Polymer-Stabilized Blue Phase Liquid Crystal Medium
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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 variations, and moderate reliability, which limit their applicability due to narrow blue phase temperature ranges and stability issues.
Innovation Solution
Mesogenic media comprising specific compounds, such as those of formulas D, I, and their sub-formulae, which stabilize the blue phase over a wide temperature range, reducing operating voltage, temperature dependency, and improving voltage holding ratio, are developed by incorporating chiral compounds and reactive mesogenic materials to form a polymer-stabilized blue phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal media are used in blue phase displays, then switching times are faster and viewing angles are wider, but operating voltages are too high
Solution Approach 1:
The patent modifies the chemical composition parameters of the liquid crystal media by incorporating specific chiral compounds (formula D) and mesogenic compounds (formulas I, II, III, IV, V) with optimized molecular structures. This changes the physical parameters including viscosity and dielectric properties, enabling faster switching while reducing the operating voltage required
Solution Approach 2:
The patent creates composite liquid crystal media by combining multiple components: host mixtures with specific mesogenic compounds, chiral dopants (formula D), and additional mesogenic compounds (formulas I-V). This composite approach allows optimization of multiple properties simultaneously, achieving both fast switching and reduced operating voltage
2Speed
If liquid crystal media are used in blue phase displays, then switching performance is improved, but operating voltage varies dramatically with temperature
Solution Approach 1:
The patent optimizes the temperature-dependent parameters of the liquid crystal media by selecting compounds with specific thermal properties. The chiral compounds (formula D) and mesogenic compounds (formulas I-V) are chosen to maintain stable dielectric anisotropy and viscosity across a wide temperature range, thereby stabilizing operating voltage
Solution Approach 2:
The patent introduces compounds with specific local molecular characteristics that compensate for temperature effects. The chiral compounds (formula D) and mesogenic compounds (formulas I-V) have tailored molecular structures that maintain consistent intermolecular interactions across different temperatures, ensuring stable electro-optical performance
3Ease of manufacture
If conventional liquid crystal media are used, then manufacturing is simpler, but reliability is moderate with voltage holding ratio below 90%
Solution Approach 1:
The patent develops composite liquid crystal media combining host mixtures with specifically formulated chiral compounds (formula D) and mesogenic compounds (formulas I-V). This composite structure enhances reliability through synergistic effects while maintaining manufacturability, achieving voltage holding ratios above 90%
Solution Approach 2:
The patent modifies key parameters of the liquid crystal media including purity, molecular weight distribution, and compositional ratios to enhance reliability. The optimized composition achieves voltage holding ratios above 90% while maintaining compatibility with standard manufacturing processes
4Stability of the object's composition
If blue phase temperature range is narrow, then phase stability is achieved, but applicability is limited
Solution Approach 1:
The patent broadens the blue phase temperature range by adjusting the compositional parameters of the liquid crystal media. The specific combination of chiral compounds (formula D) and mesogenic compounds (formulas I-V) creates a eutectic-like effect that stabilizes the blue phase across an expanded temperature window, improving applicability
Solution Approach 2:
The patent creates composite media with multiple components that have complementary thermal properties. The host mixture combined with chiral compounds (formula D) and mesogenic compounds (formulas I-V) produces a blue phase that remains stable over a broader temperature range through synergistic interactions
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 a stable blue phase with reduced operating voltage, improved temperature stability, and enhanced reliability, enabling broader temperature range operation with lower voltage requirements and increased durability.
Implementation Method 1
incorporating chiral compounds and reactive mesogenic materials to form a polymer-stabilized blue phase
Implementation Method 2
electro-optical displays, and mesogenic light modulation media, which are in the optically isotropic blue phase, when being operated in the display
Data Source
AI summary
The instant invention relates to mesogenic media comprising one or more compounds of formula Dwherein the parameters are as specified in the text, preferably to mesogenic media showing a blue phase, preferably stabilised by a polymer, and their use in electro-optical light modulation elements and their respective use in displays, as well as to such devices.