Patent ID: 8627266
Filing Date: 2014-01-07
Classification: H01L

Abstract:
1. A test map classification method comprising: at least one processor which executes: wherein the calculating similarities of wafer pairs comprises: calculating the similarities using similarity indexes corresponding to predetermined coordinates of the wafer pairs, the similarity indexes being values that depend on whether chips corresponding to the predetermined coordinates are failed or good, and wherein the test map comprises a first wafer test map and a second wafer test map, classified by the wafer identifier, and wherein the similarity indexes comprises a first similarity index that indicates when both chips corresponding to any one coordinate in the first and second wafer test maps are good, a second similarity index that indicates when one chip corresponding to any one coordinate in the first and second wafer test maps is good and the other chip is failed, and a third similarity index that indicates when both chips corresponding to any one coordinate in the first and second wafer test maps are failed.