Touch Panel Detection Line Layout to Prevent FMLOC Short Circuits
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Solution Overview
Problem
The existing touch control structures in flexible multi-layer on cell (FMLOC) technology face issues of short circuits and metal residue at the boundary of the organic layer due to overlapping metal layers, leading to defects in crack detection and ground wire functionality.
Innovation Solution
The design separates the first and second detection lines into different metal layers with an insulation layer in between, and adjusts the common signal lines and touch electrode lead wires to prevent short circuits by ensuring they are partially or fully in separate layers, with specific distances and connections to minimize metal residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If overlapping metal layers are used in touch control structures, then multi-point-touch functionality and shadow elimination are achieved, but short circuits and metal residue occur at the organic layer boundary
Solution Approach 1:
The detection lines are segmented into different metal layers (first detection line in second metal layer, second detection line in first metal layer) with an insulation layer between them. This segmentation prevents the overlapping metal layers from causing short circuits while maintaining the multi-point-touch functionality through capacitive coupling between the separated layers.
Solution Approach 2:
An insulation layer is introduced as an intermediary between the first and second metal layers containing the detection lines. This intermediary prevents direct electrical contact and short circuits between the overlapping metal layers, while still allowing the capacitive coupling necessary for touch detection to function.
2Measurement precision
If multiple metal layers are stacked for detection lines, then touch accuracy is improved, but manufacturing complexity increases due to precise layer alignment requirements
Solution Approach 1:
The detection lines are arranged in different vertical layers (first detection line in second metal layer, second detection line in first metal layer) rather than overlapping in the same plane. This dimensional separation maintains the precision needed for touch accuracy while simplifying manufacturing by reducing the alignment complexity between overlapping patterns.
3Reliability
If detection lines are arranged in separate layers with insulation, then short circuits are prevented, but the structure complexity increases
Solution Approach 1:
The insulation layer is merged into the existing multi-layer structure as a standard component between the first and second metal layers. This integration provides electrical insulation and short circuit prevention while maintaining a compact structure that does not significantly increase overall device complexity.
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 structure effectively prevents short circuits and maintains the integrity of crack detection and ground wire functions, enhancing the reliability and functionality of the touch control system.
Implementation Method 1
the insulation layer is further arranged between the two different layer structures, so that even if the material of the first metal layer or the material of the second metal layer remains at the boundary of the organic layer, the problem of short circuit caused by the electrical communication between the first detection line and the second detection line cannot occur
Implementation Method 2
the first detection part is electrically connected with the second detection part through a first via structure penetrating through the insulation layer
Data Source
AI summary
A touch control structure, a touch display panel and an electronic device are provided. The touch control structure includes a first metal layer, an insulation layer and a second metal layer that are sequentially stacked on the base substrate, the touch control structure is divided into a touch region and a peripheral region surrounding the touch region, and the peripheral region includes a first detection line and a second detection line that are sequentially arranged and spaced apart from each other along the direction from the touch region to the peripheral region; the first detection line is in the second metal layer, and the overlapping part of the second detection line is in the first metal layer; the first end of the second detection line includes a first detection part in the second metal layer and a second detection part in the first metal layer.