Array Substrate Electrode Edge Protection Against Anode Over-Etching
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Solution Overview
Problem
The existing display panel technologies face issues with over-etching of the anode during the preparation process, leading to reduced displaying effect and potential short circuits due to the anode's small size and hole-transport ability, which affects the brightness and causes dark spots on the display panel.
Innovation Solution
An array substrate is designed with a protection member at the edge of the first electrode, where the orthogonal projection of the protection member overlaps with the first conductive line, reducing contact between the etching solvent and the electrode, thereby minimizing over-etching and maintaining the electrode's size and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the anode is prepared in the light-transmitting region without protection, then the etching process can be completed, but over-etching occurs causing the anode size to be reduced and affecting display quality
Solution Approach 1:
The patent applies preliminary action by forming a protection member (pixel definition layer) before the etching process. This layer is prepared in advance to prevent over-etching of the anode, ensuring precise size control without complicating the etching process itself. The protection member is removed after serving its protective function during etching.
Solution Approach 2:
The protection member acts as an intermediary between the etching solvent and the anode. It temporarily introduces this intermediate layer to mediate the interaction during etching, preventing direct excessive contact between the solvent and anode edge, thereby controlling anode dimensions while maintaining process simplicity.
2Reliability
If the anode size is reduced due to over-etching, then the etching process appears complete, but the hole-transport ability decreases causing dark spots and affecting display brightness
Solution Approach 1:
The protection member is prepared in advance before etching to prevent excessive material loss. By having this protective layer in place beforehand, the anode material is protected from over-etching, maintaining adequate anode size and hole-transport ability, thus preventing dark spots and ensuring display brightness and quality.
3Manufacturing precision
If no protection member is used during etching, then the manufacturing process is simpler, but the anode edge becomes unstable and prone to over-etching
Solution Approach 1:
The pixel definition layer is formed as a preliminary protective structure before the etching process. This pre-prepared protection member stabilizes the anode edge during etching, preventing over-etching and ensuring manufacturing precision. The temporary structure is removed after serving its protective purpose, maintaining overall structural simplicity.
Solution Approach 2:
The protection member serves as an intermediary structure that temporarily increases device complexity only when needed during the etching process. It provides edge stability and prevents over-etching, then is removed afterward, so the final device structure remains simple without permanent additional components.
Data Source
AI summary
An array substrate and a display panel, the array substrate includes an array layer, and a first conductive line and a first electrode that are disposed on the array layer, and the first electrode is electrically connected with the array layer via the first conductive line; a protection member is disposed at an edge of the first electrode, and an orthogonal projection of the protection member on the array layer at least partially overlaps with an orthogonal projection of the first conductive line on the array layer.