Motor Control Lighting Development Tools Motor ... - ICC Media GmbH

LIGHTINGFigure 1. The True Color sensor MTCSiCFenables colour measurement based on theCIE1931/DIN5033 standard.mind, alternative approaches are required thatare either applied within the displays via backlightor light engine control, or allow remotemonitoring of display segments. Similar approachesare found in alternative applications,for example the lighting industry, where mixedLED light sources that require to maintainspecific colour temperature use feedback control-loopsolutions.The colour measurement of such applicationsis performed by compact JENCOLOR TrueColour sensors. Supplemented with appropriatesignal electronics, they enable new opportunitiesfor device manufacturers and inline colourmeasurement of light sources and displays.The semiconductor-based sensors with XYZinterference filters are fast, cost-efficient andenable long-term stable colour detection andabsolute colour measurement based on theCIE1931/DIN5033 standard. These sensors arecapable of measuring colour differences withinthe colour space that are beyond the capabilityof the human eye. MAZeT offers these kindsof True Color Sensor ICs in various packagesand embedded solution options including calibrationlibraries. (Sensor IC, evaluation boardsfor various applications).The True Colour sensor IC MTCS is a miniaturizedcolour sensor for colour measurementsbased on the tristimulus procedure. The differencebetween usual colour sensors with absorptionfilters and RGB detection is that theMTCS can perform colour measurements witha spectral sensitivity based on the accuracyand performance of but better than the humaneye. The standard values for the description ofthe colour areas X, Y and Z are a result of theemitted radiation and the spectral tristimulusfunction based on the colorimetric principleof True Color sensors. A nearly spectrally identicalsimulation of the CIE 1931 standard observeris required for a precise color measurementof emitted sources based on human eyeperception. The quality of the viable colourmeasurement depends on the quality of thesefactors. Every variation of the standard observervalues increases the total error of the colourmeasurement system. Depending on the task,the measurement system requires certain accuracy,as measurement error varies from thenominal value, even after a previously performedcalibration. This deviation is definedas measurement error delta (for example ∅Efor the deviation within the Lab-graph or∅u’v’ for the colour area error within theLu’v’-graph) and is used for colour measurementapplications. Certain factors like themeasurement procedure, absolute and repeataccuracy of the sensor, lighting, calibrationand disturbing sources of the system environmentare the determinants of the requestedaccuracy levels.Figure 2. The JENCOLOR sensors consist ofspectral filters that are based on human eyeperception - that is standardized in colorimetrictasks based on CIE 1931.Currently the MTCS colour sensors are theonly miniaturized sensors based on the scaledtristimulus function. The sensor signals XYZcan directly be evaluated as colour areas withinthe colour graph. After calibration and underusual measurement conditions is possible toachieve values better than the perception limitof the human eye („Better than the humaneye“; ∅E