Touch Screen Gold Finger with Grid Grooves
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Solution Overview
Problem
The existing gold fingers in touch screens, made through silver paste coating, tend to fall off or get scratched, leading to deteriorated conductivity and performance.
Innovation Solution
A gold finger design featuring an embossable adhesive layer with grid-shaped grooves and conductive grids embedded in these grooves, electrically connected to a circuit board via anisotropic conductive adhesive, ensuring a secure and stable connection that prevents falling off or scratching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silver paste is used to form the gold finger through silk screen printing or laser division, then the manufacturing process is simple and cost-effective, but the gold finger tends to fall off or be scratched, deteriorating conductivity and performance
Solution Approach 1:
The adhesive layer is divided into grid-shaped grooves that segment the conductive material into multiple small regions. This segmentation increases the contact area between the conductive material and adhesive layer, preventing the gold finger from falling off or being scratched while maintaining manufacturing simplicity
Solution Approach 2:
The adhesive layer has different local structures: the grid-shaped grooves provide enhanced adhesion in specific areas where conductive material is placed, while other areas maintain standard adhesive properties. This local quality variation ensures reliable bonding without complicating the overall manufacturing process
2Ease of manufacture
If the gold finger is made through silver paste coating, then the manufacturing cost is low, but the conductivity deteriorates due to scratching and falling off
Solution Approach 1:
The grid-shaped grooves segment the conductive material into multiple bonded regions, ensuring that even if one region is damaged, other regions maintain electrical connection. This segmentation preserves conductivity while keeping the silver paste coating method cost-effective
Solution Approach 2:
The invention transitions from a flat, two-dimensional silver paste coating to a three-dimensional structure with grid-shaped grooves. This dimensional change increases the contact area and bonding strength, improving reliability and conductivity without significantly increasing manufacturing cost
Data Source
AI summary
A gold finger, includes a substrate, an embossable adhesive layer and a plurality of wires. The gold finger is achieved through adhering an embossable adhesive layer to a side of the substrate, providing grid-shaped grooves on a side of the embossable adhesive layer away from the substrate, embedding conductive grids of the wires in the grooves to form the wires. The gold finger is disposed on a sensing component, the wires of the gold finger are electrically connected with a circuit board through an anisotropic conductive adhesive. The contact area of the wire and the embossable adhesive layer is increased through embedding the conductive grid of the wire, which is grid-shaped structure, in the grooves such that the wires are tightly combined to the embossable adhesive layer and not easy to fall off or be scratched. The present invention further provides a touch screen containing the gold finger.