Polyphthalate Electrochromic Device for RGB Displays
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Solution Overview
Problem
Current electrochromic devices lack bistability and the ability to form a red electrochromic layer, limiting their application in RGB color displays, particularly due to the rapid electrical neutralization of electrochromic materials when the power source is off.
Innovation Solution
An electrochromic device utilizing polyphthalate as an electrochromic material in a solid phase, with a process involving the formation of a polyphthalate electrochromic layer on transparent electrodes and nanocrystalline particles, ensuring bistability and enabling the creation of a red electrochromic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a solution type electrochromic material is used, then the electrochromic device can be manufactured easily, but the device loses bistability due to rapid electrical neutralization when power is off
Solution Approach 1:
The patent changes the physical state parameter of the electrochromic material from dissolved (solution type) to solid phase (immobilized), which fundamentally alters the electrical neutralization behavior and enables bistability while maintaining manufacturing feasibility through simple coating processes
Solution Approach 2:
The patent uses a simple coating process that forms a thin film of electrochromic material on the substrate, replacing complex solution-type devices with a more stable solid-phase structure that can be manufactured easily and maintains long-term reliability
2Device complexity
If conventional electrochromic materials are used, then the device structure is simple, but the device cannot form a red electrochromic layer limiting RGB color display application
Solution Approach 1:
The patent changes the chemical composition parameter by introducing a specific substituted phthalocyanine compound with methyl and carboxymethyl groups, which enables red color electrochromism while maintaining the simple two-electrode device structure
Solution Approach 2:
The patent creates a composite system combining the substituted phthalocyanine electrochromic material with a gel polymer electrolyte, achieving red color display capability and bistability without significantly increasing device structural complexity
3Speed
If an inorganic electrochromic material is used, then the electrochromic response speed is fast, but the device lacks flexibility and portability
Solution Approach 1:
The patent replaces rigid inorganic electrochromic materials with an organic polymer-based gel electrolyte system that provides comparable electrochromic response speed while enabling flexibility and portability for various display applications
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 device achieves bistability and facilitates the formation of a red electrochromic layer, enhancing its applicability in RGB color displays by maintaining electrochromic properties even after the power source is turned off.
Implementation Method 1
Electrochromism is the phenomenon displayed by some chemical species of reversibly changing color when a voltage is applied
Implementation Method 2
A material capable of undergoing reversible changes of optical properties by the electrochemical redox reaction accompanying such electrochromic properties is called an electrochromic material
Data Source
AI summary
Example embodiments provide an electrochromic device using polyphthalate as an electrochromic material and a process for preparing the same. The electrochromic device in accordance with example embodiments enables the production of a solid nanoscale electrochromic device having a bistability using polyphthalate as an electrochromic material, and easy formation of a red electrochromic layer which was not reported in a conventional art. Accordingly, the electrochromic device of example embodiments can be usefully employed for fabrication of RGB color electrochromic displays.