Avalanche Photodiode Pixel Selection for High-Frame-Rate LiDAR
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Solution Overview
Problem
Existing LiDAR systems face challenges in achieving high resolution and high frame rate for distance measurement using two-dimensional silicon photomultiplier sensors, particularly in scanning methods that require efficient detection and processing of reflected laser light.
Innovation Solution
The implementation of a light detector with a pixel array comprising avalanche photodiodes, selection circuits, and an output circuit that applies operating voltage to selected pixels, enabling efficient detection and processing of reflected light signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-dimensional silicon photomultiplier sensor is used for LiDAR distance measurement, then the potential for high resolution and high frame rate is improved, but the complexity of detecting and processing reflected light signals increases
Solution Approach 1:
The sensor is divided into multiple independently controllable pixel units arranged in a two-dimensional array. Each pixel can be selectively activated and controlled, allowing the system to process reflected light signals from different spatial positions independently. This segmentation enables high-resolution distance measurement while managing detection complexity through modular pixel-level control.
2Productivity
If high frame rate distance measurement is implemented using scanning methods, then the productivity of the LiDAR system is improved, but the difficulty of detecting and measuring reflected light signals increases
Solution Approach 1:
The LiDAR system employs periodic scanning of laser beams across the field of view, with the two-dimensional pixel sensor capturing reflected light at regular time intervals. This periodic scanning approach enables high frame rate operation by systematically cycling through different spatial positions, while the structured temporal pattern simplifies the detection and processing of reflected light signals compared to continuous random scanning.
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
Enhances the resolution and frame rate of LiDAR systems by optimizing the detection and processing of laser light reflections, allowing for more precise distance measurements.
Implementation Method 1
a pixel array including a plurality of pixels PX, each having an avalanche photodiode APD
Data Source
AI summary
A light detector according to one embodiment includes pixels, selection circuits, and an output circuit. The pixels each includes an avalanche photodiode. The selection circuits are respectively coupled to the pixels. The selection circuits are configured to output a signal output from a pixel selected from the pixels to a first node. The output circuit is coupled to the first node. The output circuit is configured to apply a first operating voltage to the avalanche photodiode included in the selected pixel via a selection circuit of the selection circuits that is coupled to the selected pixel, output an current based on the signal output from the selected pixel to a second node, and change the first operating voltage.