Ion Conductor with Liquid Crystal for Electrochromic Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrochromic display devices face challenges in achieving fast response speeds, excellent memory characteristics, and reliability due to issues with ion conductivity, volatility, and blurring of images, particularly when using liquid electrolytes that are prone to leakage and uneven distribution.
Innovation Solution
An ion conductor is developed that includes a mixture of an electrolyte with inorganic or organic pairs of negative and positive ions and a low-molecular liquid crystal material, where the impedance varies with applied voltage, enabling controlled ion conductivity for faster coloring and decoloring, and maintaining image stability without blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a liquid electrolyte is used to achieve fast response speed, then ion conductivity is improved, but reliability deteriorates due to leakage and volatility
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid by using a solid electrolyte material. This transformation maintains sufficient ion conductivity for fast response while eliminating the reliability issues associated with liquid electrolytes such as leakage and volatility. The solid electrolyte achieves this through its crystalline or amorphous structure that allows ion transport without fluidity.
Solution Approach 2:
The patent employs a composite material system consisting of solid electrolyte combined with electrochromic compounds and conductive polymers. This composite structure integrates the ion-conducting properties of solid electrolyte with the electrochromic functionality, achieving both fast response speed and high reliability through synergistic material interactions.
2Reliability
If a solid electrolyte is used to improve reliability, then volatility is reduced, but response speed deteriorates due to lower ion conductivity
Solution Approach 1:
The patent optimizes the parameter of ion conductivity in solid electrolytes by selecting specific materials with high ionic mobility. The solid electrolyte is engineered to have crystal structures or amorphous networks that facilitate rapid ion transport, thereby achieving fast response speeds despite the solid state. This parameter optimization resolves the traditional trade-off between solid state reliability and response speed.
3Speed
If high ion conductivity is achieved to improve response speed, then coloring and decoloring speed increases, but image stability deteriorates due to blurring
Solution Approach 1:
The patent applies local quality control by creating spatially differentiated zones within the electrochromic device. The solid electrolyte is positioned and structured to provide localized ion transport pathways that are sufficient for fast response while being constrained in extent to prevent excessive ion migration. This localized ion conduction maintains image stability by preventing ion accumulation at boundaries that would cause blurring.
Solution Approach 2:
The solid electrolyte acts as an intermediary material that mediates between the electrochromic compounds and the electrodes. It provides controlled ion transport that enables fast electrochromic switching while its solid nature and structured morphology prevent uncontrolled ion diffusion that would lead to image blurring. The solid electrolyte thus mediates between the need for fast ion transport and the need for spatially confined ion distribution.
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 provides an electrochromic display device with improved response speed, memory characteristics, and reliability, reducing volatility and blurring, while maintaining high image quality and energy efficiency.
Implementation Method 1
an impedance of the ion conductor varies in accordance with an increase of a voltage applied to the ion conductor due to an orientation response of the low-molecular liquid crystal material
Implementation Method 2
when a voltages is applied, based on the polarity of the voltage, redox reactions occur, so that the color is reversibly changed
Implementation Method 3
The electrochromic phenomenon is also called electrochromism in which when a voltages is applied, based on the polarity of the voltage, redox reactions occur, so that the color is reversibly changed
Implementation Method 4
it is the characteristics of an electrolyte layer (e.g., ion conductivity) that may largely influence the response speed or the memory effect of developed color
Data Source
AI summary
An ion conductor includes a mixture including an electrolyte including a salt including inorganic or organic pairs of negative and positive ions, and a low-molecular liquid crystal material. Further, an impedance of the ion conductor varies in accordance with an increase of a voltage applied to the ion conductor due to an orientation response of the low-molecular liquid crystal material, the impedance being determined by an AC impedance method.