Touch Display Panel Narrow Border-Bottom via Folded Trace Routing
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Solution Overview
Problem
Current touch display panels using COG technology have a wide border-bottom due to the substantial width of the bonding region, which affects the integration and cost-effectiveness of touch driving and LCD driving modules.
Innovation Solution
The touch display panel design includes a bonding region with a specific arrangement of first and second pads, and trace wires that reduce the height of the fan-out region, allowing for a narrower border-bottom by optimizing the layout of pads and wires, thereby facilitating further integration and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If COG technology is used to integrate touch driving module and LCD driving module, then space occupied by bonding is reduced and cost is reduced, but the border-bottom becomes substantially wide
Solution Approach 1:
The patent transitions from a conventional planar bonding layout to a folded trace wire configuration that utilizes the third dimension (vertical folding). The trace wires are folded back and forth between the pixel electrodes and the driving circuit, allowing signals to travel through additional spatial dimensions rather than only across the panel surface. This dimensional change enables compact routing that reduces the horizontal border-bottom width while maintaining adequate signal path length.
Solution Approach 2:
The trace wires are configured in a nested or folded pattern where the wire path is doubled back on itself multiple times within the bonding region. This nesting approach allows the trace wires to occupy a compact spatial footprint while providing sufficient signal transmission path length, effectively reducing the border-bottom width without compromising electrical connection quality.
2Length of stationary object
If the bonding region is made compact to narrow the border-bottom, then integration is improved and cost is reduced, but signal transmission efficiency and touch detection accuracy may be compromised
Solution Approach 1:
By routing trace wires through folded three-dimensional paths rather than straight horizontal lines, the patent maintains adequate signal transmission distance within a compact horizontal footprint. The vertical folding of trace wires provides sufficient electrical path length for reliable signal transmission while keeping the border-bottom width narrow.
Solution Approach 2:
The bonding region is segmented into multiple discrete pad groups (first pad groups and second pad groups) that are spatially separated and organized in distinct regions. This segmentation allows for optimized signal routing where trace wires can be dedicated to specific signal types (data signals vs. touch control signals) and routed through separate folded paths, reducing signal interference and maintaining transmission efficiency within the compact bonding region.
Data Source
AI summary
A touch display panel and a display device are provided. The touch display panel includes a display region and a non-display region. The display region includes a plurality of pixel electrodes and a plurality of touch control electrodes, and the non-display region includes a fan-out region and a bonding region used to bond a driving circuit. The bonding region includes a plurality of first pads and a plurality of second pads. A first pad is electrically connected to a signal output terminal of the driving circuit. A second pad is electrically connected to a signal input terminal of the driving circuit. The fan-out region includes a plurality of first trace wires electrically connected to the plurality of pixel electrodes as well as the plurality of first pads, and a plurality of second trace wires electrically connected to the touch control electrodes as well as the plurality of second pads.