Polyimide-Inorganic Composite Material for Transparent Displays
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Solution Overview
Problem
There is a need for a colorless transparent material with excellent transparency, heat resistance, mechanical strength, and flexibility to support high-resolution applications in miniaturized information devices and display devices, as conventional polyimides lack suitable thermal stability and mechanical properties while maintaining transparency.
Innovation Solution
A composition for a polyimide-inorganic composite material is developed, comprising a polyamic acid or polyimide combined with an inorganic particle precursor, where the mole ratio of diamine to dicarboxylic acid anhydride is between 0.93 and 0.95, and the inorganic particle content is between 30% to 60% by weight, enhancing thermal expansion coefficients and maintaining high transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional polyimide is used to maintain transparency, then optical clarity is improved, but thermal stability and mechanical strength deteriorate
Solution Approach 1:
The patent creates a composite material combining polyimide with inorganic particles (such as silica, alumina, or boehmite) to achieve both transparency and enhanced thermal stability. The inorganic particles are dispersed within the polyimide matrix, allowing the material to maintain optical clarity while gaining improved heat resistance and mechanical properties.
2Reliability
If inorganic particles are added to improve thermal resistance, then heat stability is improved, but transparency deteriorates
Solution Approach 1:
The patent carefully controls the particle size, concentration, and surface treatment of inorganic particles to optimize both heat resistance and transparency. By adjusting these parameters, the material achieves enhanced thermal stability while maintaining adequate optical clarity for display applications.
3Stability of the object's composition
If high inorganic particle content is used to reduce thermal expansion, then dimensional stability is improved, but mechanical flexibility deteriorates
Solution Approach 1:
The patent optimizes the inorganic particle content, size distribution, and surface modification to achieve the desired balance between dimensional stability and mechanical flexibility. The specific composition ranges and processing conditions are controlled to ensure the material maintains both low thermal expansion and adequate flexibility for device applications.
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 polyimide-inorganic composite material achieves high transparency and low thermal expansion coefficients, suitable for high-temperature processes, balancing transparency and thermal resistance, making it suitable for applications like OLED displays.
Implementation Method 1
a polyamic acid represented by Chemical Formula 1, a polyimide represented by Chemical Formula 2, or a combination thereof; an inorganic particle precursor; and water
Data Source
AI summary
A composition for preparing a polyimide-inorganic composite material including: a polyamic acid represented by Chemical Formula 1, a polyimide represented by Chemical Formula 2, or a combination thereof; an inorganic particle precursor; and water, wherein the polyamic acid, the polyimide, or the combination thereof is a reaction product of a dicarboxylic acid anhydride and a diamine, wherein the mole ratio of the diamine to the dicarboxylic acid anhydride is greater than 0.93 and less than 0.95, and wherein the inorganic particle precursor is included in an amount to provide an inorganic particle in an amount of greater than or equal to about 30 weight % and less than or equal to about 60 weight % based the total weight of the polyimide-inorganic composite material prepared:wherein in Chemical Formulae 1 and 2, groups and variable are the same as defined in the specification.