Polarizing Plate UV Curing for Adhesive Force and Water Resistance
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Solution Overview
Problem
Existing polarizing plates for OLED panels face challenges in achieving effective anti-reflection, sufficient adhesive force, water resistance, and thinness due to limitations with ultraviolet curable adhesives and water-based adhesives, particularly with reverse dispersion liquid crystal polarizers.
Innovation Solution
A method involving an optical laminate with a first and second adhesive layer, a linear polarizer, and a reverse dispersion liquid crystal layer, where ultraviolet rays are irradiated in a specific wavelength band to cure the adhesive layers, enhancing adhesive force and water resistance while allowing for thinning and rolling of the polarizing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultraviolet curable adhesive is used to attach reverse dispersion liquid crystal polarizer to linear polarizer, then water resistance is improved, but adhesive force is lowered due to insufficient curing from UV blocking by reverse dispersion liquid crystals
Solution Approach 1:
The adhesive layer is segmented into multiple functional zones: a first adhesive layer on the base film side that cures with UV light, and a second adhesive layer on the liquid crystal side that provides additional bonding. This segmentation allows each layer to perform its specific function optimally without interference from the liquid crystal's UV blocking properties.
Solution Approach 2:
The base film acts as an intermediary layer between the UV light source and the adhesive layers. It allows UV light to pass through to cure the first adhesive layer while protecting the liquid crystal layer from direct UV exposure that would cause curing issues. This intermediary approach resolves the contradiction between needing UV curing for water resistance and avoiding UV blocking by the liquid crystal.
2Strength
If water-based adhesive is used instead of ultraviolet curable adhesive, then adhesive force is improved, but water resistance deteriorates and vulnerability to high-humidity environments increases
Solution Approach 1:
The adhesive system uses a composite approach combining UV curable adhesive properties with water-based adhesive characteristics. The adhesive layer is formulated to provide both the bonding strength of water-based adhesives and the water resistance of UV curable adhesives, creating a hybrid material that resolves the contradiction between adhesive force and water resistance.
3Ease of operation
If pressure-sensitive adhesive is used to attach circular polarizer to general polarizing plate, then ease of attachment is improved, but thickness increases and number of processes increases
Solution Approach 1:
The attachment function and the adhesive layer are merged into a single integrated layer rather than being separate components. The adhesive layer is directly formed as part of the polarizing plate structure, eliminating the need for additional pressure-sensitive adhesive layers and reducing overall thickness while maintaining ease of attachment.
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 method results in a polarizing plate with excellent anti-reflection performance across a wide visible light range, sufficient adhesive force, and improved water resistance, suitable for OLED panels, enhancing visual appreciation and durability while enabling miniaturization and rollability.
Implementation Method 1
irradiating an optical laminate including a first base film (101), a first adhesive layer (201), a linear polarizer (300), a second adhesive layer (202), a second base film (102) and a reverse dispersion liquid crystal layer (400) sequentially with ultraviolet rays (UV)
Data Source
AI summary
Provided is a method for manufacturing a polarizing plate, comprising a step of irradiating an optical laminate with ultraviolet rays having an emission wavelength band of 380 nm to 410 nm. The optical laminate sequentially comprises a first base film, a first adhesive layer, a linear polarizer, a second adhesive layer, a second base film and a reverse dispersion liquid crystal layer. The first adhesive layer and the second adhesive layer each comprise a photosensitizer for initiating a curing reaction in a wavelength band of 350 nm to 410 nm, and the ultraviolet rays are irradiated on the first base film side of the optical laminate.