Metal-Mesh Touch Electrode Layout With Dummy Electrode Coupling
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Solution Overview
Problem
Existing touch structures using metal meshes for touch electrodes face challenges in detection sensitivity due to low resistance and subtle capacitance changes, leading to reduced detection accuracy and effectiveness.
Innovation Solution
Incorporating a dummy electrode at or near the intersection of touch driving and sensing electrodes, which reduces the reference capacitance by blocking or redirecting electric field lines, thereby enhancing detection sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal mesh touch electrode structure is used, then the touch panel achieves basic touch functionality, but the detection sensitivity is low due to subtle capacitance changes
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between the touch driving electrode and the touch sensing electrode. This dummy electrode acts as a mediator that blocks parasitic capacitance paths and redirects electric field lines, thereby enhancing the signal strength and improving detection sensitivity without interfering with the primary touch sensing function
Solution Approach 2:
The patent converts the harmful parasitic capacitance effects into a beneficial reference capacitance. By strategically positioning the dummy electrode, the previously detrimental capacitance changes are transformed into a stable reference signal that improves the accuracy of touch detection by providing a baseline for comparison
2Measurement precision
If the reference capacitance is reduced to improve detection sensitivity, then false signals decrease, but the structure becomes more complex
Solution Approach 1:
The dummy electrode serves multiple functions simultaneously: it blocks parasitic capacitance paths, redirects electric field lines, provides a reference capacitance baseline, and reduces false signals. This multi-functionality allows the patent to improve detection accuracy without proportionally increasing structural complexity
Solution Approach 2:
The dummy electrode is positioned locally at specific critical points where parasitic capacitance effects are most prominent. By concentrating the modification at these local positions rather than redesigning the entire electrode structure, the patent achieves improved detection accuracy with minimal increase in overall structural complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dummy electrode improves detection sensitivity and accuracy by increasing the proportion of capacitance change caused by finger touch, reducing false signals and touch blind spots.
Implementation Method 1
reduces the reference capacitance by blocking or redirecting electric field lines
Implementation Method 2
increasing the proportion of capacitance change caused by finger touch
Data Source
AI summary
A touch structure, a touch display panel and an electronic apparatus are provided. The touch structure includes a first touch electrode extended along a first direction and a second touch electrode extended along a second direction; the first touch electrode includes first electrode main body portions in a first conductive layer and a first connection portion in a second conductive layer; the second touch electrode includes second electrode main body portions and a second connection portion in the first conductive layer; the first connection portion is overlapped with the second connection portion in a direction perpendicular to the first conductive layer; the first conductive layer includes first metal meshes formed by first metal lines. The touch structure also includes a dummy electrode in the second conductive layer. The dummy electrode is coupled with at least one of the first connection portion and the second connection portion.