Detection device

A detection device comprising:

• a light source configured to emit light to an object to be detected;
• a plurality of photodiodes arranged in a detection area;
• a plurality of signal lines coupled to the photodiodes;
• a plurality of detection circuits;
• and
• a coupling switching circuit configured to switch coupling of one or more of the photodiodes to one or more of the detection circuits, the coupling switching circuit being separate from each one of the plurality of detection circuits and connecting to each detection circuit via a respective output signal line, wherein
• the coupling switching circuit is configured to change a number of the detection circuits coupled to one or more of the photodiodes based on an output value from one or more of the photodiodes, and
• the coupling switching circuit comprises:
• a signal line selection circuit including a first plurality of switches and a second plurality of switches, each one of the first plurality of switches coupled to a first output signal line and a respective photodiode in a first group of photodiodes, each one of the second plurality of switches coupled to a second output signal line and a respective photodiode in a second group of photodiodes, the first output signal line being different from the second output signal line, and the first group of photodiodes being different from the second group of photodiodes, the signal line selection circuit being configured to change a number of the signal lines coupled to one output signal line;
• and
• a detection circuit selecting circuit including a plurality of switches, the plurality of switches configured to provide switching of each of the first output signal line and the second output signal line being connected with one or more detection circuits through a separate output signal line, the plurality of switches being connected to the first output signal line and the second output signal line as inputs to the detection circuit selecting circuit, the plurality of switches being connected to a third output signal line and a fourth output signal line which are respectively connected to different detection circuits, and the detection circuit selecting circuit configured to change
• a first number of the detection circuits coupled to the one output signal line to
• a second number of the detection circuits coupled to the one output signal line, where the first number and the second number are each one or more.