3D Sensing Timing Coordination to Prevent Light Interference
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Solution Overview
Problem
3D sensing systems face issues with overlapping light sources causing interference and resulting in low confidence and decoded rates due to error reflection sensing signals.
Innovation Solution
A 3D sensing system with multiple sensing devices and a controller that adjusts sensing timings based on interference results to prevent overlap and interference, enhancing decoded rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensing devices are used for 3D sensing, then the sensing coverage and capability are improved, but light source overlap and interference occur causing low decoded rate
Solution Approach 1:
The patent implements periodic time-division multiplexing where each sensing device operates in dedicated time slots. The controller coordinates multiple sensing devices to emit light and sense reflections in alternating periodic intervals, ensuring that only one device is active during each sensing window. This periodic scheduling eliminates light source overlap while maintaining comprehensive sensing coverage across all devices.
2Productivity
If multiple sensing devices operate simultaneously, then the sensing efficiency is improved, but interference from other modules causes error signals
Solution Approach 1:
The patent segments the sensing process into distinct time slots for each sensing device. Instead of simultaneous operation, each device is allocated a specific time window to emit light and sense reflections. This temporal segmentation separates the operations of multiple devices, eliminating mutual interference while preserving the combined sensing capability of all devices.
Solution Approach 2:
The controller acts as an intermediary that coordinates the operation of multiple sensing devices. It manages the timing and sequencing of each device's emission and sensing cycles, ensuring that devices operate in a non-conflicting manner. The controller mediates between the need for multiple devices and the need to avoid interference by orchestrating their operation in time-division multiplexed fashion.
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 system achieves high decoded rates by minimizing interference through timing adjustments, ensuring accurate 3D sensing outcomes.
Implementation Method 1
The ToF ranging technology calculates a time difference or a phase difference between a projection light and the reflection sensing signal from the object and calculates the distance and geometry to the object according to the time difference or the phase difference.
Data Source
AI summary
A 3D sensing system is provided. The 3D sensing system includes a first sensing device, a second sensing device and a controller. The first sensing device provides at least one first emitting light and receives a first sensing signal based on a first sensing timing. The second sensing device provides at least one second emitting light and receives a second sensing signal based on a second sensing timing. The controller adjusts at least one of the first sensing timing and the second sensing timing according to an interference result of the second sensing signal by the first sensing device.