Method for establishing anisotropic conductive connection and anisotropic conductive adhesive film
View Patent ↗An anisotropic conductive adhesive film and method for anisotropically and conductively connecting a connection terminal of a circuit board to a connection portion of an electronic device ensuring the fluidity of an anisotropic conductive adhesive film during electrical connection of the connection terminals of circuit boards to the connection portions of electronic devices using the anisotropic conductive adhesive film, in such a manner that the conductive particles are effectively confined, that the pressure required for compression bonding is not increased, and that the temporary bonding of the circuit boards to the electronic devices is effected at sufficient strength.
1. A method for anisotropically and conductively connecting a connection terminal of a circuit board to a connection portion of an electronic device, the method comprising the following steps (a) through (d):
Step (a) of disposing on the circuit board an anisotropic conductive adhesive film composed of a photocurable insulative adhesive and conductive particles dispersed in the adhesive;
Step (b) of disposing on the anisotropic conductive adhesive film an exposure mask having an exposure pattern corresponding to the connection terminal of the circuit board;
Step (c) of irradiating light onto the anisotropic conductive adhesive film via the exposure mask to cause an exposed area of the anisotropic conductive adhesive film to undergo photopolymerization, thereby increasing the melt viscosity in the exposed area wherein light is irradiated onto an area of the anisotropic conductive adhesive film, the area being on or above the connection terminal of the circuit board; and
Step (d) of removing the exposure mask, then placing the connection portion of the electronic device on the anisotropic conductive adhesive film in alignment with the connection terminal of the circuit board, and then, with the two components closely held together, irradiating light onto the entire anisotropic conductive adhesive film to cause the entire film to undergo photopolymerization, thereby connecting the connection terminal of the circuit board to the connection portion of the electronic device.