Method and arrangement for simulation of high-quality daylight spectra
First Claim
1. Method for simulation of high-quality daylight or artificial light spectra at color temperatures in the range of 2,700 K to 10,000 K, particularly for the purpose of lighting matching surfaces in comparative color matching of prints, textiles, and similar products, having defined, predetermined color characteristics, comprising the following method steps:
- a) producing light by means of a plurality of LEDs disposed in groups, wherebyeach group is formed from LEDs positioned in a compact manner next to one another, andthe LEDs within each group emit light at different wavelengths, so thatlight of a specific spectrum to be simulated is emitted by each group,b) measuring the spectra of the light emitted by each individual LED at different predetermined working temperatures,c) calculating the tristimulus values XYZ for each measured temperature range, by linear interpolation of the intermediate values,d) storing the calculated tristimulus values in a memory, with assignment to the working temperatures and PWM values as color characteristics for each LED,e) actuating the LEDs at the working temperatures and PWM values selected from the memory content, as a function of the spectrum to be simulated,f) during a predetermined cycle frequency, constantly repeatedly measuring the working temperature of each individual LED group and comparing it with the tristimulus values stored in memory with regard to the working temperatures,g) in case of agreement of a current measurement result with the stored value;
continuing to actuate the LED in question at the previous values for the same working temperature,h) in case of deviation of the current working temperature from the stored value;
determining the tristimulus values that belong to the current working temperature and/or a suitable PWM value from the memory content assigned to this LED.
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Accused Products
Abstract
A method and a multispectral color coordination system simulates high-quality daylight spectra. Light is produced with LEDs disposed in groups. Each group emits light at different wavelengths within the daylight spectrum. The wavelength of the light emitted by each LED at different working temperatures and different PWM values is measured. The measurement results for each LED are stored in memory, with assignment to working temperatures and PWM values. The LEDs are actuated at values selected from the memory content, as a function of the light to be emitted by each group. The working temperature of each individual LED chip is constantly measured and compared with the values stored in memory with regard to the current working temperature, and, in case of deviation compensated for by recalculating the spectrum, taking into consideration the PWM values stored in memory for the working temperature, and actuating with these.
6 Citations
9 Claims
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1. Method for simulation of high-quality daylight or artificial light spectra at color temperatures in the range of 2,700 K to 10,000 K, particularly for the purpose of lighting matching surfaces in comparative color matching of prints, textiles, and similar products, having defined, predetermined color characteristics, comprising the following method steps:
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a) producing light by means of a plurality of LEDs disposed in groups, whereby each group is formed from LEDs positioned in a compact manner next to one another, and the LEDs within each group emit light at different wavelengths, so that light of a specific spectrum to be simulated is emitted by each group, b) measuring the spectra of the light emitted by each individual LED at different predetermined working temperatures, c) calculating the tristimulus values XYZ for each measured temperature range, by linear interpolation of the intermediate values, d) storing the calculated tristimulus values in a memory, with assignment to the working temperatures and PWM values as color characteristics for each LED, e) actuating the LEDs at the working temperatures and PWM values selected from the memory content, as a function of the spectrum to be simulated, f) during a predetermined cycle frequency, constantly repeatedly measuring the working temperature of each individual LED group and comparing it with the tristimulus values stored in memory with regard to the working temperatures, g) in case of agreement of a current measurement result with the stored value;
continuing to actuate the LED in question at the previous values for the same working temperature,h) in case of deviation of the current working temperature from the stored value;
determining the tristimulus values that belong to the current working temperature and/or a suitable PWM value from the memory content assigned to this LED. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Multispectral color coordination system, particularly for the purpose of lighting matching surfaces in comparison color matching of prints, textiles, and similar products, having defined, predetermined color characteristics, comprising:
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multiple groups of LEDs disposed on a base surface, next to one another, whereby each group is formed from LEDs disposed next to one another in a compact manner, which emit light at different wavelengths that lie within a spectrum of 380 nm to 700 nm, a first measurement device, configured for wavelength measurement of the light emitted by each individual LED, as a function of an actuation with different PWM values and a setting of different working temperatures, a measurement value memory unit for storing tristimulus values XYZ determined from the spectra, with assignment to the PWM and working temperature values, a second measurement device, configured for constantly repeated measurement, at a predetermined cycle frequency, of the working temperature of each individual LED group, and for comparison with the tristimulus values XYZ assigned to the working temperature, stored in the memory of the first measurement device, a computer unit connected with the measurement value memory unit, configured for determining corrected PWM values and working temperatures for each individual LED, as a function of deviations of the current tristimulus values from the stored measurement value, and an actuation circuit for actuating the LED in question, with values corrected for the purpose of compensating the deviation. - View Dependent Claims (8, 9)
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Specification