EP1475769A2 - Verfahren und Vorrichtung zur Verbesserung der Grauwertauflösung einer pulsbreitengesteuerten Bildanzeigevorrichtung - Google Patents
Verfahren und Vorrichtung zur Verbesserung der Grauwertauflösung einer pulsbreitengesteuerten Bildanzeigevorrichtung Download PDFInfo
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- EP1475769A2 EP1475769A2 EP04010512A EP04010512A EP1475769A2 EP 1475769 A2 EP1475769 A2 EP 1475769A2 EP 04010512 A EP04010512 A EP 04010512A EP 04010512 A EP04010512 A EP 04010512A EP 1475769 A2 EP1475769 A2 EP 1475769A2
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
- G09G3/2944—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge by varying the frequency of sustain pulses or the number of sustain pulses proportionally in each subfield of the whole frame
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
- G09G2330/045—Protection against panel overheating
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
Definitions
- the invention relates to a method and a device for improving the Gray value resolution of a pulse width controlled image display device.
- Such a method and device come for example for plasma displays, which will be used in future for higher-quality televisions Complement or replace color picture tubes still in use become.
- the user is of higher quality TV sets since the late 80s due to the 100 Hz technology used to a flicker-free display.
- a plasma display which consists of two glass plates with a matrix-like arrangement There are electrodes between which there is a noble gas mixture.
- the image information is not displayed line by line in plasma displays like with cathode steel tubes, but full frame.
- a plasma display do not switch the individual pixels on and on individually at any time can be switched off, the activation of the pixels for the entire display in one activation pass.
- a plasma display is controlled in several phases: one Addressing or initialization phase, a hold or activation phase and a deletion phase.
- the addressing or initialization phase all cells of the plasma display electrically pre-charged, which in the subsequent holding or Activation phase should be activated.
- the deletion phase the preloaded cells are discharged again, the image information is deleted.
- the time interval available for displaying a television picture is in part-time intervals of different duration or different weighting disassembled, during which depending on the brightness value of a a given activation sequence is selected for each pixel. This corresponds to a single or repeated lighting up of the respective pixel during the time interval available for image display, a predetermined period of time being assigned to each lighting up.
- Known plasma displays of this type are used, for example, by companies Fujitsu and NEC manufactured and distributed.
- DE-A1 198 37 307 describes a motion detector-dependent one Change in the order of the part-time intervals known.
- the order of the part-time intervals is chosen such that Movement artifacts can be avoided. Otherwise the choice is made Sequence of part-time intervals in such a way that 50Hz flicker interference is reduced become.
- a disadvantage of this approach is that the contrast of the image to be displayed is reduced because when the brightness of the image to be displayed the time period for the display of bright image components is reduced and with the detected low brightness of an image to be displayed dark gray parts of the image are shown in light gray, as these are represented by the described loading with a constant offset pulled up become, d. H. shine longer.
- DE 101 12 622 describes a method and a device for Improvement of the gray value resolution in a pulse width controlled image display device known. This will be available for an image display standing time interval in consecutive weighted part-time intervals split, with low-weight part-time intervals and part-time intervals with higher weighting are provided. Is by evaluation the brightness of an image to be displayed recognized that a dark image is present, then the use of part-time intervals with higher Weighting is dispensed with and instead the number of part-time intervals low weightings by using additional part-time intervals with low weights increased, with the weights of the additional Part-time intervals from the weights of the first part-time intervals with low Differentiate weights. This will improve the gray value resolution reached when dark images are present.
- a disadvantage of this The procedure is that of commercially available plasma displays with integrated control usually the assignment of the for the representation of a certain Gray values to be addressed part-time intervals in the inaccessible Control circuit predefined, d. H. cannot be changed.
- Color plasma displays also have a regulation to control the Power consumption on.
- the purpose of this regulation is to prevent the display from being destroyed protect by overheating.
- It is related to this Plasma displays are known to measure power consumption either by measurement of the sustainer current or by evaluating the brightness of a display Capture image. In the latter case, the captured Brightness value for each of the part-time intervals of the image to be displayed maximum permissible light duration derived and when the detected brightness value the maximum permissible lighting duration for each of the Part-time intervals changed. This change is such that at captured dark image content or low brightness value the maximum permissible lighting duration is selected in each of the part-time intervals.
- the brightness detection of the image to be displayed that a If the overall picture content is bright, the maximum permissible light duration for each of the part-time intervals decreased by a period of time.
- the reduction of Light duration follows - depending on the integral brightness of the image to be displayed - a function that limits performance at upper permissible value reached.
- the control takes place by reducing the number of sustainer pulses per part-time interval to realize the power limitation at the upper limit.
- the reduction the number of sustainer pulses per part-time interval is proportional for the duration of a part-time interval.
- the big disadvantage of this approach is that at large Brightness of the image to be displayed the time period for the display to be brighter Image components is reduced, white then turns gray. At low brightness one In return, the image to be displayed becomes dark gray image components shown in light gray. This is particularly unpleasant in the image impression off if the brightness is low over the entire image area because then the brightness transitions between the individual gray levels are very large. For the image impression, this means that the step size between two brightness levels is very large. Only a few gray values occur with dark image content on, this can lead to the expansion of very bright areas is great. In connection with the large step size between two brightness levels this leads to a very unsightly picture impression.
- the object of the invention based on showing a way, as in a pulse width controlled image display device the gray value resolution, avoiding the from the Disadvantages known in the art can be improved.
- the method according to claim 1 can achieve that at relative dark pictures, without striking bright areas, the total number of representable discrete gray levels on the gray value range of the to be displayed Image is mapped, resulting in an optimal resolution for such image content of this gray value range results without any impairment the presentation of dark images is accompanied by light areas.
- 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 of an antenna device 19 are fed.
- the signals of input 17 are to a high frequency and intermediate frequency processing unit 4 and an audio signal processing unit 3.
- a CVBS signal At the output of the high-frequency and intermediate-frequency processing unit 4 there is a CVBS signal, which is via a gray value optimization circuit to be explained later 34 an analog / digital converter 5 is supplied.
- the An external CVBS signal is fed in via a second signal input 20 possible, other signals, e.g. B. RGB, Y / C, YUV etc.
- the output signal of the analog / digital converter 5 then becomes a so-called feature box 6 directed.
- the feature box 6 performs certain functions such as demodulation of the CVBS signals, still image, zoom, format adjustment, image sharpness optimization, Picture-in-picture, etc. through the resulting digital components Y, U, V of an image signal 21 are sent to a digital matrix unit 8 of the image processing part 2 forwarded.
- the Feature Box 6 is also used for conversion the interlaced signal into an interlaced signal and the necessary Adaptation of the signals to the screen 14 by line interpolation. This is done using the synchronization signals 23, 24 for vertical and Horizontal synchronization.
- the digital matrix unit 8 also has a connection 27 for feeding a VGA signal supplied via an external signal input 18, which is converted into a digital signal by means of an analog / digital converter 25 becomes.
- a VGA signal supplied via an external signal input 18, which is converted into a digital signal by means of an analog / digital converter 25 becomes.
- the VGA signal in the signal path to provide a gray value optimization circuit, this would be the Analog / digital converter 25 connected upstream.
- RGB signal 22 At the output of the digital matrix unit 8 there is an RGB signal 22 with which a pulse width modulator 10 is controlled.
- the pulse width modulator 10 generates the control signals from the RGB signal 22 26 for an address driver 11. For this signal generation is with the Pulse width modulator 10 coupled to a memory 9.
- the pulse width modulator 10 has a part-time interval weighting unit which is used to weight the Serves part-time intervals, d. H. to determine their order and duration.
- the address driver device 11 controls the individual columns of the Plasma screen 14 on.
- the associated time control is carried out using the Time control device 13, the start of the part-time intervals and the times for the addressing and activation phase. This is used in the time control included part-time interval line controller.
- the timing device 13 is connected to a horizontal driver 12. This horizontal driver 12 is active during the activation phases.
- the power supply takes place with the help of a power supply 7.
- a plasma display device consists of a Variety of very small gas discharge areas. Because of this design principle such a display device has a digital relationship between the input quantity and the luminance. It exists thus only two states for the gas discharge areas: switched on or switched off. To still have a wide range of different To be able to achieve intermediate gray levels is shown in FIG. 1 Image processing part 2 for image display a digital time division multiplex method used. In this, the RGB signals 22 are in several part-time intervals of different duration, d. H. at different part-time intervals Weighting.
- the Pulse width modulator 10 is determined by an assignment based on its input signal level depends on each pixel of the image to be displayed the order and activation of the individual part-time intervals. In case of a binary weighting this assignment looks such that the digitally weighted Bit the longest part-time interval, the second most weighted bit the second longest part-time interval, etc. is assigned.
- FIG 2 is an exemplary sequence of such part-time intervals, such as during a full screen takes place.
- the time to display one Full screen is 20 milliseconds and is in eight part-time intervals, which is also called Subfields (SF1 to SF 8) are divided.
- the subfields or part-time intervals are weighted in binary, as already explained above. With such a weighting of "black” (minimum brightness) to "white” (maximum brightness) display a total of 256 gray levels.
- the individual part-time intervals are broken down, as exemplified by the subfield SF 6 shown in an addressing phase 28 and a sustain phase 29.
- the addressing phase 28 becomes all pixels of the plasma display device 14 addressed, which should light up in the subfield SF 6.
- the individual pixels are addressed to those already above described way.
- Actual activation of the display in the sustain phase 29 are by means of a sustain pulse generator 31, which is shown in FIG Horizontal driver 12 is included, one for the subfield - in the present Example of subfield SF 6 - specific number of sustain pulses generated. These sustain pulses then cause a corresponding light emission of the pixels that are addressed during this subfield SF 6 were.
- the RGB signal 22 determines a specific value for a given brightness or gray value into a corresponding one integral luminance implemented that determined for this pixel, the subfield assigned to the gray value to be displayed within the for the representation of a full picture given time interval are addressed, so that in the sustain phases, which follow the addressing phases, one appropriate light emission is generated.
- the subfield 256 different brightness or gray values can be displayed to the To map the range from minimum luminance to maximum luminance.
- the display options offered by the plasma display device 14 are, as already mentioned, subject to physical limits. For one overall good image impression, it is desirable for images with an image content which is in the middle gray area and contains light or white areas, one for the brilliant display of these bright or white areas to generate high luminance. However, this means that the z. B. 256 representable gray levels to a correspondingly large brightness range must be divided.
- a video level integrator 30 included which generates the integral of the frame from the RGB signal 22 and with a signal corresponding to the integral of the frame
- Sustain pulse limiter 32 acts in such a way that this on the sustain pulse generator 31 has a limiting effect if this is from the video level integrator 30 signal supplied to the sustain pulse limiter 32 a predetermined Value exceeds.
- the sustain pulses are limited in in such a way that, as shown by way of example in FIG. 2a, the number of sustain pulses 29 in each subfield versus the maximum number of sustain pulses a predetermined percentage is reduced. This measure changes the weighting of the part-time intervals or subfields among themselves not so that the number of gray values that can be displayed remains the same, but it will overall a reduction in the luminance of the plasma display device 14 causes, evenly over all representable gray values.
- Gray scale 33 is shown covering the range from minimum luminance to maximum Luminance includes. For the sake of simplicity, it is assumed below that the range from minimum luminance to maximum luminance through 12 discrete Gray values G1 to G12 can be displayed. For the representation of the addressed The entire available gray area is used. Although the gray area 35 which occurs in addition to the white areas 37 only the gray values G1 to G6 includes. As a result, the white areas 37 appear very bright, the image appears brilliant in the image impression, the weaknesses in the gray value display are hardly significant.
- this includes the comparatively dark areas Image, as shown in FIG. 3a, actually only the gray area 35, that is to say Grayscale G1 to G6.
- the consequence for the image impression is that the big one Increment between the individual discrete brightness values e.g. B. G1 and G2, the associated gradation of the gray transitions and the consequence emerging larger areas of equal brightness clearly in the foreground to step.
- the picture impression is unsatisfactory.
- a video signal in the example the CVBS signal, is due on the one hand to a delay circuit 38, the purpose of which will be explained later and on the other hand on an analog / digital converter 39. From the analog / digital converter 39, the now digital video signal arrives in an image memory 40, such that it is written with the digital data of at least one video image is.
- the control measures when writing to an image memory are known to the person skilled in the art and therefore do not require any further explanation.
- the content of the image memory is checked by means of an image analyzer 41 analyzed the content of his picture to determine whether white areas appear in the picture, which are above a specified area and whether the image to be displayed in its integral brightness and / or in its maximum Brightness value corresponds to certain predetermined values.
- the time for submitting the Output signal to the sustain pulse limiter 32 can be from the Time control circuit 13 (Fig. 1) are triggered.
- the reduction of the sustain pulses per subfield happens z. B. as a percentage of the maximum number of sustain pulses occurring within a subfield. By this measure all gray values that can be displayed are shifted towards black.
- the Sustain pulse correction is z. B. selected so that the maximum representable Gray value corresponds to the brightest gray value occurring in the image. So it will the total number of gray values that can be displayed on those actually occurring in the image Gray area mapped, which significantly reduces the step size between two successive gray values and thus also a corresponding reduction in the areas appearing in an image has the same gray value. But with this transformation comes that the original gray values in the image are now different Are gray values. To cancel this shift towards black again and a color-correct representation on the plasma display device 14 To achieve this, compensation must be made.
- the delay circuit 38 has the purpose of the video signal, in the example the CVBS signal, for so long delay until the corresponding video frame is analyzed and the Sustain pulse correction on the one hand and the gain factor on the other hand, from Image analyzer 41 are determined so that the amplifier 42 that the analyzed video frame associated video signal with the through the Analysis gained gain factor amplified. For timely delivery of the signal determining the gain by the image analyzer 41 this can be triggered by the delay circuit 38.
- the corrected video signal in the example the modified CVBS signal 43, arrives now on the analog / digital converter 5 and is processed as in Connection with Fig. 1 described.
- the in the analysis process from the image analyzer 41 determined sustain pulse correction is accomplished via a corresponding signal, the image analyzer 41 then to the sustain pulse limiter 32 from when the associated image for display on the plasma display device 14 is waiting to be displayed.
- the necessary synchronization processes are familiar to a person skilled in the art and require no further explanation.
- the starting point for the consideration are the relationships shown in FIG. 4.
- the comparatively dark image comprises the gray area 35, that is to say the grayscale G1 to G6.
- the consequence for the image impression is that the large step size between the individual discrete brightness values e.g. B. G1 and G2 so connected level of gray transitions and the consequent larger areas of the same brightness are clearly recognizable.
- the picture impression is unsatisfactory.
- the video signal is amplified, in the example of Fig. 1 or Fig. 1a of the composite signal, such that the highest level in the signal - in the selected example this is Level assigned to the gray value G6 - corresponds to the level for the color "white".
- this corresponds to the gray value G6, it becomes the signal level for "white” and corresponds to after amplification now the gray value G12.
- This also addresses the part-time intervals made for the relevant pixel according to the gray value G12, is caused by the sustain pulse correction described above but actually only the Gau value G12 'is shown which corresponds to the gray value G6.
- the image analyzer 41 detects this and influences it via the sustain pulse limiter 32 and the sustain pulse generator 31 Number of sustain pulses per part-time interval or subfield for all subfields within the full image to be displayed so that for the display of the bright Surfaces 36 have a lighter gray value than that outside of the small bright areas 36 occurring maximum gray value G6.
- the gray value can be darker than the gray value G10 that the light ones Have surfaces 36, predetermined, that is, for example, correspond to the gray value G9.
- the image analyzer reduces the number the Sustain Pulse so that the maximum gray value that can be displayed is the gray value G9 corresponds and controls the gain of amplifier 42 so that the highest level occurring in the modified video signal is the level for the Gray value corresponds to G11.
- the sustain pluls correction only becomes the gray area up to the gray value G9 shown. By doing this, the light areas become something reproduced too dark, but the gray value resolution is improved, what is conducive to a more balanced picture impression.
- the image analyzer 41 leaves the sustain pulse limiter 32 unaffected and acts on the amplifier 42 so that it does not change the video signal.
- the image analyzer 41 described in connection with FIG. 1a offers the possibility of to analyze the image to be displayed according to all possible criteria and, depending on the analysis result, the sustain pulse limiter 32 on the one hand and the amplifier 42 on the other hand so that a Optimal in the gray value display of dark images is achieved without simultaneously affect the appearance of light areas.
- Evaluation options are used in the image analyzer 41 or in operative connection with the image analyzer 41, provide a memory, in which reference values relating to the image analysis are stored, the are compared with the values obtained by the image analyzer 41 from the image analysis wins, with the reference values then again being assigned control values with which the image analyzer 41 the sustain pulse limiter 32nd and applied to amplifier 42 so as to be as described above Way to optimize the gray value resolution depending on the image content.
- An advantageous development of the invention consists in the analysis of several successive images in the sense of a temporal filtering perform. This allows z. B. achieve that brightness jumps in consecutive images do not cause an abrupt change in the number of the sustain pulses or the amplification generated, but to one gradual adjustment in the sense of a transition function.
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Abstract
Description
- Figur 1
- ein Blockschaltbild eines Fernsehempfängers mit einer Grauwert-Optimierungsschaltung zur Ansteuerung pulsbreitengesteuerter Plasmadisplayanzeigen;
- Figur 1a
- ein Blockschaltbild einer Grauwert-Optimierungsschaltung
- Figur 2 und 2a
- beispielhafte Diagramme zur Erläuterung der Erfindung und
- Figur 3 bis 4c
- weitere beispielhafte Diagramme zur Erläuterung der Erfindung.
Claims (18)
- Verfahren zur Verbesserung der Grauwertauflösung bei einer mit einem Videosignal beaufschlagten pulsbreitengesteuerten Bildanzeigevorrichtung, bei welchem das für eine Bilddarstellung zur Verfügung stehende Zeitintervall in aufeinanderfolgende unterschiedlich gewichtete Teilzeitintervalle aufgeteilt wird und die den Bildpunkten des darzustellenden Bildes zugehörigen Helligkeitssignale durch Umwandlung in den Teilzeitintervallen zugeordnete Aktivierungssequenzen erzeugt werden, wobei die Aktivierungssequenzen aus jeweils vorgegebenen Anzahlen von Sustain-Pulsen bestehen und die Anzahl der Sustain-Pulse für alle Aktivierungssequenzen die innerhalb eines Zeitintervalls für die Darstellung eines Bildes liegen, veränderbar ist,
dadurch gekennzeichnet, dass
in einer Analyse des darzustellenden Bildes die Bildhelligkeitsverhältnisse des darzustellenden Bildes erfasst werden, wobei in der Bildanalyse erkannt wird, wenn Bilder mit überwiegend dunklen Bildpartien ohne größere helle Bildflächen dargestellt werden sollen wobei dann in Abhängigkeit von den ermittelten Bildhelligkeitsverhältnissen ein erstes Signal erzeugt wird, das die Anzahl der Sustain-Pulse für Aktivierungssequenzen, die innerhalb des Zeitintervalls für die Darstellung des Bildes liegen, um einen den ermittelten Bildhelligkeitsverhältnissen zugeordneten Grad verändert und ein zweites Signal erzeugt wird, das über einen im Analogteil des Videosignalweges angeordneten Verstärker (42) das Videosignal so beeinflusst, dass die durch das erste Signal bedingte Bildhelligkeitsänderung zumindest teilweise kompensiert wird. - Verfahren nach Anspruches 1
dadurch gekennzeichnet, dass
in einer Analyse des darzustellenden Bildes die maximal auftretende Helligkeit ermittelt wird und in Abhängigkeit von der jeweils gefundenen Helligkeitein erstes Signal erzeugt wird, das die Anzahl der Sustain-Pulse für Aktivierungssequenzen die innerhalb eines Zeitintervalls zur Darstellung eines Bildes liegen, um einen der Helligkeit zugeordneten Grad verändert undein zweites Signal erzeugt wird, das über den Verstärker (42) das Videosignal derart beeinflusst, dass die durch das erste Signal bedingte Bildhelligkeitsänderung zumindest teilweise kompensiert wird. - Verfahren nach Anspruches 1
dadurch gekennzeichnet, dass
in einer Analyse des darzustellenden Bildes ermittelt wird, ob im darzustellenden Bild Flächen vorhanden sind, deren Helligkeit und deren Flächenausdehnung innerhalb vorgegebener Wertebereiche liegen und dass in Abhängigkeit von den jeweils gefundenen Wertebereichspaarenein erstes Signal erzeugt wird, das die Anzahl der Sustain-Pulse für Aktivierungssequenzen die innerhalb eines Zeitintervalls zur Darstellung eines Bildes liegen, um einen den Wertebereichspaaren zugeordneten Grad verändert undein zweites Signal erzeugt wird, das über den Verstärker (42) das Videosignal derart beeinflusst, dass die durch das erste Signal bedingte Bildhelligkeitsänderung zumindest teilweise kompensiert wird. - Verfahren nach Anspruches 1
dadurch gekennzeichnet, dass
in einer Analyse des darzustellenden Bildes die maximal auftretende Helligkeit ermittelt wird und dass
bei Unterschreiten eines vorgegebenen maximalen Helligkeitswertes in Abhängigkeit vom der jeweils gefundenen Helligkeitein erstes Signal erzeugt wird, das die Anzahl der Sustain-Pulse für Aktivierungssequenzen die innerhalb eines Zeitintervalls zur Darstellung eines Bildes liegen, um einen der Helligkeit zugeordneten Grad verändert undein zweites Signal erzeugt wird, das über den Verstärker (42) das Videosignal so beeinflusst, dass die durch das erste Signal bedingte Bildhelligkeitsänderung zumindest teilweise kompensiert wird,ein erstes Signal erzeugt wird, das die Anzahl der Sustain-Pulse für Aktivierungssequenzen die innerhalb eines Zeitintervalls zur Darstellung eines Bildes liegen, um einen den Wertebereichspaaren zugeordneten Grad verändert undein zweites Signal erzeugt wird, das über den Verstärker (42) das Videosignal so beeinflusst, dass die durch das erste Signal bedingte Bildhelligkeitsänderung zumindest teilweise kompensiert wird. - Verfahren nach einem der Ansprüche 2 oder 3 oder 4,
dadurch gekennzeichnet, dass
zusätzlich die integrale Helligkeit des darzustellenden Bildes ermittelt und mit dem größten im darzustellenden Bild auftretenden einzelnen Helligkeitswert oder dem Helligkeitswert der hellsten im darzustellenden Bild auftretenden Fläche verglichen wird und der Helligkeitsunterschied Wertebereichen zugeordnet wird denen wiederum Veränderungsgrade zugeordnet sind und dass in Abhängigkeit von dem Wertebereich in dem der Helligkeitsunterschied liegt, das erste Signal und das zweite Signal um einen dem Wertebereich zugeordneten Grad verändert wird. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Veränderung der Anzahl der Sustain-Pulse ausgehend von einer maximalen Anzahl durch Verringerung erfolgt. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Veränderung der Anzahl der Sustain-Pulse für alle Aktivierungssequenzen die innerhalb des Zeitintervalls zur Darstellung des Bildes liegen, einer vorgegebenen Funktion folgt, derart, dass die Funktion für jedes Teilzeitintervall den Grad der Veränderung angibt. - Verfahren nach Anspruch 7,
dadurch gekennzeichnet, dass
die Funktion eine lineare Funktion ist. - Verfahren nach Anspruch 7,
dadurch gekennzeichnet, dass
die Funktion eine logarithmische Funktion ist. - Verfahren nach Anspruch 7,
dadurch gekennzeichnet, dass
die Funktion eine empirisch ermittelte Funktion ist. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Analyse von mehreren aufeinanderfolgenden Bildern im Sinne einer zeitlichen Filterung durchgeführt wird und dass bei sprunghaften Änderungen in aufeinanderfolgenden Bildern die Veränderung des ersten Signals und des zweiten Signals stufenweise erfolgt. - Verfahren nach Anspruch 11,
dadurch gekennzeichnet, dass
die stufenweise Veränderung des ersten Signals und des zweiten Signals einer vorgegebenen Übergangsfunktion folgt. - Verfahren nach Anspruch 12,
dadurch gekennzeichnet, dass
der Verlauf der Übergangsfunktion von der Art der sprunghaften Änderung abhängt. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
es sich bei der pulsbreitengesteuerten Bildanzeigevorrichtung um eine konfektionierte, die Ansteuerschaltungen bereits beinhaltende Bildanzeigevorrichtung handelt. - Vorrichtung zur Verbesserung der Grauwertdarstellung bei einer konfektionierten, pulsbreitengesteuerten Bildanzeigevorrichtung, mitAnsteuermitteln (9 - 13) zur Aufteilung des für eine Bilddarstellung zur Verfügung stehenden Zeitintervalls in aufeinanderfolgende gewichtete Teilzeitintervalle und zur Erzeugung von Helligkeitssignalen, welche den Bildpunkten des darzustellenden Bildes zugehörigen sind, die Ansteuermitteln (9 - 13) eine Umwandlung der den Zeitintervallen zugeordnete Aktivierungssequenzen vornehmen, wobei die Aktivierungssequenzen aus jeweils vorgegebenen Anzahlen von Sustain-Pulsen bestehen die von einem Sustain-Puls-Generator (31) erzeugt werden der einen von extern beaufschlagbaren Eingang aufweist und über diesen Eingang die Anzahl der Sustain-Pulse für Aktivierungssequenzen, die innerhalb eines Zeitintervalls für die Darstellung eines Bildes liegen, veränderbar ist,mit einer von einem analogen Videosignal beaufschlagten Grauwert-Optimierungsschaltung (34), wobei die Grauwert-Optimierungsschaltung (34) erkennt, ob Bilder mit überwiegend dunklen Bildpartien ohne größere helle Bildflächen dargestellt werden sollen und dann in Abhängigkeit von ermittelten Bildparametern erste Signale und zweite Signale erzeugt,mit einem Sustain-Puls-Begrenzer (32) der über seinen Eingang von der Grauwert-Optimierungsschaltung (34) mit den ersten Signalen beaufschlagbar ist, derart, dass der Sustain-Puls-Begrenzer (32) den Sustain-Puls-Generator (31) so ansteuert, dass dieser die Anzahl der Sustain-Pulse für Aktivierungssequenzen die innerhalb des Zeitintervalls zur Darstellung des darzustellenden Bildes liegen, um einen durch die ersten Signale vorgegebenen Grad verändert,die Grauwert-Optimierungsschaltung (34) in Abhänigkeit von den zweiten Signalen das Videosignal so verändert auf ihren Ausgang gibt, dass die durch die Veränderung der Anzahl der Sustain-Pulse bewirkte Helligkeitsänderung des darzustellenden Bildes zumindest teilweise kompensiert wird.
- Vorrichtung nach Anspruch 15,
dadurch gekennzeichnet, dass
die Grauwert-Optimierungsschaltung (34) eine Verzögerungsschaltung (38), einen Verstärker (42), einen Analog-/Digitalwandler (39), einen Bildspeicher (40) und einen Bildanalysator (41) enthält, wobeidas Videosignal einerseits die Verzögerungsschaltung (38) und andererseits den Analog-/Digitalwandler (39) beaufschlagt,das digitalisierte Videosignal in den Bildspeicher (40) eingelesen wird, derart, dass dieser zumindest ein vollständiges darzustellendes Bild enthält,der Bildanalysator (41) die Helligkeitsverhältnisse des im Bildspeicher (40) enthaltenen Bildes analysiert, und als Ergebnis dieser Analyse die ersten und die zweiten Signal erzeugt,der Bildanalysator (41) die zweiten Signale an den Verstärker (42) anlegt, wenn dieser von der Verzögerungsschaltung das verzögerte Videosignal des analysierten Bildes erhält,der Bildanalysator (41) die ersten Signale an den Sustain-Puls-Begrenzer (32) anlegt, wenn das Bild zur Darstellung auf der Plasmaanzeigeeinrichtung (14) ansteht. - Vorrichtung nach Anspruch 16,
dadurch gekennzeichnet, dass
der Bildanalysator (41) zur Abgabe der zweiten Signale durch die Verzögerungsschaltung (38) getriggert wird. - Vorrichtung nach Anspruch 16,
dadurch gekennzeichnet, dass
der Bildanalysator (41) zur Abgabe der ersten Signale durch eine Zeitsteuereinrichtung (13) getriggert wird.
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DE2003120300 DE10320300A1 (de) | 2003-05-07 | 2003-05-07 | Verfahren und Vorrichtung zur Verbesserung der Grauwertauflösung einer pulsbreitengesteuerten Bildanzeigevorrichtung |
DE10320300 | 2003-05-07 |
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CN116721627A (zh) * | 2023-06-20 | 2023-09-08 | 铠强科技(平潭)有限公司 | 数据信号处理方法和数据信号处理装置 |
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EP0973331A1 (de) * | 1998-07-17 | 2000-01-19 | Deutsche Thomson-Brandt Gmbh | Vorrichtung zum Steuern der Helligkeit |
EP1014330A2 (de) * | 1998-12-24 | 2000-06-28 | Fujitsu Limited | Steuerung des dynamischen Bereichs eines Anzeigegeräts |
EP1071281A1 (de) * | 1998-03-06 | 2001-01-24 | Matsushita Electric Industrial Co., Ltd. | Vorrichtung und verfahren zur automatischen luminanzregelung |
US20010006377A1 (en) * | 1997-12-10 | 2001-07-05 | Matsushita Electric Industrial Co., Ltd. | Display apparatus capable of adjusting subfield number according to brightness |
US20020149504A1 (en) * | 2001-04-13 | 2002-10-17 | Jyh-Guo Hwang | Analog to digital conversion device |
EP1265213A2 (de) * | 2001-06-08 | 2002-12-11 | Pioneer Corporation | Anzeigevorrichtung und Verfahren |
-
2003
- 2003-05-07 DE DE2003120300 patent/DE10320300A1/de not_active Ceased
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2004
- 2004-05-04 EP EP04010512A patent/EP1475769A3/de not_active Ceased
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010006377A1 (en) * | 1997-12-10 | 2001-07-05 | Matsushita Electric Industrial Co., Ltd. | Display apparatus capable of adjusting subfield number according to brightness |
EP1071281A1 (de) * | 1998-03-06 | 2001-01-24 | Matsushita Electric Industrial Co., Ltd. | Vorrichtung und verfahren zur automatischen luminanzregelung |
EP0973331A1 (de) * | 1998-07-17 | 2000-01-19 | Deutsche Thomson-Brandt Gmbh | Vorrichtung zum Steuern der Helligkeit |
EP1014330A2 (de) * | 1998-12-24 | 2000-06-28 | Fujitsu Limited | Steuerung des dynamischen Bereichs eines Anzeigegeräts |
US20020149504A1 (en) * | 2001-04-13 | 2002-10-17 | Jyh-Guo Hwang | Analog to digital conversion device |
EP1265213A2 (de) * | 2001-06-08 | 2002-12-11 | Pioneer Corporation | Anzeigevorrichtung und Verfahren |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN116721627A (zh) * | 2023-06-20 | 2023-09-08 | 铠强科技(平潭)有限公司 | 数据信号处理方法和数据信号处理装置 |
CN116721627B (zh) * | 2023-06-20 | 2024-04-23 | 铠强科技(平潭)有限公司 | 数据信号处理方法和数据信号处理装置 |
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