DE19923527A1 - Display device for characters and symbols using matrix of light emitters, excites emitters of mono colors in multiplex phases - Google Patents

Display device for characters and symbols using matrix of light emitters, excites emitters of mono colors in multiplex phases

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Publication number
DE19923527A1
DE19923527A1 DE19923527A DE19923527A DE19923527A1 DE 19923527 A1 DE19923527 A1 DE 19923527A1 DE 19923527 A DE19923527 A DE 19923527A DE 19923527 A DE19923527 A DE 19923527A DE 19923527 A1 DE19923527 A1 DE 19923527A1
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Germany
Prior art keywords
multiplex
phase
luminous elements
pixel
excited
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Ceased
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DE19923527A
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German (de)
Inventor
Alexander Boehlendorf
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LEUROCOM ELECTRONIC DISPLAYS GMBH, 71364 WINNENDEN
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LEUROCOM VISUELLE INFORMATIONS
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Priority to DE19923527A priority Critical patent/DE19923527A1/en
Publication of DE19923527A1 publication Critical patent/DE19923527A1/en
Ceased legal-status Critical Current

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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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • 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

Abstract

The light emitters are arranged in a rows and columns on a board to form a matrix. The emitters can be excited to emit light of different mono colors in the front beam. The light emitters of different mono colors are arranged in a geometrical combination to form a pixel. The emitters are excited by rows or columns alternately, while the adjacent column or row is dark. The emitters of a pixel are operated in multiplex, so that in each multiplex phase, at least one emitter of each pixel is excitable. In a first multiplex phase the emitters of a first mono color are excited, in a second multiplex phase the emitters of a second mono color are excited, and in an nth multiplex phase the emitters of an nth mono color are excited.

Description

Die Erfindung betrifft eine Vorrichtung zur Anzeige von Zeichen und Symbolen mit Leuchtkörpern gemäß Oberbegriff des Anspruches 1 bzw. 2.The invention relates to a device for displaying signs and symbols with luminous elements according to 2. The preamble of claim 1 and 2 respectively.

Solche Vorrichtungen sind bekannt, beispielsweise durch die deutsche Offenlegungsschrift 35 13 607 A1.Devices of this type are known, for example from German Offenlegungsschrift 35 13 607 A1.

Diese Anzeigevorrichtungen, welche z. B. Glühlampen oder Leuchtdioden als Licht- oder Leuchtkörper beinhalten, werden als Informationstableaus beispielsweise für Verkehrshinweise, Fahrpläne, Anzeigetafeln in Stadien und Arenen oder Hallen und dergleichen mehr verwendet.These display devices, which, for. B. incandescent lamps or light emitting diodes as light or luminous bodies include, are used as information boards for example for traffic information, timetables, scoreboards in Stadiums and arenas or halls and the like are used more.

Bei solchen Anzeigesystemen werden die einzelnen Bildpunkte durch ein Pixel, bestehend aus in der Regel 4 oder 5 verschieden farbig leuchtenden Leuchtkörpern realisiert. Stand der Technik ist dabei, daß man Rotlicht, grünes Licht und blaues Licht aussendende Leuchtkörper verwendet, die nach der Goetheschen Farbenlehre zusammen ein weißes Licht erzeugen. Bei Verwendung von Leuchtdioden als Leuchtkörper dominieren die aus zwei rot-, ein bis zwei grün- und einem blauen Leuchtdiodenkörper bestehenden Vierer- bzw. Fünferpixel.In such display systems, the individual pixels are usually composed of a pixel consisting of 4 or 5 different colored lights. State of the art is that one Red light, green light and blue light-emitting filament used according to the Goetheschen Color theory together create a white light. When using light emitting diodes as illuminants dominate the quadruple consisting of two red, one to two green and one blue LED body or five-pixel.

Bei Anzeigevorrichtungen mit relativ grobem Raster werden die Leuchtkörper meist einzeln angesteuert. Bei höherer Auflösung und damit kleinerem Raster werden die Pixel im Multiplexbetrieb angesteuert, d. h., daß die ungeraden Pixelspalten und die geraden Pixelspalten abwechselnd angesteuert werden bzw. dunkel gesteuert werden, so daß zu einem Zeitpunkt nur jede zweite Spalte der Anzeigenvorrichtung das entsprechende darzustellende Bild aufzeigt, während die jeweils andere Pixelspalte dunkel geschaltet ist.In the case of display devices with a relatively coarse grid, the luminous elements are usually controlled individually. With a higher resolution and thus a smaller grid, the pixels are driven in multiplex mode, i. H., that the odd pixel columns and the even pixel columns are driven alternately or dark are controlled so that only every second column of the display device at a time shows the corresponding image to be displayed while the other pixel column is switched dark.

Bekannt ist auch geworden das sog. Micromirrorprinzip bei kleinsten Farbbildschirmen in der Größenordnung von Zentimetern, wobei der Farbbildschirm aus einem Chip besteht, welches eine große Anzahl von Spiegelchen enthält, die elektrisch derart ansteuerbar sind, daß sie extern einfallendes Licht reflektieren oder nicht. Das extern einfallende Licht kann durch eine Art Nipkow-Scheibe mit Rot-, Grün- und Blaudurchlässigkeit der in Sektoren aufgeteilten sich drehenden Scheibe damit farbige oder schwarzweiße Bilder erzeugen.The so-called micromirror principle for the smallest color picture screens of the order of magnitude has also become known of centimeters, the color screen consisting of a chip which a large number of Contain mirrors that can be controlled electrically so that they reflect externally incident light or Not. The externally incident light can be through a kind of Nipkow disc with red, green and Blue permeability of the rotating disk, which is divided into sectors, is thus colored or black and white Create images.

Nachteilig ist bei den gemultiplexten Anzeigevorrichtungen gemäß dem Stande der Technik, daß sehr große Helligkeitsunterschiede auftreten, die durch das menschliche Auge stark wahrgenommen werden und als sehr empfindlich gelten. Durch das Multiplexen der einzelnen Pixelspalten erscheint dem Betrachter das Bild streifig; dieser Effekt tritt dann besonders stark auf, wenn sich der Betrachter bewegt oder wenn er mit dem Blick über die Anzeige streift. A disadvantage of the multiplexed display devices according to the prior art is that they are very large Differences in brightness occur that are strongly perceived by the human eye and as apply very sensitive. The image appears to the viewer by multiplexing the individual pixel columns streaky; this effect occurs particularly strongly when the viewer moves or when he is with the Glance over the display.  

Aufgabe der vorliegenden Erfindung war es deshalb, eine Vorrichtung der obengenannten Art anzugeben, welche beim Multiplexen größere Helligkeitsunterschiede vermeidet und damit eine bessere Bildqualität ermöglicht.The object of the present invention was therefore to provide a device of the type mentioned above, which avoids larger differences in brightness when multiplexing and thus better image quality enables.

Diese Aufgabe wurde mit den kennzeichnenden Merkmalen des Anspruches 1 bzw. 2 gelöst.This object was achieved with the characterizing features of claims 1 and 2, respectively.

Vorteilhafte Ausgestaltungen ergeben sich durch die Unteransprüche.Advantageous refinements result from the subclaims.

Die Vorteile der vorliegenden erfindungsgemäßen Anzeigevorrichtungen liegen darin, daß die Bildqualität wesentlich gesteigert wird, indem die Streifigkeit bzw. der Streifeneffekt eliminiert wird. Ein weiterer Vorteil liegt darin, daß der Bauteileaufwand durch das Multiplexverfahren nicht vergrößert, sondern beim drei- oder höherphasigen Multiplexen sogar noch verkleinert werden kann. Die Erfindung macht sich die Erkenntnis zu Nutze, daß das menschliche Auge für Farbschwankungen viel unempfindlicher ist als für Helligkeitsschwankungen, wodurch das Farbmultiplexen gemäß der Erfindung vom Betrachter nicht wahrgenommen werden kann. Außer den Einsparungen an Bauteilen wird durch das erfindungsgemäße Farbmultiplexen auch eine Reduzierung der internen Verbindungen im Display erzielt.The advantages of the present display devices according to the invention are that the image quality is significantly increased by eliminating the streakiness or the streak effect. Another advantage lies in the fact that the complexity of the components is not increased by the multiplex method, but in the three or higher-phase multiplexes can even be reduced. The invention adopts the knowledge Benefit that the human eye is much less sensitive to color fluctuations than to Brightness fluctuations, whereby the color multiplexing according to the invention is not by the viewer can be perceived. In addition to the savings on components, the invention Color multiplexing also achieved a reduction in the internal connections in the display.

Es folgt nun die Beschreibung der Erfindung anhand der Figuren.There now follows the description of the invention with reference to the figures.

Die Fig. 1 zeigt ein Zeitdiagramm des Multiplexbetriebes bzw. die Leuchtdiodenansteuerung eines Viererpixels gemäß Anspruch 5. Fig. 1 shows a timing chart of the multiplexing operation, and the LED driving a four-pixel according to claim 5.

In Fig. 2 ist ein Zeitdiagramm mit Farbmultiplexen aufgetragen, welches dem Anspruch 8 entspricht und auf der Ansteuerung von Pixeln mit fünf Leuchtdioden basiert.In FIG. 2 is a timing chart coated with color multiplexing corresponding to the claim 8 and based on the activation of pixels of five light emitting diodes.

In Fig. 1 unten ist die Ansteuerung eines solchen Pixels, welches aus zwei rot, einer grün und einer blauen Leuchtdiode besteht, über zwei Perioden T der Multiplexzeit aufgetragen bzw. durch Leuchtstrahlen erkennbar. Im darüberliegenden oberen Teil der Fig. 1 ist die Helligkeit entsprechend über der Multiplexzeit aufgetragen. In einer ersten Phase werden die beiden rotleuchtenden Leuchtdioden angesteuert, was zu einer Helligkeit von 30% führt. In einem zweiten Phasenteil der Multiplexzeit der Multiplexperiode wird eine Gründiode angesteuert, welche ca. 60% der Helligkeit liefert. Schließlich wird die Blaudiode in der dritten Phase der Multiplexzeit angesteuert, sie liefert 10% der Helligkeit. Dies wiederholt sich in den folgenden Perioden der Multiplexzeit. Aufgrund dieser Zusammensetzung der Einzelhelligkeiten der Rot-, Grün- und Blau- Leuchtdioden in einer Multiplexperiode ergibt sich 100% Weiß. Zwar schwankt damit bei einem weißen Bild die Helligkeit während einer solchen Multiplexperiode zwischen 10 und 60%, was zwar noch nicht optimal ist, aber optisch deutlich besser erscheint als das Multiplexen der Pixelspalten gemäß des Standes der Technik, wobei räumlich eine Helligkeitsschwankung von 100% auftritt.In FIG. 1 below, the control of such a pixel, which consists of two red, one green and one blue light-emitting diode, is plotted over two periods T of the multiplex time or can be recognized by light rays. In the upper part of FIG. 1 above, the brightness is correspondingly plotted over the multiplex time. In a first phase, the two red light-emitting diodes are activated, which leads to a brightness of 30%. In a second phase part of the multiplex time of the multiplex period, a green diode is driven, which supplies approximately 60% of the brightness. Finally, the blue diode is activated in the third phase of the multiplex time, it provides 10% of the brightness. This is repeated in the following periods of the multiplex time. This combination of the individual brightnesses of the red, green and blue LEDs in a multiplex period results in 100% white. Although the brightness of a white image fluctuates between 10 and 60% during such a multiplex period, which is not yet optimal, but appears optically significantly better than the multiplexing of the pixel columns according to the prior art, with a brightness fluctuation of 100% occurring spatially .

Die Fig. 2 zeigt unten die Ansteuerung von Pixeln mit fünf LED's aufgetragen über der Multiplexzeit von hier zwei Perioden T. In einer ersten Multiplexphase werden die beiden Rot-LED's angesteuert, was zu einer Helligkeit von 30% (siehe oben) führt. In einer zweiten Multiplexphase wird die eine Grün-LED zur Hälfte bestromt, sie erzeugt damit ebenfalls ca. 30% der Helligkeit, gleichzeitig wird auch eine Blauleuchtdiode erregt, welche mit ihren 10% eine Gesamthelligkeit in dieser Phase von 40% erzeugt. In einer dritten Phase wird die andere Grün-LED ebenfalls mit einer Halbbestromung erregt, wodurch sie ebenfalls etwa 30% der Helligkeit erzeugt. Damit ergibt sich eine weitere Verbesserung der Helligkeitsdifferenz von nur noch 10%. Eine weitere Halbierung des Helligkeitsunterschieds erreicht man beispielsweise dadurch, daß man in der zweiten Phase die grüne Leuchtdiode nur mit 25% beaufschlagt und daß man dafür die andere Gründiode in der dritten Phase mit 35% Helligkeitsstrom anregt. Dadurch ist die Helligkeit über zwei Multiplexphasen konstant und fällt nur in der dritten Phase um etwa 5% ab.The Fig. 2 below shows the addressed pixels with five LED's applied over the multiplex time from here two periods T. In a first multiplex phase, the two red LEDs are driven, resulting in a brightness of 30% (see above) leads. In a second multiplex phase, one of the green LEDs is energized in half, it also generates approx. 30% of the brightness, and at the same time a blue light-emitting diode is also excited, which with its 10% generates a total brightness of 40% in this phase. In a third phase, the other green LED is also energized with a half current, which also generates about 30% of the brightness. This results in a further improvement in the brightness difference of only 10%. A further halving of the difference in brightness is achieved, for example, by only applying 25% to the green light-emitting diode in the second phase and by exciting the other green diode in the third phase with 35% brightness current. As a result, the brightness is constant over two multiplex phases and only drops by about 5% in the third phase.

Claims (9)

1. Vorrichtung zur Anzeige von Zeichen und Symbolen mittels einer Vielzahl von Leuchtkörpern, die matrixförmig in Zeilen und Spalten auf einem Tableau angeordnet sind und zu einer in frontaler Richtungskeule in jeweils verschiedenen Monofarben erfolgenden Lichtabstrahlung erregbar sind, wobei die Leuchtkörper mit den verschiedenen Monofarben jeweils in einer geometrischen Kombination zu einem sog. Pixel angeordnet sind, wobei die Erregung der Leuchtkörper spalten- oder zeilenweise jeweils im Wechsel erfolgt, während die Leuchtkörper der benachbarten Spalten bzw. Zeilen dunkel gesteuert werden, dadurch gekennzeichnet, daß ein Multiplexbetrieb der Leuchtkörper eines Pixels derart erfolgt, daß in jeder Multiplexphase mindestens ein Leuchtkörper eines jeden Pixels erregbar ist, daß in einer ersten Multiplexphase die Leuchtkörper einer ersten Monofarbe, in einer zweiten Multiplexphase die Leuchtkörper einer zweiten Monofarbe und in einer 'nten Multiplexphase die Leuchtkörper einer 'nten Monofarbe erregbar sind.1.Device for displaying signs and symbols by means of a multiplicity of luminous elements which are arranged in a matrix in rows and columns on a tableau and can be excited to emit light in the front directional lobe in different mono colors, the luminous elements with the different mono colors in each case a geometric combination to form a so-called pixel, the excitation of the luminous elements being carried out alternately in columns or rows, while the luminous elements of the adjacent columns or rows are darkly controlled, characterized in that the luminous elements of a pixel are multiplexed in this way that in each multiplex phase at least one filament of each pixel can be excited, that in a first multiplex phase the filament of a first mono color, in a second multiplex phase the filament of a second mono color and in a 'nth multiplex phase the filament a 'nth mono color are excitable. 2. Vorrichtung zur Anzeige von Zeichen und Symbolen mittels einer Vielzahl von Leuchtkörpern, die matrixförmig in Zeilen und Spalten auf einem Tableau angeordnet sind und zu einer in frontaler Richtungskeule in jeweils verschiedenen Monofarben erfolgenden Lichtabstrahlung erregbar sind, wobei die Leuchtkörper mit den verschiedenen Monofarben jeweils in einer geometrischen Kombination zu einem sog. Pixel angeordnet sind, wobei die Erregung der Leuchtkörper spalten- oder zeilenweise jeweils im Wechsel erfolgt, während die Leuchtkörper der benachbarten Spalten bzw. Zeilen dunkel gesteuert werden, dadurch gekennzeichnet, daß ein Multiplexbetrieb der Leuchtkörper eines Pixels derart erfolgt, daß m Muitiplexphasen vorgesehen sind,
daß in jeder Multiplexphase mindestens ein Leuchtkörper eines jeden Pixels erregbar ist und
daß in jedem Multiplexzyklus jeder Leuchtkörper eines Pixels mindestens einmal erregbar ist.2.Device for displaying signs and symbols by means of a multiplicity of luminous elements which are arranged in a matrix in rows and columns on a tableau and can be excited to emit light in different mono colors in the frontal directional lobe, the luminous elements with the different mono colors in each case a geometric combination to form a so-called pixel, the excitation of the luminous elements being carried out alternately in columns or rows, while the luminous elements of the adjacent columns or rows are darkly controlled, characterized in that the luminous elements of a pixel are multiplexed in this way that m multiplex phases are provided,
that at least one luminous element of each pixel can be excited in each multiplex phase and
that each luminous element of a pixel can be excited at least once in each multiplex cycle. 3. Vorrichtung nach Anspruch 1 oder 2, gekennzeichnet durch die Verwendung von Leuchtdioden.3. Device according to claim 1 or 2, characterized by the use of light emitting diodes. 4. Vorrichtung nach einem der vorhergehenden Ansprüche, gekennzeichnet durch die Verwendung der Grundfarben rot, grün und blau als Monofarben.4. Device according to one of the preceding claims, characterized by the use of Basic colors red, green and blue as mono colors. 5. Vorrichtung nach Anspruch 1, 3 und 4, dadurch gekennzeichnet, daß n = 3 Multiplexphasen vorgesehen sind,
daß in einer ersten Multiplexphase zwei rotleuchtende Leuchtdioden,
in einer zweiten Multiplexphase eine grünleuchtende Leuchtdiode und
in einer dritten Multiplexphase eine blauleuchtende Leuchtdiode ansteuerbar sind (Fig. 1). 5. The device according to claim 1, 3 and 4, characterized in that n = 3 multiplex phases are provided,
that in a first multiplex phase two red light-emitting diodes,
in a second multiplex phase a green light emitting diode and
in a third multiplex phase, a blue light-emitting diode can be controlled ( FIG. 1). 6. Vorrichtung nach Anspruch 2, 3 und 4, dadurch gekennzeichnet, daß in min. einer der m Multiplexphasen gleichzeitig min. zwei Leuchtkörper derselben oder verschiedener Monofarbe ansteuerbar sind.6. The device according to claim 2, 3 and 4, characterized in that in min. one of the m Multiplex phases at the same time min. two lamps of the same or different mono color are controllable. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Leuchtkörper, mit unterschiedlicher Stromstärke ansteuerbar sind.7. The device according to claim 6, characterized in that the luminous body, with different Current strength can be controlled. 8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß m = n = 3 Multiplexphasen vorgesehen sind,
daß in einer ersten Multiplexphase zwei rotleuchtende Leuchtdioden,
daß in einer zweiten Multiplexphase eine grünleuchtende Leuchtdiode zur Hälfte der für Weiß benötigten Grünhelligkeiten und eine blauleuchtende Leuchtdiode und
daß in einer dritten Multiplexphase eine grünleuchtende Leuchtdiode zur Hälfte der für Weiß benötigten Grünhelligkeiten erregbar sind.8. The device according to claim 7, characterized in that m = n = 3 multiplex phases are provided,
that in a first multiplex phase two red light-emitting diodes,
that in a second multiplex phase a green light emitting diode is half of the green brightness required for white and a blue light emitting diode and
that in a third multiplex phase a green light emitting diode can be excited to half of the green brightness required for white. 9. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Leuchtkörper derart ansteuerbar sind, daß die durch das Multiplexen hervorgerufenen Helligkeitsunterschiede minimiert werden.9. The device according to claim 7, characterized in that the luminous elements can be controlled in such a way that the differences in brightness caused by the multiplexing are minimized.
DE19923527A 1999-05-21 1999-05-21 Display device for characters and symbols using matrix of light emitters, excites emitters of mono colors in multiplex phases Ceased DE19923527A1 (en)

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