The present disclosure relates to a TFT array substrate and a display panel including the same. The TFT array substrate includes a first substrate and a circuit layer disposed on a side of the first substrate; wherein the circuit layer comprises a first electrode layer, an insulating layer, a first pad layer, and a planarization layer; the first electrode layer comprises a plurality of first electrodes disposed on the side of the first substrate, and the first electrodes are electrodes of thin film transistors in the TFT array substrate; the insulating layer is disposed on a side of the first electrode layer away from the first substrate; the first pad layer comprises a plurality of first pads disposed on a side of the insulating layer away from the first electrode layer; the plurality of first pads are electrically connected to the plurality of first electrodes through contact holes respectively penetrating the insulating layer; the planarization layer is disposed on the side of the insulating layer away from the first electrode layer; the insulating layer is provided with a plurality of trenches, and a projection of each of the trenches on the first substrate respectively covers a projection of a corresponding edge of the first pads on the first substrate.