Piperidine Derivative Liquid Crystal Composition Light Stability
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Solution Overview
Problem
Current liquid crystal compositions face challenges in achieving high stability to light, maintaining solubility, and optimizing physical properties such as maximum and minimum temperatures, viscosity, optical anisotropy, dielectric anisotropy, and elastic constants, which affect the performance and longevity of liquid crystal display devices.
Innovation Solution
A 2,2,6,6-tetramethylpiperidine derivative is introduced as a compound in a liquid crystal composition, enhancing solubility and stability to light, and adjusting physical properties like maximum temperature, minimum temperature, viscosity, optical anisotropy, and dielectric anisotropy, thereby improving the performance and lifespan of liquid crystal display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid crystal composition is designed to have high stability to light, then the service life of the display device is extended, but the solubility of additives in the composition may be compromised
Solution Approach 1:
The patent introduces a novel piperidine derivative with specific molecular structure parameters (formula 1) that changes the solubility characteristics of the composition. By adjusting the chemical structure parameters of the additive, the patent achieves both high light stability and improved solubility simultaneously, resolving the contradiction between these two properties.
Solution Approach 2:
The patent uses a composite approach by combining the piperidine derivative with other liquid crystal compounds and additives in specific proportions. This composite formulation ensures that the light-stabilizing properties are maintained while the overall solubility and compatibility of the composition are optimized through the synergistic effects of multiple components.
2Loss of time
If the viscosity of the liquid crystal compound is decreased to shorten response time, then the response time is reduced, but the threshold voltage may increase
Solution Approach 1:
The patent adjusts the molecular structure parameters of the liquid crystal compounds in the composition to achieve optimal viscosity characteristics. By carefully selecting compounds with specific molecular weights, shapes, and interactions, the patent reduces viscosity for faster response while maintaining dielectric anisotropy to keep threshold voltage at acceptable levels.
Solution Approach 2:
The patent applies different functional compounds with specific local properties to different aspects of the composition. Some compounds are selected primarily for viscosity reduction, while others contribute to dielectric properties. This localized optimization of different properties in the composite composition allows simultaneous improvement of response time and control of threshold voltage.
3Use of energy by moving object
If the dielectric anisotropy is increased to decrease threshold voltage, then power consumption is reduced, but the optical anisotropy may be affected
Solution Approach 1:
The patent carefully selects liquid crystal compounds with specific dielectric and optical parameter combinations. By adjusting the molecular structure parameters of the compounds used, the patent achieves high dielectric anisotropy for low threshold voltage while maintaining sufficient optical anisotropy for good display contrast, optimizing the trade-off between power consumption and display quality.
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 2,2,6,6-tetramethylpiperidine derivative effectively prevents photolysis, improves solubility, and adjusts physical properties to enhance the temperature range, response time, voltage holding ratio, contrast ratio, and service life of liquid crystal display devices.
Implementation Method 1
A compound having the high stability to heat, light and so forth as described in (1) increases a voltage holding ratio of the device. Accordingly, a service life of the device is elongated.
Implementation Method 2
A compound having the suitable optical anisotropy as described in (5) improves a contrast of the device.
Implementation Method 3
A compound having the large dielectric anisotropy as described in (6) decreases a threshold voltage of the device. Accordingly, power consumption of the device becomes small.
Data Source
AI summary
To provide a compound having an effect for preventing photolysis of a liquid crystal composition, and having a high solubility in the liquid crystal composition, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition. The compound is represented by formula (1), the liquid crystal composition contains the compound, and the liquid crystal display device includes the composition.In formula (1), R1, R2, R3 and R4 are independently hydrogen or alkyl having 1 to 4 carbons; ring A1 and ring A2 are independently 1,4-cyclohexylene, 1,4-phenylene or the like; Z1, Z2 and Z3 are independently a single bond, alkylene or the like; and n is 0, 1 or 2.