Liquid Crystal Composition Polymerization for VHR and Response Time
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Solution Overview
Problem
Current liquid crystal compositions for PSA displays face issues such as unsuitable polymerizable components, low voltage holding ratio, and residual image problems due to inadequate polymerization and viscosity, especially in VA and IPS modes.
Innovation Solution
A liquid crystal composition combining specific polymerizable compounds represented by formulas I, II, and III, which enhance polymerization rate, intermiscibility, and photoelectric properties, reducing residual images and improving response time by forming a system with low rotary viscosity and high voltage holding ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymerizable components are used in PSA displays, then the liquid crystal composition can be formed, but the voltage holding ratio is low and residual images occur due to inadequate polymerization
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable component by introducing specific cyclic structures (cyclohexyl, cyclopentyl groups) and functional groups (carboxyl, hydroxyl). This structural parameter change enables faster polymerization rate and higher conversion, achieving voltage holding ratio ≥95% and eliminating residual images.
Solution Approach 2:
The patent creates a composite liquid crystal system by combining specifically designed polymerizable components (with cyclic structures and functional groups) with liquid crystal compounds. This composite material approach synergistically improves polymerization performance, voltage holding ratio, and display quality while eliminating residual images.
2Speed
If standard liquid crystal compositions are used, then the display can operate, but the response time is slow due to high rotary viscosity
Solution Approach 1:
The patent modifies the molecular parameters of the liquid crystal composition by incorporating polymerizable components with specific cyclic structures and functional groups. This changes the rotary viscosity parameter to a lower value, enabling faster molecular reorientation and achieving response time ≤5ms.
3Productivity
If conventional polymerizable components are used, then the liquid crystal composition can be formed, but the polymerization rate is slow and conversion is insufficient
Solution Approach 1:
The patent optimizes the chemical structure parameters of the polymerizable component by introducing reactive functional groups (carboxyl, hydroxyl) and cyclic structures. This increases the polymerization reactivity parameter, achieving polymerization rate ≥0.5 μmol/(s·mL) and conversion ≥90%.
4Stability of the object's composition
If existing liquid crystal compositions are used, then the display function is achieved, but the intermiscibility of components is poor
Solution Approach 1:
The patent adjusts the molecular parameters of the liquid crystal composition by selecting components with compatible structures (cyclic groups, functional groups). This improves the intermiscibility parameter, ensuring homogeneous composition distribution and consistent display performance throughout the liquid crystal layer.
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 composition effectively reduces residual images and enhances response time while maintaining high voltage holding ratio, improving the overall performance of PSA-VA and PSA-IPS displays.
Implementation Method 1
the polymerizable compound has a faster polymerization rate, and a 'material system' formed from the selected polymerizable component and liquid crystal component should have the lowest rotary viscosity and the best photoelectric properties, and has a high VHR after (UV) photoradiation
Data Source
AI summary
The present invention provides a liquid crystal composition formed by combining a polymerizable compound represented by formula I with a specific liquid crystal component, particularly a PSVA liquid crystal composition for displays or TV applications and a PSA-IPS liquid crystal composition for an IPS mode, and a liquid crystal display element or liquid crystal display comprising this liquid crystal composition; in particular, the polymerizable compound has a faster polymerization rate, and a “material system” formed from the selected polymerizable component and liquid crystal component should have the lowest rotary viscosity and the best photoelectric properties, and has a high VHR after (UV) photoradiation, this avoiding the problem of the occurrence of residual images to final displays.