Haptic feedback by electrically charging a transparent film

These “E-Sense” films developed by Senseg and Toshiba can be placed anywhere, including on a touchscreen and by charging the area the finger is on differently, you can create different sensations, such as wood, stone, unevenness, etc. This is called electrotactile feedback.

Electrotactile Arrays for Texture and Pressure Feedback During Robotic Teleoperation | Hizook.