FFS Array Substrate Metal Common Electrode Signal Lines
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Solution Overview
Problem
In fringe field switching (FFS) mode liquid crystal display panels, common electrodes made of indium tin oxide (ITO) have high resistance and poor resistance uniformity, leading to non-uniform voltage distribution and defects such as residual images.
Innovation Solution
The array substrate design includes common electrode signal line units with both a first common electrode signal line perpendicular and a second parallel to the gate signal line, both made of metal, which cross and are electrically connected, along with a bridge line connecting adjacent units, reducing resistance and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common electrodes are made of ITO, then the electrodes can be formed transparently, but the resistance becomes high and resistance uniformity deteriorates
Solution Approach 1:
The patent uses a composite structure combining ITO layer with metal patterned layers (Aluminum, Mo, or W). The ITO provides transparency while the metal patterns provide low resistance pathways, creating a composite conductive system that achieves both transparency and low resistance with improved uniformity
Solution Approach 2:
The common electrode is segmented into multiple regions with metal patterns (first, second, third patterns) distributed across different areas. This segmentation allows different portions to contribute differently to resistance distribution, improving overall resistance uniformity while maintaining transparency through the ITO base layer
2Device complexity
If bridge line is made of ITO, then it can be in the same layer as pixel electrode, but the resistance becomes high
Solution Approach 1:
The bridge line is constructed as a composite structure combining ITO with metal patterns (Aluminum, Mo, or W). This composite approach maintains the single-layer integration with pixel electrodes while significantly reducing resistance through the low-resistance metal components
Solution Approach 2:
The bridge line merges ITO and metal patterns into a unified conductive structure within the same layer. This merging allows the structure to benefit from both materials: ITO for transparency and integration, metal for low resistance, achieving both structural simplicity and electrical performance
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 reduces the resistance of the common electrode in the direction perpendicular to the gate signal line, decreases voltage distribution gradients, and enhances image display quality by ensuring uniform resistance and improved signal distribution.
Implementation Method 1
each of the common electrode signal line units comprises a first common electrode signal line perpendicular to the gate signal line and a second common electrode signal line parallel to the gate signal line; wherein the first common electrode signal line and the second common electrode signal line both are made of metal
Data Source
AI summary
An array substrate is disclosed. The array substrate comprises a substrate, a plurality of common electrodes formed on the substrate, a plurality of gate signal lines formed above the common electrodes, and a plurality of common electrode signal line units corresponding to the plurality of common electrodes, respectively. The plurality of common electrode signal line units are formed on the corresponding common electrodes, respectively. Each of the common electrode signal line units comprises a first common electrode signal line perpendicular to the gate signal line and a second common electrode signal line parallel to the gate signal line. The first and second common electrode signal lines are made of metal and cross with each other and are electrically connected to each other. Two adjacent common electrode signal line units are electrically connected by a bridge line. The present disclosure also relates to a method for manufacturing the array substrate and a display apparatus.