Flexible Display Protective Window Hard Coating Moisture Resistance
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Solution Overview
Problem
Flexible display devices using plastic films face durability issues due to the inherent softness of plastic substrates, leading to potential damage from moisture absorption, wrinkles, whitening, or cracks, which existing technologies have not adequately addressed.
Innovation Solution
A protective window with a hard coating layer comprising a silicone leveling agent and an inorganic antistatic agent is applied to a flexible base film, featuring a higher density of antistatic agents in the upper area, reducing moisture absorption and enhancing adhesion, while an interfacial layer with a thickness of less than 1 μm improves the bonding between the coating and the film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a plastic film is used as a window to reduce weight and enable flexibility, then the display device achieves reduced weight and flexible form factor, but the plastic substrate becomes soft and vulnerable to damage from moisture absorption, wrinkles, whitening, or cracks
Solution Approach 1:
The patent applies composite materials by combining a plastic base film with a hard coating layer containing inorganic antistatic agents and silicone leveling agents. This composite structure provides both the flexibility and light weight of plastic substrates while adding the durability, moisture resistance, and mechanical strength of inorganic materials, thereby resolving the contradiction between weight reduction and reliability enhancement
Solution Approach 2:
The patent uses a flexible base film as the substrate and applies a thin hard coating layer (few micrometers to tens of micrometers) on its surface. This thin film approach maintains the flexibility and light weight characteristics of the plastic substrate while providing protective functions, thus resolving the contradiction between maintaining flexibility and improving durability
2Reliability
If a hard coating layer with inorganic antistatic agent and silicone leveling agent is applied to the flexible base film, then moisture absorption is reduced and adhesion is enhanced, but the device complexity increases due to additional layers and materials
Solution Approach 1:
The patent merges multiple functions into a single hard coating layer: moisture barrier function (through inorganic antistatic agents like metal oxides), adhesion enhancement (through silicone leveling agents), and mechanical protection. This consolidation of multiple protective functions into one layer reduces the number of separate components needed, thereby resolving the contradiction between improving reliability and reducing device complexity
3Object-affected harmful factors
If the density of inorganic antistatic agent in the upper area of the hard coating layer is increased, then moisture absorption is reduced, but the manufacturing precision requirements increase due to the need for controlled density distribution
Solution Approach 1:
The patent applies local quality by creating a non-uniform density distribution of inorganic antistatic agents within the hard coating layer, with higher concentration in the upper area (facing the environment) and lower concentration in the lower area (near the base film). This localized variation in material density optimizes moisture barrier performance where it is most needed while simplifying the overall manufacturing process, thereby resolving the contradiction between reducing moisture absorption and maintaining manufacturing precision
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 significantly reduces moisture absorption, prevents damage such as wrinkles or cracks, and enhances adhesion with an anti-fingerprint layer, ensuring improved reliability and durability of the display device under high humidity and temperature conditions.
Implementation Method 1
a moisture absorption of the hard coating layer may be reduced
Implementation Method 2
a surface roughness (RMS) of the hard coating layer may be increased. Thus, adhesion with an anti-fingerprint layer may be increased
Implementation Method 3
a coating composition for forming the hard coating layer may include a (meth)acrylate compound, a photoinitiator
Data Source
AI summary
A protective window includes a flexible base film and a hard coating layer disposed on the flexible base film. The hard coating layer includes a silicone leveling agent and an inorganic antistatic agent. The coating layer includes an upper area and a lower area disposed between the upper area and the flexible base film, and a density of the inorganic antistatic agent in the lower area is greater than a density of the inorganic antistatic agent in the upper area.