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Inkjet fabrication of silver patterns on paper and fabric for thermochromic responsive displays

초록/요약

The fabric-based display has been fabricated by printing of silver precursor ink and thermochromatic (TC) dye ink subsequently on the very rough texture surface of polyester fabrics, which is weaved in warp and weft interlacing, after being pre-coated with polycaprolactone (PCL) nanofibers by using electrospinning. Colorimetric response of a pixel-like printed segment of TC, was activated by heat via an underneath printed silver heater electrode. Therefore, instead of any active emitting light display, which required a backlight, this display was the passive reflective display working by the reflection of the environment light, such as a paper book and newspaper. Additionally, using the similar method except the different silver nanoparticle ink and no pre-coating, the paper-based display was fabricated to demonstrate the monochromatic seven-segment numeric display and a actively color changing fine art drawing, revealing the chameleonic property of a smart flexible display capable to show dynamic change in colorful paper. Thermal, electrical and chemical properties of the TC material and the fabric heater have been investigated by using various experiment instruments. We observed the structure change of crystal violet lactone (CVL) dye by an additive developer in phase transition of polymer solvent in a microcapsule during heating, which is corresponding to the color changing mechanism of TC ink. Two flexible displays are applicable to the small wearable display to represent the text and graphical images.

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