Array Substrate Dual-Via Connection for LCD Grayscale Dark Spots
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Solution Overview
Problem
Existing TFT liquid crystal display panels suffer from grayscale dark spots due to breakage or poor quality at the connection points between the ITO film and metal electrode layers, leading to poor connection and display issues.
Innovation Solution
The proposed solution involves an array substrate with a thin film transistor layer, a passivation layer with strategically placed first and second via holes, and a pixel electrode layer connected to the first conductive layer through these via holes, ensuring a robust electrical connection and preventing grayscale dark spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single via hole is used to connect the ITO film to the metal electrode layer, then the manufacturing process is simple, but the connection reliability is poor and grayscale dark spots appear
Solution Approach 1:
The single via hole connection structure is segmented into multiple via holes (first via hole and second via hole) arranged in parallel. This segmentation distributes the electrical connection load across multiple pathways, preventing single-point failure and eliminating grayscale dark spots caused by connection breakage, thereby improving connection reliability without significantly complicating the manufacturing process.
2Reliability
If the ITO film connection point is made robust, then connection reliability improves, but the manufacturing complexity increases
Solution Approach 1:
Instead of attempting to make a single connection point more robust through material or structural changes, the solution segments the connection into multiple parallel via holes. This approach achieves improved reliability through redundancy rather than through complex manufacturing processes, maintaining ease of manufacture while eliminating connection failures.
3Reliability
If multiple via holes are used to connect the pixel electrode to the first conductive layer, then connection reliability improves and grayscale dark spots are prevented, but the passivation layer structure becomes more complex
Solution Approach 1:
The passivation layer is segmented to include multiple via holes (first via hole and second via hole) that penetrate through it to establish parallel electrical connections. This segmentation creates redundant connection pathways that prevent grayscale dark spots while maintaining a relatively simple passivation layer structure that can be formed using standard manufacturing processes.
Data Source
AI summary
An array substrate, a display panel, and a manufacturing method of the array substrate are provided, including a thin film transistor layer, a passivation layer, and a pixel electrode layer which are sequentially disposed on one above another. The passivation layer is provided with a first via hole and a second via hole staggered from each other. The pixel electrode layer includes a pixel electrode connected to a first conductive layer through the first via hole and the second via hole. Therefore, a problem of grayscale dark spots caused by the pixel electrode being broken at a connection point with the first conductive layer is avoided.