Liquid Crystal Composition for One-Drop-Fill Manufacturing
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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 stability to heat and light, while also requiring precise control to prevent defects like screen burn-in and droplet stains during the manufacturing process, especially in large-size displays and smartphones.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by Formulas (i) and (ii), with optional compounds represented by General Formulas (L) and (M), optimized in mass percentage ratios to enhance solubility, response speed, and electrical reliability, allowing for stable and continuous droplet formation during the one-drop-fill technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid crystal composition is dropped onto substrate using one-drop-fill technique, then manufacturing efficiency is improved, but droplet stains are generated which degrade display quality
Solution Approach 1:
The patent modifies the chemical composition parameters of the liquid crystal mixture, specifically incorporating compounds with fluorinated groups and cyanobiphenyl structures that alter surface tension and wetting properties. This enables the liquid crystal to be dropped without forming stains while maintaining display quality
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds with different molecular structures including fluorinated cyclohexane groups, cyanobiphenyl cores, and alkyl chains. This composite approach achieves both manufacturability via ODF and high display quality by balancing various physical properties
2Power
If liquid crystal composition has large absolute value of dielectric anisotropy, then driving voltage is reduced, but response speed becomes slow
Solution Approach 1:
The patent carefully adjusts the dielectric anisotropy parameter to an optimal range by selecting compounds with specific polar groups (cyano, fluorinated) while controlling molecular length and flexibility. This achieves low driving voltage without sacrificing response speed
Solution Approach 2:
The patent introduces compounds with localized polar regions (cyano groups at specific positions, fluorinated side chains) that create strong dipole moments for low voltage operation while maintaining overall molecular flexibility for fast response. The polar groups are positioned strategically to optimize both electrical and mechanical properties
3Speed
If liquid crystal composition has low viscosity, then response speed is improved, but solubility at low temperature deteriorates
Solution Approach 1:
The patent combines compounds with different chain lengths and structural characteristics. Shorter alkyl chains and fluorinated groups reduce viscosity for fast response, while the diverse molecular structures in the composite ensure good mutual solubility and prevent crystallization at low temperatures
Solution Approach 2:
The patent modifies the temperature-viscosity relationship by incorporating compounds with specific melting points and molecular symmetries. The fluorinated groups and cyclic structures lower the freezing point while maintaining low viscosity, achieving both fast response and low-temperature stability
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 achieves improved solubility at low temperatures, maintains low viscosity and high specific resistance, enabling high-yield production of liquid crystal display devices with reduced defective displays and improved display quality, suitable for various modes like IPS and FFS.
Implementation Method 1
A liquid crystal composition having a positive Δ∈ has therefore further increased
Implementation Method 2
having a liquid crystal phase in a wide temperature range mainly including room temperature as much as possible
Data Source
AI summary
It is an object of the present invention to provide a liquid crystal composition having a positive Δ∈ as well as a liquid crystal phase in a wide temperature range, good solubility at low temperature, excellent adaptability to an ODF process, high specific resistance, a high voltage holding ratio, and stability to heat and light. In order to achieve this object, a liquid crystal composition containing a compound represented by Formula (i) and a compound represented by Formula (ii) is provided.