Electro-chromic Display Third Electrode Color Reduction
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Solution Overview
Problem
Electro-chromic display elements face significant degradation in display quality due to incomplete color reduction, particularly in segment and dot-matrix display types, where charge dispersion leads to incomplete color development and reduction, affecting white reflectance and contrast ratios.
Innovation Solution
Incorporating a third electrode between the display electrode and the opposing electrodes, with an electro-chromic layer placed between the third electrode and the display electrode, allows for controlled color reduction by applying a voltage between the display electrode and the third electrode, ensuring complete color reduction and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If charge movement is used for color developing between display/opposing electrodes, then color display is achieved, but charge dispersion causes incomplete color reducing and display quality degradation
Solution Approach 1:
The patent segments the electrode structure by introducing a third electrode between the display electrode and the opposing electrodes. This segmentation allows independent control of color developing (via display electrode) and color reducing (via third electrode), preventing charge dispersion from causing incomplete color reduction and thereby resolving the contradiction between achieving color display and maintaining display quality.
Solution Approach 2:
The third electrode acts as an intermediary element that mediates the color reduction process. By placing the electro-chromic layer between the display electrode and the third electrode, the third electrode serves as a dedicated mediator for removing charges and reducing color, independent of the opposing electrodes used for color development. This intermediary structure ensures complete color reduction and maintains high display quality.
2Adaptability or versatility
If multiple electro-chromic compounds are laminated for multi-color display, then color variety is improved, but structural complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the third electrode to serve multiple purposes: it acts as a counter electrode for color reduction, provides a reference potential for electro-chromic layer control, and enables independent erasure of displayed colors. This universal electrode design allows multi-color display capability while avoiding the need for separate complex electrode structures for each color, thereby resolving the contradiction between color variety and structural complexity.
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
This configuration effectively eliminates incomplete color reduction, enhancing display quality by maintaining high white reflectance and contrast ratios, thereby improving the usability of electro-chromic display elements in electronic paper applications.
Implementation Method 1
The electro-chromism is a phenomenon in which applying a voltage induces reversible oxidation and deoxidation reactions, so that color changes reversibly
Implementation Method 2
an electrolytic layer which is provided so as to be placed between the display electrode and the multiple opposing electrodes
Data Source
AI summary
An electro-chromic display element includes a display electrode 1 provided on a display substrate 1b an electro-chromic layer 3 provided on the display electrode 1; multiple opposing electrodes 2 which are provided on an opposing substrate 2b and which are arranged to oppose the display electrode 1; an electrolytic layer 4 provided between the display electrode 1 and the multiple opposing electrodes 2; and an erasing electrode 5 placed between the display electrode 1 and the multiple opposing electrodes 2 and which is arranged such that the electro-chromic layer 3 is placed between the third electrode and the display electrode 1.