Microcontroller Color Management for Solid State Lighting
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Solution Overview
Problem
Conventional control systems for solid state lighting panels face challenges in achieving accurate, uniform, and responsive color management, often resulting in undesirable output oscillations due to sensor noise and limited spectrum, which affects the natural coloring of objects illuminated by these lights.
Innovation Solution
A microcontroller-based multi-mode color management system that selectively operates in closed loop or open loop control modes based on color management reference values and sensor inputs, adjusting control modes to maintain desired color characteristics and correct for drift, using incremental values to minimize oscillations and ensure stable color output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional control systems use sensor feedback to maintain color accuracy, then color management precision is improved, but output oscillations occur due to sensor noise
Solution Approach 1:
The patent implements a feedback control mechanism where sensor readings are continuously monitored and used to adjust LED current drive levels. The controller compares actual color output measurements with target values and dynamically adjusts the LED strings to maintain color accuracy while compensating for drift, thereby resolving the contradiction between precision and stability.
2Measurement precision
If control responsiveness is increased to correct color drift quickly, then color management accuracy is improved, but oscillations from filter phase lag worsen
Solution Approach 1:
The control system dynamically adjusts its response characteristics based on operating conditions. The controller modifies filter parameters and adjustment step sizes in real-time, allowing fast response when color drift is significant while using smaller, more stable adjustments when near target values, thus balancing accuracy and response time without excessive oscillation.
3Measurement precision
If multiple solid state lamps with various colors are used to broaden spectrum, then color rendering index is improved, but device complexity increases
Solution Approach 1:
The lighting system is segmented into multiple independently controllable LED strings, each emitting different color wavelengths (e.g., red, green, blue). The controller selectively activates and adjusts the intensity of individual strings to achieve desired color mixing and broaden the spectrum, thereby improving color rendering while maintaining manageable system complexity through modular control.
Solution Approach 2:
The controller serves multiple functions: it manages color mixing by adjusting individual LED string intensities, monitors sensor feedback, performs filtering and phase compensation, and adapts to different operating conditions. This multi-functionality consolidates what could be multiple separate systems into a single integrated controller, improving color rendering without proportionally increasing overall system complexity.
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
The system provides improved color accuracy and stability by dynamically adjusting control modes and thresholds, reducing unwanted oscillations and enhancing the color rendering index of solid state lighting panels, allowing for a wider range of perceivable colors and more natural object illumination.
Implementation Method 1
Solid state lamps, such as LED's, are current-controlled devices in the sense that the intensity of the light emitted from an LED is related to the amount of current driven through the LED
Implementation Method 2
white LED lamps that include a blue-emitting LED coated with a wavelength conversion phosphor that converts some of the blue light emitted by the LED into yellow light
Data Source
AI summary
Provided are systems and methods for providing a stabilized color management system in a solid state lighting panel. Methods according to some embodiments include receiving, in the microcontroller, a color management reference value corresponding to a color characteristic of the solid state lighting panel and adjusting a control mode of the microcontroller responsive to the color management reference value.