Microcup Composition for Peelable Substrate Separation
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Solution Overview
Problem
The existing methods for forming microcup display panels face challenges in separating the microcup layer from the substrate without damage, as traditional approaches either complicate microembossing or result in insufficient voltage due to increased microcup thickness or decreased optical performance from thicker partition walls.
Innovation Solution
A composition comprising a difunctional UV curable component, a photoinitiator, and a mold release agent is used to form microcups, which can be easily separated from the substrate while maintaining structural integrity and optical performance, with the option of adding a co-initiator, monofunctional or multifunctional UV curable components, and stabilizers for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release layer is added between the display panel and substrate layer to facilitate separation, then the ease of separation is improved, but the microembossing process becomes more difficult and the mold may get stuck in partially cured microcups
Solution Approach 1:
The patent introduces a release layer as an intermediary component between the microcup structure and the substrate. This release layer serves as a mediator that enables easy separation after microembossing while not interfering with the microembossing process itself, thus resolving the contradiction between ease of separation and ease of manufacture
Solution Approach 2:
The release layer is applied to the substrate before the microcup formation process begins. This preliminary action ensures that when separation is needed, the microcups can be easily released without damaging the mold or the display panel structure
2Strength
If the thickness of the bottom of the microcups is increased to withstand peel force, then the strength is improved, but the voltage drop at the microcup bottom increases leading to insufficient voltage for driving display fluid
Solution Approach 1:
The patent modifies the physical and chemical parameters of the microcup material composition, specifically using a cured composition with elongation at break of at least 10%. This parameter change allows the microcup bottom to maintain adequate strength for separation while preserving sufficient electrical conductivity for driving the display fluid
Solution Approach 2:
The patent employs a composite material composition for the microcups comprising UV curable components, photoinitiators, and other additives. This composite material provides both the mechanical strength needed for separation and the electrical properties required for driving the display fluid, resolving the contradiction between strength and energy use
3Strength
If the thickness of the partition walls separating the microcups is increased, then the strength is improved, but the fill factor decreases resulting in unsatisfactory optical performance
Solution Approach 1:
The patent changes the material parameters of the partition walls by using a cured composition with specific mechanical properties (elongation at break ≥ 10%). This allows the partition walls to maintain adequate strength with minimal thickness, thereby preserving the fill factor and optical performance
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 microcup layer can be completely peeled off from the substrate with improved toughness, achieving more than 10% elongation at break without damage, and the panel maintains satisfactory optical performance.
Implementation Method 1
a composition for forming microcups, which comprises: (a) at least one difunctional UV curable component; (b) at least one photoinitiator
Data Source
Figure 1a
Figure 1b
Figure 2a~2b
AI summary
The present invention is directed to a composition for preparing the microcups and the toughness of the display panel formed from such a composition may be significantly improved. In some cases, the panel may have an elongation at break of more than 10% and it can be completely peeled off from the substrate layer on which it is formed, without causing any damage to the panel.