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WO2017190797A1 - Système et procédé destinés à la correction de la luminescence blanche dans les systèmes d'affichage de mur vidéo - Google Patents

Système et procédé destinés à la correction de la luminescence blanche dans les systèmes d'affichage de mur vidéo Download PDF

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Publication number
WO2017190797A1
WO2017190797A1 PCT/EP2016/060185 EP2016060185W WO2017190797A1 WO 2017190797 A1 WO2017190797 A1 WO 2017190797A1 EP 2016060185 W EP2016060185 W EP 2016060185W WO 2017190797 A1 WO2017190797 A1 WO 2017190797A1
Authority
WO
WIPO (PCT)
Prior art keywords
image display
video wall
control station
wall system
values
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.)
Ceased
Application number
PCT/EP2016/060185
Other languages
English (en)
Inventor
Birkan DEMIRCAN
Metin DUMAN
Turgay KALE
Bilgin OZDEMIR
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Priority to PCT/EP2016/060185 priority Critical patent/WO2017190797A1/fr
Priority to TR2017/06571A priority patent/TR201706571A2/tr
Publication of WO2017190797A1 publication Critical patent/WO2017190797A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/02—Composition of display devices
    • G09G2300/026—Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across 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
    • G09G2320/02—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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/08—Arrangements within a display terminal for setting, manually or automatically, display parameters of the display terminal
    • 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
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller

Definitions

  • the present invention relates to calibration of display devices, more specifically to a system and method for achieving general white luminescence balance in video wall display systems.
  • Image display devices present images on screens thereof and combination of multi-display devices in order to form a large screen display environment called a video wall is one of the functions achievable through combination and simultaneous operation of a plurality of individual image display devices.
  • the term video wall generally refers to the generation of a combined image from a single video input by means of a plurality of image display devices as a single video wall image.
  • the video wall may typically be arranged in the form of 1x4, 2x2, 3x3, 4x4 or much larger screen formats.
  • Video walls are basically preferred due to their capability to generate a very large screen whose tile layout can be customized by which a greater screen area and greater pixel density per unit cost can be achieved, which is advantageous due to manufacturing costs of single screens, hence allowing an unusual resolution when combined.
  • Video walls are conventionally used in large public venues such as stadiums. Video walls can be driven from multi-monitor video cards, but complex arrangements require special video processors capable to manage large video walls. Software based video wall controllers however use PCs and networking equipment.
  • a major problem that needs to be addressed in the field of video wall display systems is color matching. Even if all component screens utilize the same technology, due to material variations, assembly tolerances, component aging and environmental effects such as humidity and temperature; each screen can produce a different color balance, color temperature and white luminescence from the same input signal.
  • WO 2009086468 discloses a sensor for color calibration of one or more display devices using feedback obtained directly from said display devices.
  • the sensor reads and quantifies the output of a display device and transmits the results to the image processor.
  • the image processor compares the display characteristics and then modifies the 3D LUT (lookup table) of the display system according to the feedback signal to perform a “correction” that compensates for the differences between the display systems.
  • US 7618146 discloses a luminance correction circuit for a plurality of display devices.
  • the luminance correction circuit comprises a timing circuit for generating display position information, a coefficient arrangement control unit for implementing a non-linear arrangement of gain coefficients for gradation control that is carried out in picture element units and a gradation conversion LUT unit for adjusting display positions based on the display position information from the timing circuit and then implementing a luminance level conversion of input signal levels of the picture signals.
  • the present invention provides a system and method for realizing uniform white luminescence distribution in a plurality of display devices utilized as a video wall in order to obtain uniform and seamless image quality.
  • the present invention therefore provides a system and method to achieve overall white luminescence balance in video wall display systems as provided by the characterizing features defined in Claim 1.
  • Primary object of the present invention is hence to provide a system and method for achieving overall white luminescence balance in video wall display systems.
  • Fig. 1 demonstrates general working steps in the form of a routing diagram structure according to the present invention.
  • the present invention proposes a video wall system with a multitude of image display devices, each device comprising at least one input connector.
  • the video wall system’s operation is effectuated such that each image display device is individually set to identify its particular enlarged screen portion of the overall screen as delineated below.
  • the video wall system of the invention is created by means of a plurality of image display devices, the latter together forming a combined very large screen in the form of a generally rectangular web.
  • Each of the combined image display devices then generates and displays a certain dedicated portion of the video content so that the video content can be displayed on a combined large screen.
  • Each of said image display devices comprises a control unit for identification and generation of the dedicated portion of the complete image or video content.
  • Each image display device therefore processes the received image or video content to create a certain portion of the overall screen area together with a plurality of neighboring or adjacent image display devices.
  • the video wall system may therefore operate according to a method of serial transmission of the image or video content to obtain an overall image in a much larger size that a single display device cannot display, by way of dividing the main image into a plurality of image portions for display on separate image display devices.
  • a control station of the video wall system can typically be a computer system with video stream processing capabilities.
  • the control station may transfer the source images to a first image display device to be transmitted from said first image display device to one of the immediately neighboring display devices through the input and output connectors on the video transmission line.
  • two neighboring image display devices can be placed vertically, horizontally or otherwise with respect to one another so that a generally rectangular shape large screen is obtainable.
  • Each image display device within the video wall system is configured to display a certain dedicated portion of the image or video content and accordingly divides the image or video content so as to generate a specially adapted portion thereof corresponding to the specific screen area of the overall combined screen size depending on the number of image display devices on the vertical and horizontal axes.
  • the invention proposes a method and system by which said control station individually communicates with each and every image display device in the video wall web to collect gamma, RGB and white luminescence values.
  • said control station establishes a plurality of concurrent remote network connections with individual image display devices having respective MAC addresses so that a look-up table of current parametric values can be retrieved for each image display device.
  • said control station simultaneously reconfigures current parametric values in said look-up table to eliminate any noticeable discrepancies along contact lines of neighboring screens whereby uniformity of visual parameters in a plurality of display devices is ensured.
  • the video wall performs in a uniform manner with regard to the image display parameters and a seamless image quality can be achieved conveniently and in a substantially practical manner without any additional input from the user.
  • configuration of a plurality of units making up the overall system would otherwise necessitate not only individual configuration of the units but also calculation of the optimal parameter values in view of the different values for each parameter in different image display devices. Therefore, the invention advantageously undertakes calculation of the optimal parametric values to be applied to each unit in the overall system in a substantially reduced amount of time.
  • a dynamically updated or adjustable set of values should be understood as the outer environment where the video wall system is installed may necessitate different sets of gamma, RGB and white luminescence values, which is advantageous in that the general visual performance of the video wall web units will be simultaneously and effectively optimized.
  • control station can be connected to the displays via wired or wireless connections.
  • gamma, RGB and white luminescence values are read from the respective memories of the image display devices and for every PWM level, color gamut and color temperature values and white and RGB color coordinates are calculated.
  • gamma curves, color graphics and RGB W parameters are calculated and the mean and standard deviation of these values among the display devices are determined. According to these values, the gamma values of the displays are reconfigured so that each display has a similar corrected gamma value.
  • white luminescence levels are read from the display memory and reconfigured according to calculated mean and standard deviation values so that each display has a similar corrected white luminescence value.
  • the present invention proposes a video wall system having a multitude of image display devices, each image display device receiving video transmission to generate and display a certain dedicated portion of a video content by which the video content is displayable in the form of a combined screen, said video wall system further comprising a control station controlling the operation thereof in data communication with each image display device of the video wall system.
  • said control station communicates with each image display device of the video wall system so as to retrieve visual setting parameters of each image display device.
  • said control station forms a look-up table of current parametric values retrieved in respect of each image display device.
  • said control station determines image display devices with predetermined levels of deviations from predetermined parametric values.
  • said control station transfers and simultaneously reconfigures parametric values of the image display devices with predetermined levels of deviations in view of the predetermined parametric values and additionally depending on environmental illuminance conditions.
  • said control station establishes remote network connections with individual image display devices having respective MAC addresses.
  • said visual setting parameters relate to gamma, RGB and white luminescence values.
  • said control station retrieves gamma, RGB and white luminescence values from the respective memories of each image display device and color gamut, color temperature values and white and RGB color coordinates are calculated.
  • said control station calculates gamma curves, color graphics and RGB W parameters for each image display device and the mean and standard deviation of said values among all display devices are determined.
  • said control station reconfigures the gamma values of the image displays with a predetermined standard deviation so that each image display device has a similar corrected gamma value.
  • said control station reconfigures white luminescence levels of the image displays with a predetermined standard deviation so that each image display device has a similar corrected white luminescence value.
  • said gamma values or said white luminescence levels are corrected according to environmental illuminance conditions retrieved from an internal or remote network database in the form of time and location based environmental illuminance.
  • said gamma values or said white luminescence levels are corrected according to environmental illuminance conditions measured by an illumination photometer in communication with said control station.
  • the invention provides automatic correction of gamma and white luminescence of the image display devices having a predetermined level of deviation from predetermined parametric values in the form of gamma, RGB and white luminescence values in a video wall system. Additionally, gamma and white luminescence correction is carried out with respect to environmental illuminance conditions measured by an illumination photometer in communication with said control station or retrieved from a database as time and location based values. Applying gamma adjustments will have the effect of lightening or darkening certain tones while keeping the black point and the white point the same. Therefore, the gamma correction is applied depending on the environmental illuminance conditions, i.e. depending on the specific time of the day and amount of light being available.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Color Television Image Signal Generators (AREA)

Abstract

La présente invention concerne l'étalonnage de dispositifs d'affichage au moyen d'un système réalisant un équilibrage de la luminescence blanche dans des systèmes d'affichage de mur vidéo. La présente invention concerne plus particulièrement un système de mur vidéo ayant une multitude de dispositifs d'affichage d'image, chaque dispositif d'affichage d'image recevant une transmission vidéo afin de générer et d'afficher une certaine partie dédiée d'un contenu vidéo au moyen duquel le contenu vidéo peut être affiché sous la forme d'un écran combiné, ledit système de mur vidéo comprenant en outre une station de commande commandant le fonctionnement associé dans la communication de données avec chaque dispositif d'affichage d'image du système de mur vidéo.
PCT/EP2016/060185 2016-05-06 2016-05-06 Système et procédé destinés à la correction de la luminescence blanche dans les systèmes d'affichage de mur vidéo Ceased WO2017190797A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2016/060185 WO2017190797A1 (fr) 2016-05-06 2016-05-06 Système et procédé destinés à la correction de la luminescence blanche dans les systèmes d'affichage de mur vidéo
TR2017/06571A TR201706571A2 (tr) 2016-05-06 2017-05-04 Vi̇deo duvari görüntüleme si̇stemleri̇nde beyaz parlakliğinin düzelti̇lmesi̇ni̇ sağlayan si̇stem ve yöntem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/060185 WO2017190797A1 (fr) 2016-05-06 2016-05-06 Système et procédé destinés à la correction de la luminescence blanche dans les systèmes d'affichage de mur vidéo

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WO2017190797A1 true WO2017190797A1 (fr) 2017-11-09

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TR (1) TR201706571A2 (fr)
WO (1) WO2017190797A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190244561A1 (en) * 2016-11-17 2019-08-08 Xi'an Novastar Tech Co., Ltd. Pixel-by-pixel calibration method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1701331A1 (fr) * 2005-03-07 2006-09-13 Research In Motion Limited Système et méthode pour régler le rétro-éclairage d'un afficheur sur un appareil électronique
WO2009086468A1 (fr) 2008-01-02 2009-07-09 Panavision International, L.P. Correction de différences de couleurs dans des afficheurs à écrans multiples
US7618146B2 (en) 2004-07-16 2009-11-17 Nec Viewtechnology, Ltd. Multiscreen display system, multiscreen display method, luminance correction method, and programs
US20110242142A1 (en) * 2010-03-30 2011-10-06 Ati Technologies Ulc Multiple display chrominance and luminance method and apparatus
US20140198020A1 (en) * 2013-01-16 2014-07-17 Shenzhen China Star Optoelectronics Technology Co., Ltd. Spliced liquid crystal display (slcd), method for checking the slcd, and lcd device
US20150348468A1 (en) * 2014-06-02 2015-12-03 Apple Inc. Displays with Adaptive Spectral Characteristics
US20160019831A1 (en) * 2014-07-16 2016-01-21 Ultravision Technologies, Llc Display System having Module Display Panel with Circuitry for Bidirectional Communication
WO2016033099A1 (fr) * 2014-08-26 2016-03-03 Qualcomm Incorporated Ajustement d'affichage adapté à l'environnement
EP3010009A1 (fr) * 2013-06-14 2016-04-20 EIZO Corporation Système à multiples dispositifs de surveillance, programme d'ordinateur et dispositif d'affichage utilisés dans ledit système

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7618146B2 (en) 2004-07-16 2009-11-17 Nec Viewtechnology, Ltd. Multiscreen display system, multiscreen display method, luminance correction method, and programs
EP1701331A1 (fr) * 2005-03-07 2006-09-13 Research In Motion Limited Système et méthode pour régler le rétro-éclairage d'un afficheur sur un appareil électronique
WO2009086468A1 (fr) 2008-01-02 2009-07-09 Panavision International, L.P. Correction de différences de couleurs dans des afficheurs à écrans multiples
US20110242142A1 (en) * 2010-03-30 2011-10-06 Ati Technologies Ulc Multiple display chrominance and luminance method and apparatus
US20140198020A1 (en) * 2013-01-16 2014-07-17 Shenzhen China Star Optoelectronics Technology Co., Ltd. Spliced liquid crystal display (slcd), method for checking the slcd, and lcd device
EP3010009A1 (fr) * 2013-06-14 2016-04-20 EIZO Corporation Système à multiples dispositifs de surveillance, programme d'ordinateur et dispositif d'affichage utilisés dans ledit système
US20150348468A1 (en) * 2014-06-02 2015-12-03 Apple Inc. Displays with Adaptive Spectral Characteristics
US20160019831A1 (en) * 2014-07-16 2016-01-21 Ultravision Technologies, Llc Display System having Module Display Panel with Circuitry for Bidirectional Communication
WO2016033099A1 (fr) * 2014-08-26 2016-03-03 Qualcomm Incorporated Ajustement d'affichage adapté à l'environnement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190244561A1 (en) * 2016-11-17 2019-08-08 Xi'an Novastar Tech Co., Ltd. Pixel-by-pixel calibration method
US10726776B2 (en) * 2016-11-17 2020-07-28 Xi'an Novastar Tech Co., Ltd. Pixel-by-pixel calibration method

Also Published As

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