Multi-Wavelength Light Source Device with Nanostructure Reflective Layers
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Solution Overview
Problem
Existing sensors, such as those in mobile and wearable devices, face challenges in reducing size and power consumption while accommodating multiple optical components, which affects design precision and manufacturing conditions due to the need for various light sources and optical components.
Innovation Solution
A multi-wavelength light source device with a monolithic structure, featuring first and second light emitting elements with quantum well structures and nanostructure reflective layers, allowing for selective emission of different wavelengths and polarizations, integrated with a nanostructure light modulation layer for structured or uniform light modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate light sources and optical components are used to achieve multi-wavelength emission, then wavelength diversity is improved, but device volume and structural complexity increase
Solution Approach 1:
The patent merges multiple light emitting elements with different quantum well structures into a single integrated light source device. Different quantum well layers emit different wavelengths (e.g., red, green, blue) within one compact device, eliminating the need for multiple separate light sources and reducing overall device volume while maintaining wavelength diversity
Solution Approach 2:
The light source device achieves multi-functionality by incorporating multiple quantum well structures that can emit different wavelengths from a single device. This universal design allows one device to perform the functions of multiple separate light sources, supporting various sensor applications including depth sensing, face recognition, and iris authentication
2Adaptability or versatility
If multiple separate light sources and optical components are used to achieve multi-wavelength emission, then wavelength diversity is improved, but manufacturing precision requirements increase
Solution Approach 1:
By combining multiple quantum well light emitting elements into a single integrated device with unified packaging, the patent reduces the number of optical components and assembly steps. This merging approach simplifies manufacturing processes and reduces precision requirements compared to assembling multiple separate light sources and optical components
3Adaptability or versatility
If multiple separate light sources are used to emit different wavelengths, then wavelength coverage is improved, but power consumption increases
Solution Approach 1:
The integrated light source device combines multiple quantum well structures that can be selectively activated. By merging the light emitting functions into one device with shared control electronics and packaging, the patent reduces overall power consumption compared to operating multiple separate light sources, while maintaining the ability to emit across different wavelength ranges
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
Enables compact, efficient emission of multiple wavelengths, facilitating advanced applications like face recognition and iris authentication with reduced volume and power consumption, enhancing sensor design precision and functionality.
Implementation Method 1
a first light emitting layer configured to emit light of a first wavelength
Implementation Method 2
a second light emitting layer configured to generate light of a second wavelength different from the first wavelength
Implementation Method 3
a first reflective layer and a first nanostructure reflective layer forming a first resonance cavity configured to emit light of the first wavelength
Implementation Method 4
a second reflective layer and a second nanostructure reflective layer forming a second resonance cavity configured to emit light of the second wavelength
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is a light source device including a substrate, a first light emitting element disposed on the substrate and including a first reflective layer, a second light emitting layer configured to emit light of a second wavelength, a first etch stop layer, a first light emitting layer configured to emit light of a first wavelength different from the second wavelength, and a first nanostructure reflective layer, and a second light emitting element disposed on the substrate, spaced apart from the first light emitting element, and comprising a second reflective layer having same material and thickness as the first reflective layer, a third light emitting layer having same material and structure as the second emitting layer and configured to generate light of the second wavelength, a second etch stop layer having same material and thickness as the first etch stop layer, and a second nanostructure reflective layer.