Touch Display Panel Impedance Matching for Electrostatic Reliability
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Solution Overview
Problem
Touch display panels face challenges in ensuring electrical reliability and preventing electrostatic damage due to static electricity, particularly with the risk of electrostatic discharge causing breakdowns, especially when the touch electrodes have smaller areas and higher impedance differences.
Innovation Solution
The touch display panel design includes a first touch unit with a smaller area and impedance compared to second touch units, arranged in a matrix with intersecting directions, and features impedance matching and hole configurations to reduce electrostatic discharge risks, ensuring equal electrostatic discharge currents and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the area of touch electrodes is reduced to achieve smaller display panel size, then the size of the display panel is reduced, but the electrostatic reliability deteriorates due to higher impedance and increased susceptibility to electrostatic discharge
Solution Approach 1:
The patent applies local quality by differentiating the impedance characteristics of touch electrodes in different regions. Edge region touch electrodes are designed with impedance matching to adjacent electrodes, while central region electrodes have different impedance characteristics. This localized impedance optimization allows smaller electrode areas in edge regions without compromising overall electrostatic reliability, thereby reducing display panel size while maintaining reliability.
Solution Approach 2:
The patent changes the impedance parameter of touch electrodes based on their spatial location. By adjusting the impedance of edge region touch electrodes to match adjacent electrodes, and optimizing the area and impedance parameters of first touch units, the patent enables smaller electrode dimensions while maintaining consistent electrostatic discharge characteristics across the display panel, thus reducing size without sacrificing reliability.
2Measurement precision
If the area of first touch unit is reduced to improve display resolution, then the resolution is improved, but the impedance difference with second touch units increases causing electrostatic discharge risks
Solution Approach 1:
The patent applies local quality by implementing different design strategies for first touch units in edge regions versus second touch units in central regions. First touch units have their impedance specifically matched to adjacent touch electrodes, while second touch units maintain different impedance characteristics. This localized differentiation allows the first touch units to have smaller areas for higher resolution without creating harmful impedance mismatches that would cause electrostatic discharge.
Solution Approach 2:
The patent achieves equipotentiality by matching the impedance of first touch units to their adjacent touch electrodes. This impedance matching creates equipotential conditions during electrostatic discharge events, preventing potential differences that would drive harmful discharge currents. The equipotential design allows smaller first touch unit areas while eliminating electrostatic discharge risks associated with impedance mismatches.
3Object-affected harmful factors
If the impedance of touch electrodes is increased to reduce electrostatic discharge current, then the electrostatic discharge current is reduced, but the touch sensitivity deteriorates
Solution Approach 1:
The patent applies local quality by implementing different impedance optimization strategies for different regions. Edge region first touch units have impedance matched to adjacent electrodes to minimize electrostatic discharge currents, while central region second touch units have different impedance characteristics optimized for touch sensitivity. This localized approach allows reduced electrostatic discharge current in critical edge regions without compromising overall touch sensitivity across the display panel.
Data Source
AI summary
A touch display panel has a first region and a second region. The touch display panel includes a first touch unit located in the first region, and a plurality of second touch units located in the second region, wherein the plurality of second touch units is arranged in a matrix in a first direction and a second direction, the first direction intersecting the second direction. An area of an orthographic projection of the first touch unit on a plane of the touch display panel is smaller than an area of an orthographic projection of one second touch unit of the plurality of second touch units on the plane of the touch display panel. An absolute value of a difference between an impedance of the first touch unit and an impedance of the one second touch unit is smaller than a first preset threshold.