Double-Layer Touch Line Layout for Low-Resistance Display Panels
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Solution Overview
Problem
Existing display technologies face challenges in reducing the resistance of peripheral touch detection leads while maintaining effective touch functionality, which can lead to increased energy consumption and compromised display quality.
Innovation Solution
A display panel design incorporating a double-layer structure for peripheral touch detection leads, comprising a first touch line and a second touch line with different resistances per unit length, connected through via holes to ensure consistent touch driving and sensing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer touch line structure is used, then the device complexity is reduced, but the touch signal consistency deteriorates due to resistance differences
Solution Approach 1:
The touch line structure is segmented into two separate layers (first touch line layer and second touch line layer), with each layer containing touch lines that connect to different regions of the touch electrode. This segmentation allows independent optimization of each layer's resistance characteristics, enabling consistent signal transmission to both ends of the touch electrode while maintaining manageable device complexity through modular architecture.
2Measurement precision
If touch lines with different resistances are used in different regions, then the touch accuracy is improved, but the signal interference increases
Solution Approach 1:
The patent implements equipotentiality by designing the first and second touch lines with matched resistance values, ensuring that both ends of the touch electrode receive signals at equivalent potential levels. This resistance matching eliminates potential differences that would cause signal interference, while still allowing different resistance characteristics in different regions to optimize touch accuracy through compensated signal paths.
3Use of energy by moving object
If the touch line resistance is reduced, then the energy consumption is reduced, but the touch line width must be increased which affects the display region
Solution Approach 1:
The patent transitions from a single-plane touch line design to a three-dimensional multi-layer structure. By distributing touch lines across two different layers (first touch line layer and second touch line layer), the design reduces the effective path length and resistance in each layer independently, lowering energy consumption without requiring wider touch lines that would encroach on the display region. The via holes provide vertical connectivity, enabling this dimensional optimization.
Data Source
AI summary
A display panel includes: a base substrate; a first touch layer including a first touch line; a touch insulation layer provided with a via hole at least partially located in the non-display region; and a second touch layer including a second touch line with different resistance per unit length from the first touch line and at least partially located in the non-display region. Orthographic projections of the second touch line and the first touch line on the base substrate at least partially overlap with each other, the second touch line is connected to the first touch line through the via hole; a part of the first touch line and/or the second touch line connected to the functional structure of the display panel forms a connection part, and the via hole is at least located on a side of the connection part away from the functional structure.