Touch Panel Electrode Fillets Mitigate ESD Charge Accumulation
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Solution Overview
Problem
The manufacturing process of touch panels faces issues with electrostatic discharge (ESD) due to the accumulation of electric charges on sharp and tiny electrode patterns, leading to point discharge and potential short-circuiting of transparent electrodes, as the black matrix used in the process cannot withstand high temperatures and becomes carbonized, compromising its conductivity.
Innovation Solution
The touch panel design incorporates electrode patterns with specific shapes based on their location, featuring polygons with fillets on the mask area and taper angles on the display area, where the fillets have a larger radius of curvature to mitigate charge accumulation and ESD, while maintaining the visual effect of the transparent electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sharp and tiny electrode patterns are formed on the black matrix, then the transparency and visual effect of the transparent electrode layer is improved, but the accumulation of electric charges increases leading to point discharge and potential short-circuiting
Solution Approach 1:
The patent applies curvature by replacing sharp corners with rounded corners (arc shapes) in the electrode patterns formed on the black matrix. This curvature modification reduces the concentration of electric charges at corner points, preventing point discharge while maintaining the transparency and visual effect of the transparent electrode layer. The arc-shaped corners distribute electric field intensity more uniformly, eliminating the harmful sharp edges that cause charge accumulation.
2Ease of manufacture
If the black matrix is used in subsequent high temperature manufacturing processes, then the manufacturing process can proceed, but the black matrix becomes carbonized and develops slight conductivity causing ESD issues
Solution Approach 1:
The patent applies preliminary anti-action by designing the electrode patterns with rounded corners before the high temperature manufacturing process. This pre-designed geometric feature prevents the harmful effect of charge accumulation that would otherwise occur on sharp corners after the black matrix becomes carbonized. The rounded corner design anticipates and counteracts the future conductivity changes of the black matrix, ensuring reliable operation even after carbonization occurs during high temperature processing.
3Manufacturing precision
If electrode patterns with sharp corners are used, then the manufacturing precision and density of electrode patterns can be increased, but the electric field intensity at corners increases causing charge accumulation
Solution Approach 1:
The patent replaces sharp corners with arc-shaped rounded corners in the electrode patterns. This curvature modification maintains the high density and precision of the electrode pattern layout while eliminating the sharp edges that concentrate electric fields. The rounded corners distribute the electric field intensity more evenly, preventing charge accumulation at corner points while preserving the manufacturing precision and high density of the electrode pattern design.
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 effectively reduces the accumulation of electric charges and minimizes the risk of point discharge, ensuring the stability and functionality of the touch panel by distributing charges uniformly and preventing short-circuiting.
Implementation Method 1
the phenomenon of point discharge will occur to the electrode patterns. When the phenomenon of point discharge occurs, the black matrix 11 with slight conductivity will be hit by electrostatic discharge (ESD)
Data Source
AI summary
A touch panel, a touch display panel and a touch display device are provided. The touch panel includes a first substrate, a black matrix, and a transparent electrode layer. The first substrate has a display area and a mask area surrounding the display area. The black matrix is disposed on the mask area of the first substrate. The transparent electrode layer is disposed on the first substrate. The transparent electrode layer includes a first appearance electrode pattern disposed on the black matrix, and the first appearance electrode pattern includes two first edges and a first arc connected with the two first edges.