Photoelectric conversion device and image sensor
View Patent ↗To provide a small-area photoelectric conversion device without impairing a resolution switching function, signals for controlling output order control switches provided so as to correspond to photoelectric conversion elements are selected by an output order control circuit and a shift register. In this manner, the number of flip-flops forming a shift register is reduced.
1. A photoelectric conversion device, comprising:
a photoelectric conversion block including:
a plurality of photoelectric conversion elements for outputting electrical signals in accordance with incident light; and
a plurality of capacitors for storing the electrical signals of the plurality of photoelectric conversion elements;
a light reception signal control switch block including a plurality of light reception signal control switches for reading out the electrical signals stored in the plurality of capacitors to a common readout line;
an output order control switch block including n units including j output order control switches for controlling an on and off state of the plurality of light reception signal control switches, where n and j are each a natural number of 2 or more;
an output order control circuit for outputting an output order control signal for sequentially turning on the j output order control switches; and
a shift register comprising n flip-flops circuits for outputting, to the n units, a shift register control signal for sequentially turning on the j output order control switches, where the number n of the flip-flop circuits is less than the number j of the output order control switch units.
2. A photoelectric conversion device according to claim 1 , wherein the n flip-flops sequentially output the shift register control signal.
3. A photoelectric conversion device according to claim 2 , further comprising:
an output terminal for outputting the shift register control signal of a k-th flip-flop, where 1≦k≦n;
an input terminal connected to the output terminal; and
a logic circuit for generating the output order control signal and the shift register control signal based on the shift register control signal input to the input terminal.
4. A photoelectric conversion device according to claim 3 , further comprising a second input terminal for inputting a chip select signal, wherein the logic circuit has a function of detecting whether the photoelectric conversion device is a first photoelectric conversion device or a second or subsequent photoelectric conversion device based on the chip select signal.
5. An image sensor, comprising a plurality of the photoelectric conversion devices according to claim 1 , which are connected to each other.