Six-Color LED White Light Engine for High-CRI CCT Control
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Solution Overview
Problem
Existing systems struggle to efficiently calculate the current distribution required by six different color LEDs to produce high quality, temperature adjustable white light with satisfactory color quality metrics.
Innovation Solution
A digital processor calculates optimal relative intensities for six LEDs, including a combination of conventional and phosphor-converted LEDs, to produce white light with adjustable correlated color temperatures (CCT) and high color rendering index (CRI) using a matrix equation and lookup tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If six different color LEDs are used to produce high quality white light with adjustable temperature, then color rendering index (CRI) and color quality are improved, but the complexity of calculating current distribution and controlling relative intensities becomes significantly more difficult
Solution Approach 1:
The system performs preliminary calculations of optimal current distributions for six different color LEDs across a range of correlated color temperatures (CCTs) and stores these solutions in lookup tables. When operation begins, the controller simply retrieves pre-calculated values from the lookup tables based on the desired CCT, avoiding complex real-time calculations and significantly reducing control system complexity while maintaining high color quality.
2Adaptability or versatility
If six different color LEDs are used to achieve adjustable correlated color temperatures from 1700K to 20000K with CRI greater than 95, then adaptability and color quality are improved, but the device complexity and computational requirements increase
Solution Approach 1:
The system pre-calculates and stores optimal current distributions for all desired correlated color temperatures (1700K to 20000K) and luminance values in lookup tables during system setup or manufacturing. This preliminary action enables the controller to achieve any desired color temperature and luminance combination by simple table lookup and interpolation, providing wide adaptability without requiring complex real-time computational resources.
Solution Approach 2:
Instead of performing complex real-time calculations, the system creates copies of pre-calculated optimal solutions in the form of lookup tables. The controller copies relevant data from these tables based on the desired operating parameters, significantly reducing computational complexity while maintaining the ability to achieve any desired color temperature and luminance combination.
3Device complexity
If conventional LEDs with narrow spectral ranges are combined, then the system remains simple, but color rendering accuracy deteriorates compared to traditional incandescent and fluorescent lighting
Solution Approach 1:
The system uses six different color LEDs (red, amber, lime, green, cyan, blue) that each serve multiple functions: they contribute to both the overall luminance and the spectral composition required for accurate color rendering. By carefully selecting and combining these six colors, the system achieves complete spectral coverage comparable to incandescent lighting while maintaining LED advantages of longevity and energy efficiency.
Solution Approach 2:
The system combines six different LED types with distinct spectral characteristics to create a composite light source. Each LED type contributes specific wavelength ranges, and their combined output produces a continuous spectrum that accurately renders all visible colors, overcoming the limitation of individual narrow-spectrum LEDs while maintaining system simplicity through standardized LED components.
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 solution provides a compact, energy-efficient, and flexible lighting source with selectable temperature and luminance, achieving CRI greater than 95 and TLCI of 99, suitable for high-end applications in the cinema industry.
Implementation Method 1
Recent advances in LED technology have resulted in phosphor-converted devices that are both more efficient and produce a wider range of colors than conventional direct drive LEDs
Implementation Method 2
assemblies of semiconductor light emitting diodes (LEDs) to produce that white light
Data Source
AI summary
Systems and methods of producing high quality temperature adjustable white light using six different colored LEDs is disclosed. In one embodiment the six LEDs are a Red (630 nm), an Amber (589 nm), a lime LED (568 nm), a green LED (540 nm) a cyan LED (505 nm) and a blue (430 nm). Optimal relative intensities of the RGBACL LED are calculated by solving a matrix relating the CIE tristimulus values Alternatively, optimum relative intensities may be calculated for two light sources lying on a line of constant CCT value, but on opposite sides of the Planckian locus. These relative intensities for each of the light sources are then retained and adjusted as a group to obtain a single white light source of the requested CCT value lying on the Planckian locus.