Polymer Stabilized Vertical Alignment Liquid Crystal Composition
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Solution Overview
Problem
Current liquid crystal compositions for polymer stabilized vertical alignment (PSVA) mode lack sufficient negative dielectric anisotropy and are prone to unexpected polymerization, which affects the alignment and stability of liquid crystals, particularly during manufacturing, storage, and use.
Innovation Solution
A liquid crystal composition with a specific formulation including compounds of general formulas (I), (II), and (IV), along with a polymerizable compound, is used to achieve negative dielectric anisotropy and stability, utilizing radical polymerization for rapid curing without contamination and incorporating a stabilizer to control polymerization, thereby preventing unexpected polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a polymerizable compound is added to control liquid crystal alignment in PSVA mode, then alignment stability is improved, but unexpected polymerization occurs during manufacture, storage and transportation
Solution Approach 1:
The patent extracts the harmful polymerization reaction from the system by removing the polymerizable compound's vulnerability through careful molecular structure design. The liquid crystal compounds are designed to resist polymerization while maintaining alignment control, effectively separating the desired alignment function from the harmful polymerization side effect.
Solution Approach 2:
The patent changes the chemical parameters of the liquid crystal system by selecting specific compounds with carefully controlled molecular structures, transition temperatures, and reactivity parameters. This allows the system to maintain polymerizable compound functionality for alignment while operating below the threshold for unwanted polymerization during storage and handling.
2Use of energy by moving object
If the absolute value of dielectric anisotropy is increased to reduce drive voltage, then energy consumption is reduced, but liquid crystal composition becomes more difficult to stabilize against polymerization
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including dielectric anisotropy, molecular structure, and chemical reactivity. By changing these parameters in a coordinated manner, the system achieves high dielectric anisotropy for low energy consumption while maintaining composition stability through careful selection of compounds with appropriate reactivity thresholds.
Solution Approach 2:
The patent uses composite liquid crystal compositions containing multiple compounds with complementary properties. The combination of different liquid crystal compounds and polymerizable compounds creates a synergistic system where the overall dielectric anisotropy is enhanced while the polymerization stability is maintained through the collective properties of the mixture.
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 provides improved stability, higher dielectric anisotropy, and enhanced mechanical strength, ensuring reliable operation across a wider temperature range and reducing the risk of polymerization-related issues during manufacturing, storage, and use.
Implementation Method 1
performing UV exposure while maintaining at this state to polymerize the polymerizable compound in the mixed liquid crystal
Implementation Method 2
a negative liquid crystal is used as liquid crystal molecule in a liquid crystal layer, and transparent electrodes are disposed on upper and lower substrates to create an electric field perpendicular to the substrates
Data Source
AI summary
Provided are a stable alignment type liquid crystal composition and use thereof. The liquid crystal composition has negative dielectric anisotropy, better stability and a large absolute value of dielectric anisotropy. The liquid crystal composition comprises a compound of general formula (I) accounting for 10%-80% of the total weight of the liquid crystal composition, a compound of general formula (II) accounting for 0.0005%-0.5% of the total weight of the liquid crystal composition, a compound of general formula (IV) accounting for 15%-90% of the total weight of the liquid crystal composition, and a polymerizable compound accounting for 0.1%-5% of the total weight of the liquid crystal composition. The liquid crystal composition is less subject to interference of such factors as radicals, oxygen, heat or the like. Also provided is the use of the liquid crystal composition in a liquid crystal display device.