Polymer-Stabilized Liquid Crystal Composition for PSVA Displays
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Solution Overview
Problem
Liquid crystal display technologies, particularly in PSVA mode, face challenges with uniformity of polymer films and alignment forces, leading to issues with residual images and response times, which affect display quality and viewing angles.
Innovation Solution
A polymer-stabilized liquid crystal composition is developed, incorporating specific polymerizable compounds and negative dielectric anisotropy liquid crystals, which improves the alignment force and uniformity of polymer films, enhancing the stability and performance of PSVA displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polymer films are formed from polymerization of polymerizable compounds to control multidomain and pretilt angle in PSVA displays, then viewing angle and response time are improved, but uniformity of polymer films and alignment force become insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of polymerizable compounds by introducing specific molecular weight ranges and functional group compositions. The polymerizable compounds have molecular weights of 100-500 g/mol with specific ratios of reactive groups, which controls polymerization kinetics and film formation uniformity while maintaining the desired multidomain alignment and pretilt angle properties for wide viewing angles and fast response times.
Solution Approach 2:
The patent uses composite liquid crystal compositions containing multiple components: polymerizable compounds (0.1-5 wt%), liquid crystal compounds with specific dielectric anisotropy, and additives. This composite approach allows the polymerizable compounds to form uniform polymer films that provide both structural uniformity and sufficient alignment force, while the liquid crystal components maintain the multidomain vertical alignment structure for improved viewing angle and response time.
2Speed
If polymer films are formed to realize multidomain control, then response time is improved, but alignment force becomes insufficient
Solution Approach 1:
The patent optimizes the molecular weight and functional group density of polymerizable compounds to control polymerization degree and crosslinking density. By adjusting these parameters, the polymer network achieves optimal balance between flexibility (for fast response time) and structural strength (for sufficient alignment force). The specific molecular weight range of 100-500 g/mol ensures rapid polymerization while forming a robust alignment structure.
3Adaptability or versatility
If conventional polymerizable compounds are used in PSVA mode, then multidomain control is achieved, but uniformity of polymer films deteriorates
Solution Approach 1:
The patent introduces specific parameter ranges for polymerizable compounds including molecular weight (100-500 g/mol), reactive group density, and functional group types. These parameter optimizations ensure uniform polymerization throughout the liquid crystal composition, forming polymer films with consistent properties that enable precise multidomain control while eliminating uniformity defects associated with conventional compounds.
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 achieves stable alignment forces and improved residual image performance, allowing for faster response times and wider viewing angles, addressing the limitations of existing PSVA technologies.
Implementation Method 1
the liquid crystal molecules are oriented by polymer films formed from the polymerization of polymerizable compounds
Implementation Method 2
a negative dielectric anisotropy liquid crystal composition, wherein the negative dielectric anisotropy liquid crystal composition has a dielectric anisotropy of Δε≤−1.5
Data Source
AI summary
Disclosed are a polymer-stabilized liquid crystal composition and the use thereof. The composition comprises one or two polymerizable compounds represented by general formula I: (I), and further comprises a negative dielectric anisotropy liquid crystal composition, wherein the negative dielectric anisotropy liquid crystal composition has a dielectric anisotropy of Δε≤−1.5; and the added amount of the polymerizable compound(s) represented by general formula I is 0.1-0.5% of the total mass of the negative dielectric anisotropy liquid crystal composition. A polymer film formed after the polymerization of the provided liquid crystal composition containing the polymerizable compound(s) has a very good uniformity, such that the problem of liquid crystal displays having poor display can be improved. Moreover, an alignment film formed after the polymerization of the polymerizable liquid crystal composition has an excellent alignment force, and can improve residual image problems caused by an insufficient alignment force in a PSVA liquid crystal display. The provided liquid crystal composition containing the polymerizable compound(s) can realize an adjustable response speed, and can in turn meet the requirements of different technical process conditions.