EP0553386A1 - CRT device with wait function - Google Patents

CRT device with wait function Download PDF

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Publication number
EP0553386A1
EP0553386A1 EP92101644A EP92101644A EP0553386A1 EP 0553386 A1 EP0553386 A1 EP 0553386A1 EP 92101644 A EP92101644 A EP 92101644A EP 92101644 A EP92101644 A EP 92101644A EP 0553386 A1 EP0553386 A1 EP 0553386A1
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EP
European Patent Office
Prior art keywords
video signal
picture tube
original
tube
white image
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
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EP92101644A
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German (de)
French (fr)
Other versions
EP0553386B1 (en
Inventor
Erwin Dipl.-Ing. Bässler (FH)
Josef Meinerzhagen
Wolfgang Dr. Phil. Racek
Edmund Dipl.-Ing. Pötsch (FH)
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Wincor Nixdorf International GmbH
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Wincor Nixdorf International GmbH
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Publication date
Application filed by Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Priority to ES92101644T priority Critical patent/ES2092584T3/en
Priority to AT92101644T priority patent/ATE144642T1/en
Priority to DE59207432T priority patent/DE59207432D1/en
Priority to EP92101644A priority patent/EP0553386B1/en
Publication of EP0553386A1 publication Critical patent/EP0553386A1/en
Priority to US08/240,503 priority patent/US5493336A/en
Application granted granted Critical
Publication of EP0553386B1 publication Critical patent/EP0553386B1/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
    • G09G1/06—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 using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
    • G09G1/14—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 using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible
    • G09G1/16—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 using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time

Definitions

  • the invention relates to a tube screen device with a standby function according to the features of the preamble of claim 1.
  • Tube screen devices e.g. Data display devices are often used during a whole working day or e.g. in a data center, still on all night, although the actual usage time is only a fraction of the on time.
  • the total useful life of a CRT is essentially limited by the life of the CRT.
  • the life of the picture tube is determined by the effectiveness of the heated cathode. The effectiveness of the heated cathode decreases over time. For quality products, the life of a picture tube is approximately 10,000 hours. Then the brightness of the picture tube decreased to 70% of the original value due to the decrease in effectiveness of the cathode.
  • the tube monitor is put in a waiting position or in a so-called "stand-by mode".
  • the monitor part is switched off for this purpose, and with it all voltages on the picture tube.
  • the disadvantage here is that a heating phase is run through each time the device is restarted.
  • the monitor part is switched off in the main, but not the heating of the picture tube.
  • the monitor part is switched off in the main, but not the heating of the picture tube.
  • a third possibility of putting the CRT display device on hold is to switch off only the video signal and thus darken the CRT. This further heats the picture tube. But the grid voltages are still present on the picture tube.
  • the object of the invention is therefore to improve a CRT display device with a waiting position function so that the CRT is better protected when changing between an operating and waiting position, so that its service life is increased.
  • the figure shows, as far as necessary for the explanation of the invention, in a basic representation a section of the components contained in a tube screen device.
  • a video signal amplifier VVS a picture tube BR
  • a resistance circuit WS and two switches S1 and S2 which can be switched simultaneously via a common control line SWF are shown. Since the mode of operation of a CRT device is known per se, it will not be dealt with in more detail here.
  • the picture tube BR has a heater HZ for heating the picture tube cathode BK. Furthermore, it has a plurality of grids G1 to G3, which are connected to corresponding grid voltages.
  • the anode of the picture tube BR is connected to a 15 kV voltage.
  • the heater HZ of the picture tube BR is supplied with a 12 volt voltage.
  • the switch S1 is a changeover switch that switches between an original video signal VS, which is decisive in the operating position of the CRT device, and another video signal WP, which is decisive in its waiting position.
  • the original video signal VS generates a beam current with an original white image level in the picture tube BR, the level of which corresponds to a nominal value.
  • the other video signal WP generates a beam current in the picture tube BR with a white image level that is at least a small percentage compared to the original white image level of the original video signal VS.
  • the switch S1 either switches the original video signal VS or the other video signal WP switched through.
  • the switched-through video signal is forwarded to the video signal amplifier VVS and from there to the cathode ray tube BK.
  • the second switch S2 can be regarded as a break contact. It is connected to the heater HZ of the picture tube BR in such a way that in the closed state it applies the heater HZ to the full heating voltage, that is to say to the full 12 volt voltage.
  • the resistance circuit WS is connected in parallel to the switch S2. In the closed state of the switch S2, the resistance circuit WS is bridged and thus has no function. In the open state of the switch S2, however, it is in series with the heater HZ of the picture tube BR and, depending on its dimensions, at least slightly reduces the heating current.
  • the switch S2 is switched in such a way that it is closed in the operating position of the tube monitor and opened in the waiting position.
  • the position of the CRT device depends on the control signal SWF mentioned above, which is common to the two switches S1 and S2. This is generated by a higher-level control unit, not shown in the figure, which recognizes whether the CRT monitor has not been used for a long time and therefore switches it to the waiting position, or whether it is being used again and therefore switches it to the operating position.

Abstract

To protect and thus increase the operating life of the picture tube (BR) of a CRT device with wait function, the heating current of the picture tube (BR) is reduced in the wait setting of the CRT device by at least a small percentage compared with an original heating current and the picture tube (BR) is supplied with a video signal (WP) which differs from an original video signal (VS) and which generates a beam current in the picture tube (BR) with a white picture level which is at least low in percentage terms compared with an original white picture level of the original video signal (VS). <IMAGE>

Description

Die Erfindung betrifft ein Röhrenbildschirmgerät mit Wartestellungsfunktion gemäß den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a tube screen device with a standby function according to the features of the preamble of claim 1.

Röhrenbildschirmgeräte, wie z.B. Datensichtgeräte, sind oft während eines ganzen Arbeitstages oder, z.B. in einem Rechenzentrum, auch noch während der ganzen Nacht eingeschaltet, obwohl die tatsächliche Benutzungszeit nur einen Bruchteil der eingeschalteten Zeit ausmacht. Die gesamte nutzbare Betriebsdauer eines Röhrenbildschirmgerätes ist im wesentlichen durch die Lebensdauer der Bildröhre begrenzt. Die Lebensdauer der Bildröhre wird dabei durch die Effektivität der geheizten Kathode bestimmt. Die Effektivität der geheizten Kathode nimmt im Laufe der Zeit ab. Bei Qualitätsprodukten beträgt die Lebensdauer einer Bildröhre ungefähr 10.000 Stunden. Dann ist die Helligkeit der Bildröhre wegen der Effektivitätsabnahme der Kathode auf 70 % des ursprünglichen Wertes abgesunken.Tube screen devices, e.g. Data display devices are often used during a whole working day or e.g. in a data center, still on all night, although the actual usage time is only a fraction of the on time. The total useful life of a CRT is essentially limited by the life of the CRT. The life of the picture tube is determined by the effectiveness of the heated cathode. The effectiveness of the heated cathode decreases over time. For quality products, the life of a picture tube is approximately 10,000 hours. Then the brightness of the picture tube decreased to 70% of the original value due to the decrease in effectiveness of the cathode.

Um die Bildröhre zu schonen, sind mehrere Möglichkeiten bekannt geworden. Dabei wird das Röhrenbildschirmgerät jeweils in eine Wartestellung bzw. in einen sogenannten "stand-by-mode" gebracht.Several options have become known for protecting the picture tube. The tube monitor is put in a waiting position or in a so-called "stand-by mode".

Bei einer ersten Möglichkeit wird hierzu der Monitorteil abgeschaltet und damit auch alle Spannungen an der Bildröhre. Der Nachteil hierbei ist, daß bei jeder Wiederinbetriebnahme des Gerätes eine Aufheizphase durchlaufen wird.In a first possibility, the monitor part is switched off for this purpose, and with it all voltages on the picture tube. The disadvantage here is that a heating phase is run through each time the device is restarted.

Bei einer zweiten Möglichkeit wird zwar das Monitorteil in der Hauptsache abgeschaltet, nicht aber die Heizung der Bildröhre. Auf diese Weise kann beispielsweise nach einer Tastatureingabe bei einem Datensichtgerät sehr schnell wieder ein Bild, ein sogenanntes Sofortbild, erhalten werden.In a second possibility, the monitor part is switched off in the main, but not the heating of the picture tube. In this way, for example, after entering a keyboard an image, a so-called instant image, can be obtained very quickly with a data display device.

Eine dritte Möglichkeit, das Röhrenbildschirmgerät in eine Wartestellung zu bringen, ist, nur das Videosignal abzuschalten und damit die Bildröhre dunkel zu steuern. Die Bildröhre wird dadurch weiter geheizt. Aber auch die Gitterspannungen liegen an der Bildröhre noch an.A third possibility of putting the CRT display device on hold is to switch off only the video signal and thus darken the CRT. This further heats the picture tube. But the grid voltages are still present on the picture tube.

Alle diese Möglichkeiten stellen keine günstigen Betriebsbedingungen im Sinne einer Schonung und damit Betriebsverlängerung der Bildröhre dar.All of these possibilities do not represent favorable operating conditions in the sense of protection and thus extension of the picture tube operation.

Eine durchgehende Heizung der Bildröhre ohne anliegende Gitterspannungen oder ohne Strahlstrom kann zu einer sogenannten "Kathodenvergiftung", d.h. zu einer chemischen Veränderung der Kathodensubstanz durch Fremdatome, und damit zur Reduzierung der erzielbaren Bildhelligkeit führen. Auch wird bei häufigem Ein- und Ausschalten der Bildröhrenheizung durch die damit verbundenen hohen Einschaltströme und thermischen Belastungszyklen die Bildröhrenkathode stark belastet.Continuous heating of the picture tube without applied grid voltages or without beam current can lead to so-called "cathode poisoning", i.e. lead to a chemical change in the cathode substance due to foreign atoms, and thus to a reduction in the achievable image brightness. Even if the picture tube heater is switched on and off frequently, the picture tube cathode is heavily stressed by the associated high inrush currents and thermal stress cycles.

Aufgabe der Erfindung ist es deshalb, ein Röhrenbildschirmgerät mit Wartestellungsfunktion so zu verbessern, daß die Bildröhre bei den Wechseln zwischen einer Betriebs- und Wartestellung besser geschont ist, so daß ihre Lebensdauer erhöht wird.The object of the invention is therefore to improve a CRT display device with a waiting position function so that the CRT is better protected when changing between an operating and waiting position, so that its service life is increased.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale gelöst. Durch diese Maßnahmen ist die Gefahr einer "Kathodenvergiftung" bei der Bildröhre durch chemische Veränderung der Kathodensubstanz reduziert, weil die Heizleistung reduziert und außerdem noch ein Videosignal vorhanden ist, das die Bildröhre noch etwas hellsteuert. Die Effektivität der Bildröhrenkathode bleibt erhalten. Dadurch wird die ereichbare Helligkeit der Bildröhre über einen längeren Zeitraum gewährleistet. Die Sofortbildfunktion ist außerdem gewährleistet.This object is achieved by the features specified in the characterizing part of claim 1. These measures reduce the risk of "cathode poisoning" in the picture tube due to chemical changes in the cathode substance, because the heating power is reduced and, moreover, a video signal is also present which controls the picture tube somewhat more brightly. The effectiveness of the cathode ray cathode is retained. This ensures the achievable brightness of the picture tube over a longer period of time. The instant picture function is also guaranteed.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand von Unteransprüchen. Danach wird ein optimaler Schonungseffekt und somit eine maximale Lebensdauer der Bildröhre erzielt.Advantageous embodiments of the invention are the subject of dependent claims. Then an optimal protection effect and thus a maximum lifespan of the picture tube is achieved.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to a drawing.

Die Figur zeigt, soweit für die Erläuterung der Erfindung notwendig, in Prinzipdarstellung einen Ausschnitt der in einem Röhrenbildschirmgerät enthaltenen Bauteile. Im einzelnen sind ein Videosignalverstärker VVS, eine Bildröhre BR, eine Widerstandsschaltung WS und zwei über eine gemeinsame Steuerleitung SWF gleichzeitig schaltbare Schalter S1 und S2 gezeigt. Da die Funktionsweise eines Röhrenbildschirmgerätes an sich bekannt ist, wird an dieser Stelle nicht näher darauf eingegangen.The figure shows, as far as necessary for the explanation of the invention, in a basic representation a section of the components contained in a tube screen device. In detail, a video signal amplifier VVS, a picture tube BR, a resistance circuit WS and two switches S1 and S2 which can be switched simultaneously via a common control line SWF are shown. Since the mode of operation of a CRT device is known per se, it will not be dealt with in more detail here.

Gemäß der Figur weist die Bildröhre BR eine Heizung HZ zum Beheizen der Bildröhrenkathode BK auf. Des weiteren weist sie mehrere Gitter G1 bis G3 auf, die an entsprechende Gitterspannungen angeschlossen sind. Die Anode der Bildröhre BR ist an eine 15 kV-Spannung angeschlossen. Die Heizung HZ der Bildröhre BR wird mit einer 12 Volt-Spannung versorgt.According to the figure, the picture tube BR has a heater HZ for heating the picture tube cathode BK. Furthermore, it has a plurality of grids G1 to G3, which are connected to corresponding grid voltages. The anode of the picture tube BR is connected to a 15 kV voltage. The heater HZ of the picture tube BR is supplied with a 12 volt voltage.

Der Schalter S1 ist ein Umschalter, der zwischen einem ursprünglichen Videosignal VS, das in der Betriebsstellung des Röhrenbildschirmgeräts maßgebend ist, und einem anderen Videosignal WP, das in deren Wartestellung maßgebend ist, umschaltet. Das ursprüngliche Videosignal VS erzeugt in der Bildröhre BR einen Strahlstrom mit einem ursprünglichen Weißbildpegel, dessen Höhe einem Nennwert entspricht. Das andere Videosignal WP erzeugt in der Bildröhre BR einen Strahlstrom mit einem gegenüber dem ursprünglichen Weißbildpegel des ursprünglichen Videosignals VS prozentual wenigstens geringen Weißbildpegel.The switch S1 is a changeover switch that switches between an original video signal VS, which is decisive in the operating position of the CRT device, and another video signal WP, which is decisive in its waiting position. The original video signal VS generates a beam current with an original white image level in the picture tube BR, the level of which corresponds to a nominal value. The other video signal WP generates a beam current in the picture tube BR with a white image level that is at least a small percentage compared to the original white image level of the original video signal VS.

Je nachdem, ob sich das Röhrenbildschirmgerät in der Betriebsstellung oder in der Wartestellung befindet, wird durch den Schalter S1 entweder das ursprüngliche Videosignal VS oder das andere Videosignal WP durchgeschaltet. Das durchgeschaltete Videosignal wird an den Videosignalverstärker VVS weitergeleitet und von dort aus an die Bildröhrenkathode BK geleitet.Depending on whether the CRT display device is in the operating position or in the waiting position, the switch S1 either switches the original video signal VS or the other video signal WP switched through. The switched-through video signal is forwarded to the video signal amplifier VVS and from there to the cathode ray tube BK.

Der zweite Schalter S2 kann als Öffner angesehen werden. Er ist an die Heizung HZ der Bildröhre BR in der Weise angeschlossen, daß er im geschlossenen Zustand die Heizung HZ an die volle Heizspannung, also an die volle 12 Volt-Spannung anlegt.The second switch S2 can be regarded as a break contact. It is connected to the heater HZ of the picture tube BR in such a way that in the closed state it applies the heater HZ to the full heating voltage, that is to say to the full 12 volt voltage.

Die Widerstandsschaltung WS ist parallel zum Schalter S2 geschaltet. In geschlossenem Zustand des Schalters S2 ist damit die Widerstandsschaltung WS überbrückt und damit funktionslos. Im geöffneten Zustand des Schalters S2 liegt sie dagegen in Serie zur Heizung HZ der Bildröhre BR und reduziert abhängig von ihrer Dimensionierung wenigstens geringfügig den Heizstrom.The resistance circuit WS is connected in parallel to the switch S2. In the closed state of the switch S2, the resistance circuit WS is bridged and thus has no function. In the open state of the switch S2, however, it is in series with the heater HZ of the picture tube BR and, depending on its dimensions, at least slightly reduces the heating current.

Der Schalter S2 wird in der Weise geschaltet, daß er in Betriebsstellung des Röhrenbildschirmgerätes geschlossen und in Wartestellung geöffnet ist.The switch S2 is switched in such a way that it is closed in the operating position of the tube monitor and opened in the waiting position.

In welcher Stellung sich das Röhrenbildschirmgerät gerade befindet, hängt von dem bereits erwähnten, den beiden Schaltern S1 und S2 gemeinsamen Steuersignal SWF ab. Dieses wird von einer in der Figur nicht näher dargestellten übergeordneten Steuereinheit erzeugt, das erkennt, ob das Röhrenbildschirmgerät längere Zeit schon nicht mehr benutzt wurde und dieses deshalb in die Wartestellung schaltet, oder ob es gerade wieder benutzt wird und dieses deshalb in die Betriebsstellung schaltet.The position of the CRT device depends on the control signal SWF mentioned above, which is common to the two switches S1 and S2. This is generated by a higher-level control unit, not shown in the figure, which recognizes whether the CRT monitor has not been used for a long time and therefore switches it to the waiting position, or whether it is being used again and therefore switches it to the operating position.

Zur Wahl des anderen Videosignals WP und der Widerstandsschaltung WS ist zu sagen, daß beispielsweise ein derartiges anderes Videosignal WP verwendet werden kann, das in der Bildröhre BR einen Strahlstrom mit einem Weißbildpegel von ca. 10 % des von dem ursprünglichen Videosignal VS hervorgerufenen ursprünglichen Weißbildpegels erzeugt, und daß eine Widerstandsschaltung WS verwendet werden kann, die den Heizstrom der Bildröhre um ca. 25 % reduziert.Regarding the choice of the other video signal WP and the resistance circuit WS, it can be said that, for example, such a different video signal WP can be used which produces a beam current in the picture tube BR with a white image level of approximately 10% of that caused by the original video signal VS. original white image level, and that a resistor circuit WS can be used, which reduces the heating current of the picture tube by about 25%.

Werden ein solches anderes Videosignal WP und eine solche Widerstandsschaltung WS gleichzeitig verwendet, ergeben sich daraus bezüglich Schonung und Lebensdauer besonders vorteilhafte Effekte für die Bildröhre BR.If such a different video signal WP and such a resistance circuit WS are used at the same time, this results in particularly advantageous effects for the picture tube BR with respect to protection and service life.

Claims (3)

Röhrenbildschirmgerät mit Wartestellungsfunktion, das eine Heizung (HZ) aufweisende Bildröhre (BR) enthält, die in Betriebssstellung des Röhrenbildschirmgerätes einerseits an eine Leitung mit einem ursprünglichen Videosignal (VS), das in der Bildröhre (BR) einen Strahlstrom mit einem ursprünglichen Weißbildpegel erzeugt, und andererseits an eine einen ursprünglichen Heizstrom erzeugende Heizspannung angeschlossen ist, dadurch gekennzeichnet, daß in Wartestellung des Röhrenbildschirmgerätes der Heizstrom der Bildröhre (BR) gegenüber dem ursprünglichen Heizstrom prozentual wenigstens geringfügig herabgesetzt und das ursprüngliche Videosignal (VS) durch ein anderes Videosignal (WP), das in der Bildröhre (BR) einen Strahlstrom mit einem gegenüber dem ursprünglichen Weißbildpegel des ursprünglichen Videosignals (VS) prozentual wenigstens geringen Weißpegel erzeugt, ersetzt ist.Tubular display device with standby function, which contains a heater (HZ) having a picture tube (BR) which, in the operating position of the tube display device, on the one hand connects to a line with an original video signal (VS) which generates a beam current in the picture tube (BR) with an original white image level, and on the other hand, is connected to a heating voltage generating an original heating current, characterized in that when the CRT display device is in the waiting position, the heating current of the picture tube (BR) is at least slightly reduced in percentage terms compared to the original heating current and the original video signal (VS) by another video signal (WP), the in the picture tube (BR), a beam current with a white level which is at least low in percentage compared to the original white image level of the original video signal (VS) is replaced. Röhrenbildschirmgerät nach Anspruch 1, dadurch gekennzeichnet, daß der Heizstrom um ca. 25 % herabgesetzt ist.Tube monitor according to claim 1, characterized in that the heating current is reduced by approximately 25%. Röhrenbildschirmgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das ursprüngliche Videosignal (VS) durch ein anderes Videosignal (WP) ersetzt ist, das in der Bildröhre (BR) einen Strahlstrom mit einem Weißbildpegel von ca. 10 % des ursprünglichen Weißbildpegels erzeugt.Tube monitor according to Claim 1 or 2, characterized in that the original video signal (VS) is replaced by another video signal (WP) which generates a beam current in the picture tube (BR) with a white image level of approximately 10% of the original white image level.
EP92101644A 1992-01-31 1992-01-31 CRT device with wait function Expired - Lifetime EP0553386B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES92101644T ES2092584T3 (en) 1992-01-31 1992-01-31 DISPLAY DEVICE WITH PICTURE TUBE WITH WAITING POSITION FUNCTION.
AT92101644T ATE144642T1 (en) 1992-01-31 1992-01-31 CRT DISPLAY WITH WAIT FUNCTION
DE59207432T DE59207432D1 (en) 1992-01-31 1992-01-31 Tube monitor with waiting function
EP92101644A EP0553386B1 (en) 1992-01-31 1992-01-31 CRT device with wait function
US08/240,503 US5493336A (en) 1992-01-31 1994-05-10 Picture tube screen device having waiting state function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92101644A EP0553386B1 (en) 1992-01-31 1992-01-31 CRT device with wait function

Publications (2)

Publication Number Publication Date
EP0553386A1 true EP0553386A1 (en) 1993-08-04
EP0553386B1 EP0553386B1 (en) 1996-10-23

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EP92101644A Expired - Lifetime EP0553386B1 (en) 1992-01-31 1992-01-31 CRT device with wait function

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US (1) US5493336A (en)
EP (1) EP0553386B1 (en)
AT (1) ATE144642T1 (en)
DE (1) DE59207432D1 (en)
ES (1) ES2092584T3 (en)

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DE19709681A1 (en) * 1997-03-11 1998-09-17 Thomson Brandt Gmbh Circuit for monitoring the beam current in a color tube
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US4149110A (en) * 1978-03-29 1979-04-10 Raytheon Company Brightness controlled CRT

Also Published As

Publication number Publication date
ATE144642T1 (en) 1996-11-15
EP0553386B1 (en) 1996-10-23
DE59207432D1 (en) 1996-11-28
ES2092584T3 (en) 1996-12-01
US5493336A (en) 1996-02-20

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