Resin Composition for Flexible Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polyimide resin compositions used in flexible substrates and displays face challenges in achieving a balance between mechanical strength, surface smoothness, and light transmittance, particularly when high molecular weight cellulose compounds are incorporated, leading to degraded surface smoothness and light transmittance.
Innovation Solution
A resin composition comprising a polyamic acid with a specific structural unit, a cellulose compound having a weight average molecular weight of 60,000 or less, and an organic solvent, which improves solubility and reduces surface roughness, thereby enhancing the balance between mechanical strength, surface smoothness, and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high molecular weight cellulose compound (weight average molecular weight > 60,000) is used in the polyimide precursor solution, then the mechanical strength and flexibility of the cured article are improved, but the surface smoothness and light transmittance are degraded
Solution Approach 1:
The patent applies parameter changes by specifying that the weight average molecular weight of the cellulose compound must be 60,000 or less. This quantitative parameter adjustment resolves the contradiction by finding the optimal molecular weight threshold that maintains mechanical strength while preventing surface roughness and transmittance degradation caused by higher molecular weight cellulose compounds.
2Strength
If a high molecular weight cellulose compound (weight average molecular weight > 60,000) is used in the polyimide precursor solution, then the mechanical strength and flexibility of the cured article are improved, but the light transmittance is degraded
Solution Approach 1:
The patent resolves this contradiction by establishing a specific parameter threshold for the cellulose compound's weight average molecular weight (60,000 or less). This parameter control ensures that the cellulose compound provides adequate mechanical strength while maintaining sufficient light transmittance for flexible display applications.
3Manufacturing precision
If the cellulose compound molecular weight is reduced to 60,000 or less, then the surface smoothness and light transmittance are improved, but the mechanical strength may be compromised
Solution Approach 1:
The patent identifies 60,000 as the critical molecular weight threshold that balances surface smoothness and mechanical strength. By controlling the cellulose compound's weight average molecular weight to be 60,000 or less, the invention achieves optimal surface quality while maintaining adequate mechanical properties for flexible substrate 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 proposed resin composition achieves a cured article with improved mechanical strength, surface smoothness, and light transmittance, making it suitable for flexible substrates and displays.
Implementation Method 1
heating step of heating the coating film at 70 to 550° C.
Data Source
AI summary
A resin composition resulting in a cured article which is excellent in balance among mechanical strength, surface smoothness, and light transmittance, a method for producing a cured article, a cured article, and a flexible substrate or flexible display including the cured article. The resin composition includes a polyamic acid having a structural unit represented by the following formula (1), a cellulose compound having a weight average molecular weight of 60,000 or less, and an organic solvent.In the formula (1), A is a tetravalent organic group and B is a divalent organic group.