Cross-linked Polyimide for Display Transparency and Heat Resistance
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Solution Overview
Problem
Current colorless transparent materials used in optical lenses and display devices lack the necessary combination of transparency, heat resistance, mechanical strength, and flexibility as these devices become more miniaturized and require higher performance.
Innovation Solution
A polyimide precursor composition is developed, comprising specific polyamic acid compounds and cross-linking agents, which are processed to form cross-linked polyimides with improved optical properties, mechanical strength, and heat resistance, suitable for use in display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional colorless transparent materials are used, then transparency is maintained, but heat resistance and mechanical strength are insufficient
Solution Approach 1:
The patent uses a composite material system consisting of polyamic acid and crosslinking agents to create crosslinked polyimide. This composite approach combines the transparency of polyimide with the heat resistance and mechanical strength provided by the crosslinked network structure, resolving the contradiction between transparency and thermal/mechanical performance.
Solution Approach 2:
The patent changes the chemical structure parameters of the polyimide by introducing crosslinking agents with specific functional groups (isocyanate, epoxy, or carboxyl groups). This parameter change transforms the linear polyimide chains into a three-dimensional crosslinked network, significantly improving heat resistance and mechanical strength while preserving transparency.
2Strength
If material performance is improved for miniaturized devices, then heat resistance and mechanical strength increase, but transparency may deteriorate
Solution Approach 1:
The patent applies local quality by creating a crosslinked network structure that is distributed throughout the material matrix. The crosslinking points are locally concentrated in specific regions, providing enhanced mechanical strength and heat resistance at those points while maintaining the overall transparency of the bulk material.
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 provides articles with enhanced transparency, mechanical strength, and heat resistance, making them suitable for diverse applications including display devices, optical films, and protective films for optical disks.
Implementation Method 1
a cross-linking agent selected from a compound represented by Chemical Formula 4, a compound represented by Chemical Formula 5, and a combination thereof
Data Source
AI summary
Disclosed are a polyimide precursor composition that includes a polyamic acid selected from compounds represented by Chemical Formulae 1 to 3, and a combination thereof; and a cross-linking agent selected from a compound represented by Chemical Formula 4, a compound represented by Chemical Formula 5, and a combination thereof; an article including a cross-linked polyimide using the same; and a display device including the article.