Patent ID: 8553122

Claim:
A solid-state image pickup device comprising: a pixel array unit including unit pixels which are two-dimensionally arranged in a matrix pattern, each unit pixel including a photoelectric converter, and column signal lines corresponding to respective columns of the matrix pattern; a row scanning unit selectively controlling each unit pixel of the pixel array unit in units of rows; a pair of column processing units, each including a plurality of analog-digital converting units, each analog-digital converting unit converting an analog signal output from a respective one of the unit pixels in each row selectively-controlled by the row scanning unit through the column signal lines to a respective digital signal, each analog-digital converting unit effectively adding together digital signals of plural pixels in a column within a horizontal scan period for one row; a pair of column scanning units controlling output of the digital signals added in the analog-digital converting unit, a first portion of the unit pixels and their analog-digital converting units associated with one of the column scanning units, a second portion of the unit pixels and their analog-digital converting units associated with the other of the column scanning units; respective selecting switches between the pixel array unit and the column scanning units; a respective pair of output lines for transmitting the digital signals output from the analog-digital converting units under control by the column scanning units; and a digital adder unit to which the output lines are connected and which adds together digital signals output from the column processing units.