EP2905771A1 - Verfahren und Vorrichtung zur Überprüfung der Bildanzeige auf einem elektronischen Bildschirm - Google Patents

Verfahren und Vorrichtung zur Überprüfung der Bildanzeige auf einem elektronischen Bildschirm Download PDF

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Publication number
EP2905771A1
EP2905771A1 EP15154364.2A EP15154364A EP2905771A1 EP 2905771 A1 EP2905771 A1 EP 2905771A1 EP 15154364 A EP15154364 A EP 15154364A EP 2905771 A1 EP2905771 A1 EP 2905771A1
Authority
EP
European Patent Office
Prior art keywords
image
electronic screen
screen
display
led
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.)
Withdrawn
Application number
EP15154364.2A
Other languages
English (en)
French (fr)
Inventor
Arnaud Simon
Hang Ung
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.)
JCDecaux SE
Original Assignee
JCDecaux SE
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 JCDecaux SE filed Critical JCDecaux SE
Publication of EP2905771A1 publication Critical patent/EP2905771A1/de
Withdrawn legal-status Critical Current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
    • 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
    • G09G3/30—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 electroluminescent panels
    • G09G3/32—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference 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
    • 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to methods and devices for verifying image display on light emitting diode electronic displays (hereinafter LED displays).
  • Document is known US 2011/0096246 A1 a method for verifying a display on an electronic screen, wherein an optical sensor is used to capture at least a portion of the display of an electronic display to verify that the electronic display has displayed the desired images.
  • Such a method can be implemented for example to guarantee an advertiser that a given advertising display (still images or video) has been displayed at the desired times or for the desired duration.
  • the present invention is intended to overcome this disadvantage.
  • the Figure 1 illustrates a device 10 for verifying an image display on an LED screen according to the invention.
  • the device 10 comprises an LED screen 12, a central unit 14 (CPU) adapted to control the LED screen 12 and display at least one image on the LED screen, preferably several images, and a sensor 16 (CAPT) adapted to measure a display parameter when displaying images.
  • CPU central unit
  • CAPT sensor
  • the display parameter used is an electrical consumption of at least a portion of the LED screen 12, preferably of the entire LED screen 12.
  • the LED screen 12 comprises a matrix of M * N pixels, each pixel comprising a red LED, a green LED and a blue LED.
  • the LEDs are mounted on electronic boards 18 arranged next to each other on a common frame.
  • the present invention is equally applicable to LED screens using DIP ("Dual In Place") technology in which an LED corresponds to a color (red, green or blue) and in which the LEDs are mounted in depth on the electronic boards.
  • LED displays using Surface Mount Device (SMD) technology in which one LED corresponds to three colors (red, green and blue) and in which the LEDs are surface-mounted on the electronic boards.
  • SMD Surface Mount Device
  • the LEDs are controlled individually by control boards 20 (DRIVER) which each control a group of LEDs, for example 8 LEDs.
  • Each control card 20 can control all or part of the LEDs of an electronic card 18.
  • control cards 20 control the LEDs by multiplexing, each channel of each control card 20 controlling several LEDs by operating them alternately.
  • the control boards 20 are controlled by the central unit 14, such as a microprocessor or microcontroller or the like.
  • the control boards 20 deliver to each LED that they control a precisely determined electric current according to the commands received from the central unit 14.
  • the device 10 further comprises a power supply module 22 (ALIM) which supplies the LED screen 12 and the central unit 14.
  • ALIM power supply module 22
  • the sensor 16 is connected to the power supply module 22 and makes it possible to measure the instantaneous actual power consumption of at least a portion of the LED screen 12, preferably of the entire LED screen 12.
  • the senor 16 has a sampling frequency of 60 Hz. Such a sensor would thus make it possible to obtain reliable measurements and to adapt as well to the European system where the PAL standard imposes 25 images per second for television sets, as to the American and Japanese systems where the NTSC standard imposes 30 images per second .
  • the sensor 16 is for example a wattmeter or an ammeter.
  • the Figure 2 illustrates the various steps of a method according to the invention to verify an image display on an LED screen, for example the LED screen 12 of the Figure 1 .
  • the LED screen 12 is of SMD type and comprises 128 * 96 pixels, each pixel being coded on 8 bits which corresponds to 256 RGB color levels ranging from 0 to 255.
  • the determined power consumption is that of the entire LED screen.
  • the 128 * 96 red LEDs are lit with a brightness of 100% and an RGB color level of 255, while all Green and blue LEDs, respectively red and blue, and red and green, are off.
  • the power consumption of the LED screen determined in sub-step a4) is called “static consumption”. It corresponds to the power consumption of all the components of the LED screen 12 other than the LEDs, for example the central unit 14, the control boards 20, fans, etc.
  • Sub-steps a1) to a4) are preferably performed by power consumption measurements, that is to say by manually measuring in situ the different electrical consumptions using the sensor 16.
  • sub-steps a1) to a4) may be provided by the manufacturer of the LED screen 12.
  • Each given image corresponds to a predetermined color composition.
  • Known image processing software such as Photoshop® can give the exact composition of an image in terms of RGB color level.
  • the principle of the invention is to associate an image with an electrical consumption signature that can be calculated from the colors that make up this image, and in particular from the determinations made in substeps a1) to a4).
  • the method comprises a preliminary step b) of calculating electric consumption reference values corresponding to reference images.
  • This step can be implemented by the central unit 14.
  • the gamma of a screen characterizes the contrast rendering of the screen and makes it possible to describe the relationship between the amplitude of the input signal of the screen and the luminance produced by the screen, this relationship being according to a law of power.
  • the gamma of a screen is a given manufacturer and is generally equal to 2.2 for an electronic screen.
  • the Figure 3 represents the LED screen 12 displaying an image comprising four regions 30, 32, 34 and 36 with a brightness of 100%.
  • the method further comprises a step c) of displaying at least one image, preferably several images, on the LED screen 12.
  • This step can be implemented by the central unit 14.
  • the method further comprises a step d) of measuring at least one value, preferably several values, of the instantaneous actual power consumption of the LED screen 12 when the images are displayed.
  • This step is implemented using the sensor 16, by directly measuring the instantaneous electrical power consumed by the LED screen 12 or the instantaneous electric current.
  • the data obtained can be stored by the central unit 14 or they can be sent by the central unit 14 to a memory of a remote server for later processing. In addition to the measured electrical consumption values, the data obtained can be also understand the date and time of the measurements.
  • the method further comprises a step e) of comparing the measured values of electrical consumption with electric consumption reference values calculated in step b).
  • This step can be implemented by the central unit 14 or, if appropriate, by the remote server.
  • the method further comprises a step f) wherein, if at least one of the measured values corresponds to at least one of the reference values, it is determined that the respective displayed image corresponds to the respective reference image.
  • This step can be implemented by the central unit 14 or, if appropriate, by the remote server.
  • the central unit 14 and / or the remote server are also adapted to process the data obtained, namely to specify the date and time when the image was displayed, the duration during which the image was displayed and the repetition rate of the image display.
  • the remote server is also adapted to indicate on which screen (s) LEDs the image has been broadcast.
  • the invention therefore makes it possible to correlate a measured electrical consumption of the LED screen with a given image with a relatively good accuracy and thus to prove that this image has been broadcast by the screen.
  • the invention also applies to a video that can be defined as a succession of images. It is thus possible to certify the content of a display whose signature is the power consumption curve of the LED screen.
  • the electrical consumption reference values of the images composing the video form a reference electrical consumption curve corresponding to the video, the power consumption of the video varies with time. By comparing this calculated reference curve with the measured consumption curves, it is possible, if necessary, to confirm the actual display of the video on the LED screen.
  • the power consumption of the LED screen is linear with the brightness of the screen. Thus, if the LED screen is set to another brightness level, it is sufficient to apply a correction factor to the measured power consumption.
  • the invention therefore proposes a method and a device that make it possible to associate a given power consumption signature with a given image and to record this signature with the aid of an electrical consumption sensor installed upstream of an LED screen. thereby providing a tangible means of proof capable of proving very reliable way the effective diffusion of a content, image or video.
EP15154364.2A 2014-02-10 2015-02-09 Verfahren und Vorrichtung zur Überprüfung der Bildanzeige auf einem elektronischen Bildschirm Withdrawn EP2905771A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1451004A FR3017479B1 (fr) 2014-02-10 2014-02-10 Procede et dispositif pour verifier un affichage d'images sur un ecran electronique

Publications (1)

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EP2905771A1 true EP2905771A1 (de) 2015-08-12

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EP15154364.2A Withdrawn EP2905771A1 (de) 2014-02-10 2015-02-09 Verfahren und Vorrichtung zur Überprüfung der Bildanzeige auf einem elektronischen Bildschirm

Country Status (4)

Country Link
US (1) US20150228221A1 (de)
EP (1) EP2905771A1 (de)
AU (1) AU2015200641A1 (de)
FR (1) FR3017479B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107068028A (zh) * 2017-05-31 2017-08-18 西安诺瓦电子科技有限公司 显示模组以及显示模组检测系统
EP3428906A1 (de) * 2017-07-11 2019-01-16 INOTEC Sicherheitstechnik GmbH Anzeigevorrichtung zur anzeige von bildern, insbesondere piktogrammen, mit der eine überprüfung des angezeigten bildes möglich ist

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3543996A4 (de) * 2016-11-18 2020-07-08 Guangdong Wlight Visual Health Research Institute Verfahren und anzeigevorrichtung zur dynamischen einstellung von lumineszenzparametern einer anzeige
TWI675590B (zh) * 2018-04-09 2019-10-21 緯創資通股份有限公司 影像播放證明系統與方法
FR3125603A1 (fr) * 2021-07-21 2023-01-27 Naixes Procede de capture d’image par canaux auxiliaires, a l’aide d’un ecran d’affichage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050052350A1 (en) * 2003-03-06 2005-03-10 Eastman Kodak Company Setting black levels in organic EL display devices
US20070290947A1 (en) * 2006-06-16 2007-12-20 Cok Ronald S Method and apparatus for compensating aging of an electroluminescent display
US20100301876A1 (en) * 2007-12-20 2010-12-02 Zf Friedrichshafen Ag Method for diagnosing an electronic disiplay device
US20110096246A1 (en) 2009-02-16 2011-04-28 Manufacturing Resources International, Inc. Visual Identifier for Images on an Electronic Display

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3106953B2 (ja) * 1996-05-16 2000-11-06 富士電機株式会社 表示素子駆動方法
JP5560077B2 (ja) * 2010-03-25 2014-07-23 パナソニック株式会社 有機ｅｌ表示装置及びその製造方法
US20120105402A1 (en) * 2010-10-27 2012-05-03 Taiwan Semiconductor Manufacturing Company, Ltd. Method and system for adjusting light output from a light source
KR101295342B1 (ko) * 2013-02-28 2013-08-12 (주)동방데이타테크놀러지 Led별 휘도 보정이 가능한 스마트 전광판 제어 시스템 및 방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050052350A1 (en) * 2003-03-06 2005-03-10 Eastman Kodak Company Setting black levels in organic EL display devices
US20070290947A1 (en) * 2006-06-16 2007-12-20 Cok Ronald S Method and apparatus for compensating aging of an electroluminescent display
US20100301876A1 (en) * 2007-12-20 2010-12-02 Zf Friedrichshafen Ag Method for diagnosing an electronic disiplay device
US20110096246A1 (en) 2009-02-16 2011-04-28 Manufacturing Resources International, Inc. Visual Identifier for Images on an Electronic Display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107068028A (zh) * 2017-05-31 2017-08-18 西安诺瓦电子科技有限公司 显示模组以及显示模组检测系统
EP3428906A1 (de) * 2017-07-11 2019-01-16 INOTEC Sicherheitstechnik GmbH Anzeigevorrichtung zur anzeige von bildern, insbesondere piktogrammen, mit der eine überprüfung des angezeigten bildes möglich ist

Also Published As

Publication number Publication date
FR3017479A1 (fr) 2015-08-14
AU2015200641A1 (en) 2015-08-27
FR3017479B1 (fr) 2017-06-23
US20150228221A1 (en) 2015-08-13

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