EP1342226A2 - Dispositif de visualisation a luminophores - Google Patents
Dispositif de visualisation a luminophoresInfo
- Publication number
- EP1342226A2 EP1342226A2 EP01963101A EP01963101A EP1342226A2 EP 1342226 A2 EP1342226 A2 EP 1342226A2 EP 01963101 A EP01963101 A EP 01963101A EP 01963101 A EP01963101 A EP 01963101A EP 1342226 A2 EP1342226 A2 EP 1342226A2
- 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.)
- Granted
Links
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
- Luminophore display device
- the invention relates to a display device using luminescent materials to display the points of an image.
- the invention applies more particularly to plasma display panels as well as to cathode ray tubes using high scanning frequencies.
- Plasma display panels (PDP) as well as cathode ray tubes (CRT) have on their front side a layer of luminescent material which transforms either UV radiation or electronic radiation into visible light radiation.
- the luminescent material is commonly called a phosphor.
- luminophores of different colors present some operating disparities due to the intrinsic characteristics of the materials constituting the phosphors.
- the temporal response to an excitation is specific to each type of phosphor.
- FIG. 1 represents timing diagrams of phosphor reaction commonly used in PDPs.
- FIG. 1A represents an excitation duration during which electrical discharges are sent into the panel in order to produce UV radiation, not shown. The UV radiation is then transformed into visible light by the phosphors.
- FIG. 1B represents the light rendering for a blue phosphor, for example a barium and magnesium aluminate doped with divalent Europium.
- Figure 1C shows the light rendering for a colored phosphor red, for example a Yttrium Borate doped with trivalent Europium.
- FIG. 1D represents the light rendering for a green phosphor, for example a barium aluminate doped with Manganese.
- Figures 1B to 1D have different vertical scales which correspond to the maximum values of each of the curves.
- the maximum value of blue color is approximately 4.3 times greater than the maximum value of red color and approximately 5.5 times greater than the maximum value of green color.
- the light energy yield is substantially the same for each of the colors.
- FIG. 1E represents on the one hand the luminous renditions of the three colors with the same light intensity scale and on the other hand the sum of the three luminous renditions which corresponds to a pixel seen by the human eye. If we are interested in the color corresponding to the sum of the three renderings, we see that the pixel is first blue, then goes from blue to white (or gray depending on the intensity), then goes from white to yellow (combination of green and red of substantially the same intensity), and finally goes from yellow to green before going out. In PDPs, the discharges are repeated cyclically at the screen refresh rate.
- the retinal persistence of the human eye performs a low-pass type filtering on color variations which masks this defect.
- the invention is a method of viewing 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 displayed on at least one type of phosphor and simultaneously on at least one other type of phosphor 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 an image which lags behind the current image by a duration defined as a function of the types of phosphor.
- the defined duration is calculated by making the difference between the instants corresponding to the average centers of gravity of light emission 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.
- FIG. 1 represents timing diagrams of response of the phosphors
- FIGS. 2 and 3 illustrates the principle of the intermediate image calculated according to the invention
- FIG. 4 illustrates a preferred embodiment of a phosphor display device according to the invention
- FIG. 5 illustrates a variant of the preferred embodiment of the invention.
- the information to be displayed is shifted.
- the phosphors of the blue type have a remanence time much lower than the phosphors of the red or green type
- the phosphors of the red type have a remanence time less than the phosphors of the green type.
- Image I a current image
- the calculation of the intermediate image can be done using different techniques. Those skilled in the art can refer to the publications relating to the image calculations used to change the image frequency 50 / 60Hz or 50 / 100Hz. Preferably, it is desired that the intermediate image is as close as possible to the image which should be displayed at this instant, in particular as regards moving objects. To calculate the best possible image, the intermediate image should be calculated with motion compensation. The compensation in movement is done according to a known technique. Motion vectors 1 are calculated from images I and 1-1 so that each pixel (composed of the three colors) corresponds to a vector 1, as shown in FIG. 3.
- the extrapolated vector 2 is for example the average vector corresponding to the closest vectors 1.
- the extrapolated vector 2 points between several pixels of the image I, then the corresponding pixel of the intermediate image corresponds to the average of the closest pixels.
- the time Tri separating the image I and the intermediate image should be large enough to provide a correction but not too large so as not to reverse the display defect. It seems quite difficult to precisely determine the ideal Tri time.
- a simple calculation method giving an effective result consists in calculating the instant corresponding to the average center of gravity of light emission for each type of phosphor in its environment of use.
- FIG. 4 represents an exemplary embodiment of a plasma display panel implementing the invention.
- the PDP receives a YUV type signal (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 from a previously stored image.
- a format conversion circuit 11 transforms the YUV type signal into three R, G and B type image signals corresponding respectively to the red, green and blue images to be superimposed to obtain a color image. Three separate image signals are shown, but in practice it is also possible to use a parallel or serial bus to route 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 previously 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 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 color red.
- An image memory 14 receives the green image signal to store it 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 to receive the signals R, G and B or to supply the signals R ', G and B'.
- a subscanning 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 supplies series of control bits to a column control circuit 17 for effecting column addressing of the plasma screen 18 (also called a panel of the plasma panel).
- a line control circuit 19 allows selection by line or by 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 screen 18.
- a person skilled in the art can refer to various documents of the state of the art for producing circuits 15 to 19.
- FIG. 5 represents a simplified variant.
- the disparities in operation between the green and red phosphors are not perceptible to the human eye.
- the correction made on the red has no 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 less complex and therefore less expensive circuit.
- such a simplification cannot be envisaged if the operating disparities between all the phosphors are significant.
- circuit assembly using a microprocessor and a single memory to perform the format conversion, the intermediate image calculation and the storage of the unmodified images.
- the architecture represented will then be produced by programming.
- the invention can also be used for a CRT device.
- the three CRT guns receive the signals R, G and B 'via shaping circuits.
- the intermediate image (s) is located 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 delaying the image flow to be displayed by an image, which requires having larger image memories.
Landscapes
- 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)
Abstract
Description
Claims
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 true EP1342226A2 (fr) | 2003-09-10 |
EP1342226B1 EP1342226B1 (fr) | 2008-05-21 |
Family
ID=8853723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01963101A Expired - Lifetime EP1342226B1 (fr) | 2000-08-25 | 2001-08-16 | Dispositif de visualisation a luminophores |
Country Status (9)
Country | Link |
---|---|
US (1) | US7064731B2 (fr) |
EP (1) | EP1342226B1 (fr) |
JP (1) | JP4611609B2 (fr) |
KR (1) | KR100767323B1 (fr) |
CN (1) | CN1449555B (fr) |
AU (1) | AU2001284143A1 (fr) |
DE (1) | DE60134171D1 (fr) |
FR (1) | FR2813425B1 (fr) |
WO (1) | WO2002017288A2 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100845684B1 (ko) * | 2001-06-23 | 2008-07-11 | 톰슨 라이센싱 | 인광체의 반응 시간차에 기인한 디스플레이 패널에서의 컬러 결함을 해결하기 위한 영상 처리 방법 및 처리 장치 |
EP1361558A1 (fr) * | 2002-05-07 | 2003-11-12 | Deutsche Thomson Brandt | Réduction des artefacts des images le temps de réponse des phosphores d'un dispositif d'affichage |
US7602357B2 (en) * | 2003-10-14 | 2009-10-13 | Panasonic Corporation | Method and apparatus of image signal processing |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69839542D1 (de) * | 1997-08-07 | 2008-07-10 | Hitachi Ltd | Farbbildanzeigeeinrichtung und -verfahren |
JPH11109916A (ja) * | 1997-08-07 | 1999-04-23 | Hitachi Ltd | カラー画像表示装置 |
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 |
-
2000
- 2000-08-25 FR FR0010922A patent/FR2813425B1/fr not_active Expired - Fee Related
-
2001
- 2001-08-16 AU AU2001284143A patent/AU2001284143A1/en not_active Abandoned
- 2001-08-16 EP EP01963101A patent/EP1342226B1/fr not_active Expired - Lifetime
- 2001-08-16 JP JP2002521271A patent/JP4611609B2/ja not_active Expired - Fee Related
- 2001-08-16 DE DE60134171T patent/DE60134171D1/de not_active Expired - Lifetime
- 2001-08-16 WO PCT/FR2001/002617 patent/WO2002017288A2/fr active IP Right Grant
- 2001-08-16 CN CN018146406A patent/CN1449555B/zh not_active Expired - Fee Related
- 2001-08-16 US US10/362,482 patent/US7064731B2/en not_active Expired - Fee Related
- 2001-08-16 KR KR1020037002360A patent/KR100767323B1/ko not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0217288A2 * |
Also Published As
Publication number | Publication date |
---|---|
US7064731B2 (en) | 2006-06-20 |
DE60134171D1 (de) | 2008-07-03 |
AU2001284143A1 (en) | 2002-03-04 |
WO2002017288A2 (fr) | 2002-02-28 |
FR2813425A1 (fr) | 2002-03-01 |
JP2004506951A (ja) | 2004-03-04 |
US20040008161A1 (en) | 2004-01-15 |
CN1449555B (zh) | 2012-07-04 |
KR20030026344A (ko) | 2003-03-31 |
CN1449555A (zh) | 2003-10-15 |
JP4611609B2 (ja) | 2011-01-12 |
EP1342226B1 (fr) | 2008-05-21 |
KR100767323B1 (ko) | 2007-10-17 |
FR2813425B1 (fr) | 2002-11-15 |
WO2002017288A3 (fr) | 2002-04-11 |
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