Phase Difference Film Self-Alignment via High Surface Energy Support
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Solution Overview
Problem
The existing methods for manufacturing phase difference films require complex alignment treatment procedures due to varying alignment conditions, making it challenging to achieve excellent alignment without strict management of treatment conditions.
Innovation Solution
A phase difference film is developed using a support with a surface energy of 45 mN/m or more and a non-polar dispersion force component of 45 mN/m or more, where the liquid crystalline compound is immobilized in an aligned state, and the liquid crystal layer exhibits smectic properties, eliminating the need for alignment treatment on the support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment treatment is performed on the support to improve liquid crystal alignment, then the alignment quality improves, but the manufacturing procedure becomes complicated and requires strict management of treatment conditions
Solution Approach 1:
The support surface automatically provides alignment function through its inherent surface energy characteristics (45 mN/m or more with non-polar dispersion force component of 45 mN/m or more), eliminating the need for external alignment treatment processes. The liquid crystal composition self-organizes into aligned state upon contact with the support surface, making the system self-aligning without requiring additional treatment steps or strict condition management.
Solution Approach 2:
The invention changes the surface energy parameters of the support to achieve alignment functionality. By specifying that the support has a surface energy of 45 mN/m or more with a non-polar dispersion force component of 45 mN/m or more, the support inherently provides the alignment effect previously requiring complex treatment processes, thus resolving the contradiction between alignment quality and manufacturing complexity.
2Manufacturing precision
If alignment treatment conditions are strictly managed to achieve excellent alignment, then the alignment quality improves, but the manufacturing process becomes more complex
Solution Approach 1:
The support surface with specific surface energy characteristics (≥45 mN/m total, with non-polar dispersion force component ≥45 mN/m) inherently provides alignment functionality, making the system self-aligning. This eliminates the need for strict management of external treatment conditions, as the alignment occurs automatically when the liquid crystal composition contacts the support surface.
Solution Approach 2:
The invention extracts and utilizes the alignment function from the liquid crystal composition itself by designing the support surface energy characteristics to induce self-alignment. This removes the dependency on external alignment treatment processes and their associated condition management requirements, simplifying the manufacturing process while maintaining excellent alignment quality.
3Manufacturing precision
If a support with high surface energy and non-polar dispersion force component is used, then excellent alignment is achieved without alignment treatment, but the material selection becomes more restricted
Solution Approach 1:
The invention specifies quantitative parameters for support surface energy (≥45 mN/m total with non-polar dispersion force component ≥45 mN/m) that can be achieved by various materials including polycarbonate, cycloolefin resins, and other polymers. This parameter-based specification provides clear guidance for material selection while maintaining flexibility in choosing from multiple materials that can meet these surface energy requirements.
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 approach results in a phase difference film with excellent alignment and high contrast, simplifying the manufacturing process by eliminating the need for strict alignment treatment conditions, while maintaining good adhesiveness between the support and the liquid crystal layer.
Implementation Method 1
a surface energy of a surface of the support on which the liquid crystal layer is formed is 45 mN/m or more and a non-polar dispersion force component included in the surface energy is 45 mN/m or more
Implementation Method 2
a non-polar dispersion force component included in the surface energy is 45 mN/m or more
Implementation Method 3
the liquid crystal layer exhibits smectic properties
Data Source
AI summary
An object of the present invention is to provide a phase difference film having excellent alignment without the need for alignment treatment on a support, a method for manufacturing a phase difference film, a polarizing plate, and a liquid crystal display device. The phase difference film of the present invention includes a support, and a liquid crystal layer formed of a liquid crystal composition containing a liquid crystalline compound so as to be in contact with the support, in which a surface energy of a surface of the support on which the liquid crystal layer is formed is 45 mN/m or more and a non-polar dispersion force component included in the surface energy is 45 mN/m or more, the liquid crystalline compound is immobilized in an aligned state, and a contrast is more than 10000.