EP2220640A1 - Procédé de diagnostic d'un dispositif d'affichage électronique - Google Patents

Procédé de diagnostic d'un dispositif d'affichage électronique

Info

Publication number
EP2220640A1
EP2220640A1 EP08865880A EP08865880A EP2220640A1 EP 2220640 A1 EP2220640 A1 EP 2220640A1 EP 08865880 A EP08865880 A EP 08865880A EP 08865880 A EP08865880 A EP 08865880A EP 2220640 A1 EP2220640 A1 EP 2220640A1
Authority
EP
European Patent Office
Prior art keywords
display device
screen
image data
current consumption
change
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
EP08865880A
Other languages
German (de)
English (en)
Other versions
EP2220640B1 (fr
Inventor
Ralf Hartrampf
Ludger Rake
Andreas Giefer
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP2220640A1 publication Critical patent/EP2220640A1/fr
Application granted granted Critical
Publication of EP2220640B1 publication Critical patent/EP2220640B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • G09G3/006—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
    • 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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]

Definitions

  • the invention relates to a method for diagnosing an electronic display device with a screen and a graphics memory, are stored or changed in the image data of an image displayed or displayed by the screen. Furthermore, the invention relates to a device for carrying out the method.
  • the invention has the object to provide a way to diagnose an electronic display device, so that a faulty screen display of stored in the graphics memory image data can be detected.
  • This object is achieved by a method according to claim 1. Preferred developments are given in the subclaims.
  • a value characterizing the current consumption or the change of the current consumption of the screen or the display device becomes measured, based on the image data or the change of the image data, a current consumption or the change in the current consumption of the screen or the display device characterizing reference value is determined and compared with the measured value (measured value).
  • Each pixel has, depending on its mode of operation, a certain current consumption, which is determined, for example, by its color and / or brightness. If it is a monochromatic display device (eg in black and white), then the current consumption of each pixel depends only on its set brightness and / or whether it is switched on or off. Because the image data includes information about which pixel is to be activated, the image data can also be used to determine which pixel is causing or causing which current consumption. Thus, by summing up the power consumption determined for each pixel, the total current consumption of all pixels for an image can be determined.
  • the additional power consumption of other electronic components of the display device and / or the screen can be taken into account as an offset and added to the total current consumption of all pixels.
  • the current consumption that occurs or should occur when displaying a specific image can be determined. If the determined current consumption does not match the measured current consumption within specified tolerances, then there is an error in the display.
  • a status signal is generated as a function of the comparison, which contains, for example, information about whether there is an error in the display.
  • the screen comprises, in particular, a plurality of electrical lighting means, wherein each pixel is assigned at least one electrical lighting means and / or each pixel is formed by at least one electric lighting means.
  • each pixel has a plurality, for example three, electrical lighting means, which in particular can emit or emit light of different colors.
  • the electrical lamps are preferably light emitting diodes.
  • the or at least a part of the electrical lighting means are designed as organic light-emitting diodes (OLED).
  • the graphics memory is preferably a memory that is writable and / or readable, in particular, the graphics memory is a random access memory (RAM).
  • RAM random access memory
  • the measurement of the current consumption or the change of the current consumption preferably takes place via a measuring resistor.
  • the measurement of the current consumption or of the change in the current consumption can take place by means of an inductance whose current consumption proportional magnetic field is detected by a magnetic field-sensitive sensor.
  • the screen and / or the display device is preferably connected between a ground line and a supply line, via which the screen and / or the display device is supplied with power.
  • the measurement of the current consumption or the change of the current consumption takes place e.g. in the supply line or in the ground line.
  • the display device is used to display characters, so that it can be checked by means of the method according to the invention whether the character to be displayed is actually displayed. If different characters can be displayed and checked, they must lead to different power consumption, if the result should be unique. For example, if several characters would result in the same current consumption, one of the characters could be used to switch a specific number of pixels of a hidden screen area (ie a non-visible additional pattern is switched on). Thus, it is possible to distinguish these characters by their different current consumption, although their visible areas one cause or cause identical current consumption. Since the added number of pixels is not visible to a user because of the hidden screen area, the visual impression of the affected character does not change.
  • the number of pixels of the additional pattern is in particular equal to a value rounded up to a whole number of a quotient whose divident corresponds to the number of pixels of the screen, the divisor of the quotient being equal to a power whose base is the number two, the exponent of the quotient Potency of the resolution of the measuring system, in particular in bits, corresponds.
  • An alternative approach for distinguishing different characters that result in an equal current consumption is to decompose one of the characters into at least two sub-pictures.
  • a character to be displayed on the screen at least two fields are assigned, of which a first forms the image whose image data are stored in the graphics memory.
  • the partial images are to be selected such that their current consumption differs from a respectively previously displayed (and to be overwritten) image. This gradual loading or reloading of the image data takes place in particular so fast that it is not visible to the eye of a viewer. For this it seems rather as if all pixels are displayed simultaneously.
  • a displayed image may be deleted before loading a new image, e.g. to monitor the decreasing power consumption.
  • a current difference can be determined, which occurs when changing from one stage to a subsequent stage. If the display device is operating correctly, the measured current difference corresponds to a calculated current difference, which is determined on the basis of the image data, which are different for the two stages.
  • the invention further relates to a device having an electronic display device with a screen and a graphics memory in which image data of an image displayed or to be displayed by the display device are stored or changed, a current measuring device, by means of which the current consumption or the change of the power consumption of Screen or the display device characterizing value (measured value) is or can be measured, and an evaluation, by means of which on the basis of the image data or the change of the image data, a current consumption or the change of the current consumption of the screen or the display device characterizing reference value and determines the measured value is or can be compared.
  • This device is used in particular for carrying out the method according to the invention and can be developed according to all the configurations mentioned in this connection.
  • the method according to the invention and / or the device according to the invention are preferably used for the diagnosis or for checking the display device of a selector lever device of a motor vehicle. From such a display device, e.g. the currently engaged gear of a transmission of the vehicle is shown.
  • the current measurement can be carried out via a shunt or by means of an inductance whose magnetic field proportional to the current via a magnetic field-sensitive element, such. a Hall element is detected. Depending on the application, the current measurement can be carried out in the supply line or in the ground line.
  • a specific number of pixels can be used as a diagnosis cluster by a hidden area of the screen.
  • these pixels can be switched on and / or switched off to identify the image for additional current consumption.
  • An advantage of the invention is the extended error diagnostic capability of such display devices with regard to the possibility of error in the driver IC of an OLED display device between the graphics memory and the OLED screen. In this case, the diagnosis of the display device via the current measurement.
  • FIG. 1 is a schematic block diagram of a display device with a diagnostic circuit according to a first embodiment of the invention
  • Fig. 2 is a schematic circuit diagram of a display device with a
  • Fig. 3 are schematic representations of the contents of the graphics memory and the display of the screen of the display device and
  • FIG. 4 is a schematic circuit diagram of a display device with a diagnostic circuit according to a third embodiment of the invention.
  • a display device 1 with a graphics memory 2 and a display or screen 3 can be seen, which is supplied via a supply line 4 with electric current I. Furthermore, the display device 1 is connected to a ground line 5, via which the electric current I is dissipated.
  • the screen 3 has a plurality of LEDs 18, of which pixels of the screen 3 are formed. In a monochromatic screen corresponds to each pixel, for example, a light emitting diode 18. Bei a color screen, each pixel may have a plurality, in particular three light-emitting diodes 18, which preferably emit light of different wavelengths.
  • a measuring resistor 6 is connected, at which a voltage U drops, which is measured by means of a measuring device 7. Since the voltage U dropping across the measuring resistor 6 is proportional to the flowing current I, the measuring resistor 6 and the measuring device 7 together form a current measuring device which outputs a measured value 15 characterizing the flowing current I to an evaluating device 8 which is electrically connected to the measuring device 7 is.
  • the evaluation device 8 compares the measured value 15 with a reference value 16, which is determined on the basis of image data 14 stored in the graphics memory 2, which are supplied to the evaluation device 8. If the measured value 15 and the reference value 16 agree within predetermined tolerances, then the display device 1 operates properly.
  • the current measuring device and the evaluation device 8 thus together form a diagnostic circuit for the display device 1, wherein information about the state of the display device 1, e.g. is output as a state signal 17.
  • a display device 1 with a diagnostic circuit according to a second embodiment of the invention can be seen, wherein identical or similar features to the first embodiment are denoted by the same reference numerals as in the first embodiment.
  • the second embodiment differs only in that the measuring resistor 6 is connected in the ground line 5.
  • the measuring resistor 6 is connected in the ground line 5.
  • FIG. 4 shows a display device 1 with a diagnostic circuit according to a third embodiment of the invention, similar or identical features to the preceding embodiments being denoted by the same reference numerals as in the preceding embodiments.
  • the third embodiment differs from the second embodiment in particular in that, instead of the measuring resistor, an inductance 9 (for example an electrical coil) in the ground line 5 is switched. Alternatively, the inductance 9 could be connected in the supply line 4.
  • the current-carrying inductance 9 generates a magnetic field, which is detected by a Hall element 10, which outputs a voltage U to the measuring device 7 as a function of the magnetic field, which forms a current measuring device together with the Hall element 10 and the inductance 9.
  • a Hall element 10 which outputs a voltage U to the measuring device 7 as a function of the magnetic field, which forms a current measuring device together with the Hall element 10 and the inductance 9.
  • FIG. 3 shows an illustration of the diagnosis, wherein in the first column, the content of the graphics memory 2, in the second column, the display of the screen 3 and in the third column, a judgment is given whether a display error has occurred or not.
  • image data for the digit "1" is stored in the graphics memory 2.
  • This image data lead arithmetically to a characteristic current consumption of the display device of 2.51 mA.
  • the measured current consumption is also 2.51 mA, so that from the screen 3, the content of the graphics memory is displayed correctly.
  • An error does not exist. In this case, the two current consumption values match.
  • the measured value may also deviate from the calculated value. In spite of such a deviation, there is preferably no error if this lies within certain tolerances.
  • image data of the numeral "2" is stored in the graphics memory 2. These image data lead arithmetically to a characteristic current consumption of 2.85 mA. However, the measured current consumption is only 2.51 mA, so there is a faulty representation. As can be seen from FIG. 3, the figure “1” according to “picture 1" is displayed by the screen.
  • the measured current consumption is only 2.51 mA, so there is a faulty representation.
  • the figure “1” according to “picture 1" is displayed by the screen.

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)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

Procédé de diagnostic d'un dispositif d'affichage électronique (1) comprenant un écran (3) et une mémoire graphique (2) dans laquelle sont stockées ou modifiées des données image (14) d'une image représentée ou à représenter par l'écran (3), caractérisé en ce qu'une valeur caractérisant la consommation de courant ou la variation de la consommation de courant de l'écran (3) ou du dispositif d'affichage (1) est mesurée, et en ce qu'une valeur de référence (16) caractérisant la consommation de courant ou la variation de la consommation de courant de l'écran (3) ou du dispositif d'affichage (1) est déterminée en se basant sur les données image (14) ou sur la variation des données image (14), et est comparée avec la valeur mesurée (15).
EP08865880.2A 2007-12-20 2008-12-04 Procédé de diagnostic d'un dispositif d'affichage électronique Not-in-force EP2220640B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007062510A DE102007062510A1 (de) 2007-12-20 2007-12-20 Verfahren zur Diagnose einer elektronischen Anzeigevorrichtung
PCT/DE2008/050037 WO2009080018A1 (fr) 2007-12-20 2008-12-04 Procédé de diagnostic d'un dispositif d'affichage électronique

Publications (2)

Publication Number Publication Date
EP2220640A1 true EP2220640A1 (fr) 2010-08-25
EP2220640B1 EP2220640B1 (fr) 2016-02-17

Family

ID=40473620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08865880.2A Not-in-force EP2220640B1 (fr) 2007-12-20 2008-12-04 Procédé de diagnostic d'un dispositif d'affichage électronique

Country Status (7)

Country Link
US (1) US8410788B2 (fr)
EP (1) EP2220640B1 (fr)
JP (1) JP5473938B2 (fr)
KR (1) KR101483323B1 (fr)
CN (1) CN101903929B (fr)
DE (1) DE102007062510A1 (fr)
WO (1) WO2009080018A1 (fr)

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CA2688870A1 (fr) * 2009-11-30 2011-05-30 Ignis Innovation Inc. Procede et techniques pour ameliorer l'uniformite d'affichage
DE102010009208B4 (de) * 2010-02-25 2016-12-15 Michael Schweizer Anzeigesystem
DE102013211708B3 (de) * 2013-06-20 2014-10-09 Continental Automotive Gmbh Testverfahren für einen Bildschirm in einem Fahrzeug
FR3017479B1 (fr) * 2014-02-10 2017-06-23 Jcdecaux Sa Procede et dispositif pour verifier un affichage d'images sur un ecran electronique
CN104539946A (zh) * 2015-02-05 2015-04-22 昆山软龙格自动化技术有限公司 一种四路独立供电的图像检测装置
US9781800B2 (en) * 2015-05-21 2017-10-03 Infineon Technologies Ag Driving several light sources
DE102015012889B4 (de) 2015-10-06 2021-03-25 Audi Ag Anzeigevorrichtung und Verfahren zur Überprüfung von Anzeigeinhalten
US20170301271A1 (en) * 2015-10-28 2017-10-19 Knowck Co., Ltd. Digital signage abnormality detection method and apparatus therefor
US10832604B2 (en) 2016-04-22 2020-11-10 Nec Display Solutions, Ltd. Video monitoring method, display device, and display system
EP3343541B1 (fr) * 2016-12-30 2021-12-29 Ficosa Adas, S.L.U. Détection du fonctionnement correct ou incorrect d'un panneau d'affichage
EP3428906B1 (fr) * 2017-07-11 2021-09-08 INOTEC Sicherheitstechnik GmbH Afficheur d'images, en particulier de pictogrammes, permettant de vérifier l'image affichée
CN108205092A (zh) * 2017-12-31 2018-06-26 广州用能互联网有限公司 一种停电监测系统及方法
CN108226616A (zh) * 2017-12-31 2018-06-29 广州用能互联网有限公司 一种基于电磁场感应的无线停电监测系统及方法
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Also Published As

Publication number Publication date
DE102007062510A1 (de) 2009-07-02
US20100301876A1 (en) 2010-12-02
JP2011508901A (ja) 2011-03-17
WO2009080018A1 (fr) 2009-07-02
CN101903929A (zh) 2010-12-01
JP5473938B2 (ja) 2014-04-16
EP2220640B1 (fr) 2016-02-17
KR20100093049A (ko) 2010-08-24
US8410788B2 (en) 2013-04-02
KR101483323B1 (ko) 2015-01-15
CN101903929B (zh) 2014-12-17

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