Fine pitch "NCF-type Compliant-bumped COG"

Abstract

Non-Conductive-Film (NCF) type of Chip-on-Glass (COG) bonding method ensures the micro-order direct bonding between the IC electrode and glass substrate electrode. The binding force of the applied adhesive achieves electrical connections between the bumps on the IC chip and the electrodes on the glass substrate. The mathematical calculation results of bump stress and bump deformation are used to identify the environmental temperature range for the given COG bonding structure. Both of the calculation and experimental results demonstrate the feasibility of using the compliant bumps to achieve a high compressive stress, high bump deformation and low as well as stable connection resistance at various environmental temperatures. The 1,000 hrs 85 degrees C/85%RH reliability test result will be indicated.