Micromirror Array Pillars for Uniform Gap Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microelectromechanical systems, such as micromirror arrays, face performance degradation due to substrate deformation during fabrication and operation, leading to non-uniform gaps between substrates, which affects the electrostatic field strength and device performance, and are further compromised by contamination and viscosity issues.
Innovation Solution
The implementation of a microelectromechanical device with a plurality of pillars between substrates to maintain a uniform gap, combined with hermetic sealing and strategic pillar distribution to enhance mechanical robustness and performance, and the use of pillars connected to posts and hinges to ensure consistent rotation of micromirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If substrates are used to support micromirrors and electrodes, then device functionality is enabled, but substrate deformation occurs during fabrication and operation causing non-uniform gaps and performance degradation
Solution Approach 1:
The patent introduces pillars at specific locations between substrates to maintain uniform gap only in critical regions where micromirrors operate, rather than requiring complete substrate uniformity. The pillars provide localized structural support to counteract substrate deformation in the gap region, allowing the rest of the substrate to maintain its functional properties.
Solution Approach 2:
The patent uses pillars as intermediary elements between the first and second substrates. These pillars act as mediators that maintain the required gap distance despite substrate deformation, transferring mechanical support function from the substrates themselves to the pillar structures.
2Object-affected harmful factors
If hermetic packaging is implemented to prevent contamination, then device protection is improved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The patent combines the hermetic sealing function with the existing substrate and pillar structure. The sealing layer is integrated onto the second substrate, merging the protection function with the structural components rather than adding a separate complex packaging system.
3Manufacturing precision
If uniform gap between substrates is maintained, then electrostatic field strength is optimized, but manufacturing precision requirements increase due to substrate deformation
Solution Approach 1:
The patent incorporates pillars during the substrate assembly process before final device operation. The pillars are pre-positioned to establish the correct gap distance, preventing gap non-uniformity from developing during subsequent handling or operation, rather than requiring post-fabrication adjustment.
4Adaptability or versatility
If multiple substrates are used for micromirror and electrode support, then device functionality is enhanced, but gap non-uniformity increases due to differential deformation
Solution Approach 1:
The patent applies pillars selectively in regions where gap uniformity is critical for micromirror operation, rather than requiring uniform support across the entire multi-substrate structure. This allows different substrate regions to have different mechanical properties while maintaining functional performance.
Solution Approach 2:
The pillars serve as intermediary elements between the first substrate (carrying micromirrors) and second substrate (carrying electrodes), mediating the mechanical interaction and maintaining consistent spacing despite differential thermal or mechanical expansion of the two substrates.
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 solution maintains a consistent gap between substrates, enhances mechanical robustness, improves performance by reducing viscosity resistance, and provides a hermetic seal to protect against contamination, thereby ensuring reliable operation of the micromirror array device.
Implementation Method 1
a plurality of pillars disposed between the second substrate and the MEMS elements
Implementation Method 2
an electrostatic field is established between each mirror plate and the electrode associated with the mirror plate
Implementation Method 3
hermetic sealing and strategic pillar distribution to enhance mechanical robustness
Data Source
AI summary
The present invention provides a microstructure device comprising multiple substrates with the components of the device formed on the substrates. In order to maintain uniformity of the gap between the substrates, a plurality of pillars is provided and distributed in the gap so as to prevent decrease of the gap size. The increase of the gap size can be prevented by bonding the pillars to the components of the microstructure. Alternatively, the increase of the gap size can be prevented by maintaining the pressure inside the gap below the pressure under which the microstructure will be in operation. Electrical contact of the substrates on which the micromirrors and electrodes are formed can be made through many ways, such as electrical contact areas, electrical contact pads and electrical contact springs.