EP3671706A1 - Regulierungsverfahren der colorimetrischen parameter einer anzeigevorrichtung - Google Patents

Regulierungsverfahren der colorimetrischen parameter einer anzeigevorrichtung Download PDF

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Publication number
EP3671706A1
EP3671706A1 EP19214880.7A EP19214880A EP3671706A1 EP 3671706 A1 EP3671706 A1 EP 3671706A1 EP 19214880 A EP19214880 A EP 19214880A EP 3671706 A1 EP3671706 A1 EP 3671706A1
Authority
EP
European Patent Office
Prior art keywords
triplet
triplets
calibration
display device
control
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
Application number
EP19214880.7A
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English (en)
French (fr)
Other versions
EP3671706B1 (de
Inventor
Siegfried Rouzes
Sébastien Pelletier
Arnaud Petitdemange
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.)
Thales SA
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Thales SA
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Publication date
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Publication of EP3671706A1 publication Critical patent/EP3671706A1/de
Application granted granted Critical
Publication of EP3671706B1 publication Critical patent/EP3671706B1/de
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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
    • G09G3/006—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 performances.
  • the preferred field of the invention is that of aeronautical dashboards.
  • a dashboard In the aeronautical field, a dashboard has 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. In particular, the continuity of the gradations between the different colors must be perfectly ensured. Furthermore, when a display screen is replaced, it is essential that this replacement be done while maintaining the same color and photometric requirements.
  • a colored pixel of a screen conventionally comprises a triplet 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 amount 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 color coordinates of white.
  • MacAdam ellipse EMA
  • EMA MacAdam ellipse
  • four MacAdam ellipses are represented on the figure 1 . These ellipses are enlarged 10 times in this figure.
  • the method according to the invention is based on this property.
  • the color correction does not have to be perfect. It is enough that this correction is sufficiently precise to enter the criteria of MacAdam.
  • the second plurality of calibration control triplets comprises a group of control triplets corresponding to specific colors, said group being taken into account, in step 5, in the calculation of the corrections applied to the control triplets of the measurement device. visualization.
  • the corrections are inversely proportional to the distances separating the triplet emitted from the specific colors, the distances being measured in the first color space.
  • the first color space is the space (R, G, B) and that the second color space is the CIE 1976 space.
  • the first plurality is equal to 255 3 and that the second plurality is between 10,000 and 15,000.
  • the method for adjusting the photometric and colorimetric parameters applies to a display device composed of bright colored dots.
  • Each point consists of a triplet of colored pixels.
  • Each point can take a number N of triplets of command values.
  • this number N is equal to 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 space (R, G, B).
  • Each triplet of control values corresponds to a triplet of emission color values, said triplets of color values being referenced in a second color space. This space is the color space (u ', v', L) as defined above.
  • the method requires a reference display device, a measurement and calibration bench comprising colorimetric and photometric measurement means, means for memorizing the collected data and means for processing said data in order to extract the calibration corrections to be applied to it. some specific color points.
  • the display device must also include means for storing the calibration corrections and calculation means for calculating the correction to be applied to any color triplet received as a function of the calibration corrections.
  • the method according to the invention comprises several steps detailed below.
  • the first three steps are implemented on the optical bench. They consist in determining the corrections to be made to a certain number of colorimetric triplets for calibration.
  • 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 color triplet emitted.
  • 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 triplets, the second plurality being three orders of magnitude less than the first plurality.
  • the number I is equal to 12800.
  • the figure 2 illustrates this step.
  • the triplets of points (r i , g i , b i ) of calibration commands are referenced in the 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 represented by dotted lines on the figure 2 and are regularly spaced on this grid.
  • Each triplet of calibration control points (r i , g i , b i ) therefore associates a triplet of emission colorimetric values called reference triplet whose coordinates in the color space (u ', v', L) are (u i *, v i *, L i *) TH .
  • 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 known as calibration triplets which are noted (u i *, v i *, L i *) in the color space (u ', v', L).
  • This third step 3 comprises the following intermediate steps:
  • a triplet subfamily close to the triplet ( r i , g i , b i ) .
  • this subfamily corresponds to the vertices of the cube including the triplet ( 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 u j * v j * L j * and each corresponding reference treble is noted u j * v j * L j * TH .
  • a third step of this third step we deduce, for each j ⁇ J i , the deviation vector ( dr j , dg j , db j ).
  • This derivative is equal to the matrix M which minimizes the following form: ⁇ j ⁇ J i ⁇ M dr j dg j db j - u j * v j * L j * - u j * v j * L j * TH ⁇ 2
  • a fourth step of this third step the inverse of the derivative of the application noted is determined.
  • This last stage of the third stage is illustrated on the figure 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 noted ( r i , g i , b i ) cor .
  • the second and third steps are also carried out for critical colors.
  • the fourth step of the method consists, for any control triplet (r, g, b) of the display device said triplet emitted, to determine a subset of calibration triplets closest to said triplet emitted in the first color 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 . When the command triplet is close to one or more critical colors, these are also determined.
  • This step is illustrated on the figure 4 which represents a triplet of points (r, g, b) with all the triplets of points to be taken into account for the establishment of 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 is used as a 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 triplet (r, g, b).
  • the corrective value (dr2, dg 2, db 2) due to the critical colors is calculated by weighted average of the sum of the influences of the critical colors sufficiently close, 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 over 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)
EP19214880.7A 2018-12-18 2019-12-10 Regulierungsverfahren der colorimetrischen parameter einer anzeigevorrichtung Active EP3671706B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1872959A FR3090176B1 (fr) 2018-12-18 2018-12-18 Procédé d’ajustement des paramètres colorimétriques d’un dispositif de visualisation

Publications (2)

Publication Number Publication Date
EP3671706A1 true EP3671706A1 (de) 2020-06-24
EP3671706B1 EP3671706B1 (de) 2022-03-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19214880.7A Active EP3671706B1 (de) 2018-12-18 2019-12-10 Regulierungsverfahren der colorimetrischen parameter einer anzeigevorrichtung

Country Status (2)

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EP (1) EP3671706B1 (de)
FR (1) FR3090176B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140043369A1 (en) * 2012-08-08 2014-02-13 Marc ALBRECHT Displays and Display Pixel Adaptation
US20150213771A1 (en) * 2014-01-30 2015-07-30 Sharp Kabushiki Kaisha Display calibration system and storage medium
US20170221403A1 (en) * 2015-08-19 2017-08-03 Boe Technology Group Co., Ltd. Apparatus and method for adjusting display parameters and display apparatus
US20180114475A1 (en) * 2016-10-24 2018-04-26 Samsung Electronics Co., Ltd. Display apparatus and calibration method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140043369A1 (en) * 2012-08-08 2014-02-13 Marc ALBRECHT Displays and Display Pixel Adaptation
US20150213771A1 (en) * 2014-01-30 2015-07-30 Sharp Kabushiki Kaisha Display calibration system and storage medium
US20170221403A1 (en) * 2015-08-19 2017-08-03 Boe Technology Group Co., Ltd. Apparatus and method for adjusting display parameters and display apparatus
US20180114475A1 (en) * 2016-10-24 2018-04-26 Samsung Electronics Co., Ltd. Display apparatus and calibration method thereof

Also Published As

Publication number Publication date
FR3090176B1 (fr) 2021-07-30
FR3090176A1 (fr) 2020-06-19
EP3671706B1 (de) 2022-03-09

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