High CRI Solid State Lighting with Enhanced Vividness
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Solution Overview
Problem
Current solid state lighting devices, such as LEDs, often fail to achieve desirable illumination characteristics like high color rendering index (CRI Ra) and gamut area index (GAI) values, which are essential for accurately reproducing colors and providing vivid lighting, as they typically fall short of the Class A color designation standards.
Innovation Solution
The development of solid state lighting devices that incorporate multiple electrically activated light emitters, including primary and supplemental LEDs, and lumiphors, which emit light within specific wavelength ranges to produce a mixture of light with CRI Ra values of at least 80 and GAI values between 80 and 100, positioning the color point within predefined regions of the 1931 CIE Chromaticity diagram, thereby enhancing vividness and meeting Class A color standards without the use of notch filtering materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional solid state lighting devices use simple LED configurations, then device complexity is low, but color rendering index (CRI Ra) and gamut area index (GAI) values are insufficient
Solution Approach 1:
The lighting device divides the light emission function into multiple specialized emitters: a first plurality of LEDs emitting in the 400-480nm range, a second plurality of LEDs emitting in the 560-680nm range, and optionally a third plurality for 380-420nm. This segmentation allows each emitter group to target specific spectral regions, achieving superior CRI Ra (≥80) and GAI (80-100) values while maintaining manageable device complexity through modular architecture.
2Manufacturing precision
If notch filtering materials are used to improve color rendering, then CRI Ra and GAI values increase, but luminous efficacy decreases and heat dissipation requirements increase
Solution Approach 1:
The invention extracts and eliminates the need for notch filtering materials by directly generating the desired spectral output through carefully selected LED emitters. By using multiple LED types with complementary wavelength ranges and combining their emissions, the device achieves Class A color rendering (CRI Ra ≥80, GAI 80-100) without the energy losses and heat generation associated with filtering approaches.
Solution Approach 2:
The invention replaces the mechanical/optical filtering system (notch filters) with an electrical/optical generation system (multiple LED types). Instead of using filters to remove unwanted wavelengths from a broad spectrum source, the device uses multiple targeted LED emitters to directly produce the desired spectral composition, thereby eliminating the energy losses inherent in filtering approaches.
3Manufacturing precision
If multiple LED types with specific wavelength ranges are combined, then CRI Ra ≥80 and GAI 80-100 are achieved, but device complexity increases
Solution Approach 1:
The lighting device achieves multi-functionality by combining LEDs from different wavelength ranges within a single integrated structure. The first plurality of LEDs (400-480nm), second plurality (560-680nm), and optional third plurality (380-420nm) work together to simultaneously provide high CRI Ra, controlled GAI, and various color temperatures (2000K-20000K), making the device adaptable to multiple lighting applications while maintaining a unified design.
4Device complexity
If blue LED with yellow phosphor is used to generate white light, then device structure is simple, but color rendering accuracy and vividness are insufficient
Solution Approach 1:
The invention employs a composite emitter system combining multiple LED types with distinct wavelength characteristics rather than relying on a single LED type with phosphor conversion. By integrating LEDs emitting in the 400-480nm range, 560-680nm range, and optionally 380-420nm range, the device creates a composite spectral output that achieves superior color rendering (CRI Ra ≥80) and vividness (GAI 80-100) while maintaining structural simplicity through direct emission rather than conversion.
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
These devices simultaneously achieve high CRI Ra and GAI values, providing enhanced color reproduction and vividness, meeting Class A color standards, and maintaining high luminous efficacy without the need for notch filtering materials, which would otherwise reduce luminous efficacy and require additional heat dissipation structures.
Implementation Method 1
Solid state emitters may include lumiphoric materials (also known as lumiphors) that absorb a portion of emissions having a first peak wavelength emitted by the emitter and re-emit light having a second peak wavelength that differs from the first peak wavelength.
Implementation Method 2
a blue light emitting diode (LED) and a lumiphor such as a yellow phosphor
Data Source
AI summary
Solid state lighting devices including multiple solid state light emitters are arranged to produce a mixture of light having a color rendering index (CRI Ra) value of at least 80, having a gamut area index (GAI) value in a range of from 80 to 100, and x, y coordinates within a predefined region of a 1931 CIE Chromaticity diagram, e.g. including x, y coordinates defining point on or within a first polygon bounded by the following x, y coordinates: (0.38, 0.34), (0.38, 0.36), (0.40, 0.38), (0.42, 0.38), (0.44, 0.36), (0.46, 0.36), and (0.46, 0.34). In certain embodiments, a lighting device includes a primary emitter having a dominant wavelength in a range of from 430 to 480 nm, a lumiphor having a dominant wavelength in a range of from 535 to 585 nm, and a supplemental emitter having a dominant wavelength in a range of from 590 to 650 nm.