Trench Line Bridge Structure for Static Discharge in Touch Sensors
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Solution Overview
Problem
Existing electronic apparatuses face challenges in maintaining uniform sensitivity and preventing electrical short-circuits across their sensing areas, particularly around trench parts, which can be prone to damage from static electricity.
Innovation Solution
The electronic apparatus incorporates a trench line with high conductivity and a connection line with lower conductivity, featuring a bridge part on a different layer, which is designed to maintain independent electrical signals and disperse static electricity effectively, ensuring uniform sensitivity and preventing short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trench line with high conductivity is used to connect sensing electrodes, then electrical connection reliability is improved, but the risk of static electricity damage and short-circuits increases
Solution Approach 1:
The patent applies local quality by using different conductivity materials in different regions of the connection line. The trench line portion uses high conductivity material for reliable electrical connection, while the bridge line portion uses low conductivity material to dissipate static electricity. This spatial differentiation of material properties resolves the contradiction between connection reliability and static electricity protection.
Solution Approach 2:
The connection line is constructed as a composite structure with two distinct portions: a trench line made of high conductivity material (such as aluminum or copper) and a bridge line made of low conductivity material (such as transparent conductive oxide). This composite material approach allows the single connection line to simultaneously achieve both high electrical connectivity and static electricity dissipation.
2Area of stationary object
If sensing lines are arranged closely to maintain compact design, then device area is reduced, but the risk of electrical short-circuits between lines increases
Solution Approach 1:
The patent resolves the spacing conflict by transitioning to a three-dimensional arrangement. Different sensing lines are placed on different layers (first sensing lines on one layer, second sensing lines on another layer), allowing them to cross without physical contact. This dimensional separation maintains compact area while preventing short-circuits.
Solution Approach 2:
The patent introduces an intermediary insulating structure (isolating structure) between the first and second sensing lines at their crossing point. This intermediary element prevents direct electrical contact between the closely spaced lines while allowing them to maintain their compact routing, thus preventing short-circuits without increasing area.
Data Source
AI summary
An electronic apparatus includes a plurality of first sensing electrodes, a plurality of second sensing electrodes, a plurality of first sensing lines, a plurality of second sensing lines, and a connection line connecting two second sensing patterns, which are spaced apart from each other, of one second sensing electrode of the second sensing electrodes. Each of the first sensing lines includes a trench line connected to one first sensing electrode of the first sensing electrodes and crossing the connection line so as to be insulated from the connection line. The connection line includes a plurality of line parts spaced apart from each other with the trench line therebetween on a plane and a bridge part on a layer different from that on which the line parts are on, the bridge part connecting the line parts to each other and having conductivity less than that of the trench line.