Friction Welding Flexible Circuit to Touch Sensor
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Solution Overview
Problem
Existing touch sensor technologies face challenges in manufacturing efficiency, cost, and reliability, particularly in the assembly and integration of touch sensors with processing components, which can lead to increased complexity and susceptibility to moisture ingress.
Innovation Solution
The implementation of a touch sensing system that uses a capacitive touch sensor with electrodes made of indium tin oxide (ITO) or fine lines of metal, coupled with a flexible printed circuit and optically clear adhesives, and employs friction welding for mechanical bonding, simplifying the manufacturing process and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional assembly methods are used to integrate touch sensors with processing components, then manufacturing complexity increases, but structural strength and reliability deteriorate
Solution Approach 1:
The patent combines the touch sensor substrate and processing components into a single integrated assembly using friction welding, eliminating the need for separate assembly steps and reducing manufacturing complexity while improving reliability through direct bonding
2Strength
If conventional bonding methods are used, then manufacturing cost increases, but structural integrity deteriorates
Solution Approach 1:
The patent replaces conventional chemical bonding methods with friction welding, a mechanical bonding process that creates stronger bonds without requiring additional adhesives or complex curing processes, thereby improving structural integrity while reducing manufacturing costs
3Reliability
If complex assembly processes are used, then manufacturing time increases, but moisture protection deteriorates
Solution Approach 1:
The patent integrates moisture protection into the friction welding process itself, creating a sealed bond that prevents moisture ingress while completing the assembly in a single operation, thereby improving moisture resistance without increasing manufacturing time
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 approach results in faster, cost-effective, and more reliable touch sensor manufacturing with improved structural integrity and reduced moisture ingress, while also simplifying tooling and increasing the yield of touch-sensitive systems.
Implementation Method 1
When an object touches or comes within proximity of the surface of the capacitive touch screen, a change in capacitance may occur within the touch screen at the location of the touch or proximity.
Implementation Method 2
The circuit is mechanically coupled to the sensor via friction welding or another localized welding technique
Data Source
AI summary
In one embodiment, a system includes a touch sensor comprising a set of electrodes and a set of one or more connection pads electrically coupled to the set of electrodes. The system also includes a circuit electrically coupled to the one or more connection pads such that signals may be communicated from the set of one or more connection pads to the circuit. The system further includes the circuit mechanically coupled to the touch sensor via friction welding.