Patent ID: 6489573
Filing Date: 2002-12-03
Classification: H01L,H05K

Abstract:
An electrode bonding structure, comprising:a substrate having a substrate dielectric layer and an indenting pad on one surface of the substrate, the substrate dielectric layer having a hole exposing an inner surface of the indenting pad, the inner surface of the indenting pad being lower than the surface of the dielectric layer by a depth H3; a circuit board having a circuit dielectric layer and a bump pad on one surface of the circuit board, the bump pad protruding through and being higher than the circuit dielectric layer by a height H1; and an anisotropic conductive film (ACF) placed upon one of the one surface of the substrate and the one surface of the circuit board, the ACF having a thickness H2; wherein the circuit board is positioned parallel to the substrate such that the one surface of the circuit board faces the one surface of the substrate and the ACF is disposed between them, and wherein the position of the indenting pad corresponds to the position of the bump pad, the height H1 is equal to or greater than the sum of the thickness H2 and the depth H3 (H1>=H2+H3) such that the ACF above the bump pad is squeezed after the substrate and the circuit board are bonded for electrically connecting the substrate and the circuit board, and the bump pad is positioned into the hole exposing the indenting pad for reducing a thermal expansion of the circuit board caused during the process for bonding the substrate and the circuit board.