Capacitive Touch Screen Panel Connection Patterns for Static Protection
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Solution Overview
Problem
Capacitive touch screen panels are vulnerable to damage from static electricity due to high contact resistance and weak static electricity resistance, particularly in the contact holes and connection patterns, which can be damaged by high currents during manufacturing or transportation.
Innovation Solution
The design includes a substrate with first and second electrode serials crossed by insulation patterns, and first connection patterns with overlapping sections of varying widths to reduce contact resistance and prevent damage from static electricity, while also narrowing the overlap area of the second connection patterns to decrease parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact holes are made very small to improve touch perception precision, then measurement precision is improved, but contact resistance increases and static electricity resistance decreases
Solution Approach 1:
The patent applies different material properties to different parts of the connection structure. The first connection pattern uses a metal material (high conductivity) specifically in the contact hole region, while other areas can use transparent conductive materials. This local differentiation allows small contact holes to maintain both precision and electrical reliability.
Solution Approach 2:
The patent employs composite material structures where metal materials are combined with transparent conductive materials in the connection patterns. The metal layer provides low contact resistance and high static electricity resistance, while the transparent conductive material maintains optical properties. This composite approach resolves the contradiction between small hole precision and electrical reliability.
2Ease of operation
If first connection patterns and first electrode patterns are formed in different materials to optimize performance, then ease of operation is improved, but contact resistance increases
Solution Approach 1:
The patent applies different material properties to different parts of the connection structure. The first connection pattern uses a metal material (high conductivity) specifically in the contact hole region, while other areas can use transparent conductive materials. This local differentiation allows small contact holes to maintain both precision and electrical reliability.
Solution Approach 2:
The patent employs composite material structures where metal materials are combined with transparent conductive materials in the connection patterns. The metal layer provides low contact resistance and high static electricity resistance, while the transparent conductive material maintains optical properties. This composite approach resolves the contradiction between small hole precision and electrical reliability.
3Reliability
If overlap area of connection patterns is increased to reduce contact resistance, then electrical conductivity is improved, but parasitic capacitance increases
Solution Approach 1:
The patent makes the width of the first connection pattern position-dependent: wider in regions overlapping with electrode patterns (to reduce contact resistance) and narrower in non-overlapping regions (to minimize parasitic capacitance). This spatially varying width optimizes both electrical conductivity and capacitance characteristics.
Solution Approach 2:
The patent introduces dimensional variation in the connection pattern width along its length, transitioning from a uniform width to a variable width profile. This dimensional change allows the pattern to achieve low contact resistance at critical interfaces while maintaining low parasitic capacitance in non-critical areas.
Data Source
AI summary
A touch screen panel according to an embodiment includes a substrate; a plurality of first electrode serials arranged in a first direction on the substrate, each of the first electrode serials including a plurality of first electrode patterns; a plurality of second electrode serials arranged in a second direction on the substrate and crossing over the plurality of first electrode serials; a plurality of insulation patterns formed between the first electrode serials and the second electrode serials at regions in which the first electrode serials crosses over the second electrode serials so that the first electrode serials are insulated from the second electrode serials; and a plurality of first connection patterns formed on the substrate to connect neighboring first electrode patterns to each other.