Laser Projector Eye Safety Control via Distance Detection
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Solution Overview
Problem
Existing laser projectors in mobile devices lack effective control mechanisms to ensure safe operation, particularly in scenarios where the distance between the human eye and the projector is close, potentially causing eye harm due to continuous high-intensity laser emission.
Innovation Solution
A control system for a laser projector that includes a first driving circuit, a microprocessor, and an application processor, which detects the distance between the human eye and the projector using a distance sensor and adjusts the laser projection parameters (current, frame rate, and pulse width) to prevent eye harm by reducing emission intensity when the distance is short.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the laser projector continuously emits high-intensity laser, then the projection efficiency and energy consumption are improved, but the eye safety is compromised when the distance between human eye and projector is close
Solution Approach 1:
The patent implements dynamic adjustment of laser projection parameters (current, frame rate, pulse width) based on real-time distance detection. When the distance between the laser projector and human eye is detected to be within a safety threshold, the system automatically reduces emission intensity by adjusting these parameters, thereby maintaining eye safety while optimizing projection efficiency at different operating conditions
Solution Approach 2:
The system employs a distance sensor to continuously monitor the distance between the laser projector and human eye, creating a feedback loop. Based on this feedback information, the control system dynamically adjusts laser emission parameters to prevent eye harm while maintaining efficient operation, resolving the contradiction between continuous high-intensity emission and eye safety
2Object-affected harmful factors
If the laser projector adjusts emission intensity based on distance, then the eye safety is improved, but the system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent integrates multiple functions into existing system components. The distance sensor serves both proximity detection and eye safety monitoring purposes. The control system adjusts laser parameters through existing communication interfaces, making the safety mechanism part of the overall system architecture rather than a separate add-on, thereby minimizing additional complexity
Solution Approach 2:
The control system merges the eye safety function with the existing laser projection control architecture. By integrating distance-based parameter adjustment into the existing control flow and using shared hardware resources (processor, communication interfaces), the system achieves eye safety protection without proportionally increasing overall system complexity
Data Source
AI summary
A control system (30) for a laser projector (10), a terminal (100) and a control method for the laser projector (10) are provided. The control system (30) includes a first driving circuit (31), a microprocessor (35) and an application processor (33). The first driving circuit (31) is connected with the laser projector (10). The first driving circuit (31) is configured to drive the laser projector (10) to project laser. The microprocessor (35) is connected with the first driving circuit (31). The application processor (33) is connected with the microprocessor (35). The application processor (33) is configured to send a control signal to the microprocessor (35) according to a distance between a human eye and the laser projector (10). The microprocessor (35) controls the first driving circuit (31) according to the control signal to enable the laser projector (10) to project laser according to a predetermined parameter.