Polyamide-imide Optical Film for Display Devices
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Solution Overview
Problem
Current optical films used as cover windows in display devices lack excellent optical and mechanical stability, particularly in terms of light transmittance and chemical stability, due to high chlorine concentrations and acid generation during polymerization, which affects their durability and display quality.
Innovation Solution
An optical film is developed containing a polymer with regularly and alternately arranged amide and imide repeating units, formed through a specific polymerization structure without the need for dicarbonyl and diamine compound polymerization, resulting in low chlorine content and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymerization methods using dicarbonyl and diamine compounds are used, then polymer production is achieved, but high chlorine concentration and acid generation occur, deteriorating optical stability and chemical stability
Solution Approach 1:
The invention extracts and eliminates the harmful dicarbonyl compound component from the polymerization system. By using only diamine compounds with specific structures containing both amide and imide groups, the method removes the source of chlorine generation and acid production, thereby resolving the contradiction between achieving polymer production and avoiding harmful byproducts
Solution Approach 2:
The invention changes the chemical composition parameters of the polymer by selecting specific diamine compounds with unique molecular structures. This parameter change in the monomer composition leads to a polymer that inherently produces no chlorine or acid during polymerization, thus improving optical and chemical stability while eliminating harmful factors
2Weight of moving object
If optical film thickness is reduced to decrease weight and increase flexibility, then device portability is improved, but mechanical strength and protective capability are deteriorated
Solution Approach 1:
The invention creates a composite polymer structure containing both amide repeating units and imide repeating units within the same polymer chain. This composite structure at the molecular level provides exceptional mechanical strength and rigidity, enabling the optical film to maintain high protective capability even at reduced thickness, thus resolving the contradiction between weight reduction and strength maintenance
3Ease of manufacture
If polymer structure is simplified to ease manufacturing, then production complexity is reduced, but optical properties and stability are deteriorated
Solution Approach 1:
The invention segments the polymer structure into distinct amide repeating units and imide repeating units that are regularly alternately arranged. This segmentation approach allows each unit to contribute specific properties: amide units provide flexibility and processability, while imide units provide thermal stability and chemical resistance. The regular alternating pattern ensures both ease of manufacturing through simple copolymerization and superior optical properties through structured molecular arrangement
Data Source
AI summary
The present invention relates to a polyamide-imide based precursor, a polymer prepared from the precursor, an optical film comprising the polymer, and a display device comprising the optical film. A polymer according to an embodiment of the present invention comprises amide repeating units and imide repeating units that are disposed uniformly and alternately, and an optical film comprising such a polymer can exhibit excellent light transmittance, a low yellow index (Y.I), and superb stability.