Liquid Crystal Composition for Fast Response Time
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Solution Overview
Problem
The operational speed of liquid crystal displays is limited in small-sized devices due to the restricted increase in electric field intensity, which hampers rapid alignment of liquid crystals and subsequently affects the display's response time.
Innovation Solution
A liquid crystal composition comprising specific compounds with controlled rotational viscosity and dielectric anisotropy, optimized for use in a liquid crystal display with adjusted cell gap and driving voltage, to enhance the alignment speed and response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the intensity of the electric field is increased to rapidly change the alignment of liquid crystals, then the operational speed is improved, but the device cannot be driven with low-voltage which limits the electric field intensity increase
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid crystal material by incorporating specific compounds (cyclic carbonate compounds and/or cyclic carboxylate compounds) with controlled rotational viscosity and dielectric anisotropy values. This allows the liquid crystals to achieve faster alignment speed at lower electric field intensities, resolving the contradiction between operational speed and driving voltage requirements
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple components including cyclic carbonate compounds, cyclic carboxylate compounds, and other liquid crystal compounds in specific ratios. This composite formulation achieves optimized rotational viscosity and dielectric anisotropy properties that enable fast response at low voltage, simultaneously improving operational speed while maintaining low-voltage operation
2Loss of time
If the alignment of liquid crystals changes rapidly to improve operational speed, then the response time is reduced, but the rotational viscosity and dielectric anisotropy must be precisely controlled
Solution Approach 1:
The patent establishes specific parameter ranges for rotational viscosity (61-65 mPa·s) and dielectric anisotropy (7.0-9.0) to achieve optimal response time. By defining these precise parameter windows and using compounds that naturally fall within these ranges, the patent balances the need for fast response time with manageable manufacturing precision requirements
Solution Approach 2:
The composite liquid crystal formulation combines compounds with complementary properties where the cyclic carbonate and cyclic carboxylate compounds provide the necessary rotational viscosity and dielectric anisotropy characteristics. This composite approach achieves the desired response time while allowing for broader manufacturing tolerances compared to using single-component systems
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 optimized liquid crystal composition improves the operational speed of liquid crystal displays by reducing response time to 8 ms or less, with a rotational viscosity range of 61 mPa·s to 65 mPa·s and a cell gap between 3.5 μm to 3.75 μm, achieving faster image transition and improved display performance.
Implementation Method 1
the alignment of the liquid crystals changes according to the electric field
Implementation Method 2
An electric field is generated between the electrodes and applied to the liquid crystal layer
Implementation Method 3
a rotational viscosity range of 61 mPa·s to 65 mPa·s
Data Source
AI summary
Disclosed are a liquid crystal composition and a liquid crystal display using the same. The liquid crystal composition includes a polar compound and a low-viscosity compound. The liquid crystal display includes first and second substrates that face each other, and first and second electrodes disposed on the first and second substrates, respectively. A liquid crystal layer including the liquid crystal composition is disposed between the first and second substrates.