Surface Capacitive Touch Panel Multi-Layer Electrode Field Linearity
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Solution Overview
Problem
Existing surface capacitive touch panels have limited detection accuracy due to a non-uniform and nonlinear electrical field, which restricts their application, especially in wide touch panels.
Innovation Solution
The introduction of a multi-layer electrode structure with axially-symmetric, parallel strip electrodes and specific connections forms a uniform electrical field, enhancing the linear degree of the electrical field applied to the resistive film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional electrode pattern is used in surface capacitive touch panels, then the structure is simple and manufacturing is easy, but the linear degree of the electrical field is insufficient, resulting in poor positioning accuracy
Solution Approach 1:
The electrode structure is divided into multiple segments including first strip electrodes, second strip electrodes, third strip electrodes, fourth strip electrodes, and fifth strip electrodes. Each segment serves a specific function in shaping the electrical field, allowing precise control over field distribution while maintaining manageable complexity through modular design
Solution Approach 2:
Different regions of the electrode structure have different configurations optimized for their local function. The first strip electrodes are positioned at specific locations to create linear electrical fields in particular areas, while other electrodes compensate for field distortions in different regions, achieving overall field uniformity through localized optimization
2Measurement precision
If more electrodes are added to improve electrical field linearity, then positioning accuracy improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple electrodes are merged into a coordinated system where first strip electrodes, second strip electrodes, third strip electrodes, fourth strip electrodes, and fifth strip electrodes work together as an integrated electrode assembly. This unified approach achieves superior field linearity through collaborative action rather than isolated electrode functions, simplifying the manufacturing process compared to adding numerous independent electrodes
Solution Approach 2:
The electrode structure extends into multiple layers with first strip electrodes in one layer and second strip electrodes in another layer. This three-dimensional arrangement allows electrical field control in multiple spatial dimensions, achieving comprehensive field uniformity without requiring excessive electrodes in a single plane
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 configuration improves the positioning accuracy by reducing nonlinear distortions in the electrical field, allowing for more precise touch detection and expanding the applicability of surface capacitive touch panels.
Implementation Method 1
the detection accuracy depends on the linearity of the electrical field applied to the resistive film
Data Source
AI summary
The invention provides a surface capacitive touch panel and an electronic device, said surface capacitive touch panel comprising: a resistive film, on which an electrode setting area divided into at least two layers is set; and a plurality of conductive electrodes, set in said electrode setting area; said plurality of conductive electrodes including at least one set of electrodes; wherein, said set of electrodes includes: a first strip electrode; a second strip electrode, in parallel with said first strip electrode, but in a different layer; a third strip electrode, in parallel with said first strip electrode, but in a different layer; said second strip electrode and said third strip electrode being located on the same side of said first strip electrode; a fourth strip electrode, both ends of which are connected with said first strip electrode and said second strip electrode, respectively; and a fifth strip electrode, both ends of which are connected with said first strip electrode and said third strip electrode, respectively. The invention enhances the linear degree of the electrical field applied to the resistive film, thereby enhancing the positioning accuracy.