Patent ID: 6316286
Filing Date: 2001-11-13
Classification: G02B,H01L

Abstract:
A method of equalizing device heights on a chip comprising:providing on a first chip an array of first devices having a predetermined height including dummy devices with bonding bumps;bump bonding said first chip to a second chip having bonding bumps by engaging the bonding bumps on said first chip with those on said second chip;removing said dummy devices to create holes containing the multiple bumps previously associated with the dummy devices;providing on a third chip an array of second devices having a lower height than said first devices with bonding bumps which match those in the holes; andbump bonding said third chip to said second chip with the said second devices in said holes and said bonding bumps on said second devices combining with said multiple bumps in said holes to equalize the height of said first and second devices.