Light Diffusing Sheet Using PDMS and Poly-chloro-p-xylene
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Solution Overview
Problem
Current methods for manufacturing fine patterns, such as photolithography and nanoimprinting, are costly and time-consuming, and require expensive equipment, making it difficult to produce patterns in varying sizes and shapes efficiently.
Innovation Solution
A light diffusing sheet is created using a polydimethylsiloxane (PDMS) coating layer with a poly-chloro-p-xylene coating layer, where the tensile strength of the PDMS layer is between 10 to 60 psi, allowing for pattern formation without the need for molding, lithography, UV irradiation, or heat treatment, and enabling application to flexible devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography or nanoimprinting processes are used to manufacture fine patterns, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses a polymer mold that can be duplicated from a silicone mold to create patterns. This copying approach allows the transfer of patterns without requiring expensive photolithography equipment, thereby reducing device complexity while maintaining manufacturing precision for fine patterns.
Solution Approach 2:
The patent replaces the mechanical/optical photolithography system with a polymer-based imprinting system. By using a polymer mold that can be manually or mechanically operated, the complex photolithography equipment is substituted with simpler polymer processing equipment, reducing overall device complexity.
2Manufacturing precision
If photolithography or nanoimprinting processes are used to manufacture fine patterns, then manufacturing precision is improved, but manufacturing time increases
Solution Approach 1:
The patent employs a polymer mold copying method where a silicone mold is duplicated into a polymer mold. This copying process can be rapidly performed without the lengthy exposure and development steps required in photolithography, significantly reducing manufacturing time while maintaining the precision needed for fine patterns.
Solution Approach 2:
The patent changes the material parameters from rigid photolithography resins to flexible polymers like PDMS and poly-chloro-p-xylene. These polymer materials can be processed at lower temperatures and shorter times, reducing manufacturing time while achieving the required pattern precision through controlled polymer properties rather than complex processing steps.
3Ease of manufacture
If conventional polymer molding methods are used, then ease of manufacture is improved, but adaptability for varying pattern types decreases
Solution Approach 1:
The patent uses a polymer mold system that can be dynamically adjusted. The polymer mold can be manually manipulated and reconfigured to create different pattern types by changing the mold geometry or configuration, providing adaptability for varying pattern requirements while maintaining the simplicity of polymer processing.
Solution Approach 2:
The patent employs polymer materials with adjustable properties such as tensile strength (10 to 60 psi for PDMS layer) and elasticity. By changing these material parameters, the same basic polymer molding process can accommodate different pattern types and requirements, achieving both ease of manufacture and adaptability.
4Strength
If rigid materials are used for the coating layer, then strength is improved, but adaptability for flexible devices decreases
Solution Approach 1:
The patent specifically controls the tensile strength parameter of the PDMS coating layer to be between 10 to 60 psi. This parameter optimization allows the coating to be strong enough to maintain structural integrity while remaining flexible and adaptable to flexible devices, resolving the contradiction between strength and flexibility.
Solution Approach 2:
The patent uses a composite structure combining PDMS (tensile strength 10 to 60 psi) with poly-chloro-p-xylene coating layer. This composite material approach allows the PDMS layer to provide flexibility and adaptability while the poly-chloro-p-xylene layer provides additional functional properties, achieving both strength and flexible device compatibility.
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 method reduces manufacturing time and cost, allows for flexible device applications, and enables efficient light diffusion regardless of the light source, while being applicable at normal temperatures, thus overcoming the limitations of existing technologies.
Implementation Method 1
a poly-chloro-p-xylene coating layer that is formed on one side of the polydimethylsiloxane (PDMS) coating layer with a pattern formed on its surface
Data Source
AI summary
A light diffusing sheet according to an embodiment of the invention may be a light diffusing sheet that is formed on one side of a substrate and has a particular pattern formed on a surface thereof, where the light diffusing sheet may include a polydimethylsiloxane (PDMS) coating layer that is formed on one side of the substrate and a poly-chloro-p-xylene coating layer that is formed on one side of the polydimethylsiloxane (PDMS) coating layer with a pattern formed on its surface, the tensile strength of the polydimethylsiloxane (PDMS) coating layer is 10 to 60 psi, and a compressive force is applied on the polydimethylsiloxane (PDMS) coating layer when an interface is formed between the polydimethylsiloxane (PDMS) coating layer and the poly-chloro-p-xylene coating layer.