Via Hole Protection Layer for Bonding Element Etching Stability
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Solution Overview
Problem
In reflective liquid crystal display panels, the stability of electrical signal transmission is compromised due to the risk of damage to the second conductive layer during the etching process for forming reflection electrodes, which can lead to unstable screen displays.
Innovation Solution
The implementation of a via hole protection layer, made from the same material as the reflection electrode, covers the via holes in the insulation layer to prevent damage from etching solutions while ensuring the first conductive layer remains exposed for stable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the etching process is used to form reflection electrodes, then the reflection electrode can be formed, but the second conductive layer may be damaged leading to unstable signal transmission
Solution Approach 1:
The via hole protection layer acts as an intermediary between the etching solution and the second conductive layer. It selectively protects the via hole region from etching solution intrusion while allowing the etching process to proceed for forming the reflection electrode, thus preventing damage to the second conductive layer and ensuring stable signal transmission
Solution Approach 2:
The via hole protection layer is formed in advance before the etching process. This preliminary protective measure ensures that when the etching solution is applied to form the reflection electrode, the second conductive layer is already protected, preventing potential damage and ensuring reliable electrical signal transmission
2Reliability
If the via hole protection layer covers the via hole, then the second conductive layer is protected from etching damage, but the first conductive layer contact surface must remain exposed for signal transmission
Solution Approach 1:
The via hole protection layer exhibits local quality by being selectively positioned only at the via hole region rather than covering the entire first conductive layer. This localized protection approach allows the second conductive layer to be protected where needed while maintaining exposure of the first conductive layer contact surface for electrical connection, balancing protection requirements with signal transmission needs
Data Source
AI summary
A display substrate including: a base substrate, wherein at least one bonding element to be electrically connected to an external component is disposed in a peripheral region of the base substrate. The bonding element includes a first conductive layer, a second conductive layer and an insulation layer. The first conductive layer includes a metal oxide conductive lead. The second conductive layer includes a metal conductive lead. One or more via holes are provided in a region of the insulation layer. The metal conductive lead is electrically connected to the metal oxide conductive lead through the one or more via holes. The bonding element further comprises a via hole protection layer. A reflective liquid crystal display panel and an electrical apparatus are provided.