Micromirror Array Encapsulated Metal Reflective Layer
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Solution Overview
Problem
Existing micromirror devices face issues with oxidation of metal coatings, degradation of reflective surfaces, protection of micro-mechanical structures, and complex anti-reflective coating processes, which affect their optical quality and durability.
Innovation Solution
A micromirror array device with a substrate, electrode, actuation elements, a sub coating layer, a high reflective metal layer, and an over coating layer is developed, where the sub and over coating layers encapsulate the metal layer to prevent oxidation, galvanic corrosion, and environmental degradation, while also simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal layer is used for high reflectivity, then optical quality is improved, but oxidation and degradation occur over time
Solution Approach 1:
The patent applies composite materials by combining a metal layer (for reflectivity) with dielectric coating layers (for protection). The metal layer provides high reflectivity while the dielectric coatings form a protective composite structure that prevents oxidation and environmental degradation, resolving the contradiction between optical performance and reliability.
Solution Approach 2:
The patent uses thin film dielectric coatings to encapsulate and protect the metal layer. These thin films act as protective shells that prevent direct exposure of the metal to oxygen and environmental factors, maintaining both the reflectivity and oxidation resistance over time.
2Illumination intensity
If anti-reflective coatings are applied to enhance optical properties, then image quality is improved, but the fabrication process becomes complex and difficult
Solution Approach 1:
The patent merges the protective function and anti-reflective function into a single integrated coating structure. The dielectric layers serve dual purposes: protecting the metal layer from oxidation and providing anti-reflective properties for improved optical quality, thereby simplifying the fabrication process while achieving both goals.
Solution Approach 2:
The dielectric coating layers are designed to perform multiple functions simultaneously: they provide environmental protection, prevent oxidation, and offer anti-reflective properties. This multi-functionality reduces the need for separate coating processes and simplifies the overall fabrication complexity.
3Ease of manufacture
If the metal layer is exposed to the environment, then fabrication is simpler, but reflectivity degrades due to oxidation
Solution Approach 1:
The patent applies protective dielectric coatings during the fabrication process before the device is finalized. This preliminary protection ensures that the metal layer is already shielded from oxidation and environmental factors, maintaining reflectivity without complicating the fabrication process.
Solution Approach 2:
Thin film dielectric coatings are applied to encapsulate the metal layer, providing immediate protection against oxidation and environmental degradation. This approach maintains fabrication simplicity while ensuring long-term reflectivity maintenance.
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 protects the metal layer from oxidation and corrosion, maintains high reflectivity, and enhances the optical performance of the micromirror array device, reducing degradation and improving its durability and optical quality.
Implementation Method 1
the metal surface is degraded by oxidation. Since the metal layer was exposed to the environments, the reflectivity of the micromirror was slowly degraded by oxidation
Implementation Method 2
the micromirror array device has a reflectivity of metal. It has a good performance of light reflecting and modulating
Data Source
AI summary
The present invention provides an optical micromirror device and their array device and method for making the same. By introducing a sub coating layer and an over coating layer with a high reflective metal layer, the reflective layer of the micromirrors is protected from environmental circumstances, oxidation, degradation, acid, base, and galvanic corrosion of the micro-mechanical structures. Also the new coating structure enhances the performance of the micromirror array device by reducing degradation of the reflectivity of the metal layer, by providing anti-reflection in the optically non-effective area, and by protecting the micro-mechanical structures.