Touch Panel Electrode Loop Structure for Uniform Electric Field
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Solution Overview
Problem
Five-wire resistive touch panels face challenges in achieving uniform electric field distribution due to inconsistent resistance values in silver wires, leading to incorrect touch point detection and potential panel failure, which existing solutions like annular electrode loops partially address but not comprehensively.
Innovation Solution
The electrode loop structure features a cascaded arrangement of discontinuous resistor, conducting, and gradient chains on an electroconductive substrate, allowing for voltage regulation and compensation, ensuring a homogenized electric field and narrow-edge design for improved touch panel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discontinuous electrodes are arranged on the periphery to form annular electrode loops, then the potential ripple effect is improved, but the electrode distribution effectiveness and voltage regulation capability are insufficient
Solution Approach 1:
The annular electrode loop is segmented into multiple functional chains: discontinuous resistor chains for potential ripple suppression, gradient chains for voltage distribution, and conducting chains for voltage regulation. Each chain consists of discrete electrode elements arranged in specific patterns, allowing independent optimization of each function while maintaining overall system reliability.
Solution Approach 2:
Different regions of the electrode loop are assigned different functional properties: the discontinuous resistor chains provide high resistance for ripple suppression, the gradient chains provide progressive resistance values for uniform voltage distribution, and the conducting chains provide low resistance for voltage regulation. This local differentiation resolves the contradiction by allowing each region to specialize in its primary function.
2Area of stationary object
If the electrode loop is distributed on the periphery of the substrate, then the visible range is increased, but the edge trace layout space becomes constrained
Solution Approach 1:
The electrode loop structure utilizes the peripheral region of the substrate by arranging electrode elements in concentric circular patterns rather than linear traces. This dimensional transformation from 1D linear traces to 2D circular patterns allows the electrode loop to be distributed around the entire periphery, maximizing visible range while efficiently utilizing the limited edge space through radial arrangement.
Solution Approach 2:
The electrode elements are arranged in curved circular patterns following the periphery of the substrate, replacing traditional straight linear trace layouts. This curvature allows the electrode loop to wrap around the substrate edge, increasing the effective visible range while maintaining compact edge trace layout that fits within the constrained peripheral space.
3Reliability
If the resistance values of the circumferential silver wires are made consistent, then the electric field uniformity is improved, but the manufacturing precision requirement becomes extremely high
Solution Approach 1:
Instead of requiring all circumferential silver wires to have identical resistance values, the patent introduces gradient chains with progressively varying resistance values. The resistance parameters are deliberately changed across different segments to compensate for non-uniform voltage distribution, achieving electric field uniformity through parameter optimization rather than through stringent manufacturing precision control.
Solution Approach 2:
The gradient chain configuration provides a feedback mechanism where the progressive resistance values compensate for voltage drops along the periphery. By designing the resistance values to increase or decrease in a specific gradient pattern, the system automatically adjusts the voltage distribution to achieve uniformity, reducing the need for extremely high manufacturing precision in individual wire resistance values.
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 enhances the reproducibility and stability of the touch panel by providing a uniform electric field and increasing the visible range, thereby improving the reliability of the touch panel's edge design.
Implementation Method 1
the electrode loop has a discontinuous resistor chain, a conducting chain formed outside the discontinuous resistor chain and a gradient chain formed inside the discontinuous resistor chain
Data Source
AI summary
An electrode loop structure of a touch panel mainly extends from I-shaped electrode elements serving as a base, and utilizes the annular conducting chain and gradient chain regularly cascaded together. A discontinuous resistor chain is disposed between the conducting chain and the gradient chain, wherein the conducting chain changes, by adjusting the cascaded length of and the gaps between the electrode elements, the conductor area to generate the trend of voltage drop, so that the conducting chain has the voltage regulating and compensating properties. Meanwhile, the gradient chain may also make the gradient chain have the voltage distributing uniformity by adjusting the lengths of and the gaps between the electrode elements, so that the electrode loop is effectively distributed around the electroconductive substrate to form the homogenized electric field effect, thereby satisfying the narrow-edge design requirement.