Chip-on-Board Color Mixing for Warm White LED Efficiency
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Solution Overview
Problem
Current LED Chip-On-Board (COB) architectures that generate warm white light using blue LEDs and red phosphors face inefficiencies and high costs due to low quantum conversion efficiency and high costs of red phosphors.
Innovation Solution
Integrating both red and blue LEDs into a COB lighting package with a common substrate and a light conversion material covering both, allowing for high quantum conversion efficiency and cost-effective production of warm white light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red phosphors are used to convert blue light into red light, then warm white light is generated, but quantum conversion efficiency is low and cost is high
Solution Approach 1:
The patent extracts the red phosphor conversion step from the traditional blue LED + red phosphor system. Instead of using red phosphors to convert blue light, the invention directly integrates red LEDs with blue LEDs on a common substrate, eliminating the inefficient phosphor conversion process and achieving direct red light emission with high quantum efficiency
Solution Approach 2:
The patent creates a composite LED structure by integrating red and blue LEDs on a common substrate. This composite approach combines multiple light sources (red LEDs and blue LEDs) to directly produce warm white light without relying on phosphor conversion, thereby improving quantum conversion efficiency while maintaining cost-effectiveness
2Illumination intensity
If red phosphors are used to generate red light, then warm white light is achieved, but manufacturing cost increases
Solution Approach 1:
The patent removes red phosphors from the manufacturing process entirely. By integrating red LEDs directly with blue LEDs on a common substrate, the invention eliminates the need for red phosphor materials and their associated manufacturing steps, thereby reducing material costs and simplifying the production process
Solution Approach 2:
The patent merges red LEDs and blue LEDs into a single integrated COB (Chip-on-Board) package on a common substrate. This consolidation allows both red and blue light sources to be manufactured together in one process, achieving economies of scale and reducing overall manufacturing costs compared to separate production and assembly
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 results in a more efficient and cost-effective generation of warm white light, offering higher brightness and longer LED lifespan by optimizing the voltage and current distribution between red and blue LEDs, while maintaining a warm color temperature and high color rendering index.
Implementation Method 1
a light conversion material covering the plurality of blue LEDs and the at least one red LED
Data Source
AI summary
Some embodiments of the disclosure provide for a lighting system including a substrate. The lighting system includes several blue light emitting diodes (LEDs) supported by the substrate. The lighting system includes at least one red LED supported by the substrate. The lighting system includes a light conversion material covering the blue LEDs and the at least one red LED.