Polyimide Flexible Substrate with Rigid and Flexible Regions
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Solution Overview
Problem
Flexible substrates made of polyimide materials in display panels deform or break under repeated bending due to high stress, and existing methods to reduce stress, such as forming grooves or protrusions with a laser, can damage the substrate and impact performance.
Innovation Solution
A flexible substrate with a polyimide film divided into rigid and flexible regions, where the rigid segments constitute 75-95% by weight and flexible segments 80-98% by weight, with a surface roughness of less than 1 nanometer, manufactured by coating polyamic acid solutions and heat treatment, without forming grooves or protrusions with a laser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If grooves or protrusions are formed on the flexible substrate by laser, then the stress of the flexible substrate is reduced, but the formed grooves or protrusions cause damage to the flexible substrate, resulting in impact on the performance
Solution Approach 1:
The patent applies local quality by creating distinct rigid and flexible regions within the polyimide film through controlled composition gradients. The rigid regions (with higher polyimide content) provide stress reduction, while the flexible regions (with lower polyimide content) maintain substrate integrity and performance, avoiding the need for laser-induced grooves or protrusions that damage the substrate.
2Adaptability or versatility
If the flexible substrate is made of polyimide material, then the substrate provides flexibility, but during repeated bending or folding, the flexible substrate deforms or even breaks due to a large stress
Solution Approach 1:
The patent employs composite materials by creating a polyimide film with spatially varying composition - combining rigid segments (high polyimide content) and flexible segments (low polyimide content) in a single integrated structure. This composite approach allows the substrate to simultaneously exhibit flexibility for bending and enhanced strength to resist deformation and breaking, without requiring separate components or laser modifications.
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 substrate's performance is improved by enhancing heat resistance, dimensional stability, and flexibility, while maintaining a smooth surface, thus reducing stress without damaging the substrate.
Implementation Method 1
heating the solution of the first polyamic acid and the solution of the second polyamic acid on the glass substrate to form a flexible substrate, which is a polyimide film
Data Source
AI summary
The present application provides a flexible substrate and a method of manufacturing the same. The flexible substrate includes a base substrate, the flexible substrate is a polyimide film, wherein the polyimide film comprises polyimide having a structural formula ofand the polyimide has a rigid segment and a flexible segment. The polyimide film is divided into rigid regions and a flexible region, wherein the rigid region is mainly constituted by the rigid segment, and the flexible region is mainly constituted by the flexible segment. Because the polyimide has the rigid segment and the flexible segment, it is used in flexible substrates.