A display panel, comprising: a silicon-based substrate , comprising a display region and a peripheral region surrounding the display region; a driving layer , formed in the silicon-based substrate , and comprising a plurality of first transistors located in the display region; a first electrode layer, disposed on a side of the driving layer away from the silicon-based substrate , and comprising a plurality of first electrodes located in the display region, and each of the first electrodes is electrically connected to each of the first transistors; an organic light emitting layer , disposed on a side of the first electrode layer away from the driving layer ; a second electrode layer , disposed on a side of the organic light emitting layer away from the driving layer , and comprising a second electrode located in the display region and an electrode ring located in the peripheral region, the electrode ring surrounds the second electrode and is connected to the second electrode ; a plurality of pads, located in the peripheral region at at least one side of the display region, the plurality of pads comprising a display signal access pad and a test signal access pad, and the test signal access pad being located at both sides of the display signal access pad; wherein the display signal access pad is configured to access the display signal during a display phase, and the test signal access pad is configured to access the test signal during a test phase, the test signal access pad at least comprises a first group of test phase access pads, and the first group of test phase access pads comprises a first pad and a second pad , the first pad is electrically connected with the electrode ring , and the second pad is electrically connected with the silicon-based substrate . a silicon-based substrate , comprising a display region and a peripheral region surrounding the display region; a driving layer , formed in the silicon-based substrate , and comprising a plurality of first transistors located in the display region; a first electrode layer, disposed on a side of the driving layer away from the silicon-based substrate , and comprising a plurality of first electrodes located in the display region, and each of the first electrodes is electrically connected to each of the first transistors; an organic light emitting layer , disposed on a side of the first electrode layer away from the driving layer ; a second electrode layer , disposed on a side of the organic light emitting layer away from the driving layer , and comprising a second electrode located in the display region and an electrode ring located in the peripheral region, the electrode ring surrounds the second electrode and is connected to the second electrode ; a plurality of pads, located in the peripheral region at at least one side of the display region, the plurality of pads comprising a display signal access pad and a test signal access pad, and the test signal access pad being located at both sides of the display signal access pad; wherein the display signal access pad is configured to access the display signal during a display phase, and the test signal access pad is configured to access the test signal during a test phase, the test signal access pad at least comprises a first group of test phase access pads, and the first group of test phase access pads comprises a first pad and a second pad , the first pad is electrically connected with the electrode ring , and the second pad is electrically connected with the silicon-based substrate . <EOS>