Display Substrate Bending Region Touch Signal Routing
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Solution Overview
Problem
In the manufacturing of touch display panels, process defects such as inorganic material residue at adapter holes prevent touch signal traces from being lapped to the metal layer, disrupting touch signal transmission due to close proximity between the inorganic encapsulation layer and adapter holes.
Innovation Solution
A display substrate design featuring first and second connecting leads, touch signal traces, and second connecting leads that penetrate the bending region, with adapter electrodes and organic insulating layers to ensure electrical connectivity and resilience against material residuals, allowing touch signal transmission even with encapsulation layer residuals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the inorganic encapsulation layer is positioned close to the adapter hole to reduce peripheral size, then the screen-to-body ratio is improved, but process defects such as inorganic material residue occur at the adapter hole, causing touch signal transmission failure
Solution Approach 1:
The touch signal trace is divided into two segments: a first sub-touch signal trace in the first subregion and a second sub-touch signal trace in the second subregion. These segments are connected through first and second connecting leads that extend through the bending region, allowing the touch signal to bypass the problematic adapter hole area where inorganic material residue occurs.
Solution Approach 2:
The first and second connecting leads act as intermediary elements that transfer the touch signal from the first sub-touch signal trace to the second sub-touch signal trace through the bending region, avoiding direct connection at the adapter hole location where contamination occurs.
2Device complexity
If the touch signal trace is directly lapped to the metal layer through an adapter hole, then the structure is simplified, but inorganic material residue at the adapter hole blocks the touch signal transmission
Solution Approach 1:
The direct lapping path is segmented into multiple sections with connecting leads routed through the bending region, creating alternative pathways that avoid the contaminated adapter hole while maintaining electrical connectivity for touch signal transmission.
3Reliability
If the inorganic encapsulation layer extends to the first subregion, then the encapsulation coverage is improved, but the proximity to the adapter hole increases the risk of material residue and manufacturing defects
Solution Approach 1:
The touch signal transmission path is segmented to separate the encapsulated first sub-touch signal trace from the non-encapsulated or less-encapsulated second sub-touch signal trace in the bending region, allowing the inorganic encapsulation layer to extend coverage while the connecting leads provide a contamination-free transmission path.
Data Source
AI summary
Provided in the present disclosure are a display substrate and a display device. The display substrate includes: a base substrate, including: a display region and a peripheral region outside the display region, where the peripheral region includes a bending region, a first subregion, and a second subregion; a plurality of first connecting leads, extending from the first subregion to the second subregion through the bending region; an encapsulation layer, located on a side of the plurality of first connecting leads away from the base substrate; a plurality of first touch signal traces, located on a side of the encapsulation layer away from the plurality of first connecting leads; and a plurality of second connecting leads, located between the encapsulation layer and the plurality of first touch signal traces, or located in the same layer as the plurality of first touch signal traces.