EP0930603B1 - Device for avoiding overheating the display driver components of a plasma display - Google Patents

Device for avoiding overheating the display driver components of a plasma display Download PDF

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Publication number
EP0930603B1
EP0930603B1 EP98124634A EP98124634A EP0930603B1 EP 0930603 B1 EP0930603 B1 EP 0930603B1 EP 98124634 A EP98124634 A EP 98124634A EP 98124634 A EP98124634 A EP 98124634A EP 0930603 B1 EP0930603 B1 EP 0930603B1
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Prior art keywords
display
image
signal
control signal
display driver
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EP98124634A
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German (de)
French (fr)
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EP0930603A3 (en
EP0930603A2 (en
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Matthias Grundig AG Köchel
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Grundig Multimedia BV
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Grundig AG
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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
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the invention relates to a device for avoiding overheating a display driver module of a plasma display, which display driver module has multiple display driver elements, which is a variety control lines of the plasma display and each of which one of several image areas of the one to be shown on the display Image is uniquely assigned with a measuring unit for generation a measurement signal which provides information about the power consumption of the display contains, one connected on the output side to the measuring unit Control signal generation unit for generating a control signal and a circuit that shows the brightness of those shown on the display Image signals reduced when the control signal from the control signal generating unit, which is connected on the output side to this circuit, is present.
  • the plasma display and the Display driver components of the plasma display temperature measuring devices assign the temperature of the plasma display and the display driver detect, with one of the temperature measuring devices connected downstream Control circuit when a predetermined value of the temperature signal is exceeded, generates a control signal via the display driver control circuit influences the potential or the number of pulses in the sustain period, such that the brightness decreases as the temperature rises.
  • An arrangement which has become known with JP09198005 uses the Avoid partial inadmissible heating of a plasma display transparent heat-conducting layer on the front and a heat-conducting Layer on the back of the display, the thermally conductive Layer on the back has a temperature sensor, so that over a Temperature monitoring circuit when the temperature increases Brightness-reducing control signal of the control circuit of the plasma display is fed.
  • the applicant's unpublished DE-A-197 20 876.2 a device for contrast adjustment in pulse-width-controlled image displays described.
  • picture displays there is between the input size and the luminance of the signal displayed on the screen a digital context.
  • the image is displayed using a time-division multiplexing method in which one frame period which is in one Plasma display is 20 ms, is broken down into several part-time intervals. During these part-time intervals, depending on what is desired Brightness value a predetermined number of digital voltage pulses Display control generated.
  • the display driver module provided for controlling the display has several display driver elements working in parallel. Each of these display driver elements is a predetermined number of image lines on the Assigned to plasma display. For example, a display driver module a total of 6 display driver elements, each of which 80 of the 480 lines are assigned to a full screen.
  • the object of the invention based on showing a way, as well as individual display driver elements of the display driver module can be protected against overheating.
  • Driver element can be ensured that all display driver elements Relieving reduction in the brightness of the on the display shown signals is already carried out, if only one single driver element due to special brightness distributions in the Image is overly stressed.
  • the device shown has an input E, via which the Device a video signal is supplied.
  • This video and / or Image signal is from the video signal path of an image source, such as TV receiver or PC derived, which with a plasma display 1 is provided on which images corresponding to the video signal are shown become.
  • an image source such as TV receiver or PC derived
  • plasma display 1 is provided on which images corresponding to the video signal are shown become.
  • Such plasma displays have a high power consumption Because of which measures are necessary, with the help of overheating of the display is avoided.
  • control signal ST1 and / or ST2 generated using the brightness of the on the display shown image signals is reduced.
  • the control signal generation unit evaluates to generate this control signal 2 signals from you from a temperature sensor 3 and from a total of six integrators 4a, ..., 4f are supplied.
  • the Temperature sensor 3 is arranged in the area of the display 1 and for Measurement of the temperature prevailing in the area of the display 1 intended.
  • the integrators 4a, ..., 4f are connected to the output of an Controllable amplifier 5 arranged in the video signal path via an A / D converter 6 and a digital signal processing circuit 7 connected.
  • the input of the controllable amplifier 5 is the at the input E Device applied signal supplied.
  • An output signal of the digital Signal processing circuit 7 is via a display driver module 8 fed to the plasma display.
  • the display driver module 8 has a total of six display driver elements on. Each of these six display driver elements is 80 lines of to be displayed full screen, which has a total of 480 lines having.
  • the display driver element 1 is lines 1-80, lines 81-160, the display driver element 2, the display driver element 3 lines 161-240, display driver element 4 lines 241-320, lines 321-400 and the display driver element 5 Display driver element 6 assigned to lines 401-480.
  • the digital signal processing circuit 7 includes, among others Image storage circuit and an interpolation circuit, by means of which the input signal delivered according to the PAL standard, which 625 Lines per frame, is converted into a 480-line signal, such as it is intended for display on the plasma display 1.
  • the control signal ST1 is fed to the control input of the amplifier 5.
  • the control signal ST2 is applied to the display driver module 8.
  • the temperature sensor 3 becomes Provided signal with predefined temperature threshold values compared, which are for example at 70 ° C, 80 ° C and 90 ° C by one temperature-dependent reduction in the brightness of the on-screen shown image.
  • each of these Integrators 4a, ..., 4f are assigned 80 lines of the video signal, so that Integrator 4a the video content transmitted in lines 1-80, the integrator 4b the video content transmitted in lines 81-160, the integrator 4c in lines 161-240 transmitted video content, the integrator 4d the in the Lines 241-320 transmitted video content, the integrator 4e that in the lines 321-400 transmitted video content and the integrator 4f the in the lines 401-480 transmitted video content is fed.
  • the video signal is evaluated in the With regard to the light and dark components contained therein.
  • the in the frame of these integration processes signal values are the Control signal generation unit 2 supplied and in this each with a predetermined threshold value compared. Such an evaluation results over a predetermined time interval that the one belonging to an integrator Output signal this predetermined threshold in more than 90% of the Exceeds cases, then this leads to an excessive burden on the each associated display driver element in the display driver module 8 conclude.
  • control signal generating unit 2 To overheat and destroy this display driver element prevent, the control signal generating unit 2 generates in this case a control signal ST1 and / or ST2, on the basis of which the gain of Amplifier 5 is reduced or the display driver module 8 is activated, to the brightness of the video signal shown on the display 1 to reduce. This means a reduction in the load on all six in the Display driver module 8 provided display driver elements.
  • This Control signal generation for reducing the brightness takes place when present an excessive load on one of the display driver elements then when the signals derived from the temperature sensor 3 are not yet on cause the entire display to overheat.
  • An excessive load on one of the display driver elements could result occur, for example, when on the plasma display 1 for one an image signal is displayed for a longer period of time, which in the upper 80th Lines of the picture contains very bright parts of the picture, while the total of 400 lines below have dark image content.
  • the Video signal processing circuit 7 provided digital signal into a signal suitable for driving the plasma display 1 converted.
  • the digital image signal is timed in divided several part-time intervals, during which depending on the each present brightness value corresponds to the brightness value Number of voltage pulses for display control is generated.
  • Such a procedure is, for example, the one already mentioned above DE-A- (Köchel) of the applicant and the status of the Technology described.
  • the above reduction in the brightness of the display The image signals shown happen in the display driver module 8 in that that the number of one in one or more part-time intervals Frame period of the video signal generated digital voltage pulses is reduced.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Vermeidung einer Überhitzung eines Displaytreiber-Bausteins eines Plasmadisplays, welcher Displaytreiber-Baustein mehrere Displaytreiber-Elemente aufweist, die eine Vielzahl von Zeilen des Plasmadisplays ansteuern und von denen jedes einem von mehreren Bildbereichen des auf dem Display darzustellenden Bildes eineindeutig zugeordnet ist, mit einer Messeinheit zur Erzeugung eines Messsignals welches eine Information über die Leistungsaufnahme des Displays enthält, einer ausgangsseitig mit der Messeinheit verbundenen Steuersignalerzeugungseinheit zur Erzeugung eines Steuersignals und eine Schaltung, die die Helligkeit der auf dem Display dargestellten Bildsignale reduziert, wenn das Steuersignal von der Steuersignalerzeugungseinheit, die ausgangsseitig mit dieser Schaltung verbunden ist, vorliegt.The invention relates to a device for avoiding overheating a display driver module of a plasma display, which display driver module has multiple display driver elements, which is a variety control lines of the plasma display and each of which one of several image areas of the one to be shown on the display Image is uniquely assigned with a measuring unit for generation a measurement signal which provides information about the power consumption of the display contains, one connected on the output side to the measuring unit Control signal generation unit for generating a control signal and a circuit that shows the brightness of those shown on the display Image signals reduced when the control signal from the control signal generating unit, which is connected on the output side to this circuit, is present.

Es sind bereits Vorrichtungen zur Vermeidung von Überhitzung eines Plasmadisplays bekannt, bei denen die Leistungsaufnahme des Gesamtdisplays gemessen und eine Reduzierung der Helligkeit der auf dem Display dargestellten Bildsignale dann erfolgt, wenn die gemessene Leistung einen vorgegebenen Schwellenwert übersteigt.There are already devices for avoiding overheating of a plasma display known in which the power consumption of the overall display is measured and a reduction in the brightness of that shown on the display Image signals occur when the measured power is a predetermined Threshold exceeds.

Aus der JP09006283 ist es weiterhin bekannt, dem Plasmadisplay und den Displaytreiber-Bausteinen des Plasmadisplays Temperaturmesseinrichtungen zuzuordnen, die die Temperatur des Plasmadisplays und der Displaytreiber erfassen, wobei eine der Temperaturmesseinrichtungen nachgeschaltete Steuerschaltung, bei Überschreiten eines festgelegten Wertes des Temperatursignals, ein Steuersignal erzeugt, das über die Bildschirmtreiberkontrolischaltung das Potenzial oder die Anzahl der Pulse in der Sustainperiode beeinflusst, derart, dass bei ansteigender Temperatur die Helligkeit abnimmt.From JP09006283 it is also known the plasma display and the Display driver components of the plasma display temperature measuring devices assign the temperature of the plasma display and the display driver detect, with one of the temperature measuring devices connected downstream Control circuit when a predetermined value of the temperature signal is exceeded, generates a control signal via the display driver control circuit influences the potential or the number of pulses in the sustain period, such that the brightness decreases as the temperature rises.

Eine mit der JP09198005 bekannt gewordene Anordnung, bedient sich zur Vermeidung partieller unzulässiger Erwärmungen eines Plasmadisplays einer transparenten wärmeleitenden Schicht auf der Frontseite und einer wärmeleitenden Schicht auf der Rückseite des Displays, wobei die wärmeleitenden Schicht auf der Rückseite einen Temperatursensor aufweist, so dass über eine Temperaturüberwachungsschaltung bei einer Erhöhung der Temperatur ein die Helligkeit reduzierendes Steuersignal der Ansteuerschaltung des Plasmadisplays zugeführt wird.An arrangement which has become known with JP09198005 uses the Avoid partial inadmissible heating of a plasma display transparent heat-conducting layer on the front and a heat-conducting Layer on the back of the display, the thermally conductive Layer on the back has a temperature sensor, so that over a Temperature monitoring circuit when the temperature increases Brightness-reducing control signal of the control circuit of the plasma display is fed.

Weiterhin ist es zur Vermeidung partieller unzulässiger Erwärmungen aus der JP07210109 bekannt, den Bildbereich eines Plasmadisplays in Blöcke aufzuteilen, und das Helligkeitssignal eines jeden Blocks dahingehend zu überwachen ob ein vorgegebener Wert überschritten wird, wobei die Überschreitungen über einen entsprechenden Zähler integriert werden, derart, dass, bei überschreiten eines vorgegebene Wertes, eine dem Zähler nachgeordnete Kontrollschaltung ein Signal erzeugt, welches das Helligkeitssignal des Blockes reduziert.Furthermore, it is to avoid partial inadmissible heating from the JP07210109 known to divide the image area of a plasma display into blocks, and monitor the brightness signal of each block whether a predetermined value is exceeded, the exceedances be integrated via a corresponding counter, such that, at exceed a predetermined value, one the counter downstream control circuit generates a signal which is the brightness signal of the block reduced.

Aus der nicht vorveröffentlichten DE-A-197 56 653.7 der Anmelderin ist eine Vorrichtung zur Kühlung eines Displays bekannt. Diese bekannte Vorrichtung weist einen Ventilator auf, der in Abhängigkeit vom Signalinhalt des dem Display zugeführten Videosignals und von der im Bereich des Displays herrschenden Temperatur, eine das Display kühlende Luftströmung erzeugt.From the not previously published DE-A-197 56 653.7 by the applicant is one Device for cooling a display is known. This known device has a fan which, depending on the signal content of the Display supplied video signal and from that in the area of the display prevailing temperature, an air flow cooling the display generates.

Weiterhin ist in der nicht vorveröffentlichten DE-A-197 20 876.2 der Anmelderin eine Vorrichtung zur Kontrasteinstellung bei impulsbreitengesteuerten Bildanzeigen beschrieben. Bei derartigen Bildanzeigen besteht zwischen der Eingangsgröße und der Leuchtdichte des auf dem Bildschirm dargestellten Signals ein digitaler Zusammenhang. Die Bilddarstellung erfolgt unter Verwendung eines Zeitmultiplexverfahrens, bei welchem eine Vollbildperiode, die bei einem Plasmadisplay 20 ms beträgt, in mehrere Teilzeitintervalle zerlegt wird. Während dieser Teilzeitintervalle wird in Abhängigkeit vom jeweils gewünschten Helligkeitswert eine vorgegebene Anzahl von digitalen Spannungsimpulsen zur Displayansteuerung erzeugt.Furthermore, the applicant's unpublished DE-A-197 20 876.2 a device for contrast adjustment in pulse-width-controlled image displays described. In such picture displays there is between the input size and the luminance of the signal displayed on the screen a digital context. The image is displayed using a time-division multiplexing method in which one frame period which is in one Plasma display is 20 ms, is broken down into several part-time intervals. During these part-time intervals, depending on what is desired Brightness value a predetermined number of digital voltage pulses Display control generated.

Der zur Ansteuerung des Displays vorgesehene Displaytreiber-Baustein weist mehrere parallel arbeitende Displaytreiber-Elemente auf. Jedes dieser Displaytreiber-Elemente ist einer vorgegebenen Anzahl von Bildzeilen auf dem Plasmadisplay zugeordnet. Beispielsweise weist ein Displaytreiber-Baustein insgesamt 6 Displaytreiber-Elemente auf, von denen jedem 80 der 480 Zeilen eines Vollbildes zugeordnet sind.The display driver module provided for controlling the display has several display driver elements working in parallel. Each of these display driver elements is a predetermined number of image lines on the Assigned to plasma display. For example, a display driver module a total of 6 display driver elements, each of which 80 of the 480 lines are assigned to a full screen.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen Weg aufzuzeigen, wie auch einzelne Displaytreiber-Elemente des Displaytreiber-Bausteins vor einer Überhitzung geschützt werden können.Based on this prior art, the object of the invention based on showing a way, as well as individual display driver elements of the display driver module can be protected against overheating.

Diese Aufgabe wird durch eine Vorrichtung mit den im Anspruch 1 angegebenen Merkmalen gelöst, vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindungen ergeben sich aus den abhängigen Ansprüchen.This object is achieved by a device with the specified in claim 1 Features solved, advantageous refinements and developments of Inventions result from the dependent claims.

Mittels der Erfindung wird in vorteilhafter Weise erreicht, dass sich beim Betrieb eines Plasmadisplays auch einzelne Displaytreiber-Elemente, ohne dass deren Temperatur erfasst wird, nicht überhitzen können. By means of the invention it is advantageously achieved that during operation a plasma display also individual display driver elements without their Temperature is recorded, can not overheat.

Durch die erfingungsgemäße Auswertung der Belastung jedes einzelnen Treiberelementes kann sichergestellt werden, daß eine alle Displaytreiber-Elemente entlastende Reduzierung der Helligkeit der am Display dargestellten Signale bereits dann durchgeführt wird, wenn auch nur ein einzelnes Treiberelement aufgrund besonderer Helligkeitsverteilungen im Bild übermäßig stark belastet ist.Through the evaluation of the load of each individual according to the invention Driver element can be ensured that all display driver elements Relieving reduction in the brightness of the on the display shown signals is already carried out, if only one single driver element due to special brightness distributions in the Image is overly stressed.

Weitere vorteilhafte Eigenschaften der Erfindung ergeben sich aus deren beispielhafter Erläuterung anhand der Figur, die ein Blockschaltbild zur Erläuterung einer Vorrichtung gemäß der Erfindung zeigt.Further advantageous properties of the invention result from the invention exemplary explanation with reference to the figure, which is a block diagram Explanation of a device according to the invention shows.

Die gezeigte Vorrichtung weist einen Eingang E auf, über welchen der Vorrichtung ein Videosignal zugeführt wird. Dieses Video- und/oder Bildsignal ist aus dem Videosignalweg einer Bildquelle, wie beispeilsweise Fernsehempfänger oder PC abgeleitet, welcher mit einem Plasmadisplay 1 versehen ist, auf dem dem Videosignal entsprechende Bilder dargestellt werden. Derartige Plasmadisplays haben eine hohe Leistungsaufnahme, auf Grund derer Maßnahmen notwendig sind, mit deren Hilfe eine Überhitzung des Displays vermieden wird.The device shown has an input E, via which the Device a video signal is supplied. This video and / or Image signal is from the video signal path of an image source, such as TV receiver or PC derived, which with a plasma display 1 is provided on which images corresponding to the video signal are shown become. Such plasma displays have a high power consumption Because of which measures are necessary, with the help of overheating of the display is avoided.

Dies geschieht bei der gezeigten Vorrichtung unter Verwendung einer Steuersignalerzeugungseinheit 2, die ein Steuersignal ST1 und/oder ST2 erzeugt, unter deren Verwendung die Helligkeit der auf dem Display dargestellten Bildsignale reduziert wird.This is done in the device shown using a Control signal generating unit 2, the control signal ST1 and / or ST2 generated using the brightness of the on the display shown image signals is reduced.

Zur Erzeugung dieses Steuersignals wertet die Steuersignalerzeugungseinheit 2 Signale aus, die ihr von einem Temperaturfühler 3 und von insgesamt sechs Integratoren 4a,...,4f zugeführt werden. Der Temperaturfühler 3 ist im Bereich des Displays 1 angeordnet und zur Messung der im Bereich des Displays 1 herrschenden Temperatur vorgesehen. Die Integratoren 4a,...,4f sind mit dem Ausgang eines im Videosignalweg angeordneten steuerbaren Verstärkers 5 über einen A/D-Wandler 6 und eine digitale Signalverarbeitungsschaltung 7 verbunden. Dem Eingang des steuerbaren Verstärkers 5 wird das am Eingang E der Vorrichtung anliegende Signal zugeführt. Ein Ausgangssignal der digitalen Signalverarbeitungsschaltung 7 wird über einen Displaytreiber-Baustein 8 dem Plasmadisplay zugeführt.The control signal generation unit evaluates to generate this control signal 2 signals from you from a temperature sensor 3 and from a total of six integrators 4a, ..., 4f are supplied. The Temperature sensor 3 is arranged in the area of the display 1 and for Measurement of the temperature prevailing in the area of the display 1 intended. The integrators 4a, ..., 4f are connected to the output of an Controllable amplifier 5 arranged in the video signal path via an A / D converter 6 and a digital signal processing circuit 7 connected. The input of the controllable amplifier 5 is the at the input E Device applied signal supplied. An output signal of the digital Signal processing circuit 7 is via a display driver module 8 fed to the plasma display.

Der Displaytreiber-Baustein 8 weist insgesamt sechs DisplaytreiberElemente auf. Jedes dieser sechs Displaytreiber-Elemente ist 80 Zeilen des darzustellenden Vollbildes zugeordnet, welches insgesamt 480 Zeilen aufweist. Beispielsweise sind dem Displaytreiber-Element 1 die Zeilen 1-80, dem Displaytreiber-Element 2 die Zeilen 81-160, dem Displaytreiber-Element 3 die Zeilen 161-240, dem Displaytreiber-Element 4 die Zeilen 241-320, dem Display-treiber-Element 5 die Zeilen 321-400 und dem Displaytreiber-Element 6 die Zeilen 401-480 zugeordnet.The display driver module 8 has a total of six display driver elements on. Each of these six display driver elements is 80 lines of to be displayed full screen, which has a total of 480 lines having. For example, the display driver element 1 is lines 1-80, lines 81-160, the display driver element 2, the display driver element 3 lines 161-240, display driver element 4 lines 241-320, lines 321-400 and the display driver element 5 Display driver element 6 assigned to lines 401-480.

Der digitalen Signalverarbeitungsschaltung 7 gehören unter anderem eine Bildspeicherschaltung und eine Interpolationsschaltung an, mittels welcher das nach dem PAL-Standard angelieferte Eingangssignal, welches 625 Zeilen pro Vollbild aufweist, in ein 480-Zeilen-Signal umgewandelt wird, wie es zur Darstellung auf dem Plasma-display 1 vorgesehen ist.The digital signal processing circuit 7 includes, among others Image storage circuit and an interpolation circuit, by means of which the input signal delivered according to the PAL standard, which 625 Lines per frame, is converted into a 480-line signal, such as it is intended for display on the plasma display 1.

Das Steuersignal ST1 wird dem Steuereingang des Verstärkers 5 zugeführt. Das Steuersignal ST2 wird an den Displaytreiber-Baustein 8 angelegt.The control signal ST1 is fed to the control input of the amplifier 5. The control signal ST2 is applied to the display driver module 8.

In der Steuersignalerzeugungseinheit 2 wird das vom Temperaturfühler 3 zur Verfügung gestellte Signal mit vorgegebenen Temperaturschwellenwerten verglichen, die beispielsweise bei 70°C, 80°C und 90°C liegen, um eine temperaturabhängige Reduzierung der Helligkeit des auf dem Bildschirm dargestellten Bildes durchzuführen. In the control signal generating unit 2, the temperature sensor 3 becomes Provided signal with predefined temperature threshold values compared, which are for example at 70 ° C, 80 ° C and 90 ° C by one temperature-dependent reduction in the brightness of the on-screen shown image.

Weiterhin werden in der Steuersignalerzeugungseinheit 2 auch die Ausgangssignale der Integratoren 4a,....,4f ausgewertet. Jeder dieser Integratoren 4a,...,4f ist 80 Zeilen des Videosignals zugeordnet, so daß dem Integrator 4a der in den Zeilen 1-80 übertragene Videoinhalt, dem Integrator 4b der in den Zeilen 81-160 übertragene Videoinhalt, dem Integrator 4c der in den Zeilen 161-240 übertragene Videoinhalt, dem Integrator 4d der in den Zeilen 241-320 übertragene Videoinhalt, dem Integrator 4e der in den Zeilen 321-400 übertragene Videoinhalt und dem Integrator 4f der in den Zeilen 401-480 übertragene Videoinhalt zugeführt wird.Furthermore, in the control signal generation unit 2 Output signals of the integrators 4a, ...., 4f evaluated. Each of these Integrators 4a, ..., 4f are assigned 80 lines of the video signal, so that Integrator 4a the video content transmitted in lines 1-80, the integrator 4b the video content transmitted in lines 81-160, the integrator 4c in lines 161-240 transmitted video content, the integrator 4d the in the Lines 241-320 transmitted video content, the integrator 4e that in the lines 321-400 transmitted video content and the integrator 4f the in the lines 401-480 transmitted video content is fed.

Mittels dieser Integratoren erfolgt eine Auswertung des Videosignals im Hinblick auf die darin enthaltenen Hell- und Dunkelanteile. Die im Rahmen dieser Integrationsvorgänge ermittelten Signalwerte werden der Steuersignalerzeugungseinheit 2 zugeführt und in dieser jeweils mit einem vorgegebenen Schwellenwert verglichen. Ergibt eine derartige Auswertung über ein vorgegebenes Zeitintervall, daß das einem Integrator zugehörige Ausgangssignal diesen vorgegebenen Schwellenwert in mehr als 90% der Fälle übersteigt, dann läßt dies auf eine übermäßig starke Belastung des jeweils zugehörigen Displaytreiber-Elementes im Displaytreiber-Baustein 8 schließen.Using these integrators, the video signal is evaluated in the With regard to the light and dark components contained therein. The in the frame of these integration processes signal values are the Control signal generation unit 2 supplied and in this each with a predetermined threshold value compared. Such an evaluation results over a predetermined time interval that the one belonging to an integrator Output signal this predetermined threshold in more than 90% of the Exceeds cases, then this leads to an excessive burden on the each associated display driver element in the display driver module 8 conclude.

Um eine Überhitzung und Zerstörung dieses Displaytreiber-Elementes zu verhindern, generiert die Steuersignal-erzeugungseinheit 2 in diesem Fall ein Steuersignal ST1 und/oder ST2, auf Grund dessen die Verstärkung des Verstärkers 5 reduziert bzw. der Displaytreiber-Baustein 8 angesteuert wird, um die Helligkeit des auf dem Display 1 dargestellten Videosignals zu reduzieren. Dies bedeutet eine Verringerung der Belastung aller sechs im Displaytreiber-Baustein 8 vorgesehenen Displaytreiber-Elemente. Diese Steuersignalerzeugung zur Reduzierung der Helligkeit erfolgt bei Vorliegen einer übermäßig starken Belastung eines der Displaytreiber-Elemente auch dann, wenn die vom Temperaturfühler 3 abgeleiteten Signale noch nicht auf eine Überhitzung des gesamten Displays schließen lassen. To overheat and destroy this display driver element prevent, the control signal generating unit 2 generates in this case a control signal ST1 and / or ST2, on the basis of which the gain of Amplifier 5 is reduced or the display driver module 8 is activated, to the brightness of the video signal shown on the display 1 to reduce. This means a reduction in the load on all six in the Display driver module 8 provided display driver elements. This Control signal generation for reducing the brightness takes place when present an excessive load on one of the display driver elements then when the signals derived from the temperature sensor 3 are not yet on cause the entire display to overheat.

Eine übermäßig starke Belastung eines der Displaytreiber-Elemente könnte beispielsweise dann auftreten, wenn auf dem Plasmadisplay 1 für einen längeren Zeitraum ein Bildsignal dargestellt wird, welches in den oberen 80 Zeilen des Bildes sehr helle Bildanteile enthält, während die insgesamt 400 darunterliegenden Zeilen dunkle Bildinhalte aufweisen.An excessive load on one of the display driver elements could result occur, for example, when on the plasma display 1 for one an image signal is displayed for a longer period of time, which in the upper 80th Lines of the picture contains very bright parts of the picture, while the total of 400 lines below have dark image content.

Mittels des Displaytreiber-Bausteins 8 wird das von der Videosignalverarbeitungsschaltung 7 zur Verfügung gestellte digitale Signal in ein zur Ansteuerung des Plasmadisplays 1 geeignetes Signal umgewandelt. Zu diesem Zweck wird das digitale Bildsignal zeitlich in mehrere Teilzeitintervalle zerlegt, während derer in Abhängigkeit vom jeweils vorliegenden Helligkeitswert eine dem Helligkeitswert entsprechende Anzahl von Spannungsimpulsen zur Displayansteuerung erzeugt wird. Ein derartiges Vorgehen ist beispielsweise in der bereits oben genannten DE-A-(Köchel) der Anmelderin sowie dem dort angegebenen Stand der Technik beschrieben.By means of the display driver module 8, the Video signal processing circuit 7 provided digital signal into a signal suitable for driving the plasma display 1 converted. For this purpose, the digital image signal is timed in divided several part-time intervals, during which depending on the each present brightness value corresponds to the brightness value Number of voltage pulses for display control is generated. Such a procedure is, for example, the one already mentioned above DE-A- (Köchel) of the applicant and the status of the Technology described.

Die oben genannte Reduzierung der Helligkeit der auf dem Display dargestellten Bildsignale geschieht im Displaytreiber-Baustein 8 dadurch, daß die Anzahl der in einem oder mehreren Teilzeitintervallen einer Vollbildperiode des Videosignals erzeugten digitalen Spannungsimpulse reduziert wird.The above reduction in the brightness of the display The image signals shown happen in the display driver module 8 in that that the number of one in one or more part-time intervals Frame period of the video signal generated digital voltage pulses is reduced.

Claims (6)

  1. Device for preventing overheating of a display driver module of a plasma display, which display driver module comprises several display driver elements which control a multiplicity of lines of the plasma display and each of which is assigned, with one-to-one correspondence, to one of several image areas of the image to be represented on the display, comprising
    a measuring unit (4a, ..., 4f) for generating a measurement signal which contains information about the power consumption of the display,
    a control signal generating unit (2), connected on the output side to the measuring unit, for generating a control signal (ST1, ST2), and
    a circuit (5, 8) which reduces the brightness of the image signals represented on the display if the control signal from the control signal generating unit connected on the output side to this circuit is present,
    characterized in that
    the measuring unit comprises several integrators (4a, ..., 4f), arranged in parallel to one another, which are respectively assigned, with one-to-one correspondence, to one of the above-mentioned several image areas, the integrator integrating the bright and dark values of the image data of the image area assigned with one-to-one correspondence, determining a signal value therefrom and transmitting this signal value, as a measurement signal, to the control signal generating unit (2) to which the integrators (4a, ..., 4f) are respectively connected on the output side,
    the control signal generating unit (2) then generates the control signal (ST1, ST2) which reduces the brightness of the signals represented on the display and outputs it to the circuit (5, 8) if at least one of the measurement signals from the several integrators (4a, ..., 4f) exceeds a predefined threshold value.
  2. Device according to claim 1,
    said device comprising an image signal processing circuit (7) which comprises image storage means and is connected on the output side to the integrators (4a, ..., 4f).
  3. Device according to claim 2,
    the image signal processing circuit (7) comprising an interpolator.
  4. Device according to either of claims 2 or 3,
    the image signal processing circuit (7) being provided for the purpose of converting any input signal into a form suitable for representation of the signal on a display, particularly a plasma display.
  5. Device according to any one of claims 2 to 4,
    the image signal processing circuit (7) being provided for the purpose of converting the line count of a PAL input signal into a line count suitable for representation of the signal on a plasma display.
  6. Display according to claim 1,
    the circuit for reducing the brightness of the image signals represented on the display reducing, in dependence on the control signal, the number of digital voltage pulses generated in one or more partial time intervals of a full-frame period of the image signal.
EP98124634A 1998-01-13 1998-12-23 Device for avoiding overheating the display driver components of a plasma display Expired - Lifetime EP0930603B1 (en)

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DE19800846A DE19800846C2 (en) 1998-01-13 1998-01-13 Device for avoiding overheating of a display driver component of a plasma display
DE19800846 1998-01-13

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DE19925725B4 (en) * 1999-06-07 2005-06-09 Grundig Multimedia B.V. Device for cooling a display
JP3270435B2 (en) * 1999-10-04 2002-04-02 松下電器産業株式会社 Display device and brightness control method thereof
DE10328794A1 (en) * 2003-06-26 2005-01-13 Grundig Aktiengesellschaft Control of operation of a television receiver by monitoring operational parameters to warn of life affecting conditions
DE102019204124A1 (en) * 2019-03-26 2020-10-01 Robert Bosch Gmbh Temperature-dependent operation of a screen

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JP3140069B2 (en) * 1991-02-12 2001-03-05 パイオニア株式会社 Display device
KR940002290B1 (en) * 1991-09-28 1994-03-21 삼성전관 주식회사 Image display device of flat type
JP2856241B2 (en) * 1993-11-17 1999-02-10 富士通株式会社 Gradation control method for plasma display device
JPH0865607A (en) * 1994-08-19 1996-03-08 Fujitsu General Ltd Plasma display device
JPH08251515A (en) * 1995-03-09 1996-09-27 Fujitsu General Ltd Method for preventing burning of display device

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EP0930603A3 (en) 1999-12-15
EP0930603A2 (en) 1999-07-21
DE59811237D1 (en) 2004-05-27
DE19800846C2 (en) 1999-12-09

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