Method for generating mixed light colors
First Claim
1. A method for generating mixed light colors from an individually pulse-time-controllable energization of light sources (11) for colors having brightness which are influenceable by varying periodically successive duty ratios of a current flowing via the respective light source (11), wherein apart from a constant current intensity of a regular energization, at least one lower constant current intensity is made available for the light sources and the current intensity of the current flowing via one of the light sources (11), with a simultaneous lengthening of the current flow time span within the period (P), is reduced to said at least one lower constant current intensity, wherein an arising total current-time integral corresponds to a current-time integral of the duty ratio predetermined for the period, and a current-dependent drift of a color locus of the light of this light source (11) is compensated for by a changed driving of different-colored light sources.
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Abstract
A method for avoiding physiological phenomena such as color separation or stroboscopic effects that occur under boundary conditions in the case of intermittent feeding in particular of light-emitting diodes, for additive superposition to form color-locus-variable mixed light, whereby the emission brightness that can be represented by a periodic duty ratio of a pulse-time-modulated constant current feeding—preferably within the respective period—is realized by changeover to other or between different constant current intensities in such a way that a brightness equivalent, namely once again the current-time integral of the predetermined, brightness-determining duty ratio, arises in the current area sum, which now preferably no longer exhibits gaps over the period.
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12 Claims
- 1. A method for generating mixed light colors from an individually pulse-time-controllable energization of light sources (11) for colors having brightness which are influenceable by varying periodically successive duty ratios of a current flowing via the respective light source (11), wherein apart from a constant current intensity of a regular energization, at least one lower constant current intensity is made available for the light sources and the current intensity of the current flowing via one of the light sources (11), with a simultaneous lengthening of the current flow time span within the period (P), is reduced to said at least one lower constant current intensity, wherein an arising total current-time integral corresponds to a current-time integral of the duty ratio predetermined for the period, and a current-dependent drift of a color locus of the light of this light source (11) is compensated for by a changed driving of different-colored light sources.
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