Touch-Sensing Electrode Connecting Portion Width for Static Electricity Resistance
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Solution Overview
Problem
Capacitive touch panels are vulnerable to static electricity due to the high impedance of the connecting portions of the sensing electrodes, which leads to heat generation and potential burning, causing circuit shorts and panel failure.
Innovation Solution
The touch-sensing electrode structure is designed with a connecting portion width equal to or greater than half the width of the main body, and signal-transmitting wires are positioned to cover the connecting portion, reducing the static electricity per unit area and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width of the connecting portion is smaller than half the width of the end of the main body, then the signal-transmitting wires and connecting portions have similar sizes enabling proper electrical connection, but the limited cross-sectional area causes high static electricity density and heat generation leading to burning damage
Solution Approach 1:
The patent changes the width parameter of the connecting portion from being smaller than half the main body width to being equal to or larger than half the main body width. This parameter change increases the cross-sectional area to reduce static electricity density and heat generation, while still maintaining proper connection with signal-transmitting wires of similar size
Solution Approach 2:
The patent designs the connecting portion with sufficient width in advance to cushion against the harmful effects of static electricity. By pre-establishing a larger cross-sectional area, the structure can withstand static electricity discharge without burning, preventing circuit shorts and panel failure before they occur
2Reliability
If the connecting portion has high impedance (several thousand Ohms), then the electrical connection is functional, but static electricity passing through generates excessive heat causing burning and circuit shorting
Solution Approach 1:
The patent changes the geometric parameters of the connecting portion (increasing width to equal or greater than half the main body width) to alter its electrical properties. This increases the cross-sectional area, which reduces both impedance and static electricity density, thereby reducing heat generation while maintaining electrical connection functionality
Solution Approach 2:
The patent converts the potentially harmful high impedance characteristic into a beneficial design feature by intentionally designing the connecting portion with specific dimensions. The increased width reduces static electricity density and heat generation, transforming the impedance characteristic from a liability into a controlled parameter that ensures both functionality and safety
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 enhances the static-electricity endurance of the touch-sensing electrode structure by reducing heat generation and preventing burning damage, thereby improving the reliability of capacitive touch panels.
Implementation Method 1
According to Joule's Law: Q=I2Rt, static electricity passing through signal-transmitting wires or sensing electrodes produces heat. Given that impedance of metal signal-transmitting wires is smaller (approximately several hundred Ohms), the heat generated by static electricity passing through the metal signal-transmitting wires is not sufficient to burn the wires. However, the higher impedance of the connecting portions of the sensing electrodes (approximately several thousand Ohms) results in generating more heat.
Data Source
AI summary
The present disclosure provides a touch-sensing electrode structure, which includes a plurality of touch-sensing electrodes. Each of the touch-sensing electrodes includes a main body and a connecting portion connected to an end of the main body; wherein the width of the connecting portion is not less than a half width of the end of the main body. The touch-sensing electrode structure also includes a plurality of signal-transmitting wires, each of which includes a head portion and a tail wire connected to the head portion. The head portions of the signal-transmitting wires is superimposed on the connecting portions and electrically connected to the connecting portions respectively. Furthermore, a method of manufacturing the above touch-sensing electrode structure is also provided.