EP0866440A2 - LED matrix display - Google Patents
LED matrix display Download PDFInfo
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- EP0866440A2 EP0866440A2 EP98102263A EP98102263A EP0866440A2 EP 0866440 A2 EP0866440 A2 EP 0866440A2 EP 98102263 A EP98102263 A EP 98102263A EP 98102263 A EP98102263 A EP 98102263A EP 0866440 A2 EP0866440 A2 EP 0866440A2
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- display
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- display device
- error
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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
- G09G3/30—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 electroluminescent panels
- G09G3/32—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S345/00—Computer graphics processing and selective visual display systems
- Y10S345/904—Display with fail/safe testing feature
Definitions
- the invention relates to a light-emitting diode matrix display device, in particular for outdoor use, with display points arranged in rows and columns, which can be controlled by means of a control device and by means of a monitoring device are monitored for display errors.
- DE 27 27 800 is in shape for a light-emitting diode display device a 7-segment display specified a monitoring device for display errors, which has a current sensor transistor. Such a monitoring device to use with an LED matrix is not an option because, because of the large number of display points, a lot of effort is required would.
- a similar monitoring device for a light emitting diode display device in a segment display, DE 36 20 584 A1 also shows whereby the open collector output of the segment display is used. Also this type of monitoring device is for a light-emitting diode matrix display device not suitable.
- DE 40 24 499 C1 shows a matrix display device in which the display points are formed by means of the light exit sides of optical fibers will.
- bistable closure elements are used arranged above the light exit side of the optical fibers.
- To open or closing the fasteners are set or Reset pulses applied, which are monitored by means of respective optocouplers will.
- the invention is based on the object of a generic light-emitting diode matrix display device to provide a with simple training provides reliable function monitoring.
- the monitoring device is a current monitoring device with current sensors with which a drive current each Display point detectable and the relevant device by means of the monitoring device Display point can be assigned. With these measures, every display point the display device monitors and localization of the incorrect display point.
- the effort for the control of the display device and the required Performance with simultaneous safe function monitoring of the individual display points are reduced by one per row or per column Current collector is provided and that the coordinate points of the correspondingly activating display points corresponding columns and rows in the Multiplex operation can be controlled with a frequency that activates the controlled LEDs above the flicker fusion frequency of the Eye results.
- An optimal display quality is maintained, whereby a high luminance can be achieved by the level of the control pulses can be adjusted to given external lighting conditions using pulse width modulation is.
- the location of the activated display point can be easily determined be that current signals fed back via a feedback line Current collector in the control device due to the existing in the same Time information of the line control in connection with the time information the column control with regard to an error of the to be activated Display point can be evaluated.
- the optocoupler can be connected in parallel, the drive current detected potential-free and the information about it to the control device be returned for evaluation without influencing the control becomes.
- Fault memory has that each display module according to the claims 2 to 5 is controllable and that the overall display by means of the control device can be assembled from the displays of the individual display modules.
- the monitoring device can be perfected in that per Display module a reference element is provided with which a long-term change the display properties of the display module can be detected, and / or that a temperature sensor is provided per display module and that a reference element signal or a temperature sensor signal with respect to a Deviation from a target value can be evaluated by means of the control unit.
- a corresponding Information on replacing the display module output will.
- a ventilation be switched on.
- the display device has a light-emitting diode matrix with in Rows y and columns x arranged display points L by a Light-emitting diode or a group of light-emitting diodes are formed.
- a Group of LEDs per display point L can e.g. increased display luminance achieved with high ambient luminance or color representations will.
- the display points L are from a control unit ST with a drive current supplied by the respective activated display point AL by Addressing the corresponding coordinate point x, y via an associated one Row control line ZL and an assigned column control line SL is fed.
- a current collector S is arranged, with which the control current of the activated display point AL (illuminated point) detected and fed to the control unit ST via a feedback line ME.
- a fault memory FSP is arranged in the control unit ST, in which a ID is stored in the event of a missing or faulty control current.
- an arrangement of the current sensors S in the Column control lines SL possible.
- the display points L are driven via a series resistor R v located in the line drive line ZL.
- the current sensor S in the form of an optocoupler OK is connected in parallel with the series resistor R v in series with a measuring resistor R M.
- the optocoupler OK gives a potential-free current measurement and does not falsify the control current.
- An entire display device can be composed of several display modules be according to the description above are built up.
- a control device of which the control unit ST with The fault memory FSP forms part of the display of the individual Display modules are coordinated to the overall display. Every display module has its own monitoring device with which the display errors within of the display module can be determined and evaluated. It is also possible a further error analysis of the display modules in the parent Control device to perform.
- the error detection in the control unit takes place in connection with that in the Control unit available control information of the individual display points L.
- the control of the display points L is row by row and column by column Multiplex operation carried out, with only one display module at a time one display point L, which may consist of several light-emitting diodes can exist, is controlled.
- the drive frequency is so high that the intermittent activation is not perceived by the eye, i.e. is above the flicker fusion frequency.
- the luminance of the display points L can be selected by means of pulse width modulation, whereby relatively high instantaneous luminance levels can be achieved by controlling the pulse width are.
- the information known how high the respective control current must be so that by comparison with the feedback signal of the current collector L also the failure of individual LEDs by comparison with the respective setpoint can be determined.
- the correct color representation can be inferred in this way will.
- Evaluation unit determines the necessary conclusions for error handling will. It can be decided whether an error message in the event of failure one or more display points L should take place. With a certain adjustable Number of missing active display points AL can the display device due to representations that are no longer clearly recognizable (mutilation) should be switched off.
- a reference element RE can be provided; in the event of a deviation from a predefinable one
- the setpoint can be set via the control unit or control device appropriate information for replacing the display module is output will.
- a temperature sensor TS can be provided at a suitable point be e.g. to activate a cooling device or the display device at Danger of switching off.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Leuchtdiodenmatrix-Anzeigevorrichtung, insbesondere für den Außenbereich, mit in Zeilen und Spalten angeordneten Anzeigepunkten, die mittels einer Steuereinrichtung ansteuerbar sind und mittels einer Überwachungseinrichtung auf Anzeigefehler überwacht sind.The invention relates to a light-emitting diode matrix display device, in particular for outdoor use, with display points arranged in rows and columns, which can be controlled by means of a control device and by means of a monitoring device are monitored for display errors.
Es wird davon ausgegangen, daß eine derartige Leuchtdiodenmatrix-Anzeigevorrichtung mit Überwachungseinrichtung auf Anzeigefehler bekannt ist. Die Überwachungseinrichtung ist hierbei aufwendig und nicht in der Lage, eine fehlerhafte Anzeige ortsgenau zu erfassen. It is believed that such an LED matrix display device with monitoring device for display errors is known. The Monitoring device is complex and not able to to record faulty display precisely.
In der DE 27 27 800 ist bei einer Leuchtdioden-Anzeigevorrichtung in Form einer 7-Segmentanzeige eine Überwachungseinrichtung auf Anzeigefehler angegeben, die einen Stromsensortransistor aufweist. Eine derartige Überwachungseinrichtung bei einer Leuchtdiodenmatrix einzusetzen, bietet sich nicht an, da wegen der Vielzahl der Anzeigepunkte ein hoher Aufwand erforderlich wäre. Eine ähnliche Überwachungseinrichtung für eine Leuchtdioden-Anzeigevorrichtung bei einer Segmentanzeige zeigt auch die DE 36 20 584 A1, wobei der Offen-Kollektor-Ausgang der Segmentanzeige ausgenutzt wird. Auch diese Art der Überwachungseinrichtung ist für eine Leuchtdiodenmatrix-Anzeigevorrichtung nicht geeignet.DE 27 27 800 is in shape for a light-emitting diode display device a 7-segment display specified a monitoring device for display errors, which has a current sensor transistor. Such a monitoring device to use with an LED matrix is not an option because, because of the large number of display points, a lot of effort is required would. A similar monitoring device for a light emitting diode display device in a segment display, DE 36 20 584 A1 also shows whereby the open collector output of the segment display is used. Also this type of monitoring device is for a light-emitting diode matrix display device not suitable.
Aus der DE 40 24 499 C1 geht eine Matrix-Anzeigevorrichtung hervor, bei der die Anzeigepunkte mittels der Lichtaustrittsseiten von Lichtleitfasern gebildet werden. Um verschiedene Anzeigen zu erzeugen, sind bistabile Verschlußelemente über der Lichtaustrittsseite der Lichtleitfasern angeordnet. Zum Öffnen bzw. Schließen der Verschlüsse werden an diese zeilen- und spaltenweise Setz- bzw. Rücksetzimpulse angelegt, die mittels jeweiliger Optokoppler überwacht werden. Zum Feststellen, ob die Anzeigepunkte tatsächlich leuchten, ist eine gesonderte Überwachungsschaltung erforderlich.DE 40 24 499 C1 shows a matrix display device in which the display points are formed by means of the light exit sides of optical fibers will. To generate various displays, bistable closure elements are used arranged above the light exit side of the optical fibers. To open or closing the fasteners are set or Reset pulses applied, which are monitored by means of respective optocouplers will. To determine whether the indicator points are lit, is one separate monitoring circuit required.
Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Leuchtdiodenmatrix-Anzeigevorrichtung bereitzustellen, die bei einfacher Ausbildung eine zuverlässige Funktionsüberwachung bietet.The invention is based on the object of a generic light-emitting diode matrix display device to provide a with simple training provides reliable function monitoring.
Diese Aufgabe wird mit den Merkmalen des Anspruches 1 gelöst. Hiernach ist also vorgesehen, daß die Überwachungseinrichtung eine Stromüberwachungseinrichtung mit Stromaufnehmer aufweist, mit denen ein Ansteuerstrom jedes Anzeigepunktes erfaßbar und mittels der Überwachungseinrichtung dem betreffenden Anzeigepunkt zuordenbar ist. Mit diesen Maßnahmen ist jeder Anzeigepunkt der Anzeigevorrichtung überwacht und eine Lokalisierung des fehlerhaften Anzeigepunktes gegeben.This object is achieved with the features of claim 1. After that is thus provided that the monitoring device is a current monitoring device with current sensors with which a drive current each Display point detectable and the relevant device by means of the monitoring device Display point can be assigned. With these measures, every display point the display device monitors and localization of the incorrect display point.
Der Aufwand für die Ansteuerung der Anzeigevorrichtung und die benötigte Leistung bei gleichzeitiger sicherer Funktionsüberwachung der einzelnen Anzeigepunkte werden dadurch verringert, daß pro Zeile oder pro Spalte ein Stromaufnehmer vorgesehen ist und daß die den Koordinatenpunkten der zu aktivierenden Anzeigepunkte entsprechenden Spalten und Zeilen zyklisch im Multiplexbetrieb mit einer Frequenz ansteuerbar sind, die eine Aktivierung der anzusteuernden Leuchtdioden oberhalb der Flimmerverschmelzungsfrequenz des Auges ergibt. Dabei wird eine optimale Anzeigequalität aufrechterhalten, wobei durch die Höhe der Ansteuerimpulse eine hohe Leuchtdichte erreichbar ist, die mittels Pulsweitenmodulation auf gegebene äußere Lichtverhältnisse abstimmbar ist.The effort for the control of the display device and the required Performance with simultaneous safe function monitoring of the individual display points are reduced by one per row or per column Current collector is provided and that the coordinate points of the correspondingly activating display points corresponding columns and rows in the Multiplex operation can be controlled with a frequency that activates the controlled LEDs above the flicker fusion frequency of the Eye results. An optimal display quality is maintained, whereby a high luminance can be achieved by the level of the control pulses can be adjusted to given external lighting conditions using pulse width modulation is.
Der Ort des jeweils aktivierten Anzeigepunktes kann dadurch einfach festgestellt werden, daß über eine Rückmeldeleitung zurückgeführte Stromsignale der Stromaufnehmer in der Steuereinrichtung aufgrund der in derselben vorhandenen Zeitinformation der Zeilenansteuerung in Verbindung mit der Zeitinformation der Spaltenansteuerung hinsichtlich eines Fehlers des zu aktivierenden Anzeigepunktes auswertbar sind. Mit der Maßnahme, daß die Stromaufnehmer durch den Zeichenansteuerleitungen bzw. Spaltenansteuerleitungen parallel geschaltete Optokoppler gebildet sind, kann der Ansteuerstrom potentialfrei erfaßt und die Information darüber an die Steuereinrichtung zur Auswertung zurückgeführt werden, ohne daß die Ansteuerung beeinflußt wird. The location of the activated display point can be easily determined be that current signals fed back via a feedback line Current collector in the control device due to the existing in the same Time information of the line control in connection with the time information the column control with regard to an error of the to be activated Display point can be evaluated. With the measure that the Current collector through the character control lines or column control lines The optocoupler can be connected in parallel, the drive current detected potential-free and the information about it to the control device be returned for evaluation without influencing the control becomes.
Verschiedene Auswertungen und Reaktionen in einem Fehlerfall werden auf einfache Weise dadurch ermöglicht, daß die Steuereinrichtung einen Fehlerspeicher aufweist, in dem Fehlermeldungen hinterlegbar sind, und daß aufgrund der hinterlegten Fehlermeldungen eine Fehleranzeige und/oder Ausschaltung der Anzeigevorrichtung steuerbar ist. Beispielsweise kann dadurch das Fehlerkriterium von mehreren aufeinanderfolgenden Messungen abhängig gemacht werden. Es kann entschieden werden, ob eine Fehlermeldung bei Ausfall eines oder mehrerer Leuchtpunkte erfolgen soll oder ob bei einer bestimmten einstellbaren Anzahl von fehlenden Leuchtpunkten die Anzeigevorrichtung wegen nicht mehr eindeutig erkennbaren Darstellungen (Verstümmelung) ausgeschaltet werden soll.Various evaluations and reactions in the event of an error are based on simple way that the control device allows a fault memory has, in which error messages can be stored, and that because the stored error messages an error display and / or switching off the Display device is controllable. For example, the error criterion made dependent on several successive measurements will. It can be decided whether an error message if a or several luminous dots is to take place or whether with a certain adjustable Number of missing luminous dots due to the display device representations that are no longer clearly recognizable (mutilation) are switched off shall be.
Um eine großflächige Anzeige bei zuverlässigem Betrieb zu ermöglichen, ist vorgesehen, daß sie aus mehreren Anzeigemodulen zusammengesetzt ist, daß jedes Anzeigemodul eine zu der Steuereinrichtung gehörende Steuereinheit mit Fehlerspeicher aufweist, daß jedes Anzeigemodul entsprechend den Ansprüchen 2 bis 5 steuerbar ist und daß mittels der Steuereinrichtung die Gesamtanzeige aus den Anzeigen der einzelnen Anzeigemodulen zusammensetzbar ist. Mit diesen Maßnahmen kann auch festgestellt werden, ob ein Anzeigemodul ausgewechselt werden muß.To enable a large-scale display with reliable operation, is provided that it is composed of several display modules that each display module has a control unit belonging to the control device Fault memory has that each display module according to the claims 2 to 5 is controllable and that the overall display by means of the control device can be assembled from the displays of the individual display modules. With These measures can also be used to determine whether a display module has been replaced must become.
Die Überwachungseinrichtung kann dadurch vervollkommnet werden, daß pro Anzeigenmodul ein Referenzelement vorgesehen ist, mit dem eine Langzeitveränderung der Anzeigeeigenschaften des Anzeigemoduls erfaßbar ist, und/oder daß ein Temperatursensor pro Anzeigemodul vorgesehen ist und daß ein Referenzelementsignal bzw. ein Temperatursensorsignal hinsichtlich einer Abweichung von einem Sollwert mittels der Steuereinheit auswertbar ist/sind. The monitoring device can be perfected in that per Display module a reference element is provided with which a long-term change the display properties of the display module can be detected, and / or that a temperature sensor is provided per display module and that a reference element signal or a temperature sensor signal with respect to a Deviation from a target value can be evaluated by means of the control unit.
Verringert sich z.B. die erzielbare Leuchtdichte bis unter eine vorgebbare Schwelle oder ändern sich bei einer Farb-Anzeigevorrichtung die Farbwerte gegenüber einem Referenzwert um ein vorgebbares Maß, so kann eine entsprechende Information zum Auswechseln des Anzeigemoduls ausgegeben werden. Auf der Grundlage des Temperatursensorsignals kann z.B. eine Lüftung eingeschaltet werden.E.g. decreases the achievable luminance below a predeterminable Threshold or change the color values in a color display device compared to a reference value by a predeterminable amount, a corresponding Information on replacing the display module output will. Based on the temperature sensor signal, e.g. a ventilation be switched on.
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnungen näher erläutert. Es zeigen:
- Fig. 1
- schematisch den Aufbau einer Leuchtdiodenmatrix-Anzeigevorrichtung und
- Fig. 2
- einen Ausschnitt der Leuchtdiodenmatrix-Anzeigevorrichtung nach Fig. 1 mit einer genaueren Darstellung eines Stromaufnehmers.
- Fig. 1
- schematically the structure of a light-emitting diode matrix display device and
- Fig. 2
- a section of the light emitting diode matrix display device according to FIG. 1 with a more precise representation of a current sensor.
In den Fig. 1 und 2 ist schematisch der Aufbau einer Leuchtdiodenmatrix-Anzeigevorrichtung wiedergegeben und die Funktionsweise verdeutlicht.1 and 2, the structure of a light-emitting diode matrix display device is schematic reproduced and the mode of operation clarified.
Gemäß Fig. 1 weist die Anzeigevorrichtung eine Leuchtdiodenmatrix mit in Zeilen y und Spalten x angeordneten Anzeigepunkten L auf, die von einer Leuchtdiode oder einer Gruppe von Leuchtdioden gebildet werden. Mit einer Gruppe von Leuchtdioden pro Anzeigepunkt L können z.B. erhöhte Anzeigeleuchtdichten bei hohen Umgebungsleuchtdichten oder Farbdarstellungen erzielt werden. 1, the display device has a light-emitting diode matrix with in Rows y and columns x arranged display points L by a Light-emitting diode or a group of light-emitting diodes are formed. With a Group of LEDs per display point L can e.g. increased display luminance achieved with high ambient luminance or color representations will.
Die Anzeigepunkte L werden von einer Steuereinheit ST aus mit einem Ansteuerstrom versorgt, der dem jeweiligen aktivierten Anzeigepunktes AL durch Ansprechen des entsprechenden Koordinatenpunktes x,y über eine zugehörige Zeilenansteuerleitung ZL und eine zugeordnete Spaltenansteuerleitung SL zugeführt wird. In dem Strompfad, und zwar vorliegend in der Zeilenansteuerleitung ZL jedes Anzeigepunktes L, ist ein Stromaufnehmer S angeordnet, mit dem der Ansteuerstrom des aktivierten Anzeigepunktes AL (Leuchtpunktes) erfaßt und über eine Rückmeldeleitung ME der Steuereinheit ST zugeführt wird. In der Steuereinheit ST ist ein Fehlerspeicher FSP angeordnet, in dem eine Kennung bei ausbleibendem oder fehlerhaftem Ansteuerstrom hinterlegt wird. Alternativ ist auch eine Anordnung der Stromaufnehmer S in den Spaltenansteuerleitungen SL möglich.The display points L are from a control unit ST with a drive current supplied by the respective activated display point AL by Addressing the corresponding coordinate point x, y via an associated one Row control line ZL and an assigned column control line SL is fed. In the current path, in this case in the row drive line ZL of each display point L, a current collector S is arranged, with which the control current of the activated display point AL (illuminated point) detected and fed to the control unit ST via a feedback line ME. A fault memory FSP is arranged in the control unit ST, in which a ID is stored in the event of a missing or faulty control current. Alternatively, an arrangement of the current sensors S in the Column control lines SL possible.
Wie aus Fig. 2 ersichtlich, werden die Anzeigepunkte L über einen in der Zeilenansteuerleitung ZL liegenden Vorwiderstand Rv angesteuert. Der Stromaufnehmer S in Form eines Optokopplers OK ist dem Vorwiderstand Rv in Reihe mit einem Meßwiderstand RM parallel geschaltet. Der Optokoppler OK gibt eine potentialfreie Strommessung und verfälscht den Ansteuerstrom nicht.As can be seen from FIG. 2, the display points L are driven via a series resistor R v located in the line drive line ZL. The current sensor S in the form of an optocoupler OK is connected in parallel with the series resistor R v in series with a measuring resistor R M. The optocoupler OK gives a potential-free current measurement and does not falsify the control current.
Eine gesamte Anzeigevorrichtung kann aus mehreren Anzeigemodulen zusammengesetzt sein, die entsprechend der vorstehenden Beschreibung aufgebaut sind. Mittels einer Steuereinrichtung, von der die Steuereinheit ST mit dem Fehlerspeicher FSP einen Teil bildet, kann die Anzeige der einzelnen Anzeigemodulen zu der Gesamtanzeige koordiniert werden. Jedes Anzeigemodul hat eine eigene Überwachungseinrichtung, mit der die Anzeigefehler innerhalb des Anzeigemoduls festgestellt und ausgewertet werden können. Es ist auch möglich, eine weitere Fehleranalyse der Anzeigemodulen in der übergeordneten Steuereinrichtung durchzuführen. An entire display device can be composed of several display modules be according to the description above are built up. By means of a control device, of which the control unit ST with The fault memory FSP forms part of the display of the individual Display modules are coordinated to the overall display. Every display module has its own monitoring device with which the display errors within of the display module can be determined and evaluated. It is also possible a further error analysis of the display modules in the parent Control device to perform.
Die Fehlererfassung in der Steuereinheit erfolgt in Verbindung mit der in der Steuereinheit vorhandenen Ansteuerinformation der einzelnen Anzeigepunkte L. Die Ansteuerung der Anzeigepunkte L wird zeilenweise und spaltenweise im Multiplexbetrieb vorgenommen, wobei pro Anzeigemodul zu einer Zeit nur jeweils ein Anzeigepunkt L, der gegebenenfalls aus mehreren Leuchtdioden bestehen kann, angesteuert wird. Die Ansteuerfrequenz ist dabei so hoch, daß die intermittierende Ansteuerung vom Auge nicht wahrgenommen wird, d.h. oberhalb der Flimmerverschmelzungsfrequenz liegt. Die Leuchtdichte der Anzeigepunkte L kann dabei mittels Pulsweitenmodulation gewählt werden, wobei durch die Pulsweitenansteuerung relativ hohe momentane Leuchtdichten erzielbar sind. Da in der Steuereinheit ST die Ansteuerzeitpunkte der jeweiligen aktivierten Anzeigepunkte AL bekannt sind, kann der jeweilige Ansteuerstrom und ein mit dem Stromaufnehmer S erfaßter Strom zur Lokalisierung des jeweiligen angesteuerten Anzeigepunktes AL herangezogen und bei Feststellen eines Fehlerstromes im Fehlerspeicher FSP mit einer entsprechenden Kennung hinterlegt werden. Bei einer Gruppe von Leuchtdioden L ist in der Steuereinheit auch die Information bekannt, wie hoch der jeweilige Ansteuerstrom sein muß, so daß durch Vergleich mit dem Rückmeldesignal des Stromaufnehmers L auch der Ausfall einzelner Leuchtdioden durch Vergleich mit dem jeweiligen Sollwert festgestellt werden kann. Bei einer Farbdarstellung, bei der die einzelnen Leuchtdioden pro Anzeigepunkt L entsprechend der darzustellenden Farbe angesteuert werden, kann auf diese Weise auf die richtige Farbdarstellung rückgeschlossen werden. Durch die aufeinanderfolgende Kontrolle aller Anzeigepunkte L ist damit eine vollständige Überwachung der Anzeigevorrichtung gegeben.The error detection in the control unit takes place in connection with that in the Control unit available control information of the individual display points L. The control of the display points L is row by row and column by column Multiplex operation carried out, with only one display module at a time one display point L, which may consist of several light-emitting diodes can exist, is controlled. The drive frequency is so high that the intermittent activation is not perceived by the eye, i.e. is above the flicker fusion frequency. The luminance of the display points L can be selected by means of pulse width modulation, whereby relatively high instantaneous luminance levels can be achieved by controlling the pulse width are. Since in the control unit ST the activation times of the respective activated display points AL are known, the respective drive current and a current sensed with the current collector S for localizing the the respective controlled display point AL and used when determining a fault current in the fault memory FSP with a corresponding identifier be deposited. With a group of light-emitting diodes L is in the control unit also the information known how high the respective control current must be, so that by comparison with the feedback signal of the current collector L also the failure of individual LEDs by comparison with the respective setpoint can be determined. In a color representation in which the individual LEDs per display point L according to the color to be displayed can be controlled, the correct color representation can be inferred in this way will. Through the sequential control of all display points L is thus a complete monitoring of the display device given.
In der Steuereinheit oder der übergeordneten Steuereinrichtung können in einer Auswerteeinheit die notwendigen Schlüsse für die Fehlerbehandlungen festgelegt werden. Es kann entschieden werden, ob eine Fehlermeldung bei Ausfall eines oder mehrerer Anzeigepunkte L erfolgen soll. Bei einer bestimmten einstellbaren Anzahl von fehlenden aktiven Anzeigepunkten AL kann die Anzeigevorrichtung wegen nicht mehr eindeutig erkennbaren Darstellungen (Verstümmelung) ausgeschaltet werden soll.In the control unit or the higher-level control device can in one Evaluation unit determines the necessary conclusions for error handling will. It can be decided whether an error message in the event of failure one or more display points L should take place. With a certain adjustable Number of missing active display points AL can the display device due to representations that are no longer clearly recognizable (mutilation) should be switched off.
Um die Funktionsüberwachung der Anzeigemodule noch zu verbessern, kann z.B. für eine Langzeitüberwachung der Leuchtdichte und/oder Farbwiedergabe ein Referenzelement RE vorgesehen sein; bei Abweichung von einem vorgebbaren Sollwert kann über die Steuereinheit bzw. Steuereinrichtung eine entsprechende Information zum Auswechseln des Anzeigemoduls ausgegeben werden. Ferner kann ein Temperatursensor TS an geeigneter Stelle vorgesehen sein, um z.B. eine Kühlvorrichtung zu aktivieren oder die Anzeigevorrichtung bei Gefahr abzuschalten.To further improve the function monitoring of the display modules, e.g. for long-term monitoring of luminance and / or color rendering a reference element RE can be provided; in the event of a deviation from a predefinable one The setpoint can be set via the control unit or control device appropriate information for replacing the display module is output will. Furthermore, a temperature sensor TS can be provided at a suitable point be e.g. to activate a cooling device or the display device at Danger of switching off.
Claims (7)
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DE19710855 | 1997-03-15 | ||
DE19710855A DE19710855A1 (en) | 1997-03-15 | 1997-03-15 | LED matrix display device |
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EP0866440A2 true EP0866440A2 (en) | 1998-09-23 |
EP0866440A3 EP0866440A3 (en) | 2001-02-07 |
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EP98102263A Expired - Lifetime EP0866440B1 (en) | 1997-03-15 | 1998-02-10 | LED matrix display |
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US (1) | US6486860B1 (en) |
EP (1) | EP0866440B1 (en) |
AT (1) | ATE278234T1 (en) |
DE (2) | DE19710855A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1306826A1 (en) * | 2000-07-28 | 2003-05-02 | Nichia Corporation | Drive circuit of display and display |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1025501B1 (en) * | 1997-10-29 | 2002-04-03 | Continental Teves AG & Co. oHG | Method and device for checking an error control procedure of a circuit |
DE19951348A1 (en) * | 1999-10-25 | 2001-05-31 | Dambach Werke Gmbh | Display device has display modules arranged in at least one column and/or at least one row with separate module housing accommodated in bearer structure, common control unit and supply |
DE10048440A1 (en) * | 2000-09-29 | 2002-04-25 | Siemens Ag | Display element and module for forming a display element consists of multiple optically coupled display modules set adjacent to each other. |
DE10121177A1 (en) | 2001-04-30 | 2002-11-14 | Aeg Ges Moderne Inf Sys Mbh | LCD cell |
DE10125673A1 (en) | 2001-05-25 | 2002-12-05 | Aeg Ges Moderne Inf Sys Mbh | LCD cell |
DE10158784B4 (en) * | 2001-11-30 | 2006-03-16 | Infineon Technologies Ag | A method for determining a distance of processor units to at least one reference position in a processor arrangement and processor arrangement |
EP1449110A2 (en) * | 2001-11-30 | 2004-08-25 | Infineon Technologies AG | Method for determination of a separation from processor units to at least one reference position in a processor arrangement and processor arrangement |
JP3866606B2 (en) * | 2002-04-08 | 2007-01-10 | Necエレクトロニクス株式会社 | Display device drive circuit and drive method thereof |
AU2003229382B2 (en) * | 2002-05-28 | 2008-07-10 | Compusign Pty Ltd | Array monitoring |
AUPS261402A0 (en) * | 2002-05-28 | 2002-06-20 | Compusign Pty Ltd | Array monitoring |
JP4001331B2 (en) * | 2002-06-27 | 2007-10-31 | 本田技研工業株式会社 | Engine starter |
JP3950845B2 (en) * | 2003-03-07 | 2007-08-01 | キヤノン株式会社 | Driving circuit and evaluation method thereof |
DE102004034761A1 (en) * | 2004-07-12 | 2006-02-02 | E.G.O. Elektro-Gerätebau GmbH | Cooking system for a glass ceramic hob comprises a display unit having a number of illuminating diodes in the form of a field, in which the field has more than two illuminating diodes in each direction |
CN100405072C (en) * | 2004-08-10 | 2008-07-23 | 康佳集团股份有限公司 | LED screen dead pixel detection method and circuit therefor |
DE102009042619B3 (en) * | 2009-09-23 | 2010-12-09 | Audi Ag | Display device for motor vehicle, has control equipment for providing pictures and for controlling pixel giver and collection unit coupled with control equipment |
US20110140992A1 (en) * | 2009-12-16 | 2011-06-16 | Isign Display Systems Llc (Hangzhou) | LED display |
CN101964166A (en) * | 2010-09-13 | 2011-02-02 | 南京通用电器有限公司 | Circuit for detecting dead pixel of LED display screen and method thereof |
DE102012212356A1 (en) * | 2012-07-13 | 2014-01-16 | Siemens Aktiengesellschaft | Method for displaying condition of electric lines of e.g. pilot relay, in electrical system, involves performing multiplex-like pressurizing of nearest lines from monitoring contacts after checking contacts actuated with output voltage |
CN113707569B (en) * | 2021-08-25 | 2024-02-09 | 厦门天马显示科技有限公司 | Display panel detection method and display panel |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2952009A1 (en) * | 1979-12-21 | 1981-07-09 | Günter Wulff-Apparatebau GmbH, 1000 Berlin | TEST CIRCUIT FOR OPTICAL INDICATORS |
DE3206123A1 (en) * | 1982-02-20 | 1983-09-01 | Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen | Method and circuit arrangement for checking and detecting errors during the operation of a multi-digit fluorescent display |
US4764728A (en) * | 1985-08-29 | 1988-08-16 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for detecting position of faulty light emitting element in large screen display system |
EP0295478A2 (en) * | 1987-06-03 | 1988-12-21 | Prisma Skyltreklam Ab | Electronic sign with a number of light bulbs provided in rows and columns |
GB2210720A (en) * | 1987-10-09 | 1989-06-14 | Eric Cheng | LED displays |
US5113134A (en) * | 1991-02-28 | 1992-05-12 | Thomson, S.A. | Integrated test circuit for display devices such as LCD's |
US5444390A (en) * | 1994-02-02 | 1995-08-22 | Texas Digital Systems, Inc. | Means and method for sequentially testing electrical components |
US5594463A (en) * | 1993-07-19 | 1997-01-14 | Pioneer Electronic Corporation | Driving circuit for display apparatus, and method of driving display apparatus |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3909788A (en) * | 1971-09-27 | 1975-09-30 | Litton Systems Inc | Driving circuits for light emitting diodes |
US4103299A (en) * | 1976-10-12 | 1978-07-25 | Cutler-Hammer, Inc. | Two-wire pilot device solid state control system |
DE2727800B2 (en) | 1977-06-21 | 1979-08-02 | Vogel & Halke, 2000 Hamburg | Circuit arrangement for operation and function error monitoring for LED displays |
DD252520A3 (en) | 1985-10-22 | 1987-12-23 | Radebeul Rapido Waegetechnik | CIRCUIT FOR VERIFYING AN LED DISPLAY |
US5122733A (en) * | 1986-01-15 | 1992-06-16 | Karel Havel | Variable color digital multimeter |
US5198803A (en) * | 1990-06-06 | 1993-03-30 | Opto Tech Corporation | Large scale movie display system with multiple gray levels |
DE4024499C1 (en) * | 1990-08-02 | 1991-09-26 | Dambach-Werke Gmbh, 7560 Gaggenau, De | |
GB9115402D0 (en) * | 1991-07-17 | 1991-09-04 | Philips Electronic Associated | Matrix display device and its method of operation |
DE4203276A1 (en) | 1991-09-19 | 1993-04-01 | Ronkholz Karl Heinz | Monitoring of information displayed by light-emitting diodes - registering data and control signals by groups of diodes through which current is assessed |
US5317307A (en) * | 1992-05-22 | 1994-05-31 | Intel Corporation | Method for pulse width modulation of LEDs with power demand load leveling |
JP3485654B2 (en) * | 1994-11-28 | 2004-01-13 | 三洋電機株式会社 | Display device adjustment method |
US5719589A (en) * | 1996-01-11 | 1998-02-17 | Motorola, Inc. | Organic light emitting diode array drive apparatus |
US5684368A (en) * | 1996-06-10 | 1997-11-04 | Motorola | Smart driver for an array of LEDs |
US5903246A (en) * | 1997-04-04 | 1999-05-11 | Sarnoff Corporation | Circuit and method for driving an organic light emitting diode (O-LED) display |
-
1997
- 1997-03-15 DE DE19710855A patent/DE19710855A1/en not_active Withdrawn
-
1998
- 1998-02-10 AT AT98102263T patent/ATE278234T1/en not_active IP Right Cessation
- 1998-02-10 DE DE59812012T patent/DE59812012D1/en not_active Expired - Fee Related
- 1998-02-10 EP EP98102263A patent/EP0866440B1/en not_active Expired - Lifetime
- 1998-03-06 US US09/036,386 patent/US6486860B1/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2952009A1 (en) * | 1979-12-21 | 1981-07-09 | Günter Wulff-Apparatebau GmbH, 1000 Berlin | TEST CIRCUIT FOR OPTICAL INDICATORS |
DE3206123A1 (en) * | 1982-02-20 | 1983-09-01 | Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen | Method and circuit arrangement for checking and detecting errors during the operation of a multi-digit fluorescent display |
US4764728A (en) * | 1985-08-29 | 1988-08-16 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for detecting position of faulty light emitting element in large screen display system |
EP0295478A2 (en) * | 1987-06-03 | 1988-12-21 | Prisma Skyltreklam Ab | Electronic sign with a number of light bulbs provided in rows and columns |
GB2210720A (en) * | 1987-10-09 | 1989-06-14 | Eric Cheng | LED displays |
US5113134A (en) * | 1991-02-28 | 1992-05-12 | Thomson, S.A. | Integrated test circuit for display devices such as LCD's |
US5594463A (en) * | 1993-07-19 | 1997-01-14 | Pioneer Electronic Corporation | Driving circuit for display apparatus, and method of driving display apparatus |
US5444390A (en) * | 1994-02-02 | 1995-08-22 | Texas Digital Systems, Inc. | Means and method for sequentially testing electrical components |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1306826A1 (en) * | 2000-07-28 | 2003-05-02 | Nichia Corporation | Drive circuit of display and display |
EP1306826A4 (en) * | 2000-07-28 | 2006-07-05 | Nichia Corp | Drive circuit of display and display |
Also Published As
Publication number | Publication date |
---|---|
DE59812012D1 (en) | 2004-11-04 |
EP0866440A3 (en) | 2001-02-07 |
EP0866440B1 (en) | 2004-09-29 |
ATE278234T1 (en) | 2004-10-15 |
US6486860B1 (en) | 2002-11-26 |
DE19710855A1 (en) | 1998-10-01 |
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