Alignment Film Peeling Force Control for Optical Films
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Solution Overview
Problem
Existing optical films with a base material, alignment film, and liquid crystal layer face challenges in easily peeling off the base material while maintaining sufficient adhesiveness between the base material and alignment film during other operations.
Innovation Solution
Incorporating an alignment film with a specific compound, such as a polymerizable macromolecule or its polymer, unevenly distributed on the base material side, to adjust the peeling force and ensure adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the alignment film is made with conventional materials and coating methods, then the adhesiveness between the base material and alignment film is sufficient during manufacturing processes, but the peeling force becomes too high making base material removal difficult
Solution Approach 1:
The alignment film is designed with non-uniform composition distribution, specifically concentrating the polymerizable macromolecule (having polymerizable groups in side chains) at the interface region closest to the base material (within 100 nm from the base material surface). This local concentration creates a gradient structure where the region adjacent to the base material has different adhesive properties than the bulk alignment film, enabling controlled peeling while maintaining manufacturing adhesiveness
Solution Approach 2:
The invention changes the chemical composition parameters of the alignment film by incorporating polymerizable macromolecules with specific functional groups (carboxyl, hydroxyl, amino, or isocyanate groups) that can form strong interfacial bonds with the base material. The polymerization degree and molecular weight of these macromolecules are controlled to achieve optimal peeling characteristics, transforming the alignment film's adhesive properties from uniform to controllable and可调
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 allows for easy peeling of the base material while maintaining adequate adhesiveness during other processes, optimizing the peeling force to a range of 0.03 to 0.40 N/25 mm.
Implementation Method 1
adhesiveness between the base material and an alignment film can be sufficiently ensured
Data Source
AI summary
An optical film, including a polarizing plate, and an image display device. The optical film includes, in the following order, a base material, an alignment film, and a liquid crystal layer, in which the alignment film contains at least one specific compound selected from the group consisting of a polymerizable macromolecule having a polymerizable group in a side chain and a polymer thereof, and a secondary ion intensity derived from the specific compound in the alignment film is measured by a time-of-flight secondary ion mass spectrometry while irradiating the alignment film with an ion beam from a surface on a liquid crystal layer side toward a surface on abase material side, a maximum value of the secondary ion intensity derived from the specific compound is present in a region from the surface of the base material to a 100 nm thickness position.