LCD Sealant Diene Compound Alignment Layer Bonding
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Solution Overview
Problem
The adhesive force between the upper and lower substrates in LCD devices is reduced when the sealant contacts the alignment layers, making it difficult to reduce bezel widths while maintaining bonding strength, which is a challenge in designing LCD devices with smaller bezels to meet consumer demands.
Innovation Solution
A sealant is developed that includes a diene compound and an epoxy resin, which forms a chemical bond with the alignment layer using UV rays, enhancing the bonding force between the sealant and the alignment layer, and includes a COO bond formed by reacting with amic acid, allowing the sealant to contact the alignment layer without reducing the adhesive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sealant is formed to contact the alignment layers to reduce bezel width, then the display surface area is enlarged, but the adhesive force between the substrates is reduced
Solution Approach 1:
The sealant is designed with different functional regions: a first region containing diene compounds that chemically bond to alignment layers, and a second region containing epoxy resins that bond to substrates. This local differentiation allows the sealant to simultaneously contact alignment layers and maintain strong adhesive force through specialized bonding zones.
Solution Approach 2:
The sealant comprises a composite formulation combining diene compounds and epoxy resins. The diene compounds provide chemical bonding capability with alignment layers via UV irradiation, while epoxy resins provide strong adhesive bonding with substrates, creating a material that achieves both functions simultaneously.
2Area of stationary object
If the interval between the end of the substrate and the end of the alignment layer is reduced to reduce bezel width, then the display surface area is enlarged, but it becomes difficult to form the sealant without contacting the alignment layer
Solution Approach 1:
The sealant formulation incorporates diene compounds specifically in the region that contacts the alignment layer, enabling controlled chemical bonding only where needed. This allows the sealant to be formed in close proximity to alignment layers without unintended contact or bonding issues.
Solution Approach 2:
The invention changes the chemical composition parameters of the sealant by adding diene compounds that react with alignment layers under UV irradiation. This parameter change enables the sealant to be formed closer to alignment layers while maintaining processability and controlled bonding characteristics.
3Area of stationary object
If the sealant contacts the alignment layer to reduce bezel width, then the display surface area is enlarged, but the bonding force between the sealant and alignment layer is insufficient
Solution Approach 1:
The invention replaces mechanical adhesion with chemical bonding by incorporating diene compounds in the sealant that form covalent bonds with alignment layers through UV irradiation. This chemical bonding mechanism provides significantly stronger and more reliable attachment than mechanical interlocking alone.
Solution Approach 2:
The sealant uses a composite of diene compounds and epoxy resins, where diene compounds specifically bond to alignment layers through UV-induced polymerization, while epoxy resins provide additional bonding strength and adhesion to substrates, creating a multi-functional bonding system.
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
This solution enhances the adhesive force between the substrates, enabling a reduction in bezel width while maintaining strong bonding, thus satisfying the demand for thinner LCD devices with larger display surfaces.
Implementation Method 1
A sealant is developed that includes a diene compound and an epoxy resin, which forms a chemical bond with the alignment layer using UV rays
Implementation Method 2
includes a COO bond formed by reacting with amic acid, allowing the sealant to contact the alignment layer without reducing the adhesive force
Data Source
AI summary
Disclosed is a liquid crystal display (LCD) device. The LCD device includes a first substrate and a second substrate facing each other, a liquid crystal layer between the first substrate and the second substrate, an alignment layer on at least one of the first and second substrates for alignment of liquid crystals in the liquid crystal layer, and a sealant in an edge area of each of the first and second substrates to bond the first substrate to the second substrate, the sealant including a diene compound.