EP1361559B1 - Réduction des artefacts des images d'un dispositif d'affichage causé par le temps de réponse des phosphores - Google Patents

Réduction des artefacts des images d'un dispositif d'affichage causé par le temps de réponse des phosphores Download PDF

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Publication number
EP1361559B1
EP1361559B1 EP03291000.2A EP03291000A EP1361559B1 EP 1361559 B1 EP1361559 B1 EP 1361559B1 EP 03291000 A EP03291000 A EP 03291000A EP 1361559 B1 EP1361559 B1 EP 1361559B1
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EP
European Patent Office
Prior art keywords
frame
luminous
elements
time response
energy
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Expired - Lifetime
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EP03291000.2A
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German (de)
English (en)
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EP1361559A1 (fr
Inventor
Cédric Thebault
Sébastien Weitbruch
Herbert Hoelzemann
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THOMSON LICENSING
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Thomson Licensing SAS
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Priority claimed from EP02291161A external-priority patent/EP1361558A1/fr
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Publication of EP1361559A1 publication Critical patent/EP1361559A1/fr
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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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0266—Reduction of sub-frame artefacts
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous 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
    • 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
    • G09G3/2003—Display of colours
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/204—Display 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
    • 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
    • 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

Definitions

  • the present invention relates to a method for processing video pictures for display on a display device having at least a first kind of luminous elements with a first time response and a second kind of luminous elements with a second time response being slower than the first time response by driving a luminous element of the first kind for one frame with a predetermined energy. Furthermore, the present invention relates to a corresponding device for processing video pictures.
  • Figure 1 shows the simulation of such a phosphor lag effect on a natural scene with a down shift.
  • a green trail can be seen at the top edge of the trousers of the horseman.
  • the three phosphors have not the same properties because of the chemical differences of the phosphors.
  • life duration and the brightness are privileged at the expense of behaviour homogeneity.
  • the green phosphor G is the slowest, the blue one B is the fastest and the red one R is mostly in-between.
  • a yellow-green trail (right-hand side of the white block of the "displayed picture” of Fig. 2 ), and in front a blue area (left-hand side of the white block of the "displayed picture” of Fig. 2 ), as can be seen in Figure 2 .
  • One known solution is to compensate the colored trail while modifying the blue component in the temporal domain in order to reduce the length of the trail.
  • One other solution is to add a complementary trail on the color trail in order to discolor it.
  • a method and a device for processing video pictures for display on a display device having at least a first kind of luminous elements with a first time response and a second kind of luminous elements with a second time response being slower than the first time response, wherein frames anterior to respective frames by one are superposed on the respective frames at a fixed ratio as to at least one luminous color whose afterglow time is the shortest, already has been disclosed in JP 2002 014647 A .
  • this object is solved by a method for processing video pictures for display on a display device having at least a first kind of luminous elements with a first time response and a second kind of luminous elements with a second time response being slower than the first time response by driving a luminous element of said first kind for one frame with a predetermined energy, and driving said luminous element of said first kind in one frame period with a first part of said predetermined energy and in a following frame period with a second part of said predetermined energy.
  • a device for processing video pictures for display on a display device having at least a first kind of luminous elements with a first time response and a second kind of luminous elements with a second time response being slower than the first time response and driving means for driving a luminous element of said first kind for one frame with a predetermined energy, wherein said driving means enables driving said luminous element of said first kind in one frame period with a first part of said predetermined energy and in a following period with a second part of said predetermined energy.
  • the luminous element of the first kind e. g.
  • blue element may be driven in the one frame period and in the following frame periods with such amounts of energy that the temporal distribution of emitted energy of the luminous element of the first kind corresponds to the time response of the luminous element of the second kind (e. g. red or green element).
  • the blue component Since the phosphor lag is due to the slowness of the green and red phosphors and since it is not possible to make these phosphors faster, the blue component has to be made slower.
  • the phosphor lag artifact can be interpreted in term of energy: a part of the energy of the green and the red components is not transmitted during the present frame but during the next following frames.
  • the phosphor lag problem mainly appears on strong edges of objects in motion, especially on bright to dark transition or the opposite, as described above.
  • the result is a kind of yellowish trail behind each bright to dark transition and a blue area in front of it. This is a result of the difference in the time responses of the phosphors.
  • the idea of this invention is to make this artifact less disturbing for a customer by suppressing the unnatural color of the trail.
  • the green phosphor G the slowest
  • the red R and the blue one B have to be made slower as depicted in Fig. 3 .
  • the phosphor lag can be interpreted in term of energy: a part of the energy of the green and the red components is not transmitted during the present frame but during the next frames.
  • ⁇ is superior to ⁇ since the green phosphor lags more than the red one.
  • the idea is to do the same for the blue component. So only 100- ⁇ percent of the blue component of the actual frame roughly will be transmitted during the actual frame (roughly 100- ⁇ + ⁇ percent of the red component can also be transmitted in order to discolor completely the trail).
  • ⁇ percent of the blue component of the actual frame will be transmitted during the next frame ( ⁇ - ⁇ percent of the red component of the actual frame can also be transmitted in order to discolor completely the trail, as said previously).
  • one or two monochrome pictures (depending whether red is lagged or not), blue_lag and red_lag for example, have to be used to store the lag picture ( ⁇ percent of the blue component of the last frame n-1 and ⁇ - ⁇ percent of the red component of the last frame n-1).
  • the blue lag picture, blue_lag (respectively the red lag picture, red_lag) obtained from the previous frame n-1 is added to 100- ⁇ (respectively 100- ⁇ + ⁇ ) percent of the original blue (respectively red) picture.
  • the resulting picture is the one that will be displayed on the plasma display.
  • ⁇ (respectively ⁇ - ⁇ ) of the original blue (respectively red) picture is stored in the lag picture, blue_lag (respectively red_lag).
  • the white box shifting on a black background by five pixels shall be taken as example.
  • the white pixels of the picture have the same value in the original video signal, but in order to have also a same video level on the screen (to obtain a perfect white), the next values have to be sent to the panels: 255*(1-( ⁇ - ⁇ )/100) for red 255 for green 255*(1- ⁇ /100) for blue
  • the value of the formal white pixels is: 255*( ⁇ - ⁇ )/100 for red 0 for green 255* ⁇ /100 for blue
  • Fig. 6 The behaviour of the human eye is explainable with Fig. 6 .
  • the problem is that the eye does not see directly the video level, but it follows the motion and integrates the light along the integration lines of Fig. 6 through the subfields SF of the frames. Therefore, in this case, the eye perceives a lack of luminance, and so the eye sees the trail due to phosphor lag, as a blue area at the transition of the bright and the dark part of the frame.
  • Figure 8 illustrates the implementation of such an algorithm in the case of a white square moving on a black background.
  • the displayed picture without compensation shows a colored trail, whereas the displayed picture with compensation shows a grey trail.
  • the phosphor trail located behind and in front of the moving object has not change in terms of length but its unnatural colored aspect has disappeared, i. e. the trail has been discolored. With such a processing, the moving object looks like more natural for the customer's eye.
  • Subfield shifting is mostly used to compensate the dynamic false contour effect and also to enhance the sharpness. So if subfield shifting was already used, just the video processing has to be added.
  • FIG. 9 An algorithm block diagram is shown in Fig. 9 .
  • the red, green and blue signals R, G, B are input to a frame memory 1 as well as to a motion estimator 2.
  • the motion estimator 2 also receives the output signal of the frame memory 1.
  • the input signals R, G, B are used for subfield coding 3. For this, they are subjected to a gamma function 4 and a following inventive phosphor lag compensation 5.
  • a frame memory 6 is connected to the phosphor lag compensation unit 5 in order to provide the respective lag pictures.
  • the output of the phosphor lag compensation unit 5 is input to the subfield coding unit 3.
  • a subfield shifting unit 7 forms an output signal from the signals obtained from the motion estimator 2 and the subfield coding unit 3.
  • the present invention is applicable to all matrix displays based on sources presenting different time responses for the three colors and using a similar way of gray level rendition (pulse width modulation).
  • PDP pulse width modulation

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

Claims (13)

  1. Procédé permettant d'afficher des images vidéo sur un dispositif d'affichage doté d'au moins un premier type d'éléments lumineux associés à une première réponse temporelle et d'un deuxième type d'éléments lumineux associés à une deuxième réponse temporelle inférieure à la première réponse temporelle, et dans lequel les trames pour ledit premier type d'éléments lumineux sont superposées selon un rapport fixe de trames antérieures, caractérisé en cela qu'il entraîne ledit élément lumineux dudit premier type dans une trame avec une première quantité d'énergie et dans une trame suivante avec une deuxième quantité d'énergie, dans lequel
    - la somme de la première et de la deuxième quantités d'énergie correspond à la quantité totale d'énergie fournie pour une trame pour ledit élément lumineux et
    - ledit élément lumineux du deuxième type est entraîné dans ladite trame avec la quantité totale d'énergie fournie pour une trame pour ledit élément lumineux du deuxième type, de manière que
    - l'énergie soit émise desdits éléments lumineux desdits premier et deuxième types dans ladite trame suivante.
  2. Procédé selon la revendication 1, dans lequel le dispositif d'affichage comprend en outre un troisième type d'éléments lumineux associés à une troisième réponse temporelle inférieure à la deuxième réponse temporelle.
  3. Procédé selon la revendication 1, dans lequel le dispositif d'affichage est un afficheur plasma.
  4. Procédé selon la revendication 2, dans lequel les éléments lumineux du premier type sont des éléments de phosphore bleu, les éléments lumineux du deuxième type sont des éléments de phosphore rouge et les éléments lumineux du troisième type sont des éléments de phosphore vert.
  5. Procédé selon lequel la revendication 1, dans lequel un facteur entre la première et la deuxième quantité de la dite énergie prédéterminée est déterminé à l'avance et utilisé pour calculer la quantité d'énergie entraînée pour chaque élément lumineux dudit premier type.
  6. Procédé selon la revendication 1, comprenant une étape de stockage dans une mémoire de trame (6) pour tous les éléments lumineux dudit premier type d'une trame au moins des deuxièmes quantités d'énergie prédéterminées pour afficher une période de trame ultérieure.
  7. Dispositif permettant d'afficher des images vidéo sur un dispositif d'affichage doté d'au moins un premier type d'éléments lumineux associés à une première réponse temporelle et d'un deuxième type d'éléments lumineux associés à une deuxième réponse temporelle inférieure à la première réponse temporelle, et un moyen d'entraînement permettant d'entraîner un élément lumineux, et dans lequel les trames dudit premier type d'éléments lumineux sont superposées selon un rapport fixe de trames antérieures, caractérisé en cela que ledit moyen d'entraînement permet d'entraîner ledit élément lumineux dudit premier type dans une trame avec une première quantité d'énergie et dans une trame suivante avec une deuxième quantité d'énergie, dans lequel
    - la somme de la première et de la deuxième quantités d'énergie correspond à la quantité totale d'énergie fournie pour une trame pour ledit élément lumineux et
    - ledit élément lumineux du deuxième type est entraîné dans ladite trame avec la quantité totale d'énergie fournie pour une trame pour ledit élément lumineux du deuxième type, de manière que l'énergie soit émise desdits éléments lumineux desdits premier et deuxième types dans ladite trame suivante.
  8. Procédé selon la revendication 7, dans lequel le dispositif d'affichage comprend des éléments lumineux d'un troisième type associés à une troisième réponse temporelle inférieure à la deuxième réponse temporelle.
  9. Procédé selon la revendication 7, dans lequel ledit dispositif d'affichage est un afficheur plasma.
  10. Dispositif selon la revendication 8, dans lequel les éléments lumineux du premier type sont des éléments de phosphore bleu, les éléments lumineux du deuxième type sont des éléments de phosphore rouge et les éléments lumineux du troisième type sont des éléments de phosphore vert.
  11. Dispositif selon la revendication 7, comprenant en outre une mémoire de trame (6) permettant de stocker pour tous les éléments lumineux dudit premier type d'une trame au moins les deuxièmes quantités d'énergie prédéterminées pour afficher une période de trame ultérieure.
  12. Procédé selon la revendication 1, dans lequel les images vidéo à afficher sur un dispositif d'affichage sont traitées par déplacement de sous-champs afin d'éviter les effets de faux contours.
  13. Dispositif selon la revendication 7, dans lequel ledit dispositif d'affichage comprend en outre une unité de déplacement de sous-champs (7) afin d'éviter les effets de faux contours.
EP03291000.2A 2002-05-07 2003-04-24 Réduction des artefacts des images d'un dispositif d'affichage causé par le temps de réponse des phosphores Expired - Lifetime EP1361559B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03291000.2A EP1361559B1 (fr) 2002-05-07 2003-04-24 Réduction des artefacts des images d'un dispositif d'affichage causé par le temps de réponse des phosphores

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02291161A EP1361558A1 (fr) 2002-05-07 2002-05-07 Réduction des artefacts des images le temps de réponse des phosphores d'un dispositif d'affichage
EP02291161 2002-05-07
EP03291000.2A EP1361559B1 (fr) 2002-05-07 2003-04-24 Réduction des artefacts des images d'un dispositif d'affichage causé par le temps de réponse des phosphores

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EP1361559B1 true EP1361559B1 (fr) 2015-07-29

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Publication number Priority date Publication date Assignee Title
EP1684258A1 (fr) * 2005-01-25 2006-07-26 Thomson Licensing Procédé et appareil pour afficher des images video sur un un panneau d'affichage à plasma

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002014647A (ja) * 2000-06-28 2002-01-18 Fujitsu Hitachi Plasma Display Ltd 表示パネルの駆動方法および駆動装置

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Publication number Priority date Publication date Assignee Title
EP0896317B1 (fr) * 1997-08-07 2008-05-28 Hitachi, Ltd. Méthode et appareil d'affichage d'image en couleur
FR2772502B1 (fr) * 1997-12-15 2000-01-21 Thomson Multimedia Sa Procede de compensation des differences de remanence des luminophores dans un ecran de visualisation d'images
GB9815907D0 (en) * 1998-07-21 1998-09-16 British Broadcasting Corp Improvements in colour displays

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002014647A (ja) * 2000-06-28 2002-01-18 Fujitsu Hitachi Plasma Display Ltd 表示パネルの駆動方法および駆動装置

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