Touch Substrate Lead Wire Routing for Narrow Bezel Displays
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Solution Overview
Problem
Existing display panels with integrated touch regions have reduced area proportions due to black frames on both sides of the touch regions, limiting the effective use of space.
Innovation Solution
A touch substrate design with a touch region and a binding region arranged along a first direction, featuring first and second touch electrodes and lead wires, where at least one lead wire is located in the touch region to maximize space utilization, reducing the non-touch region area and enhancing the touch region's area proportion, thereby achieving narrow bezels without frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black frames are added on both sides of touch regions, then structural stability and signal transmission are improved, but the area proportion of touch regions is reduced
Solution Approach 1:
The patent transitions lead wires from a planar arrangement (where they would occupy horizontal space creating black frames) to a three-dimensional arrangement using multiple layers. Lead wires are distributed across different layers (first lead wires in the first layer, second lead wires in the second layer), allowing them to connect touch electrodes without projecting onto the same plane, thereby eliminating the need for black frames while maintaining signal transmission stability
Solution Approach 2:
The patent segments the lead wire system into multiple independent groups: first lead wires connecting first touch electrodes, second lead wires connecting second touch electrodes, third lead wires connecting third touch electrodes, and fourth lead wires connecting fourth touch electrodes. Each group operates in its own spatial domain (different layers), allowing independent routing that maximizes touch region utilization while ensuring reliable signal transmission for each electrode group
2Reliability
If lead wires are arranged outside the touch region, then signal transmission is stable, but the area proportion of touch regions is reduced
Solution Approach 1:
The patent utilizes the vertical dimension by stacking multiple layers. Lead wires are arranged in the second direction (vertical stacking) rather than the first direction (horizontal arrangement). This allows lead wires to be positioned above or below touch electrodes in different layers, enabling signal transmission without occupying horizontal touch region space, thus achieving both stable signal transmission and maximum touch region area proportion
3Area of stationary object
If multiple layers of lead wires are used, then the area proportion of touch regions is increased, but device complexity increases
Solution Approach 1:
The patent employs a uniform layer structure where each layer contains the same types of components (touch electrodes, lead wires, insulating layers, planarization layers). This modular, repetitive design reduces the complexity of manufacturing and assembly, as the same processes can be applied to each layer. The multi-layer structure achieves high touch region area proportion while keeping device complexity manageable through standardized, scalable layer design
Data Source
AI summary
A touch substrate and a display panel are disclosed. The touch substrate includes a touch region and a binding region, and the touch substrate includes a plurality of first touch electrodes and a plurality of first lead wires. The plurality of the first touch electrodes are located on the touch region. The plurality of the first touch electrodes are sequentially arranged along the first direction. One end of each of the plurality of the first lead wires is connected to one of the plurality of the first touch electrodes one by one, and another end of each of the plurality of the first lead wires is connected to the binding region. Further, at least one of the plurality of the first lead wires is located in the touch region.