Methods to Improve Accuracy of Electronic Component Positioning in Thermoformed Electronics.

Area of Science:

• Materials Science
• Electronics Engineering
• Manufacturing Technology

Background:

• Thermoformed electronics require precise component placement for functionality.
• Conventional in-mold electronics methods often result in deformed tracks and poor reproducibility.
• Maintaining substrate integrity during thermoforming is crucial for reliable electronic performance.

Purpose of the Study:

• To introduce three novel methods for accurate electronic component positioning in thermoformed electronics.
• To ensure the mechanical and electrical integrity of printed-ink tracks during the thermoforming process.
• To enhance the reproducibility and precision of component placement in 3D electronic devices.

Main Methods:

• Developed three distinct methods based on maintaining substrate regions below the glass transition temperature (Tg).
• Implemented methods in a semi-sphere mold for positioning LEDs and a capacitive touch sensor.
• Compared proposed methods against the typical in-mold electronics fabrication process.

Main Results:

• Proposed methods prevented deformation and stretching of printed-ink tracks and pads.
• Electronic components maintained conductivity and precise 3D positioning after thermoforming.
• Touch sensor shape remained consistent with the 2D design, unlike the typical process.

Conclusions:

• The presented methods enable high-precision electronic component positioning in thermoformed electronics.
• These techniques overcome limitations of conventional in-mold electronics regarding track integrity and reproducibility.
• The findings facilitate the development of reliable and complex 3D electronic devices through thermoforming.