Cyclopentene Liquid Crystals for Low Threshold Voltage
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Solution Overview
Problem
There is a need for liquid crystal displays with improved performance, specifically those having low threshold voltage, which is inversely proportional to the dielectric anisotropy of the mixture, to simplify electronics and enable space and weight savings.
Innovation Solution
The development of liquid crystal compounds and mixtures incorporating terminal cyclopentene groups with additional ring structures, allowing for positive or negative dielectric constants, which can be used to create mixtures with desired dielectric properties, such as positive dielectric constants of at least 8 or negative dielectric constants of -2 or less, to reduce threshold voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid crystal mixtures with large dielectric constant are used to reduce threshold voltage, then threshold voltage is improved, but device complexity increases due to the need for specific compound structures
Solution Approach 1:
The patent applies parameter changes by systematically varying the dielectric constant of liquid crystal compounds through structural modifications. Specific compounds with dielectric constants of at least 8 are designed by adjusting molecular structures, including the use of terminal cyclopentene groups and additional ring structures, to achieve the desired electrical properties while maintaining manageable structural complexity
Solution Approach 2:
The patent employs composite materials by creating liquid crystal mixtures that combine multiple compounds with different dielectric properties. These mixtures include compounds with positive dielectric constants (≥8) and compounds with negative dielectric constants (≤-2), allowing the overall mixture to achieve the required large dielectric constant for low threshold voltage operation
2Reliability
If liquid crystal compounds with specific ring structures are used to achieve positive dielectric constants of at least 8, then dielectric properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent achieves reliable dielectric properties by systematically modifying molecular parameters. Terminal cyclopentene groups and additional ring structures are incorporated into compound designs to ensure positive dielectric constants of at least 8. The structural variations are controlled through defined chemical groups and substitution patterns that can be synthesized using established organic chemistry methods
Solution Approach 2:
The patent applies local quality by introducing specific functional groups (terminal cyclopentene groups and additional ring structures) at particular positions within the molecular structure. These localized structural features are responsible for achieving the required positive dielectric constants, while the rest of the molecular framework can be optimized for other properties like thermal stability and viscosity
3Speed
If liquid crystal mixtures with large dielectric anisotropy are used to increase switching speed, then switching speed is improved, but the range of usable compounds is limited
Solution Approach 1:
The patent overcomes the limitation in compound selection by using composite liquid crystal mixtures. These mixtures combine compounds with positive dielectric constants (≥8) and compounds with negative dielectric constants (≤-2), providing a wide range of selectable components. This approach allows optimization of switching speed through dielectric anisotropy while maintaining versatility in compound selection and enabling fine-tuning of other mixture properties
Solution Approach 2:
The patent achieves universality by designing a platform of liquid crystal compounds with terminal cyclopentene groups and additional ring structures that can serve multiple functions. These compounds can be used individually or in combinations, and the same structural framework can be adapted to achieve different dielectric constants and other desired properties, expanding the range of usable compounds for various display applications
Data Source
AI summary
Provided are liquid crystal compounds and mixtures incorporating the same. The liquid crystal compounds of the invention generally comprise a terminal cyclopentene group, along with at least two other ring groups.