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The progress of screen printing towards fine line printing has been incredible going from 100 µm features before 2010 to 70 µm to 2015 to 40 µm in 2018 and now pushing - in development- towards 20 µm and less. In parallel, the wet thickness of the printed line have gone down from 12um or so in 2018 to now just 4um.
As microLEDs inevitably shrink in size, the micro-bumping requirements for the microLED dies becomes more challenging. Direct wafer-based printing based on gravure offset techniques offers a promising solution in this regard. Indeed, this is another field where printed electronics can play a role.
The three themes are closely linked since QDs can be digitally printed as color conversation materials atop blue microLEDs to enable wide color gamut RGB uLED displays without requiring a separate transfer step for each color.. This is an important technology as it simplifies the manufacturing step for microLED and thus removing a major hinderence.
Phosphors or QDs for color conversion in LCD and microLED ? Which will win? This is an evolving technology space to watch. Here, it is shown that phosphor technology is evolving, enabling not just red but also green narrowband color conversation with small particle sizes compatible with microLEDs
2 minutes read
Molecular particle free inks can offer extreme formability and stretchability, allowing the design and production of 3D shaped and/or in-mold electronics parts with extreme curvatures and complex shapes.
How to overcome the traditional limits of LDS (laser direct structuring) to metallize 2D and 3D objects made from all kinds of surfaces?
It is incredible to see the progress that organic semiconductors (OSC) have made over the past 15-20 years. Ian Jenks explains in this short 5-min presentation how they are removing the long-existing barriers to adoption of OTFT technology.
Gallium-Indium-Tin is an interesting material for stretchable electronics. It can be formed into a non-toxic RoHS-compliant gel and applied to almost any substrate to form stretchable conductive metallizations and circuits.
Screen printing never ceases to advance and is entering into ultrafine line printing territory. FERNANDO ZICARELLI explains in this short 5-min talks important considerations to achieve fineline printing and further push the resolution down:
Here, the additive nature of the process means that the production process is environmentally friendlier and does not involve etching chemicals. Furthermore, the digital nature of the patterning (inkjet printing) means that designs can be changed faster.
We first discuss emerging and existing applications for ultra fineline screen printing, outlining how evolution of screen printing can unlock various electronic applications. Next, it will review other printing technologies extending the linewidth resolution to sub-micron range
