Touch Display Pad Layout to Prevent Cross-Line Signal Defects
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Solution Overview
Problem
The arrangement of signal lines in touch display devices often results in impedance mismatch and electrostatic damage due to cross-line designs between the active and peripheral regions, which are not efficiently addressed in current technologies.
Innovation Solution
The implementation of a substrate design with first and second pads in the peripheral region, along with redundancy pads, ensures that data and touch signals are transmitted without cross-line connections, reducing impedance mismatch and electrostatic damage by arranging signal types in the same order and using non-overlapping fan-out lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cross-line design is used to connect signal lines in active region to signal output terminals in peripheral region, then electrical connection can be achieved, but impedance mismatch and electrostatic damage occur
Solution Approach 1:
The invention segments the signal transmission path by introducing intermediate buffer pads between the signal lines and output terminals. These buffer pads divide the direct cross-line connection into multiple shorter segments, reducing the harmful effects of impedance mismatch and electrostatic damage while maintaining electrical connectivity.
Solution Approach 2:
The invention introduces redundancy pads as intermediary elements between the signal lines and output terminals. These intermediary pads act as buffer zones that mediate the electrical connection, preventing direct exposure to impedance mismatch and electrostatic damage while enabling signal transmission.
2Adaptability or versatility
If signal lines are arranged differently in active and peripheral regions, then functional requirements can be met, but cross-line design becomes necessary causing defects
Solution Approach 1:
The invention performs preliminary arrangement of signal lines in the active region according to functional requirements, then uses redundancy pads in the peripheral region to pre-establish connection points. This preliminary action allows flexible signal line arrangement while preventing the need for harmful cross-line designs during final connection.
Solution Approach 2:
The invention resolves the arrangement conflict by transitioning from a two-dimensional planar connection to a multi-dimensional structure using stacked pads and vertical connections. This dimensional change allows signal lines to connect to output terminals without crossing, maintaining both arrangement flexibility and signal transmission quality.
Data Source
AI summary
An electronic device is provided, which includes: a substrate including a periphery region; a plurality of first pads disposed on the substrate and in the periphery region; a plurality of second pads disposed on the substrate and in the periphery region; and a plurality of redundancy pads disposed on the substrate and in the periphery region, wherein the plurality of first pads are configured to transmit a plurality of data signals, the plurality of second pads are configured to transmit a plurality of signals which are different from the plurality of data signals and a plurality of touch signals, and the plurality of first pads and the plurality of redundancy pads are disposed between two of the plurality of second pads.