Patent ID: 11960814
Assignee: POWERCHIP SEMICONDUCTOR MANUFACTURING CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. The wafer searching method according to claim 6, wherein the first specific area is an i-th first area among the first areas, and the step of estimating the first feature values of the preset distribution features of the first specific area comprises:
estimating a first die fail ratio in the first specific area based on the failed dies and the normal dies in the first specific area;
characterizing the target wafer as a first die distribution matrix, wherein an element with a first value in the first die distribution matrix corresponds to one of the failed dies of the target wafer, and an element with a second value in the first die distribution matrix corresponds to one of the normal dies of the target wafer;
performing a convolution operation on the first die distribution matrix and a j-th feature enhancement matrix of a plurality of feature enhancement matrices to generate a j-th reference die distribution matrix among a plurality of reference die distribution matrices, wherein the j-th feature enhancement matrix corresponds to a j-th preset distribution feature among the preset distribution features;
estimating a number of j-th failed dies among a number of the failed dies based on an element with the first value in the j-th reference die distribution matrix, wherein the number of the j-th failed dies corresponds to the the j-th preset distribution feature;
estimating a j-th first feature value among the first feature values of the first specific area based on the number of the j-th failed dies and the first die fail ratio in the first specific area, wherein the j-th first feature value corresponds to the j-th preset distribution feature.