Touch Display Panel Layered Routing for FMLOC Short-Circuit Prevention
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Solution Overview
Problem
Flexible display panels using FMLOC technology are prone to large-area short-circuiting due to abnormal contact between the touch signal line and trace, which is exacerbated by manufacturing anomalies and bending.
Innovation Solution
The touch display panel design includes a touch connection line that overlaps with the trace's edge, shortening the touch signal line length and using switching lines to electrically connect with the touch signal line, thereby avoiding abnormal contact and short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch signal line is extended to connect with the trace in FMLOC technology, then the electrical connection is improved, but the anti-bending capability deteriorates and short-circuiting risk increases
Solution Approach 1:
The patent introduces a vertical stacking dimension by placing the touch connection line in a different layer from the trace, using the Z-axis (perpendicular direction) to resolve the horizontal conflict between connection length and bending stress. This layered architecture allows the touch signal line to connect to the trace vertically rather than extending horizontally, reducing the signal line length while maintaining electrical connectivity.
Solution Approach 2:
The touch connection line acts as an intermediary element that bridges the touch signal line and the trace in a different layer. Instead of directly extending the touch signal line to contact the trace, the connection line serves as a mediator that transfers the signal vertically, reducing the exposure of the touch signal line to bending stresses in the horizontal plane.
2Reliability
If the touch signal line is lengthened to ensure electrical connection, then the connection reliability is improved, but the risk of abnormal contact with trace increases
Solution Approach 1:
By moving the connection path to a different layer (vertical dimension), the patent eliminates the spatial overlap between the touch signal line and trace in the horizontal plane. This dimensional separation prevents abnormal contact while maintaining reliable electrical connection through the vertical connection line.
Solution Approach 2:
The touch connection line in a different layer serves as an intermediary that provides a controlled connection path between the touch signal line and trace. This mediator approach ensures that the connection is established through a dedicated route that avoids unintended contact with the trace, preventing short-circuiting.
3Strength
If the touch signal line is shortened by overlapping with trace edge, then the anti-bending capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the electrical connection function into two parts: the touch signal line in one layer and the touch connection line in another layer. This segmentation allows each component to be optimized independently - the signal line for anti-bending capability and the connection line for precise alignment with the trace, reducing overall manufacturing complexity.
Solution Approach 2:
By implementing the connection in a different layer, the patent transforms the alignment problem from a two-dimensional horizontal alignment into a three-dimensional alignment task. This allows the touch connection line to be precisely positioned relative to the trace edge in the vertical dimension, reducing the precision requirements for horizontal alignment and enabling shorter signal lines.
Data Source
AI summary
The present disclosure relates to a touch display panel and a display apparatus. The touch display panel includes a touch region and a switching region, where the touch region provided with a light-emitting structure is adjacent to the switching region. The touch display panel includes: a substrate, a trace where at least part of the trace is located in the switching region on the substrate, a touch signal line, located at a side of the trace away from the substrate, and a touch connection line, electrically connected with the touch signal line and disposed in a different layer from the trace and the touch signal line. In a direction perpendicular to the substrate, the touch connection line is overlapped with at least partial edge of the trace. According to the embodiments of the present disclosure, large-area short-circuiting on the display panel can be avoided.