Transparent Shielding Line Layout for LCD Data Line Capacitance
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Solution Overview
Problem
In liquid crystal display (LCD) panels, the use of a transparent shielding electrode line to replace the data shielding line increases parasitic capacitance between the transparent shielding electrode line and the data line, leading to increased capacitive load and reduced charging efficiency.
Innovation Solution
The array substrate design includes a shielding line with a first shielding line in the same layer as the pixel electrode and a second shielding line between the data line and the first shielding line, where the second shielding line is transparent and in a different layer, allowing for reduced vertical interlayer distance to the data line, thereby minimizing parasitic capacitance and improving charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a transparent shielding electrode line is used to replace the data shielding line, then the penetration rate of the pixel electrode is improved, but the parasitic capacitance between the shielding line and the data line increases
Solution Approach 1:
The shielding line is divided into two segments: a first shielding line in the same layer as the pixel electrode and a second shielding line in a different layer between the data line and the first shielding line. This segmentation allows the shielding function to be distributed across multiple layers, reducing the parasitic capacitance while maintaining the pixel electrode penetration rate.
Solution Approach 2:
The shielding structure transitions from a single-layer configuration to a multi-layer configuration by adding the second shielding line in a different layer. This dimensional change in the vertical direction reduces the horizontal distance between the shielding line and the data line, thereby reducing parasitic capacitance while preserving the pixel electrode area.
2Area of stationary object
If the transparent shielding electrode line is positioned farther from the data line, then the pixel electrode area can be increased, but the capacitive load of the data line increases
Solution Approach 1:
The shielding line is segmented into two parts at different vertical levels. The second shielding line is positioned closer to the data line in a lower layer, while the first shielding line is in the same layer as the pixel electrode. This segmentation enables the pixel electrode to extend closer to the data line, increasing its area, while the second shielding line maintains a smaller vertical distance to reduce capacitive load.
Solution Approach 2:
The second shielding line acts as an intermediary structure between the data line and the first shielding line. It is positioned in an intermediate layer closer to the data line, serving as a mediator that reduces the capacitive coupling between the shielding structure and the data line, thereby reducing the overall capacitive load while allowing the pixel electrode to have larger area.
Data Source
AI summary
An array substrate and a display panel are provided. The array substrate includes a substrate, a common electrode line, a data line, a pixel electrode, and a shielding line. The common electrode line is disposed on the substrate. The data line is disposed on the common electrode line. The pixel electrode is disposed on the data line. The shielding line is disposed on the data line and includes a first shielding line and a second shielding line connected. The first shielding line and the pixel electrode are disposed in a same layer, and the second shielding line is disposed between the first shielding line and the data line. An orthographic projection of the first shielding line and the second shielding line on the substrate covers an orthographic projection of the data line on the substrate.