Liquid Crystal Composition for One-Drop-Fill Stability
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Solution Overview
Problem
Current liquid crystal compositions for display devices face challenges in achieving a positive dielectric anisotropy, wide temperature range, low viscosity, high specific resistance, and high voltage holding ratio, while also being stable to heat and light, which affects display quality and production yield, especially in large-size displays and small smartphones.
Innovation Solution
A liquid crystal composition with a positive dielectric anisotropy, comprising specific compounds represented by General Formulae (i) and (ii), and optionally other compounds, optimized in mass percentage to ensure stability, viscosity, and response speed, allowing for stable and continuous dropping during the one-drop-fill technique, thereby enhancing display quality and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a liquid crystal composition with positive dielectric anisotropy is used to achieve wide temperature range and low viscosity, then the response speed is improved, but the manufacturing precision deteriorates due to droplet stains in one-drop-fill process
Solution Approach 1:
The patent modifies the molecular structure of liquid crystal compounds by introducing specific groups (Formula i with R1-R6 substituents and Formula ii with R7-R12 substituents) to change the physical parameters of the composition. This structural parameter change enables the composition to maintain stable viscosity and surface tension characteristics during the one-drop-fill process, preventing droplet stains while preserving fast response speed
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds with specific molecular structures (Formula i and Formula ii in defined ratios). This composite approach allows the composition to exhibit synergistic effects, where the combination of compounds provides both fast response characteristics and improved manufacturing stability, resolving the contradiction between speed and precision
2Productivity
If the amount of liquid crystal composition is reduced for small-size displays, then the productivity is improved, but the manufacturing precision deteriorates due to difficulty in controlling variation from optimum amount
Solution Approach 1:
The patent changes the physical parameters of the liquid crystal composition, specifically optimizing viscosity and surface tension through molecular structure modification. These parameter changes enable the composition to be dropped in precise amounts even in small quantities, reducing variation and improving control precision during the one-drop-fill process for small-size displays
3Use of energy by moving object
If a liquid crystal composition with large absolute value of positive dielectric anisotropy is used to enable low driving voltage, then the power consumption is reduced, but the manufacturing precision deteriorates due to instability during dropping process
Solution Approach 1:
The patent optimizes the molecular structure parameters of the liquid crystal compounds to achieve a balance between dielectric anisotropy and physical stability. By carefully selecting substituents and molecular configurations in Formula i and Formula ii, the composition maintains large positive dielectric anisotropy for low driving voltage while simultaneously achieving stable viscosity and surface tension for reliable dropping process
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 provides improved resistance to low-temperature resolution, high specific resistance, and voltage holding ratio, enabling high-yield production of liquid crystal display devices with reduced defects, suitable for various display modes like IPS and FFS, and maintaining excellent display quality across different sizes.
Implementation Method 1
a liquid crystal composition having a positive dielectric anisotropy (Δ∈)... molecules of a liquid crystal composition having a positive Δ∈ are vertically aligned in a state in which voltage is not applied, and then a horizontal electric field is applied for performing display
Implementation Method 2
adjust, for example, the dielectric anisotropy (Δ∈) and/or refractive index anisotropy (Δn) to be optimum to individual display devices... control Δn×d that is a product of Δn and a cell gap (d) to be a predetermined value
Data Source
AI summary
There is provided a liquid crystal composition containing a compound represented by General Formula (i) (where Ri represents an alkyl group having 1 to 5 carbon atoms) and a compound represented by Formula (ii), and there is also provided a liquid crystal display device using such a liquid crystal composition.