Touch Display Panel Crack Detection Line ESD Protection
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Solution Overview
Problem
The existing design of Panel Crack Detection (PCD) circuits in flexible multilayer on-cell (FMLOC) touch display panels is prone to defects during electrostatic discharge (ESD) tests, leading to issues like bright or dark lines due to damage to the PCD line and subsequent electrical component damage.
Innovation Solution
The design incorporates a group of wires in the lower frame area with a trace part and a crack detection part, where the maximum distance between them is less than 10 times the width of the trace part, along with additional features like a guard line, ground line, and dummy trace line, all with the same line width and distance, to reduce ESD-related defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PCD line is disposed separately from the trace line in the lower frame area, then the crack detection function is provided, but the PCD line is prone to ESD damage causing bright or dark lines
Solution Approach 1:
The patent merges the PCD line with the trace line by disposing them in the same layer and positioning them adjacent to each other in the lower frame area. This integration allows the trace line to serve as a shield for the PCD line, protecting it from ESD damage while maintaining crack detection functionality. The merged configuration ensures that both lines benefit from the protective effect of the trace line's connection to the common electrode.
Solution Approach 2:
The patent introduces a bending region as an intermediary element between the PCD line and the active area. This bending region allows the PCD line to extend from the active area through the lower frame area to the common electrode while maintaining flexibility and reducing stress concentration. The intermediary bending region helps distribute mechanical stress and protects the PCD line from direct exposure to ESD events in the active area.
2Reliability
If the PCD line extends through the bending region to the common electrode, then the ESD protection is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent makes the PCD line multi-functional by having it serve both as a crack detection line and as an ESD protection path. The same conductive line structure is used to detect cracks in the encapsulation layer while simultaneously providing a low-impedance path for ESD current to reach the common electrode. This universal design eliminates the need for separate ESD protection structures, simplifying manufacturing.
Solution Approach 2:
The patent segments the PCD line into multiple portions: a first portion in the active area, a second portion in the lower frame area, and a third portion connected to the common electrode. This segmentation allows each portion to be optimized for its specific function while maintaining continuity for ESD protection. The segmented approach also facilitates easier manufacturing by allowing standard FMLOC processes to be used for each segment.
3Reliability
If the trace line and PCD line are in the same layer, then the ESD shielding effect is enhanced, but the risk of mutual interference increases
Solution Approach 1:
The patent connects both the trace line and PCD line to the common electrode, creating an equipotential configuration. By tying both lines to the same reference potential (the common electrode), the voltage difference between them is minimized, reducing electrical interference and capacitive coupling effects. This equipotential design allows the lines to be disposed close together in the same layer without significant mutual interference.
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 configuration significantly reduces the occurrence of defects after ESD tests, as the trace part shares ESD shock and the dummy trace line bears electrostatic discharge, protecting internal lines and maintaining panel integrity.
Implementation Method 1
the trace part shares ESD shock and the dummy trace line bears electrostatic discharge, protecting internal lines
Data Source
AI summary
The present disclosure provides a touch display panel, in which a touch layer comprises a trace line and a crack detection line. There is a group of wires in a first direction in a lower frame area of the touch display panel, wherein the group of wires in the first direction comprises a trace part which is a portion of trace line extending in the first direction and a first crack detection part which is a portion of the crack detection line extending in the first direction; wherein a maximum distance between the first crack detection part and the trace part is less than 10 times a width of the trace part in a direction perpendicular to its extending direction.