WO2002061722A1 - Procede d'affichage d'images video sur panneau d'affichage a plasma et panneau d'affichage a plasma correspondant - Google Patents
Procede d'affichage d'images video sur panneau d'affichage a plasma et panneau d'affichage a plasma correspondant Download PDFInfo
- Publication number
- WO2002061722A1 WO2002061722A1 PCT/FR2002/000195 FR0200195W WO02061722A1 WO 2002061722 A1 WO2002061722 A1 WO 2002061722A1 FR 0200195 W FR0200195 W FR 0200195W WO 02061722 A1 WO02061722 A1 WO 02061722A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sub
- scans
- sfn
- motion vector
- plasma display
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000010354 integration Effects 0.000 claims abstract description 35
- 230000002123 temporal effect Effects 0.000 claims abstract description 9
- 239000013598 vector Substances 0.000 claims description 33
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 230000005484 gravity Effects 0.000 claims description 3
- 230000001788 irregular Effects 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 15
- 230000007704 transition Effects 0.000 description 10
- 230000006870 function Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 206010021033 Hypomenorrhoea Diseases 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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
-
- 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
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
-
- 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
- G09G3/2803—Display of gradations
-
- 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
- G09G2320/00—Control of display operating conditions
- G09G2320/10—Special adaptations of display systems for operation with variable images
- G09G2320/106—Determination of movement vectors or equivalent parameters within the image
Definitions
- the present invention relates to a method of displaying video images on a plasma display panel.
- the invention finds more particularly its application in plasma display panels (PAP) comprising an array of elementary cells which can take either an on state or an off state.
- PAP plasma display panels
- the PAP generally comprise two insulating slabs delimiting between them a space filled with gas in which are defined elementary spaces delimited by barriers. Each slab is provided with one or more networks of electrodes.
- An elementary cell corresponds to an elementary space provided on either side of said elementary space with at least one electrode.
- To activate an elementary cell an electrical discharge is caused in the corresponding elementary space by applying a voltage between the electrodes of the cell. The electric discharge then causes an emission of UV rays in the elementary cell.
- Luminophores deposited on the cell walls transform UV into visible light.
- the operating period of an elementary cell of a PAP corresponds to the display period of a video image. Each display period is made up of elementary periods commonly called sub-scans.
- Each underscan has a cell addressing period and a holding period.
- the addressing period consists in sending or not an electrical pulse to the elementary cell depending on whether the latter must be positioned in an on or off state.
- the maintenance period consists of sending a succession of pulses for a given period of time to keep the cell in an on or off state.
- Each subscanning has a maintenance period of its own duration.
- the holding periods are distributed over the entire display period and correspond to periods of illumination of the cell. The human eye then integrates these light periods to recreate the corresponding gray level.
- the display period of an image is called in the following description of the time integration window.
- FIG. 1 represents the sub-scans for two consecutive images I and 1 + 1.
- FIG. 1 corresponds to a worst-case situation which includes a transition between a gray level 127 and a gray level 128. This transition moves 4 pixels between image I and image 1 + 1.
- the ordinate axis represents the time axis and the abscissa axis represents the pixels of the different images.
- the integration made by the eye amounts to integrating temporally along the oblique lines shown in the figure because the eye tends to follow the moving object. It therefore integrates information from different pixels.
- the result of the integration results in the appearance of a gray level equal to zero at the time of the transition between the gray levels 127 and 128. This passage through the zero gray level causes a dark band to appear at the level of the transition. In the opposite case, if the transition passes from level 128 to level 127, a level 255 corresponding to a light band appears at the time of the transition.
- a first known solution consists in "breaking" the high weights of the sub-scans to reduce the integration error.
- FIG. 2 represents the same transition as FIG. 1 but with seven sub-scans of weight 32 in place of the three sub-scans of weights 32, 64 and 128. The integration error is then at most a value with a gray level equal to 32.
- this correction consists in spatially displacing the sub-scans as a function of the movements observed between the images so as to anticipate the integration that the human eye will perform.
- the subscans are moved differently depending on their time position in the time integration window. This correction gives excellent results on transitions which cause false contour effects.
- FIG. 4 shows vectors representative of the movement between an image 1-1 and an image I calculated with a motion estimator of the state of the art.
- a motion vector is calculated for each pixel of image I.
- Each motion vector normally has a horizontal component and a vertical component corresponding to the horizontal and vertical displacement of a point between the two images.
- the image is represented, as previously, only on a spatial dimension by the horizontal axis of the figure, the vertical axis representing time.
- the display of image I is done using 9 sub-scans, denoted SF1 to SF9 arranged in ascending order of their weights.
- each motion vector defines the direction, the direction and the amplitude of the movement of a pixel between image 1-1 and image I. It should be noted however that, image I being represented only on a spatial dimension, it is not possible to represent the direction of the motion vectors but only their direction and their amplitude
- the sub-scans of the image I are displaced in the direction of the motion vectors, the amplitude of the displacement of a sub-scan being a function of its time position in window 0 of time integration.
- the sub-scans of a pixel of image I are moved in the opposite direction to the motion vector considered since the motion vector associated with the pixel of image I is representative of the motion between image 1-1 and l image I.
- the conflict zone 1 is characterized by the crossing of two motion vectors 0 imposing two different displacements in the underscan considered for a given pixel in this area.
- the hole area 2 is characterized by the absence of information for the underscans of this area.
- An object of the invention is therefore to reduce the size of these zones of holes and conflicts.
- the invention relates to a method for displaying video images on a plasma display panel comprising a plurality of elementary cells in which the gray levels are obtained by time integration over a period called the time integration window comprising a plurality of sub-scans during which each elementary cell of said plasma display panel is either on or off, characterized in that it comprises the following steps:
- the movement of said video image to be displayed is estimated with respect to the previous video image so as to generate a motion vector for each pixel of the video image to be displayed
- a reference instant placed inside the time integration window is defined, - for each pixel of the video image to be displayed, the sub-scans are moved relative to the reference instant so that the offset between the first and the last subscanning is substantially equal to the amplitude of the associated motion vector, the amplitude of the displacement of each subscanning being a function of its time position by relation to the reference instant in the window of temporal integration and of the direction of the associated motion vector.
- This process makes it possible to reduce the maximum amplitude of displacement of the sub-scans and thereby reduce the number of holes and conflicts in the time integration window.
- a reference sub-scan coincides with the reference instant, the reference sub-scan being different from the first or the last sub-scan of said plurality of sub-scans.
- the reference underscan is not moved.
- the other subscans are moved either in the direction of the associated motion vector, or in the opposite direction. This avoids calculations on displacement for a sub-scan.
- the reference underscan is close to the middle of the time integration window.
- the invention also relates to a plasma display panel characterized in that it comprises a device implementing the method for displaying video images of the invention.
- FIG. 6 shows an example of a device for implementing the method of the invention.
- Figures 1 to 4 already described in the preamble to this description, will not be detailed again.
- the motion compensation of an image I has consisted in moving the sub-scans of each pixel in a direction and a direction defined by the associated motion vector. All the subscans were moved in the same direction, namely in the opposite direction to the motion vector as in FIG. 4. According to the invention, it is proposed to move the subscans with respect to a reference subscanning other than SF1 or SF9. Part of the sub-scans is then moved in the direction of the motion vector calculated for the pixel considered and another part of the sub-scans is moved in the opposite direction. The process of the invention is illustrated in FIG. 5. As in FIG.
- the arrows in solid line represent the motion vectors associated with the pixels of the video frame of image I representative of the motion between the images 1-1 and I.
- a reference sub-scanning, SF6 in the present case is defined for which the pixels of the image I will not be displaced. This is why, in FIG. 5, the video frame of image I is placed at the level of the sub-scanning SF6 of the time integration window of image I. Similarly, the video frame of image 1-1 is placed at the level of the sub-scanning SF6 of the time integration window of the image 1-1.
- the sub-scans consecutive to the reference sub-scan SF6 are displaced, namely the sub-scans SF7 to SF9, in the direction of the motion vector associated with the pixel considered. and the sub-scans preceding the reference sub-scan SF6, namely the sub-scans SF1 to SF5, are moved in the opposite direction.
- the offset between the subscan SF1 and the subscan SF9 must be substantially equal to the amplitude of the motion vector.
- the amplitude of the displacement of each subscanning is as a function of its time position relative to the reference underscan.
- FIG. 5 The more temporally distant the sub-scans from the reference sub-scan, the more they are spatially displaced.
- two large arrows indicate the direction of movement of the sub-sweeps.
- the large up arrow indicates that the sub-scans SF1, SF2, SF3, SF4 and SF5 are moved in the opposite direction to the motion vector and the large down arrow indicates that the sub-scans SF7, SF8 and SF9 are shifted in the direction of the motion vector.
- Arrows in dotted lines extending the vectors representative of the movement between 1-1 and I are represented in FIG. 5 to illustrate the displacement of the sub-scans SF7 to SF9.
- the amplitude of the displacement of a sub-scan with respect to the reference sub-scan is calculated as a function of its time position relative to the reference sub-scan in the time integration window and of the amplitude of the vector. movement considered.
- the temporal position of the center of gravity of the subscan SFn designates the temporal position of the middle of the period of maintenance of the subscan SFn.
- the difference between the time position of the center of gravity of the sub-scanning SFn and that of the reference sub-scanning is for example equal to M milliseconds.
- the duration of the time integration window is N milliseconds with M ⁇ N.
- this method makes it possible to reduce the number of holes and conflicts in the time integration window.
- the holes are now divided into two reduced areas. The same is true for conflicts.
- a reference sub-scanning has been chosen located around the middle of the time integration window in order to optimize the overall reduction in holes and conflicts.
- the number of holes and conflicts is approximately halved.
- the position of the reference sub-scan can vary depending on the distribution of the different lighting weights of the sub-scans. It goes without saying that the reference sub-scanning can be located elsewhere than around the middle of said time integration window.
- a variant consists in not taking a reference sub-scan but in taking only a reference instant situated between two sub-scans. In this case all the sub-scans are moved.
- the preferred example uses a reference underscan as this avoids having to perform displacement calculations for said reference underscan.
- An image memory 10 receives a stream of images to be memorized. The size of the memory makes it possible to memorize at least 3 images, the image 1 + 1 being memorized during the processing of image I using image 1-1.
- a synchronization circuit 15 is provided for synchronizing the control circuits 12 and 13. This structure is given only by way of illustration.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Plasma & Fusion (AREA)
- Power Engineering (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-7009563A KR20030074719A (ko) | 2001-01-31 | 2002-01-18 | 플라즈마 디스플레이 패널 상에 비디오 이미지를디스플레이하는 방법, 및 이에 대응하는 플라즈마디스플레이 패널 |
JP2002561812A JP2004518997A (ja) | 2001-01-31 | 2002-01-18 | プラズマディスプレイパネルにビデオ画像を表示する方法及び対応するプラズマディスプレイパネル |
EP02712000A EP1356444A1 (fr) | 2001-01-31 | 2002-01-18 | Procede d'affichage d'images video sur panneau d'affichage a plasma et panneau d'affichage a plasma correspondant |
US10/470,563 US20040046716A1 (en) | 2001-01-31 | 2002-01-18 | Method for displaying video images on a plasma display panel and corresponding plasma display panel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0101459A FR2820236B1 (fr) | 2001-01-31 | 2001-01-31 | Procede d'affichage d'images video sur panneau d'affichage a plasma et panneau d'affichage a plasma correspondant |
FR01/01459 | 2001-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002061722A1 true WO2002061722A1 (fr) | 2002-08-08 |
Family
ID=8859578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/000195 WO2002061722A1 (fr) | 2001-01-31 | 2002-01-18 | Procede d'affichage d'images video sur panneau d'affichage a plasma et panneau d'affichage a plasma correspondant |
Country Status (7)
Country | Link |
---|---|
US (1) | US20040046716A1 (fr) |
EP (1) | EP1356444A1 (fr) |
JP (1) | JP2004518997A (fr) |
KR (1) | KR20030074719A (fr) |
CN (1) | CN1488130A (fr) |
FR (1) | FR2820236B1 (fr) |
WO (1) | WO2002061722A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5141043B2 (ja) * | 2007-02-27 | 2013-02-13 | 株式会社日立製作所 | 画像表示装置および画像表示方法 |
KR20090037084A (ko) * | 2007-10-11 | 2009-04-15 | 삼성전자주식회사 | 영상신호처리장치 및 그의 영상신호처리방법 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0973147A1 (fr) * | 1997-03-31 | 2000-01-19 | Matsushita Electronics Corporation | Procede de visualisation du premier plan d'images et dispositif connexe |
EP0978817A1 (fr) * | 1998-08-07 | 2000-02-09 | Deutsche Thomson-Brandt Gmbh | Procédé et appareil pour le traitement d'images vidéo, en particulier pour la compensation de l'effet de faux contours |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001001382A1 (fr) * | 1999-06-28 | 2001-01-04 | Koninklijke Philips Electronics N.V. | Affichage commande par un sous-champ |
-
2001
- 2001-01-31 FR FR0101459A patent/FR2820236B1/fr not_active Expired - Fee Related
-
2002
- 2002-01-18 EP EP02712000A patent/EP1356444A1/fr not_active Withdrawn
- 2002-01-18 US US10/470,563 patent/US20040046716A1/en not_active Abandoned
- 2002-01-18 WO PCT/FR2002/000195 patent/WO2002061722A1/fr not_active Application Discontinuation
- 2002-01-18 CN CNA028039521A patent/CN1488130A/zh active Pending
- 2002-01-18 KR KR10-2003-7009563A patent/KR20030074719A/ko not_active Application Discontinuation
- 2002-01-18 JP JP2002561812A patent/JP2004518997A/ja not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0973147A1 (fr) * | 1997-03-31 | 2000-01-19 | Matsushita Electronics Corporation | Procede de visualisation du premier plan d'images et dispositif connexe |
EP0978817A1 (fr) * | 1998-08-07 | 2000-02-09 | Deutsche Thomson-Brandt Gmbh | Procédé et appareil pour le traitement d'images vidéo, en particulier pour la compensation de l'effet de faux contours |
Also Published As
Publication number | Publication date |
---|---|
FR2820236A1 (fr) | 2002-08-02 |
US20040046716A1 (en) | 2004-03-11 |
FR2820236B1 (fr) | 2004-06-18 |
KR20030074719A (ko) | 2003-09-19 |
CN1488130A (zh) | 2004-04-07 |
EP1356444A1 (fr) | 2003-10-29 |
JP2004518997A (ja) | 2004-06-24 |
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