Touch Fan-Out Layout for Narrow-Bezel Display Panels
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Solution Overview
Problem
Conventional self-capacitance touch solutions in display panels significantly increase the bezel width, making it difficult to achieve a narrow bezel design due to the large space occupied by channel wires in the non-display area.
Innovation Solution
The touch leading wires are divided into at least two fan-out routing areas, with each area densely arranged to ensure insulation and minimize the total space occupied, thereby reducing the width of the bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a self-capacitance touch solution is used, then the touch function is implemented, but the bezel width is significantly increased due to the large number of channel wires
Solution Approach 1:
The patent divides the non-display area into multiple fan-out routing areas, with each area containing a subset of the touch leading wires. This segmentation allows the wires to be distributed across different regions, reducing the concentration of wires in any single area and thereby reducing the overall bezel width while maintaining the complete touch functionality.
2Length of stationary object
If channel wires are densely arranged to reduce space, then bezel width is reduced, but insulation between adjacent wires becomes difficult to ensure
Solution Approach 1:
The patent utilizes multiple metal layers to route the touch leading wires. By distributing wires across different vertical layers (Z-dimension) rather than only in the planar direction, the design achieves dense packing while maintaining adequate insulation distance through the layer separation, thus reducing bezel width without compromising wire insulation reliability.
3Length of stationary object
If the number of touch leading wires is reduced in each fan-shaped area, then the width occupied by fan-shaped areas is reduced, but the total number of wires must be maintained
Solution Approach 1:
The patent segments the complete set of touch leading wires into multiple groups, with each group routed through a separate fan-out routing area. This segmentation enables the total wire count to be maintained while distributing them across multiple smaller areas, reducing the width required for each individual fan-shaped area and thereby reducing the overall bezel width.
Solution Approach 2:
The patent combines multiple fan-out routing areas into a single integrated structure within the non-display area. By merging these areas and their contained wire groups into a unified layout, the design achieves space optimization while maintaining all necessary touch leading wire connections, thus reducing bezel width without losing functionality.
Data Source
Figure 1
Figure 2~3(b)
Figure 4(c)~4(g)
AI summary
Embodiments of this application provide a display panel and an electronic device. The display panel includes a display area and a non-display area. The display area includes a touch electrode array consisting of a plurality of touch electrodes, and a plurality of touch signal wires, and the non-display area includes at least two fan-out routing areas. The at least two fan-out routing areas are arranged along a first boundary between the non-display area and the display area, and each fan-out routing area includes a plurality of touch leading wires. The fan-out routing area includes a fan-shaped area and a straight line area, and the fan-shaped area is located between the first boundary and the straight line area. Each touch leading wire includes a first sub-leading wire located in the fan-shaped area and a second sub-leading wire located in the straight line area. A distance between two second sub-leading wires that are adjacent and that are located in different straight line areas is a first distance, a distance between two second sub-leading wires that are adjacent and that are located in a same straight line area is a second distance, and the first distance is greater than the second distance. In this application, a bezel width occupied by the fan-shaped area formed by the touch leading wires can be reduced to narrow a bezel.