Eccentric Polymer Distribution in Liquid Crystal Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal devices used in compact devices like cellular phones face challenges in maintaining response properties over a wide temperature range due to the presence of impurities from polymerizable monomers and initiators, which also affect reliability.
Innovation Solution
A liquid crystal device design where the polymer is eccentrically distributed on one or both substrates, with a reduced weight percentage of polymerizable monomers, using a photo-polymerizable monomer and ultraviolet absorbing agents to polymerize and stabilize the liquid crystal layer, ensuring excellent response properties across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If polymerizable monomers and initiators are added to liquid crystal compositions to achieve fast-switching, then response time is improved, but impurities remain in the liquid crystal layer reducing reliability
Solution Approach 1:
The patent converts the harmful effect of impurities (polymerizable monomers and initiators) into a beneficial outcome by using them to form a polymer network that stabilizes the liquid crystal composition. The impurities become the desired polymer structure that provides fast-switching performance while maintaining reliability through eccentric distribution that minimizes negative effects.
Solution Approach 2:
The patent applies local quality by creating an eccentric distribution of polymer throughout the liquid crystal layer, concentrating the polymer network in specific regions rather than uniform distribution. This localized approach maintains the beneficial fast-switching effects while minimizing the harmful impacts of impurities in critical areas.
2Ease of manufacture
If conventional liquid crystal compositions are used in compact devices, then manufacturing is simplified, but response properties deteriorate over wide temperature ranges
Solution Approach 1:
The patent creates a composite liquid crystal composition containing liquid crystal molecules, polymerizable monomers, and initiators that work together to provide both fast response times and wide temperature range operation. This composite approach maintains manufacturing simplicity while achieving superior performance through the synergistic interaction of multiple components.
Solution Approach 2:
The patent utilizes parameter changes by controlling the polymerization process and composition ratios to optimize the liquid crystal's response properties across different temperature conditions. The composition is designed to maintain desired characteristics from -30°C to +70°C through careful selection of liquid crystal hosts and polymerizing agents.
3Stability of the object's composition
If polymer is uniformly distributed in liquid crystal layer, then stabilization is maximized, but response properties worsen due to impurity effects
Solution Approach 1:
The patent resolves this contradiction by implementing an eccentric distribution of polymer, where the polymer network is concentrated in specific regions of the liquid crystal layer rather than uniformly distributed. This localized stabilization provides sufficient composition stability while minimizing the negative impact of polymer impurities on overall response time.
Solution Approach 2:
The patent applies partial action by providing stabilization only in the regions where polymer is eccentrically distributed, rather than attempting uniform stabilization throughout the entire liquid crystal layer. This partial stabilization approach is sufficient to maintain composition stability while preserving fast response properties in the remaining regions.
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 solution enables liquid crystal devices to exhibit improved response times and reliability over a wide temperature range while minimizing the amount of polymerizable monomers, effectively addressing the impurity-related issues and maintaining high performance.
Implementation Method 1
it was necessary to fill liquid crystal compositions, which were prepared by adding a considerable weight percentage of photo-polymerizable monomers and polymeric initiators to liquid crystal compositions, between a pair of substrates and then polymerize the photo-polymerizable monomers by irradiating the liquid crystal compositions with ultraviolet
Data Source
AI summary
There is provided a liquid crystal device that exhibits excellent response properties over a wide temperature range even when the weight percentage of the polymerizable monomer used for generating polymers is decreased. The liquid crystal device according to the present invention is a liquid crystal device which includes a first substrate and a second substrate, at least one of which has an electrode group formed thereon for driving liquid crystals; and a liquid crystal layer sandwiched between the first substrate and the second substrate, in which the liquid crystal layer contains a polymer which is eccentrically distributed on at least one substrate side among the first substrate and the second substrate.