WO1986003046A1 - Device for eliminating the interline flicker - Google Patents

Device for eliminating the interline flicker Download PDF

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Publication number
WO1986003046A1
WO1986003046A1 PCT/EP1985/000624 EP8500624W WO8603046A1 WO 1986003046 A1 WO1986003046 A1 WO 1986003046A1 EP 8500624 W EP8500624 W EP 8500624W WO 8603046 A1 WO8603046 A1 WO 8603046A1
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Prior art keywords
additional
amplifier
winding
additional deflection
coincidence
Prior art date
Application number
PCT/EP1985/000624
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German (de)
French (fr)
Inventor
Günter Gleim
Uwe Hartmann
Udo Mai
Fritz Ohnemus
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
Priority to DE8585905814T priority Critical patent/DE3578909D1/en
Priority to AT85905814T priority patent/ATE55024T1/en
Publication of WO1986003046A1 publication Critical patent/WO1986003046A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/04—Deflection circuits ; Constructional details not otherwise provided for

Definitions

  • the invention relates to a device for eliminating the intermittent lenflimmer when displaying graphic characters on a picture display screen, for example a television screen, together with a television picture.
  • the television signal broadcast according to the television standard is reproduced according to the interlaced method.
  • the purpose of this is to increase the flicker frequency in such a way that it is practically imperceptible.
  • the interlaced method a television picture is generated in that two successively written fields with a number of k plus 1/2 lines each are reproduced, the fields being interleaved like a comb by alternately writing the even-numbered lines and the odd-numbered lines. This increases the frame rate for a full screen.
  • this interlacing method has a major disadvantage, because the so-called interlaced flicker appears in a stack especially when standing Images, especially graphic drawings, are to be reproduced. Intermediate line flickering is particularly pronounced in horizontal lines. It is therefore known to switch off the interlacing when playing such characters by writing two fields one above the other. As a result, the inter-line flicker characterized by the vertical unrest of the character shown is no longer visible (DE-AS 29 49 020).
  • the invention has for its object to eliminate the interline flicker for the display of faded-in graphical characters without deteriorating the quality of a television signal received at the same time. This object is achieved by the invention specified in the patent claim. Further embodiments of the invention result from the subclaims.
  • the invention has the advantage that the interlacing for the television signal and thus the quality of the entire image is now retained even in the horizontal direction during the simultaneous reproduction of a television signal and a graphic character.
  • Figure 1 shows the circuit arrangement of the invention
  • Figure 2 shows the arrangement of the invention in a television receiver.
  • the Btx decoder supplies, for example, a fade-out signal that serves to blank out the underlying television signal during the character insertion in order to increase the contrast of the character.
  • This fade-out signal is ANDed in conjunction with the half-image detection signal.
  • the fade-out signal FB (fast-blanking) is based on an NFN Put transistor 1, the collector of which is connected via a load resistor 2 to the operating voltage source UB.
  • the emitter of transistor 1 is connected to ground via a resistor 3.
  • the field detection signal HK is applied to the emitter via a series resistor 4, which only switches the transistor 1 conductive for the duration of one field.
  • the base of a further PNP transistor 5 is connected to the collector of the transistor 1, the emitter of which is connected to the operating voltage source UB via the resistor 6 and an additional deflection coil pair is connected in the collector circuit which is arranged in the vicinity of the vertical main deflection winding on the picture tube neck such that the current flowing through this causes the additional vertical shift of the electron beam.
  • the described additional deflection generator switches off the interlacing only for the duration of the displayed character. He must therefore be able to switch the video frequency on and off.
  • the switchover time is of the order of 200 ms.
  • the main deflection coil is therefore unsuitable for switching off the interlacing because of its large inductance and the winding capacity.
  • the existing deflection amplifier is also not able to generate the required rapid changes in the current.
  • a deflection generator with a limit frequency of 4.5 MHz is therefore required.
  • the required deflection power can be applied.
  • the time constant L / R must be small because of the high switching speed. It is very cost-effective to use a scule printed on a foil, which is placed around the tube shark. It is essential that the transistors of the deflection generator are not saturated range are controlled so that the switching process is not delayed due to stored charge carriers. The operating point of the transistors of the additional deflection generator is selected accordingly. Because of the low deflection power, small transistors are sufficient.
  • the deflection generator is expediently arranged on the mounting plate 8 of the television picture tube 9, as shown in FIG. It is essential that the feed line 10 to the additional deflection coil 7 is very short in order to keep the feed inductance small. From the pair of steering coils is located on the tube neck of the picture tube 9 below the steering unit 12, which is partially cut open for the detection of the deflection coil 7. A plug connection 11 connects the circuit of the deflection generator with the signal voltage and operating voltage sources located on the device chassis.

Abstract

A device enables to reproduce without flicker mixed signals from VT and/or BTX decoders during the reproduction of television signals (mixed operation). This is obtained by a video frequency scanning field compensation in the vertical direction effected by a video frequency additional connectable scanning amplifier which supplies a reduced inductivity additional scanning winding.

Description

Figure imgf000003_0002
Figure imgf000003_0002
Einrichtung zur Beseitigung des Zwischenzeilenflimmerns.
Figure imgf000003_0001
Device for eliminating interline flicker.
Figure imgf000003_0001
Die Erfindung geht aus von einer Einrichtung zur Beseitigung des Zwischenzei lenflimmerns bei der Darstellung von graphischen Zeichen auf einem Bildwiedergabeschirm, beispielsweise einer Fernsehbildrönre, zusammen mit einem Fernsehbild.The invention relates to a device for eliminating the intermittent lenflimmer when displaying graphic characters on a picture display screen, for example a television screen, together with a television picture.
Das nach der Fernsehnorm gesendete Fernsehsignal wird nech dem Zeilensprungverfahren wiedergegeben. Dies hat den Zweck, die Flimmerfrequenz derart zu erhöhen, daß sie praktisch nicht mehr wahrnehmbar ist. Beim Zeilensprungverfahren wird ein Fernsehbild dadurch erzeugt, daß zwei nacheinander geschriebene Halbbilder mit je einer Anzahl von k Plus 1/2 Zeilen wiedergegeben werden, wobei die Halbbilder kammartig verschachtelt sind, indem abwechselnd die geradzahligen Zeilen und die ungeradzah ligen Zeilen geschrieben werden. Dadurch wird für ein Vollbild die Bildwechselfrequenz erhöht. Nun hat dieses Zeilensprungverfahren einen großen Nachteil, weil das sogenannte Zwischenzeilenflimmern besonders dann stack in Erscheinung tritt, wenn stehende Bilder, insbesondere graphische Zeicheh, wiedergegeben werden sollen. Besonders stark tritt das Zwischenzsilenflimmern bei waagrechten Linien auf. Deshalb ist es bekannt, bei der Wiedergabe von derartigen Zeichen den Zeilensprung abzuschalten, indem zwei Halbbilder übereinander geschrieben werden. Dadurch ist das durch vertikale Unruhe des dargestellten Zeichens gekennzeichnete Zwischenzeilenflimmern nicht mehr sichtbar (DE-AS 29 49 020).The television signal broadcast according to the television standard is reproduced according to the interlaced method. The purpose of this is to increase the flicker frequency in such a way that it is practically imperceptible. In the interlaced method, a television picture is generated in that two successively written fields with a number of k plus 1/2 lines each are reproduced, the fields being interleaved like a comb by alternately writing the even-numbered lines and the odd-numbered lines. This increases the frame rate for a full screen. Now, this interlacing method has a major disadvantage, because the so-called interlaced flicker appears in a stack especially when standing Images, especially graphic drawings, are to be reproduced. Intermediate line flickering is particularly pronounced in horizontal lines. It is therefore known to switch off the interlacing when playing such characters by writing two fields one above the other. As a result, the inter-line flicker characterized by the vertical unrest of the character shown is no longer visible (DE-AS 29 49 020).
Es ist bekannt, gleichzeitig während der Wiedergabe der graphischen Zeichen auch ein gesendetes Fernsehbild als Hintergrund wiederzugeben. Bei genereller Abschaltung des Zeilensprunges nach der soeben beschriebenen Methode ergibt sich für das wiedergegebene Fernsehbild der Nachteil, daß die Auflösung gering ist, weil die Zeilen paarig stehen. Es ist jedoch erwünscht, daß bei diesem sogenannten Mixbetrieb auch das im Hintergrund wiedergegebene Fernsehbild in seiner Qualität nicht verschlechtert wird. Deshalb ist bekannt, den Zeilensprung nur dann abzuschalten, wenn während einiger Zeilen, z.B. am unteren Bildrand, eingeblendete graphische Zeichen wiedergegeben werden. Auf diese Weise ist der größte Teil des Fernsehbildes zwar gut, jedoch während der Dauer der Einblendung der Zeichen weniger gut aufgelöst. Dies ist in Der DE-PS 30 38 144 beschrieben. Die Abschaltung des Zeilensprungs erfolgt durch eine vertikale zusätzliche Ablenkung des Elektronenstrahls mit Hilfe der Vertikalhauptablenkwickiung.It is known to simultaneously display a transmitted television picture as background while the graphic characters are being reproduced. If the interlacing is generally switched off using the method just described, the disadvantage for the reproduced television picture is that the resolution is low because the lines are in pairs. However, it is desirable that the quality of the television picture reproduced in the background should not deteriorate in this so-called mixed mode. It is therefore known to switch off interlacing only if during a few lines, e.g. at the bottom of the screen, displayed graphic characters are shown. In this way, most of the television picture is good, but less well resolved during the duration of the fade-in of the characters. This is described in DE-PS 30 38 144. The interlacing is switched off by an additional vertical deflection of the electron beam with the help of the main vertical deflection winding.
Da hier jedoch der Zeilensprung während der Dauer der ganzen Zeile ausgeschaltet ist, ergeben sich nachteilig waagerechte Streifen, die als Störmustsr dem Fernsehbild überlagert sind. Der Erfindung liegt die Aufgabe zugrunde, das Zwischenzeilenflimmern für die Wiedergabe von eingeblendeten graphischen Zeichen zu beseitigen, ohne die Qualität eines gleichzeitig empfangenen Fernsehsignals zu verschlechtern. Diese Aufgabe wird durch die im Patentanspruch angegebene Erfindung gelöst. Weitere Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.However, since the interlacing is switched off for the duration of the entire line, horizontal stripes result disadvantageously, which are superimposed on the television picture as interference. The invention has for its object to eliminate the interline flicker for the display of faded-in graphical characters without deteriorating the quality of a television signal received at the same time. This object is achieved by the invention specified in the patent claim. Further embodiments of the invention result from the subclaims.
Die Erfindung besitzt den Vorteil, daß nun auch in horizontaler Richtung während der gleichzeitigen Wiedergabe eines Fernsehsignals und eines graphischen Zeichens der Zeilensprung für das Fernsehsignal und damit die Qualität des gesamten Bildes erhalten bleibt.The invention has the advantage that the interlacing for the television signal and thus the quality of the entire image is now retained even in the horizontal direction during the simultaneous reproduction of a television signal and a graphic character.
Nachstehend sei die Erfindung an einem Ausführungsbeispiel mit Hilfe der Zeichnung näher erläutert.The invention will be explained in more detail using an exemplary embodiment with the aid of the drawing.
Figur 1 zeigt die Schaltungsanordnung der Erfindung;Figure 1 shows the circuit arrangement of the invention;
Figur 2 zeigt die Anordnung der Erfindung in einem Fernsehempfänger.Figure 2 shows the arrangement of the invention in a television receiver.
Angenommen, es soll während der Wiedergabe eines Btxbzw. VT-Signals der Zeilensprung ausgeschaltet werden. Der Btx-Decoder liefert z.B. ein Ausblendsignal, das während der Zeicheneinb lendung zur Austastung des unterlegten Psrnsehsign als dient, um den Kontrast des Zeichens zu erhöhen. Dieses Ausblends ignal wird in Verbindung mit dem Halbcildkennungssignal UND- verknüpft. Das Ausblendsignal F B (fast-blanking) wird auf die Basis eines NFN Transistors 1 gelegt, dessen Kollektor über einen Arbeitswiderstand 2 mit der Betriebsspannungsquelle UB verbunden ist. Der Emitter des Transistors 1 ist über einen Widerstand 3 mit Masse verbunden. An den Emitter wird über einen Vorwiderstand 4 das Halbbildkennungssignal HK gelegt, welches den Transistor 1 nur für die Dauer eines Halbbildes leitfähig schaltet. An den Kollektor des Transistors 1 ist die Basis eines weiteren PNP-Transistors 5 geschaltet, dessen Emitter über den Widerstand 6 an der Betriebsspannungsquelle UB liegt und in dessen Kollektorkreis eine Zusatzablenkspulenpaar geschaltet ist, die so in der Nähe der Vertikalhauptablenkwicklung am Bildröhrenhals angeordnet ist, daß der durch diese fliessende Strom die zusätzliche Vertikalverschiebung des Elektrαnenstrahls hervorruft. Der beschriebene zusätzliche Ablenkgeneratαr schaltet den Zeilensprung nur während der Dauer des eingeblendeten Zeichens ab. Er muß deshalb in der Lage sein, videofrequent ein- und abzuschalten. Die Umschaltzeit liegt in der Größenordnung von 200 ms. Deshalb ist für die Ausschaltung des Zeilensprungs die Hauptablenkspule wegen ihrer großen Induktivität und der Wicklungskapazität ungeeignet. Auch ist der vorhandene Ablenkverstärker nicht fähig, die erforderlichen schnellen Stramänderungen zu erzeugen. Es ist deshalb ein Ablenkgenerater mit einer Grenzfrequenz 4,5 MHz erforderlich. In Verbindung mit einer kleinen zusätzlichen Hilfsab lenkspule geringer Induktivität kann die benötigte Ablenkleistung aufgebracht werden. Die Zeitkαnstante L/R muß wegen der hohen Schaltgeschwinaigkeit klein sein. Sehr kostengünstig ist die Verwendung einer auf eine Folie gedruckten Scule, die um den Röhrenhais gelegt wird. Wesentlich ist, daß die Transistoren des Ablenkg enerators nicht in den Sättigungs bereich ausgesteuert werden, damit der Umschaltvorgang infolge von gespeicherten Ladungsträgern nicht verzägert wird. Durch entsprechende Wahl der Arbeitspunkte der Transistoren des zusätzlichen Ablenkgenerators wird dieses erreicht. Wegen der geringen Ablenkleistung sind kleine Transistoren ausreichend. Zweckmäßigerweise wird der Ablenkgeneratαr auf der Fassungsplatte 8 der Fernsehbildröhre 9 angeαrdnet, wie in Figur 2 dargestellt. Wesentlich ist, daß die Zuleitung 10 zur zusätzlichen Ablenkspule 7 sehr kurz sind, um die Zuleitungsinduktivität klein zu halten. Das Ab lenkspulenpaar befindet sich am Röhrenhals der Bildröhre 9 unterhalb der Ab lenkeinheit 12, welche zwecks Erkennung der Ablenkspule 7 teilweise aufgeschnitten ist. Eine Steckverbindung 11 verbindet die Schaltung des Ablenkgenerators mit den auf dem Gerätechassis befindlichen Signalspannungs- und Betriebsspannungsquellen. Assume that you want to play a Btx or Interlaced VT signal can be switched off. The Btx decoder supplies, for example, a fade-out signal that serves to blank out the underlying television signal during the character insertion in order to increase the contrast of the character. This fade-out signal is ANDed in conjunction with the half-image detection signal. The fade-out signal FB (fast-blanking) is based on an NFN Put transistor 1, the collector of which is connected via a load resistor 2 to the operating voltage source UB. The emitter of transistor 1 is connected to ground via a resistor 3. The field detection signal HK is applied to the emitter via a series resistor 4, which only switches the transistor 1 conductive for the duration of one field. The base of a further PNP transistor 5 is connected to the collector of the transistor 1, the emitter of which is connected to the operating voltage source UB via the resistor 6 and an additional deflection coil pair is connected in the collector circuit which is arranged in the vicinity of the vertical main deflection winding on the picture tube neck such that the current flowing through this causes the additional vertical shift of the electron beam. The described additional deflection generator switches off the interlacing only for the duration of the displayed character. He must therefore be able to switch the video frequency on and off. The switchover time is of the order of 200 ms. The main deflection coil is therefore unsuitable for switching off the interlacing because of its large inductance and the winding capacity. The existing deflection amplifier is also not able to generate the required rapid changes in the current. A deflection generator with a limit frequency of 4.5 MHz is therefore required. In connection with a small additional auxiliary steering coil of low inductance, the required deflection power can be applied. The time constant L / R must be small because of the high switching speed. It is very cost-effective to use a scule printed on a foil, which is placed around the tube shark. It is essential that the transistors of the deflection generator are not saturated range are controlled so that the switching process is not delayed due to stored charge carriers. The operating point of the transistors of the additional deflection generator is selected accordingly. Because of the low deflection power, small transistors are sufficient. The deflection generator is expediently arranged on the mounting plate 8 of the television picture tube 9, as shown in FIG. It is essential that the feed line 10 to the additional deflection coil 7 is very short in order to keep the feed inductance small. From the pair of steering coils is located on the tube neck of the picture tube 9 below the steering unit 12, which is partially cut open for the detection of the deflection coil 7. A plug connection 11 connects the circuit of the deflection generator with the signal voltage and operating voltage sources located on the device chassis.

Claims

Patentansprüche Claims
1. Einrichtung zur Beseitigung des Zwischenzeilenflimmerns bei der Darstellung von graphischen Zeichen auf einem Bild wiedergabeschirm, beispielsweise einer Fernsehbilcröhre, zusammen mit einem Fernsehbild, d a d u r c h g e k e n n z e i c h n e t, daß ein zusätzlicher Ablenkverstärker vorgesehen ist, welcher für die Dauer des graphischen Zeichens eine Zusatzablenkwicklung (7) speist, die während der Dauer der Zeichenwiedergabe den Elektronenstrahl im Wesentlichen um eine Zeilenbreite verschiebt.1. Device for eliminating the interline flicker when displaying graphic characters on a picture display screen, for example a television picture tube, together with a television picture, characterized in that an additional deflection amplifier is provided which feeds an additional deflection winding (7) for the duration of the graphic character, which essentially shifts the electron beam by one line width during the duration of the character reproduction.
2. Einrichtung nach Anspruch 1, d a d u r c h g e k e n nz e i c h n e t, daß der Arbeitspunkt des zusätzlichen Ablenkverstärkers derart eingestellt ist, daß die verwendeten Transistoren nicht bis zur Sättigung durchgesteuert werden.2. Device according to claim 1, so that the operating point of the additional deflection amplifier is set in such a way that the transistors used are not turned on until saturation.
3. Einrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß der zusätzliche Ablenkverstärker zur Verringerung der Zuleitungsinduktivität raumlieh sehr nahe an der Zusatzablenkwicklung (7) angeortnet ist.3. Device according to claim 1, so that the additional deflection amplifier for reducing the supply inductance is spatially arranged very close to the additional deflection winding (7).
4. Einrichtung nach Anspruch 1, d a d u r c h g e k s n nz e i c h n e t, daß der zusätzllche Ablεnkverstärker auf der Bildröhrenfassungsplatte (8) angeordnet ist. 4. Device according to claim 1, dadurchgeksn nz eichnet that the additional Ablεnk amplifier on the picture tube mounting plate (8) is arranged.
5. Einrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß die Zusatzablenkwicklung (7) aus einer um den Bildröhrenhals gelegten Folienspule bestsht.5. Device according to claim 1, so that the additional deflection winding (7) consists of a film spool placed around the picture tube neck.
6. Einrichtung nach einem der Ansprüche 1 bis 5, d ad u r c h g e k e n n z e i c h n e t, daß eine Koinzidenzschaltung vorgesehen ist, die aus der Koinzidenz eines zusammen mit dem Signal der graphischen Zeichen übertragenen Ausblendimpulses (fast-blanking) und eines Halbbildkennungssignals die Steuergröße für die Zusatzwicklung (7) erzeugt.6. Device according to one of claims 1 to 5, characterized by the fact that a coincidence circuit is provided which, from the coincidence of a masking pulse transmitted together with the signal of the graphic characters (fast-blanking) and a field detection signal, is the control variable for the additional winding (7 ) generated.
7. Einrichtung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t, daß die Steuergröße für die Zusatzwicklung (7) von einem zlenkverstärker geliefert wird, der bei der Koinzidenz freigegeben bzw. aktiviert wird. 7. Device according to claim 6, d a d u r c h g e k e n n z e i c h n e t that the control variable for the additional winding (7) is supplied by a zlenk amplifier, which is released or activated at the coincidence.
PCT/EP1985/000624 1984-11-16 1985-11-16 Device for eliminating the interline flicker WO1986003046A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8585905814T DE3578909D1 (en) 1984-11-16 1985-11-16 DEVICE FOR ELIMINATING INTERMEDIATE FLICKERS.
AT85905814T ATE55024T1 (en) 1984-11-16 1985-11-16 DEVICE TO ELIMINATE INTERLINE Flicker.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3441905.5 1984-11-16
DE19843441905 DE3441905A1 (en) 1984-11-16 1984-11-16 DEVICE FOR ELIMINATING INTERMEDIATE FLICKERS

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WO1986003046A1 true WO1986003046A1 (en) 1986-05-22

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JP (1) JPS62501464A (en)
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WO (1) WO1986003046A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK159354C (en) * 1987-08-26 1991-03-11 Bang & Olufsen As TELEVISION RECEIVER WITH REPRESENTATIVES

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962604A (en) * 1973-06-13 1976-06-08 Compagnie Industrielle Des Telecommunications Cit-Alcatel Deflection system for a cathode ray tube
GB2062401A (en) * 1979-10-15 1981-05-20 Philips Nv Picture display device for displaying a mixed picture signal
EP0053207A1 (en) * 1980-11-28 1982-06-09 International Business Machines Corporation Raster CRT flicker reducing apparatus
US4415889A (en) * 1980-12-18 1983-11-15 Rca Corporation Raster-scanned CRT display system with improved positional resolution for digitally encoded graphics

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA806148B (en) * 1979-10-15 1982-05-26 Philips Nv Picture display device arranged for displaying a mixed picture signal as an interlaced television picture
JPS5854394A (en) * 1981-09-28 1983-03-31 ソニー株式会社 Envelope signal control circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962604A (en) * 1973-06-13 1976-06-08 Compagnie Industrielle Des Telecommunications Cit-Alcatel Deflection system for a cathode ray tube
GB2062401A (en) * 1979-10-15 1981-05-20 Philips Nv Picture display device for displaying a mixed picture signal
EP0053207A1 (en) * 1980-11-28 1982-06-09 International Business Machines Corporation Raster CRT flicker reducing apparatus
US4415889A (en) * 1980-12-18 1983-11-15 Rca Corporation Raster-scanned CRT display system with improved positional resolution for digitally encoded graphics

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DE3578909D1 (en) 1990-08-30
DE3441905A1 (en) 1986-05-28
EP0203125B1 (en) 1990-07-25
JPS62501464A (en) 1987-06-11
EP0203125A1 (en) 1986-12-03

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