SPAD ToF Sensor Mode Switching for Wide-Range Distance Sensing
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Solution Overview
Problem
Combining distance measuring sensors with different methods increases device scale and cost, making it challenging to achieve wide-ranging and accurate distance measurements efficiently.
Innovation Solution
A distance measuring sensor and system utilizing SPAD pixels that include a time-of-flight data processing unit and a viewing data processing unit, allowing for both direct and indirect time-of-flight measurements using a single photon avalanche diode (SPAD) as a photoelectric conversion element, enabling flexible measurement modes and reducing component complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple distance measuring sensors with different measurement methods are combined, then measurement range and accuracy are improved, but device scale and cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling a single distance measuring sensor to perform both direct ToF measurement and indirect ToF measurement through software control. The sensor can switch between measurement modes based on distance requirements, eliminating the need for multiple dedicated sensors and reducing device scale while maintaining comprehensive measurement capabilities.
2Adaptability or versatility
If multiple distance measuring sensors with different measurement methods are combined, then measurement range and accuracy are improved, but cost increases
Solution Approach 1:
The sensor implements universality by integrating multiple measurement functions into a single device. Through mode switching between direct and indirect ToF methods, the sensor adapts to different measurement ranges and accuracy requirements, providing versatile performance without the cost of multiple specialized sensors.
Solution Approach 2:
The patent applies dynamics through mode switching capability that allows the sensor to adaptively change its measurement method based on the specific application requirements. The sensor can dynamically select between direct and indirect ToF modes to optimize performance for different distance ranges, providing flexibility without increasing hardware complexity.
3Device complexity
If a single sensor performs both direct and indirect ToF measurements, then component count is reduced, but measurement accuracy may be compromised
Solution Approach 1:
The patent resolves this contradiction by implementing dynamic mode switching that selects the appropriate measurement method based on distance requirements. For close-range measurements, indirect ToF provides high accuracy, while for far-range measurements, direct ToF is used. This dynamic adaptation maintains measurement precision across different ranges while using a single sensor component.
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 enables efficient and accurate distance measurements across a wide range by integrating direct and indirect time-of-flight methods within a single sensor, reducing component count and power consumption while maintaining high measurement accuracy.
Implementation Method 1
a single photon avalanche diode (SPAD) pixel including a SPAD as a photoelectric conversion element
Implementation Method 2
In the SPAD, avalanche amplification occurs when one photon enters a PN junction region of a high electric field in a state where a voltage larger than the breakdown voltage is applied
Implementation Method 3
a time-of-flight (ToF) data processing unit that generates and outputs distance measurement data by a ToF method on the basis of a pixel signal
Data Source
AI summary
The present technology relates to a distance measuring sensor and a distance measuring system capable of performing different measurements using SPAD pixels. The distance measuring sensor includes a single photon avalanche diode (SPAD) pixel including a SPAD as a photoelectric conversion element, a time-of-flight (ToF) data processing unit that generates and outputs distance measurement data by a ToF method on the basis of a pixel signal output from the SPAD pixel, and a viewing data processing unit that generates and outputs viewing data on the basis of a pixel signal output from the SPAD pixel. The present technology can be applied to, for example, a distance measuring system that measures a distance to a subject, and the like.