Touch Grid Electrode Overlap Structure to Prevent Short Circuits
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Solution Overview
Problem
Existing touch structures in display devices are prone to short circuits due to breakage at edge slope parts of the insulating layer, affecting the reliability and sensitivity of the touch function.
Innovation Solution
A touch structure design featuring a first metal grid electrode layer and a second metal grid electrode layer with an insulating layer in between, where the first metal lines and second metal lines have overlapping portions covered by edge slope parts that form steps, reducing the likelihood of short circuits and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer is designed with edge slope parts to cover overlapping metal lines, then short circuit prevention is improved, but manufacturing complexity increases due to step formation
Solution Approach 1:
The insulating layer is designed with pre-formed edge slope parts that protrude toward the first metal grid electrode layer before the metal lines are deposited. This preliminary structuring ensures that when the metal lines are later formed, the edge slope parts automatically cover the overlapping regions, preventing short circuits without requiring complex post-processing steps.
Solution Approach 2:
The edge slope parts of the insulating layer serve as an intermediary protective element between the first and second metal grid electrode layers. These protruding insulating structures act as physical barriers that prevent direct contact between overlapping metal lines, thereby mediating the potential short circuit issue while maintaining the layered structure's integrity.
2Measurement precision
If the first metal lines are positioned to overlap with second metal lines under edge slope parts, then sensitivity is improved through better electrode coupling, but reliability deteriorates due to increased short circuit risk
Solution Approach 1:
The edge slope parts of the insulating layer serve as an intermediary protective element between the first and second metal grid electrode layers. These protruding insulating structures act as physical barriers that prevent direct contact between overlapping metal lines, thereby mediating the potential short circuit issue while maintaining the layered structure's integrity.
Solution Approach 2:
The insulating layer is designed with non-uniform thickness, featuring edge slope parts that locally protrude in specific regions where metal line overlapping occurs. This localized thickening provides targeted protection at critical overlapping zones while maintaining the original insulating layer thickness in other regions, thus preserving touch sensitivity where protection is not needed.
3Reliability
If the insulating layer edge slope parts are made to protrude further, then short circuit protection is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layer is designed with pre-formed edge slope parts that protrude toward the first metal grid electrode layer before the metal lines are deposited. This preliminary structuring ensures that when the metal lines are later formed, the edge slope parts automatically cover the overlapping regions, preventing short circuits without requiring complex post-processing steps.
Data Source
AI summary
A touch structure, a touch display panel, and a display device are provided. The touch structure includes a substrate and a first metal grid electrode layer, an insulating layer, a second metal grid electrode layer on the substrate. The first metal grid electrode layer is on a side of the second metal grid electrode layer away from the substrate; the first metal grid electrode layer includes a plurality of first metal grids formed by a plurality of first metal lines, the second metal grid electrode layer includes a plurality of second metal grids formed by a plurality of second metal lines, first portions of the plurality of the first metal lines and second portions of the plurality of the second metal lines have same line extension directions, respectively, and overlap with each other in a direction perpendicular to a surface of the substrate.