MEMS Mirror Harmonic Suppression via Modified Square Wave Drive
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Solution Overview
Problem
Microelectromechanical system (MEMS) mirror-based head-worn and heads-up displays face challenges in suppressing undesired harmonics, which affect image quality and power consumption due to conventional tradeoffs between design considerations like bulk, form-factor, and image quality.
Innovation Solution
A controller generates a modified square wave voltage waveform with tri-state and/or attenuated portions to actuate the MEMS mirror system, reducing harmonic resonances by suppressing specific harmonics in the drive signal, thereby improving image quality while maintaining efficient power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drive signals are used to actuate the MEMS mirror system, then the mirror can be actuated, but undesired harmonic resonances occur that degrade image quality and increase power consumption
Solution Approach 1:
The patent applies parameter changes by modifying the drive signal waveform parameters (transition times, duty cycle, amplitude) to suppress harmonic resonances. The controller adjusts the square wave parameters to match the MEMS mirror's resonant characteristics, thereby reducing unwanted harmonics while maintaining effective mirror actuation.
Solution Approach 2:
The patent uses periodic action by implementing a modified square wave drive signal with specific duty cycles and periodic transition patterns. The drive signal is periodically adjusted to excite the MEMS mirror at desired frequencies while avoiding resonant frequencies that produce harmful harmonics.
2Use of energy by stationary object
If the MEMS mirror system is actuated with standard drive signals, then operation is simple, but power consumption increases due to harmonic content
Solution Approach 1:
The controller modifies drive signal parameters including transition times, duty cycle, and amplitude to reduce harmonic content. By optimizing these parameters, the system achieves lower power consumption while maintaining simple operational control through automated parameter adjustment.
Solution Approach 2:
The system employs feedback by monitoring the MEMS mirror response and adjusting drive signal parameters accordingly. The controller uses feedback information to optimize the square wave parameters, reducing harmonic resonances and power consumption while maintaining ease of operation through closed-loop control.
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 solution effectively suppresses harmonics in the MEMS mirror system, enhancing image quality and reducing power consumption, allowing for more efficient operation in head-worn and heads-up display applications.
Implementation Method 1
A controller may be provided to generate a drive signal to actuate a microelectromechanical (MEMS) mirror system
Implementation Method 2
suppress a number of harmonics of a response of the MEMS mirror system to the actuation based on the drive signal
Data Source
AI summary
Disclosed herein are devices and methods to generate a drive signal to actuate a MEMS mirror system. A controller can generate the drive signal to comprise a modified square wave voltage waveform comprising a tri-stated portion, an attenuated portion, or a tri-stated and an attenuated portion to suppress a number of harmonics in a response of the MEMS mirror system to the drive signal.