Optical Adhesive for LCD Metal Substrates
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Solution Overview
Problem
Existing optical adhesives for liquid crystal displays (LCDs) are often corrosive to metal components, compromising bonding integrity and stability, while also lacking optical clarity and durability under normal use conditions.
Innovation Solution
A compatibilized adhesive blend comprising a pressure-sensitive adhesive component, a high Tg polymer with acid or base functionality, and a crosslinker is used, forming an acid-base interaction that provides strong bonding, optical clarity, and resistance to corrosion, suitable for bonding substrates with metal surfaces in LCDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing optical adhesives are used to bond substrates with metal components, then bonding strength is achieved, but corrosion of metal components occurs
Solution Approach 1:
The invention modifies the chemical composition parameters of the adhesive by incorporating specific acid or base functional groups (carboxylic acid, phenolic hydroxyl, or amino groups) in controlled amounts (0.1-10 mmol/g). This parameter change allows the adhesive to form protective chemical interactions with metal surfaces while maintaining bonding strength and preventing corrosion.
Solution Approach 2:
The invention creates a composite adhesive system combining organic polymer matrices with specific functional groups that provide both adhesive properties and corrosion protection. The composite nature allows simultaneous achievement of bonding strength and metal protection through the synergistic effect of the polymer structure and functional groups.
2Strength
If existing optical adhesives provide bonding, then substrate attachment is achieved, but optical clarity deteriorates over time
Solution Approach 1:
The invention optimizes the molecular weight parameters of the polymer (10,000-1,000,000 g/mol) and controls the concentration of functional groups to achieve the right balance between bonding strength and optical clarity. The parameter optimization ensures the adhesive remains transparent while providing adequate bonding capability.
3Ease of manufacture
If existing adhesives are used for LCD assembly, then manufacturing process is simplified, but durability under use conditions deteriorates
Solution Approach 1:
The invention adjusts the glass transition temperature (Tg) parameter of the polymer to specific ranges that provide both ease of application during manufacturing and long-term durability under display operating conditions. The Tg optimization allows the adhesive to remain workable during assembly while maintaining stability during use.
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 ensures adequate bonding without corroding metal components, maintains optical clarity, and offers stability and durability under normal use conditions, supporting the manufacturing of reliable and efficient LCDs using conventional equipment and materials.
Implementation Method 1
the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed
Implementation Method 2
The adhesive may be optically transmissive, e.g., optically clear and may maintain such properties for a useful period of time under normal use conditions
Implementation Method 3
the adhesive that provides adequate bonding yet is not corrosive towards components in the display, typically metal components
Data Source
AI summary
A liquid crystal display includes first and second opposing substrates having first and second opposing surfaces, respectively, at least one of the surfaces having a metal disposed thereon, the substrates bonded together with an adhesive in contact with the metal, the adhesive comprising a blend of: a pressure sensitive adhesive component comprising at least one polymer having acid or base functionality, a high Tg polymer having a weight average molecular weight greater than 100,000 and having an acid or base functionality, and a crosslinker, wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed.