Array Substrate Common Electrode Segmentation for Display Defect Reduction
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Solution Overview
Problem
Large-size LCDs face defects such as horizontal and vertical lines due to a relatively large overlapped area between the common electrode and the black matrix, leading to coupling capacitance and light leakage issues.
Innovation Solution
The array substrate design includes a common electrode connected with adjacent sub-pixels through a common connection portion, with a specific overlapped region between the common connection portion and the gate line, reducing the overlapped area between the common electrode and the black matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode and black matrix have a large overlapped area, then the common electrode can provide sufficient coverage, but coupling capacitance increases causing horizontal and vertical line defects
Solution Approach 1:
The common electrode is divided into multiple segments (first common electrode, second common electrode, third common electrode) that are spatially separated. This segmentation reduces the overlapped area between the common electrode and black matrix, thereby reducing coupling capacitance while maintaining display coverage through the segmented structure.
Solution Approach 2:
The patent applies different configurations to different regions of the common electrode. In regions where the common electrode overlaps with the black matrix, the structure is modified (e.g., reducing overlap area or changing geometry) to minimize coupling capacitance, while other regions maintain standard configuration for optimal display performance.
2Device complexity
If the common electrode and black matrix have a large overlapped area, then the common electrode structure is simplified, but light leakage occurs during startup L0 state
Solution Approach 1:
By segmenting the common electrode into multiple separate electrodes, the patent reduces the continuous overlapped area with the black matrix that would otherwise create light leakage paths during startup. The segmented structure breaks up the continuous coupling path while maintaining electrical functionality.
Solution Approach 2:
The patent converts the potentially harmful large overlapped area into a beneficial segmented structure. The segmentation creates multiple smaller overlap regions instead of one large region, which reduces coupling capacitance and light leakage while maintaining the necessary electrode coverage and functionality.
3Object-generated harmful factors
If the first width of the overlapped region is reduced, then coupling capacitance decreases, but the common connection portion size is constrained
Solution Approach 1:
The patent applies different width characteristics to different parts of the common connection portion. The first width (in the first direction) is reduced to minimize coupling capacitance, while the second width (in the second direction) is maintained or optimized to ensure adequate connection area and electrical performance.
Solution Approach 2:
The common connection portion is designed with asymmetric dimensions where the first width is specifically reduced compared to the second width. This asymmetric configuration allows the structure to minimize coupling capacitance in the critical first direction while maintaining sufficient connection area in the second direction through the relationship between the two width dimensions.
Data Source
AI summary
The present disclosure provides an array substrate and a manufacturing method thereof, and a display apparatus. The array substrate includes a plurality of gate lines (20) and a plurality of data lines (50) disposed on a base substrate (11), the plurality of gate lines (20) extend along a first direction, the plurality of data lines (50) extend in a second direction, the plurality of gate lines (20) and the plurality of data lines (50) are intersected to define a plurality of sub-pixels, the sub-pixel includes a thin film transistor (10), a pixel electrode (80) and a common electrode (90), the common electrode (90) in one sub-pixel is connected with the common electrode (90) in the adjacent sub-pixel through a common connection portion (110).