Touch Electrode Lead Layout for Lower RC Loading in Foldable Displays
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Solution Overview
Problem
Existing touch display technologies face challenges in reducing signal attenuation and improving the signal-to-noise ratio of active styluses due to RC loading on touch leads, particularly in flexible and foldable OLED display apparatuses.
Innovation Solution
The touch display panel design includes a touch electrode layer with multiple touch electrodes and leads that are routed to opposite binding regions through bending regions, reducing RC loading by leading touch leads from both ends of each electrode, and utilizing double-end leads to enhance signal uniformity and reduce attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch leads are routed from both ends of each electrode to opposite binding regions, then signal attenuation is reduced and signal-to-noise ratio is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The touch lead routing is segmented into multiple paths, with some leads extending to the first binding region and others to the second binding region. This segmentation allows optimization of signal paths by distributing leads across different routing zones, reducing RC loading and improving signal-to-noise ratio while managing complexity through organized regional distribution.
Solution Approach 2:
The patent utilizes the spatial dimension by routing leads to opposite binding regions on both sides of the touch display panel. This dimensional approach distributes the electrical connections in space rather than concentrating them in one area, reducing signal attenuation and interference while maintaining manageable device complexity through three-dimensional lead arrangement.
2Reliability
If touch leads are extended to reduce RC loading, then signal attenuation is reduced, but the length of leads increases which may increase manufacturing complexity
Solution Approach 1:
The lead routing is divided into segments that extend to opposite binding regions, allowing the total lead length to be optimized by distributing connections across multiple shorter paths rather than using single long leads. This segmentation reduces RC loading while controlling overall lead length and manufacturing complexity.
Solution Approach 2:
By routing leads to opposite binding regions on both sides of the panel, the patent utilizes spatial dimensionality to create more direct signal paths. This dimensional approach reduces the effective lead length required for signal transmission compared to routing all leads to a single binding region, thereby reducing signal attenuation without excessive lead length.
Data Source
AI summary
Embodiments of the present disclosure provide a touch substrate, a touch display panel and a touch display apparatus. The touch display panel includes: a base substrate; a touch electrode layer on the base substrate and in a touch display region, the touch electrode layer including touch electrodes in the same layer and insulated from each other; and touch leads on the base substrate, each touch lead is electrically connected to a corresponding one touch electrode, some touch leads extend from the touch display region through the first bending region to the first binding region, and are bent to the back of the touch display panel in the first bending region, and the other touch leads extend from the touch display region through the second bending region to the second binding region, and are bent to the back of the touch display panel in the second bending region.