Subtractive Color Mixing With Additional Filter Calibration
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Solution Overview
Problem
Light fixtures, particularly those with subtractive color mixing systems and additional filters, suffer from inconsistency and high costs due to variations in emitted color across different units, which are not adequately addressed by existing technologies.
Innovation Solution
A method for controlling a subtractive color mixing system in a light fixture that includes receiving target information, calculating target control setpoints for each filter based on calibration data, and controlling the filters to achieve a desired color output, taking into account non-linear characteristics and optical properties of the filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light fixtures use subtractive color mixing systems with additional filters, then color effects and mood lighting capabilities are improved, but consistency of emitted color across different light fixtures deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring and storing calibration data for each light fixture before deployment. The system pre-determines the actual optical characteristics of each fixture's light source and filters, creating a unique calibration profile that compensates for manufacturing variations. This preliminary calibration enables consistent color output across all fixtures despite differences in component tolerances.
Solution Approach 2:
The system dynamically adjusts control parameters (PWM duty cycles) for each subtractive color filter based on the stored calibration data. By changing these parameters individually for each fixture, the system compensates for variations in light source spectrum and filter characteristics, ensuring that all fixtures produce identical target colors despite manufacturing tolerances.
2Measurement precision
If light fixtures use additional filters to enhance color rendering, then color accuracy is improved, but production costs and device complexity increase
Solution Approach 1:
The system implements feedback by using measured calibration data from each fixture to adjust control parameters in real-time. The calibration process measures the actual color output and uses this information to create a compensation model that feeds back into the control system, continuously ensuring accurate color reproduction despite component variations.
Solution Approach 2:
The patent applies preliminary action by pre-measuring and storing calibration data for each light fixture during or after assembly. This preliminary characterization of the light source and filter combination allows the system to compensate for manufacturing tolerances without requiring complex real-time sensing or adjustment mechanisms during operation.
3Ease of manufacture
If standard production tolerances are used for optical components, then manufacturing cost and ease of manufacture are improved, but color consistency across fixtures deteriorates
Solution Approach 1:
The system applies self-service by automatically measuring its own optical characteristics during calibration and using this self-generated data to compensate for manufacturing variations. Each fixture calibrates itself by measuring the actual spectrum of its light source and the transmission characteristics of its filters, then stores this information for use during operation to maintain color consistency.
Solution Approach 2:
The patent applies preliminary action by performing calibration measurements on each individual fixture before it is deployed. This pre-characterization captures the specific optical properties of each fixture's components within standard tolerances, enabling the system to compensate for variations and achieve consistent color output across all fixtures without requiring tighter manufacturing tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables consistent and cost-effective production of light with a targeted color by accounting for filter deviations and tolerances, ensuring accurate color reproduction across fixtures.
Implementation Method 1
the subtractive color mixing system, which comprises a plurality of subtractive color filters
Implementation Method 2
an additional filter... emitting light having a target color upon having traversed the additional filter
Data Source
AI summary
A method for controlling a subtractive color mixing system in a light fixture, comprising a light source, the subtractive color mixing system comprising a plurality of subtractive color filters, and an additional filter. The method is for emitting light having a target color upon having traversed the additional filter, such as upon having traversed the subtractive color mixing system and the additional filter and optionally being emitted from the light fixture. The method comprising receiving target information indicative of, such as defining, the target color, calculating a target control setpoint for each subtractive color filter within the plurality of subtractive color filters based on the target information, and calibration data, which for a plurality of sets of calibration control setpoints is indicative of an emitted color, controlling each of the subtractive color filters according to each calculated target control setpoint for each of the subtractive color filters.