Polarizing Plate with Diffusion Preventing Layers
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Solution Overview
Problem
Coating-type optical films used in flat panel display devices suffer from deterioration in optical performance over time, particularly in polarizing performance, due to environmental factors, making it challenging to maintain their effectiveness.
Innovation Solution
A polarizing plate is designed with a diffusion preventing layer and a polarizing film comprising a polymer of polymerizable liquid crystal and dichroic coloring matter, where the diffusion preventing layers are thin (20 μm or less) and can include a water-soluble polymer, and the polymerizable liquid crystal is thermotropic, exhibiting a smectic phase for improved orientation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a coating-type optical film is used to reduce thickness, then the thickness of the display device is reduced, but the optical performance deteriorates over time due to environmental factors
Solution Approach 1:
The invention uses a composite structure consisting of a polarizing film containing polymerizable liquid crystal and dichroic coloring matter, combined with diffusion preventing layers. This composite material approach allows the thin film structure to maintain both reduced thickness and improved long-term optical stability by preventing degradation through the multifunctional layer combination.
Solution Approach 2:
The diffusion preventing layers act as intermediary components that protect the polarizing film from environmental degradation. These layers serve as a barrier between the sensitive optical materials and the external environment, preventing harmful interactions while maintaining the thin overall structure.
2Length of moving object
If the thickness of the polarizing plate is reduced, then the display device becomes thinner, but the durability and resistance to environmental degradation are compromised
Solution Approach 1:
The polarizing plate employs a composite structure with multiple functional layers including diffusion preventing layers and a polymerizable liquid crystal-based polarizing film. This composite design enables the thin plate to achieve both reduced thickness and enhanced durability through the synergistic properties of different materials working together.
Solution Approach 2:
The diffusion preventing layers provide beforehand protection against environmental degradation factors such as moisture and oxygen. By incorporating these protective layers from the beginning, the polarizing film is shielded from harmful interactions that would otherwise accelerate aging and performance deterioration over time.
3Reliability
If a diffusion preventing layer is added to prevent deterioration, then the optical performance stability is improved, but the thickness increases
Solution Approach 1:
The invention uses thin film diffusion preventing layers that provide effective protection against degradation while maintaining minimal thickness. These thin films achieve the necessary barrier function to prevent environmental damage without significantly increasing the overall thickness of the polarizing plate.
Solution Approach 2:
The patent optimizes the thickness parameters of the diffusion preventing layers to achieve the right balance between protection and thinness. By carefully controlling the thickness within specific ranges, the layers provide sufficient barrier properties to prevent deterioration while keeping the overall structure thin for modern display 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
The solution effectively suppresses the deterioration of optical performance and reduces the thickness of the polarizing plate, ensuring consistent display quality over time by preventing the transfer of dichroic coloring matter and maintaining orientation of the polymerizable liquid crystal.
Implementation Method 1
the polymerizable liquid crystal is a thermotropic liquid crystal compound exhibiting a smectic phase
Implementation Method 2
a polarizing film in which a dichroic coloring matter such as iodine is oriented and adsorbed on a polyvinyl alcohol-based resin film
Data Source
AI summary
An object of the present invention is to solve the problems which can be peculiarly generated in a coating-type optical film, and provide an optical film which hardly causes deterioration in optical performance with time, a display device equipped with the optical film, and a process for producing the optical film, and there is provided a polarizing plate having a diffusion preventing layer A having the thickness of 0.05 μm to 3 μm, a polarizing film comprising a polymer of a polymerizable liquid crystal and a dichroic coloring matter, and a diffusion preventing layer B having the thickness of 0.05 μm to 3 μm, in this order.