Adaptive Notch Filter Tracks MEMS Mirror Resonance
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Solution Overview
Problem
Resonance in slow scan MEMS mirrors negatively impacts linearity and efficiency in display devices, leading to suboptimal image quality and reliability due to unpredictable changes in environmental conditions.
Innovation Solution
An adaptive notch filter system that adjusts its notch frequency to track the resonant frequencies of the slow scan MEMS mirror, maintaining a constant frequency response and suppressing resonant frequencies, thereby stabilizing the movement and improving image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the slow scan MEMS mirror operates at resonant frequency, then efficiency is improved, but linearity deteriorates
Solution Approach 1:
The patent applies this principle by using the resonant frequency characteristics of the slow scan MEMS mirror (which normally cause linearity problems) as the target for adaptive notch filtering. The system identifies the resonant frequency and applies targeted suppression, converting the harmful resonance effect into a controlled parameter that can be precisely managed, thereby maintaining efficiency while improving linearity.
Solution Approach 2:
The patent implements this principle through adaptive notch filtering that dynamically adjusts the suppression frequency parameter to track the resonant frequency of the slow scan MEMS mirror. By continuously monitoring and adjusting the filter parameters based on the mirror's actual resonant frequency (which may drift due to environmental conditions), the system maintains optimal linearity while preserving operational efficiency.
2Adaptability or versatility
If environmental conditions change, then resonant frequency drifts, but fixed notch filter cannot adapt, leading to deterioration in frequency response stability
Solution Approach 1:
The patent applies this principle by implementing an adaptive notch filter that dynamically adjusts its suppression frequency to track the resonant frequency of the slow scan MEMS mirror. Unlike a fixed notch filter, the adaptive filter continuously monitors the mirror's resonant frequency (which drifts with environmental conditions) and adjusts its parameters accordingly, maintaining effective resonance suppression and frequency response stability under varying conditions.
Solution Approach 2:
The patent implements this principle through a feedback mechanism that monitors the frequency response of the slow scan MEMS mirror and uses this information to adjust the notch filter parameters. The system measures the actual resonant frequency and feeds this information back to the adaptive filter, enabling it to automatically track and suppress the resonant frequency, thereby maintaining frequency response stability despite environmental variations.
3Manufacturing precision
If resonance is present in slow scan MEMS mirror, then image quality deteriorates, but suppressing resonance reduces operational efficiency
Solution Approach 1:
The patent applies this principle by precisely targeting the resonant frequency for suppression using adaptive notch filtering. Instead of broad-spectrum damping that would reduce efficiency, the system identifies the exact resonant frequency and applies targeted suppression only at that frequency. This converts the harmful resonance effect into a precisely controlled parameter, maintaining operational efficiency while improving image quality by eliminating the specific resonant distortions.
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
The adaptive notch filter system enhances the reliability and accuracy of the slow scan MEMS mirror by maintaining a constant frequency response, stabilizing movement, and improving image clarity across a wide bandwidth, even with changes in environmental conditions.
Implementation Method 1
A resonant frequency of a slow scan MEMS mirror is a frequency at which the slow scan MEMS mirror resonates. The adaptive notch filter is configured to modify a magnitude of a frequency response of a combination of the adaptive notch filter and the slow scan MEMS mirror to be substantially constant by suppressing the at least one notch frequency in a frequency response of the slow scan MEMS mirror.
Data Source
AI summary
Techniques are described herein that are capable of adjusting a notch frequency of an adaptive notch filter (“filter”) to track a resonant frequency of a slow scan MEMS mirror (“mirror”). For instance, an adaptive feedback may be configured to determine one or more resonant frequencies of the mirror based at least in part on a frequency response of an output signal that is proportional to movement of the mirror. The adaptive feedback may be further configured to adjust at least one notch frequency of the filter to track at least one respective resonant frequency of the mirror. The filter may be configured to modify a magnitude of a frequency response of a combination of the filter and the mirror to be substantially constant by suppressing the at least one notch frequency in a frequency response of the mirror.