Scanning Mirror Display Light Sampling for Failure Detection
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Solution Overview
Problem
Scanning mirror display systems face issues with failure detection and potential health hazards due to high-intensity light spots, and existing sensor systems may provide inaccurate information, posing risks to viewers.
Innovation Solution
A method and system that includes a light sampling system and a controller to sample and analyze the light output, allowing for direct measurement of the light spot's position and movement, enabling reliable failure detection and performance adjustment of the scanning mirror.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are used to detect scanning mirror position, then failure detection capability is improved, but measurement precision deteriorates due to inaccurate sensor information
Solution Approach 1:
The patent introduces a light sampling system as an intermediary between the scanning mirror and the detection system. Instead of directly sensing the mirror position, the system samples the reflected light spot position on the display plane, which provides more accurate failure detection without relying on potentially inaccurate mirror-mounted sensors
Solution Approach 2:
The invention creates an optical copy of the light spot position by sampling a portion of the reflected light and directing it to a sensor. This copy allows accurate position measurement without requiring direct measurement of the mirror position, thereby improving detection reliability while avoiding sensor inaccuracies
2Reliability
If scanning mirror fails, then system reliability deteriorates creating health hazards, but adding complex sensor systems increases device complexity
Solution Approach 1:
The light sampling system serves multiple functions: it monitors the light spot position for failure detection, verifies proper scanning mirror operation, and provides safety monitoring. This multi-functionality improves system reliability without requiring separate complex sensor systems, thereby avoiding increased device complexity
Solution Approach 2:
The system continuously samples the light spot position and provides feedback to the controller. This feedback mechanism enables real-time failure detection and allows the controller to take corrective actions, improving system safety while using a relatively simple sampling system rather than complex active control sensors
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 ensures certain detection of scanning mirror failure, minimizes hardware requirements and costs, and allows for performance adjustments, thereby reducing health hazards and improving system reliability.
Implementation Method 1
a light sensor in a second light path created by the optical element... converting the sampled scanned light into electrical information
Data Source
AI summary
Scanning mirror based display system and method. A method comprises sampling a scanned light provided by a scanning mirror, converting the sampled scanned light into an electrical signal, analyzing the electrical signal to determine a position of the scanned light, and controlling the light source or the scanning mirror based on the analyzed electrical signal. The electrical signal based on the sampled scanned light may be used to ensure proper operation of the scanning mirror display system, such as determining failure of the scanning mirror, proper rendering of colors, determining whether the scanned light is following a desired scan path at a desired scan rate, and so forth.