Optical Laminate Liquid Crystal Adhesion Moisture Resistance
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Solution Overview
Problem
Optical laminates with liquid crystal layers exhibiting reverse wavelength dispersibility face challenges in moisture-heat resistance and adhesiveness between layers, particularly when using photo-alignment polymers with fluorine or silicon atoms, leading to suboptimal performance in bonding to panels and maintaining alignment.
Innovation Solution
An optical laminate configuration where both the first and second optically anisotropic layers are directly laminated and consist of liquid crystal layers, with a photo-alignment polymer containing fluorine or silicon atoms present on the surface of the second layer, maintaining an element ratio of 0.05% to 15.00% by atom, enhancing moisture-heat resistance and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a photo-alignment polymer having a fluorine atom or a silicon atom is used to form an optically anisotropic layer, then the liquid crystal alignment is improved, but the moisture-heat resistance deteriorates
Solution Approach 1:
A silicon-containing compound is introduced as an intermediary substance between the photo-alignment polymer and the liquid crystal layer. This compound migrates to the surface during storage and forms a protective layer that prevents moisture penetration, thereby improving moisture-heat resistance without affecting the liquid crystal alignment properties provided by the photo-alignment polymer
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating specific silicon-containing compounds with controlled molecular structures and concentrations. By adjusting the type and amount of silicon compound, the system achieves both good liquid crystal alignment and improved moisture-heat resistance
2Manufacturing precision
If a photo-alignment polymer having a fluorine atom or a silicon atom is used to form an optically anisotropic layer, then the liquid crystal alignment is improved, but the adhesiveness between layers deteriorates
Solution Approach 1:
The silicon-containing compound acts as a mediating substance that improves interfacial compatibility between the photo-alignment polymer layer and the liquid crystal layer. It enhances adhesion by forming a transition layer that is compatible with both materials, preventing delamination while preserving alignment quality
3Manufacturing precision
If an optically anisotropic layer exhibiting reverse wavelength dispersibility is bonded to a panel, then the optical performance is improved, but the moisture-heat resistance deteriorates
Solution Approach 1:
The silicon-containing compound serves as a protective intermediary that specifically addresses the moisture-heat resistance issue in optically anisotropic layers with reverse wavelength dispersibility. It forms a moisture-blocking layer that allows these specialized optical layers to maintain both their optical performance and environmental stability
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 proposed configuration significantly improves the moisture-heat resistance and adhesiveness between the optically anisotropic layers, ensuring better bonding and alignment, thereby enhancing the overall performance of the optical laminate in image display devices and polarizing plates.
Implementation Method 1
a photo-alignment film obtained by performing a photo-alignment treatment is used in some cases in order to align a liquid crystal compound
Implementation Method 2
by allowing a photo-alignment polymer to be present such that the element ratio of fluorine or silicon is a specific amount, the moisture-heat resistance of the optically anisotropic layers exhibiting reverse wavelength dispersibility is improved
Implementation Method 3
the adhesiveness between the first optically anisotropic layer and the second optically anisotropic layer is improved
Data Source
AI summary
An object of the present invention is to provide an optical laminate in which optically anisotropic layers exhibiting reverse wavelength dispersibility have excellent moisture-heat resistance, and the adhesiveness between a first optically anisotropic layer and a second optically anisotropic layer is excellent; and a polarizing plate and an image display device, each using the optical laminate. The optical laminate according to an embodiment of the present invention is an optical laminate having a first optically anisotropic layer and a second optically anisotropic layer, in which both of the first optically anisotropic layer and the second optically anisotropic layer are directly laminated and consist of a liquid crystal layer, at least one of the first optically anisotropic layer or the second optically anisotropic layer exhibits reverse wavelength dispersibility, a photo-alignment polymer having a photo-alignment group and a fluorine atom or a silicon atom is present on a surface of the second optically anisotropic layer on a side in contact with the first optically anisotropic layer, and an element ratio of fluorine or silicon on the surface of the second optically anisotropic layer on the side in contact with the first optically anisotropic layer is 0.05% to 15.00% by atom.