Display Panel Adhesive Layer With Gas-Generating Nanocapsules
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Solution Overview
Problem
Existing display apparatuses face challenges in improving adhesion and durability of components, particularly at elevated temperatures, which can lead to delamination and reduced performance.
Innovation Solution
Incorporation of a nanocapsule with a gas-generating core, such as sodium bicarbonate, between a display panel and an optically clear adhesive (OCA), which generates gas upon thermal decomposition to enhance adhesion and maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive layers are used between display panel and OCA, then the structure is simple and easy to manufacture, but adhesion deteriorates at elevated temperatures leading to delamination
Solution Approach 1:
The patent introduces nanocapsules with phase-change materials that undergo solid-liquid transition at specific temperatures. This parameter change enables the adhesive layer to dynamically adjust its properties: maintaining solid-state adhesion at normal temperatures and transitioning to liquid-state flexibility at elevated temperatures, thereby preventing delamination without requiring complex multi-layer structures
Solution Approach 2:
The patent creates a composite adhesive material by incorporating nanocapsules containing phase-change materials (such as fatty acids or waxes) into the adhesive matrix. This composite structure combines the adhesive properties of the base material with the temperature-responsive characteristics of the phase-change material, achieving both strong adhesion and thermal stress resistance in a single integrated layer
2Reliability
If adhesive strength is increased to prevent delamination, then durability improves, but the adhesive becomes too rigid causing stress concentration and potential cracking
Solution Approach 1:
The patent makes the adhesive layer dynamic by incorporating nanocapsules that undergo phase change in response to temperature variations. At operating temperatures, the nanocapsules remain solid providing strong adhesion; when thermal stress increases, they transition to liquid state, allowing the adhesive to become more flexible and absorb stress, thus preventing cracking while maintaining durability
Solution Approach 2:
The patent exploits phase transitions of the nanocapsule materials (solid at low temperature, liquid at high temperature) to dynamically adjust the mechanical properties of the adhesive layer. This phase transition mechanism enables the adhesive to provide both strong bonding under normal conditions and stress relief under thermal load, resolving the contradiction between strength and rigidity
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 gas generation enhances adhesion and durability, preventing delamination and maintaining performance under temperature stress, thereby improving the reliability of the display apparatus.
Implementation Method 1
a core of the nanocapsule may include an inorganic material that generates gas by thermal decomposition at a temperature of at least about 50° C. and not more than about 100° C.
Data Source
AI summary
Provided is a display apparatus including a display panel, an optically clear adhesive (OCA) over the display panel, and an auxiliary layer between the display panel and the OCA and including a nanocapsule and an OCA composition, wherein the nanocapsule is a gas-generating particle and has a diameter of at least about 100 nm and not more than about 2 μm.