EP1342226B1 - Bildschirm mit leuchtstoff - Google Patents

Bildschirm mit leuchtstoff Download PDF

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Publication number
EP1342226B1
EP1342226B1 EP01963101A EP01963101A EP1342226B1 EP 1342226 B1 EP1342226 B1 EP 1342226B1 EP 01963101 A EP01963101 A EP 01963101A EP 01963101 A EP01963101 A EP 01963101A EP 1342226 B1 EP1342226 B1 EP 1342226B1
Authority
EP
European Patent Office
Prior art keywords
image
phosphor
intermediate image
types
type
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
EP01963101A
Other languages
English (en)
French (fr)
Other versions
EP1342226A2 (de
Inventor
Didier Doyen
Jonathan Kervec
Herbert Hoelzemann
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.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
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
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP1342226A2 publication Critical patent/EP1342226A2/de
Application granted granted Critical
Publication of EP1342226B1 publication Critical patent/EP1342226B1/de
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
    • 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
    • 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
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/106—Determination of movement vectors or equivalent parameters within the image
    • 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
    • G09G2340/06—Colour space transformation
    • 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
    • G09G3/22—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 invention relates to a display device using luminescent materials for displaying the points of an image.
  • the invention is more particularly applicable to plasma display panels as well as cathode ray tubes using high scanning frequencies.
  • Plasma display panels (PDPs) and cathode ray tubes (CRT) have on their front face a layer of luminescent material that transforms either UV radiation or electron radiation into visible light radiation.
  • the luminescent material is commonly called phosphor.
  • the same phosphor is used on the entire front face of the CRT or PDP.
  • three types of phosphor of different colors are generally used to produce a color synthesis.
  • phosphors of different colors have some operating disparities due to the intrinsic characteristics of the materials constituting the phosphors. Among the disparities in operation, the temporal response to an excitation is specific to each type of phosphor.
  • the figure 1 represents phosphor reaction timelines commonly used in PDPs.
  • the Figure 1A represents an excitation time during which electrical discharges are sent into the panel in order to produce unrepresented UV radiation. The UV radiation is then transformed into visible light by the phosphors.
  • the figure 1 B represents the luminous rendering for a blue phosphor, for example a barium and magnesium aluminate doped with divalent europium.
  • the figure 1C represents the light rendering for a color phosphor red, for example a Yttrium Borate doped with trivalent Europium.
  • the figure 1D represents the light rendering for a green phosphor, for example a Manganese-doped Barium Aluminate.
  • the Figures 1B to 1D have different vertical scales that match the maximum values of each curve.
  • the maximum value of blue color is about 4.3 times higher than the maximum value of red color and about 5.5 times higher than the maximum value of green color.
  • the luminous energy efficiency is substantially the same for each of the colors.
  • the figure 1E represents on the one hand the luminous renditions of the three colors with the same scale of luminous intensity and on the other hand the sum of the three luminous renderings which corresponds to a pixel seen by the human eye. If we look at the color corresponding to the sum of the three renderings, we see that the pixel is first blue, then changes from blue to white (or gray depending on intensity), then changes from white to yellow (combination of green and red of substantially the same intensity), and finally changes from yellow to green before going out. In PDPs, discharges are repeated cyclically at the refresh rate of the screen.
  • the retinal persistence of the human eye performs a low-pass type filtering on the color variations that mask this defect.
  • a white object moving on a black background is for example affected by a leading edge of blue color and a trailing edge of yellow color (the green is found to be not perceptible by the human eye in our example).
  • the invention aims to correct this lack of visualization by image processing.
  • the invention is a method of displaying a sequence of video images on a phosphor device comprising at least two types of phosphors.
  • at least one intermediate image is calculated between two successive images, then one of the two successive images is visualized on at least one type of phosphor and at least one other type of phosphor is imaged on the intermediate image.
  • the intermediate image is calculated with motion compensation
  • the two successive images are a current image and a previous image, and in that the intermediate image corresponds to a lagging image on the current image of a duration defined as a function of the types of phosphor.
  • the defined duration is calculated by making the difference between the moments corresponding to the average light emission centers of gravity of the at least two types of phosphor.
  • the invention is also a video sequence display device comprising at least two types of phosphor, said device comprising means for calculating at least one intermediate image placed between two successive images and means for displaying on one of the types of phosphor the intermediate image and on the other type of phosphor one of the successive images.
  • the information to be displayed is shifted.
  • blue phosphors have a much lower remanence time than red or green type phosphors
  • red type phosphors have a lower remanence time than green type phosphors.
  • the visual information displayed corresponds to the image I for the green color and to two intermediate images for the blue and red colors.
  • the calculation of the intermediate image can be done according to different techniques. Those skilled in the art can refer to the publications relating to the image calculations implemented to make the change of the image frequency 50 / 60Hz or 50 / 100Hz.
  • the intermediate image is as close as possible to the image that should be viewed at this time, particularly with regard to moving objects.
  • the intermediate image must be calculated with motion compensation.
  • the compensation in motion is done according to a known technique.
  • Motion vectors 1 are calculated from images 1 and I-1 so that each pixel (composed of the three colors) corresponds to one vector 1, as represented on the figure 3 .
  • the intermediate image is calculated by determining the value of each pixel by associating it with the weighted value of the pixels 3 and 4 of the images I and I-1 pointed by an extrapolated vector 2 which passes through the pixel of the intermediate image to be calculated.
  • intermediate pixel ( pixel 3 ) ⁇ ( tt - Sorting ) + ( pixel 4 ) ⁇ Sorting / tt , with Tt the time separating two images and Sort the duration separating the current image from the intermediate image.
  • the extrapolated vector 2 is for example the mean vector corresponding to the nearest vectors 1.
  • the extrapolated vector 2 points between several pixels of the image 1, then the corresponding pixel of the intermediate image corresponds to the average of the nearest pixels.
  • the time Tri separating the image 1 and the intermediate image is large enough to make a correction but not too important so as not to reverse the visualization fault. It seems quite difficult to precisely determine the ideal time Tri.
  • a simple calculation method giving an effective result consists in calculating the instant corresponding to the mean center of gravity of light emission for each type of phosphor in its environment of use.
  • the time Tri corresponds to the difference between the instant corresponding to the center of gravity of the slowest phosphor and the instant corresponding to the center of gravity of the phosphor associated with the intermediate image.
  • Tr1 4 ms
  • TR2 0.5 ms.
  • center of gravity of light emission it is necessary to understand the moment after the excitation of the luminophore which corresponds to the emission of half of the luminous energy.
  • center of gravity it is necessary to understand the average of the centers of gravity corresponding to different conditions of excitation. Indeed the center of gravity varies according to the duration and intensity of excitation. The average of the centers of gravity can for example be made from the extreme cases of condition of use.
  • the figure 4 represents an exemplary embodiment of a plasma display panel implementing the invention.
  • the PDP receives a signal of YUV type (luminance + 2 chrominance components) for example extracted from a composite video signal.
  • a motion estimator 10 receives the YUV type signal and provides motion vectors calculated from the received signal and a previously stored image.
  • a format converting circuit 11 converts the YUV type signal into three R, G and B type image signals respectively corresponding to the red, green and blue images to be superimposed to obtain a color image. There are three distinct image signals, but in practice it is also possible to use a parallel or serial bus to carry these three image signals.
  • a first image calculation circuit 12 receives, on the one hand, the blue image signal and, on the other hand, the motion vectors.
  • the first image calculation circuit 12 operates for example as indicated above or according to another image calculation algorithm with motion compensation.
  • the signal B 'supplied by the calculation circuit corresponds to the intermediate image in advance of the time Tr1 with respect to the current image for the blue color.
  • a second image calculation circuit 13 receives, on the one hand, the red image signal and, on the other hand, the motion vectors.
  • the second image calculation circuit 13 is of the same type as the first image calculation circuit 12 but using the duration Tr2 for the intermediate image.
  • the signal R 'supplied by the calculation circuit corresponds to the intermediate image for the red color.
  • An image memory 14 receives the green image signal for storage during the calculation of the intermediate images.
  • the memory 14 and the calculation circuits 12 and 13 can in practice be connected to a bus for receiving the R, G and B signals or to provide the signals R ', V and B'.
  • a sub-scan encoding circuit 15 receives the signal V from the image memory 14, the signals B 'and R' from the image calculation circuits 12 and 13 and a synchronization signal from a Synchronization circuit 16.
  • the encoding circuit 15 provides a series of control bits to a column driver 17 for performing column addressing of the plasma panel 18 (also referred to as the plasma panel panel).
  • a line control circuit 19 allows selection by line or group of lines.
  • the synchronization circuit 16 sends the synchronization signals to the encoding circuits 15, column control 17 and line control 19 to ensure correct addressing of 18.
  • the skilled person can refer to various documents of the state of the art to perform the circuits 15 to 19.
  • the embodiment can support many variants.
  • the figure 5 represents a simplified variant.
  • the operating disparities between the green and red phosphors are not perceptible to the human eye. In this particular case, the correction made on the red does not bring any visible effect. It is then possible to replace the second calculation circuit 13 with an image memory 20. This makes it possible to have a circuit that is less complex and therefore less expensive. However, such a simplification is not possible if the operating disparities between all the phosphors are important.
  • circuitry using a microprocessor and a single memory to perform format conversion, intermediate image calculation and storage of unmodified images.
  • the represented architecture will then be realized by programming.
  • the invention can also be used for a CRT device.
  • the three guns of the CRT receive the signals R, G and B 'through shaping circuits.
  • the intermediate image (s) is (are) between the current image and the previous image. It is also possible to place the intermediate image between the current image and the next image.
  • the current image corresponds to the fastest phosphors and the most advanced intermediate image corresponds to the slowest phosphors.
  • such a variant requires the delay of the image flow to be viewed from an image, which makes it necessary to have larger image memories.

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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)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Luminescent Compositions (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Claims (10)

  1. Verfahren zur Sichtbarmachung einer Sequenz von Videobildern an einer Leuchtstoffvorrichtung mit mindestens zwei Leuchtstofftypen (blau, grün, rot), dadurch gekennzeichnet, dass mindestens ein Zwischenbild zwischen zwei aufeinander folgenden Bildern (Bild I, Bild I-1) berechnet wird, und dass anschließend an mindestens einem Leuchtstofftyp (grün) eines der beiden aufeinander folgenden Bildern (Bild I) und gleichzeitig an mindestens einem anderen Leuchtstofftyp (blau, rot) das Zwischenbild sichtbar gemacht werden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Zwischenbild mit Bewegungskompensation berechnet wird.
  3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass es sich bei den beiden aufeinander folgenden Bildern um ein aktuelles Bild und um ein vorheriges Bild handelt und dass das Zwischenbild einem in Abhängigkeit von den Leuchtstofftypen in Bezug auf das aktuelle Bild um eine bestimmte Dauer (Tr1, Tr2) verzögerten Bild entspricht.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die bestimmte Dauer (Tr1, Tr2) dadurch berechnet wird, dass die Differenz zwischen den Zeitpunkten gebildet wird, die den mittleren Schwerpunkten der Lichtausstrahlung der mindestens zwei Leuchtstofftypen entsprechen.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass drei Leuchtstofftypen verwendet werden und dass an mindestens einem Leuchtstofftyp ein Zwischenbild sichtbar gemacht wird.
  6. Vorrichtung zur Sichtbarmachung einer Videosequenz, mit mindestens zwei Leuchtstofftypen, dadurch gekennzeichnet, dass sie geeignete Mittel (12, 13), um mindestens ein zwischen zwei aufeinander folgenden Bildern angeordnetes Zwischenbild zu berechnen, und geeignete Mittel (14 bis 19), um an einem der Leuchtstofftypen das Zwischenbild und an dem anderen Leuchtstofftyp eines der aufeinander folgenden Bilder sichtbar zu machen, aufweist.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass sie einen Bewegungsschätzer (10) aufweist, der geeignet ist, die Bewegung auf das Zwischenbild zu extrapolieren.
  8. Vorrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass sie drei Leuchtstofftypen aufweist, und dass sie geeignet ist, ein Zwischenbild an mindestens einem Leuchtstofftyp sichtbar zu machen.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Rechenmittel (12 oder 13) geeignet sind, die Berechnung des Zwischenbilds lediglich mit der Farbkomponente durchzuführen, die dem für die Sichtbarmachung des Zwischenbilds verwendeten Leuchtstofftyp entspricht.
  10. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass es sich bei der Vorrichtung um einen Plasmabildschirm handelt.
EP01963101A 2000-08-25 2001-08-16 Bildschirm mit leuchtstoff Expired - Lifetime EP1342226B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0010922A FR2813425B1 (fr) 2000-08-25 2000-08-25 Dispositif de visualisation a luminophores
FR0010922 2000-08-25
PCT/FR2001/002617 WO2002017288A2 (fr) 2000-08-25 2001-08-16 Dispositif de visualisation a luminophores

Publications (2)

Publication Number Publication Date
EP1342226A2 EP1342226A2 (de) 2003-09-10
EP1342226B1 true EP1342226B1 (de) 2008-05-21

Family

ID=8853723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01963101A Expired - Lifetime EP1342226B1 (de) 2000-08-25 2001-08-16 Bildschirm mit leuchtstoff

Country Status (9)

Country Link
US (1) US7064731B2 (de)
EP (1) EP1342226B1 (de)
JP (1) JP4611609B2 (de)
KR (1) KR100767323B1 (de)
CN (1) CN1449555B (de)
AU (1) AU2001284143A1 (de)
DE (1) DE60134171D1 (de)
FR (1) FR2813425B1 (de)
WO (1) WO2002017288A2 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1399912B1 (de) * 2001-06-23 2005-03-30 Thomson Licensing S.A. Anzeigetafel mit farbfehlern in folge unterschiedlicher leuchtstoff- antwortzeiten
EP1361558A1 (de) * 2002-05-07 2003-11-12 Deutsche Thomson Brandt Verminderung von Phosphorantwortzeit von Bildartefakten in einer Anzeige
CN100437679C (zh) * 2003-10-14 2008-11-26 松下电器产业株式会社 图象信号处理方法和图象信号处理装置
KR100714723B1 (ko) * 2005-07-15 2007-05-04 삼성전자주식회사 디스플레이 패널에서의 잔광 보상 방법과 잔광 보상 기기,그리고 상기 잔광 보상 기기를 포함하는 디스플레이 장치
KR100898292B1 (ko) * 2007-11-02 2009-05-18 삼성에스디아이 주식회사 표시 장치 및 그 구동 방법
US9024526B1 (en) 2012-06-11 2015-05-05 Imaging Systems Technology, Inc. Detector element with antenna

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11109916A (ja) * 1997-08-07 1999-04-23 Hitachi Ltd カラー画像表示装置
DE69839542D1 (de) * 1997-08-07 2008-07-10 Hitachi Ltd Farbbildanzeigeeinrichtung und -verfahren
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

Also Published As

Publication number Publication date
CN1449555B (zh) 2012-07-04
WO2002017288A3 (fr) 2002-04-11
KR100767323B1 (ko) 2007-10-17
FR2813425B1 (fr) 2002-11-15
US20040008161A1 (en) 2004-01-15
US7064731B2 (en) 2006-06-20
FR2813425A1 (fr) 2002-03-01
JP4611609B2 (ja) 2011-01-12
EP1342226A2 (de) 2003-09-10
AU2001284143A1 (en) 2002-03-04
DE60134171D1 (de) 2008-07-03
KR20030026344A (ko) 2003-03-31
JP2004506951A (ja) 2004-03-04
CN1449555A (zh) 2003-10-15
WO2002017288A2 (fr) 2002-02-28

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