Circularly Polarizing Plate with Antistatic Adhesive for Display Panels
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Solution Overview
Problem
Image display panels are prone to destruction due to static electricity from phase difference films, and existing adhesives fail to provide adequate adhesiveness and display performance in moisture-heat environments.
Innovation Solution
A circularly polarizing plate with an optically anisotropic layer formed by polymerizing a polymerizable liquid crystal composition, bonded to an image display panel using a pressure-sensitive adhesive containing a polymer with a specific acid value and an antistatic agent, which suppresses static electricity and enhances adhesiveness and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure-sensitive adhesive containing an antistatic agent is used to bond the phase difference film, then the adhesiveness under severe moisture-heat conditions is improved, but the birefringence index of the phase difference film changes, hindering display performance
Solution Approach 1:
The patent changes the chemical composition parameters of the pressure-sensitive adhesive by specifying a polymer with acid value of 10-50 mg KOH/g and incorporating an antistatic agent. This parameter optimization allows the adhesive to maintain stable birefringence index while providing reliable adhesiveness under severe moisture-heat conditions.
2Ease of manufacture
If a conventional pressure-sensitive adhesive is used, then the bonding process is simple, but the image display panel is prone to destruction due to static electricity from the phase difference film
Solution Approach 1:
The patent introduces an antistatic agent as an intermediary substance within the pressure-sensitive adhesive composition. This intermediary component suppresses static electricity generation from the phase difference film while maintaining the simplicity of the bonding process, preventing panel destruction without complicating manufacturing.
3Productivity
If the phase difference film is processed and mounted using conventional adhesives, then the production efficiency is maintained, but the failure rate in the mounting step increases
Solution Approach 1:
The patent creates a composite pressure-sensitive adhesive material combining a polymer with specific acid value characteristics and an antistatic agent. This composite formulation maintains efficient mounting processes while significantly reducing the failure rate through the synergistic effects of the composite components.
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 solution effectively prevents panel destruction from static electricity and maintains excellent adhesiveness and display performance even in severe moisture-heat conditions.
Implementation Method 1
a phase difference film having an optically anisotropic layer formed with a polymerizable liquid crystal composition containing a polymerizable liquid crystal compound
Data Source
AI summary
An image display device which suppresses destruction of an image display panel due to static electricity carried by a phase difference film, and has excellent adhesiveness between the phase difference film and the image display panel even in a moisture-heat environment, and a circularly polarizing plate with a photosensitive adhesive. The image display device includes a circularly polarizing plate having a linear polarizer and a phase difference film, and an image display panel in this order from a viewing side, in which the phase difference film and the image display panel are bonded by a pressure-sensitive adhesive, the phase difference film has an optically anisotropic layer obtained by polymerizing a polymerizable liquid crystal composition containing at least one kind of polymerizable liquid crystal compound having a predetermined structure, and the pressure-sensitive adhesive contains a polymer having an acid value of 1 to 30 mgKOH/g and an antistatic agent.