Detection substrate and flat panel detector

A detection substrate, comprising a base substrate with a detection area and a peripheral area outside the detection area, and a plurality of pixel units distributed in an array in the detection area;

• wherein each pixel unit comprises:
• a thin film transistor at a side of the base substrate;
• a photoelectric conversion device at a side of the thin film transistor facing away from the base substrate, wherein a bottom electrode of the photoelectric conversion device is electrically connected with a source electrode of the thin film transistor;
• a first bias voltage line at a side of the photoelectric conversion device facing away from the base substrate, wherein the first bias voltage line is electrically connected with a top electrode of the photoelectric conversion device;
• and
• a compensation capacitor, comprising:
• the bottom electrode, a dielectric layer at a side of the bottom electrode facing the base substrate, and a compensation electrode at a side of the dielectric layer facing the base substrate;
• wherein, in the peripheral area, the detection substrate comprises:
• a plurality of first conductive layers arranged in a same layer as the compensation electrode, and a second bias voltage line arranged in a same layer as the first bias voltage line;
• wherein at least one first conductive layer is electrically connected with at least one column of compensation electrodes, the second bias voltage line is electrically connected with the first bias voltage line, and the first conductive layer is electrically connected with the second bias voltage line.