Polarizing Plate Composition for High Humidity Durability
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining durability and preventing deterioration at high temperatures and high humidity, particularly in polarizing plates, where changes in orthogonal transmittance and adhesiveness are affected by environmental conditions.
Innovation Solution
A polarizing plate composition containing a specific compound represented by Formula (I), which includes electron-withdrawing groups and is used in the polarizing plate protective film and adhesive layer, enhances durability and adhesiveness by inhibiting changes in orthogonal transmittance and preventing bleed-out due to moisture exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the polarizing plate protective film is made thinner to meet the requirement for bigger and thinner liquid crystal display devices, then the device thickness is reduced, but the cutting properties and workability deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the polarizing plate protective film. Specifically, it controls the content of carboxylic acid groups (0.1-5.0 mmol/g) and incorporates specific compounds (Formula I) with electron-withdrawing groups to adjust the film's properties. This allows the thin film to maintain adequate cutting properties while meeting the thickness reduction requirement for modern display devices.
2Adaptability or versatility
If the polarizing plate protective film is exposed to high temperature and high humidity environments, then the device can be used in more diverse conditions, but the orthogonal transmittance changes and durability deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by incorporating specific compounds (Formula I) containing electron-withdrawing groups into the polarizing plate protective film before exposure to harsh environments. These compounds pre-establish protective chemical structures that resist hydrolysis and maintain film integrity. The carboxylic acid group content is controlled to prevent excessive moisture absorption, thereby preventing orthogonal transmittance changes and maintaining durability in high temperature and high humidity conditions.
3Strength
If adhesive layers are used to assemble the polarizing plate, then the structural integrity is improved, but the adhesive undergoes bleed out due to deterioration of compatibility and exposure to moist heat
Solution Approach 1:
The patent applies parameter changes to the adhesive layer by controlling the carboxylic acid group content (0.1-5.0 mmol/g) and incorporating specific compounds (Formula I). These modifications adjust the adhesive's chemical parameters to improve compatibility with adjacent layers and resist moisture-induced deterioration, preventing bleed out while maintaining structural integrity under high temperature and high humidity conditions.
Data Source
AI summary
A polarizing plate composition, a polarizing plate protective film, a polarizer, a polarizing plate, and a liquid crystal display device contain a compound represented by the following Formula (I).In Formula (I), R represents a specific substituent, and each of EWG1 and EWG2 represents an electron-withdrawing group. EWG1 and EWG2 may form a ring by being bonded to each other. Here, there is no such case where EWG1 and EWG2 become the following group by being bonded to each other and form a ring by being bonded to a carbon atom substituted with R.Each of Rx and Ry represents a hydrogen atom or a substituent. * represents a position of bonding to a carbon atom substituted with R.