Polymerizable Liquid Crystal Compounds for Residue-Free PSVA Alignment
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Solution Overview
Problem
Existing liquid crystal compositions for PSVA displays face challenges such as unsuitable soluble RMs, sensitivity to short UV wavelengths, insufficient tilt angle formation, and poor uniformity of polymerizable components, leading to issues like image sticking and low voltage holding ratio.
Innovation Solution
Development of novel polymerizable compounds with specific structural formulas, such as BYLC-01 to BYLC-12, which exhibit improved solubility, alignment, and polymerization properties, including a mass percentage of 0.01-10% in liquid crystal compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymerizable compounds are used in PSVA displays, then the liquid crystal composition can be formulated, but the polymerization is incomplete and residues remain, leading to image sticking
Solution Approach 1:
The patent modifies the molecular structure of polymerizable compounds by introducing specific functional groups (cyclic carbonate, carbonyl, ether, ester groups) and adjusting molecular weight parameters. These parameter changes enable complete polymerization without residues while maintaining solubility and alignment properties, thereby eliminating image sticking issues.
Solution Approach 2:
The patent creates composite liquid crystal compositions by combining specially designed polymerizable compounds with liquid crystal hosts. The composite structure ensures compatible interactions between components, achieving complete polymerization, proper alignment, and no residues, thus resolving the contradiction between reliability and substance loss.
2Manufacturing precision
If polymerizable compounds sensitive to short UV wavelengths are used, then polymerization can be initiated, but the tilt angle formation is insufficient and uniformity is poor
Solution Approach 1:
The patent adjusts the energy parameters of polymerizable compounds by incorporating specific functional groups that absorb UV energy more efficiently and uniformly. This enables tilt angle formation with better uniformity while using appropriate UV wavelengths, resolving the contradiction between manufacturing precision and energy usage.
3Reliability
If the liquid crystal composition is formulated with existing polymerizable components, then the composition can be prepared, but the voltage holding ratio is low due to excessive rotational viscosity
Solution Approach 1:
The patent optimizes the molecular weight and structural parameters of polymerizable compounds to achieve the right balance. The modified compounds have lower rotational viscosity while maintaining necessary stability, resulting in higher voltage holding ratio after polymerization. This resolves the contradiction between reliability and composition stability.
4Speed
If conventional liquid crystal compositions are used, then the display can operate, but the response time is slow and residual image level is poor
Solution Approach 1:
The patent modifies parameters of the liquid crystal composition by incorporating polymerizable compounds with specific molecular structures that reduce rotational viscosity. This enables faster response time while the complete polymerization prevents residues that cause residual images, thus resolving the contradiction between speed and reliability.
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 novel compounds enhance polymerization completeness, reduce residues, and improve display quality by ensuring better alignment and faster response times, thereby addressing the limitations of prior art.
Implementation Method 1
the range of choices becomes even smaller; additionally, the 'material system' formed by combining the LC mixture (hereinafter also referred to as 'LC host mixture') with a selected polymerizable component
Data Source
AI summary
The present disclosure belongs to the technical field of liquid crystal materials, and particularly relates to a polymerizable compound and the use thereof. The polymerizable compound of the present disclosure has a structure as shown in general formula I. Compared with the prior art, the polymerizable compound of the present disclosure has good solubility, a better alignment effect, a higher polymerization rate, more complete polymerization, and lower residue, thereby greatly improving the problem of poor display; a liquid crystal composition containing the polymerizable compound has a better alignment effect, more complete polymerization, and lower residue; and the polymerizable compound has a low price and stable performance, can be widely applied to the field of liquid crystal display, and has an important application value.