Blue Phase Liquid Crystal Medium Stabilization
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Solution Overview
Problem
Liquid crystal media used in displays operating in the blue phase face challenges such as high operating voltages, temperature-dependent voltage requirements, and moderate reliability, which limit their applicability due to narrow blue phase temperature ranges and inconvenient locations.
Innovation Solution
A mesogenic media comprising specific compounds of formulas I-M and I-U, combined in specific concentrations, stabilizes the blue phase over a wide temperature range, reducing operating voltage, temperature dependency, and improving voltage holding ratio, while maintaining low viscosity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal media are used in displays operating in the blue phase, then switching times are faster and viewing angles are wider, but operating voltages are high and temperature dependency is significant
Solution Approach 1:
The patent modifies the chemical composition parameters of the liquid crystal media by incorporating specific compounds (Formula I with R1=alkyl/alkoxy/fluorinated alkyl, L1=H/F, X1=F/CN/CF3, Y01/Y02=F/Cl/CN) to adjust the dielectric and optical properties, thereby reducing operating voltage and temperature dependency while maintaining fast switching characteristics
Solution Approach 2:
The patent creates composite liquid crystal media by combining multiple compounds including Formula I compounds, chiral compounds, and reactive mesogens in specific concentrations (Formula I compounds: 5-50 wt%, chiral compounds: 1-30 wt%, reactive mesogens: 5-30 wt%) to achieve synergistic effects that stabilize the blue phase across wide temperature ranges while reducing operating voltages
2Ease of manufacture
If blue phase liquid crystal displays are operated, then manufacturing is easier compared to smectic phase displays, but the blue phase temperature range is narrow and location is inconvenient
Solution Approach 1:
The patent adjusts the temperature parameters of the blue phase by incorporating compounds with specific molecular structures (Formula I with varying R1 groups including fluorinated alkyl chains) that broaden the blue phase temperature range from typically narrow ranges to spans exceeding 50°C, while maintaining ease of manufacture
Solution Approach 2:
The patent introduces chiral compounds and reactive mesogens as intermediary substances that stabilize the blue phase structure across wide temperature ranges, acting as mediators between the liquid crystal molecules to maintain phase stability without complicating the manufacturing process
3Stability of the object's composition
If conventional liquid crystal compounds are used, then the liquid crystal phase is stable, but the operating voltage is high and voltage holding ratio is moderate
Solution Approach 1:
The patent changes the dielectric parameters of the liquid crystal media by incorporating Formula I compounds with specific substituent patterns (X1=F/CN/CF3, Y01/Y02=F/Cl/CN) that enhance dielectric anisotropy and reduce operating voltage while improving voltage holding ratio beyond 90%
Data Source
AI summary
The instant invention relates to mesogenic media exhibiting a blue phase, comprising one or both components selected from the two following components, components A and B,component A, comprising one or more compounds selected from the group of compounds of formula I-M,and component B, consisting of one or more compounds selected from the group of compounds of formula I-U,wherein the parameters are as specified in the text, preferably stabilized by a polymer, and their use in electro-optical light modulation elements and their respective use in displays, as well as to such displays.