Polymerizable Compound for Liquid Crystal Display Response Time
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Solution Overview
Problem
Current polymerizable compounds used in liquid crystal display devices face challenges in achieving a balance between solubility and polymerization reactivity, with high solubility often leading to decreased reactivity, and vice versa, which affects the device's performance in terms of response time, image burn-in, and operational range.
Innovation Solution
Development of a polymerizable compound represented by specific formulas (1-1), (1-2), (1-5), and (1-6) that offers high solubility and polymerization reactivity, along with a liquid crystal composition that includes these compounds, optimizing physical properties such as maximum and minimum temperatures, viscosity, optical anisotropy, dielectric anisotropy, and elastic constants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solubility of polymerizable compound in liquid crystal composition is increased, then the compound dissolves better, but the polymerization reactivity is decreased
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable compound by introducing specific molecular groups and adjusting the balance between polar and non-polar regions. This allows the compound to achieve both high solubility in liquid crystal composition and maintained polymerization reactivity through optimized molecular design rather than simple concentration changes
Solution Approach 2:
The patent creates a composite molecular structure combining liquid crystalogenic groups with polymerizable groups in a specific configuration. This composite structure enables the compound to function both as a liquid crystal component (providing solubility) and as a polymerizable unit (providing reactivity), resolving the contradiction between these two properties
2Speed
If the polymerization reactivity is increased to decrease response time, then the response time is shortened, but the solubility in liquid crystal composition is decreased
Solution Approach 1:
The patent optimizes the molecular parameters of the polymerizable compound to achieve rapid polymerization without sacrificing solubility. By adjusting the steric hindrance, electronic effects, and molecular size parameters, the compound attains high reactivity while maintaining compatibility with the liquid crystal composition
3Reliability
If the polymer is formed by irradiation with ultraviolet light to improve image burn-in, then the image burn-in is improved, but the solubility and polymerization reactivity balance is compromised
Solution Approach 1:
The patent introduces a specially designed polymerizable compound that acts as an intermediary between the liquid crystal molecules and the UV irradiation process. This compound absorbs UV energy efficiently to initiate polymerization (improving image burn-in resistance) while its molecular structure ensures it remains soluble in the liquid crystal composition and maintains appropriate polymerization reactivity
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 compound and composition provide a liquid crystal display device with improved solubility, polymerization efficiency, and balanced physical properties, resulting in a wide temperature range, short response time, high voltage holding ratio, low threshold voltage, and long service life.
Implementation Method 1
a polymer is formed in the liquid crystal composition by the irradiation with ultraviolet light under the conditions of applied voltage between electrodes and by the polymerization of the polymerizable compound
Implementation Method 2
A liquid crystal display device utilizes optical anisotropy, dielectric anisotropy and so forth of liquid crystal molecules
Implementation Method 3
A liquid crystal display device utilizes optical anisotropy, dielectric anisotropy and so forth of liquid crystal molecules
Data Source
AI summary
The subject is to provide a polymerizable compound having a suitable polymerization reactivity, a high conversion yield and a high solubility in a liquid crystal composition. The subject is to provide a liquid crystal composition having physical properties such as a high maximum temperature of a nematic phase, a low minimum temperature of a nematic phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant, a large specific resistance and a suitable pretilt. The subject is to provide a liquid crystal display device containing the composition and having a wide temperature range in which the device can be used, a short response time, a large voltage holding ratio, a low threshold voltage, a large contrast ratio and a long service life.