Touch Panel Mesh Electrode Leg Width Optimization
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Solution Overview
Problem
Capacitive touch sensors in display devices face reduced touch sensitivity due to increased parasitic capacitance caused by overlapping connection parts between touch electrodes, which affects the accuracy and reliability of touch information detection.
Innovation Solution
A touch panel design featuring a mesh pattern of first and second touch electrodes with narrower leg parts connecting adjacent electrodes, minimizing the overlapping area and thus reducing parasitic capacitance, while maintaining electrical connectivity through contact parts and an insulating layer for separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection parts connecting adjacent touch electrodes are made with larger overlapping area, then electrical connectivity is improved, but parasitic capacitance increases resulting in reduced touch sensitivity
Solution Approach 1:
The connection part is divided into distinct regions with different properties: contact parts with larger area for electrical connectivity, and a leg part with narrower width for minimizing parasitic capacitance. This local differentiation allows each region to optimize for its specific function.
Solution Approach 2:
The connection part is segmented into multiple functional sections (contact parts and leg part) rather than being a uniform structure. This segmentation enables the contact parts to provide robust electrical connection while the leg part minimizes parasitic capacitance effects.
2Measurement precision
If mesh pattern density is increased to improve touch electrode coverage, then touch sensing capability is improved, but parasitic capacitance from overlapping connection parts increases
Solution Approach 1:
The mesh pattern is designed with varying local characteristics: touch electrodes maintain adequate density for sensing, while connection parts use narrower leg portions to reduce parasitic capacitance in high-density regions.
Solution Approach 2:
The insulating layer acts as an intermediary between overlapping connection parts, providing electrical isolation that reduces parasitic capacitance while allowing the mesh pattern to maintain its structural integrity and sensing function.
3Measurement precision
If connection parts are made narrower to reduce parasitic capacitance, then touch sensitivity is improved, but electrical connectivity may be compromised
Solution Approach 1:
The connection part is segmented into contact parts with larger area for reliable electrical connectivity and a leg part with narrower width for reduced parasitic capacitance. This segmentation resolves the contradiction by assigning different dimensional characteristics to different functional regions.
Solution Approach 2:
Different regions of the connection part have different local properties: contact parts have larger cross-sectional area optimized for electrical connection, while the leg part has narrower width optimized for minimizing parasitic capacitance.
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 design enhances signal sensitivity and touch accuracy by minimizing parasitic capacitance, improving the driving margin and enabling a higher report rate with reduced luminance deterioration at intersecting points.
Implementation Method 1
In the capacitive touch sensor, the touch electrodes form a capacitor and may sense a change in a capacitance of a capacitor generated by a touch.
Implementation Method 2
the more the overlapping area increases, the more parasitic capacitance increases, resulting in reduced touch sensitivity
Data Source
AI summary
A touch panel includes: a substrate; a plurality of first touch electrodes and a plurality of second touch electrodes disposed on the substrate and formed in a mesh pattern; a plurality of first connection parts connecting adjacent first touch electrodes and formed in the mesh pattern; and a plurality of second connection parts connecting adjacent second touch electrodes. The second connection part may include first and second contact parts overlapping the adjacent second touch electrodes, respectively, and a leg part connecting the first and second contact parts and a width of the leg part may be narrower than that of an opening of the mesh pattern.