EP1335341B1 - Procédé et appareil pour le traitement d'images vidéo - Google Patents

Procédé et appareil pour le traitement d'images vidéo Download PDF

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Publication number
EP1335341B1
EP1335341B1 EP20030000172 EP03000172A EP1335341B1 EP 1335341 B1 EP1335341 B1 EP 1335341B1 EP 20030000172 EP20030000172 EP 20030000172 EP 03000172 A EP03000172 A EP 03000172A EP 1335341 B1 EP1335341 B1 EP 1335341B1
Authority
EP
European Patent Office
Prior art keywords
sub
field
sustain
priming
period
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
EP20030000172
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German (de)
English (en)
Other versions
EP1335341A3 (fr
EP1335341A2 (fr
Inventor
Sebastian Weitbruch
Cédric Thebault
Axel Goetzke
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.)
Deutsche Thomson Brandt GmbH
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Deutsche Thomson Brandt GmbH
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 EP02000946A external-priority patent/EP1329869A1/fr
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Priority to EP20030000172 priority Critical patent/EP1335341B1/fr
Publication of EP1335341A2 publication Critical patent/EP1335341A2/fr
Publication of EP1335341A3 publication Critical patent/EP1335341A3/fr
Application granted granted Critical
Publication of EP1335341B1 publication Critical patent/EP1335341B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • 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
    • G09G3/292—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 reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
    • G09G3/2927—Details of initialising
    • 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
    • G09G2320/0238—Improving the black level
    • 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
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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 present invention relates to a method for processing video pictures, especially to a method for controlling priming pulses for improving the quality of pictures displayed on matrix display screens like plasma display panels (PDPs) or other display devices based on the principle of duty cycle modulation (PWM for Pulse Width Modulation) of light emission.
  • PDPs plasma display panels
  • PWM Pulse Width Modulation
  • the invention also relates to an apparatus for carrying out the method.
  • a plasma display panel is constituted by two insulating plates sealed together to form a space filled with gas. Ribs are provided inside the space to form a matrix array of discharge cells which could only be "ON” or “OFF". Also, unlike other displays such as CRT (Color ray tube) or LCD (Liquid Crystal Display) in which grey levels are expressed by analogue control of the light emission, a PDP controls the grey level by modulating the number of light pulses per frame. These light pulses are known as sustain pulses. The time-modulation will be integrated by the eye over a period corresponding to the eye time response.
  • contrast is of paramount importance.
  • contrast values are inferior to those achieved for CRTs due, at least, to the following reasons :
  • the object of the invention is to propose a new priming concept which increases the contrast ratio and decreases response fidelity problems.
  • the object of the invention is also to propose a new priming concept which can be used with the process described in PCT patent application No WO01/56003 .
  • the present invention relates to a method as defined in claim 1.
  • a priming period is added at the beginning of the sub field n+1.
  • the above method may be improved by also adding a priming pulse at the beginning of the video field.
  • a priming pulse is used in combination with an optimised coding such as a specific coding enabling to respect the Single-O-Level criterion in order to improve the panel response fidelity.
  • optimised coding such as a specific coding enabling to respect the Single-O-Level criterion in order to improve the panel response fidelity. This criterion allows only a maximum of one sub-field switched OFF between two sub-fields switched ON.
  • the determination of a sustain threshold value is done using a specific test pattern, modifying the sustain pulses number and determining for which sustain pulses number a response fidelity problem is visible, said number giving the sustain threshold value D.
  • Said apparatus may comprise a peak luminance enhancement (PLE) measuring unit, a sub-field coding unit and a plasma control unit.
  • Said plasma control unit comprises at least an encoding look up table for storing various sub-field codes per PLE value, a selection of appropriate sustain table giving the sustain threshold value and priming table for PDP controlling.
  • FIG. 1 On figure 1 , a sub-field organisation with 12 sub-fields SF1 to SF12 is presented.
  • the weights of the sub-fields are as follows 1 ⁇ 2 ⁇ 3 ⁇ 5 ⁇ 8 ⁇ 12 ⁇ 18 ⁇ 24 ⁇ 31 ⁇ 40 ⁇ 50 ⁇ 61.
  • the specific weight in said sub-fields SFi(1 ⁇ i ⁇ 12) represents a subdivision of the 256 video levels to be rendered in 8 bit video mode. Then each video level from 0 to 255 will be rendered by a combination of those sub-fields, each sub-field being either fully activated or deactivated So, 256 video levels can be generated with this sub-field organisation as required in TV/video technology.
  • Figure 1 illustrates the frame period that is for example of 16,6 ms for 60 Hz frame period and its sub-division in sub-fields SF.
  • Each sub-field SF is a period of time in which successively the following is being done with a cell.
  • a single soft priming P is used at the beginning of the frame period.
  • the weights of the sub-fields are based on the mathematical Fibonacci sequence as described in PCT patent application No. WO 01/56003 .
  • This optimised sub-fields encoding enables to have no more than one sub-field OFF between two sub-fields ON (SOL concept). In fact, under some circumstances, this type of sub-field organisation with a single soft priming is not enough to obtain, perfect response fidelity.
  • the method of the present invention also uses a power control method as described for example in WO00/46782 in the name of THOMSON Licensing S.A..
  • This method generates more or less sustain pulses as a function of average picture power, i.e., it switches between different modes with different power levels.
  • the sub-field organisation is variable in respect to a factor for the sub-field weights which is used to vary the amount of small pulses generated during each sub-field. More specifically, the sub-field weight factor determines how many sustain pulses are produced for the sub-fields, e.g. if this factor is *2, that means that the sub-field weight number is to be multiplied by two to achieve the number of sustain pulses which are generated during an active sub-field period.
  • the factor is determined by dividing the total number of sustain pulses by 255 which corresponds to the coding of the video levels.
  • the total number of sustain pulses depends on the measure of the Power Level Enhancement (PLE) or of the Average Power Level (APL) for a given picture. So, for a full white picture, the number of sustain pulses will be low and for a peak white picture, the number of sustain pulses is high for the same power consumption.
  • PLE Power Level Enhancement
  • APL Average Power Level
  • An example of the number of sustain pulses for each weight in function of the factor is given in the following table. It corresponds to the sub-field weights described above.
  • a specific test pattern is used as shown in Figure 2 .
  • the specific test pattern has been built such that only two different grey levels are used, that two consecutive cells in a line receive sustain pulses corresponding to respectively one grey level and that the corresponding cells of two consecutive lines receive sustain pulses corresponding to respectively one grey level.
  • the two grey levels may be, for example, 170 and 176. How are chosen the value of these grey levels will be explained hereafter. In fact, these two grey levels 170 and 176 have respectively the corresponding digital code word 111111101110 and 111111011110. These two values have been chosen since they have something special together: indeed, all sub-fields are identical except the 7 th and 8 th ones.
  • the value 170 is applied to the first red cell, the value 176 to the first green cell, the value 170 to the first blue cell, the value 176 to the second red cell, the value 170 to the second blue cell and so on.
  • the value 176 is applied to the first red cell, the value 170 to the first green cell, the value 176 to the first blue cell and so on.
  • the control method described above is used.
  • the sub-field weight factor is modified until a response fidelity problems on the border line of the screen appears. This problem is due to a different behaviour between border opened cells and inside closed cells.
  • the number of sustain pulses obtained for the optimised factor is used to determine the sustain threshold value. For instance, let us assume that the first problem appears with a factor 4,4 at the transition between values 170 and 176: this means that the sub-field responsible for the miss-writing is the 7 th having a number of sustain equal to 79 (18 x 4,4), then the sustain threshold is set to 79.
  • This value is stored in a specific table to be used afterward in the method according to the present invention. This value depends on the features of the PDP such as the chosen addressing speed and the panel technology (gas mixture, MgO layer, barrier ribs height, cell size).
  • Figure 3a concerns a full white picture.
  • the weights of the sub-fields are as follows: 1 ⁇ 2 ⁇ 3 ⁇ 5 ⁇ 8 ⁇ 12 ⁇ 18 ⁇ 24 ⁇ 31 ⁇ 40 ⁇ 50 ⁇ 61 and the number of sustain pulses is: 1 ⁇ 1 ⁇ 1 ⁇ 2 ⁇ 3 ⁇ 5 ⁇ 7 ⁇ 10 ⁇ 12 ⁇ 16 ⁇ 20 ⁇ 24 as the sub-field weight factor is 0,4.
  • the number of sustain pulses in each sub-field SF1 to SF12 is calculated and is compared to the sustain threshold value which is 79.
  • Figures 3b to 3d represent the case of picture between full white picture and peak white picture.
  • the number of sustain pulses is increased so that the optimised sub-field weight factor is 1,6.
  • the number of sustain pulses is: 2 ⁇ 3 ⁇ 5 ⁇ 8 ⁇ 13 ⁇ 19 ⁇ 29 ⁇ 38 ⁇ 50 ⁇ 64 ⁇ 80 ⁇ 98.
  • the number of sustain pulses of each sub-field SF1 to SF12 is compared to the sustain threshold value 79. It appears that for the sub-field SF11, the number of sustain pulses 80 is above the sustain threshold value. According to the present invention, a priming pulse P is added before the sub-field SF12.
  • the number of sustain pulses is still increased to obtain a sub-field weight factor of 2.
  • the number of sustain pulses is : 2 ⁇ 4 ⁇ 6 ⁇ 10 ⁇ 16 ⁇ 24 ⁇ 36 ⁇ 48 ⁇ 62 ⁇ 80 ⁇ 100 ⁇ 122.
  • a priming pulse P has to be added on sub-field SF11.
  • another priming pulse P is also added on sub-field SF12, since the SF11 is also above the predetermined threshold as shown in figure 3c .
  • a first priming pulse P is also added at the beginning of the frame.
  • Figure 3d represents the case where a priming P is also added on sub-field SF10 as well as on sub-fields SF11 and SF12. This case corresponds, for example, to a sub-field weight factor of 2,6according to the above table.
  • the number of sustain pulses may be increased up to obtain a peak white picture.
  • more priming operations will be used in order to perform a good response fidelity while keeping a maximal contrast ratio.
  • the maximal number of priming to be added is 6 for a sub-field weight factor between 6,6 and 8,2.
  • the present invention has been described with reference to a mode based on 12 sub-fields.
  • the present invention may be implemented in a PDP with several modes, for example, three modes based on 10, 11 and 12 sub-fields.
  • the user can choose which modes he wants.
  • the PLE circuit will decide how many sustain pulses will be made in general. Nevertheless, with the same number of sustain pulses in total, the number of sustain pulses for each sub-field will change and also the number and the position of priming pulses.
  • the present invention provides a type of dynamic priming system which is adapted to the maximal white luminance for having a good contrast ratio for all picture contents whatever are the power level modes.
  • FIG 4 a circuit implementation of the invention is illustrated.
  • the input video data R, G, B coded on 8-bit standard binary code is applied to a degamma function as well known in the art.
  • the video data RGB is applied to a PLE measurement circuit 11 where the RGB data is analysed and computed to give a PLE value sent to the plasma control block 12.
  • the 8-bitvideo data is also sent to a sub-field coding circuit 13 that receives the appropriate code from a LUT table 121 in the plasma control block 12.
  • a sub-field code word is assigned to each normalised pixel value.
  • the RGB sub-field data SF R , SF G , SF B are sent from the sub-field coding circuit 13 to the serial to parallel conversion circuit 14 and then to the column drivers (data top, data bottom) of the PDP 15.
  • the plasma control circuit 12 comprises a PLE analysis circuit 120 that receives the PLE signal from PLE measurement circuit 11.
  • This circuit 120 provides a filtering and a hysterisis control of the system.
  • the PLE value from the circuit 120 is sent to a LUT table 121 storing various data to realise the selection of appropriate code, the selection of appropriate sustain table and priming table as well as various sub-field code per PLE value as explained above.
  • a specific sub-field encoding table converting 8-bit video data in sub-field codeword is loaded in the block 13 to make the sub-field encoding.
  • the serial to parallel conversion block 14 will load in a memory 16 the various sub-field separately (e.g. 12 different tables of 1 bit). Then during the frame the various sub-field data (1 bit) are send line per line to the data driver.
  • the corresponding priming table located in 121 is read to determine if a priming operation is required or not before sub-field n.
  • the corresponding sustain table is read to send the required number of sustain to sustain generator.

Claims (6)

  1. Procédé pour le traitement de signaux vidéo pour un affichage sur un panneau d'affichage à plasma comprenant un réseau matriciel de cellules pouvant uniquement être « SOUS TENSION » ou « HORS TENSION », où la durée d'une trame vidéo est divisée en N sous-champs pendant lesquels les cellules peuvent être activées, chaque sous-champ comprenant au moins une période d'adressage, une période de maintien et une période d'effacement de longueur fixe dans laquelle la charge des cellules est désactivée, dont la durée correspond à la pondération associée audit sous-champ, ladite trame vidéo comprenant au moins une période d'apprêtage permettant de placer les cellules dans des états homogènes au début de chaque trame, caractérisé en ce que l'ajout d'une période d'apprêtage est déterminé comme suit :
    - détermination d'une valeur D de seuil de maintien pour une vitesse d'adressage et une technologie de panneau données,
    - calcul du nombre d'impulsions de maintien dans chaque sous-champ n, n étant tel que 1 ≤ n ≤ N, et
    - pour au moins un sous champ n avec n s N - 1, ajout d'une période d'apprêtage au début du sous-champ n + 1 uniquement si le nombre d'impulsions de maintien est supérieur ou égal à D.
  2. Procédé selon la revendication 1, caractérisé en ce que, pour chaque sous-champ n avec n ≤ N - 1 et pour lequel le nombre d'impulsions de maintien est supérieur ou égal à D, une période d'apprêtage est ajoutée au début du sous-champ n + 1.
  3. Procédé selon la revendication 1, caractérisé en ce que les valeurs vidéo sont codées avec les sous-champs, de sorte qu'il n'y ait jamais plus d'un sous-champ HORS TENSION entre deux sous-champs SOUS-TENSION.
  4. Procédé selon la revendication 1, caractérisé en ce que la détermination d'une valeur de seuil de maintien est effectuée à l'aide d'une séquence de test spécifique, modifiant le nombre d'impulsions de maintien et déterminant pour quel nombre d'impulsions de maintien un problème de fidélité de réponse est visible, ledit nombre donnant la valeur D de seuil de maintien.
  5. Appareil pour le traitement de signaux vidéo sur un panneau d'affichage à plasma comprenant un réseau matriciel de cellules pouvant uniquement être « SOUS TENSION » ou « HORS TENSION », où la durée d'une trame vidéo est divisée en N sous-champs pendant lesquels les cellules peuvent être activées, chaque sous-champ comprenant au moins une période d'adressage, une période de maintien et une période d'effacement de longueur fixe dans laquelle la charge des cellules est désactivée, dont la durée correspond à la pondération associée audit sous-champ, ladite trame vidéo comprenant au moins une période d'apprétage permettant de placer les cellules dans des états homogènes au début de chaque trame,
    caractérisé en ce qu'il comprend :
    - un moyen permettant de déterminer une valeur D de seuil de maintien pour une vitesse d'adressage et une technologie de panneau données,
    - un moyen permettant de calculer le nombre d'impulsions de maintien dans chaque sous-champ n, n étant tel que 1 ≤ n ≤ N, et
    - un moyen permettant d'ajouter, pour au moins un sous champ n avec n ≤ N - 1 et uniquement si le nombre d'impulsions de maintien est supérieur ou égal à D, une période d'apprêtage au début du sous-champ n + 1.
  6. Appareil selon la revendication 5, caractérisé en ce qu'il comprend en outre une amélioration de luminance de crête, une unité de mesure, une unité de codage de sous-champs et une unité de commande plasma, ladite unité de commande plasma comprenant au moins une table de conversion de codage permettant de stocker différents codes de sous-champ par valeur d'amélioration de luminance de crête donnant la valeur de seuil de maintien, une sélection d'une table de maintien et d'une table d'apprêtage appropriées pour la commande PDP.
EP20030000172 2002-01-16 2003-01-07 Procédé et appareil pour le traitement d'images vidéo Expired - Lifetime EP1335341B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20030000172 EP1335341B1 (fr) 2002-01-16 2003-01-07 Procédé et appareil pour le traitement d'images vidéo

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02000946A EP1329869A1 (fr) 2002-01-16 2002-01-16 Procédé et dispositif de traitement d'images vidéo,
EP02000946 2002-01-16
EP20030000172 EP1335341B1 (fr) 2002-01-16 2003-01-07 Procédé et appareil pour le traitement d'images vidéo

Publications (3)

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EP1335341A2 EP1335341A2 (fr) 2003-08-13
EP1335341A3 EP1335341A3 (fr) 2004-06-30
EP1335341B1 true EP1335341B1 (fr) 2008-10-01

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1553549A1 (fr) * 2004-01-07 2005-07-13 Deutsche Thomson-Brandt GmbH Procédé et dispositif pour le codage spécifique des pixels attribués au contour de l'écran de visualisation d'un afficheur plasma
WO2005073946A1 (fr) * 2004-01-28 2005-08-11 Matsushita Electric Industrial Co., Ltd. Procédé d'entraînement d'écran plasma

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1174850A1 (fr) * 2000-01-26 2002-01-23 Deutsche Thomson-Brandt Gmbh Procédé de traitement d'images vidéo en vue d'un dispositif d'affichage
JP3231569B2 (ja) * 1995-02-13 2001-11-26 日本電気株式会社 プラズマディスプレイパネルの駆動方法および駆動装置
JP3468284B2 (ja) * 1999-06-15 2003-11-17 日本電気株式会社 プラズマディスプレイパネルの駆動方法
JP3738890B2 (ja) * 2000-04-27 2006-01-25 パイオニア株式会社 プラズマディスプレイパネルの駆動方法

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EP1335341A2 (fr) 2003-08-13

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