Light Emitting Element Array Multipath Interference Suppression
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Solution Overview
Problem
Existing light emitting element arrays face interference issues due to multipath light interference, particularly when all light emitting elements emit light of the same wavelength, which affects the accuracy of three-dimensional shape measurement in applications like face authentication and augmented reality.
Innovation Solution
A light emitting element array is designed with multiple light emitting elements emitting different wavelengths arranged in a pattern such as equilateral triangles or right-angled triangles, allowing for simultaneous driving while minimizing multipath interference by ensuring longer distances between elements of the same wavelength compared to those of different wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light emitting elements emit light of the same wavelength simultaneously, then the productivity of the measurement system is improved, but light interference due to multipath increases
Solution Approach 1:
The patent changes the wavelength parameter of the light emitted by different light emitting elements. Specifically, light emitting elements arranged at different positions emit light at different wavelengths (e.g., first wavelength for elements at first positions, second wavelength for elements at second positions), which fundamentally alters the optical properties to reduce multipath interference while maintaining simultaneous operation capability
Solution Approach 2:
The patent applies different wavelengths to different spatial locations of light emitting elements. Elements at different positions in the array emit light with different wavelength characteristics, creating local differentiation in optical properties that prevents constructive interference of multipath light while preserving overall system productivity
2Area of stationary object
If light emitting elements are arranged closely to increase density, then the area of the light source is reduced, but multipath interference increases due to shorter distances between elements
Solution Approach 1:
The patent changes the wavelength parameter to differentiate between closely spaced light emitting elements. By assigning different wavelengths to elements at different positions, the system can maintain high spatial density while the wavelength differentiation prevents multipath interference that would otherwise result from the short physical distances between elements
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 configuration suppresses light interference due to multipath, enhancing the accuracy of three-dimensional shape measurement by allowing simultaneous operation of multiple light emitting elements without the need for dividing the light source into multiple banks, thus improving measurement precision and efficiency.
Implementation Method 1
a plurality of light emitting elements that emit light having different wavelengths to a detection target object
Data Source
AI summary
A light emitting element array includes: plural light emitting elements that emit light having different wavelengths to a detection target object and are arranged to be adjacent to each other.