Polymerizable Compound for PSA Liquid Crystal Displays
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Solution Overview
Problem
Current liquid crystal compositions for PSA displays face issues such as unsuitable polymerizable components, high rotary viscosity, and low voltage holding ratio, leading to residual images and uneven display performance.
Innovation Solution
A polymerizable compound with a specific structural formula is combined with specific liquid crystal components to form a composition that enhances polymerization rate, reduces rotary viscosity, and improves photoelectric properties, resulting in a high voltage holding ratio and reduced residual images.
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 rotary viscosity remains high and voltage holding ratio is low, leading to residual images
Solution Approach 1:
The patent modifies the molecular structure of polymerizable components by introducing specific groups (cyano, fluorine, alkoxy) and adjusting molecular weight and polarity parameters. These parameter changes optimize the liquid crystal composition to achieve faster polymerization rates, reduced rotary viscosity, and improved voltage holding ratio, thereby eliminating residual images while maintaining display performance
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple components with specific functions: polymerizable components (for alignment and stability), liquid crystal hosts (for display properties), and additives (for performance optimization). This composite approach synergistically improves voltage holding ratio and eliminates residual images while maintaining fast response times
2Speed
If the polymerization rate is increased to improve response time, then faster response is achieved, but display uniformity may be compromised
Solution Approach 1:
The patent optimizes polymerization kinetics by adjusting parameters such as monomer concentration, molecular weight, and functional group composition. These changes enable faster polymerization rates that improve response time while maintaining uniform polymer network formation, thus preserving display uniformity without sacrificing speed
Solution Approach 2:
The patent introduces specific liquid crystal host components and additives that act as intermediaries to mediate between the polymerizable monomers and the final polymer network. These intermediaries facilitate uniform polymerization throughout the liquid crystal composition, ensuring both fast response times and uniform display performance
3Reliability
If standard liquid crystal components are used, then the display can function, but the photoelectric properties and overall performance are insufficient
Solution Approach 1:
The patent develops a composite liquid crystal system combining specially designed polymerizable components with optimized liquid crystal hosts. This composite material achieves superior photoelectric properties including high contrast ratio, wide viewing angle, and fast response, while maintaining excellent manufacturing performance and scalability
Solution Approach 2:
The patent systematically optimizes key parameters of the liquid crystal components including dielectric anisotropy, optical anisotropy, clearing point, and viscosity. These parameter optimizations enhance photoelectric performance while ensuring the composition remains manufacturable and scalable for production
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 achieves faster response times, improved display uniformity, and higher voltage holding ratios, effectively addressing the limitations of existing liquid crystal compositions in PSA displays.
Implementation Method 1
The compound represented by formula I has a good intermiscibility with other monomers, a good ultraviolet resistance, and the like, and thus is very suitable for use as a reactive mesogen (RM) for PSA (polymer supported alignment) and PS (polymer stabilized) mode liquid crystal mixtures
Data Source
AI summary
Provided are a polymerizable compound represented by formula I and a liquid crystal composition formed by combining such a polymerizable compound 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; in particular, the polymerizable compound has a faster polymerization rate, and a “material system” formed from the selected polymerizable component and liquid crystal component has a low rotary viscosity and good photoelectric properties, and has a high VHR after (UV) photoradiation, this avoiding the problem of the occurrence of residual images to final displays.