Touch Substrate Signal Transmission Line Winding for Resistance Matching
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Solution Overview
Problem
Capacitance type touch panels face reduced sensing accuracy due to mismatched resistance or capacitance in signal transmission lines, which fail to meet the requirements of different sensing chip designs.
Innovation Solution
The touch substrate and display panel feature signal transmission lines with winding portions and conductive patterns to adjust resistance and capacitance, ensuring equal resistance and capacitance between lines, accommodating various sensing chip principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal transmission lines are designed with uniform length and layout, then manufacturing is simplified, but resistance and capacitance values become inconsistent across different lines
Solution Approach 1:
The patent applies local quality by introducing winding portions at specific locations (near signal pads) of otherwise uniform signal transmission lines. This allows different sections of the same line type to have different electrical characteristics (resistance and capacitance) tailored to meet the requirements of different sensing chip designs, while maintaining overall manufacturing simplicity through a modular approach.
2Measurement precision
If signal transmission lines are modified to achieve equal resistance and capacitance, then sensing accuracy improves, but device complexity increases
Solution Approach 1:
The patent segments the signal transmission lines into two distinct parts: a main uniform transmission line portion and a winding portion. This segmentation allows the complex electrical characteristic adjustments to be confined to specific winding sections rather than requiring modification of the entire transmission line network, thereby reducing overall device complexity while achieving equal resistance and capacitance values.
Solution Approach 2:
The patent uses winding portions with curved or spiral geometries to increase the effective length and adjust electrical characteristics. By introducing controlled curvature in specific sections of the signal transmission lines, the design achieves equal resistance and capacitance values without requiring complete redesign of the entire transmission line layout.
3Measurement precision
If the touch substrate is designed to work with specific sensing chips, then sensing accuracy is optimized, but adaptability to different sensing chip designs is reduced
Solution Approach 1:
The patent achieves universality by designing signal transmission lines with adjustable winding portions that can be configured to provide equal resistance and capacitance values. This modular design allows the same touch substrate structure to be adapted to work with different sensing chip designs (whether based on resistance equality or capacitance equality principles) without requiring complete redesign, thus maintaining both sensing accuracy and broad compatibility.
Data Source
AI summary
A touch substrate including a substrate, a plurality of first sensing series, a plurality of second sensing series, a plurality of signal pads, a plurality of signal transmission lines, and a plurality of conductive patterns is provided. The substrate has an active region and a peripheral region located outside the active region. The first and the second sensing series are disposed on the substrate and located in the active region. The signal pads are disposed on the substrate and located at the peripheral region. The signal transmission lines are disposed on the substrate and located in the peripheral region, and connect the first sensing series and the second sensing series to the corresponding signal pads. Each signal transmission line includes a winding portion disposed adjacent to one corresponding signal pad. Each conductive pattern is disposed on one signal pad and extends above the winding portion of one signal transmission line.