Multi-Anode LED Substrate for Color Stability
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Solution Overview
Problem
Conventional solid state lighting devices face challenges in achieving good efficacy, color reproduction, and color stability, particularly at high temperatures, with existing solutions like white LEDs often compromising on color rendering index (CRI) and correlated color temperature (CCT) for improved efficiency and longevity.
Innovation Solution
The development of solid state lighting devices with multiple independently controllable LEDs mounted on a substrate, utilizing a combination of blue, yellow, and red LEDs, along with lumiphors, to achieve improved color rendering and stability across a range of temperatures, with each LED being independently controllable via multiple anodes and cathodes for precise color management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple independently controllable LEDs with different wavelengths are used, then color rendering and color stability are improved, but device complexity increases due to multiple anodes and cathodes
Solution Approach 1:
The lighting device is segmented into multiple independently controllable LED groups, each with specific wavelength characteristics. By dividing the single LED into multiple segments (red, green, blue, yellow LEDs), each group can be controlled separately to maintain optimal color rendering and stability across different operating conditions, resolving the contradiction between color stability and device complexity through functional segmentation
Solution Approach 2:
The device employs dynamic control of multiple LED groups through separate anodes and cathodes, allowing real-time adjustment of each LED's contribution to the overall light output. This dynamic control enables the system to adapt to varying temperature conditions and maintain color stability by adjusting the intensity of individual LED groups based on their temperature-dependent characteristics
2Stability of the object's composition
If multiple independently controllable LEDs are used, then color rendering is improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into modular steps where each LED type (red, green, blue, yellow) can be independently mounted and connected to its dedicated anode and cathode. This segmentation allows for standardized manufacturing procedures for each LED type while maintaining the ability to achieve superior color rendering through the combination of multiple LED groups
Solution Approach 2:
The substrate structure is designed with universal mounting and connection features that can accommodate different types of LEDs (red, green, blue, yellow) using the same basic attachment and wiring procedures. This multi-functional substrate design simplifies manufacturing by providing a universal platform that handles various LED types through standardized processes
3Use of energy by moving object
If conventional white LEDs are used for improved efficiency, then energy efficiency is improved, but color reproduction deteriorates
Solution Approach 1:
The invention merges multiple LED types (red, green, blue, yellow) into a single integrated lighting device, each contributing different wavelength components to the overall light output. This combination allows the system to achieve high energy efficiency through LED technology while simultaneously providing superior color reproduction by incorporating multiple spectral components that a single white LED cannot provide
Solution Approach 2:
The lighting device uses a composite approach by combining multiple semiconductor materials with different bandgaps (corresponding to red, green, blue, and yellow LEDs) into a single system. This composite structure enables the device to leverage the high efficiency of LED technology across multiple wavelengths while achieving full-spectrum color reproduction that surpasses conventional white LEDs
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 enhances color rendering, stability, and energy efficiency, allowing for a wider variety of applications with improved color quality and reduced size, while maintaining color consistency over a range of temperatures.
Implementation Method 1
A solid state lighting device produces light (ultraviolet, visible, or infrared) by exciting electrons across the band gap between a conduction band and a valence band of a semiconductor active (light-emitting) layer, with the electron transition generating light at a wavelength that depends on the band gap
Implementation Method 2
utilizing a combination of blue, yellow, and red LEDs, along with lumiphors
Data Source
AI summary
Solid state (e.g., LED) lighting devices include multiple emitters mounted on or over a substrate comprising insulating material with conductive traces thereon, with various emitters being independently controllable with multiple pairs of anodes and cathodes that may be arranged on an opposite surface of the substrate than the emitters. Electrically conductive vias may be defined through the insulating substrate, and a molded lens may be provided over the substrate and emitters mounted thereon. Various combinations of independently controllable emitters or emitter groups may be provided, for example, a red emitter in combination with multiple blue shifted yellow (BSY) emitters, or separately controllable red, green, blue, and white (e.g., BSY) emitters.