Inkjet-Printable Adhesive Composition for Foldable Displays
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Solution Overview
Problem
The production of foldable displays is hindered by the need for precise cutting of optically clear adhesives (OCAs) to fit films accurately, leading to increased production costs and complexity.
Innovation Solution
A composition comprising a first monomer with a hydroxy group, a second monomer without a hydroxy group, a third monomer with a terminal heterocyclic group, a fourth monomer with an alkylene glycol group, an oligomer, a silane coupling agent, and a photoinitiator, which can be inkjet-printed at room temperature, forming a polymer with suitable modulus values for adhesion and flexibility, eliminating the need for precise cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optically clear adhesive is precisely cut to fit films accurately, then adhesion performance is improved, but production cost increases
Solution Approach 1:
The patent replaces the mechanical cutting system with an inkjet printing system that applies adhesive in liquid form directly to the film. This substitution eliminates the need for precise mechanical cutting while maintaining adhesion performance, as the liquid adhesive can be precisely deposited and conforms to the film surface.
Solution Approach 2:
The patent changes the physical state of the adhesive from solid (requiring cutting) to liquid (suitable for inkjet printing). The composition is formulated with specific viscosity parameters (5-50 cP at room temperature) that enable inkjet deposition. This parameter change allows the adhesive to be applied in a more flexible and cost-effective manner while maintaining precise application.
2Manufacturing precision
If optically clear adhesive is precisely cut to fit films accurately, then adhesion performance is improved, but production complexity increases
Solution Approach 1:
The patent replaces complex mechanical cutting operations with a simpler inkjet printing process. The liquid adhesive composition can be directly deposited onto the film without requiring precise mechanical cutting, thereby reducing production process complexity while maintaining adhesion performance.
Solution Approach 2:
The adhesive composition is pre-formulated with specific viscosity and compositional parameters that enable direct inkjet printing application. This preliminary preparation of the adhesive in liquid form eliminates the need for subsequent cutting operations, simplifying the overall production process.
3Ease of operation
If adhesive viscosity is reduced for inkjet printing, then ease of application is improved, but adhesion strength may deteriorate
Solution Approach 1:
The patent optimizes the viscosity parameter to a specific range (5-50 cP at room temperature) that balances inkjet printability with adhesion strength. This parameter optimization ensures the adhesive flows sufficiently for inkjet deposition while maintaining adequate bonding strength after curing.
Solution Approach 2:
The adhesive composition is formulated as a complex mixture of multiple components including monomers (first monomer with hydroxy group, second monomer without hydroxy group, third monomer with terminal heterocyclic group, fourth monomer with alkylene glycol group), oligomer, silane coupling agent, and photoinitiator. This composite formulation achieves the desired balance between low viscosity for inkjet printing and high adhesion strength after polymerization.
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 enables cost-effective and precise application of the adhesive, maintaining high adherence performance and reliability in various temperature and humidity environments, enhancing the folding reliability of foldable displays.
Implementation Method 1
a photoinitiator, wherein the composition has a viscosity of 5 centipoise to 50 centipoise at room temperature. The composition provides a capability for application by inkjet-printing at about room temperature.
Implementation Method 2
a silane coupling agent
Data Source
AI summary
A composition including a first monomer including a hydroxy group, a second monomer that does not include a hydroxy group, a third monomer including a terminal heterocyclic group, a fourth monomer including an alkylene glycol, an oligomer, a silane coupling agent, and a photoinitiator. The composition has a viscosity of 5 centipoise to 50 centipoise at about room temperature.