Figure 4.

Discrete and hidden electronics applications. Optical picture of capacitive sensors transferred to bent plastic object; (a) top-view of metallic electrodes fabricated on colorized PVA substrate. Electrodes constitute the devices sensing area. In blue, the area where part of the colored films has been etched for electrical interconnections access; (b) electrodes transferred onto a white object (discrete electronics). The inset highlights a zoom on the area where interconnects can be performed; (c) electrodes transferred onto a darker object (hidden electronics) showing electrodes interconnected with the kapton cable using anisotropic conductive film enabling external measurements; (d) electrical test setup. The marks 1, 2, and 3 highlight the backside of the capacitive sensors, the Arduino board, and LEDs to display finger displacement, respectively; (e) animated graphics showing finger movement tracking using the Arduino board and the Processing software (version 3.4).