ACF Film for Photon M7 Pro M7 M5s Pro M5s 1PCS

ACF is the initialism for “Anisotropic Conductive Film” or “Anisotropic Conductive Adhesive Film.” It is made of resins, such as thermoset epoxy resin, in which conductive particles are dispersed. ACF fixed by thermocompression bonding can achieve conductivity vertically, or in the direction of compression, and insulation quality horizontally, or in the perpendicular direction to compression, and because of its anisotropic nature, the material is referred to as “Anisotropic Conductive Film.”

ACF is found in almost all devices with a flat panel display, including smartphones, tablets, PCs, and televisions. The film is used to electrically connect the electrodes of the glass substrates of LCDs or OLED displays and the electrodes of IC chips or flexible substrate circuits, and also physically fixes them.

ACF is about 10-45μm thick and 0.4-20mm wide. To connect the electrodes of the devices described above, ACF is placed between the electrodes and thermocompression is applied. Through this process, conductive particles are compressed, touch one another, and form a conductive path between the upper and lower electrodes. Meanwhile, some particles remain uncompressed and dispersed in the resin, maintaining the electrodes’ insulation quality in a horizontal direction. As the resin hardens in this state, the electrodes also become physically joined, fixed, and sealed.

Compared with bonding by solder or connector parts, the use of ACF in connecting electrodes (hereinafter, “ACF connection”) can make the combined area smaller, thinner, flatter, and the pitches narrower. Other notable merits include the simultaneous connection of multiple electrodes. ACF also works at low temperatures between roughly 100 and 240 degrees Celsius and in a short time of 4 to 60 seconds.