Solid State Illumination System Enhanced Color Contrast
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Solution Overview
Problem
Current solid-state lighting systems lack a method to quantify and achieve the appealing enhanced color contrast of incandescent bulbs like REVEAL®, which is essential for providing energy-efficient lighting with desirable color quality.
Innovation Solution
The development of organic electroluminescent-based and inorganic light emitting diode-based illumination systems that exhibit a correlated color temperature between 2000 K and 20000 K, utilizing a combination of organic and inorganic light emitting diodes, filters, and photoluminescent materials to produce white light with enhanced color contrast, characterized by specific delta chroma values on the Color Quality Scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solid-state light emitting elements are used to improve energy efficiency, then energy consumption is reduced, but color quality and enhanced color contrast are compromised
Solution Approach 1:
The illumination system is divided into multiple independent light emitting elements with different spectral characteristics (first LED with peak wavelength 430-480nm, second LED with peak wavelength 560-680nm, and optionally third LED with peak wavelength 280-400nm). Each element contributes differently to the overall spectrum, allowing energy-efficient solid-state operation while achieving enhanced color contrast through selective wavelength combination.
Solution Approach 2:
The system combines multiple light emitting materials with different emission characteristics to create a composite illumination source. This includes using organic electroluminescent elements and/or inorganic light emitting diodes with complementary spectral outputs, optionally enhanced with photoluminescent materials and filters, to achieve the desired color quality metrics that mimic or exceed incandescent performance.
2Illumination intensity
If solid-state illumination systems are designed to match REVEAL® color quality, then color rendering is improved, but manufacturing complexity increases due to lack of standardized methods
Solution Approach 1:
The patent establishes specific parameter ranges for manufacturing: first LED peak wavelength 430-480nm, second LED peak wavelength 560-680nm, third LED peak wavelength 280-400nm (when used), correlated color temperature 2000-20000K, and delta chroma values for 15 color samples. These quantified parameters provide a standardized manufacturing framework that simplifies production while ensuring consistent color quality performance.
Solution Approach 2:
The patent replaces subjective visual assessment of color quality with objective measurement and calculation methods. Delta chroma values are calculated for 15 standardized color samples and compared against reference values, providing a quantifiable manufacturing specification that eliminates the need for subjective quality control and standardizes production processes.
3Illumination intensity
If multiple light emitting elements with different wavelengths are combined to achieve enhanced color contrast, then color quality is improved, but device complexity increases
Solution Approach 1:
Multiple light emitting elements with different spectral characteristics are merged into a single illumination system. The first LED (430-480nm peak), second LED (560-680nm peak), and optionally third LED (280-400nm peak) are combined with photoluminescent materials and filters to produce integrated white light output with enhanced color contrast, achieving superior color rendering while maintaining a unified device structure.
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 systems provide improved color contrast and appealing color quality, making objects appear more vibrant and natural, similar to REVEAL® incandescent bulbs, while being energy-efficient and durable.
Implementation Method 1
An embodiment of the present invention is directed to an organic electroluminescent-based illumination system... Another embodiment of the present invention is directed to an inorganic light emitting diode-based illumination system
Implementation Method 2
The system comprises a plurality of inorganic light emitting diodes, wherein at least two inorganic light emitting diodes have different color emission bands
Implementation Method 3
optionally at least one photoluminescent material
Implementation Method 4
optionally at least one filter
Data Source
AI summary
Disclosed herein are solid state illumination systems which provide improved color quality and/or color contrast. The systems provide total light having delta chroma values for each of the fifteen color samples of the color quality scale that are preselected to provide enhanced color contrast relative to an incandescent or blackbody light source, in accordance with specified values which depend on color temperature. Illumination systems provided herein may comprise one or more organic electroluminescent element, or they may comprise a plurality of inorganic light emitting diodes, wherein at least two inorganic light emitting diodes have different color emission bands. Methods for the manufacture of illumination systems having improved color quality and/or color contrast are also provided.