Wavelength-Selective Filter Adhesion for Direct Display Integration
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Solution Overview
Problem
Existing wavelength selective absorption filters face issues with low adhesiveness between the substrate film and the filter layer, requiring a transfer step that decreases manufacturing efficiency in display devices.
Innovation Solution
Incorporating a resin containing a carboxy group in the wavelength selective absorption filter layer, specifically using a squaraine-based coloring agent with a main absorption wavelength band of 460 to 520 nm, enhances adhesiveness between the substrate film and the filter layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wavelength selective absorption filter is used, then the filter can block unnecessary wavelengths, but the adhesiveness between the substrate film and filter layer is low requiring a transfer step
Solution Approach 1:
The patent changes the chemical composition parameters of the filter layer by incorporating a resin containing a carboxy group and a squaraine-based coloring agent. This chemical parameter change enhances the adhesiveness between the substrate film and filter layer, eliminating the need for a transfer step and improving manufacturing efficiency.
Solution Approach 2:
The patent creates a composite filter layer material combining a resin containing a carboxy group with a squaraine-based coloring agent. This composite material structure provides both the wavelength selective absorption function and enhanced adhesiveness to the substrate film, resolving the contradiction between reliability and productivity.
2Reliability
If a transfer step is used to improve adhesiveness, then the filter layer can be properly attached to the substrate, but the manufacturing process becomes more complex and less efficient
Solution Approach 1:
The patent merges the filter layer formation and substrate attachment functions into a single integrated layer. By incorporating the carboxy group-containing resin and squaraine-based coloring agent together in one coating step, the patent eliminates the need for separate transfer operations, reducing manufacturing process complexity while maintaining reliable adhesiveness.
3Ease of manufacture
If the filter layer is directly coated on the substrate, then manufacturing is simpler, but the adhesiveness is insufficient causing potential delamination
Solution Approach 1:
The patent modifies the chemical parameters of the coating material by introducing a resin with a carboxy group and a squaraine-based coloring agent. This parameter change enables direct coating with sufficient adhesiveness, maintaining manufacturing simplicity while preventing delamination and ensuring reliable attachment.
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 improved adhesiveness allows for direct incorporation of the filter into display devices without a transfer step, enhancing manufacturing efficiency and maintaining filter performance.
Implementation Method 1
a coloring agent having a main absorption wavelength band in a wavelength range of 460 to 520 nm
Implementation Method 2
the wavelength selective absorption filter layer contains a resin containing a carboxy group
Data Source
AI summary
A wavelength selective absorption filter including a substrate film and a wavelength selective absorption filter layer disposed in contact with the substrate film, in which the wavelength selective absorption filter layer contains a resin containing a carboxy group, and 0.1 parts by mass or more of a coloring agent having a main absorption wavelength band in a wavelength range of 460 to 520 nm with respect to 100 parts by mass of the resin; and a liquid crystal display device and an organic electroluminescent display device, including the filter.