Scanning Mirror Resonant Frequency Tuning via Flexure Tension
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Solution Overview
Problem
Scanning display systems face challenges in synchronizing the resonant frequency of scanning mirrors with video data frame rates due to manufacturing variances and changes over time, leading to issues with frame display latency and the need for costly buffers or complex locking mechanisms, especially in low-latency applications like virtual reality head-mounted displays.
Innovation Solution
A scanning mirror system with an electromechanical actuator system that adjusts the resonant frequency by changing tension in supporting flexures or redistributing mass, allowing dynamic synchronization with video data frame rates without large buffers or frame locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resonant frequency of the scanning mirror is adjusted to synchronize with video data frame rates, then frame display synchronization is improved, but device complexity increases due to the need for electromechanical actuator systems
Solution Approach 1:
The patent applies parameter changes by adjusting the resonant frequency of the scanning mirror through an electromechanical actuator system. The actuator modifies physical parameters such as tension in supporting flexures or mass distribution to dynamically tune the resonant frequency, enabling synchronization with video frame rates while maintaining system reliability
Solution Approach 2:
The system implements feedback control by continuously monitoring the resonant frequency and adjusting the electromechanical actuator to maintain synchronization with video data frame rates. This closed-loop approach ensures reliable frame display synchronization despite manufacturing variances or environmental changes
2Measurement precision
If manufacturing precision is increased to reduce resonant frequency variances, then synchronization accuracy is improved, but manufacturing cost and complexity increase
Solution Approach 1:
Instead of relying on static manufacturing precision, the patent employs dynamic adjustment through the electromechanical actuator system. The resonant frequency can be tuned in real-time to compensate for manufacturing variances, shifting the requirement from static fabrication tolerance to dynamic controllability
Solution Approach 2:
The system changes physical parameters such as flexure tension or mass distribution to adjust resonant frequency, allowing post-manufacturing tuning that compensates for fabrication tolerances without requiring ultra-precise manufacturing
3Adaptability or versatility
If tension in supporting flexures is adjusted to change resonant frequency, then frequency tuning is achieved, but mechanical stress on components increases
Solution Approach 1:
The patent utilizes parameter changes by adjusting the tension in supporting flexures through the electromechanical actuator system. This modifies the resonant frequency of the scanning mirror, enabling frequency tuning while monitoring stress levels to prevent component damage
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
Enables proper frame display by dynamically adapting to resonant frequency variances, ensuring harmonically oscillating scanning mirrors align with video data frame rates, reducing latency and complexity in display systems.
Implementation Method 1
adjusting the resonant frequency by changing tension in supporting flexures
Implementation Method 2
scanning mirror configured to scan light from the light source in at least one direction at a resonant frequency of the scanning mirror
Implementation Method 3
ensuring harmonically oscillating scanning mirrors align with video data frame rates
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
Examples are disclosed that relate to scanning display systems. One example provides a display device comprising a controller, a light source, and a scanning mirror system. The scanning mirror system comprises a scanning mirror configured to scan light from the light source in at least one direction at a resonant frequency of the scanning mirror, and an electromechanical actuator system coupled with the scanning mirror and being controllable by the controller to adjust the resonant frequency of the scanning mirror.