Array Substrate with Segmented Common Electrodes for LCD
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Solution Overview
Problem
In liquid crystal display technology, the overlapping capacitor between data lines and common electrodes causes a greenish phenomenon at high driving frequencies, which is difficult to overcome even with switching virtual circuits.
Innovation Solution
The array substrate design includes independently powered first and second common electrodes, where the projection of the first common electrode shields the data line, and the second common electrode is positioned to avoid overlap with the data line, ensuring normal capacitance and reducing the greenish effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single common electrode is used with overlapping capacitor between data line and common electrode, then the charging time is short, but the voltage of common electrode is influenced causing greenish phenomenon at high driving frequencies
Solution Approach 1:
The common electrode is divided into two independent parts: a first common electrode that overlaps with the data line to provide charging capacitance, and a second common electrode that does not overlap with the data line to avoid voltage influence. This segmentation allows the electrode to simultaneously provide fast charging while maintaining voltage stability at high driving frequencies.
Solution Approach 2:
Different regions of the common electrode are given different properties: the first common electrode region is designed to overlap with the data line for efficient charging, while the second common electrode region is positioned to avoid overlap and voltage interference. This local differentiation resolves the contradiction between charging speed and voltage stability.
2Reliability
If the second common electrode is positioned to avoid overlapping the data line, then the greenish phenomenon is reduced, but the overlapping capacitor between data line and common electrode is eliminated
Solution Approach 1:
The common electrode is segmented into two functional regions: the first common electrode maintains overlap with the data line to preserve charging capacitance and speed, while the second common electrode avoids overlap to ensure voltage stability. This segmentation allows both charging efficiency and voltage stability to coexist.
Solution Approach 2:
The first and second common electrodes are combined into a single common electrode structure that is powered independently. This merging allows the system to benefit from both the overlapping region (for fast charging) and the non-overlapping region (for voltage stability) simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design significantly reduces the greenish phenomenon at high frequencies by avoiding the overlapping capacitor, allowing for effective high-frequency operation and meeting charge rate requirements.
Implementation Method 1
a projection of the first common electrode onto a layer where the data lines are located covers the data line
Data Source
AI summary
The present invention provides an array substrate, its manufacturing method, and a display device. The array substrate comprises a plurality of grid lines a plurality of data lines, and pixel regions defined by every two adjacent grid Fines and every two adjacent data lines. The pixel region is provided with a common electrode, a pixel electrode and a thin film transistor. The common electrode includes a first common electrode and a second common electrode which are powered independently. A projection of the first common electrode onto a layer where the data lines are located covers the data line, and a projection of the second common electrode onto a layer where the pixel electrode is located falls on the pixel electrode.