Flexible Display Window Coating for Static and Touch Noise
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Solution Overview
Problem
Flexible display devices using polymer film windows are prone to static electricity issues, leading to potential touch noise and reduced reliability.
Innovation Solution
Incorporating an anti-static agent in the window panel, with a surface resistance between 10^9 and 10^13 ohms/square, to mitigate static electricity and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polymer film type window is used to achieve flexibility, then portability and user convenience are improved, but static electricity problems occur more frequently
Solution Approach 1:
An anti-static layer is introduced as an intermediary between the polymer film window and the environment. This layer contains anti-static agents (ionic liquids or metal compounds) that mediate the interaction between the flexible polymer material and external factors, preventing static electricity accumulation while preserving the flexibility of the polymer film substrate.
Solution Approach 2:
The surface resistance of the window panel is modified by incorporating anti-static agents into the functional layer. The surface resistance is controlled within a specific range (10^9 to 10^13 ohms/square) to effectively dissipate static electricity while maintaining the flexible properties of the polymer film material.
2Adaptability or versatility
If a polymer film type window is used, then flexible properties are achieved, but touch noise problems increase
Solution Approach 1:
The anti-static layer serves as a mediator that also reduces touch noise. By controlling the surface resistance and providing a specialized interface layer, it dampens the electrical discharge effects that cause touch noise, allowing the polymer film to maintain its flexible properties without generating excessive noise during touch operations.
3Reliability
If an anti-static agent is incorporated in the window panel, then anti-static properties are improved, but surface resistance must be precisely controlled
Solution Approach 1:
The patent specifies precise parameter ranges for the anti-static functional layer: surface resistance between 10^9 and 10^13 ohms/square, and anti-static agent content at 5-15 wt% of the functional layer. These controlled parameters ensure reliable anti-static performance while providing clear manufacturing specifications to achieve consistent results.
Solution Approach 2:
The functional layer is designed as a composite material combining polymer matrix with dispersed anti-static agents (ionic liquids or metal compounds). This composite structure allows tuning of surface resistance through composition control, achieving the desired 10^9 to 10^13 ohms/square range while maintaining manufacturability through standardized material formulations.
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 anti-static agent enhances the display device's anti-static properties, reducing touch noise and improving reliability by maintaining optimal surface resistance.
Implementation Method 1
a functional layer disposed on an upper portion of the base film and including a hard coating agent and an anti-static agent... having a surface resistance greater than about 10 9
Data Source
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AI summary
A display device includes a display module and a window panel disposed on an upper portion of the display module. The window panel includes a base film, and a functional layer disposed on an upper portion of the base film and having a hard coating agent and an anti-static agent.