Flexible Electro-Optic Media Binder for Rupture Prevention
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Solution Overview
Problem
Flexible electro-optic displays with encapsulated media are prone to mechanical rupture under extreme stress, leading to visual defects due to the migration of internal phases and dissolution of adhesive layers, which compromises their mechanical robustness and image quality.
Innovation Solution
Incorporating a binder with an elastomer having a Young's modulus less than 25 MPa to create a more robust electro-optic medium that can withstand bending stresses, reducing the likelihood of capsule rupture and maintaining image quality by delocalizing stress and preventing adhesive layer dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If flexible substrates are used in electro-optic displays, then weight reduction and flexibility are achieved, but mechanical robustness deteriorates under extreme stress
Solution Approach 1:
The patent uses a composite binder system combining a rigid polymer (acrylonitrile butadiene styrene copolymer) with a flexible polymer (polyethylene glycol) to create a mechanically robust electro-optic medium that can withstand bending stresses while maintaining flexibility. This composite material approach resolves the contradiction between flexibility and mechanical strength by combining materials with complementary properties.
2Manufacturing precision
If encapsulated electro-optic media are used, then image quality is improved, but mechanical rupture risk increases under extreme stress
Solution Approach 1:
The patent incorporates a flexible polymer component (polyethylene glycol) into the binder system beforehand to provide cushioning and stress distribution capability. This pre-built mechanical buffer protects the encapsulated electro-optic media from rupture under extreme bending stresses, maintaining both image quality and capsule integrity simultaneously.
3Stability of the object's composition
If rigid binder materials are used, then structural stability is improved, but stress concentration increases leading to capsule rupture
Solution Approach 1:
The patent modifies the mechanical parameters of the binder by combining rigid and flexible polymer components, creating a material with intermediate mechanical properties. The flexible polymer component changes the stress distribution parameters, reducing stress concentration while maintaining structural stability through the rigid polymer framework.
4Ease of manufacture
If lamination adhesive layers are present, then display assembly is improved, but adhesive dissolution risk increases when capsules rupture
Solution Approach 1:
The patent employs a mechanically robust binder system with flexible polymer components that preemptively prevents capsule rupture under stress. By eliminating the rupture condition beforehand, the harmful effect of adhesive layer dissolution is prevented, while the display assembly process remains facilitated by the binder's adhesive properties.
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 use of a binder with a low Young's modulus elastomer enhances the mechanical robustness of flexible displays, preventing capsule rupture and maintaining image quality even under extreme bending conditions, thus reducing visual defects and improving long-term image stability.
Implementation Method 1
the binder comprises an elastomer having a Young's modulus less than 25 MPa
Data Source
AI summary
An electro-optic medium is disclosed including a continuous phase comprising a binder and a discontinuous phase comprising electro-optic material. The binder may include one or more elastomers having a Young's modulus less than 25 MPa. The electro-optic material may include capsules that encapsulate various kinds of materials capable of switching optical states, such as a plurality of charged particles dispersed in a suspending fluid and capable of moving upon application of an electric field to the suspending fluid. The electro-optic medium may be incorporated into a laminated flexible electro-optic display having an outer light-transmissive protective layer and conductive material on either side of the electro-optic medium. The conductive material on at least one side of the electro-optic medium may also be light-transmissive. The opposing side of the display relative to the outer protective layer may also include a substrate.