Liquid Crystal Composition Refractive Anisotropy Optimization
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Solution Overview
Problem
Conventional liquid crystal displays face challenges in increasing transmittance while maintaining low voltage driving, high voltage holding ratio, wide viewing angle, and high speed response, as increasing cell gap reduces process margin, contrast ratio, and increases liquid crystal usage.
Innovation Solution
A liquid crystal composition comprising specific weight percentages of compounds represented by chemical formulas (I) to (X) is used, optimizing refractive anisotropy, dielectric anisotropy, and rotational viscosity to enhance transmittance and response speed, with a cell gap between 3.1 μm to 3.3 μm, and refractive anisotropy between 0.135 to 0.145.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cell gap is increased to increase retardation and transmittance, then transmittance is improved, but process margin of the light blocking member is decreased
Solution Approach 1:
The patent changes the refractive anisotropy parameter (Δn) of the liquid crystal composition to a higher range (0.135 to 0.145) compared to conventional compositions. This parameter change allows achieving the required retardation (Δnd) with a smaller cell gap, thereby improving transmittance while maintaining adequate process margin for the light blocking member.
2Illumination intensity
If the cell gap is increased to increase retardation and transmittance, then transmittance is improved, but contrast ratio is reduced
Solution Approach 1:
The patent optimizes the refractive anisotropy parameter to a specific range (0.135 to 0.145) that simultaneously improves transmittance and maintains contrast ratio. This precise parameter control allows the liquid crystal composition to achieve better optical performance without sacrificing image quality.
3Illumination intensity
If the cell gap is increased to increase retardation and transmittance, then transmittance is improved, but liquid crystal usage amount is increased
Solution Approach 1:
By increasing the refractive anisotropy parameter of the liquid crystal composition, the patent reduces the required cell gap to achieve the same retardation. This results in decreased liquid crystal usage amount while maintaining or improving transmittance performance.
4Illumination intensity
If the refractive anisotropy is increased to improve transmittance, then transmittance is improved, but rotational viscosity may increase affecting response speed
Solution Approach 1:
The patent carefully optimizes the refractive anisotropy parameter within a specific range (0.135 to 0.145) that balances transmittance improvement with response speed maintenance. This controlled parameter change ensures that rotational viscosity does not increase excessively, preserving fast response characteristics.
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 improves transmittance and response speed, maintaining high temperature reliability and contrast ratio, while minimizing rotational viscosity and cell gap limitations.
Implementation Method 1
improving transmittance by increasing refractive anisotropy
Implementation Method 2
the alignment of liquid crystal molecules of the liquid crystal layer is determined by the electric field. Accordingly, the polarization of incident light is controlled
Implementation Method 3
voltages are applied to the field generating electrodes so as to generate an electric field over the liquid crystal layer, and the alignment of liquid crystal molecules of the liquid crystal layer is determined by the electric field
Data Source
AI summary
A liquid crystal composition according to an exemplary embodiment of the present invention includes a liquid crystal compound represented by a below chemical formula (I) at about 10 wt % to about 15 wt %; andat least one liquid crystal compound at about 3 wt % to about 8 wt % among liquid crystal compounds represented by chemical formula (II) to chemical formula (IV).Here, X and Y may be equal to each other or different from each other, and each is an alkyl group or an alkenyl group having a carbon number of 1 to 4.