Flexible Polymer Module Substrates for Micro-Transfer Printing
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Solution Overview
Problem
There is a need for efficient, accurate, and precise methods to micro-assemble micro-components into modules and assemble these modules into systems, particularly for flexible and organic or polymer substrates, which face challenges in mechanical stress and substrate compatibility.
Innovation Solution
The use of flexible module substrates made from organic or polymer materials with a more brittle module tether, combined with an encapsulation layer and anti-stiction structures, allows for micro-transfer printing of components onto a target substrate, ensuring mechanical robustness and preventing stiction during printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid substrates are used for micro-component assembly, then manufacturing precision and component stability are improved, but flexibility and adaptability to different system substrates deteriorate
Solution Approach 1:
The patent employs flexible substrates including polyimide films and thin-film structures that can conform to curved surfaces and flexible system substrates while maintaining sufficient mechanical stability for micro-component assembly. The flexible substrate acts as a carrier that bridges the gap between rigid component requirements and flexible system integration.
Solution Approach 2:
The patent utilizes composite substrate structures combining multiple materials with different properties, such as polyimide layers combined with adhesive layers and protective coatings. This composite approach allows the substrate to simultaneously provide flexibility for system integration and sufficient rigidity for precise component placement and stability.
2Adaptability or versatility
If flexible substrates are used to improve adaptability, then substrate flexibility and system integration are improved, but mechanical robustness and component protection deteriorate
Solution Approach 1:
The flexible substrate is constructed as a composite structure with multiple functional layers including polyimide base layers, adhesive layers, and protective coatings. This composite design provides both flexibility for system integration and enhanced mechanical robustness through the combined properties of different materials.
Solution Approach 2:
The patent incorporates protective coatings and encapsulation layers on the flexible substrate and micro-components before system assembly. These protective layers serve as cushioning that prevents mechanical degradation and protects components during handling and operation on flexible substrates.
3Ease of manufacture
If micro-components are directly assembled on flexible substrates, then manufacturing simplicity is improved, but component reliability and protection from mechanical stress deteriorate
Solution Approach 1:
The patent divides the substrate structure into distinct functional segments including base substrate layers, adhesive layers, and protective encapsulation layers. This segmentation allows each layer to be optimized for its specific function while maintaining overall manufacturing simplicity through a modular assembly approach.
Solution Approach 2:
Protective encapsulation layers are applied to micro-components and substrate structures before final assembly to prevent mechanical degradation. This beforehand protection ensures component reliability while maintaining the simplicity of the assembly process.
4Manufacturing precision
If brittle tethers are used for component attachment, then manufacturing precision and component positioning are improved, but mechanical robustness and resistance to flexing deteriorate
Solution Approach 1:
The patent carefully controls the physical parameters of tether materials including thickness, width, and material composition to achieve optimal balance between brittleness for precise positioning and flexibility for mechanical robustness. By adjusting these parameters, the tethers can fracture at controlled locations during release while maintaining strength during assembly.
Solution Approach 2:
The tethers are constructed from composite materials or multi-layer structures that combine the brittleness needed for precise positioning and clean fracture during release with sufficient flexibility to withstand handling and assembly processes without premature failure.
Data Source
AI summary
A micro-component module comprises a module substrate, a component disposed on the module substrate, and at least a portion of a module tether in contact with the module substrate. The module substrate can be flexible or can comprise an organic material, or both. The module tether can be more brittle and less flexible than the module substrate. The component can be less flexible than the module substrate and can comprise at least a portion of a component tether. An encapsulation layer can be disposed over the component and module substrate. The component can be disposed in a mechanically neutral stress plane of the micro-component module. A micro-component module system can comprise a micro-component module disposed on a flexible system substrate, for example by micro-transfer printing. A micro-component module can comprise an internal module cavity in the module substrate with internal module tethers physically connecting the module substrate to internal anchors.