Display Panel Signal Line Bridge Structure for Corrosion Resistance
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Solution Overview
Problem
Conventional display panels face increased contact impedance in adaptor holes due to corrosion of metal materials with high temperature resistance and low electrical resistance, leading to performance and quality issues in high-resolution, high-frequency display products.
Innovation Solution
The display panel design includes a bridge portion electrically connected to the first and second wire sections in different layers, with a light shielding layer providing enhanced hydrofluoric acid corrosion resistance, and the use of alloy materials or lamination metal film multi-layers for the wire sections, preventing over-etching and reducing contact impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal material with high temperature resistance and low electrical resistance is used to replace Mo metal, then the resistivity is reduced and charge rate performance is improved, but the metal is vulnerable to hydrofluoric acid corrosion resulting in increased contact impedance
Solution Approach 1:
A bridge portion is introduced as an intermediary element between the first wire section and the second wire section. This bridge portion is configured to extend through the adaptor hole and provides a protected metal material that is resistant to hydrofluoric acid corrosion, thereby mediating the electrical connection while protecting against the harmful corrosive environment.
Solution Approach 2:
The signal line employs a composite structure consisting of multiple wire sections (first wire section, bridge portion, second wire section) made of different metal materials. The bridge portion uses a metal material with high hydrofluoric acid resistance, while other sections may use materials optimized for electrical performance, creating a composite structure that balances both corrosion resistance and electrical conductivity.
2Reliability
If hydrofluoric acid is used to remove oxide layer in contact hole, then electrical characteristics are improved, but the metal in adaptor hole is corroded resulting in increased contact impedance
Solution Approach 1:
The bridge portion serves as a protected intermediary that is specifically designed to withstand hydrofluoric acid exposure. By positioning this acid-resistant bridge portion within the adaptor hole, the structure allows hydrofluoric acid to be used for oxide removal in contact holes while the bridge portion protects the metal from excessive corrosion and material loss.
Solution Approach 2:
Different metal materials are applied to different parts of the signal line structure. The bridge portion located in the adaptor hole uses a metal material with high hydrofluoric acid resistance, while other wire sections may use materials optimized for electrical performance. This local differentiation of material properties allows selective protection where needed.
Data Source
AI summary
The present application discloses a display panel and an electrical terminal. The display panel includes: an underlay; an array driver layer located on the underlay and including a gate electrode layer and a source and drain electrode layer; a signal line including an adaptor portion located in the non-display region, wherein the adaptor portion includes a first wire section disposed in a same layer with the gate electrode layer, a second wire section disposed in a same layer with the source and drain electrode layer, and a bridge portion electrically connected to the first wire section and the second wire section; wherein the first wire section, the second wire section, and the bridge portion are disposed in different layers.