Image processor and imaging device

A photographing device having a plurality of pixels, arranged on the same circuit in a matrix shape, for detecting brightness of an object, each of the pixels comprising:

• a light receiving portion for generating an electric signal corresponding to intensity of received light;
• an amplifying portion for amplifying an output signal of said light receiving portion;
• a plurality of storing portions for storing as a current signal an electric signal amplified by said amplifying portion;
• a load portion for converting current outputs of said plurality of storing portions into voltages;
• a bias portion for supplying an offset current to an input of said load portion;
• a calculating portion for calculating an output signal of said load portion;
• and
• an outputting portion for outputting a calculated result of said calculating portion.

A photographing device for detecting brightness of an object, comprising:

• a pixel area in which pixels are arranged in a matrix shape, each pixel being composed of a light receiving portion for generating an electric signal corresponding to intensity of received light and an amplifying portion for amplifying an output signal of the light receiving portion;
• a second amplifying portion area in which second amplifying portions are arranged in each column of the pixels in said pixel area, each of the second amplifying portions amplifying a current signal based on the theory of current mirror of mirror transistors that are connected so that their gate electrodes face each other;
• a pixel-outside storing area in which a plurality of storing portions are arranged in a matrix shape corresponding to the arrangement of the pixels in said pixel area, each of the storing portions storing as a current signal an electric signal that has been amplified;
• a load portion and calculating portion area in which load portions and calculating portions are arranged in each column of the pixels of said pixel area, each of the load portions converting the current output of the corresponding storing portion into a voltage, each of the calculating portions performing a calculating process;
• and
• an outputting portion area in which outputting portions are arranged in each column of the pixels of said pixel area, each of the outputting portions outputting the calculated result of the corresponding calculating portion,
• wherein said pixel area, said second amplifying portion area, said pixel-outside storing area, said load portion and calculating portion area, and said outputting portion area are disposed on the same circuit.