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EP1099211B1 - Subframe-controlled image display device - Google Patents

Subframe-controlled image display device Download PDF

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Publication number
EP1099211B1
EP1099211B1 EP99932805A EP99932805A EP1099211B1 EP 1099211 B1 EP1099211 B1 EP 1099211B1 EP 99932805 A EP99932805 A EP 99932805A EP 99932805 A EP99932805 A EP 99932805A EP 1099211 B1 EP1099211 B1 EP 1099211B1
Authority
EP
European Patent Office
Prior art keywords
sequence
display device
pulse
width
picture display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99932805A
Other languages
German (de)
French (fr)
Other versions
EP1099211A1 (en
Inventor
Udo Fischbeck
Eckhard Guettner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundig Multimedia BV
Original Assignee
Grundig Multimedia BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE1998133597 external-priority patent/DE19833597A1/en
Priority claimed from DE19837307A external-priority patent/DE19837307A1/en
Application filed by Grundig Multimedia BV filed Critical Grundig Multimedia BV
Publication of EP1099211A1 publication Critical patent/EP1099211A1/en
Application granted granted Critical
Publication of EP1099211B1 publication Critical patent/EP1099211B1/en
Anticipated expiration legal-status Critical
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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2018Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/28Control 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
    • G09G3/2803Display of gradations
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0261Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0266Reduction of sub-frame artefacts
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2018Display of intermediate tones by time modulation using two or more time intervals
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2018Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/204Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames being organized in consecutive sub-frame groups

Definitions

  • the invention relates to a pulse width controlled image display device, in particular a plasma display, with control means for controlling a screen with the im Preamble of claim 1, 2 and 3 specified features. Furthermore, the Invention a method for controlling a pulse width controlled Image display device with those specified in the preamble of claim 12, 13 and 14 Features.
  • Such a method and such a device are included, for example Color plasma displays are used, which in future will be those of higher quality TVs currently in use will replace color picture tubes.
  • Color plasma displays are used, which in future will be those of higher quality TVs currently in use will replace color picture tubes.
  • the user of high quality televisions has been associated with color picture tubes At the end of the eighties due to the 100 Hz technology to a flicker-free Representation used.
  • Plasma display which consists of two glass plates arranged in a matrix There are electrodes between which there is an edefgas mixture.
  • the Image information is not displayed line by line in plasma displays as in Cathode steel tubes, but full frame.
  • matrix addressing Plasma displays do not individually switch the individual pixels on and off at any time can be switched off, the activation of the pixels for the whole Display done in one activation pass.
  • Controlling a plasma display consists of several phases: one Addressing or initializing, holding or activating and one Clearing phase.
  • the addressing or initialization phase all cells of the plasma display preloaded, which activates in the subsequent hold or activation phase should be.
  • the deletion phase the preloaded cells unloaded again, the image information is deleted.
  • the time interval available for displaying a television picture is shown in Part-time intervals of different durations are broken down during which, depending on the Brightness value of the respective pixel a predetermined activation sequence is chosen. This corresponds to one or more flashes of the respective one Pixel during the time interval available for image display, a predetermined period of time being assigned to each lighting up.
  • Such known plasma displays are used by the Fujitsu company, for example as a 42 "plasma display distributed on the market.
  • the object of the invention is a device and a method for controlling a Specify pulse width controlled image display device, which leads to an improved Play image.
  • the invention is based on the finding that it is slow when present moving or still images when displayed on a pulse width controlled display device for flickering, in particular in the 50 Hz range, although to display a full image in at a time interval of 20 msec, for example using 8 part-time intervals is 400 Hz. The same applies for systems in the 60 Hz range. Furthermore, the invention is based on a 50 Hz system.
  • Different grayscales are generated by a suitable one Selection of the activated part-time intervals.
  • the order of the Part-time intervals and / or their activation sequence selected so that a image display free of motion artifacts is achieved.
  • a Frame a time interval of 20 msec is provided and the Partial interval frequency is therefore 400 Hz.
  • the corresponding tasks provided by CRT televisions Deflection control takes place with the pulse width controlled Image display device in such a way that the control means for driving of the screen have a timing device, which vertical and Horizontal sync signals processed and the timing of the Pulse width modulator and a horizontal driver device of the Controls the plasma screen.
  • FIG. 1 shows a block diagram of a television receiver with a pulse width controlled plasma display.
  • the television receiver 1, 2 has a television signal processing part 1 and an image processing part 2.
  • the television signal processing part 1 has a first input 17 to which the signals are fed to an antenna device 19.
  • the signals of the Input 17 are to a high frequency and intermediate frequency processing unit 4 and an audio signal processing unit 3 forwarded.
  • a CVBS signal which is an analog / digital converter 5 is supplied.
  • the input of an external composite signal is possible via a second signal input 20.
  • the output signal of the Analog / digital converter 5 then becomes a so-called feature box 6 headed.
  • the feature box 6 performs certain functions such as Demodulation of the CVBS signal, still picture, zoom, format adjustment, Focus optimization, picture-in-picture, etc. by.
  • the resulting digital Components Y, U, V of an image signal 21 are connected to a digital one Matrix unit 8 of the image processing part 2 forwarded.
  • the Feature Box 6 also serves to convert the interlace signal into one interlaced signal and the necessary adaptation of the signals to the Screen 14 by line interpolation. This is done with the help of Synchronization signals 23, 24 for vertical and horizontal synchronization.
  • the digital matrix unit 8 also has a connection 27 Supply of a VGA signal supplied via an external signal input 18 which, by means of an analog / digital converter 25 into a digital Signal is converted.
  • A is located at the output of the digital matrix unit 8 RGB signal 22 with which the controller 10, 13 is controlled.
  • the Controller 10, 13 generates the control signals 26 for an address driver 11.
  • a memory 9 is provided with the controller 10, 13 for this signal generation coupled.
  • the controller 10, 13 has a part-time interval allocation unit to determine the order and duration of the part-time intervals.
  • the column driver device 11 controls the individual columns of the Plasma screen 14 on.
  • the associated time control is carried out using the Controller 10, 13, the start of the part-time intervals and the times for the Establishes addressing and activation phase. This is the purpose of the Time control included part-time interval line control device.
  • the Controller 10, 13 is connected to a horizontal driver 12. This Horizontal driver 12 is active during the activation phases.
  • the Power is supplied using a power supply 7.
  • the structure of the Image processing part 2 fundamentally different.
  • the main reason for this is all in that the plasma display device 14 has a digital Has relationship between the input variable and the luminance. There are therefore only two states: switched on or switched off.
  • the image processing part shown in Figure 1 2 uses a digital time division multiplex method for image display. at this the RGB signals 22 in several part-time intervals disassembled of different duration. This is done with the help of the controller 10, 13 and other units such as a memory 9.
  • the pulse width controlled image display device has a digital matrix (8) on which is provided for processing a digital image signal (21, 27) is and as the output signal that the pulse width modulator (10) Control means (10-13) supplied RGB signal.
  • the pulse width controlled image display device has a digital matrix (8) On, which are provided for processing a digital image signal (21, 27) is and as the output signal that the pulse width modulator (10) Control means (10-13) supplied RGB signal.
  • the controller 10, 13 of the image display device 2 controlled such that the order of the part-time intervals and their Activation sequence depending on the movement content of the image signal is changeable. In an operating state, it is faster when present Movements represent the correct movement on the screen represented signals and in an operating state with slow Movements a flicker-free image display.
  • Figure 2 shows a diagram of a part-time interval pattern, at which the displayed images are displayed correctly.
  • the Part-time groups TG1 and TG2 are characteristic of an image display.
  • the Image elements of the plasma display are one of the two part-time groups TG1 or assigned to TG2
  • the image is built up in several times successive part-time intervals t1 to t8.
  • Each one Luminance signal L assigned to the pixel results from the analog signal Brightness value over the activation scheme, according to Figure 2, and the resulting derived activation sequence.
  • the ratio of the shortest Activation duration is in a ratio to the longest activation duration from 1 to 12.
  • the number of generated in the part-time intervals t1 to t8 Activation time is that shown in Figure 2 Embodiment 12.
  • the number of part-time intervals t1 to t8 is 8.
  • the activation duration of the part-time groups TG1 and TG2 is identical.
  • the temporal length of the part-time intervals t1 to t8 is different, what in the Figure 2 by the indicated at the bottom of the diagram "Weighting factors" 12, 8, 4, 2 and 1 is expressed.
  • this pixel lights up during the part-time intervals t1, t2, t3, t7 and t8 of the part-time group TG1 and during the part-time intervals t1, t2, t6, t7 and t8 of the second part-time group TG2 and is the first during part-time intervals t4, t5 and t6 Part-time group TG1 and during the part-time intervals t3, t4 and t5 of the second Part-time group TG2 dark.
  • FIG. 3 shows a pattern belonging to the peak interval pattern of FIG. 2 Diagram illustrating a 50 Hz flicker as a function of Brightness H and the input signal level L
  • the course of the characteristic F the that characterizes 50 Hz flickering, shows in particular Input signal levels L> 30 an intensely occurring 50 Hz flickering.
  • the maximum is at one Input signal amplitude of 44 can be determined as flicker value Fm.
  • FIG. 4 shows the course of the average brightness Hm for a special one Input signal amplitude level of 44 as a function of time t From the sine or cosine-shaped brightness curve Hv is clearly the 50 Hz flicker disturbance recognizable.
  • FIG. 5 shows an optimized with respect to the 50 Hz flickering Part-time interval pattern.
  • the already in connection with figure 2 introduced reference numerals used.
  • the shown in Figure 5 Partial interval pattern points in contrast to that shown in Figure 2 Pattern a changed order of the part-time intervals t1 to t8. So is in the embodiment shown in Figure 5, the order of Weights 12, 4, 8.1, 2, 12, 4, 8, while the order of Weightings in the part-time interval pattern 12, 8, 4 shown in FIG. 2, 2, 1, 4, 8, 12.
  • the corresponding order of the part-time intervals 5 is t1, t3, t2, t5, t4, t8, t6, t7, while the order of Part-time intervals in Figure 2 is t1, t2, t3, t4, t5, t6, t7, t8.
  • FIG. 6 shows the simulation result for that shown in t5 Part-time interval pattern.
  • the already in connection with the Figure 3 introduced reference numerals used The simulation shows that the Partial interval pattern shown in Figure 5 to a significantly reduced 50th Hz flickering leads, especially at higher input signal levels.
  • the partial interval pattern according to FIG. 2 becomes moving image content used, with which less movement artifacts occur.
  • the television receiver shown in Figure 1 points as Part of the feature box 6 a motion detector 6a, the Output signals are supplied to the controller 10, 13.
  • FIG. 7 shows that the Memory 9, for example, two different memory areas 9a and 9b In each of these memory areas, data are stored that correspond to the correspond to the respective part-time interval pattern. Depending on the movement content of the The image that is detected by the motion detector 6a is addressed one of the two memory areas to the respective Read out data belonging to the part-time interval pattern.
  • An advantageous development of the invention consists, in addition to that already to provide further operating states in the two operating states mentioned, each of these additional operating states being a specific one
  • the movement content corresponds to 9 more Storage areas that contain data records for these other operating states contain.
  • the controller 10, 13 by a pulse width modulator 10 and a timing device 13 realized.

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

Description

Die Erfindung betrifft eine pulsbreitengesteuerte Bildanzeigevorrichtung, insbesondere ein Plasmadisplay, mit Ansteuermitteln zur Ansteuerung eines Bildschirms mit den im Oberbegriff des Anspruchs 1, 2 und 3 angegebenen Merkmalen. Weiterhin betrifft die Erfindung ein Verfahren zur Ansteuerung einer pulsbreitengesteuerten Bildanzeigevorrichtung mit den im Oberbegriff des Anspruchs 12, 13 und 14 angebenen Merkmalen.The invention relates to a pulse width controlled image display device, in particular a plasma display, with control means for controlling a screen with the im Preamble of claim 1, 2 and 3 specified features. Furthermore, the Invention a method for controlling a pulse width controlled Image display device with those specified in the preamble of claim 12, 13 and 14 Features.

Ein derartiges Verfahren und eine derartige Vorrichtung kommen beispielsweise bei Farbplasmadisplays zum Einsatz, welche in Zukunft die bei höherwertigen Fernsehgeräten derzeit noch verwendeten Farbbildröhren ersetzen werden. Im Zusammenhang mit Farbbildröhren ist der Benutzer hochwertiger Fernsehgeräte seit Ende der achtziger Jahre aufgrund der 100-Hz-Technologie an eine flackerfreie Darstellung gewöhnt.Such a method and such a device are included, for example Color plasma displays are used, which in future will be those of higher quality TVs currently in use will replace color picture tubes. in the The user of high quality televisions has been associated with color picture tubes At the end of the eighties due to the 100 Hz technology to a flicker-free Representation used.

Aus der Zeitschrift Radio Fernsehen Elektronik RFE, Heft 2, 1997, Seiten 18-20 ist ein Plasmadisplay bekannt, das aus zwei Glasplatten mit matrixartig angeordneten Elektroden besteht, zwischen denen sich ein Edefgasgemisch befindet. Die Bildinformation wird bei Plasmadisplays nicht zeilenweise dargestellt wie bei Kathodenstahlröhren, sondern vollbildweise. Da durch die Matrixadressierung eines Plasmadisplays die einzelnen Bildpunkte nicht zu beliebigen Zeiten einzeln ein- und ausgeschaltet werden können, muss die Aktivierung der Bildpunkte für das gesamte Display in einem Aktivierungsdurchgang erfolgen. From the magazine Radio Fernsehen Elektronik RFE, volume 2, 1997, pages 18-20 is a Plasma display known, which consists of two glass plates arranged in a matrix There are electrodes between which there is an edefgas mixture. The Image information is not displayed line by line in plasma displays as in Cathode steel tubes, but full frame. As a result of the matrix addressing Plasma displays do not individually switch the individual pixels on and off at any time can be switched off, the activation of the pixels for the whole Display done in one activation pass.

Die Ansteuerung eines Plasmadisplays besteht aus mehreren Phasen: einer Adressierungs- oder Initialisierungs-, einer Halte- oder Aktivierungs- und einer Löschphase.Controlling a plasma display consists of several phases: one Addressing or initializing, holding or activating and one Clearing phase.

In der Adressierungs- oder Initialisierungsphase werden alle Zellen des Plasmadisplays vorgeladen, welche in der darauf folgenden Halte- oder Aktivierungsphase aktiviert werden sollen. Im letzten Schritt, der Löschphase, werden die vorgeladenen Zellen wieder entladen, die Bildinformation wird gelöscht.In the addressing or initialization phase, all cells of the plasma display preloaded, which activates in the subsequent hold or activation phase should be. In the last step, the deletion phase, the preloaded cells unloaded again, the image information is deleted.

Das zur Darstellung eines Fernsehbildes zur Verfügung stehende Zeitintervall wird in Teilzeitintervalle unterschiedlicher Dauer zerlegt, während derer in Abhängigkeit vom Helligkeitswert des jeweiligen Bildpunktes eine vorgegebene Aktivierungssequenz gewählt wird. Dies entspricht einem ein- oder mehrmaligen Aufleuchten des jeweiligen Bildpunktes während des zur Bilddarstellung zur Verfügung stehenden Zeitintervalles, wobei jedem Aufleuchten eine vorgegebene Zeitdauer zugeordnet ist.The time interval available for displaying a television picture is shown in Part-time intervals of different durations are broken down during which, depending on the Brightness value of the respective pixel a predetermined activation sequence is chosen. This corresponds to one or more flashes of the respective one Pixel during the time interval available for image display, a predetermined period of time being assigned to each lighting up.

Derartige bekannte Plasmadisplays werden von der Firma Fujitsu beispielsweise als 42"-Plasmadisplay am Markt vertrieben.Such known plasma displays are used by the Fujitsu company, for example as a 42 "plasma display distributed on the market.

Aufgabe der Erfindung ist es, eine Vorrichtung und ein Verfahren zur Ansteuerung einer pulsbreitengesteuerten Bildanzeigevorrichtung anzugeben, welche zu einer verbesserten Bildwiedergabe führen.The object of the invention is a device and a method for controlling a Specify pulse width controlled image display device, which leads to an improved Play image.

Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Anspruchs 1, 2, 3 und ein Verfahren mit den Merkmalen des Anspruchs 12, 13, 14 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen angegeben. This object is achieved by a device having the features of claims 1, 2, 3 and a method having the features of claims 12, 13, 14 solved. advantageous Embodiments of the invention are specified in the dependent claims.

Der Erfindung liegt die Erkenntnis zugrunde, daß es beim Vorliegen langsam bewegter oder stillstehender Bilder bei deren Darstellung auf einer pulsbreitengesteuerten Anzeigevorrichtung zu einem Flackern, insbesondere im 50 Hz-Bereich, kommen kann, obwohl zur Darstellung eines Vollbildes in einem Zeitintervall von 20 msec die Teilzeitintervallfrequenz zum Beispiel bei der Verwendung von 8 Teilzeitintervallen 400 Hz beträgt. Ähnliches gilt auch bei Systemen im 60 Hz-Bereich. Im weiteren wird die Erfindung anhand eines 50 Hz-Systems beschrieben.The invention is based on the finding that it is slow when present moving or still images when displayed on a pulse width controlled display device for flickering, in particular in the 50 Hz range, although to display a full image in at a time interval of 20 msec, for example using 8 part-time intervals is 400 Hz. The same applies for systems in the 60 Hz range. Furthermore, the invention is based on a 50 Hz system.

Simulationen haben bestätigt, daß ein derartiges Flackern, welches insbesondere bei langsam bewegten Bildern festzustellen ist, dadurch vermindert werden kann, daß die Reihenfolge der Teilzeitintervalle und/oder deren Aktivierungssequenz in einer bestimmten Weise variiert werden. Eine derartige Variation zielt darauf ab, das Flackern der auf dem Bildschirm darzustellenden Bilder zu minimieren.Simulations have confirmed that such flickering, which this is particularly noticeable with slow moving images can be reduced that the order of the part-time intervals and / or whose activation sequence can be varied in a certain way. A such variation aims at the flickering of the on-screen minimize images to be displayed.

Zur Erzielung einer möglichst flackerfreien Darstellung hat es sich als vorteilhaft erwiesen, die Aktivierung der Teilzeitintervalle im wesentlichen gleichmäßig zu verteilen.To achieve a flicker-free display, it has proven to be proved to be advantageous in activating the part-time intervals essentially to distribute evenly.

Eine Erzeugung verschiedener Graustufen erfolgt durch eine geeignete Auswahl der aktivierten Teilzeitintervalle.Different grayscales are generated by a suitable one Selection of the activated part-time intervals.

Beim Vorliegen schnell bewegter Bilder wird die Reihenfolge der Teilzeitintervalle und/oder deren Aktivierungssequenz so gewählt, daß eine von Bewegungsartefakten freie Bilddarstellung erreicht wird.If fast moving images are available, the order of the Part-time intervals and / or their activation sequence selected so that a image display free of motion artifacts is achieved.

Bei praktischen Anwendungen hat es sich zur Zeit als vorteilhaft gezeigt, das Verhältnis der kürzesten zur längsten Aktivierungsdauer auf 1 : 12 zu legen. Die Anzahl der Teilzeitintervalle ist auf 8 festgelegt. Die Teilzeitintervalle werden in zwei Teilzeitgruppen aufgeteilt. In practical applications it has currently been shown to be advantageous Set the ratio of the shortest to the longest activation period to 1:12. The number of part-time intervals is fixed at 8. The part-time intervals are divided into two part-time groups.

Bei einer bevorzugten Ausführungsform der Erfindung ist zur Darstellung eines Vollbildes ein Zeitintervall von 20 msec vorgesehen und die Teilzeitintervallfrequenz beträgt folglich 400 Hz.In a preferred embodiment of the invention, a Frame a time interval of 20 msec is provided and the Partial interval frequency is therefore 400 Hz.

Die entsprechenden Aufgaben der bei Bildröhrenfernsehgeräten vorgesehenen Ablenksteuerung erfolgen bei der pulsbreitengesteuerten Bildanzeigevorrichtung in der Weise, daß die Ansteuermittel zur Ansteuerung des Bildschirms eine Zeitensteuereinrichtung aufweisen, welche Vertikal- und Horizontalsynchronsignale verarbeitet und die Zeitensteuerung des Pulsbreitenmodulators sowie eine Horizontaltreibereinrichtung des Plasmabildschirm ansteuert.The corresponding tasks provided by CRT televisions Deflection control takes place with the pulse width controlled Image display device in such a way that the control means for driving of the screen have a timing device, which vertical and Horizontal sync signals processed and the timing of the Pulse width modulator and a horizontal driver device of the Controls the plasma screen.

Im folgenden wird die Erfindung anhand der in den Figuren dargestellten Ausführungsbeispiele näher beschrieben und erläutert.In the following, the invention will be described with reference to the figures Exemplary embodiments described and explained in more detail.

Es zeigen:

Figur 1
ein Blockschaltbild eines Fernsehempfängers mit einer pulsbreitengesteuerten Plasmadisplayanzeige,
Figur 2
eine Darstellung eines ersten Teilzeitintervallmusters,
Figur 3
ein zu dem Teilzeitintervallmuster von Figur 2 gehöriges Diagramm zur Veranschaulichung des 50 Hz-Flackerns,
Figur 4
ein Diagramm zur Veranschaulichung der Helligkeitsverteilung während einer Vollbildperiode für einen speziellen Eingangssignalpegel, bei welchem starkes 50 Hz-Flackern auftritt,
Figur 5
ein optimiertes Teilzeitintervallmuster, bei welchem das 50 Hz-Flackern reduziert ist,
Figur 6
ein zu dem Teilzeitintervallmuster von Figur 5 gehöriges Diagramm zur Veranschaulichung des reduzierten 50 Hz-Flackerns,
Figur 7
ein Diagramm zur Veranschaulichung der bewegungsdetektorabhängigen Betriebsartumschaltung mit z.B. zwei Betriebszuständen.
Show it:
Figure 1
2 shows a block diagram of a television receiver with a pulse-width-controlled plasma display,
Figure 2
a representation of a first part-time interval pattern,
Figure 3
3 shows a diagram belonging to the part-time interval pattern from FIG. 2 to illustrate the 50 Hz flickering,
Figure 4
1 shows a diagram to illustrate the brightness distribution during a frame period for a special input signal level at which a strong 50 Hz flickering occurs,
Figure 5
an optimized part-time interval pattern in which the 50 Hz flickering is reduced,
Figure 6
5 shows a diagram belonging to the part-time interval pattern of FIG. 5 to illustrate the reduced 50 Hz flickering,
Figure 7
a diagram to illustrate the motion detector-dependent mode switching with, for example, two operating states.

Die Figur 1 zeigt ein Blockschaltbild eines Fernsehempfängers mit einer pulsbreitengesteuerten Plasmadisplayanzeige. Der Fernsehempfänger 1, 2 weist ein Fernsehsignalverarbeitungsteil 1 und ein Bildverarbeitungsteil 2 auf. Der Fernsehsignalverarbeitungsteil 1 weist einen ersten Eingang 17 auf, dem die Signale einer Antenneneinrichtung 19 zugeführt werden. Die Signale des Eingangs 17 werden an eine Hochfrequenz- und Zwischenfrequenz-Verarbeitungseinheit 4 sowie eine Audiosignalverarbeitungseinheit 3 weitergeleitet. Am Ausgang der Hochfrequenz- und Zwischenfrequenz-Verarbeitungseinheit 4 liegt ein FBAS-Signal vor, welches einem Analog-/Digitalwandler 5 zugeführt wird. Die Einspeisung eines externen FBAS-Signals ist über einen zweiten Signaleingang 20 möglich. Das Ausgangssignal des Analog-/Digitalwandlers 5 wird anschließend zu einer sogenannten Feature-Box 6 geleitet. Die Feature-Box 6 führt bestimmte Funktionen wie Demodulation des FBAS-Signals, Standbild, Zoom, Formatanpassung, Bildschärfeoptimierung, Bild-in-Bild, etc. durch. Die so entstehenden digitalen Komponenten Y, U, V eines Bildsignals 21 werden an eine digitale Matrixeinheit 8 des Bildverarbeitungsteils 2 weitergeleitet. Die Feature-Box 6 dient darüber hinaus der Wandlung des Zeilensprungsignals in ein zeilensprungfreies Signal und der notwendigen Anpassung der Signale an den Bildschirm 14 durch Zeileninterpolation. Dies erfolgt mit Hilfe der Synchronisationssignale 23, 24 zur Vertikal- und Horizontalsynchronisation. Figure 1 shows a block diagram of a television receiver with a pulse width controlled plasma display. The television receiver 1, 2 has a television signal processing part 1 and an image processing part 2. The television signal processing part 1 has a first input 17 to which the signals are fed to an antenna device 19. The signals of the Input 17 are to a high frequency and intermediate frequency processing unit 4 and an audio signal processing unit 3 forwarded. At the output of the high frequency and intermediate frequency processing unit 4 is a CVBS signal, which is an analog / digital converter 5 is supplied. The input of an external composite signal is possible via a second signal input 20. The output signal of the Analog / digital converter 5 then becomes a so-called feature box 6 headed. The feature box 6 performs certain functions such as Demodulation of the CVBS signal, still picture, zoom, format adjustment, Focus optimization, picture-in-picture, etc. by. The resulting digital Components Y, U, V of an image signal 21 are connected to a digital one Matrix unit 8 of the image processing part 2 forwarded. The Feature Box 6 also serves to convert the interlace signal into one interlaced signal and the necessary adaptation of the signals to the Screen 14 by line interpolation. This is done with the help of Synchronization signals 23, 24 for vertical and horizontal synchronization.

Die digitale Matrixeinheit 8 weist darüber hinaus einen Anschluß 27 zur Zuführung eines über einen externen Signaleingang 18 zugeführten VGA-Signals auf, welches mittels eines Analog-/Digitalwandlers 25 in ein digitales Signal umgewandelt wird. Am Ausgang der digitalen Matrixeinheit 8 liegt ein RGB-Signal 22 vor, mit welchem der Controller 10, 13 angesteuert wird. Der Controller 10, 13 erzeugt die Ansteuersignale 26 für einen Adresstreiber 11. Für diese Signalerzeugung ist mit dem Controller 10, 13 ein Speicher 9 gekoppelt. Der Controller 10, 13 weist eine Teilzeitintervallzuordnungseinheit auf, die Festlegung der Reihenfolge und Dauer der Teilzeitintervalle dient.The digital matrix unit 8 also has a connection 27 Supply of a VGA signal supplied via an external signal input 18 which, by means of an analog / digital converter 25 into a digital Signal is converted. A is located at the output of the digital matrix unit 8 RGB signal 22 with which the controller 10, 13 is controlled. The Controller 10, 13 generates the control signals 26 for an address driver 11. A memory 9 is provided with the controller 10, 13 for this signal generation coupled. The controller 10, 13 has a part-time interval allocation unit to determine the order and duration of the part-time intervals.

Die Spaltentreibereinrichtung 11 steuert die einzelnen Spalten des Plasmabildschirms 14 an. Die zugehörige Zeitensteuerung erfolgt mit Hilfe des Controller 10, 13, der den Beginn der Teilzeitintervalle und die Zeiten für die Adressier- und Aktivierungsphase festlegt. Hierzu dient die in der Zeitensteuerung enthaltene Teilzeitintervallzeilensteuereinrichtung. Der Controller 10, 13 ist mit einem Horizontaltreiber 12 verbunden. Dieser Horizontaltreiber 12 ist während der Aktivierungsphasen aktiv. Die Spannungsversorgung erfolgt mit Hilfe eines Netzteils 7.The column driver device 11 controls the individual columns of the Plasma screen 14 on. The associated time control is carried out using the Controller 10, 13, the start of the part-time intervals and the times for the Establishes addressing and activation phase. This is the purpose of the Time control included part-time interval line control device. The Controller 10, 13 is connected to a horizontal driver 12. This Horizontal driver 12 is active during the activation phases. The Power is supplied using a power supply 7.

Während die Funktionsweise und der Aufbau des Fernsehsignalverarbeitungsteils 1 im wesentlichen dem eines konventionellen Fernsehempfängers mit Bildröhre entspricht, ist der Aufbau des Bildverarbeitungsteils 2 grundverschieden. Der Hauptgrund hierfür liegt vor allem darin, daß die Plasmaanzeigeeinrichtung 14 einen digitalen Zusammenhang zwischen der Eingangsgröße und der Leuchtdichte aufweist. Es existieren somit lediglich zwei Zustände: eingeschaltet oder ausgeschaltet. Um dennoch eine große Palette von verschiedenen Zwischengraustufen erzielen zu können, wird bei dem in Figur 1 dargestellten Bildverarbeitungsteil 2 zur Bilddarstellung ein digitales Zeitmultiplexverfahren verwendet. Bei diesem werden die RGB-Signale 22 in mehrere Teilzeitintervalle unterschiedlicher Dauer zerlegt. Dies erfolgt mit Hilfe des Controller 10, 13 sowie weiteren Einheiten wie eines Speichers 9. Durch die Trägheit des menschlichen Auges erscheinen auf der Plasmaanzeigeeinrichtung 14 nicht mehr einzelne Bildwechsel, sondern ein Grauwert, der von der mittleren Aktivierungsdauer abhängt. Ist diese Dauer in den Teilzeitintervallen gewichtet, dann können mit wenigen Teilzeitintervallen viele Graustufen dargestellt werden. Bei einer binären Gewichtung 1,2,4,8,... können zwei potenziert mit der Anzahl der Teilzeitintervalle Graustufen dargestellt werden. Um möglichst viele Graustufen darstellen zu können, ist es somit wünschenswert, möglichst viele Teilzeitintervalle zu verwenden, was allerdings aufgrund technologischer Randbedingungen nicht möglich ist Der Controller 10, 13 bestimmt durch eine Zuordnung, die von seinem Eingangssignalpegel abhängig ist, die Reihenfolge und Aktivierung der einzelnen Teilzeitintervalle. Im Falle einer binären Gewichtung sieht diese Zuordnung derart aus, daß dem digital höchstgewichteten Bit das längste Teilzeitintervall, dem zweithöchstgewichteten Bit das zweitlängste Teilzeitintervall usw. zugewiesen wird.While the operation and structure of the Television signal processing part 1 essentially that of a conventional one Corresponds to television receiver with picture tube, is the structure of the Image processing part 2 fundamentally different. The main reason for this is all in that the plasma display device 14 has a digital Has relationship between the input variable and the luminance. There are therefore only two states: switched on or switched off. To nevertheless a wide range of different intermediate gray levels To achieve, is in the image processing part shown in Figure 1 2 uses a digital time division multiplex method for image display. at this the RGB signals 22 in several part-time intervals disassembled of different duration. This is done with the help of the controller 10, 13 and other units such as a memory 9. Due to the inertia of the human eye do not appear on the plasma display device 14 more individual image changes, but a gray value that of the middle Activation time depends. Is this duration in the part-time intervals weighted, then many gray levels can be achieved with a few part-time intervals being represented. With a binary weighting 1,2,4,8, ... two can exponentiated with the number of part-time intervals grayscale. In order to be able to display as many gray levels as possible, it is desirable to use as many part-time intervals as possible, which is The controller is not possible due to technological constraints 10, 13 determined by an assignment based on its input signal level depends on the order and activation of the individual part-time intervals. In the case of a binary weighting, this assignment looks such that the digitally weighted bit the longest part-time interval, the assigned the second longest part-time interval etc. becomes.

Die pulsbreitengesteuerte Bildanzeigevorrichtung weist eine digitale Matrix (8) auf, welche zur Verarbeitung eines digitalen Bildsignals (21, 27) vorgesehen ist und als Ausgangssignal das dem Pulsbreitenmodulator (10) der Ansteuermittel (10-13) zugeführte RGB-Signal liefert.The pulse width controlled image display device has a digital matrix (8) on which is provided for processing a digital image signal (21, 27) is and as the output signal that the pulse width modulator (10) Control means (10-13) supplied RGB signal.

Simulationen und subjektive Betrachtungen haben gezeigt, daß trotz einer Teifzeüintervallfrequenz von 400 Hz Flackerartefakte von 50 Hz, insbesondere ab mittleren Leuchtdichten, störend auftreten können. Die Auffälligkeit des 50 Hz-Flackems variiert dabei mit der darzustellenden Leuchtdichte und hängt vom Leuchtdichtelevel des jeweils aktivierten Teilzeitintervalls sowie von der Reihenfolge der Teilzeitintervalle innerhalb der 20 msec Rahmenperiode ab. Simulations and subjective considerations have shown that despite one Partial interval frequency of 400 Hz flicker artifacts of 50 Hz, in particular from medium luminance, can be disruptive. The conspicuousness of the 50th Hz flickers vary with the luminance to be displayed and depend the luminance level of the activated part-time interval and the Sequence of part-time intervals within the 20 msec frame period.

Die pulsbreitengesteuerte Bildanzeigevorrichtung weist eine digitale Matrix (8) auf, Welche zur Verarbeitung eines digitalen Bildsignals (21, 27) vorgesehen ist und als Ausgangssignal das dem Pulsbreitenmodulator (10) der Ansteuermittel (10-13) zugeführte RGB-Signal liefert. The pulse width controlled image display device has a digital matrix (8) On, which are provided for processing a digital image signal (21, 27) is and as the output signal that the pulse width modulator (10) Control means (10-13) supplied RGB signal.

Aus diesem Grund wird der Controller 10,13 der Bildanzeigevorrichtung 2 derart angesteuert, daß die Reihenfolge der Teilzeitintervalle und ihre Aktivierungssequenz in Abhängigkeit vom Bewegungsinhalt des Bildsignals veränderbar ist. In einem Betriebszustand erfolgt beim Vorliegen schneller Bewegungen eine bewegungsrichtige Darstellung der auf dem Bildschirm dargestellten Signale und in einem Betriebszustand mit langsamen Bewegungen eine flackerfreie Bilddarstellung.For this reason, the controller 10, 13 of the image display device 2 controlled such that the order of the part-time intervals and their Activation sequence depending on the movement content of the image signal is changeable. In an operating state, it is faster when present Movements represent the correct movement on the screen represented signals and in an operating state with slow Movements a flicker-free image display.

Figur 2 zeigt eine Diagrammdarstellung eines Teilzeitintervallmusters, bei welchem die dargestellten Bilder bewegungsrichtig dargestellt werden. Dabei ist mit dem Buchstaben L der Leuchtdichteeingangspegel des in Figur 1 mit der Bezugszahl 22 bezeichneten RGB-Signals gekennzeichnet. Die Teilzeitgruppen TG1 und TG2 sind für eine Bilddarstellung kennzeichnend. Die Bildelemente des Plasmadisplays sind einer der beiden Teilzeitgruppen TG1 oder TG2 zugeordnet Der Bildaufbau erfolgt jeweils in mehreren zeitlich aufeinanderfolgenden Teilzeitintervallen t1 bis t8. Das einem jeweiligen Bildpunkt zugeordnete Leuchtdichtesignal L ergibt sich aus dem analogen Helligkeitswert über das Aktivierungsschema, gemäß Figur 2, und der daraus abgeleiteten Aktivierungssequenz. Das Verhältnis der kürzesten Aktivierungsdauer zur längsten Aktivierungsdauer steht in einem Verhältnis von 1 zu 12. Die Anzahl der in den Teilzeitintervallen t1 bis t8 erzeugten Aktivierungsdauem beträgt bei dem in Figur 2 dargestellten Ausführungsbeispiel 12. Die Anzahl der Teilzeitintervalle t1 bis t8 beträgt 8. Die Aktivierungsdauer der Teilzeitgruppen TG1 und TG2 ist identisch.Figure 2 shows a diagram of a part-time interval pattern, at which the displayed images are displayed correctly. there with the letter L is the luminance input level of in FIG the RGB signal designated by the reference number 22. The Part-time groups TG1 and TG2 are characteristic of an image display. The Image elements of the plasma display are one of the two part-time groups TG1 or assigned to TG2 The image is built up in several times successive part-time intervals t1 to t8. Each one Luminance signal L assigned to the pixel results from the analog signal Brightness value over the activation scheme, according to Figure 2, and the resulting derived activation sequence. The ratio of the shortest Activation duration is in a ratio to the longest activation duration from 1 to 12. The number of generated in the part-time intervals t1 to t8 Activation time is that shown in Figure 2 Embodiment 12. The number of part-time intervals t1 to t8 is 8. The activation duration of the part-time groups TG1 and TG2 is identical.

Die zeitliche Länge der Teilzeitintervalle t1 bis t8 ist unterschiedlich, was in der Figur 2 durch die an der Unterseite des Diagramms angegebenen "Gewichtungsfaktoren" 12, 8, 4, 2 und 1 zum Ausdruck kommt. The temporal length of the part-time intervals t1 to t8 is different, what in the Figure 2 by the indicated at the bottom of the diagram "Weighting factors" 12, 8, 4, 2 and 1 is expressed.

Weist beispielsweise der einem Bildpunkt des Plasmadisplays 14 zugeordnete Leuchtdichteeingangspegel L den Wert 44 auf, dann leuchtet dieser Bildpunkt während der Teilzeitintervalle t1, t2, t3, t7 und t8 der Teilzeitgruppe TG1 und während der Teilzeitintervalle t1, t2, t6, t7 und t8 der zweiten Teilzeitgruppe TG2 auf und ist während der Teilzeitintervalle t4, t5 und t6 der ersten Teilzeitgruppe TG1 und während der Teilzeitintervalle t3, t4 und t5 der zweiten Teilzeitgruppe TG2 dunkel.For example, the one assigned to a pixel of the plasma display 14 Luminance input level L to 44, then this pixel lights up during the part-time intervals t1, t2, t3, t7 and t8 of the part-time group TG1 and during the part-time intervals t1, t2, t6, t7 and t8 of the second part-time group TG2 and is the first during part-time intervals t4, t5 and t6 Part-time group TG1 and during the part-time intervals t3, t4 and t5 of the second Part-time group TG2 dark.

Die Figur 3 zeigt ein zum Teitzefintervallmuster von Figur 2 zugehöriges Diagramm zur Veranschaulichung eines 50 Hz-Flackerns als Funktion der Helligkeit H und des Eingangssignalpegels L Der Verlauf der Kennlinie F, die das 50 Hz-Flackem kennzeichnet, zeigt insbesondere bei Eingangssignalpegeln L > 30 ein verstärkt auftretendes 50 Hz-Flackern. Ein Maximum ist aufgrund dieses Simulationsergebnisses bei einer Eingangssignalamplitude von 44 als Flackerwert Fm feststellbar.FIG. 3 shows a pattern belonging to the peak interval pattern of FIG. 2 Diagram illustrating a 50 Hz flicker as a function of Brightness H and the input signal level L The course of the characteristic F, the that characterizes 50 Hz flickering, shows in particular Input signal levels L> 30 an intensely occurring 50 Hz flickering. On Due to this simulation result, the maximum is at one Input signal amplitude of 44 can be determined as flicker value Fm.

Die Figur 4 zeigt den Verlauf der mittleren Helligkeit Hm für einen speziellen Eingangssignalamplitudenpegel von 44 als Funktion der Zeit t Aus dem sinus- bzw. cosinusförmigen Helligkeitsverlauf Hv ist deutlich die 50 Hz-Flackerstörung erkennbar.FIG. 4 shows the course of the average brightness Hm for a special one Input signal amplitude level of 44 as a function of time t From the sine or cosine-shaped brightness curve Hv is clearly the 50 Hz flicker disturbance recognizable.

Die Figur 5 zeigt ein in Bezug auf das 50 Hz-Flackern optimiertes Teilzeitintervallmuster. Dabei werden die bereits im Zusammenhang mit Figur 2 eingeführten Bezugszeichen verwendet. Das in Figur 5 dargestellte Teilzeitintervallmuster weist im Gegensatz zu dem im Figur 2 dargestellten Muster eine veränderte Reihenfolge der Teilzeitintervalle t1 bis t8 auf. So ist bei dem in Figur 5 dargestellten Ausführungsbeispiel die Reihenfolge der Gewichtungen 12, 4, 8,1, 2, 12, 4, 8, während die Reihenfolge der Gewichtungen bei dem im Figur 2 dargestellten Teilzeitintervallmuster 12,8,4, 2, 1, 4, 8, 12 beträgt. Die entsprechende Reihenfolge der Teilzeitintervalle lautet bei Figur 5 t1, t3, t2, t5, t4, t8, t6, t7, während die Reihenfolge der Teilzeitintervalle bei Figur 2 t1, t2, t3, t4, t5, t6, t7, t8 lautet.FIG. 5 shows an optimized with respect to the 50 Hz flickering Part-time interval pattern. The already in connection with figure 2 introduced reference numerals used. The shown in Figure 5 Partial interval pattern points in contrast to that shown in Figure 2 Pattern a changed order of the part-time intervals t1 to t8. So is in the embodiment shown in Figure 5, the order of Weights 12, 4, 8.1, 2, 12, 4, 8, while the order of Weightings in the part-time interval pattern 12, 8, 4 shown in FIG. 2, 2, 1, 4, 8, 12. The corresponding order of the part-time intervals 5 is t1, t3, t2, t5, t4, t8, t6, t7, while the order of Part-time intervals in Figure 2 is t1, t2, t3, t4, t5, t6, t7, t8.

Die Figur 6 zeigt das Simulationsergebnis zu dem in t5 dargestellten Teilzeitintervallmuster. Dabei werden die bereits im Zusammenhang mit der Figur 3 eingeführten Bezugszeichen verwendet Die Simulation zeigt, daß das in Figur 5 dargestellte Teilzeitintervallmuster zu einem deutlich reduzierten 50 Hz-Flackern führt, insbesondere bei höheren Eingangssignalpegeln.FIG. 6 shows the simulation result for that shown in t5 Part-time interval pattern. The already in connection with the Figure 3 introduced reference numerals used The simulation shows that the Partial interval pattern shown in Figure 5 to a significantly reduced 50th Hz flickering leads, especially at higher input signal levels.

Da das genannte 50 Hz-Flackern lediglich bei stehenden oder langsam bewegten Bildinhalten störend in Erscheinung tritt, wird gemäß der Erfindung lediglich bei stehenden oder langsam bewegten Bildinhalten von dem Teilzeitintervallmuster gemäß Figur 5 Gebrauch gemacht. Bei schnell bewegten Bildinhalten wird hingegen das Teilzeüintervaltrnuster gemäß Figur 2 verwendet, bei welchem geringere Bewegungsartefakte auftreten.Since the 50 Hz flicker mentioned only when standing or slow moving picture content appears disruptive, according to the invention only with standing or slowly moving picture content of the Part time interval pattern according to Figure 5 made use of. At quick On the other hand, the partial interval pattern according to FIG. 2 becomes moving image content used, with which less movement artifacts occur.

Zu diesem Zweck weist der in Figur 1 dargestellte Fernsehempfänger als Bestandteil der Feature-Box 6 einen Bewegungsdetektor 6a auf, dessen Ausgangssignale dem Controller 10, 13 zugeführt werden. Dieser gibt in einem ersten Betriebszustand beim Vorliegen stillstehender oder langsam bewegter Bilder die Reihenfolge der Teilzeitintervalle und/oder die Aktivierungssequenz derart vor, daß das Flackern der auf der Anzeige 14 dargestellten Bilder minimiert ist. Weiterhin gibt er beispielsweise in einem zweiten Betriebszustand beim Vorliegen schnell bewegter Bilder die Reihenfolge der Teilzeitintervalle und/oder die Aktivierungssequenz der Teilzeitgruppen derart vor, daß die Bewegungsartefakte in den auf der Anzeige 14 dargestellten Bildern minimiert sind. For this purpose, the television receiver shown in Figure 1 points as Part of the feature box 6 a motion detector 6a, the Output signals are supplied to the controller 10, 13. This gives in one first operating state when stationary or slowly moving Pictures the order of the part-time intervals and / or the activation sequence such that the flickering of the images shown on the display 14 is minimized. Furthermore, he gives, for example, in a second Operating state when there are fast moving pictures the order of Part-time intervals and / or the activation sequence of the part-time groups in this way before that the motion artifacts in those shown on the display 14 Images are minimized.

Zur Realisierung dieser Betriebszustände greift der Controller 10, 13 auf dem jeweiligen Bewegungsinhalt zugeordnete Datensätze zu, die in verschiedenen Speicherbereichen des Speichers 9 abgespeichert sind.To implement these operating states, the controller 10, 13 engages on the data sets assigned to the respective movement content, which are in different Memory areas of the memory 9 are stored.

Dies ist in der Figur 7 veranschaulicht In der Figur 7 ist gezeigt, daß der Speicher 9 zum Beispiel zwei verschiedene Speicherbereiche 9a und 9b aufweist In jedem dieser Speicherbereiche sind Daten abgespeichert, die dem jeweiligen Teilzeitintervallmuster entsprechen. Je nach Bewegungsinhalt des Bildes, der vom Bewegungsdetektor 6a erfaßt wird, erfolgt eine Adressierung eines der beiden Speicherbereiche, um die dem jeweiligen Teilzeitintervallmuster zugehörigen Daten auszulesen.This is illustrated in FIG. 7. FIG. 7 shows that the Memory 9, for example, two different memory areas 9a and 9b In each of these memory areas, data are stored that correspond to the correspond to the respective part-time interval pattern. Depending on the movement content of the The image that is detected by the motion detector 6a is addressed one of the two memory areas to the respective Read out data belonging to the part-time interval pattern.

Eine vorteilhafte Weiterbildung der Erfindung besteht darin, neben den bereits genannten beiden Betriebszuständen weitere Betriebszustände vorzusehen, wobei jeder dieser weiteren Betriebszustände einem bestimmten Bewegungsinhalt entspricht In diesem Fall weist der Speicher 9 weitere Speicherbereiche auf, die Datensätze für diese weiteren Betriebszustände enthalten.An advantageous development of the invention consists, in addition to that already to provide further operating states in the two operating states mentioned, each of these additional operating states being a specific one In this case, the movement content corresponds to 9 more Storage areas that contain data records for these other operating states contain.

In einer vorteilhaften Ausgestaltung der Erfindung ist der Controller 10, 13 durch einen Pulsbreitenmodulator 10 und einer Zeitensteuerungseinrichtung 13 realisiert.In an advantageous embodiment of the invention, the controller 10, 13 by a pulse width modulator 10 and a timing device 13 realized.

Claims (14)

  1. Pulse-width-controlled picture display device (1, 2), in particular plasma display, having means (10-13) for displaying a sequence of pictures, wherein the time interval available for displaying a picture is divided up into a predetermined number of component time intervals (t1, ..., t8), the pixels of the picture display device (1, 2) are assigned to each of one of two component time groups (TG1, TG2), the means (10) determine from an RGB signal an activation sequence associated with every pixel and, consequently, those component time intervals (t1, ..., t8) of the component time groups (TG1, TG2) during which a pixel is activated, and the pulse-width-controlled picture display device (1, 2) has a detector (6a) for detecting movement in the sequence of pictures, characterized in that the means (9, 10) for altering the sequence of component time intervals (t1, ..., t8) are designed as a function of signals from the detector (6a) and said means (9, 10) control the alteration of the sequence of component time intervals (t1, ..., t8) as a function of the output signal of the detector (6a).
  2. Pulse-width-controlled picture display device (1, 2), in particular a plasma display, having means (10-13) for displaying a sequence of pictures, wherein the time interval available for displaying a picture is divided up into a predetermined number of component time intervals (t1, ..., t8), the pixels of the picture display device (1, 2) are assigned to each of one of two component time groups (TG1, TG2), the means (10) determine from an RGB signal an activation sequence associated with every pixel and, consequently, those component time intervals (t1, ..., t8) of the component time groups (TG1, TG2) during which a pixel is activated, and the pulse-width-controlled picture display device (1, 2) has a detector (6a) for detecting movement in the sequence of pictures, characterized in that the means (9, 10) for altering the activation sequence of the pixels are constructed as a function of signals from the detector (6a) and said means (9, 10) control the alteration of the activation sequence of the pixels as a function of the output signal of the detector (6a).
  3. Pulse-width-controlled picture display device (1, 2), in particular plasma display, having means (10-13) for displaying a sequence of pictures, wherein the time interval available for displaying a picture is divided up into a predetermined number of component time intervals (t1, ..., t8), the pixels of the picture display device (1, 2) are assigned to each of one of two component time groups (TG1, TG2), the means (10) determine from an RGB signal an activation sequence associated with every pixel and, consequently, those component time intervals (t1, ..., t8) of the component time groups (TG1, TG2) during which a pixel is activated, and the pulse-width-controlled picture display device (1, 2) has a detector (6a) for detecting movement in the sequence of pictures, characterized in that the means (9, 10) for altering the sequence of component time intervals (t1, ..., t8) and for altering the activation sequence of the pixels are constructed as a function of signals from the detector (6a) and the means (9, 10) control the alteration of the sequence of the component time intervals (t1, ..., t8) as a function of signals from the detector (6a) and the alteration of the activation sequence of the pixels as a function of the output signal of the detector (6a).
  4. Pulse-width-controlled picture display device (1, 2) according to Claim 1 or 3, characterized in that the means (10-13) operate the pulse-width-controlled picture display device (1, 2) in a plurality of operating states, wherein, in a first operating state, the sequence of component time intervals (t1, ..., t8) is predetermined in the case of the presence of stationary or slowly moving pictures in such a way that flickering of pictures displayed on a picture screen (14) is minimized and wherein, in a second operating state, the sequence of the component time intervals (t1, ..., t8) is predetermined in the case of the presence of rapidly moving pictures in such a way that the motion artefacts in the pictures displayed on the picture screen (14) are minimized.
  5. Pulse-width-controlled picture display device (1, 2) according to either of Claims 2 or 3, characterized in that the means (10-13) operate the pulse-width-controlled picture display device (1, 2) in a plurality of operating states, wherein, in a first operating state, the activation sequence is predetermined in the case of the presence of stationary or slowly moving pictures in such a way that flickering of pictures displayed on a picture screen (14) is minimized and wherein, in a second operating state, the activation sequence is predetermined in the case of the presence of rapidly moving pictures in such a way that the movement artefacts in the pictures displayed on the picture screen (14) are minimized.
  6. Pulse-width-controlled picture display device (1, 2) according to any one of the preceding claims, characterized in that the pulse-width-controlled picture display device (1, 2) has a memory (9) having a plurality of memory areas, wherein every memory area is provided for storing activation sequences that are associated with one of the operating states.
  7. Pulse-width-controlled picture display device (1, 2) according to any of the preceding claims, characterized in that the means (10-13) have a controller (10, 13) that is made up of a pulse-width modulator (10) and a time-control device (13).
  8. Pulse-width-controlled picture display device (1, 2) according to any one of the preceding claims, characterized in that the pulse-width-controlled picture display device (1, 2) has a digital matrix (8) that is provided for processing a digital picture signal (21, 27) and delivers the RGB signal fed to the pulse-width modulator (10) of the drive means (10-13) as output signal.
  9. Pulse-width-controlled picture display device (1, 2) according to any one of the preceding claims, characterized in that the means (10-13) have a time-control device (13) to which vertical and horizontal signals (23, 24) are fed and whose output is connected to the pulse-width modulator (10) and a horizontal driver (12).
  10. Pulse-width-controlled picture display device (1, 2) according to any one of Claims 1 or 3 or 5 to 9, characterized in that, in the first operating state, the sequence of the component time intervals is always chosen in such a way that one of the relationships t1:t2:t3:t4:t5:t6:t7:t8 = 12:4:8:1:2:12:4:8       or t1:t2:t3:t4:t5:t6:t7:t8 = 12:4:8:1:2:12:4:8 applies to the activation time of the component time intervals.
  11. Pulse-width-controlled picture display device (1, 2) according to any one of Claims 1 or 3 or 4 or 6 to 10, characterized in that, in the second operating state, the sequence of the component time intervals is always chosen in such a way that the following relationship t1:t2:t3:t4:t5:t6:t7:t8 = 12:8:4:2:1:4:8:12. applies to the activation times of the component time intervals.
  12. Method of driving a pulse-width-controlled picture display device (1, 2) for displaying a sequence of pictures in which the time interval available for a picture display is divided up into a plurality of temporally consecutive component time intervals (t1, ..., t8) and the pixels of the pulse-width-controlled picture display device (1, 2) are divided into two component time groups (TG1, TG2), wherein the brightness signal assigned to a pixel is generated from an RGB signal by means of an activation scheme and an activation sequence that is derived therefrom and that specifies during which time intervals (t1, ..., t8) the pixel is activated, characterized in that the sequence of the component time intervals (t1, ..., t8) is altered as a function of the motion content of the sequence of pictures to be displayed.
  13. Method of driving a pulse-width-controlled picture display device (1, 2) for displaying a sequence of pictures in which the time interval available for picture display is divided up into a plurality of temporally consecutive component time intervals (t1,..., t8) and the pixels of the pulse-width-controlled picture display device (1, 2) are divided into two component time groups (TG1, G2) wherein the brightness signal assigned to a pixel is generated from an RGB signal by means of an activation scheme and an activation sequence that is derived therefrom and that specifies during which time intervals (t1, ... , t8) the pixel is activated, characterized in that the activation sequence is altered as a function of the motion content of the sequence of pictures to be displayed.
  14. Method of driving a pulse-width-controlled picture display device (1, 2) for displaying a sequence of pictures in which the time interval available for a picture display is divided up into a plurality of temporally consecutive time intervals (t1, ..., t8) and the pixels of the pulse-width-controlled picture display device (1, 2) are divided into two component time groups (TG1, TG2), wherein the brightness signal assigned to a pixel is generated from an RGB signal by means of an activation scheme and an activation sequence that is derived therefrom and that specifies time intervals (t1, ..., t8) during which the pixel is activated, characterized in that the sequence of component time intervals (t1, ..., t8) and the activation sequence are altered as a function of the motion content of the sequence of pictures to be displayed.
EP99932805A 1998-07-25 1999-07-03 Subframe-controlled image display device Expired - Lifetime EP1099211B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE1998133597 DE19833597A1 (en) 1998-07-25 1998-07-25 Pulse width modulated image display device e.g. for plasma display
DE19833597 1998-07-25
DE19837307 1998-08-18
DE19837307A DE19837307A1 (en) 1998-08-18 1998-08-18 Pulse width modulated image display such as a plasma screen that is controlled using a number of sequential time intervals within the display period
PCT/EP1999/004632 WO2000007173A1 (en) 1998-07-25 1999-07-03 Subframe-controlled image display device

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EP1099211A1 EP1099211A1 (en) 2001-05-16
EP1099211B1 true EP1099211B1 (en) 2004-11-03

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DE10051074C1 (en) * 2000-10-14 2002-02-28 Grundig Ag Noise reduction method for pulse width controlled image display device provides selective modification of multi-bit word corresponding to each image point dependent on brightness comparison

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JPH05127612A (en) * 1991-11-05 1993-05-25 Nippon Hoso Kyokai <Nhk> Half-tone image displaying method
US6025818A (en) * 1994-12-27 2000-02-15 Pioneer Electronic Corporation Method for correcting pixel data in a self-luminous display panel driving system
JP3712802B2 (en) * 1996-10-29 2005-11-02 富士通株式会社 Halftone display method and display device

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DE59911003D1 (en) 2004-12-09
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WO2000007173A1 (en) 2000-02-10

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