VCSEL Array Light Source Irregular Pattern Design
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Solution Overview
Problem
Existing VCSEL arrays for 3D imaging suffer from low irrelevance of light sources, making it challenging to achieve high precision in structured light depth measurement, particularly in miniaturized and high-performance depth cameras.
Innovation Solution
A VCSEL array light source is designed with a two-dimensional arrangement of sub-arrays, where sub-arrays are transformed through translation, rotation, mirroring, and scaling to achieve high irrelevance, allowing for the arrangement of VCSEL light sources in irregular patterns on a semiconductor substrate, which enhances the irrelevance of the overall light source distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If VCSEL light sources are arranged in a regular grid pattern on a small substrate, then the device size is minimized, but the irrelevance of light source distribution is insufficient for high-precision 3D imaging
Solution Approach 1:
The VCSEL array is divided into multiple sub-arrays, each with its own transformation parameters. This segmentation allows independent optimization of each sub-array's contribution to the overall irregular pattern, achieving high irrelevance while maintaining compact substrate size.
Solution Approach 2:
Different sub-arrays are assigned different transformation parameters (translation vectors, rotation angles, scaling factors) to create asymmetric distributions. This asymmetry breaks the regularity of simple grid patterns, generating the irregular light source distribution required for high-precision structured light 3D imaging.
2Measurement precision
If VCSEL light sources are arranged in an irregular pattern to achieve high irrelevance, then the measurement precision is improved, but the design and manufacturing complexity increases
Solution Approach 1:
A set of transformation parameters (translation, rotation, scaling) serves multiple functions: it defines the position, orientation, and size of each sub-array simultaneously. This universal parameter system simplifies the design process compared to individually positioning each VCSEL element.
Solution Approach 2:
The invention uses parameter changes (translation vectors, rotation angles, scaling factors) to generate diverse sub-array configurations from a base pattern. This parametric approach allows systematic exploration of design spaces and simplifies manufacturing by reducing the number of independent design variables.
3Measurement precision
If multiple sub-arrays with different transformations are used to achieve high irrelevance, then the 3D imaging precision is improved, but the light source arrangement complexity increases
Solution Approach 1:
Multiple sub-arrays are nested within the overall VCSEL array structure, with each sub-array containing transformed versions of base patterns. This nested organization allows hierarchical management of complexity, where global transformation parameters control local sub-array configurations.
Data Source
AI summary
The present disclosure discloses a VCSEL array light source, a pattern design method for the VCSEL array light source, a laser projection apparatus, and a three-dimensional (3D) imaging device. The VCSEL array light source includes a semiconductor substrate and a plurality of VCSEL light sources arranged on the semiconductor substrate in a two-dimensional array. The two-dimensional array includes at least one sub-array and is generated by transforming the at least one sub-array.