Near-Infrared LED Wavelength Up-Conversion for Red Light Interference
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Solution Overview
Problem
Infrared light-emitting diode chips in security monitors cause recognition interference and on-road safety issues due to the emission of red light, which is not effectively mitigated by existing miniaturization-conducive solutions.
Innovation Solution
A lighting device featuring a near-infrared light-emitting diode chip with a wavelength up-conversion structure that converts part of the emitted light into visible light, specifically between 400 nm and 700 nm, reducing red light interference by producing blue-white or green-white illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common infrared light-emitting diode chip is used, then the monitoring device can detect infrared light, but red light is emitted causing recognition interference and on-road safety issues
Solution Approach 1:
A wavelength conversion layer is introduced as an intermediary between the infrared light-emitting diode chip and the external environment. This layer converts the harmful infrared radiation into useful visible light, eliminating the red spot interference while maintaining infrared detection functionality. The conversion layer acts as a mediator that transforms the problematic wavelength into a beneficial one.
Solution Approach 2:
The patent converts the harmful infrared emission (which causes red spot interference) into beneficial visible light through wavelength conversion materials. The infrared light that was causing problems is transformed into visible illumination, turning a harmful effect into a useful function for both safety and lighting purposes.
2Object-generated harmful factors
If the infrared light-emitting diode chip and blue light-emitting diode chip are encapsulated together, then red light interference is prevented, but product miniaturization is hindered
Solution Approach 1:
The patent merges the infrared light-emitting diode chip and the wavelength conversion layer into a single integrated structure. Instead of separately encapsulating multiple chips, the solution combines the infrared LED with a conversion layer containing wavelength conversion materials, significantly reducing the overall device volume while maintaining the function of eliminating red light interference.
Solution Approach 2:
The patent changes the wavelength parameter of the emitted light by incorporating wavelength conversion materials with specific optical properties. By selecting materials with appropriate conversion characteristics, the infrared light is transformed into visible light, achieving both interference elimination and compact design without requiring multiple separate components.
3Object-generated harmful factors
If the wavelength up-conversion structure converts part of the first light into the second light, then red light interference is reduced, but the first light intensity decreases
Solution Approach 1:
The wavelength conversion layer is designed to perform partial conversion of infrared light to visible light, rather than complete conversion. This partial action approach maintains sufficient infrared light intensity for detection while converting enough to eliminate the red spot interference and provide useful visible illumination, achieving a balanced solution.
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
The solution effectively eliminates or reduces red light interference, enhancing on-road safety and preventing misidentification of license plate recognition lights as traffic lights, while maintaining miniaturization feasibility.
Implementation Method 1
the wavelength up-conversion structure is disposed on the light-emitting diode chip and is configured to convert part of the first light into a second light, which has a converted spectrum between 400 nm and 700 nm
Data Source
AI summary
A lighting device is provided. The lighting device includes a carrier, a light-emitting diode chip, and a wavelength up-conversion structure. The light-emitting diode chip is disposed on the carrier and is configured to emit a first light, which has a peak wavelength between 800 nm and 1000 nm. The wavelength up-conversion structure is disposed on the light-emitting diode chip and is configured to convert part of the first light into a second light, which has a converted spectrum between 400 nm and 700 nm.