Liquid Crystal Composition for Wide Temperature Range Displays
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Solution Overview
Problem
Current liquid crystal compositions for display devices face challenges in achieving a high maximum temperature, low minimum temperature, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, high stability to ultraviolet light and heat, and long service life, while maintaining a balance between these characteristics.
Innovation Solution
A liquid crystal composition with negative dielectric anisotropy, containing specific compounds represented by formula (1), is developed, which includes a combination of compounds that enhance the nematic phase temperature range, viscosity, optical anisotropy, and stability, and is used in liquid crystal display devices with active matrix modes such as IPS, VA, and FFS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional liquid crystal compositions are used, then the device can operate, but the maximum temperature of the nematic phase is limited and the minimum temperature is high
Solution Approach 1:
The patent modifies the molecular structure of liquid crystal compounds by introducing specific chemical groups and substituents (as shown in the general formulas) to change the physical parameters of the composition, thereby expanding the nematic phase temperature range and improving overall performance characteristics
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple different liquid crystal compounds with specific molecular structures, where each component contributes different properties that collectively achieve the desired wide temperature range and long service life
2Speed
If the viscosity of the liquid crystal composition is reduced for shorter response time, then the response time improves, but the stability to ultraviolet light and heat deteriorates
Solution Approach 1:
The patent carefully adjusts molecular parameters such as chain length, substituent types, and molecular weight to achieve the optimal balance between viscosity and stability, where moderate viscosity reduction is accomplished while maintaining or enhancing UV and heat stability through careful molecular design
3Illumination intensity
If the optical anisotropy is increased for larger contrast ratio, then the contrast ratio improves, but the dielectric anisotropy may become insufficient for low threshold voltage
Solution Approach 1:
The patent modifies molecular structure parameters to simultaneously optimize both optical and dielectric anisotropy, using specific chemical substitutions and molecular arrangements that enhance light modulation capability while maintaining sufficient dielectric response for low operating voltages
4Reliability
If the specific resistance is increased for larger voltage holding ratio, then the voltage holding ratio improves, but the manufacturing complexity increases
Solution Approach 1:
The patent achieves high specific resistance through careful selection of liquid crystal compounds with appropriate molecular structures and purity levels, avoiding overly complex purification processes while maintaining the necessary electrical insulation properties for high voltage holding ratios
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 achieves a high maximum temperature, low minimum temperature, short response time, large voltage holding ratio, low threshold voltage, and long service life, improving the performance and durability of liquid crystal display devices.
Implementation Method 1
A liquid crystal composition which has a negative dielectric anisotropy
Implementation Method 2
A liquid crystal composition having a negative dielectric anisotropy... A large optical anisotropy of the composition relates to a contrast ratio in the device
Data Source
AI summary
A liquid crystal composition satisfies at least one of characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature of the nematic phase, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, large specific resistance, high stability to ultraviolet light and heat, or has a suitable balance regarding at least two of the characteristics. The composition contains a specific compound having high stability to ultraviolet light as a first component, and a liquid crystal display device includes the composition. The composition may contain a specific compound having large negative dielectric anisotropy as a second component, a specific compound having high maximum temperature or small viscosity as a third component, and a specific compound having a polymerizable group as an additive component.