Electrostatic Discharging Pattern for Capacitive Touch Screen Panel
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Solution Overview
Problem
Electrostatic capacitive touch screen panels are vulnerable to damage from static electricity during manufacturing, module fabrication, product transportation, and use, as static electricity can induce high currents through small contact holes and connection patterns, leading to potential damage.
Innovation Solution
Incorporating static electricity discharging patterns connected to the electrode patterns via specific contact holes, with a thickness ratio of 1/12 to 1/4 of the discharging pattern, to guide and dissipate static electricity, preventing damage to contact holes and connection patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the contact holes and connection patterns are made small to improve touch accuracy, then the measurement precision is improved, but the panel becomes vulnerable to static electricity damage
Solution Approach 1:
A dedicated static electricity discharging pattern is introduced as an intermediary component between the electrode patterns and the external environment. This separate discharging path allows static electricity to be safely diverted without passing through the small contact holes and connection patterns, thus protecting them while maintaining small dimensions for high touch accuracy.
Solution Approach 2:
The electrical conduction path is segmented into two separate functions: one path through contact holes for normal electrode connection, and another dedicated path through the static electricity discharging pattern for static charge dissipation. This segmentation allows each path to be optimized independently - contact holes remain small for precision while the discharging pattern can be larger and more robust.
2Illumination intensity
If the thickness of connection patterns is reduced to improve transparency, then the visual quality is improved, but the resistance to static electricity damage decreases
Solution Approach 1:
Different parts of the electrode system have different thickness characteristics optimized for their specific functions. The connection patterns maintaining thin profiles for transparency, while the static electricity discharging pattern has greater thickness to provide robust static charge dissipation capability. This local differentiation allows each component to optimize its properties for its intended purpose.
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 solution effectively increases the voltage threshold for damage, from 2.9 kV for conventional panels to 4.8 kV, significantly reducing the risk of panel damage from static electricity.
Implementation Method 1
at least one static electricity discharging pattern formed in the electrode forming part, and connected with any one of the first electrode serials and the second electrode serials
Data Source
AI summary
A touch screen panel includes a substrate having an electrode forming part, a routing wire forming part and a pad forming part; a plurality of first electrode serials arranged in a first direction in the electrode forming part; a plurality of second electrode serials arranged in a second direction crossing over the first direction in the electrode forming part, and electrically insulated from the plurality of first electrode serials by an insulation; and at least one static electricity discharging pattern formed in the electrode forming part, and connected with any one of the first electrode serials and the second electrode serials.