Display Substrate Common Electrode Segmentation for Maintenance
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Solution Overview
Problem
Existing display technologies face challenges in maintaining gate lines and data lines due to shorting issues caused by the common electrode metal layer, leading to reduced product yield and inability to effectively address faults through cutting-off or bridging maintenance modes.
Innovation Solution
A display substrate design with a common electrode metal layer featuring metal line segments and connecting line segments that create a hollow area, preventing overlapping with maintenance line segments, allowing for isolation and maintenance of metal line segments without causing shorting, and using metal powder to reconnect disconnected lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode metal layer is designed to increase uniformity of common voltage, then display quality is improved, but maintenance of gate lines and data lines becomes difficult due to shorting issues
Solution Approach 1:
The common electrode metal layer is divided into multiple isolated metal line segments rather than a continuous layer. These segments are separated by insulating layers, allowing individual maintenance of gate lines and data lines without causing shorting between them, while still providing sufficient common voltage coverage for display quality
Solution Approach 2:
Different regions of the common electrode are designed with different properties: metal line segments provide conductive coverage for voltage uniformity, while insulating layers between segments provide isolation for maintenance purposes. This local differentiation allows both display quality and ease of repair to be satisfied in different areas
2Reliability
If a mesh-like common voltage metal layer is designed to solve signal crosstalk and picture greening, then display problems are solved, but product yield decreases due to shorting during maintenance
Solution Approach 1:
The mesh-like common voltage metal layer is segmented into isolated metal line segments separated by insulating layers. This segmentation prevents shorting between gate lines and data lines during maintenance operations, eliminating the yield-reducing failures while preserving the mesh structure's ability to solve crosstalk and picture greening issues
3Reliability
If the common electrode metal layer overlaps with gate lines and data lines, then uniform voltage distribution is achieved, but cutting-off or bridging maintenance modes cause shorting
Solution Approach 1:
The problematic overlapping region is extracted by removing the continuous metal layer and replacing it with isolated metal line segments separated by insulating layers. This extraction eliminates the shorting risk during maintenance while preserving voltage uniformity through the distributed segments
Solution Approach 2:
Insulating layers are introduced as intermediary elements between the metal line segments and the gate lines/data lines. These intermediaries prevent direct electrical contact that would cause shorting, while allowing the metal segments to still provide sufficient voltage distribution
Data Source
AI summary
A display substrate includes: a base substrate, as well as a first metal layer, a first insulating layer, a second metal layer, a second insulating layer, and a common electrode metal layer laminated on one side of the base substrate. The common electrode metal layer includes metal line segments and connecting line segments. The metal line segments include first metal line segments and second metal line segments. The connecting line segments connect the adjacent first and second metal line segments. Each connecting line segment is provided with a maintenance line segment. Orthographic projections of the maintenance line segments on the base substrate do not overlap those of gate lines and data lines on the base substrate. The spacing between the orthographic projections of the maintenance line segments and those of the gate lines and data lines is greater than or equal to a preset distance, which is greater than zero.