Perceptually Uniform LED Color Tuning Control
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Solution Overview
Problem
Current LED color tuning technologies lack the ability to control color temperature and Duv direction effectively, resulting in limited color rendering index and non-uniform user control experiences, especially in applications requiring high CRI and tunable lighting.
Innovation Solution
The use of desaturated Red-Green-Blue (RGB) LEDs with advanced phosphor-converted color LEDs, combined with multichannel DC-to-DC converters and single-channel constant-current drivers, allows for smooth and visually pleasant color temperature tuning by controlling CCT and Duv, enabling high CRI and wide tunable color-temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If white LEDs of two or more CCTs are used for color tuning, then the implementation is simple, but the capability to tune LEDs in the Duv direction is lost
Solution Approach 1:
The patent combines multiple LED types (warm white LED, cool white LED, and at least one colored LED) into a single lighting system. This merging allows the system to achieve both CCT tuning (through warm/cool white LED ratios) and Duv tuning (through colored LED addition) simultaneously, resolving the contradiction between implementation simplicity and Duv tuning capability.
2Adaptability or versatility
If a combination of Red/Green/Blue/Amber colors is used for color tuning, then Duv direction tuning capability is available, but the color tuning capability is seldom offered as an available function and complexity increases
Solution Approach 1:
The control device is designed to provide multiple functions: it can control both CCT tuning and Duv tuning, and can operate in different modes (first mode for CCT-only control, second mode for combined CCT and Duv control). This multi-functionality allows the system to offer comprehensive color tuning capability while managing complexity through mode-based operation.
Solution Approach 2:
The control device dynamically adjusts its behavior based on operating mode. In the first mode, it provides simple CCT tuning similar to conventional systems. In the second mode, it enables advanced CCT and Duv tuning. This dynamic adaptation allows the system to balance complexity and capability based on user needs.
3Ease of operation
If conventional CCT control is used, then the control mechanism is simple, but the color-tuning experience is non-uniform and CRI is limited
Solution Approach 1:
The system uses feedback mechanisms where the control device receives control inputs and adjusts LED output based on desired color temperature and CRI targets. The control algorithm calculates appropriate drive currents for each LED type to achieve uniform perceptual color tuning across the tuning range, resolving the non-uniformity issue while maintaining simple user interaction.
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
This approach provides a perceptually uniform color-tuning experience with high CRI and broad color-temperature ranges, enhancing human-centric lighting capabilities by allowing users to adjust correlated color temperature and light intensity simultaneously.
Implementation Method 1
The use of desaturated Red-Green-Blue (RGB) LEDs with advanced phosphor-converted color LEDs
Data Source
AI summary
Various embodiments include apparatuses and methods control apparatus to color tune a light-emitting diode (LED) array. In one specific example, a control apparatus to color tune a light-emitting diode (LED) array for perceptually uniform color-tuning is disclosed. The apparatus includes a correlated color temperature (CCT)-control device that is adjustable by an end-user to a desired color temperature of the LED array and producing an output signal corresponding to the desired color temperature. A storage device is electrically coupled to the CCT-control device to correlate a mechanical movement range of the CCT-control device to provide substantially uniform increases in perceptual CCT values from the LED array based on a set of N predetermined values. Other apparatuses and methods are described.