Electrochromic Display Electrode Segmentation for Leakage Control
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Solution Overview
Problem
Electrochromic display devices face challenges in independently driving electrochromic layers to develop colors while maintaining stability and sufficient insulation between electrodes, leading to issues with color retention and interference between pixel electrodes.
Innovation Solution
An electrochromic display device configuration with a display substrate, counter substrate, electrolyte layer, and separate display electrodes, where the electrolyte layer provides ion migration and insulation, and the electrochromic layers are driven by voltage application to develop or reduce colors, with insulator layers and protective layers ensuring independent color development and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric resistance between display electrodes is reduced to enable independent driving, then color development control is improved, but current leakage to unselected electrodes occurs causing loss of insulation
Solution Approach 1:
The patent divides the display electrode into multiple segments by forming insulator layers at specific regions. This segmentation creates electrically isolated zones that prevent current leakage to unselected electrodes while maintaining low resistance pathways for selected electrodes, thus enabling independent color development control without harmful current leakage
Solution Approach 2:
The insulator layers act as intermediary elements between display electrodes. These insulator layers provide electrical isolation that prevents direct current leakage between adjacent electrodes, while still allowing the system to achieve independent driving through controlled voltage application to segmented electrode regions
2Reliability
If insulator layers are formed between electrochromic layers and display electrodes to improve insulation, then electrode independence is improved, but electrolyte permeability may be compromised
Solution Approach 1:
The patent employs porous insulator layers that provide both electrical insulation and electrolyte permeability. The porous structure allows electrolyte ions to pass through the insulator layers to reach the electrochromic layers for color development, while simultaneously providing sufficient electrical isolation between adjacent display electrodes to prevent current leakage
Solution Approach 2:
The insulator layers are designed as composite structures that combine materials with contrasting properties: one material providing electrical insulation and another enabling electrolyte permeability. This composite approach resolves the contradiction by integrating both required functions within the same insulator layer structure
3Use of energy by moving object
If open-circuit configuration is used to retain developed colors, then energy consumption is reduced, but color stability deteriorates over time
Solution Approach 1:
The patent implements a retaining voltage application mechanism that periodically maintains the electrochromic layers in their developed color state. Instead of using open-circuit configuration, the system applies low-level retaining voltages at scheduled intervals to counteract natural color fading, thus maintaining color stability while consuming minimal energy compared to continuous voltage application
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 stable and independent color development in electrochromic layers, improving image display speed and implementing an active drive system with sufficient insulation between electrodes, allowing for effective multicolor image display.
Implementation Method 1
Electrochromism is a phenomenon displayed by some materials of reversibly changing the color due to reversible redox induced when a voltage is applied
Implementation Method 2
two or more electrochromic layers which develop or reduce a corresponding color by redox reactions
Implementation Method 3
an electrolyte layer arranged between the display substrate and the set of the counter electrodes
Data Source
AI summary
An electrochromic display device includes a display substrate, a counter substrate facing the display substrate, counter electrodes arranged on the counter substrate, an electrolyte layer arranged between the display substrate and the counter electrodes, display electrodes separately arranged from one another between the display substrate and the counter electrodes, electrochromic layers to develop or reduce a color by redox reactions, the electrochromic layers being formed on the respective display electrodes arranged such that the electrochromic layers face the set of the counter electrodes, a voltage applying unit to select one of the display electrodes to connect the selected display electrode and the counter electrodes to apply a voltage between the connected display electrode and counter electrodes, a disconnecting unit to disconnect the unselected display electrodes from the counter electrodes, and an interelectrode connecting unit to connect the display electrodes.