Structured Light Eye Safety Control via Sensor Fusion
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Solution Overview
Problem
Existing structured light modules in electronic devices, such as smartphones, face challenges in safely projecting 3D images without harming human eyes, especially when the zero-level region is activated, as they require additional distance sensors to prevent eye damage, increasing costs and occupying valuable space.
Innovation Solution
The implementation of an infrared emitter, infrared sensor, and visible light sensor in electronic devices, which acquire the original pixel position of the zero-level region and human eye pixel position to determine if the eye enters the hazardous zone, triggering a protection mechanism to adjust the infrared emitter's mode and prevent eye harm, allowing the structured light module to be placed at the front or back without needing a distance sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a distance sensor is added to prevent eye damage from the zero-level region, then eye safety is improved, but device complexity and cost increase
Solution Approach 1:
The infrared sensor and visible light sensor work together to autonomously detect whether a user's eye is in the zero-level region and trigger the protection mechanism, eliminating the need for external distance sensors. The system serves itself by using its existing sensors for dual purposes: depth sensing and eye safety monitoring.
Solution Approach 2:
The existing infrared sensor and visible light sensor are made multi-functional by using them not only for depth sensing but also for eye safety monitoring. The processor analyzes pixel position data from these sensors to determine eye presence in the zero-level region, making the same hardware serve multiple critical functions.
2Reliability
If a distance sensor is added to prevent eye damage, then eye safety is improved, but occupied space increases
Solution Approach 1:
The existing infrared sensor and visible light sensor are made multi-functional by using them not only for depth sensing but also for eye safety monitoring. The processor analyzes pixel position data from these sensors to determine eye presence in the zero-level region, making the same hardware serve multiple critical functions.
Solution Approach 2:
The infrared sensor and visible light sensor work together to autonomously detect whether a user's eye is in the zero-level region and trigger the protection mechanism, eliminating the need for external distance sensors. The system serves itself by using its existing sensors for dual purposes: depth sensing and eye safety monitoring.
3Manufacturing precision
If the infrared emitter projects high-intensity structured light for accurate 3D modeling, then modeling precision is improved, but eye safety risk increases
Solution Approach 1:
The system continuously monitors the zero-level region using the infrared sensor and visible light sensor, and the processor provides feedback by determining whether a user's eye is present in this region. When eye presence is detected, the system immediately adjusts the infrared emitter's output, creating a closed-loop control system that maintains modeling precision while ensuring eye safety.
Solution Approach 2:
The infrared emitter's output is made dynamic by adjusting its intensity or disabling it based on real-time eye presence detection. The system transitions between different operating states (normal high-intensity projection vs. protected low-intensity or disabled state) based on the detected conditions, allowing optimal modeling performance when safe and protection when needed.
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 solution reduces costs and space usage by eliminating the need for a distance sensor, while ensuring safe operation by adjusting the infrared emitter's mode when the eye enters the zero-level region, enabling accurate modeling of close objects without compromising user interaction.
Implementation Method 1
The structured light projector is used to project a laser pattern into a target space
Implementation Method 2
the structured light camera is used to collect the laser pattern to obtain depth information
Implementation Method 3
acquire a human eye pixel position of a human eye region on the visible light sensor
Data Source
AI summary
A control method for an electronic device and an electronic device are provided. The electronic device includes an infrared emitter, an infrared sensor, and a visible light sensor. The control method includes: acquiring an original pixel position of a zero-level region on the infrared sensor; acquiring a human eye pixel position of a human eye region on the visible light sensor; determining whether a human eye enters the zero-level region according to the original pixel position and the human eye pixel position; and triggering a protection mechanism of the infrared emitter when the human eye enters the zero-level region.