Sacrificial Electrode Corrosion Protection Display Substrate
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Solution Overview
Problem
The pad parts on display substrates are prone to corrosion, which can degrade the display quality by allowing oxidation reactions to infiltrate the display panel, especially when exposed for extended periods during device coupling.
Innovation Solution
A display substrate design incorporating a sacrificial electrode with a lower standard reduction potential than the pad electrode, which is exposed to the external environment, minimizes oxidation of the pad part by facilitating oxidation reactions at the sacrificial electrode instead, thereby reducing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pad part is exposed to the external side for device coupling, then the external device can be electrically connected to the display panel, but the pad part becomes susceptible to corrosion and oxidation
Solution Approach 1:
The patent introduces a sacrificial electrode as an intermediary element between the pad electrode and the external environment. This sacrificial electrode has lower corrosion resistance than the pad electrode, so it preferentially undergoes oxidation and corrosion, thereby protecting the pad electrode from degradation while allowing the pad part to remain exposed for electrical connections
Solution Approach 2:
The sacrificial electrode is designed as a consumable component that is intentionally made less durable than the pad electrode. It serves as a disposable protective layer that sacrifices itself through preferential corrosion, shielding the more valuable and critical pad electrode from environmental damage during the exposure period
2Reliability
If the pad part is covered to prevent corrosion, then corrosion resistance is improved, but the external device cannot be electrically connected to the display panel
Solution Approach 1:
The patent segments the electrode structure into two distinct functional parts: the pad electrode for electrical connection and the sacrificial electrode for corrosion protection. This segmentation allows each component to perform its specific function - the pad electrode remains accessible for connections while the sacrificial electrode provides protective coverage
3Duration of action of moving object
If the coupling time is extended, then the device integration is more thorough, but the pad part exposure time increases leading to higher corrosion risk
Solution Approach 1:
The sacrificial electrode provides beforehand cushioning against corrosion by being positioned to protect the pad electrode before exposure to the environment. This pre-arranged protective measure ensures that even during extended coupling periods, the pad electrode remains shielded from oxidative damage throughout the entire exposure duration
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 design effectively prevents corrosion of the pad part, enhancing the reliability and longevity of the display substrate by redirecting oxidation reactions away from the critical components, while also simplifying the manufacturing process and reducing costs.
Implementation Method 1
A portion of the sacrificial electrode is exposed to an external side of the display substrate... the sacrificial electrode with a lower standard reduction potential than the pad electrode... facilitating oxidation reactions at the sacrificial electrode instead
Data Source
AI summary
A display substrate includes a substrate, a pixel part, a pad part and a sacrificial electrode. The substrate includes a display area and a peripheral area. The pixel part is on the display area and includes a switching element, and a pixel electrode electrically connected to the switching element. The pad part is on the peripheral area and contacts a terminal of an external device. The pad part includes a pad electrode a contact electrode. The pad electrode includes a first metal layer, and a second metal layer on the first metal layer, and the contact electrode contacts the second metal layer. The sacrificial electrode is spaced apart from the pad electrode and contacts the contact electrode. An exposed portion of the sacrificial electrode is exposed to an external side of the display substrate.