Patent ID: 7795704
Filing Date: 2010-09-14
Classification: H01L

Abstract:
1. A die seal ring, disposed in a die and surrounding an integrated circuit region of the die, and having at least three different local widths, each width being defined as a distance between an inner edge and an outer edge of the die seal ring wherein the die is subjected to different stresses at different portions thereof as being sawn from a wafer, the different stresses including, from low to high, a first stress, a second stress and a third stress, the at least three different local widths include, from small to large, a first width, a second width and a third width, wherein the first width is at a first portion of the die subjected to the first stress and is defined as a distance between substantially parallel opposite edges of the die seal ring at the first portion, the second width is at a second portion of the die subjected to the second stress and is defined as a distance between substantially parallel opposite edges of the die seal ring at the second portion, and the third width is at a third portion of the die subjected to the third stress and is defined as a distance between substantially parallel opposite edges of the die seal ring at the third portion, and at arbitrary portion of the die, the die seal ring has only one width that is defined as a distance between substantially parallel opposite edges of the die seal ring at the arbitrary portion of the die.