EP3671706B1 - Regulierungsverfahren der colorimetrischen parameter einer anzeigevorrichtung - Google Patents

Regulierungsverfahren der colorimetrischen parameter einer anzeigevorrichtung Download PDF

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EP3671706B1
EP3671706B1 EP19214880.7A EP19214880A EP3671706B1 EP 3671706 B1 EP3671706 B1 EP 3671706B1 EP 19214880 A EP19214880 A EP 19214880A EP 3671706 B1 EP3671706 B1 EP 3671706B1
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Prior art keywords
triplets
triplet
colorimetric
calibration
display device
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French (fr)
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EP3671706A1 (de
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Siegfried Rouzes
Sébastien Pelletier
Arnaud Petitdemange
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Thales SA
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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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed

Definitions

  • the general technical field of the invention is that of display devices for applications requiring very high colorimetric and photometric performance.
  • the privileged field of the invention is that of aeronautical dashboards.
  • an instrument panel comprises several display screens.
  • the colorimetry and luminance of the images displayed on these screens are subject to very specific requirements so that the crew members always have the same image quality.
  • the continuity of the gradients between the different colors must be perfectly ensured.
  • a colored pixel of a screen conventionally comprises a triple of colored sub-pixels, a first red sub-pixel, a second green sub-pixel and a third blue sub-pixel.
  • Each sub-pixel can take 255 values. Therefore, potentially each pixel can have 255 3 levels of color or luminance, or just over 16 million levels. It is of course impossible to make an individualized correction for each level, which would require a colossal quantity of preliminary measurements and very large capacities for storing the necessary corrections on each on-board display device.
  • each color is defined by a triplet (X, Y, Z) or a triplet (X Y Z).
  • the triplet (u' w , v' w , Y w ) corresponds to the colorimetric coordinates of white.
  • MacAdam ellipse EMA
  • EMA MacAdam ellipse
  • four MacAdam ellipses are represented on the figure 1 . These ellipses are magnified 10 times in this figure.
  • the method according to the invention is based on this property. Color correction doesn't have to be perfect. It is enough that this correction is sufficiently precise to enter the criteria of MacAdam.
  • the method for adjusting the photometric and colorimetric parameters applies to a display device composed of bright colored dots.
  • Each dot is made up of a triple of colored pixels.
  • Each point can take N number of control value triplets.
  • each pixel being able to take 255 different values, this number N is worth 255 3 , that is to say a little more than 16.5 million values.
  • the triplets are referenced in a first color space.
  • this space is the space (R, G, B).
  • To each triplet of control values corresponds a triplet of emission colorimetric values, said triplets of colorimetric values being referenced in a second colorimetric space.
  • This space is the colorimetric space (u', v', L) as previously defined.
  • the method requires a reference display device, a measurement and calibration bench comprising colorimetric and photometric measurement means, means for storing the data collected and means for processing said data to extract the calibration corrections to be applied to certain particular colorimetric points.
  • the display device must also include means for storing the calibration corrections and calculation means making it possible to calculate the correction to be applied to any colorimetric triplicate received as a function of the calibration corrections.
  • the method according to the invention comprises the steps of claim 1 detailed below.
  • the first three steps are implemented on the optical measurement bench. They consist in determining the corrections to be made to a certain number of colorimetric calibration triplets.
  • the following steps are implemented in the display device itself when it is operating. They consist in applying, in real time, from the previous correction data, the corrections to be applied to any colorimetric triple transmitted.
  • the first step consists in measuring, for the reference display device, for a number I of calibration control triplets, triplets of emission colorimetric values called reference triplet, the second plurality being three orders of magnitude less than the first plurality.
  • the number I is 12800.
  • the figure 2 illustrates this step.
  • the point triplets (r i , g i , b i ) calibration commands are referenced in color space (R, G, B).
  • the parameter i varies between 1 and I. these triplets are represented by circles on this figure 2 .
  • the calibration control points are located on a three-dimensional grid, part of which is shown in dotted lines on the figure 2 and are evenly spaced on this grid.
  • critical colors There are certain colorimetric points (r j , g j , b j ) called critical colors whose associated emission must correspond to a perfectly defined colorimetry. In the aeronautical field, these critical colors can correspond, for example, to alarms. By nature, these critical points do not necessarily correspond to the measurement points of the three-dimensional grid.
  • One of these points (r j , g j , b j ) is represented by a double concentric circle on the figure 2 .
  • the second step consists in measuring, for the display device, for the same second plurality of calibration control triplets (r i , g i , b i ), triplets of emission colorimetric values called calibration triplets which are denoted (u i *, v i *, L i *) in the color space (u', v', L).
  • This third step 3 includes the following intermediate steps:
  • ⁇ r I g I b I a I ⁇ v I ⁇ I I ⁇ which associates with each calibration command triplet the corresponding transmission triplet;
  • a sub-family of triplets close to the triplet ( r i , g i , b i ) a sub-family of triplets close to the triplet ( r i , g i , b i ) .
  • this subfamily corresponds to the vertices of the cube including the triple ( r i , g i , b i ).
  • J i The triplets belonging to this family are therefore ⁇ ( r j ,g j ,b j ) ⁇ j ⁇ J I .
  • Each corresponding emission triple is noted a I ⁇ v I ⁇ I I ⁇ and each corresponding reference triplet is denoted a I ⁇ v I ⁇ I I ⁇ TH .
  • a third step of this third step we deduce, for each j ⁇ J i , the difference vector ( dr j , dg j , db j ).
  • a fourth step of this third step we determine the inverse of the derivative of the map noted ⁇ r g b ′ ⁇ 1 for the calibration control triplet considered ( r i , g i , b i ), according to the difference in the values between the calibration triplets and the reference triplets corresponding to the calibration control triplets, this derivative being representative of the correction ( dr i , db i , dg i ) to be made to the calibration command triplet.
  • dr I dg I db I ⁇ r g b ′ ⁇ 1 a I ⁇ v I ⁇ I I ⁇ ⁇ a I ⁇ v I ⁇ I I ⁇ TH
  • This last time of the third stage is illustrated on the picture 3 which represents a calibration triplet ( r i , g i , b i ) with the associated corrections ( dr i , dg i , db i ), the corrected triplet being denoted ( r i , g i , b i ) cor .
  • the second and the third step are also carried out for the critical colors.
  • the fourth step of the method consists, for any control triplet (r, g, b) of the display device called transmitted triplet, in determining a subset of calibration triplets closest to said transmitted triplet in the first colorimetric space.
  • this subset corresponds to the vertices of the cube including the triplet (r, g, b).
  • the triplets belonging to this family are therefore ⁇ ( r k ,g k , b k ) ⁇ k ⁇ J k .
  • the control triplet is close to one or more critical colors, these are also determined.
  • This step is illustrated in the figure 4 which represents a triple of points (r, g, b) with the set of triplets of points to be taken into account for establishing the corrections.
  • eight calibration points numbered from T1 to T8 are taken into account as well as two critical colors C1 and C2.
  • the derived matrix ⁇ r g b ′ r g b which serves as the basis for the calculation of these corrections is obtained by linear interpolation of the values of the matrices ⁇ r k g k b k ′ , extended interpolation to values ( r k , g k , b k ) close to the triple (r, g, b).
  • the corrective value ( dr 2, dg 2, db 2) due to the critical colors is calculated by weighted average of the sum of the influences of the critical colors close enough, the weighting being inversely proportional to the distance to each of these critical colors.
  • the final function ( dr , dg , db ) is calculated by weighted average on the corrections ( dr 1, dg 1, db 1) and ( dr 2, dg 2, db 2) knowing that the weighting remains proportional to the inverse of the distance to the nearest critical color.
  • the triplet (r, g, b) corresponds exactly to a critical color
  • the final corrective value is exactly that of the critical color in question.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Controls And Circuits For Display Device (AREA)

Claims (5)

  1. Verfahren zum Justieren der photometrischen und kolorimetrischen Parameter einer Anzeigevorrichtung bestehend aus leuchtenden Farbpunkten, wobei jeder Punkt aus einem Farbpixeltripel (r, g, b) besteht, wobei jeder Punkt eine erste Vielzahl von Steuerwerttripeln annehmen kann, wobei die Tripel in einem ersten Farbraum (R, G, B) referenziert sind, jedem Steuerwerttripel ein kolorimetrisches Emissionswerttripel (u´, v', L) entspricht, wobei die Farbwerttripel in einem zweiten Farbraum referenziert werden, wobei die Anzeigevorrichtung in Bezug auf eine Referenzanzeigevorrichtung kalibriert ist, dadurch gekennzeichnet, dass das Verfahren die folgenden Schritte umfasst:
    - Schritt 1: Messen, mit kolorimetrischen und photometrischen Messmitteln, für die Referenzanzeigevorrichtung, für eine zweite Vielzahl von Kalibrationssteuertripels (ri, gi, bi), von kolorimetrischen Referenz-Emissionswerttripeln, Referenztripel (ui ∗, vi ∗, Li ∗)TH genannt, wobei die zweite Vielzahl um drei Größenordnungen kleiner als die erste Vielzahl ist, zwischen 10 000 und 15 000,
    - Schritt 2: Messen, mit kolorimetrischen und photometrischen Messmitteln, für die Anzeigevorrichtung, für die gleiche zweite Vielzahl von Kalibrationssteuertripeln, von kolorimetrischen Emissionswerttripeln, Kalibrationstripel (ui ∗, vi ∗, Li ∗) genannt;
    - Schritt 3: Berechnen, durch Berechnungsmittel, für jedes Kalibrationstripel, von auf das entsprechende Kalibrationssteuertripel anzuwendenden Korrekturen (dri; dgi, dbi), so dass das erhaltene kolorimetrische Emissionswerttripel die gleichen Werte wie das entsprechende Referenztripel hat, wobei der Schritt die folgenden Unterschritte umfasst:
    o Schritt 3.1: Bestimmen einer Anwendung (Ψ), die mit jedem Kalibrationssteuertripel das entsprechende Kalibrationstripel assoziiert;
    o Schritt 3.2: Bestimmen, für jedes Kalibrationssteuertripel, einer Gruppe von Ji Kalibrationssteuertripeln {(rj ,gj ,bj )},j ∈ Ji , die dem Kalibrationssteuertripel im ersten Farbraum am nächsten liegen, mit denen Kalibrationstripel {(uj*,vj*,Lj*)},j ∈ Ji und entsprechende Referenztripel {(uj*,vj*,Lj*)TH},j ∈ Ji assoziiert sind;
    o Schritt 3.3: Bestimmen, für jedes Kalibrationssteuertripel, des Derivats (Ψ´) der Anwendung, wobei das Derivat gleich einer Matrix M ist, die die Funktion ∑ j ∈ J i ‖ M dr j dg j db j − u j ∗ v j ∗ L j ∗ − u j ∗ v j ∗ L j ∗ TH ‖ 2
    Figure imgb0015
     mit Abweichungsvektoren (drj ,dgj ,dbj ) = (ri ,gi ,bi ) - (rj ,gj ,bj ) minimiert, die für jedes Kalibrierungssteuertripel bestimmt werden;
    o Schritt 3.4: Bestimmen des Kehrwerts (Ψ´-1) der Ableitung der Anwendung für das betrachtete Kalibrationssteuertripel in Abhängigkeit von der Differenz der Werte zwischen den Kalibrationstripeln und den Referenztripeln, die den Kalibrationssteuertripeln der Gruppe entsprechen, wobei der Kehrwert dieser Ableitung für die Korrektur repräsentativ ist, die an dem Kalibrationssteuertripel vorgenommen werden muss;
    - Schritt 4: Bestimmen, durch Verarbeitungsmittel, für jedes Steuertripel der Anzeigevorrichtung, emittiertes Tripel (r, g, b) genannt, einer Untergruppe von Kalibrationstripeln, die dem emittierten Tripel im ersten Farbraum am nächsten kommen;
    - Schritt 5: Berechnen, durch Berechnungsmittel, der auf das emittierte Tripel anzuwendenden Korrekturen (dr, dg, db) in Abhängigkeit von den Korrekturen, die auf die in Schritt 4 bestimmte Untergruppe der Kalibrationstripels angewendet wurden;
    - Schritt 6: Anwenden, durch Verarbeitungsmittel, der in Schritt 5 berechneten Korrekturen (dr, dg, db) auf die emittierten Tripels.
  2. Verfahren zum Justieren der photometrischen und kolorimetrischen Parameter einer Anzeigevorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Vielzahl von Kalibrationssteuertripeln eine Gruppe von Steuertripeln umfasst, die bestimmten Farben entsprechen, wobei die Gruppe in Schritt 5 bei der Berechnung der auf die Steuertripel der Anzeigevorrichtung angewendeten Korrekturen berücksichtigt wird.
  3. Verfahren zum Justieren der photometrischen und kolorimetrischen Parameter einer Anzeigevorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Korrekturen umgekehrt proportional zu den Abständen sind, die das emittierte Tripel bestimmter Farben unterscheiden, wobei die Abstände im ersten Farbraum gemessen werden.
  4. Verfahren zum Justieren der photometrischen und kolorimetrischen Parameter einer Anzeigevorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der erste Farbraum der (R, G, B)-Raum ist und der zweite Farbraum der CIE 1976-Raum ist.
  5. Verfahren zum Justieren der photometrischen und kolorimetrischen Parameter einer Anzeigevorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die erste Vielzahl gleich 2553 ist.
EP19214880.7A 2018-12-18 2019-12-10 Regulierungsverfahren der colorimetrischen parameter einer anzeigevorrichtung Active EP3671706B1 (de)

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US20140043369A1 (en) * 2012-08-08 2014-02-13 Marc ALBRECHT Displays and Display Pixel Adaptation
JP5922160B2 (ja) * 2014-01-30 2016-05-24 シャープ株式会社 表示較正システム、プログラム、記録媒体
CN105047177A (zh) * 2015-08-19 2015-11-11 京东方科技集团股份有限公司 显示设备调整装置、显示设备调整方法和显示装置
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