Adhesive Member Bubble Control via Urethane Monomer
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Solution Overview
Problem
Display devices face issues with bubble formation between the display panel and the cover window due to adhesive members, which can lead to reduced design flexibility and image quality, especially after the autoclave process.
Innovation Solution
An adhesive member comprising a urethane monomer with 2,6-diisopropylphenyl isocyanate, an acrylic monomer, and a photoinitiator, specifically formulated to minimize bubble occurrence by providing excellent adhesion and elasticity, is used between the display panel and the cover window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive members are used between the display panel and cover window, then adhesion is achieved, but bubbles remain in the adhesive member after autoclave process
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive member by incorporating specific ratios of acrylic monomer (40-70 wt%), urethane monomer (10-30 wt%), and photoinitiator (1-5 wt%). This parameter optimization enables the adhesive to achieve complete bubble elimination during autoclave processing while maintaining strong adhesion between the display panel and cover window.
Solution Approach 2:
The adhesive member is formulated as a composite material system combining acrylic monomer, urethane monomer, and photoinitiator. This composite composition leverages the complementary properties of each component: acrylic monomer provides adhesion strength, urethane monomer enhances elasticity and bubble resistance, and photoinitiator enables UV curing. The synergistic effect of this composite material resolves the contradiction between achieving adhesion and preventing bubble formation.
2Object-affected harmful factors
If adhesive member with high elasticity is used to reduce bubbles, then bubble permeation depth decreases, but adhesion strength may be compromised
Solution Approach 1:
The patent optimizes the elasticity parameter of the adhesive member by controlling the urethane monomer content at 10-30 wt% and the overall adhesive thickness at 50-200 μm. This parameter adjustment reduces bubble permeation depth to below 10 μm, preventing visible bubbles while maintaining adhesion strength through the optimized molecular structure and cross-linking density of the composite material.
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 adhesive member effectively reduces bubble formation and maintains adhesion strength, preventing bubble regeneration after the autoclave process, thus enhancing the display device's quality and design flexibility.
Implementation Method 1
an adhesive member comprising an acrylic monomer, a urethane monomer, and a photoinitiator
Data Source
AI summary
A display device and an adhesive member are provided. A display device according to an embodiment of the present disclosure includes: a display panel; a cover window disposed on the display panel; and a first adhesive member disposed between the display panel and the cover window, in which the first adhesive member includes a urethane monomer, and the urethane monomer includes 2,6-diisopropylphenyl isocyanate (2,6-DIPPI) of about 5 wt % or more and about 10 wt % or less with respect to a total weight of the first adhesive member.