Sol-Gel Alignment Layer for Polarizing Element
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Solution Overview
Problem
Existing polarizing elements face challenges in production complexity, increased costs due to the hardness of inorganic alignment films, thermal expansion differences leading to cracks and haze, and separation issues with organic substrates.
Innovation Solution
A polarizing element with a sol-gel film alignment layer formed using a sol of inorganic oxide and alkoxysilane, allowing for simpler production steps, reduced haze due to controlled abrasion, and improved adhesion without excessive hardness, using a specific ratio of components to achieve suitable hardness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an inorganic alignment film is formed by vapor deposition, then the film exhibits sufficient hardness, but the production steps become complicated and production cost increases
Solution Approach 1:
The patent replaces the mechanical vapor deposition process with a chemical sol-gel process. The alignment film is formed by applying a sol-gel composition containing inorganic oxide precursors (such as silicon oxide, germanium oxide) that undergo chemical transformation upon heating to form a hard inorganic film, eliminating the need for complex vacuum deposition equipment and steps.
Solution Approach 2:
The patent changes the formation parameters from physical vapor deposition conditions to chemical sol-gel processing conditions. By controlling the composition of the sol-gel precursor solution and the heating treatment parameters (temperature, time), the film hardness and properties can be adjusted to match or exceed the performance of vapor-deposited films while simplifying the production process.
2Strength
If an inorganic alignment film is formed, then the film has sufficient hardness, but cracks are formed during heating treatment due to thermal expansion difference
Solution Approach 1:
The patent employs a composite structure consisting of an organic sol-gel film layer and an inorganic alignment film layer. The organic sol-gel composition contains inorganic oxide precursors that form a hard inorganic network within an organic matrix during heating. This composite structure allows the organic component to accommodate thermal expansion differences while the inorganic network provides hardness, preventing crack formation.
Solution Approach 2:
The sol-gel film forms a flexible intermediate layer between the substrate and the hard inorganic alignment film. This flexible layer can accommodate thermal stress and expansion differences during heating treatment, preventing the formation of cracks that would occur in purely rigid inorganic film structures.
3Strength
If a deposited inorganic substance film is used, then the film has great hardness, but marks of abrasion become great and haze appears when abrasion treatment is conducted excessively
Solution Approach 1:
The patent changes the physical and chemical parameters of the alignment film by using a sol-gel derived structure with controlled porosity and surface morphology. The film maintains sufficient hardness for durability but has a surface structure that allows gentle abrasion treatment to create alignment patterns without generating large marks or haze, improving the precision of the abrasion process.
4Ease of manufacture
If an organic primer layer is used, then the abrasion treatment is facilitated, but the polarizing layer tends to separate in later production steps
Solution Approach 1:
The patent uses a composite sol-gel film that combines organic and inorganic components in a single integrated structure. The organic sol-gel composition provides ease of abrasion treatment while the inorganic oxide network formed during heating provides strong adhesion and structural integrity, preventing layer separation in subsequent production steps while maintaining the benefits of organic material processing.
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 polarizing element is produced in simpler steps with reduced haze and improved adhesion, facilitating the alignment of dichroic coloring agents while preventing crack formation and substrate separation.
Implementation Method 1
a sol-gel film formed by using a material comprising at least (A) a sol of an inorganic oxide and (B) an alkoxysilane
Implementation Method 2
a sol-gel film formed by using a material comprising at least (A) a sol of an inorganic oxide and (B) an alkoxysilane
Implementation Method 3
a polarizing layer formed by aligning a dichroic coloring agent by deposition
Data Source
Figure 1(A)~1(E)
AI summary
A polarizing element comprising an alignment layer and a polarizing layer formed by aligning a dichroic coloring agent by deposition which are successively disposed on a substrate, wherein the alignment layer is a sol-gel film formed by using a material comprising at least (A) a sol of an inorganic oxide and (B) an alkoxysilane and/or a hexaalkoxydisiloxane, and the ratio of amounts by mole of Component (B) to solid components in Component (A) [(B)/(A)(solid components)] is 99.9/0.1 to 40/60; and a process for producing the polarizing element. The polarizing element can be produced in simple steps, the treatment of abrasion of the surface necessary for alignment of a dichroic coloring agent by deposition is facilitated, and haze due to formation of cracks is absent.