Planarized Reflective Layer for Micromirror Devices
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Solution Overview
Problem
Conventional methods for manufacturing planarised reflective layers for micromirror devices are complex and costly, involving multiple deposition and etching steps, which lead to increased optical loss due to topography interference and interfacial stress.
Innovation Solution
Directly depositing a reflective layer on a hinge layer and using Chemical Mechanical Planarization/Polishing (CMP) to form a substantially planar reflective surface, eliminating the need for amorphous Silicon spacers and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an intermediary layer is deposited and planarised prior to depositing the reflective layer, then the reflective layer achieves a planar surface, but the manufacturing process becomes complex with multiple deposition and etching steps
Solution Approach 1:
The patent removes the intermediary amorphous silicon layer from the conventional manufacturing process. By directly depositing the reflective layer on the hinge layer and using CMP to planarize it, the process eliminates unnecessary intermediate steps while achieving the same planarity result.
Solution Approach 2:
The patent combines the reflective layer deposition and planarization steps by directly depositing the reflective material on the hinge layer and then applying CMP to achieve planarity, merging what were previously separate intermediary layer operations into a streamlined process.
2Manufacturing precision
If multiple deposition and etching steps are used to manufacture the reflective layer, then the reflective layer can be formed, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the costly intermediary amorphous silicon layer and its associated deposition and etching steps from the manufacturing process, directly depositing the reflective layer on the hinge layer to reduce material and processing costs.
Solution Approach 2:
The patent eliminates the need for expensive intermediary materials and complex multi-step processes, using a simpler, more cost-effective approach that deposits the reflective layer directly and planarizes it through CMP.
3Manufacturing precision
If multiple deposition and etching steps are used to manufacture the reflective layer, then the reflective layer can be formed, but optical loss increases due to topography interference
Solution Approach 1:
The patent performs planarization through CMP as a preliminary action before final reflective layer formation, ensuring that the surface is already planarized and free from topography interference that would cause optical loss.
Solution Approach 2:
The patent removes the intermediary layer that causes topography interference and optical loss, directly forming the reflective layer on a planarized surface to minimize energy loss.
4Manufacturing precision
If an intermediary layer is used prior to depositing the reflective layer, then the reflective layer can be formed, but interfacial stress on the reflective layer increases
Solution Approach 1:
The patent removes the intermediary amorphous silicon layer that introduces interfacial stress, directly depositing the reflective layer on the hinge layer to eliminate the stress-generating interface.
Solution Approach 2:
The patent uses the hinge layer itself as the direct substrate for the reflective layer, eliminating the need for an intermediary layer and thereby removing the source of interfacial stress.
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 approach reduces manufacturing costs, improves yield, and minimizes interfacial stress on the reflective layer, resulting in a more efficient and cost-effective method for producing planarised reflective layers for micromirror devices.
Implementation Method 1
depositing a reflective layer of a reflective material over the second layer
Implementation Method 2
planarising the reflective layer to form a substantially planar reflective surface. The step of planarising the reflective layer to form a substantially planar reflective surface comprises performing Chemical Mechanical Planarising/Polishing (CMP) on the reflective layer
Data Source
AI summary
A method for manufacturing a planarized reflective layer disposed on a hinge layer connected to a hinge support post (210) is disclosed. The method comprises depositing a first layer of a first material to form the hinge layer (206), patterning a first mask over the first layer and selectively removing the first material not covered by any of the first mask to form a plurality of recesses, depositing a second layer of a second material over the first layer, patterning a second mask over the second layer and selectively removing the second material not covered by any of the second mask to form a hinge component (212), depositing a reflective layer (202) of a reflective material over the second layer and planarizing the reflective layer (202) to form a substantially planar reflective surface.