At this year Touch Taiwan from August 24-26 Heraeus launches a new touch panel process to pattern Clevios conductive polymer films by DFR (dry-film resist) photolithography. The development was done together with Taiwan’s Industrial Technology Research Institute (ITRI). Heraeus will show fully functional 7 inch GFF-type touch panel demonstrators at its booth at Touch Taiwan 2016 made by the new DFR photolithography process. High resolution patterning of touch sensors is a prerequisite for advanced touch panels, especially for flexible and foldable touch displays.
“The high resolution patterning process for Clevios film is an important milestone. Our customers are implementing it rapidly. Their feedback is excellent”, says Bernd Stenger, Head of Business Line Electronic Chemicals.
With this Heraeus Innovation line widths of 50 um resolution and even lower can be achieved easily. Parameter sets and process windows for the entire process chain of Clevios touch panel manufacturing are now available for customers to implement in their productions. Clevios films and sensors do easily withstand more than 300.000 bendings at bending radii as low as 1 mm without degradation.
Top innovation: Rapid Infrared (IR) curing contributes to excellent substrates
A second innovation at Heraeus’ booth is a flexible 7 inch Clevios conductive polymer touch panel based on an ultrathin flexible polyimide substrate. Polyimide curing is the domain for Heraeus Noblelight where its customized rapid IR curing technologies come into play for the fastest and most efficient curing of ultrathin polyimide substrate films that are key materials for the next generation flexible display and touch panel substrates. Infrared emitters transfer heat contact free and at high efficiency. Compared to conventional hot air ovens curing processes can be done in few minutes rather than in hours. Additionally, without air movement any contamination is minimized. Infrared emitters that match exactly to the absorption wavelength of the material can heat up much faster. Medium wave Carbon emitters meets the absorption spectrum of Polyimide and enable rapid IR curing and drying.