LED array modules by new technology microbump bonding method

An LED array module was developed by using the microbump bonding method by which the electrodes of LSI chips and circuit substrate are press-bonded by utilizing the shrinkage stress produced in a light setting insulating resin. The LED array module has a resolution of 400 DPI, and is constructed by face-down mounting of 54 each of the LED chips and driver LSIs on a glass substrate. These LED chips, having an electrode pitch of 63.5 mu m, are disposed on the glass substrate at a pitch of 10 mu m. A dedicated bonder was developed for this assembling work. A report on the LED array module assembling process and the construction of a bonder is presented.<
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