EP0982708A1 - Méthode et appareil de traitement d'images vidéo, en particulier pour la réduction du scintillement de grande surface - Google Patents

Méthode et appareil de traitement d'images vidéo, en particulier pour la réduction du scintillement de grande surface Download PDF

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Publication number
EP0982708A1
EP0982708A1 EP99115651A EP99115651A EP0982708A1 EP 0982708 A1 EP0982708 A1 EP 0982708A1 EP 99115651 A EP99115651 A EP 99115651A EP 99115651 A EP99115651 A EP 99115651A EP 0982708 A1 EP0982708 A1 EP 0982708A1
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EP
European Patent Office
Prior art keywords
sub
field
fields
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group
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Granted
Application number
EP99115651A
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German (de)
English (en)
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EP0982708B1 (fr
Inventor
Carlos Correa
Rainer Zwing
Sebastien Weitbruch
Gangolf Hirtz
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THOMSON LICENSING
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Deutsche Thomson Brandt GmbH
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Priority claimed from EP98115607A external-priority patent/EP0982707A1/fr
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
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Publication of EP0982708B1 publication Critical patent/EP0982708B1/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
    • G09G3/2033—Display of intermediate tones by time modulation using two or more time intervals using sub-frames with splitting one or more sub-frames corresponding to the most significant bits into two or more 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
    • G09G3/2007—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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
    • 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
    • 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 invention relates to a method and apparatus for processing video pictures, in particular for large area flicker effect reduction. More specifically the invention is closely related to a kind of video processing for improving the picture quality of pictures which are displayed on matrix displays like plasma display panels (PDP), display devices with digital micro mirror arrays (DMD)and all kind of displays based on the principle of duty cycle modulation (pulse width modulation) of light emission.
  • PDP plasma display panels
  • DMD digital micro mirror arrays
  • plasma display panels are known for many years, plasma displays are encountering a growing interest from TV manufacturers. Indeed, this technology now makes it possible to achieve flat colour panels of large size and with limited depths without any viewing angle constraints.
  • the size of the displays may be much larger than the classical CRT picture tubes would have ever been allowed.
  • a plasma display panel utilises a matrix array of discharge cells which could only be switched ON or OFF. Also unlike a CRT or LCD in which grey levels are expressed by analogue control of the light emission, in a PDP the grey level is controlled by modulating the number of light pulses per frame. This time-modulation will be integrated by the eye over a period corresponding to the eye time response. For static pictures, this time-modulation, repeats itself, with a base frequency equal to the frame frequency of the displayed video norm. As known from the CRT-technology, a light emission with base frequency of 50 Hz, introduces large area flicker, which can be eliminated by field repetition in 100Hz CRT TV receivers.
  • the duty cycle of light emission in PDPs is ⁇ 50% for middle grey. This reduces the amplitude of the 50Hz frequency component in the spectrum, and thus large area flicker artefact, but due to the larger size of PDPs, with a larger viewing angle, even a reduced large area flicker becomes objectionable in terms of picture quality.
  • the present trend of increasing size and brightness of PDPs will also contribute to aggravate this problem in the future.
  • the reduction of the large area effect is made by utilising an optimised sub-field organisation for the frame period.
  • the sub-fields of a pixel are organised in two consecutive groups, and to a value of a pixel a code word is assigned which distributes the active sub-field periods equally over the two sub-field groups.
  • a vertical blanking period has also to be used where no sub-field is addressed (see claim 4).
  • this vertical blanking period is replaced by two vertical blanking periods, inserted between every pair of consecutive sub-field groups. This is similar to what happens in 100Hz CRT based TV receivers.
  • the concrete sub-field organisation claimed in claim 5 is advantageous for 50Hz video norms. Compared to an optimised sub-field organisation for the 60 Hz video norms, like NTSC, there are more sub-fields used which is easily possible, because the frame period is longer.
  • the frame period will be divided in 8 lighting periods which are also very often referred to sub-fields, each one corresponding to one of the 8 bits.
  • the grey level 92 will thus have the corresponding digital code word %1011100.
  • the sub-fields may consist of a number of small pulses with equal amplitude and equal duration. Without motion, the eye of the observer will integrate over about a frame period all the sub-periods and will have the impression of the right grey level.
  • the above-mentioned sub-field organisation is shown in Fig. 1.
  • Fig. 2 An example of a commonly used sub-field organisation for 60Hz video standards is shown in Fig. 2.
  • the sub-field number has been increased to 12 sub-fields SF.
  • the relative duration of the sub-fields are given in Fig. 2.
  • the lighting phase has a relative duration of 255 relative time units.
  • the value of 255 has been selected in order to be able to continue using the above mentioned 8 bit representation of the luminance level or RGB data which is being used for PDPs.
  • the seven most significant sub-fields have a relative duration of 32 relative time units.
  • the relative duration of a sub-field is often referred to the 'weight' of a sub-field, the expression will also be used hereinafter.
  • each sub-field SF there is a small time period in which no light is emitted. This time period is used for the addressing of the corresponding plasma cells. After the last sub-field a longer time period where no light is emitted is added. This time period corresponds to the vertical blanking period of the video standard. The implementation of such a vertical blanking period is necessary in order to be able to handle non-standard video signals generated in VCR's or video games, etc.
  • a digital representation of the grey level 92 in this subfield organisation is e.g. 000001111100.
  • This figure is a 12 bit binary number corresponding to the 12 sub-fields. It will be used to control the lighting pulses for the corresponding pixel during a frame period. It should be noted, that there exist a few other possible 12 bit code words for the same grey level, due to the fact that there are seven sub-fields width identical weight.
  • Fig. 3 a new sub-field organisation according to the invention is shown for 50Hz video standards.
  • the frame period for 60Hz video standards is 16.6ms and for 50Hz 20ms and thus larger for 50Hz video standards. This allows for the addressing of more sub-fields in 50Hz video standards.
  • the number of sub-fields has been increased to 14. This does not cause extra costs since the added time to the frame period is greater than the added number of sub-fields: (20.0/16.6) > (14/12).
  • the sub-fields are structured in two separate sub-field groups G1, G2.
  • One vertical frame blanking period has been replaced by two vertical frame blanking periods VFB1, VFB2, one at the end of the frame period and the other between the two sub-field groups.
  • the 2 sub-field groups are identical in terms of the six most significant sub-fields and different in terms of the least significant sub-field.
  • the weight of the least significant sub-field is small and does not introduce significant large area flicker, and this is the reason why it is not necessary that they are also identical.
  • a sub-field coding process that distributes luminance weight of a given pixel value symmetrically over the 2 sub-field groups is also applied.
  • a small difference in luminance weight between the 2 sub-field groups means a small 50 Hz luminance frequency component, and thus small levels of large area flicker.
  • For the sub-field coding process there is no need of a complicated calculation.
  • a corresponding table where the code words for the 256 different grey levels/pixel values are stored can be used.
  • the coding process can best be explained with an example.
  • the second and third component, which must be multiples of 4 (because of the fact that the six most significant sub-fields in both groups have weights which are multiples of four) are made as equal as possible. If they cannot be made equal, as this is the case with 87 , the second component, to be coded with the sub-fields of group 1, should be made greater by 4.
  • 44 is to be coded with the sub-fields of group G1
  • 40 is to be coded with the sub-fields of group 2.
  • the difference in weight between the two sub-field groups is never greater than 5.
  • FIG. 4 An apparatus according to the invention is shown in Fig. 4.
  • the apparatus may be integrated together with the PDP matrix display. It could also be in a separate box which is to be connected with the plasma display panel.
  • Reference no. 10 denotes the whole apparatus.
  • the video signal is fed to the apparatus via the input line V in .
  • Reference no. 11 video processing unit wherein the video signal is digitalized and Y,U, V data is produced.
  • interlace video standards require a previous conversion, here.
  • an YUV/RGB data conversion will be made in this unit as the PDPs work with RGB data.
  • the generated RGB data is forwarded to the sub-field coding unit 12. Therein, to each RGB pixel value the corresponding code word will be selected from a table 13.
  • These code words are forwarded to the frame memory in addressing unit 14 of the PDP 10. With these data the addressing unit 14 controls the plasma display 15.

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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)
  • Transforming Electric Information Into Light Information (AREA)
EP99115651A 1998-08-19 1999-08-07 Méthode et appareil de traitement d'images vidéo, en particulier pour la réduction du scintillement de grande surface Expired - Lifetime EP0982708B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99115651A EP0982708B1 (fr) 1998-08-19 1999-08-07 Méthode et appareil de traitement d'images vidéo, en particulier pour la réduction du scintillement de grande surface

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP98115607 1998-08-19
EP98115607A EP0982707A1 (fr) 1998-08-19 1998-08-19 Méthode et appareil de traitement d'images vidéo, en particulier pour la réduction du scintillement de grande surface
EP99115651A EP0982708B1 (fr) 1998-08-19 1999-08-07 Méthode et appareil de traitement d'images vidéo, en particulier pour la réduction du scintillement de grande surface

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EP0982708A1 true EP0982708A1 (fr) 2000-03-01
EP0982708B1 EP0982708B1 (fr) 2011-05-11

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002097777A2 (fr) * 2001-05-29 2002-12-05 Koninklijke Philips Electronics N.V. Unite de commande d'affichage, procede d'affichage de pixels et appareil d'affichage comprenant ladite unite de commande
EP1267321A2 (fr) * 2001-06-15 2002-12-18 Pioneer Corporation Panneau d'affichage et procédé de commande dudit panneau
FR2830362A1 (fr) * 2001-09-28 2003-04-04 Nec Corp Circuit de commande et procede de commande de dispositif d'affichage d'image
EP1359749A1 (fr) * 2002-05-04 2003-11-05 Deutsche Thomson-Brandt Gmbh Mode d'affichage à balayage multiple pour un panneau d'affichage à plasma
EP1359564A2 (fr) * 2002-05-04 2003-11-05 Thomson Licensing S.A. Affichage à balayage multiple sur un panneau d'affichage à plasma
KR20040006576A (ko) * 2002-07-12 2004-01-24 엘지전자 주식회사 플라즈마 디스플레이 패널의 구동방법
KR100445029B1 (ko) * 2002-01-07 2004-08-21 삼성에스디아이 주식회사 파알(ｐ．ａ．ｌ) 형식의 영상 신호들을 디스플레이하기위한 플라즈마 디스플레이 패널의 구동 방법
EP1544836A1 (fr) * 2003-12-17 2005-06-22 Deutsche Thomson-Brandt GmbH Procédé et dispositif de traitement de données video qui contiennent séquences en mode Film
EP1679679A1 (fr) * 2005-01-06 2006-07-12 Thomson Licensing, S.A. Procédé et appareil pour le traitement d'images vidéo, en particulier pour la réduction de l'effet de scintillement et de l'effet de faux contour sur des surfaces de grandes dimensions
EP1679680A1 (fr) * 2005-01-06 2006-07-12 Deutsche Thomson-Brandt Gmbh Procédé et dispositif pour la réduction du scintellement de grande surface d'images vidéo
KR100610494B1 (ko) 2005-03-03 2006-08-08 엘지전자 주식회사 플라즈마 디스플레이 패널에서의 노이즈 저감 장치 및 그방법
KR100667539B1 (ko) 2005-04-07 2007-01-12 엘지전자 주식회사 플라즈마 디스플레이 장치 및 그의 구동 방법
KR100667540B1 (ko) * 2005-04-07 2007-01-12 엘지전자 주식회사 플라즈마 디스플레이 장치 및 그의 구동 방법
US7187392B2 (en) 2002-06-28 2007-03-06 Seiko Epson Corporation Method of driving electro-optical device, electro-optical device, and electronic apparatus
EP1758072A3 (fr) * 2005-08-24 2007-05-02 Semiconductor Energy Laboratory Co., Ltd. Dispositif d'affichage et son méthode de commande
EP1801769A1 (fr) * 2005-12-20 2007-06-27 Deutsche Thomson-Brandt Gmbh Procédé et dispositif pour le traitement d'images vidéo
KR20070087703A (ko) * 2005-04-07 2007-08-29 엘지전자 주식회사 플라즈마 디스플레이 패널, 장치, 패널의 구동 장치 및구동 방법
EP1918902A1 (fr) * 2006-11-03 2008-05-07 Lg Electronics Inc. Appareil d'affichage à plasma
CN100394467C (zh) * 2000-11-30 2008-06-11 汤姆森许可贸易公司 用于控制显示装置的方法和设备
CN1855195B (zh) * 2005-04-19 2010-05-12 三星Sdi株式会社 用于驱动等离子体显示板的方法
CN101951490A (zh) * 2009-12-31 2011-01-19 四川虹欧显示器件有限公司 提高显示图像质量的方法、装置和等离子显示器
CN102074185A (zh) * 2009-12-31 2011-05-25 四川虹欧显示器件有限公司 等离子显示器的图像信号的处理方法及装置
US7965260B2 (en) * 2006-03-07 2011-06-21 Lg Electronics Inc. Plasma display apparatus
US9449543B2 (en) 2005-07-04 2016-09-20 Semiconductor Energy Laboratory Co., Ltd. Display device and driving method of display device

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US5187578A (en) 1990-03-02 1993-02-16 Hitachi, Ltd. Tone display method and apparatus reducing flicker
JPH05127612A (ja) 1991-11-05 1993-05-25 Nippon Hoso Kyokai <Nhk> 中間調画像表示方法
EP0774745A2 (fr) * 1995-11-17 1997-05-21 Matsushita Electronics Corporation Méthode et dispositif de commande d'un appareil d'affichage à niveaux de gris
EP0838799A1 (fr) * 1996-10-23 1998-04-29 Nec Corporation Système d'affichage à niveaux de gris

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JP3712802B2 (ja) * 1996-10-29 2005-11-02 富士通株式会社 中間調表示方法および表示装置

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US5187578A (en) 1990-03-02 1993-02-16 Hitachi, Ltd. Tone display method and apparatus reducing flicker
JPH05127612A (ja) 1991-11-05 1993-05-25 Nippon Hoso Kyokai <Nhk> 中間調画像表示方法
EP0774745A2 (fr) * 1995-11-17 1997-05-21 Matsushita Electronics Corporation Méthode et dispositif de commande d'un appareil d'affichage à niveaux de gris
EP0838799A1 (fr) * 1996-10-23 1998-04-29 Nec Corporation Système d'affichage à niveaux de gris

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100394467C (zh) * 2000-11-30 2008-06-11 汤姆森许可贸易公司 用于控制显示装置的方法和设备
US7773161B2 (en) * 2000-11-30 2010-08-10 Thomson Licensing Method and apparatus for controlling a display device
WO2002097777A2 (fr) * 2001-05-29 2002-12-05 Koninklijke Philips Electronics N.V. Unite de commande d'affichage, procede d'affichage de pixels et appareil d'affichage comprenant ladite unite de commande
WO2002097777A3 (fr) * 2001-05-29 2004-01-15 Koninkl Philips Electronics Nv Unite de commande d'affichage, procede d'affichage de pixels et appareil d'affichage comprenant ladite unite de commande
EP1267321A2 (fr) * 2001-06-15 2002-12-18 Pioneer Corporation Panneau d'affichage et procédé de commande dudit panneau
EP1267321A3 (fr) * 2001-06-15 2008-02-27 Pioneer Corporation Panneau d'affichage et procédé de commande dudit panneau
FR2830362A1 (fr) * 2001-09-28 2003-04-04 Nec Corp Circuit de commande et procede de commande de dispositif d'affichage d'image
KR100445029B1 (ko) * 2002-01-07 2004-08-21 삼성에스디아이 주식회사 파알(ｐ．ａ．ｌ) 형식의 영상 신호들을 디스플레이하기위한 플라즈마 디스플레이 패널의 구동 방법
EP1359749A1 (fr) * 2002-05-04 2003-11-05 Deutsche Thomson-Brandt Gmbh Mode d'affichage à balayage multiple pour un panneau d'affichage à plasma
EP1359564A3 (fr) * 2002-05-04 2004-10-13 Thomson Licensing S.A. Affichage à balayage multiple sur un panneau d'affichage à plasma
US7609235B2 (en) 2002-05-04 2009-10-27 Thomson Licensing Multiscan display on a plasma display panel
EP1359564A2 (fr) * 2002-05-04 2003-11-05 Thomson Licensing S.A. Affichage à balayage multiple sur un panneau d'affichage à plasma
US7982754B2 (en) 2002-06-28 2011-07-19 Seiko Epson Corporation Method of driving electro-optical device, electro-optical device, and electronic apparatus
US7187392B2 (en) 2002-06-28 2007-03-06 Seiko Epson Corporation Method of driving electro-optical device, electro-optical device, and electronic apparatus
KR20040006576A (ko) * 2002-07-12 2004-01-24 엘지전자 주식회사 플라즈마 디스플레이 패널의 구동방법
EP1544836A1 (fr) * 2003-12-17 2005-06-22 Deutsche Thomson-Brandt GmbH Procédé et dispositif de traitement de données video qui contiennent séquences en mode Film
WO2005059878A2 (fr) * 2003-12-17 2005-06-30 Thomson Licensing Procede et appareil permettant de traiter des images video, notamment dans des sequences en mode film
KR101023670B1 (ko) * 2003-12-17 2011-03-25 톰슨 라이센싱 특히 필름 모드의 시퀀스에서 비디오 화상을 처리하기 위한 방법과 장치
US7911545B2 (en) 2003-12-17 2011-03-22 Thomson Licensing Method and apparatus for processing video pictures, in particular in film mode sequences
WO2005059878A3 (fr) * 2003-12-17 2005-09-22 Thomson Licensing Sa Procede et appareil permettant de traiter des images video, notamment dans des sequences en mode film
EP1679680A1 (fr) * 2005-01-06 2006-07-12 Deutsche Thomson-Brandt Gmbh Procédé et dispositif pour la réduction du scintellement de grande surface d'images vidéo
CN1828699B (zh) * 2005-01-06 2012-02-22 汤姆森特许公司 处理视频画面、具体地是减少错误轮廓效应的方法和设备
EP1679679A1 (fr) * 2005-01-06 2006-07-12 Thomson Licensing, S.A. Procédé et appareil pour le traitement d'images vidéo, en particulier pour la réduction de l'effet de scintillement et de l'effet de faux contour sur des surfaces de grandes dimensions
KR100610494B1 (ko) 2005-03-03 2006-08-08 엘지전자 주식회사 플라즈마 디스플레이 패널에서의 노이즈 저감 장치 및 그방법
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