Polyimide Alignment Layer Composition for Display Adhesion
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Solution Overview
Problem
Display devices face challenges in achieving good adhesion between the sealant and alignment layer, leading to durability issues and increased bezel area in array substrates.
Innovation Solution
A composition for the alignment layer incorporating a polyimide-based compound with a polymerization initiator coupled to its side chain, along with a crosslinking agent, enhances adhesion and durability by tightly coupling with the sealant, reducing the bezel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alignment layer materials are used, then the alignment layer can be manufactured, but adhesion between the sealant and alignment layer is poor
Solution Approach 1:
The patent modifies the chemical composition parameters of the alignment layer by incorporating a polymerization initiator (such as photopolymerization initiator, peroxide, or silane) into the polyimide-based compound. This changes the chemical reactivity parameters to enable in-situ polymerization and crosslinking reactions with the sealant, transforming the adhesion interface from physical contact to chemical bonding.
Solution Approach 2:
The patent creates a composite alignment layer material combining polyimide-based compound with polymerization initiator and optionally crosslinking agent. This composite formulation enables the alignment layer to participate in chemical reactions with the sealant, forming a bonded interface rather than relying on conventional physical adhesion mechanisms.
2Reliability
If conventional alignment layer materials are used, then the alignment layer can be manufactured, but durability of the array substrate is reduced
Solution Approach 1:
The patent incorporates the polymerization initiator into the alignment layer material before assembly. This preliminary preparation ensures that when the sealant is applied and cured, the alignment layer is already equipped to undergo in-situ polymerization and crosslinking reactions, forming strong chemical bonds before the final assembly is completed.
Solution Approach 2:
The patent changes the chemical state parameters of the alignment layer by introducing polymerization initiators that remain dormant until activated by UV irradiation or thermal conditions during sealant curing. This parameter change enables the alignment layer to transition from a passive interface to an actively bonding interface, enhancing durability without complicating the manufacturing process.
3Area of stationary object
If conventional alignment layer materials are used, then the alignment layer can be manufactured, but the bezel area is increased
Solution Approach 1:
The patent modifies the chemical parameters of the alignment layer to enable in-situ polymerization and crosslinking reactions with the sealant. This chemical parameter change allows for stronger adhesion at the sealant-alignment layer interface, enabling the use of thinner sealant layers and reduced bezel area while maintaining or improving adhesion strength.
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 achieves good adhesion between the alignment layer and sealant, improving the durability of the array substrate and reducing the bezel area, thereby enhancing the overall performance and design of display devices.
Implementation Method 1
a composition for an alignment layer including a polyimide-based compound and a polymerization initiator coupled to a side chain of the polyimide-based compound
Implementation Method 2
The composition may further include a crosslinking agent
Data Source
AI summary
A composition for an alignment layer includes a polyimide-based compound including a polymerization initiator coupled to a side chain of the polyimide-based compound.