Asymmetric Polyimide Film for Flexible Display Window Covers
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Solution Overview
Problem
Conventional polyimide-based films for window covers lack differentiation in surface properties, limiting the application of various coating compositions and affecting scratch resistance and moisture absorption resistance.
Innovation Solution
A polyimide-based film with intentionally varied resin density and surface properties between surfaces, allowing for different chemical and physical properties on each side, enabling the use of diverse coating compositions and improving flexibility and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional polyimide-based film with uniform surface properties is used, then the manufacturing process is simple, but the application of various coating compositions is limited
Solution Approach 1:
The patent applies local quality by creating different surface properties at different locations of the polyimide film. Specifically, the front surface and back surface are treated to have different resin densities and surface energies, allowing different coating compositions to be applied to different surfaces. This resolves the contradiction by enabling versatile coating application without requiring multiple uniform films.
Solution Approach 2:
The patent implements asymmetry by intentionally creating asymmetric surface properties on the polyimide film. The front surface and back surface are made chemically and physically different through controlled resin density variations and surface treatment, breaking the conventional symmetry of uniform surfaces. This asymmetric structure enables different coating compositions to bond differently to each surface, expanding application versatility.
2Stability of the object's composition
If a plastic film such as polyimide is used for window cover, then flexibility is improved, but scratch resistance and moisture absorption resistance deteriorate
Solution Approach 1:
The patent applies composite materials by combining the polyimide base film with multiple coating layers having different functionalities. The asymmetric surface properties enable selective application of coating compositions - one coating for scratch resistance on the front surface, another for moisture absorption resistance on the back surface, thus achieving reliable protection while maintaining the flexibility of the plastic film.
3Ease of manufacture
If the same coating composition is used on both surfaces of a polyimide film, then the manufacturing process is simple, but the optimization of surface-specific properties is limited
Solution Approach 1:
The patent applies preliminary action by pre-treating the polyimide film surfaces before coating application. The film is subjected to surface treatments (such as plasma treatment, corona discharge, or chemical etching) that create different surface energies and resin densities on the front and back surfaces. This preliminary differentiation enables subsequent coating compositions to be optimized for each surface while maintaining a relatively simple overall manufacturing process.
Data Source
AI summary
Provided are a polyimide-based film, a window cover film, and a display panel including the same. More particularly, a polyimide-based film having different surface properties of both surfaces is provided.