Curable Composition for Direct Bonding of Optical Members
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The air gap between display panels and touch panels in display devices causes light scattering, reducing contrast and inhibiting panel slimming, and existing solutions for filling this gap with optically clear resin lack comprehensive research on the correlations between physical properties such as dielectric constant, gel fraction, shrinkage rate, and storage modulus.
Innovation Solution
A curable composition is developed that adjusts the correlations between dielectric constant, gel fraction, shrinkage rate, and storage modulus by varying the content ratio of components like active energy ray curable oligomers and rubber components, ensuring a cured product with low permittivity and excellent adhesive properties, as expressed by the formula A×B×CD×1000≥30, where A is the dielectric constant, B is the gel fraction, C is the shrinkage rate, and D is the storage modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air gap is formed between the display panel and touch panel using a spacer, then the display panel is protected, but light scattering occurs and contrast is reduced
Solution Approach 1:
The patent changes the physical state of the gap-filling material from air (in air gap structure) to a cured resin composition. This parameter change eliminates light scattering while maintaining the protective function, as the cured resin has optical properties matched to the display panel and touch panel.
Solution Approach 2:
The patent introduces a resin composition as an intermediary material to replace the air gap. This intermediary material serves dual functions: maintaining the protective spacing between panels while eliminating light scattering issues associated with air gaps.
2Reliability
If an air gap is formed between the display panel and touch panel, then the display panel is protected, but panel slimming is inhibited
Solution Approach 1:
The patent changes the volume characteristics of the gap-filling material by using a curable resin composition that shrinks during curing. The liquid resin fills the gap in a thin state, and upon curing, maintains adequate protection while enabling panel slimming due to its shrinkage behavior.
3Strength
If the dielectric constant of the cured product is reduced, then adhesive property improves, but gel fraction and storage modulus must be optimized to maintain structural integrity
Solution Approach 1:
The patent systematically adjusts multiple parameters of the resin composition including dielectric constant, gel fraction, shrinkage rate, and storage modulus. By optimizing these parameters together rather than individually, the patent achieves both low dielectric constant for improved adhesive property and appropriate structural integrity for protecting the display panel.
Solution Approach 2:
The patent uses a composite resin composition containing specific components (acrylate oligomers, monomers, and additives) to achieve the desired balance between dielectric constant, gel fraction, and storage modulus. This composite approach allows simultaneous optimization of adhesive properties and structural integrity.
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 curable composition forms a cured product with low permittivity and excellent adhesive properties, suitable for adhesion in display devices, preventing size changes and ensuring strong bonding between optical members, while maintaining translucency and durability.
Implementation Method 1
active energy ray curable oligomers
Data Source
AI summary
The present application relates to a curable composition, a cured product and use of the curable composition and cured product. An exemplary curable composition may form a cured product having low permittivity and an excellent adhesive property, and thus may be usefully used for direct bonding of a variety of optical functional members of display devices, for example, direct bonding of a touch panel and a display panel.