Image pickup element, control method, and image pickup device

A control method comprising:

• setting offsets of respective ramp signals of a plurality of A/D converters, wherein each column of a pixel array is allocated its own one of the plurality of A/D converters;
• performing A/D conversion to pixel signals read from pixels of columns by using different ramp signals, to be values different from each other, wherein each A/D converter of the plurality of A/D converters allocated to each column has a different ramp signal and wherein each column includes a dummy pixel that indicates a reading mode;
• reading a pixel signal from a pixel of a line to be processed in each column of the pixel array;
• and
• performing A/D conversion to the pixel signals read from the pixels by the plurality of A/D converters allocated to the column.

An image pickup device comprising:

• an imaging unit configured to image an object;
• and
• an image processing unit configured to perform image processing to image data imaged by the imaging unit, wherein
• the imaging unit includes a pixel array, and a plurality of A/D converters, wherein each column of the pixel array is allocated its own one of the plurality of A/D converters, and each A/D converter of the plurality of A/D converters performs A/D conversion to a pixel signal read from a pixel of a column by using a different ramp signal, wherein each column includes a dummy pixel that indicates a reading mode, and a control unit which performs control to set an offset of the ramp signal of each A/D converter of the plurality of A/D converters to be a different value, to read the pixel signal from the pixel of a line to be processed in each column of the pixel array, and to perform A/D conversion to the pixel signal read from the pixel.