Butene-Bonded Liquid Crystal Compound for Fast Response
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Solution Overview
Problem
Liquid crystal display devices, particularly those operating in IPS and VA modes, face challenges in improving response speed, contrast, and reducing driving voltage, with existing compounds failing to provide a suitable balance of physical properties such as chemical stability, high clearing point, low viscosity, large negative dielectric anisotropy, and excellent compatibility.
Innovation Solution
A 2,3-difluorobenzene derivative with a cyclohexene or phenyl ring and a butene-bonding group is developed, which forms a nematic phase over a wide temperature range, exhibits small viscosity, suitable optical anisotropy, and large elastic constant K33, and demonstrates excellent compatibility with other liquid crystal compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid crystal compounds are used in IPS and VA modes, then the device structure is simple and manufacturing is easy, but the response time is slow and contrast ratio is insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of liquid crystal compounds by introducing specific groups (difluorobenzene, cyclohexene, phenyl, butene-bonding) to optimize physical properties. This changes the compound's viscosity, elastic constant, and optical anisotropy parameters, thereby improving response time and contrast ratio while maintaining structural feasibility for manufacturing.
Solution Approach 2:
The invention creates composite liquid crystal compositions by combining multiple compounds with specific structural features (difluorobenzene derivative, cyclohexene ring, phenyl ring, butene-bonding group). This composite approach achieves synergistic effects that improve overall device performance including response time and contrast ratio beyond what single compounds can provide.
2Temperature
If liquid crystal compounds with high clearing point are used, then the temperature range for device operation is extended, but the viscosity increases and response time deteriorates
Solution Approach 1:
The patent carefully balances molecular structure parameters to achieve an optimal clearing point that extends operating temperature range while controlling viscosity. The specific structural modifications (difluorobenzene with cyclohexene or phenyl and butene-bonding group) are designed to raise the clearing point without excessively increasing viscosity, thus maintaining acceptable response time.
Solution Approach 2:
The invention introduces specific functional groups at particular positions in the molecular structure (2,3-difluorobenzene derivative with butene-bonding group) to locally enhance thermal stability and clearing point while minimizing the impact on overall molecular mobility and viscosity. This localized structural optimization allows temperature range extension without severe response time penalty.
3Use of energy by moving object
If liquid crystal compounds with large negative dielectric anisotropy are used, then the threshold voltage is reduced and power consumption decreases, but the optical anisotropy may become insufficient for desired contrast
Solution Approach 1:
The patent optimizes the molecular structure to achieve a balanced combination of dielectric anisotropy and optical anisotropy parameters. The difluorobenzene derivative with specific ring structures (cyclohexene or phenyl) and butene-bonding group is designed to provide sufficient negative dielectric anisotropy for low threshold voltage while maintaining adequate optical anisotropy for good contrast ratio, thus resolving the trade-off between power consumption and contrast.
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 compound enhances the stability, response time, contrast ratio, and reduces electric power consumption of liquid crystal display devices, enabling them to operate efficiently across a wide temperature range with improved voltage holding ratio and service life.
Implementation Method 1
The device utilizes optical anisotropy, dielectric anisotropy and so forth of a liquid crystal compound
Implementation Method 2
The device utilizes optical anisotropy, dielectric anisotropy and so forth of a liquid crystal compound
Implementation Method 3
a liquid crystal composition that contains the compound and has a nematic phase
Data Source
AI summary
To provide a liquid crystal compound satisfying at least one of high stability to heat, light and so forth, a high clearing point, low minimum temperature of a liquid-crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, a suitable elastic constant and excellent compatibility with other liquid-crystal compounds, a liquid crystal composition containing the compound and a liquid crystal display device including the composition.A compound is represented by formula (1-1).For example, R1 and R2 are independently hydrogen, alkyl having 1 to 10 carbons, alkenyl having 3 to 10 carbons and alkoxy having 1 to 9 carbons; ring A1 is 1,4-cyclohexylene; ring A2 and ring A3 are independently 1,4-cyclohexylene or 1,4-phenylene; Z1 is a single bond or —(CH2)2; l is 0 or 1, m and n are 0, 1 or 2, a sum: l+m+n is 0, 1 or 2; x is 0 or 1.