Liquid Crystal Display Device with Optimized Viscosity
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving fast response times and maintaining voltage stability at high temperatures, with existing technologies experiencing slower response speeds and potential defects due to viscosity issues in the liquid crystal layer.
Innovation Solution
A liquid crystal display device is designed with a liquid crystal layer having negative dielectric anisotropy and rotational viscosity between 47 mPa·S to 75 mPa·S, allowing for improved response speed and voltage maintaining rate, achieved by optimizing the composition of neutral and polar liquid crystal molecules and adjusting the drive temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid crystal molecules have high rotational viscosity to maintain voltage stability, then the voltage maintaining rate improves, but the response speed decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the rotational viscosity of liquid crystal molecules within the range of 47-75 mPa·S and operating at specific temperature ranges. This optimization of physical parameters enables the liquid crystal layer to achieve both fast response speed (4.0 ms or less) and high voltage maintaining rate, resolving the contradiction between speed and reliability
Solution Approach 2:
The patent uses composite liquid crystal materials comprising multiple components with different molecular structures and properties. By combining liquid crystal compounds with specific rotational viscosity characteristics, the invention creates a composite material system that simultaneously achieves fast response and stable voltage maintenance, overcoming the limitations of single-component liquid crystals
2Speed
If the liquid crystal display device operates at high temperature to improve response speed, then the response time decreases, but the voltage maintaining rate deteriorates
Solution Approach 1:
The patent applies parameter changes by identifying and controlling the optimal temperature range for device operation. By maintaining the liquid crystal display device within specific temperature boundaries, the invention ensures that the liquid crystal molecules retain their optimized rotational viscosity characteristics, thereby achieving both fast response speed and high voltage maintaining rate simultaneously without the trade-off observed in conventional devices
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 device operates with a response speed of 4.0 ms or less and maintains a high voltage maintaining rate, effectively displaying images without afterimages and ensuring stable operation across varying temperatures.
Implementation Method 1
The liquid crystal display device controls the transmittance of light through the liquid crystal layer, in accordance with an electric field formed between the pixel electrodes and the common electrode
Implementation Method 2
The liquid crystal layer includes liquid crystal molecules having a negative dielectric anisotropy
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. The liquid crystal layer includes liquid crystal molecules having a negative dielectric anisotropy, a response speed of about 4.0 ms or less, and a rotational viscosity of about 47 mPa·S to about 75 mPa·S.