Touch Panel ESD Protection via Insulating Overcoat Layer
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Solution Overview
Problem
The existing capacitive touch screen technology faces issues with electro-static discharge (ESD) in the peripheral area of the cover glass due to the overlap of conductive light blocking layers, leading to performance degradation and reduced product yield.
Innovation Solution
A touch panel design that includes a non-conductive first over coating layer positioned between the light blocking layer and the touch structure in the peripheral area, effectively isolating the light blocking layer and enhancing ESD resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the touch structure is disposed in the peripheral area adjacent to the central area to increase touch effect, then the touch sensitivity at the edge is improved, but the light blocking layer with conductive elements causes electro-static discharge (ESD) leading to performance degradation
Solution Approach 1:
An insulating layer is introduced as an intermediary between the conductive light blocking layer and the touch structure in the peripheral area. This insulating layer prevents direct electrical contact, thereby blocking the ESD path while allowing the touch structure to maintain its sensitivity function. The mediator resolves the contradiction by enabling both touch sensitivity and ESD resistance simultaneously.
Solution Approach 2:
The peripheral area is segmented into distinct functional zones: the light blocking layer for light blocking and decoration, the insulating layer for ESD protection, and the touch structure for touch sensing. This segmentation allows each layer to perform its specific function without interfering with others, particularly preventing the harmful ESD interaction between conductive elements.
2Illumination intensity
If the light blocking layer with conductive elements is disposed in the peripheral area for light blocking and decoration, then the light blocking function is improved, but ESD occurs causing performance degradation or destruction
Solution Approach 1:
The insulating layer serves as a mediator between the conductive light blocking layer and other conductive structures. It maintains the light blocking function by allowing the conductive light blocking layer to remain in place while preventing ESD by blocking electrical current paths through its insulating properties.
3Reliability
If the first over coating layer covers the light blocking layer and is positioned between it and the touch structure, then ESD resistance is enhanced, but the device structure becomes more complex
Solution Approach 1:
The first over coating layer is designed to serve multiple functions simultaneously: it provides ESD protection by insulating the conductive light blocking layer, maintains structural integrity of the touch panel, and can be integrated with existing manufacturing processes. This multi-functionality justifies the additional layer by delivering multiple benefits from a single structural addition.
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
The implementation of the non-conductive over coating layer significantly enhances ESD resistance in the peripheral area, thereby improving the product yield and maintaining the performance of the cover glass.
Implementation Method 1
electro-static discharge (ESD) easily occurs in the peripheral area 02 of the cover glass, causing the performance of the cover glass to be degraded or even destroyed
Data Source
AI summary
A touch panel, including a base substrate and a touch structure disposed on the base substrate, the touch structure disposed in a central area of the base substrate and in a portion of a peripheral area adjacent to the central area; the touch panel further including a light blocking layer disposed in the peripheral area and a first over coating layer at least covering the light blocking layer; wherein the first over coating layer is disposed between the light blocking layer and the touch structure. A display device is further disclosed.