Polyimide Shatterproof Layer Composition for Low-Curl Display Glass
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Solution Overview
Problem
Conventional polyimide films used in display devices face issues with curling due to thermal expansion differences and reduced surface hardness when applied to ultrathin tempered glass, compromising their mechanical properties and shatter resistance.
Innovation Solution
A polyimide precursor composition is developed, comprising a specific structure derived from an acid anhydride or diamine and inorganic particles, which minimizes curling and enhances surface hardness by incorporating stress relaxation segments and a mixed solvent system with negative and positive distribution coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyimide film is designed for flexible structure to reduce breaking upon impact or bending, then mechanical properties and flexibility are improved, but curling occurs due to thermal expansion differences
Solution Approach 1:
The patent modifies the chemical structure of the polyimide precursor by introducing specific siloxane structures with controlled alkyl and aryl groups (R1-R4, L1-L2, x, y parameters) to adjust thermal expansion characteristics and reduce curling while maintaining mechanical properties
Solution Approach 2:
The patent creates a composite polyimide film by combining polyimide precursor with inorganic particles, forming a multilayer structure that integrates the flexibility and toughness of polyimide with the dimensional stability of inorganic components, thereby reducing thermal expansion-induced curling
2Adaptability or versatility
If polyimide film is designed for flexible structure, then flexibility is improved, but surface hardness is compromised
Solution Approach 1:
The patent forms a composite structure combining flexible polyimide matrix with dispersed inorganic particles, where the inorganic phase provides surface hardness and wear resistance while the polyimide matrix maintains flexibility and bendability
Solution Approach 2:
The patent creates local reinforcement by distributing inorganic particles within the polyimide film, providing enhanced surface hardness at the particle locations while the bulk material retains its flexibility and elongation properties
3Illumination intensity
If polyimide film aims to be colorless and transparent, then optical properties are improved, but mechanical properties for flexible structures are insufficient
Solution Approach 1:
The patent develops a transparent composite film by carefully selecting inorganic particles with refractive indices matched to the polyimide matrix and controlling particle size and distribution, maintaining optical transparency while enhancing mechanical strength and flexibility
Solution Approach 2:
The patent optimizes the chemical structure parameters of the polyimide precursor (molecular weight, functional groups, side chain length) to achieve a balance between optical clarity and mechanical performance, ensuring the film is both transparent and mechanically robust for flexible displays
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 composition results in a polyimide film with improved thermal stability, reduced curling, and increased surface hardness, suitable for flexible display devices, while maintaining transparency and mechanical integrity.
Implementation Method 1
alleviating thermal expansion-extraction behavior
Implementation Method 2
incorporating silica nanoparticles
Data Source
AI summary
Provided are polyimide precursor composition including a polyimide precursor including a siloxane structure, and inorganic particles, and an optical multilayer structure including a structure in which a polyimide shatterproof layer formed using the composition is formed on a substrate. The optical multilayer structure according to one implementation is less curled to minimize substrate bending and has significantly improved surface hardness, and thus, has excellent mechanical properties.