse für die waagerechten Gitterlinien (SH) eine bestimmte Zahl von Zeilen und für die Erzeugung der Steuerimpulse für die senkrechten Gitterlinien (SV) eine bestimmte Zahl von Impulsen einer Impulsfolge mit gegenüber der Zeilen¬ frequenz hohen Frequenz zählen. Method according to Claim 1, characterized in that the change in the temporal position of the control pulses is effected by changing the initial state of counters which, for the generation of the control pulses for the horizontal grid lines (SH), have a certain number of lines and for the generation of the control pulses for the vertical grid lines (SV) count a certain number of pulses of a pulse train with a high frequency compared to the line frequency.
PCT/EP1990/002101 1989-12-12 1990-12-05 Process for adjusting the position of the deflection raster in a television set WO1991009491A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3940996A DE3940996A1 (en) 1989-12-12 1989-12-12 METHOD FOR ADJUSTING THE POSITION OF THE DEFLECTOR IN A TELEVISION RECEIVER
DEP3940996.1 1989-12-12

Publications (1)

Publication Number Publication Date
WO1991009491A1 true WO1991009491A1 (en) 1991-06-27

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Application Number Title Priority Date Filing Date
PCT/EP1990/002101 WO1991009491A1 (en) 1989-12-12 1990-12-05 Process for adjusting the position of the deflection raster in a television set

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EP (1) EP0504176A1 (en)
JP (1) JPH05503163A (en)
CN (1) CN1019253B (en)
AU (1) AU6884291A (en)
DE (1) DE3940996A1 (en)
MY (1) MY104563A (en)
TR (1) TR24999A (en)
WO (1) WO1991009491A1 (en)

Citations (2)

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Publication number Priority date Publication date Assignee Title
US4300076A (en) * 1980-02-22 1981-11-10 Zenith Radio Corporation Raster-centering circuit for multiple raster CRT systems
US4495519A (en) * 1982-06-30 1985-01-22 Tektronix, Inc. Test pattern generators

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JPS6181865A (en) * 1984-08-16 1986-04-25 Honda Motor Co Ltd Electromagnetic type power boosting device
JPS62175263A (en) * 1986-01-30 1987-07-31 Hitachi Ltd Motor-driven power steering control device
JPH0643187B2 (en) * 1986-04-22 1994-06-08 株式会社日立製作所 Electric power steering device
JP2526583B2 (en) * 1987-05-29 1996-08-21 トヨタ自動車株式会社 Electric power steering device

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Publication number Priority date Publication date Assignee Title
US4300076A (en) * 1980-02-22 1981-11-10 Zenith Radio Corporation Raster-centering circuit for multiple raster CRT systems
US4495519A (en) * 1982-06-30 1985-01-22 Tektronix, Inc. Test pattern generators

Non-Patent Citations (2)

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Title
Patent Abstracts of Japan, Band 5, Nr. 23 (E-45)(695), 12. Februar 1981; & JP-A-55150668 (CLARION K.K.) 22. November 1980 *
Patent Abstracts of Japan, Band 7, Nr. 190 (E-194)(1335), 19. August 1983; & JP-A-5892170 (MATSUSHITA DENKI SANGYO K.K.) 1. Juni 1983 *

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Publication number Publication date
TR24999A (en) 1992-09-01
DE3940996A1 (en) 1991-06-13
EP0504176A1 (en) 1992-09-23
CN1019253B (en) 1992-11-25
AU6884291A (en) 1991-07-18
CN1054161A (en) 1991-08-28
MY104563A (en) 1994-04-30
JPH05503163A (en) 1993-05-27

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