Lighting Device Segmented LED Packages High CRI Efficacy
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Solution Overview
Problem
Current lighting devices, particularly LED-based systems, face challenges in achieving high Color Rendering Index (CRI) Ra values while maintaining efficient efficacy, especially at varying color temperatures, as they often compromise between CRI and efficacy.
Innovation Solution
The use of a combination of non-white light sources, including phosphor LEDs, and supplemental light emitters emitting in the red to orange and blue to green spectra, which are carefully selected to produce a light spectrum within 4 MacAdam Ellipses of the planckian blackbody locus, achieving CRI Ra values greater than 90 across a range of color temperatures from 2,700 K to 6,500 K.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED-based lighting systems use standard phosphor combinations, then efficacy is improved, but Color Rendering Index (CRI) Ra values deteriorate
Solution Approach 1:
The patent segments the lighting system into multiple independent LED packages, each emitting at different wavelengths (violet/blue, cyan, green, yellow-green, yellow, orange, red). This segmentation allows each package to be optimized for its specific wavelength range while collectively achieving both high efficacy and high CRI Ra values through spectral combination.
Solution Approach 2:
The patent employs a composite approach by combining multiple LED types with different phosphor materials (AlInGaP, InGaN, InAlGaP) and wavelength characteristics into a unified lighting system. This composite structure enables the system to achieve CRI Ra greater than 90 while maintaining high overall efficacy, resolving the trade-off between color rendering and energy efficiency.
2Adaptability or versatility
If lighting devices adjust color temperature, then adaptability is improved, but maintaining high CRI Ra values becomes more difficult
Solution Approach 1:
The patent implements dynamic control of color temperature by independently adjusting the intensity of each LED package through separate current control circuits. This allows the system to vary color temperature from warm white to cool white while maintaining high CRI Ra values through real-time spectral balancing, achieving both adaptability and color rendering consistency.
Solution Approach 2:
The patent changes multiple parameters simultaneously (wavelength distribution, intensity ratios, phosphor compositions) to maintain high CRI Ra across different color temperatures. By adjusting the relative contributions of each wavelength component, the system achieves versatile color temperature adjustment while preserving excellent color rendering performance.
3Reliability
If multiple supplemental light emitters are added to improve CRI, then color quality is improved, but device complexity increases
Solution Approach 1:
The patent merges seven different LED packages with distinct wavelength ranges into a single integrated lighting device. By combining these packages in one housing with unified optical design and control circuitry, the system achieves high color quality (CRI Ra > 90) while managing complexity through integration rather than separate components.
Solution Approach 2:
The patent creates a universal lighting device that performs multiple functions: it provides high CRI Ra color rendering, adjustable color temperature, and high overall efficacy. The multi-functional design integrates seven LED packages into a single device that can serve various lighting applications, reducing the need for separate specialized lighting solutions.
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 enables the creation of lighting devices with high CRI Ra values and variable color temperatures, providing improved color quality and efficacy, suitable for general and specialty illuminations, including medical applications.
Implementation Method 1
The lighting device includes a first group of non-white light sources, each of the non-white light sources comprising at least a first light source solid state light emitter and at least a first luminescent material
Implementation Method 2
a first light source solid state light emitter
Data Source
AI summary
A lighting device comprising at least one non-white light source, at least a first supplemental light emitter and at least a second supplemental light emitter. The non-white light source(s) is outside an area from 0.01 u′v′ above to below the blackbody locus, and within an area defined by curves between saturated light of wavelength 430-480 nm and 560-580 nm and line segments between saturated light of wavelength 430-580 nm and 480-560 nm. The first supplemental light emitter(s) have dominant emission wavelength of 465-540 nm. The second supplemental light emitter(s) have dominant emission wavelength of 600-640 nm.