Polarizer Composition Using Dual Dichroic Materials for Durability
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Solution Overview
Problem
Existing polarizers used in image display devices suffer from durability issues due to the type of dichroic material employed, leading to a decrease in the degree of polarization over time.
Innovation Solution
A polarizer composition is developed that includes a polymer liquid crystal compound combined with a first and second dichroic material, where the absolute difference in log P values between the two dichroic materials is 1.0 or less, and the stabilization energy is 30 kcal/mol or less, enhancing compatibility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single type of dichroic material is used in the polarizer composition, then the manufacturing process is simple, but the durability and stability of polarization degree deteriorate over time
Solution Approach 1:
The patent employs a composite dichroic material system consisting of multiple dichroic dyes with different log P values (ranging from 0.5 to 3.0) combined with a polymer liquid crystal compound. This composite approach prevents precipitation and decomposition that occurs with single-dye systems, thereby improving durability and polarization stability while maintaining manufacturability through established coating processes.
Solution Approach 2:
The patent systematically varies the log P values of different dichroic materials within a specific range (0.5 to 3.0) to optimize compatibility and prevent phase separation. By controlling this critical parameter (log P difference) and the stabilization energy between dichroic materials, the invention achieves enhanced long-term stability without complicating the manufacturing process.
2Illumination intensity
If dichroic materials with large difference in log P values are used, then the color performance can be enhanced, but the compatibility and stability of the composition deteriorate
Solution Approach 1:
The patent optimizes the log P values of dichroic materials within a balanced range (0.5 to 3.0), avoiding both too-small differences that limit color performance and too-large differences that cause precipitation. This parameter optimization ensures both excellent color characteristics and long-term compositional stability.
Solution Approach 2:
The patent assigns specific log P value ranges to different dichroic materials based on their functional roles in the composition. By locally optimizing the properties of each dichroic component within the overall system, the invention achieves both superior color performance and enhanced compatibility.
3Reliability
If iodine is used as the dichroic material, then the polarization function is effective, but the durability and resistance to decomposition deteriorate
Solution Approach 1:
The patent replaces iodine with organic dichroic dyes having optimized log P values (0.5 to 3.0) that provide equivalent or superior polarization functionality while demonstrating enhanced durability and resistance to decomposition under various environmental conditions including moisture and temperature variations.
Solution Approach 2:
The patent combines multiple stable organic dichroic dyes with a polymer liquid crystal compound to create a composite system that maintains effective polarization function while eliminating the durability issues associated with iodine-based polarizers.
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 polarizer exhibits excellent durability by suppressing the precipitation and decomposition of dichroic materials, maintaining the degree of polarization over time even in harsh environments.
Implementation Method 1
a linear polarizer or a circular polarizer is used in an image display device (for example, a liquid crystal display device) to control optical rotation or birefringence in display
Implementation Method 2
a linear polarizer or a circular polarizer is used in an image display device (for example, a liquid crystal display device) to control optical rotation or birefringence in display
Implementation Method 3
iodine has been widely used as a dichroic material in these polarizers, but a polarizer that uses an organic dye in place of iodine as a dichroic material has also been examined
Data Source
AI summary
Provided is a polarizer with excellent durability and an image display device including the polarizer. The polarizer includes a composition for forming a polarizer which contains a polymer liquid crystal compound and a dichroic material, in which the dichroic material includes a first dichroic material and a second dichroic material, an absolute value of a difference between a log P value of the first dichroic material and a log P value of the second dichroic material is 1.0 or less, and a stabilization energy indicating an energy loss in a case where one dichroic material of the first dichroic material and the second dichroic material is incorporated into a structure singly formed of the other dichroic material that is aligned therein is 30 kcal/mol or less.