Multi-LED Light Source Optimizing Drive Parameters for CRI
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Solution Overview
Problem
Current LED-based light sources face challenges in optimizing illumination characteristics such as color rendering index (CRI), color quality scale (CQS), luminous efficacy, and output power, particularly due to cost issues associated with wavelength optimization techniques that are only applicable for specific correlated color temperatures.
Innovation Solution
A light source comprising four or more light-emitting elements with respective emission spectra, a selection module for choosing illumination characteristics to optimize, and a computing module to calculate and apply optimized drive parameters for each element to achieve desired illumination characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wavelength optimization techniques are used to improve CRI, then color rendering performance is improved, but manufacturing cost increases due to binning requirements
Solution Approach 1:
The patent changes the approach from optimizing LED wavelengths (physical parameter) to optimizing drive parameters (electrical parameter). By adjusting current levels, pulse widths, and timing of multiple LEDs with standard wavelengths, the system achieves CRI optimization without requiring costly wavelength binning, thus resolving the contradiction between manufacturing precision and ease of manufacture
Solution Approach 2:
The system dynamically adjusts drive parameters in real-time based on feedback from sensors and computational algorithms. This dynamic optimization allows the system to achieve high CRI performance using standard LEDs by varying electrical characteristics rather than relying on fixed wavelength selection, eliminating the need for expensive manufacturing binning
2Reliability
If multiple illumination characteristics are optimized simultaneously, then overall performance is improved, but system complexity increases
Solution Approach 1:
The control system serves multiple functions: it optimizes CRI, adjusts color temperature, controls output power, and monitors performance feedback all through a single integrated computational platform. This multi-functional approach improves overall illumination performance while managing system complexity through unified control architecture
Solution Approach 2:
The system incorporates feedback mechanisms where sensors measure actual illumination characteristics and feed this information back to the control algorithm. This closed-loop feedback enables simultaneous optimization of multiple parameters by continuously adjusting drive signals based on real-time performance data, achieving high reliability without proportionally increasing complexity
3Stability of the object's composition
If feedback systems are implemented to maintain desired output, then stability is improved, but device complexity increases
Solution Approach 1:
The system performs self-diagnosis and self-adjustment through computational algorithms that process feedback data and automatically modify drive parameters. This self-service capability maintains stable output characteristics while minimizing the need for additional hardware complexity, as the control system handles optimization autonomously
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 allows for the simultaneous optimization of multiple illumination characteristics, improving the light source's performance across various applications by determining optimal intensity ratios and drive parameters, which can be adjusted for different operating temperatures, thereby enhancing CRI, CQS, and luminous efficacy.
Implementation Method 1
four or more light-emitting elements, each one of which having a respective emission spectrum
Implementation Method 2
emissions from the LED induce, and sometimes combines with, emissions from the phosphorous coating to produce the white light
Implementation Method 3
emissions from the LED induce, and sometimes combines with, emissions from the phosphorous coating to produce the white light
Data Source
AI summary
The present invention provides a light source, method, computer-readable storage medium and computer program product for optimising one or more illumination characteristic thereof. In particular, the present invention provides a light source comprising four or more light-emitting elements, or groups or arrays thereof, each one of which having a respective predefined emission spectrum which, when combined in accordance with a given intensity ratio, provide illumination at a particular color temperature. This light source may comprise an internal and/or external selection module for selecting one or more illumination characteristics to be optimised, and internal and/or external computing module for optimising drive parameters of the light source to provide the optimised illumination characteristic selected. The light source may optionally be hardwired to operate according to predefined drive parameters selected, using a method, computer-readable storage medium and/or computer program product of the present invention, in order to optimise a pre-selected illumination characteristic.