Dual-Conversion LED Structure for Concealed Color Night Illumination
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Solution Overview
Problem
Infrared light illumination equipment using infrared light emitting diodes has limitations, as dark red light can be observed from a short distance, and photos taken with such equipment, even with night vision lenses, often result in black and white images that fail to reflect actual object colors.
Innovation Solution
A light emitting diode structure comprising a blue LED chip, a first light conversion layer with near-infrared phosphors, and a second light conversion layer with visible light phosphors, which superpose to generate a working light beam with a spectrum spanning 350 nm to 1000 nm, with higher power in the near-infrared range, enhancing concealment and color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If infrared light emitting diodes are used to provide illumination, then the concealment of surveillance cameras is improved, but dark red light can be observed by naked eyes from a short distance
Solution Approach 1:
The patent segments the light emission into two distinct wavelength ranges by using separate light conversion layers: one layer converts blue light to near-infrared (660-1000nm) and another converts to visible red (600-660nm). This segmentation allows independent optimization of each wavelength range to achieve both concealment and adequate illumination without observable dark red light leakage
Solution Approach 2:
The patent changes the spectral parameters of the emitted light by selecting specific phosphor materials with defined emission characteristics. The near-infrared phosphor is chosen to emit exclusively in the 660-1000nm range, while the red phosphor emits in 600-660nm, creating a composite spectrum that eliminates the problematic dark red observable range while maintaining effective illumination
2Reliability
If infrared light emitting diodes are used with night vision lenses, then continuous video recording in dim light is enabled, but photos turn out black and white and cannot reflect actual colors of objects
Solution Approach 1:
The patent merges two light conversion functions into a single LED structure: one conversion path produces near-infrared light for night vision lens operation, while the other produces visible red light for color capture. This merging allows both functions to operate simultaneously from one light source, enabling color photography in dim conditions while maintaining video recording capability
Solution Approach 2:
The light emitting diode structure achieves multi-functionality by simultaneously providing near-infrared illumination (effective for night vision lenses and video recording) and visible red illumination (effective for color photography). This universal light source eliminates the need for separate infrared and visible light sources, enabling both video and photo functions to work effectively in dim light
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 allows for near-infrared and visible light emission, ensuring the light emitting diode structure is not easily observable and provides sufficient visible light for color representation in dim conditions, suitable for surveillance applications.
Implementation Method 1
The first light conversion layer is disposed on the light emitting unit to convert a part of the first light beam into a second light beam
Implementation Method 2
The second light conversion layer is disposed on the first light conversion layer to convert another part of the first light beam into a third light beam
Data Source
AI summary
A light emitting diode structure including a light emitting unit having a blue LED chip to produce a first light beam, a first light conversion layer disposed on the light emitting unit to convert a part of the first light beam into a second light beam, and a second light conversion layer disposed on the first light conversion layer to convert another part of the first light beam into a third light beam is provided. A remaining part of the first light beam, the second light beam, and the third light beam are superposed to form a working light beam whose spectrum includes a first wave band ranging from 350 nm to 660 nm and a second wave band ranging from 660 nm to 1000 nm. A power of the working light beam in the second wave band is higher than that in the first wave band.