Asymmetric Conductor Layer for Display Substrate Corrosion
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Solution Overview
Problem
The challenge of electrochemical corrosion between electrodes with different potentials in narrow bezel display devices, leading to circuit disconnection and reduced service life, particularly in humid environments.
Innovation Solution
A display substrate design with a conductor layer and electrode layer in different layers, where the conductor portion connected to the low potential electrode has a larger orthographic projection area than the conductor portion connected to the high potential electrode, along with strategic conductor and electrode arrangements to mitigate electrochemical corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GOA technology is used to integrate gate driving circuit on array substrate, then material costs and manufacturing costs are reduced and bezel design is improved, but electrochemical corrosion between electrodes with different potentials occurs leading to circuit disconnection and reduced service life
Solution Approach 1:
The patent applies local quality by creating an asymmetric conductor layer structure where the first conductor portion (connected to low potential electrode) has a larger area than the second conductor portion (connected to high potential electrode). This localized structural difference specifically addresses the corrosion vulnerability at the low potential electrode interface, distributing the electrochemical corrosion current more evenly and reducing corrosion rate at the critical connection point.
Solution Approach 2:
The patent implements asymmetry by designing the conductor layer with unequal areas for the first and second conductor portions. The first conductor portion has a larger area than the second conductor portion, creating an asymmetric configuration that strategically mitigates electrochemical corrosion between electrodes with different potentials while maintaining the integrated GOA circuit design.
2Reliability
If conductor layer and electrode layer are arranged in different layers with asymmetric conductor portions, then electrochemical corrosion is reduced and service life is prolonged, but device structure becomes more complex
Solution Approach 1:
The patent applies dimensionality change by arranging the conductor layer and electrode layer in different layers (vertical stacking) rather than in the same plane. This layered structure, combined with the asymmetric conductor portions, effectively reduces electrochemical corrosion while maintaining reasonable device complexity through efficient spatial utilization.
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
Effectively reduces corrosion rate of low potential electrodes, prolonging the service life of the display substrate by minimizing electrochemical reactions and preventing circuit failures.
Implementation Method 1
The challenge of electrochemical corrosion between electrodes with different potentials in narrow bezel display devices
Implementation Method 2
an area of an orthographic projection of the first conductor portion on the base substrate is greater than an area of an orthographic projection of the second conductor portion on the base substrate... effectively reduces corrosion rate of low potential electrodes... by minimizing electrochemical reactions
Data Source
AI summary
A display substrate includes: a base substrate; and a driving structure layer on a side of the base substrate. The display substrate includes a display region and a non-display region. The driving structure layer includes: an electrode layer including at least one first electrode and at least one second electrode adjacent to each other in the non-display region, wherein a potential of the first electrode is lower than that of the second electrode; and a conductor layer, where the conductor layer and the electrode layer are in different layers. The conductor layer includes a first conductor portion electrically connected to the first electrode and a second conductor portion electrically connected to the second electrode. An area of an orthographic projection of the first conductor portion on the base substrate is greater than that of the second conductor portion on the base substrate.