DE102005048022A1 - Measuring head for image luminance and/or chroma measuring device, has screen, where cross section of screen is adjusted to cross section of acquisition field such that light rays are completely detected by sensor - Google Patents

Measuring head for image luminance and/or chroma measuring device, has screen, where cross section of screen is adjusted to cross section of acquisition field such that light rays are completely detected by sensor Download PDF

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Publication number
DE102005048022A1
DE102005048022A1 DE200510048022 DE102005048022A DE102005048022A1 DE 102005048022 A1 DE102005048022 A1 DE 102005048022A1 DE 200510048022 DE200510048022 DE 200510048022 DE 102005048022 A DE102005048022 A DE 102005048022A DE 102005048022 A1 DE102005048022 A1 DE 102005048022A1
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Germany
Prior art keywords
sensor
section
cross
screen
measuring head
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Ceased
Application number
DE200510048022
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German (de)
Inventor
Uwe Nagel
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Siemens AG
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Siemens AG
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Priority to DE200510048022 priority Critical patent/DE102005048022A1/en
Publication of DE102005048022A1 publication Critical patent/DE102005048022A1/en
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/06—Restricting the angle of incident light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0262—Constructional arrangements for removing stray light

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

The head has a sensor (8) detecting luminance and/or color value of light of a light source, and a screen (6), where an acquisition field of the sensor is formed in square-shape. The screen narrows the light incidence angle to the sensor, where a cross section of the screen is adjusted to the cross section of the field such that light rays radiated by a liquid crystal display (LCD) module are completely detected by the sensor. An independent claim is also included for a luminance and/or chroma measuring device comprising a measuring head.

Description

Die Erfindung betrifft einen Messkopf für ein Leuchtdichte- und/oder Chroma-Messgerät, der mindestens einen Sensor zur Erfassung der Leuchtdichte und/oder Farbwerte des Lichts einer Lichtquelle und eine Blende aufweist, wobei das Erfassungsfeld des Sensors im Wesentlichen quadratisch ausgebildet ist und die Blende den Lichteinfallswinkel zum Sensor begrenzt. Darüber hinaus betrifft die Erfindung ein Leuchtdichte- und/oder Chroma-Messgerät mit einem derartigen Messkopf.The The invention relates to a measuring head for a luminance and / or chroma meter, the at least a sensor for detecting the luminance and / or color values of Light of a light source and a diaphragm, wherein the detection field of the Sensor is formed substantially square and the aperture limits the angle of incidence to the sensor. In addition, the invention relates a luminance and / or chroma meter with such a measuring head.

Um die Leuchtdichte z. B. eines auf einem LCD-Displaymodul darstellbaren Bildes zu ermitteln, wird gewöhnlich ein Leuchtdichte-Messgerät eingesetzt. Dazu erfasst ein Messkopf zunächst ein optisches Bildsignal des LCD-Displaymoduls, wobei der Messkopf dieses Signal in ein elektrisches Signal umwandelt und dem Leuchtdichte-Messgerät zuführt. Der Messkopf weist für jede zu erfassende R-, G-, B-Farbe einen Sensor auf, dessen Erfassungsfeld im Wesentlichen quadratisch ausgebildet ist. Um zu gewährleisten, dass im Wesentlichen nur die vom LCD-Displaymodul senkrecht abgestrahlten Lichtstrahlen erfasst werden, wodurch die maximale Leuchtdichte des Lichts messbar ist, ist für jeden Sensor eine Blende mit kreisförmigem Querschnitt vorgesehen, welche den Lichteinfallswinkel zum Sensor begrenzt. Dieser Lichteinfallswinkel liegt gewöhnlich in einem Bereich von 4 Grad bis 6 Grad. Dadurch, dass die Blende mit einem kreisförmigen Querschnitt versehen ist, das Erfassungsfeld des Sensors allerdings quadratisch ausgebildet ist, sind die vom LCD-Displaymodul abgestrahlten Lichtstrahlen vom Sensor nicht vollständig erfassbar.Around the luminance z. B. one displayed on an LCD display module Getting a picture becomes common a luminance meter used. For this purpose, a measuring head first detects an optical image signal of the LCD display module, with the probe turning this signal into an electrical Convert signal and feed it to the luminance meter. The measuring head assigns for each detecting R, G, B color a sensor whose detection field is formed substantially square. To ensure, that essentially only those radiated vertically by the LCD display module Beams of light are detected, increasing the maximum luminance of the light is measurable for each sensor provides a diaphragm of circular cross-section, which limits the angle of incidence to the sensor. This angle of incidence is usually in a range of 4 degrees to 6 degrees. Because of the aperture with a circular cross-section is provided, the detection field of the sensor, however, square is formed, the radiated from the LCD display module light rays not completely from the sensor detectable.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Messkopf der eingangs genannten Art zu schaffen, mit welchem eine verbesserte Erfassung der Leuchtdichte ermöglicht wird.Of the present invention is based on the object, a measuring head of the type mentioned above, with which an improved Capture of the luminance allows becomes.

Darüber hinaus ist ein Leuchtdichte- und/oder Chroma-Messgerät mit einer verbesserten Messeigenschaft anzugeben.Furthermore is a luminance and / or chroma meter with an improved metering feature specify.

Diese Aufgabe wird im Hinblick auf den Messkopf dadurch gelöst, dass der Blendenquerschnitt im Wesentlichen dem Querschnitt des Erfassungsfeldes angepasst ist. Im Hinblick auf das Leuchtdichte- und/oder Chroma-Messgerät wird diese Aufgabe durch die im Anspruch 3 angegebenen Maßnahmen gelöst.These The task is solved with regard to the measuring head, that the diaphragm cross section substantially the cross section of the detection field is adjusted. With regard to the luminance and / or chroma meter this is Problem solved by the measures specified in claim 3.

Vorteilhaft ist, dass die erfassbaren Lichtstrahlen um ca. 21% erhöht werden, was bedeutet, dass die vom LCD-Displaymodul abgestrahlten Lichtstrahlen vom Sensor im Wesentlichen vollständig erfasst werden.Advantageous is that the detectable light rays are increased by about 21%, which means that the light rays emitted by the LCD display module Essentially completely detected by the sensor.

In einer Ausgestaltung der Erfindung weist die Blende mehrere aneinander angeordnete Elemente mit quadratischem oder wabenförmigem Querschnitt auf. Jedes Element begrenzt den Lichteinfallswinkel zum Sensor, wodurch die Bauhöhe der Blende im Vergleich zu einer einteiligen quaderförmigen Blende vermindert werden kann.In According to one embodiment of the invention, the diaphragm has a plurality of contacts arranged elements with square or honeycomb cross section on. Each element limits the angle of light to the sensor, causing the height the aperture compared to a one-piece cuboid aperture can be reduced.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung veranschaulicht ist, werden im Folgenden die Erfindung, deren Ausgestaltungen sowie Vorteile näher erläutert.Based the drawing in which an embodiment The invention is illustrated below, the invention, their embodiments and advantages explained in more detail.

Es zeigen:It demonstrate:

1 eine vereinfachte Darstellung eines Messkopfes, 1 a simplified representation of a measuring head,

2 eine vereinfachte Darstellung eines an sich bekannten Messkopfes und 2 a simplified representation of a known measuring head and

3 eine Schnittdarstellung entlang der Linie II-II gemäß 2. 3 a sectional view taken along the line II-II according to 2 ,

Es wird zunächst auf 2 und 3 verwiesen, in welchen eine vereinfachte Darstellung eines an sich bekannten Messkopfes gezeigt ist. Der Einfachheit halber ist im vorliegenden Ausführungsbeispiel lediglich ein Sensor dargestellt, gewöhnlich weist ein Messkopf für jede der R-, G-, B-Farben und die Leuchtdichte einen Sensor auf. Ein Sensor 1 mit einem im Wesentlichen quadratischen Erfassungsfeld 2 ist zur Erfassung eines optischen Signals eines hier nicht dargestellten LCD-Displaymoduls vorgesehen, wobei der Sensor 1 aus dem optischen Bildsignal ein elektrisches Signal erzeugt und einem Leuchtdichte- und/oder Chroma-Messgerät übermittelt. Eine Höhe H und ein Durchmesser d einer zylindrischen Blende 3 sind derart gewählt, dass die Blende 3 für den Fall, dass der Messkopf auf die Anzeige des LCD-Displaymoduls positioniert wird, den Einfallswinkel der Lichtstrahlen 5 zum Sensor 2 in einem Bereich von 4 Grad bis 6 Grad begrenzt. Dadurch, dass die Blende 3 einen kreisförmigen Querschnitt aufweist, das Erfassungsfeld 2 des Sensors 1 allerdings quadratisch ausgebildet ist, sind die vom LCD-Displaymodul abgestrahlten Lichtstrahlen vom Sensor 1 nicht vollständig erfassbar.It is going on first 2 and 3 referenced, in which a simplified representation of a known measuring head is shown. For the sake of simplicity, in the present embodiment, only one sensor is shown, usually has a sensor for each of the R, G, B colors and the luminance on a sensor. A sensor 1 with a substantially square detection field 2 is provided for detecting an optical signal of an LCD display module, not shown here, wherein the sensor 1 generates an electrical signal from the optical image signal and transmitted to a luminance and / or chroma meter. A height H and a diameter d of a cylindrical aperture 3 are chosen such that the aperture 3 in the event that the measuring head is positioned on the display of the LCD display module, the angle of incidence of the light rays 5 to the sensor 2 limited in a range of 4 degrees to 6 degrees. Because of the aperture 3 has a circular cross-section, the detection field 2 of the sensor 1 However, square is formed, the radiated from the LCD display module light rays from the sensor 1 not completely comprehensible.

Die Erfassung der Leuchtdichte wird dadurch verbessert, indem der Blendenquerschnitt im Wesentlichen dem Querschnitt des Erfassungsfeldes des Sensors angepasst wird. Dazu wird im Folgenden auf 1 verwiesen, in der eine Blende 6 mit mehreren quaderförmigen, dünnwandigen Elementen 7 gezeigt ist, wobei der Querschnitt der Blende 6 dem Querschnitt bzw. Erfassungsfeld eines Sensors 8 entspricht. Durch die Anpassung des Blendenquerschnitts an den Querschnitt des Sensors 8 werden die Lichtstrahlen vom Sensor 8, dessen Erfassungsfeld zu 100% genutzt wird, vollständig erfasst. Dadurch, dass die Blende 6 mehrere Elemente 7 aufweist, wobei jedes Element 7 den Lichteinfallswinkel zum Sensor 8 begrenzt, kann die Höhe A der Blende 6 im Vergleich zu einer einteiligen quaderförmigen Blende vermindert werden.The detection of the luminance is thereby improved by the diaphragm cross section is substantially adapted to the cross section of the detection field of the sensor. This will be explained below 1 referenced in which a panel 6 With several cuboid, thin-walled elements 7 is shown, wherein the cross section of the aperture 6 the cross section or detection field of a sensor 8th equivalent. By adjusting the aperture cross section to the cross section of the sensor 8th become the light beams from the sensor 8th whose coverage area is 100% used, fully recorded. Because of the aperture 6 several elements 7 having, each element 7 the angle of light to the sensor 8th limited, the height A of the aperture 6 be reduced compared to a one-piece cuboid aperture.

Claims (3)

Messkopf für ein Leuchtdichte- und/oder Chroma-Messgerät, der mindestens einen Sensor (8) zur Erfassung der Leuchtdichte und/oder Farbwerte des Lichts einer Lichtquelle und eine Blende (6) aufweist, wobei ein Erfassungsfeld (2) des Sensors (8) im Wesentlichen quadratisch ausgebildet ist und die Blende (6) den Lichteinfallswinkel zum Sensor (8) begrenzt, dadurch gekennzeichnet, dass der Blendenquerschnitt im Wesentlichen dem Querschnitt des Erfassungsfeldes (2) angepasst ist.Measuring head for a luminance and / or chroma meter, which has at least one sensor ( 8th ) for detecting the luminance and / or color values of the light of a light source and a diaphragm ( 6 ), wherein a detection field ( 2 ) of the sensor ( 8th ) is formed substantially square and the diaphragm ( 6 ) the angle of incidence to the sensor ( 8th ), characterized in that the aperture cross-section substantially the cross section of the detection field ( 2 ) is adjusted. Messkopf nach Anspruch 1, dadurch gekennzeichnet, dass die Blende (6) mehrere aneinander angeordnete Elemente (7) mit quadratischem oder wabenförmigem Querschnitt aufweist.Measuring head according to claim 1, characterized in that the diaphragm ( 6 ) several juxtaposed elements ( 7 ) having a square or honeycomb cross-section. Leuchtdichte- und/oder Chroma-Messgerät mit einem Messkopf nach Anspruch 1 oder 2.Luminance and / or Chroma meter with a Measuring head according to claim 1 or 2.
DE200510048022 2005-10-06 2005-10-06 Measuring head for image luminance and/or chroma measuring device, has screen, where cross section of screen is adjusted to cross section of acquisition field such that light rays are completely detected by sensor Ceased DE102005048022A1 (en)

Priority Applications (1)

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DE200510048022 DE102005048022A1 (en) 2005-10-06 2005-10-06 Measuring head for image luminance and/or chroma measuring device, has screen, where cross section of screen is adjusted to cross section of acquisition field such that light rays are completely detected by sensor

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DE200510048022 DE102005048022A1 (en) 2005-10-06 2005-10-06 Measuring head for image luminance and/or chroma measuring device, has screen, where cross section of screen is adjusted to cross section of acquisition field such that light rays are completely detected by sensor

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446372A (en) * 1981-07-01 1984-05-01 Honeywell Inc. Detector cold shield
US4609820A (en) * 1983-04-07 1986-09-02 Fujitsu Limited Optical shield for image sensing device
US5726443A (en) * 1996-01-18 1998-03-10 Chapman Glenn H Vision system and proximity detector
US6320652B1 (en) * 1999-01-29 2001-11-20 Minolta Co., Ltd. Optical measuring apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446372A (en) * 1981-07-01 1984-05-01 Honeywell Inc. Detector cold shield
US4609820A (en) * 1983-04-07 1986-09-02 Fujitsu Limited Optical shield for image sensing device
US5726443A (en) * 1996-01-18 1998-03-10 Chapman Glenn H Vision system and proximity detector
US6320652B1 (en) * 1999-01-29 2001-11-20 Minolta Co., Ltd. Optical measuring apparatus

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