Anisotropic conductive film
Anisotropic conductive film (ACF) is an adhesive interconnect system that is commonly used in panel display manufacturing, including liquid crystal displays (LCDs) and organic light-emitting diode (OLED) technology. In display manufacturing, ACF facilitates the electrical and mechanical connections between the driver electronics and substrates.
Source: Wikipedia — Anisotropic conductive film (CC BY-SA 4.0)