WO2005036508A1 - Arrangement comprising a flat screen panel - Google Patents

Arrangement comprising a flat screen panel Download PDF

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Publication number
WO2005036508A1
WO2005036508A1 PCT/EP2004/011305 EP2004011305W WO2005036508A1 WO 2005036508 A1 WO2005036508 A1 WO 2005036508A1 EP 2004011305 W EP2004011305 W EP 2004011305W WO 2005036508 A1 WO2005036508 A1 WO 2005036508A1
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WO
WIPO (PCT)
Prior art keywords
sensor
converter
panel
image signal
flat screen
Prior art date
Application number
PCT/EP2004/011305
Other languages
German (de)
French (fr)
Inventor
Ralf Edelbrock
Original Assignee
Siemens Aktiengesellschaft
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Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005036508A1 publication Critical patent/WO2005036508A1/en

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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
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G2320/0693—Calibration of display systems

Definitions

  • the invention relates to an arrangement with a panel of a flat screen, with a graphics processor, to which a digitized image signal can be fed by an A / D converter, which the A / D converter generates from an analog image signal, an offset point of the A / D
  • the converter can be set in such a way that the A / D converter generates a video step 0 of the digital image signal from the smallest video level of the analog image signal.
  • the basic brightness of a panel is usually set in such a way that the smallest
  • Video level of 0 volts of an analog image signal while a black image is being displayed on the panel a video step 0 is generated. If the brightness is too low, the picture will be too dark, e.g. B. is only output at a video level of 0.1 volts at the input of the A / D converter at the output of a video step greater than 0, whereby image information and grayscale are lost. If the brightness is too high, the picture is too bright. In this case, e.g. B. at a video level of 0 volts instead of a video step 0 generates a video step 32, which also causes image information and gray levels to be lost.
  • the present invention is based on the object of specifying an arrangement of the type mentioned at the outset by means of which a brightness adjustment during a calibration phase is simplified.
  • the sensor is only visible during a calibration phase over the display surface.
  • the brightness is automatically adjusted on site, e.g. B. adjusted during use of the flat screen in the medical field, service personnel is not required.
  • One embodiment of the invention provides that the sensor can be lowered in the direction of the panel, as a result of which the distance between the sensor and the panel can be reduced, which results in better measurement results.
  • the measurement results are further improved in that sealing means are provided to shield the sensor from the ambient light. These sealants, e.g. B. in the form of sealing lips, prevent the ambient light from affecting the measurement results.
  • the senor is cleaned automatically. This largely prevents contamination of the sensor, which has a detrimental effect on the measurement results, and the time intervals for servicing the sensor can also be increased.
  • the sensor and the means for pivoting out the sensor are advantageously arranged in a recess in the frame, preferably the side frame of the flat screen, so that the sensor and pivoting means are not visible to a viewer during normal operation, i.e. outside the calibration phases.
  • FIG. 1 shows an arrangement for adjusting the brightness of an image that can be displayed on an LCD panel
  • Figure 2 shows the dependence of digitized voltage values on analog video voltages
  • Figures 3 and 4 a sensor arranged on a sensor carrier in a front and a side view and a view from above.
  • 1 denotes a graphics processor, to which an 8-bit A / D converter 2 can be used to supply a digitized image signal 3 for displaying an image on an LCD panel 4 of a flat screen.
  • the digitized image signal 3 comprises video steps from 0 to 255, which the A / D converter 2 generates from an analog image signal 5 in a voltage range from 0 volts to 0.7 volts.
  • the graphics processor 1 controls a backlight control 6, which regulates the luminance of a backlight 7 in order to achieve essentially constant luminance conditions.
  • a backlight sensor 8 is provided, which the
  • Luminance of the backlight 7 is detected, which regulates the backlight control 6 to a target luminance.
  • the graphics processor 1 transmits the digital image signal to the panel 4 via a suitable interface 9, as a result of which the image information is displayed visually.
  • FIG. 2 in which the dependence on digitized voltage values (video steps) at the output of an 8-bit A / D converter of analog video voltages (video signal) at its input is shown.
  • a first case shows a brightness that is set too low, whereby only from a video voltage of 0.1 volt on the input A / D converter output Video steps greater than 0 are present at the output of the A / D converter.
  • image information BI1 and grayscale GS1 are lost.
  • a second case the brightness is set too high, a video step 32 already being present at the output of the A / D converter with a video voltage of 0 volts at the input of the A / D converter. This also means that, compared to a correctly set brightness (straight line B), image information BI2 and grayscale B2 are lost.
  • the offset of the A / D converter is set in such a way that the A / D converter is 0 for the smallest video voltage during the display of a black image Volts at the input of the A / D converter generates a video step 0 at its output.
  • the graphics processor 1 increases the offset of the A / D converter 2 step by step during a calibration phase, with a measuring unit 10 on the front of the panel simultaneously 4 scans the optical image information of a black image displayed on the panel and detects the luminance of this black image. The measured luminance is transmitted by the measuring unit 10 to the graphic processor 1 via an A / D converter 13. In the event that the graphic processor 1 recognizes a first change in the luminance, the latter changes the offset of the A / D converter 2 via a control line St one step back, which completes the brightness adjustment.
  • the panel does not have to fill out the black image completely; it is sufficient to display the black image in a “calibration window”, this black image being faded into this window even during the display of an image in a normal operating phase of the flat screen.
  • Components of the measuring unit 10 are a sensor 11 and a Sensor carrier 12 on which the sensor 11 is mounted.
  • the sensor 11 and the sensor carrier 12 are arranged in a recess of the frame of the flat screen in a manner not visible to an observer.
  • the sensor 11 can be pivoted out essentially parallel to the panel from a rest position into a detection position in which the sensor 11 is positioned so that it is visible to the viewer.
  • the sensor 11 is preferably lowered during the pivoting out in the direction of the panel 4 such that the sensor 11 detects the
  • Luminance can be captured well without touching the panel 4.
  • the sensor 11 is pivoted back into the rest position, in which the sensor 11 and the sensor carrier 12 are in turn not visible to the viewer in the recess of the flat screen frame.
  • sealing lips are provided here, which shield the sensor 11 from the ambient light.
  • FIGS. 3 and 4 in which a sensor 15 arranged on a sensor carrier 14 in a front view (FIGS. 3a, 4a), in a side view (FIGS. 3b, 4b) and in a view from above (FIG 3c, 4c) is shown.
  • the sensor carrier 14 is rotatably mounted and can be swung out by an actuator 16 and mechanical means 17.
  • the actuator 16 e.g. B. an actuator from Nanomuscle, Internet address: http.nanomuscle.com is together with the sensor carrier 14 and the sensor 15 in one
  • the sensor 15 After the sensor 15 has been positioned, the luminance of the test image displayed on the panel in a calibration window is recorded for the duration of the calibration phase, the calibration window being able to be superimposed on the normal image. After the calibration phase, the sensor 14 is pivoted into its rest position.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

The invention relates to an arrangement comprising a panel of a flat screen and a graphic processor which is supplied with a digitized image signal by an A/D converter, said signal being generated by the A/D converter from an analog image signal. An offset point of the A/D converter can be adjusted in such a manner that the A/D converter generates a video step 0 of the digital image signal on the basis of the lowest video level of the analog image signal. Disturbing influences on the brightness of an image due to aging effects of the translucent parts of the panel, e.g. due to aging effects of the panel glass, the LCD liquid or the diffuser and/or polarizing film are reduced by taking suitable measures and the sensor is only visible during the calibration phase across the display area. The brightness is automatically adjusted on site, e.g. during use of the flat screen in the medical field, without requiring service staff.

Description

Beschreibungdescription
Anordnung mit einem Panel eines FlachbildschirmsArrangement with a panel of a flat screen
Die Erfindung betrifft eine Anordnung mit einem Panel eines Flachbildschirms, mit einem Grafikprozessor, welchem durch einen A/D-Wandler ein digitalisiertes Bildsignal zuführbar ist, das der A/D-Wandler aus einem analogen Bildsignal erzeugt, wobei ein Offsetpunkt des A/D-Wandlers derart ein- stellbar ist, dass der A/D-Wandler aus dem kleinsten Videolevel des analogen Bildsignals ein Videostep 0 des digitalen Bildsignals erzeugt.The invention relates to an arrangement with a panel of a flat screen, with a graphics processor, to which a digitized image signal can be fed by an A / D converter, which the A / D converter generates from an analog image signal, an offset point of the A / D The converter can be set in such a way that the A / D converter generates a video step 0 of the digital image signal from the smallest video level of the analog image signal.
Gewöhnlich wird in einer Werkseinstellung die Grundhelligkeit eines Panels derart eingestellt, dass aus dem kleinstenIn a factory setting, the basic brightness of a panel is usually set in such a way that the smallest
Videolevel von 0 Volt eines analogen Bildsignals während der Darstellung eines Schwarzbildes auf dem Panel ein Videostep 0 erzeugt wird. Eine zu geringe Helligkeit bewirkt ein zu dunkles Bild, da z . B. erst bei einem Videolevel von 0,1 Volt am Eingang des A/D-Wandlers an dessen Ausgang ein Videostep größer 0 ausgegeben wird, wodurch Bildinformationen und Graustufen verloren gehen. Eine zu große Helligkeit bewirkt dagegen ein zu helles Bild. In diesem Fall wird z. B. bei einem Videolevel von 0 Volt anstatt eines Videosteps 0 ein Video- step 32 erzeugt, wodurch ebenfalls Bildinformationen und Graustufen verloren gehen.Video level of 0 volts of an analog image signal while a black image is being displayed on the panel, a video step 0 is generated. If the brightness is too low, the picture will be too dark, e.g. B. is only output at a video level of 0.1 volts at the input of the A / D converter at the output of a video step greater than 0, whereby image information and grayscale are lost. If the brightness is too high, the picture is too bright. In this case, e.g. B. at a video level of 0 volts instead of a video step 0 generates a video step 32, which also causes image information and gray levels to be lost.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Anordnung der eingangs genannten Art anzugeben, durch welche ein Helligkeitsabgleich während einer Kalibrierphase vereinfacht wird.The present invention is based on the object of specifying an arrangement of the type mentioned at the outset by means of which a brightness adjustment during a calibration phase is simplified.
Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Maßnahmen gelöst.This object is achieved by the measures specified in the characterizing part of claim 1.
Vorteilhaft ist, dass einerseits störende Einflüsse auf die Helligkeit eines Bildes aufgrund von Alterungseffekten der lichtdurchlässigen Teile des Panels, z. B. aufgrund von Alterungseffekten des Panel-Glases, der LCD-Flüssigkeit oder der Diffusor- und/oder Polarisationsfolien, vermindert werden und andererseits der Sensor nur während einer Kalibrierphase über der Anzeigefläche sichtbar ist. Die Helligkeit wird automatisch vor Ort, z. B. während eines Einsatzes des Flachbildschirms im medizinischen Bereich, abgeglichen, Servicepersonal ist dazu nicht erforderlich. In einer Ausgestaltung der Erfindung ist vorgesehen, dass der Sensor in Richtung des Panels absenkbar ist, wodurch der Abstand zwischen Sensor und Panel vermindert werden kann, was bessere Messergebnisse bewirkt. Die Messergebnisse werden ferner dadurch verbessert, dass zur Abschirmung des Sensors vom Umgebungslicht Dichtmittel vor- ' gesehen sind. Diese Dichtmittel, z. B. in Form von Dichtlippen, verhindern, dass das Umgebungslicht die Messergebnisse beeinträchtigt.It is advantageous that on the one hand disturbing influences on the brightness of an image due to the aging effects of the translucent parts of the panel, e.g. B. due to aging effects of the panel glass, the LCD liquid or the diffuser and / or polarizing films, and on the other hand, the sensor is only visible during a calibration phase over the display surface. The brightness is automatically adjusted on site, e.g. B. adjusted during use of the flat screen in the medical field, service personnel is not required. One embodiment of the invention provides that the sensor can be lowered in the direction of the panel, as a result of which the distance between the sensor and the panel can be reduced, which results in better measurement results. The measurement results are further improved in that sealing means are provided to shield the sensor from the ambient light. These sealants, e.g. B. in the form of sealing lips, prevent the ambient light from affecting the measurement results.
In einer weiteren Ausgestaltung der Erfindung gemäß der im Anspruch 4 angegebenen Maßnahmen wird der Sensor automatisch gereinigt. Dadurch werden Verunreinigungen des Sensors, die sich nachteilig auf die Messergebnisse auswirken, weitgehend vermieden und darüber hinaus können die zeitlichen Abstände zur Wartung des Sensors vergrößert werden.In a further embodiment of the invention according to the measures specified in claim 4, the sensor is cleaned automatically. This largely prevents contamination of the sensor, which has a detrimental effect on the measurement results, and the time intervals for servicing the sensor can also be increased.
Vorteilhaft sind der Sensor und die Mittel zum Ausschwenken des Sensors in einer Ausnehmung des Rahmens, vorzugsweise des seitlichen Rahmens des Flachbildschirms, angeordnet, wodurch Sensor und Ausschwenkmittel während eines Normalbetriebs, also außerhalb der Kalibrierphasen, für einen Betrachter nicht sichtbar sind. Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung veranschaulicht ist, werden im Folgenden die Er- findung, deren Ausgestaltungen sowie Vorteile näher erläutert .The sensor and the means for pivoting out the sensor are advantageously arranged in a recess in the frame, preferably the side frame of the flat screen, so that the sensor and pivoting means are not visible to a viewer during normal operation, i.e. outside the calibration phases. Based on the drawing, in which an embodiment of the invention is illustrated, the following are the Finding, their configurations and advantages explained in more detail.
Es zeigen: Figur 1 eine Anordnung zur Einstellung der Helligkeit eines auf einem LCD-Panel darstellbaren Bildes,FIG. 1 shows an arrangement for adjusting the brightness of an image that can be displayed on an LCD panel,
Figur 2 die Darstellung der Abhängigkeit von digitalisierten Spannungswerten von analogen Videospannungen undFigure 2 shows the dependence of digitized voltage values on analog video voltages and
Figuren 3 und 4 einen auf einem Sensorträger angeordneten Sensor in einer Vorder- und einer Seitenansicht sowie einer Ansicht von oben.Figures 3 and 4, a sensor arranged on a sensor carrier in a front and a side view and a view from above.
In Figur 1 ist mit 1 ein Grafikprozessor bezeichnet, welchem durch einen 8-Bit A/D-Wandler 2 ein digitalisiertes Bildsignal 3 zur Darstellung eines Bildes auf einem LCD-Panel 4 eines Flachbildschirms zuführbar ist. Es ist angenommen, dass das digitalisierte Bildsignal 3 Videosteps von 0 bis 255 um- fasst, welche der A/D-Wandler 2 aus einem analogen Bildsignal 5 in einem Spannungsbereich von 0 Volt bis 0,7 Volt erzeugt. Der Grafikprozessor 1 steuert eine Backlight-Regelung 6 an, welche die Leuchtdichte eines Backlights 7 einregelt, um im Wesentlichen konstante Leuchtdichteverhältnisse zu erzielen. Dazu ist ein Backlight-Sensor 8 vorgesehen, welcher dieIn FIG. 1, 1 denotes a graphics processor, to which an 8-bit A / D converter 2 can be used to supply a digitized image signal 3 for displaying an image on an LCD panel 4 of a flat screen. It is assumed that the digitized image signal 3 comprises video steps from 0 to 255, which the A / D converter 2 generates from an analog image signal 5 in a voltage range from 0 volts to 0.7 volts. The graphics processor 1 controls a backlight control 6, which regulates the luminance of a backlight 7 in order to achieve essentially constant luminance conditions. For this purpose, a backlight sensor 8 is provided, which the
Leuchtdichte des Backlights 7 erfasst, welche die Backlight- Regelung 6 auf eine Soll-Leuchtdichte einregelt. Über eine geeignete Schnittstelle 9 übermittelt der Grafikprozessor 1 dem Panel 4 das digitale Bildsignal, wodurch die Bildinforma- tion visuell dargestellt wird.Luminance of the backlight 7 is detected, which regulates the backlight control 6 to a target luminance. The graphics processor 1 transmits the digital image signal to the panel 4 via a suitable interface 9, as a result of which the image information is displayed visually.
Im Folgenden wird auf Figur 2 verwiesen, in der die Abhängigkeit von digitalisierten Spannungswerten (Videosteps) am Ausgang eines 8-Bit A/D-Wandlers von analogen Videospannungen (Videosignal) an dessen Eingang dargestellt ist. Ein erster Fall (Gerade A) zeigt eine zu niedrig eingestellte Helligkeit, wobei erst ab einer Videospannung von 0,1 Volt am Ein- gang des A/D-Wandlers Videosteps größer 0 am Ausgang des A/D- Wandlers anliegen. Dies bewirkt, dass im Vergleich zu einer korrekt eingestellten Helligkeit (Gerade B) Bildinformationen BI1 und Graustufen GS1 verloren gehen. In einem zweiten Fall (Gerade C) ist die Helligkeit zu hoch eingestellt, wobei bereits bei einer Videospannung von 0 Volt am Eingang des A/D-Wandlers ein Videostep 32 am Ausgang des A/D-Wandlers anliegt. Dies bewirkt ebenfalls, dass im Vergleich zu einer korrekt eingestellten Helligkeit (Gerade B) Bildinformationen BI2 und Graustufen B2 verloren gehen.In the following, reference is made to FIG. 2, in which the dependence on digitized voltage values (video steps) at the output of an 8-bit A / D converter of analog video voltages (video signal) at its input is shown. A first case (straight line A) shows a brightness that is set too low, whereby only from a video voltage of 0.1 volt on the input A / D converter output Video steps greater than 0 are present at the output of the A / D converter. As a result, compared to a correctly set brightness (straight line B), image information BI1 and grayscale GS1 are lost. In a second case (straight line C) the brightness is set too high, a video step 32 already being present at the output of the A / D converter with a video voltage of 0 volts at the input of the A / D converter. This also means that, compared to a correctly set brightness (straight line B), image information BI2 and grayscale B2 are lost.
Um zu verhindern, dass eine zu geringe bzw. eine zu hohe Helligkeitseinstellung bewirkt wird, ist sicherzustellen, dass der Offset des A/D-Wandlers so eingestellt wird, dass während der Darstellung eines Schwarzbildes der A/D-Wandler für die kleinste Videospannung 0 Volt am Eingang des A/D- Wandlers einen Videostep 0 an dessen Ausgang erzeugt.In order to prevent the brightness setting from being too low or too high, it must be ensured that the offset of the A / D converter is set in such a way that the A / D converter is 0 for the smallest video voltage during the display of a black image Volts at the input of the A / D converter generates a video step 0 at its output.
Um automatisch den Offset des A/D-Wandlers 2 (Figur 1) entsprechend einzustellen, erhöht der Grafikprozessor 1 während einer Kalibrierphase den Offset des A/D-Wandlers 2 ausgehend von einem Minimum stufenweise, wobei gleichzeitig eine Messeinheit 10 an der Frontseite des Panels 4 die optische Bildinformation eines auf dem Panel dargestellten Schwarzbildes abtastet und die Leuchtdichte dieses Schwarzbildes erfasst. Die erfasste Leuchtdichte übermittelt die Messeinheit 10 dem Grafikprozessor 1 über einen A/D-Wandler 13. Für den Fall, dass der Grafikprozessor 1 eine erste Änderung der Leuchtdichte erkennt, stellt dieser über eine Steuerleitung St den Offset des A/D-Wandlers 2 um eine Stufe zurück, wodurch der Helligkeitsabgleich abgeschlossen ist.In order to automatically set the offset of the A / D converter 2 (FIG. 1) accordingly, the graphics processor 1 increases the offset of the A / D converter 2 step by step during a calibration phase, with a measuring unit 10 on the front of the panel simultaneously 4 scans the optical image information of a black image displayed on the panel and detects the luminance of this black image. The measured luminance is transmitted by the measuring unit 10 to the graphic processor 1 via an A / D converter 13. In the event that the graphic processor 1 recognizes a first change in the luminance, the latter changes the offset of the A / D converter 2 via a control line St one step back, which completes the brightness adjustment.
Das Schwarzbild braucht das Panel nicht vollständig auszufüllen, es reicht aus, das Schwarzbild in einem „Kalibrierfenster" darzustellen, wobei dieses Schwarzbild in dieses Fenster auch während der Darstellung eines Bildes in einer Normalbetriebsphase des Flachbildschirms einblendbar ist. Bestandteile der Messeinheit 10 sind ein Sensor 11 und ein Sensorträger 12, auf welchem der Sensor 11 montiert ist. Der Sensor 11 und der Sensorträger 12 sind für einen Betrachter nicht sichtbar in einer Ausnehmung des Rahmens des Flachbildschirms angeordnet. Um die Leuchtdichte des Schwarzbildes während der Kalibrierphase erfassen zu können, ist der Sensor 11 im Wesentlichen parallel zum Panel von einer Ruheposition in eine Erfassungsposition ausschwenkbar, in welcher der Sensor 11 für den Betrachter sichtbar positioniert ist. Vorzugsweise wird der Sensor 11 während des Ausschwenkens in Richtung Panel 4 derart abgesenkt, dass der Sensor 11 dieThe panel does not have to fill out the black image completely; it is sufficient to display the black image in a “calibration window”, this black image being faded into this window even during the display of an image in a normal operating phase of the flat screen. Components of the measuring unit 10 are a sensor 11 and a Sensor carrier 12 on which the sensor 11 is mounted. The sensor 11 and the sensor carrier 12 are arranged in a recess of the frame of the flat screen in a manner not visible to an observer. In order to be able to detect the luminance of the black image during the calibration phase, the sensor 11 can be pivoted out essentially parallel to the panel from a rest position into a detection position in which the sensor 11 is positioned so that it is visible to the viewer. The sensor 11 is preferably lowered during the pivoting out in the direction of the panel 4 such that the sensor 11 detects the
Leuchtdichte gut erfassen kann, ohne das Panel 4 zu berühren. Nach der Kalibrierphase wird der Sensor 11 wieder in die Ruheposition eingeschwenkt, in welcher der Sensor 11 und der Sensorträger 12 für den Betrachter wiederum nicht sichtbar in der Ausnehmung des Flachbildschirmrahmens positioniert sind.Luminance can be captured well without touching the panel 4. After the calibration phase, the sensor 11 is pivoted back into the rest position, in which the sensor 11 and the sensor carrier 12 are in turn not visible to the viewer in the recess of the flat screen frame.
Damit Umgebungslicht die Erfassung der Leuchtdichte nicht störend beeinflusst, sind hier nicht dargestellte Dichtlippen vorgesehen, welche den Sensor 11 vom Umgebungslicht abschir- men.So that ambient light does not interfere with the detection of the luminance, sealing lips, not shown, are provided here, which shield the sensor 11 from the ambient light.
Im Folgenden wird auf die Figuren 3 und 4 verwiesen, in welchen ein auf einem Sensorträger 14 angeordneter Sensor 15 in einer Vorderansicht (Fig. 3a, 4a), in einer Seitenansicht (Fig. 3b, 4b) und in einer Ansicht von oben (Fig. 3c, 4c) dargestellt ist. Der Sensorträger 14 ist drehbar gelagert und durch einen Stellantrieb 16 und mechanische Mittel 17 ausschwenkbar. Der Stellantrieb 16, z. B. ein Stellantrieb der Firma Nanomuscle, Internetadresse: http.nanomuscle.com ist zusammen mit dem Sensorträger 14 und dem Sensor 15 in einerIn the following, reference is made to FIGS. 3 and 4, in which a sensor 15 arranged on a sensor carrier 14 in a front view (FIGS. 3a, 4a), in a side view (FIGS. 3b, 4b) and in a view from above (FIG 3c, 4c) is shown. The sensor carrier 14 is rotatably mounted and can be swung out by an actuator 16 and mechanical means 17. The actuator 16, e.g. B. an actuator from Nanomuscle, Internet address: http.nanomuscle.com is together with the sensor carrier 14 and the sensor 15 in one
Ausnehmung eines Rahmens eines Flachbildschirms, vorzugsweise an einem vertikalen Teil des Rahmens, angeordnet und auf einer von dem Rahmen verdeckten, parallel zum Rahmen angeordneten Trägerplatte 18 montiert. Dadurch sind in einer Ruhe- position (Fig. 4) die Trägerplatte 18, die mechanischen Mittel 17, der Stellantrieb 16, der Sensor 15 und der Sensorträger 14 für einen Betrachter des Panels nicht sichtbar. In einer Erfassungsposition während einer Kalibrierphase (Fig. 4), in welcher der Sensor 15 die Leuchtdichte eines Panels erfasst, ist der Sensorträger 14 mit dem Sensor 15 in einem Winkel von 90 Grad ausgeschwenkt, wobei während des Ausschwenkvorgangs gleichzeitig der Sensorträger 14 in Richtung Paneloberfläche abgesenkt wird (in Fig. 4b, 4c durch Absenkhöhe H dargestellt) , um den Sensor 15 näher an der Paneloberfläche zu positionieren. Durch hier nicht dargestellte Dichtlippen wird vermieden, dass Umgebungslicht die Messergebnisse verfälscht. Nachdem der Sensor 15 positioniert ist, wird für die Dauer der Kalibrierphase die Leuchtdichte des auf dem Panel in einem Kalibrierfenster dargestellten Testbildes erfasst, wobei das Kalibrierfenster in das Normalbild einblendbar ist. Nach der Kalibrierphase wird der Sensor 14 in seine Ruheposition eingeschwenkt. Recess of a frame of a flat screen, preferably arranged on a vertical part of the frame, and mounted on a support plate 18 concealed by the frame and arranged parallel to the frame. As a result, the carrier plate 18, the mechanical means 17, the actuator 16, the sensor 15 and the sensor carrier 14 are not visible to a viewer of the panel in a rest position (FIG. 4). In a detection position during a calibration phase (FIG. 4), in which the sensor 15 detects the luminance of a panel, the sensor carrier 14 with the sensor 15 is pivoted out at an angle of 90 degrees, the sensor carrier 14 being simultaneously lowered in the direction of the panel surface during the pivoting-out process is shown (in Fig. 4b, 4c by lowering height H) in order to position the sensor 15 closer to the panel surface. Sealing lips (not shown here) prevent ambient light from falsifying the measurement results. After the sensor 15 has been positioned, the luminance of the test image displayed on the panel in a calibration window is recorded for the duration of the calibration phase, the calibration window being able to be superimposed on the normal image. After the calibration phase, the sensor 14 is pivoted into its rest position.

Claims

Patentansprüche claims
1. Anordnung mit einem Panel (4) eines Flachbildschirms, mit einem Grafikprozessor (1) , welchem durch einen A/D-Wandler (2) ein digitalisiertes Bildsignal (3) zuführbar ist, das der A/D-Wandler (2) aus einem analogen Bildsignal (5) erzeugt, wobei ein Offsetpunkt des A/D-Wandlers (2) derart einstellbar ist, dass der A/D-Wandler (2) aus dem kleinsten Videolevel des analogen Bildsignals (5) ein Videostep 0 des digitalen Bildsignals (3) erzeugt, dadurch gekennzeichnet, dass während einer Kalibrierphase1. Arrangement with a panel (4) of a flat screen, with a graphics processor (1), which can be fed through an A / D converter (2), a digitized image signal (3) that the A / D converter (2) generates an analog image signal (5), an offset point of the A / D converter (2) being adjustable such that the A / D converter (2) generates a video step 0 of the digital image signal from the smallest video level of the analog image signal (5) (3) generated, characterized in that during a calibration phase
- durch einen Sensor (11) die Leuchtdichte eines Schwarzbildes erfassbar ist, wobei der Sensor (11) in einem für einen Betrachter nicht sichtbaren Bereich des Flachbild- schirms angeordnet ist und wobei Mittel (14, 16, 17) vorgesehen sind, durch welche der Sensor (11) im Wesentlichen parallel zum Panel (4) von einer Ruheposition in eine Position zur Erfassung der Leuchtdichte ausschwenkbar ist, und - durch den Grafikprozessor (1) in Abhängigkeit einer er- fassten Leuchtdichteänderung, welche der Grafikprozessor durch ein stufenweises Verändern des Offsetpunktes bewirkt, der Offsetpunkt einstellbar ist.- The luminance of a black image can be detected by a sensor (11), the sensor (11) being arranged in an area of the flat screen which is not visible to a viewer and means (14, 16, 17) are provided by which the Sensor (11) can be pivoted essentially parallel to the panel (4) from a rest position into a position for detecting the luminance, and - by the graphics processor (1) as a function of a detected change in luminance, which the graphics processor changes by gradually changing the offset point causes the offset point is adjustable.
2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass durch die Mittel (14, 16, 17) der Sensor (11) während des Ausschwenkens in Richtung des Panels (4) absenkbar ist.2. Arrangement according to claim 1, characterized in that the means (14, 16, 17) of the sensor (11) can be lowered during pivoting out in the direction of the panel (4).
3. Anordnung nach Anspruch 1 oder 2, dadurch gekenn- zeichnet, dass zur Abschirmung des Sensors (11) vom Umgebungslicht während der Erfassung der Leuchtdichte Dichtmittel vorgesehen sind.3. Arrangement according to claim 1 or 2, characterized in that sealing means are provided to shield the sensor (11) from the ambient light during the detection of the luminance.
4. Anordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass Mittel vorgesehen sind, welche während des Ausschwenkens in die Erfassungsposition oder während des Einschwenkens in die Ruheposition den Sensor (11) reinigen.4. Arrangement according to one of claims 1 to 3, characterized in that means are provided which during the pivoting into the detection position or Clean the sensor (11) while swiveling into the rest position.
5. Anordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Sensor (11) und die Mittel (14, 16, 17) zum Ausschwenken des Sensors (11) in einer Ausnehmung des Rahmens des Flachbildschirms angeordnet sind. 5. Arrangement according to one of claims 1 to 4, characterized in that the sensor (11) and the means (14, 16, 17) for pivoting the sensor (11) are arranged in a recess in the frame of the flat screen.
PCT/EP2004/011305 2003-10-08 2004-10-08 Arrangement comprising a flat screen panel WO2005036508A1 (en)

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DE102005029790B4 (en) * 2005-06-27 2014-07-10 Eizo Gmbh Device for detecting the luminance of an image that can be displayed on an LCD display of an LCD display module

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