Display Panel Adhesive Modulus for High-Temperature Warping
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Solution Overview
Problem
Existing display panels suffer from warping issues in high temperature environments due to insufficient adhesive layer properties.
Innovation Solution
A display panel structure with a second adhesive layer having a storage modulus of 40 KPa or lower at 85° C. or higher and 95° C. or lower, and a specific modulus range to minimize warping, combined with polarizing plates having perpendicular transmission axes and no phase difference film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive layers are used in display panels, then bonding strength is maintained, but warping occurs in high temperature environments
Solution Approach 1:
The patent changes the physical-chemical parameters of the adhesive layer by controlling its glass transition temperature to be 50°C or higher and storage modulus to be 40 kPa or lower at high temperatures (85-95°C). This parameter optimization allows the adhesive to maintain bonding strength while reducing warping in high temperature environments.
Solution Approach 2:
The patent uses composite material design by combining specific adhesive materials with polarizing plates having perpendicular transmission axes. The adhesive layer is formulated as a composite with controlled glass transition temperature and storage modulus characteristics to achieve both bonding strength and warping resistance.
2Strength
If adhesive layers with high storage modulus are used, then structural rigidity is improved, but warping increases in high temperature environments
Solution Approach 1:
The patent optimizes the storage modulus parameter of the adhesive layer to be 40 kPa or lower at 85-95°C, which is a specific parameter change that allows the adhesive to remain flexible enough to accommodate thermal expansion differences while maintaining bonding, thereby reducing warping in high temperature environments.
Solution Approach 2:
The adhesive layer's mechanical properties are made dynamic with respect to temperature. The storage modulus is controlled to be temperature-dependent, allowing the adhesive to provide structural rigidity at operating temperatures while accommodating thermal stress through controlled flexibility in the 85-95°C range.
3Illumination intensity
If polarizing plates with phase difference films are used, then optical performance is improved, but warping resistance is reduced in high temperature environments
Solution Approach 1:
The patent employs a composite structure where polarizing plates with phase difference films are combined with a specifically formulated adhesive layer. The adhesive layer's controlled glass transition temperature and storage modulus compensate for the warping tendency of the phase difference film, achieving both optical performance and warping resistance.
Solution Approach 2:
The patent applies local quality by having different layers with different properties: the polarizing plates provide optical performance with phase difference films, while the adhesive layer provides mechanical stability and warping resistance through controlled glass transition temperature and storage modulus. Each layer performs its specialized function.
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 display panel exhibits reduced warping in high temperature environments, maintaining structural integrity and preventing bonding misalignment.
Implementation Method 1
a second adhesive layer, and a second polarizing plate including no phase difference film and with a second transmission axis perpendicular to the first transmission axis, the second adhesive layer having a storage modulus G′ of 40 KPa or lower at 85° C. or higher and 95° C. or lower
Data Source
AI summary
Provided is a display panel that is less warped in high temperature environments. The display panel includes, in order, a first polarizing plate with a first transmission axis, a first adhesive layer, a display cell, a second adhesive layer, and a second polarizing plate including no phase difference film and with a second transmission axis perpendicular to the first transmission axis. The second adhesive layer has a storage modulus G′ of 40 KPa or lower at 85° C. or higher and 95° C. or lower. The second adhesive layer preferably has a storage modulus G′ of 5 KPa or higher and 40 KPa or lower at 85° C. or higher and 95° C. or lower.