A detection circuit, comprising: a driving circuit , a cancelling circuit , and a switching circuit ; the driving circuit comprises at least one driving module ; each driving module is coupled to at least one detection capacitor and is configured to periodically charge the one detection capacitor ; the cancelling circuit comprises at least one cancelling module ; each cancelling module is coupled to the one detection capacitor and is configured to cancel an initial capacitance of the one detection capacitor by charge transfer in two directions; and the switching circuit comprises at least one switching module ; the each cancelling module is further coupled to one switching module which is configured to, after the initial capacitance of the one detection capacitor is cancelled, convert a capacitive signal of the one detection capacitor to a voltage signal and output; wherein the each cancelling module comprises: a cancelling voltage source , a first cancelling capacitor , a third switch , a fourth switch , a fifth switch , a sixth switch , and a seventh switch ; one terminal of the first cancelling capacitor is coupled to the one detection capacitor through the third switch ; the one terminal of the first cancelling capacitor is also coupled to the cancelling voltage source through the fourth switch , and is also coupled to the ground through the fifth switch ; and the other terminal of the first cancelling capacitor is also coupled to the cancelling voltage source through the seventh switch , and is also coupled to the ground through the sixth switch ; wherein the each driving module comprises: a driving voltage source , a first switch , and a second switch ; the driving voltage source is coupled to one terminal of the one detection capacitor through the first switch ; the other terminal of the one detection capacitor is coupled to a ground; and the one terminal of the one detection capacitor is also coupled to the ground through the second switch . the driving circuit comprises at least one driving module ; each driving module is coupled to at least one detection capacitor and is configured to periodically charge the one detection capacitor ; the cancelling circuit comprises at least one cancelling module ; each cancelling module is coupled to the one detection capacitor and is configured to cancel an initial capacitance of the one detection capacitor by charge transfer in two directions; and the switching circuit comprises at least one switching module ; the each cancelling module is further coupled to one switching module which is configured to, after the initial capacitance of the one detection capacitor is cancelled, convert a capacitive signal of the one detection capacitor to a voltage signal and output; wherein the each cancelling module comprises: a cancelling voltage source , a first cancelling capacitor , a third switch , a fourth switch , a fifth switch , a sixth switch , and a seventh switch ; one terminal of the first cancelling capacitor is coupled to the one detection capacitor through the third switch ; the one terminal of the first cancelling capacitor is also coupled to the cancelling voltage source through the fourth switch , and is also coupled to the ground through the fifth switch ; and the other terminal of the first cancelling capacitor is also coupled to the cancelling voltage source through the seventh switch , and is also coupled to the ground through the sixth switch ; wherein the each driving module comprises: a driving voltage source , a first switch , and a second switch ; the driving voltage source is coupled to one terminal of the one detection capacitor through the first switch ; the other terminal of the one detection capacitor is coupled to a ground; and the one terminal of the one detection capacitor is also coupled to the ground through the second switch . <EOS>