Touch Panel Shielding Layer Connection via Conductive Adhesive
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Solution Overview
Problem
Conventional touch panel technologies damage the shielding layer during the thermal bonding process used for electrical connection, which affects the reliability and integrity of the shielding layer.
Innovation Solution
A conductive connection design using an adhesive layer with a space filled with conductive glue between the shielding layer and the external circuit connection element, eliminating the need for thermal bonding and preventing damage to the shielding layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal bonding process is used to form electrical connection between FPC and shielding layer, then electrical connection is achieved, but the shielding layer is damaged
Solution Approach 1:
The patent introduces conductive adhesive as an intermediary substance between the FPC and shielding layer. This adhesive layer with conductive particles provides the electrical connection pathway without requiring thermal bonding, thus mediating the connection while protecting the shielding layer from thermal damage
Solution Approach 2:
The patent replaces the thermal bonding process (thermal system) with a mechanical adhesive bonding system. The conductive adhesive provides both mechanical attachment and electrical conduction through conductive particles, eliminating the need for high-temperature thermal processing that damages the shielding layer
2Ease of manufacture
If thermal bonding process is used to connect FPC to shielding layer, then electrical connection is formed, but the shielding layer integrity is compromised
Solution Approach 1:
The patent changes the bonding parameters from high-temperature thermal bonding to room-temperature or low-temperature adhesive bonding. The conductive adhesive contains conductive particles that provide electrical connection without requiring high temperature, thus maintaining shielding layer integrity while achieving ease of manufacture
Solution Approach 2:
The patent uses composite conductive adhesive material that combines adhesive properties for bonding with conductive particles for electrical connection. This composite material simultaneously provides mechanical attachment and electrical conductivity without thermal damage to the shielding layer
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 design enhances the reliability and integrity of the shielding layer by avoiding thermal bonding, ensuring a stable electrical connection without damaging the shielding layer, and improving the fabrication process of touch panels.
Implementation Method 1
The conductive glue is between the second connection portion and the shielding layer
Implementation Method 2
an adhesive layer to attach the shielding layer and the shielding-film substrate to the touch-sensing layer
Data Source
AI summary
A touch panel is provided. The touch panel includes a touch-sensing layer disposed on a substrate. A shielding layer is disposed on a shielding-film substrate. The shielding layer and the shielding-film substrate are disposed under the touch-sensing layer, wherein the shielding layer faces the touch-sensing layer. An adhesive layer is disposed between the touch-sensing layer and the shielding layer. An external circuit connection element has a first connection portion electrically connected with the touch-sensing layer and a second connection portion electrically connected with the shielding layer. The adhesive layer has a space and the second connection portion is disposed in the space. The space is filled with conductive glue. The conductive glue is between the second connection portion and the shielding layer. Moreover, a method for fabricating the touch panel is also provided.