Patent ID: 7139026

Claim:
An imaging device for reading a pixel level by supplying a read current to a pixel circuit constituting an array column of a pixel array, said imaging device comprising: a read current source unit having for each array column a current copier circuit for supplying the read current to the array column; a memory for storing the pixel level read from said pixel circuit; a calculating circuit for obtaining a pixel output of said pixel circuit using the pixel level supplied from said memory; and a scanner for causing said read current source unit to supply the read current to the array column including the pixel circuit from which the pixel output is to be read, for causing said memory to store the pixel level of said pixel circuit, and for causing said calculating circuit to obtain the pixel output by reading the output level from said memory, wherein said current copier circuit has a current copier transistor and a capacitor that stores a gate potential of said current copier transistor.