Smart Pulsing Infrared 3D Sensing for Gesture Detection
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Solution Overview
Problem
Interactive scanned beam display systems face challenges in achieving increased resolution and accuracy while minimizing power consumption and opto-mechanical complexity, as higher power output and receive gain lead to increased power consumption and complexity.
Innovation Solution
The implementation of smart pulsing in scanned beam 3D sensing systems, which adjusts the density of infrared pulses based on operational modes to balance spatial resolution and power consumption, allowing for reduced power usage during lower resolution needs and increased power for higher resolution requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power output and receive gain are increased to achieve increased resolution and accuracy, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of pulse density based on operational modes. The system transitions between different pulse density levels (first density for lower resolution, second density for higher resolution) depending on the operational requirements, allowing the system to optimize the balance between measurement precision and power consumption in real-time
Solution Approach 2:
The system changes the parameter of pulse density to control the trade-off between resolution and power consumption. By adjusting the density of infrared pulses emitted during scanning, the system can achieve higher measurement precision when needed while reducing power consumption during normal operation
2Measurement precision
If power output and receive gain are increased to achieve increased resolution and accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system dynamically switches between different operational modes with different pulse densities, avoiding the need for permanently complex hardware configurations. The controller adjusts pulse density based on operational needs, effectively managing complexity through software control rather than fixed hardware design
Solution Approach 2:
By changing the operational parameter of pulse density rather than permanently increasing hardware capability, the system achieves variable measurement precision without permanently increasing device complexity. The same hardware can operate at different performance levels based on requirements
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 approach enables efficient data acquisition with adjustable resolution and power usage, optimizing performance and reducing complexity by dynamically changing pulse density in response to detected objects and events, such as gestures and touch events.
Implementation Method 1
A time of flight (TOF) detection circuit measures a time of flight (TOF) of the infrared pulses
Implementation Method 2
An infrared (IR) light source emits infrared (IR) light pulses into a field of view
Data Source
AI summary
A scanning display system includes smart infrared pulsing to detect gestures and touch events with reduced power consumption. Infrared laser light pulses are emitted at a first density in a field of view and reflections are detected. Times of flight of the infrared laser light pulses are measured to determine if an object is in the field of view. The density of the infrared pulses may be increased based on various factors to detect gestures and touch events. Power consumption is reduced by reducing the density of laser pulses when possible.