Polarizer Alignment via Thermotropic Liquid Crystal Composition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polarizers used in image display devices have limitations in achieving a high degree of alignment, which affects the performance and efficiency of these devices, particularly due to the use of iodine as a dichroic material and the need for different devices for various optical functions.
Innovation Solution
A polarizer formed with a composition containing a thermotropic liquid crystal and crystalline polymer, where the polymer liquid crystal compound and dichroic material are horizontally aligned, with specific crystallization temperatures and X-ray diffraction characteristics, enhancing the degree of alignment and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a polarizer uses iodine as a dichroic material with conventional polymer liquid crystal compounds, then the polarizer can achieve basic polarization function, but the degree of alignment is insufficient and performance is limited
Solution Approach 1:
The invention changes the chemical composition parameters of the polymer liquid crystal compound by incorporating specific mesogenic groups (biphenyl, terphenyl, or phenylcyclohexane structures) and controlling the ratio of rigid to flexible parts within 0.3 to 2.0. This parameter optimization enables the polymer liquid crystal to achieve superior alignment degree when combined with iodine dichroic material, resolving the contradiction between alignment precision and performance reliability
Solution Approach 2:
The invention creates a composite polarizer system combining specifically designed polymer liquid crystal compounds with iodine dichroic material. The composite formulation, where the polymer liquid crystal contains optimized mesogenic groups and controlled molecular flexibility, works synergistically with iodine to achieve high alignment degree and excellent polarization performance simultaneously
2Adaptability or versatility
If different devices are used for various optical functions (linear polarizer, circular polarizer, scattering function, light shielding), then each function can be optimized, but the device complexity and number of components increases
Solution Approach 1:
The invention creates a universal polarizer base material (polymer liquid crystal compound with specific mesogenic groups and controlled flexibility ratio) that can be adapted for multiple optical functions. By adjusting the composition and processing conditions of this versatile polymer liquid crystal, the same material system can serve as linear polarizer, circular polarizer, or provide scattering and light shielding functions, eliminating the need for separate specialized devices for each function
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 solution significantly improves the degree of alignment and performance of polarizers, leading to enhanced image display capabilities and reduced haze, while allowing for a single device to handle multiple optical functions.
Implementation Method 1
the polymer liquid crystal compound is a thermotropic liquid crystal and a crystalline polymer, and the polymer liquid crystal compound and the dichroic material are horizontally aligned
Implementation Method 2
the polymer liquid crystal compound and the dichroic material are horizontally aligned
Implementation Method 3
a crystallization temperature of the polymer liquid crystal compound is 120° C. or lower
Implementation Method 4
the crystallization temperature of the polarizer-forming composition is 100° C. or lower
Implementation Method 5
a peak A with a half-width less than 2° and a peak B with a half-width of 2° or greater are observed in an X-ray diffraction spectrum
Data Source
AI summary
Provided is a polarizer having a high degree of alignment and an image display device including the polarizer. The polarizer is formed of a polarizer-forming composition containing a polymer liquid crystal compound and a dichroic material, in which the polymer liquid crystal compound is a thermotropic liquid crystal and a crystalline polymer, and the polymer liquid crystal compound and the dichroic material are horizontally aligned.