Touch Panel Internal Connecting Terminal Parallel Structure
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Solution Overview
Problem
Projected capacitive touch panels face issues with high electrical resistance in internal connecting terminals due to their proximity and low conductivity, leading to poor conduction and increased manufacturing costs.
Innovation Solution
Implementing a parallel connection structure for internal connecting terminals using two layers of conductive patterns under an interlayer insulating film, reducing electrical resistance without additional manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If internal connecting terminals are made of transparent conductive oxide to maintain transparency, then optical characteristics are preserved, but electrical resistance increases and conduction deteriorates
Solution Approach 1:
The internal connecting terminals are constructed as a composite structure combining transparent conductive oxide (maintaining transparency) with metal material (enhancing conductivity). This composite approach allows the terminal to simultaneously achieve optical transparency and electrical reliability, resolving the contradiction between these two properties.
2Measurement precision
If adjacent internal connecting terminals are placed close together to achieve precise touch detection, then measurement precision improves, but terminal width decreases and electrical resistance increases
Solution Approach 1:
By using composite materials (transparent conductive oxide + metal) for the internal connecting terminals, the invention enables terminals to maintain sufficient electrical conductivity even when placed close together with reduced width. The metal component compensates for the increased resistance caused by smaller dimensions, allowing high-precision touch detection without sacrificing conduction reliability.
3Reliability
If a parallel connection structure with two layers is implemented to reduce electrical resistance, then conduction improves, but device complexity increases
Solution Approach 1:
The parallel connection structure merges the transparent conductive oxide layer and metal layer into a unified internal connecting terminal. Rather than treating them as separate components requiring additional assembly steps, the invention integrates them into a single functional element that can be formed in one manufacturing process, thereby improving conduction without proportionally increasing device complexity.
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 solution effectively decreases the electrical resistance of internal connecting terminals, enhancing touch position detection accuracy and reducing manufacturing costs while maintaining transparency and conductivity.
Implementation Method 1
an internal connecting terminal connected to at least one of the first conductive pattern or the second conductive pattern, and connected to a lead base end of the lead line
Implementation Method 2
an interlayer insulating film provided to cover at least part of the first conductive pattern
Data Source
AI summary
An internal connecting terminal (33) includes a first interconnect layer (34A) formed of a same film as a first conductive pattern for touch position detection under an interlayer insulating film (23), and a second interconnect layer (34B) formed of a same film as a second conductive pattern for touch position detection on the interlayer insulating film (23). The first and the second interconnect layers are electrically connected to a lead line (31) at a portion overlapping the lead line (31), and electrically connected together at a portion outside the lead line (31).