Touch Panel Electrode Line Routing for Narrow Frame Design
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Solution Overview
Problem
Capacitive touch devices with mutual-capacitance detection modes require a significant frame area for wiring, which hinders the realization of a narrow frame design due to the need for extensive touch sensing electrode lines, leading to reduced accuracy and increased parasitic capacitance.
Innovation Solution
The touch panel design incorporates opening areas in the touch electrodes and partially arranges the touch electrode lines within the touch area, reducing the frame area on both sides and minimizing parasitic capacitance by overlapping the touch electrode lines with the substrate, thereby enhancing accuracy and enabling a narrower frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch sensing electrode lines are arranged in the frame area, then wiring can be completed, but the frame area must be widened which prevents narrow frame design
Solution Approach 1:
The patent changes the arrangement dimension of touch sensing electrode lines from the frame area (peripheral dimension) to the touch area (active display dimension). By allowing electrode lines to extend through the touch area and overlap with opening areas in the touch electrodes, the wiring function is achieved without requiring additional frame width.
2Area of stationary object
If touch electrode lines are extended into the touch area, then frame width can be reduced, but parasitic capacitance increases which reduces touch detection accuracy
Solution Approach 1:
The patent applies local quality by creating opening areas (transparent regions) at specific locations within the touch electrodes where electrode lines pass through. This localized modification reduces parasitic capacitance only in the critical overlapping regions while maintaining the overall continuity and functionality of the touch electrodes elsewhere.
Solution Approach 2:
The patent extracts or removes conductive material to create opening areas in the touch electrodes. By taking out portions of the touch electrode material where electrode lines overlap, the parasitic capacitance between the electrode lines and touch electrodes is reduced, thereby improving touch detection accuracy.
3Measurement precision
If opening areas are created in touch electrodes, then parasitic capacitance is reduced improving accuracy, but manufacturing complexity increases
Solution Approach 1:
The patent merges the opening area formation process with the existing touch electrode fabrication process. The opening areas are created as integral part of the touch electrode pattern definition, combining multiple functions (electrode formation and parasitic capacitance reduction) into a single structural design without requiring separate manufacturing steps.
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
This design reduces the frame area on the touch panel, improving touch detection accuracy by minimizing parasitic capacitance and allowing for a more compact device structure while maintaining effective touch sensing capabilities.
Implementation Method 1
when a finger contacts a screen of the touch device, the finger and certain touch electrodes on the screen form a coupling capacitor, and a leakage current flows out of the coupling capacitor
Implementation Method 2
the orthographic projection of the first touch electrode line to the substrate overlaps with that of the opening area to the substrate, so that the parasitic capacitance between the first touch electrode line and the first touch electrode and/or the second touch electrode is reduced
Data Source
AI summary
The present application discloses a touch panel and a display device. The touch panel includes first touch electrodes arranged in a first direction and second touch electrodes arranged in a second direction in a touch area of a substrate, first touch electrode lines and second touch electrode lines, and the first touch electrode lines are at least partially arranged in a touch area, the first touch electrode and/or the second touch electrode has an opening area, and an orthographic projection of the first touch electrode line to the substrate overlaps with that of the opening area to the substrate.