Deformable Hinge Micromirror Using Conductive Polymer
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Solution Overview
Problem
Micromirror devices face limitations in size reduction and low-voltage operation due to the need for thick conductive layers and large hinge posts, which also introduce mechanical and electrical connection challenges, and oxide coatings on hinge posts can generate defects during fabrication.
Innovation Solution
A micromirror device design where a deformable hinge is formed on a substrate with a hinge post surrounded by a dielectric material, allowing for improved mechanical and electrical integrity while enabling scaling, using a method that involves depositing a spacer layer, patterning, and filling the via region with a hinge post material, followed by forming a reflective mirror plate and removing sacrificial layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick conductive layers and large hinge posts are used to improve electrical connection quality, then electrical connection reliability is improved, but device size increases
Solution Approach 1:
The patent changes the material parameter from conventional conductive materials to conductive polymer material, which provides high electrical conductivity with much thinner layer thickness. This allows achieving the same electrical connection quality with significantly reduced dimensions, resolving the contradiction between connection reliability and device size.
Solution Approach 2:
The patent uses composite material structure combining conductive polymer material with the hinge post, creating a material that simultaneously provides mechanical support and excellent electrical conductivity. This composite approach enables thin-profile design while maintaining reliable electrical connection.
2Reliability
If thick conductive layers and large hinge posts are used to improve electrical connection quality, then electrical connection reliability is improved, but operating voltage requirement increases
Solution Approach 1:
The conductive polymer material has superior electrical conductivity compared to conventional materials, which directly reduces the voltage required for operation. By changing the material parameter, the patent enables low-voltage operation while maintaining excellent electrical connection quality.
3Strength
If oxide coatings are applied to hinge posts for mechanical enhancement, then mechanical strength is improved, but fabrication defects increase
Solution Approach 1:
The patent replaces the oxide coating process with a conductive polymer material deposition that does not require complex thermal oxidation processes. The conductive polymer material inherently provides both mechanical enhancement and electrical conductivity without generating fabrication defects, eliminating the harmful side effects of oxide coating.
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 configuration enhances the mechanical and electrical properties of the micromirror device, allowing for smaller size and low-voltage operation while minimizing defects, thus improving the scalability and performance of the micromirror device.
Implementation Method 1
an electrostatic field can be established between the electrode and the mirror plate. Such electrostatic field yields an electrostatic torque to the mirror plate; and thus moves the mirror plate with the electrostatic torque.
Data Source
AI summary
A reflective and deformable micromirror device comprises a reflective micromirror plate attached to a deformable hinge that is formed on and held by a hinge post on a substrate. The substrate has an addressing electrode formed thereon. A selected dielectric material is disposed between the deformable hinge and the addressing electrode.