| 摘要 |
The present invention is applied to the technical field of fingerprint identification, and provided is a pixel sensing circuit. The pixel sensing circuit is in a fingerprint identification mode or a noise detection mode, and comprises: a capacitance sensing layer; a plurality of shielding layers containing a first-type shielding layer and a second-type shielding layer, wherein the second-type shielding layer is coupled to a grounding end; and a charging circuit coupled to the capacitance sensing layer and the first-type shielding layer and containing a positive voltage generator used for providing a positive voltage, wherein the charging circuit periodically provides the positive voltage to the capacitance sensing layer and the first-type shielding layer when in the fingerprint identification mode, and the charging circuit disconnects a connection between the positive voltage generator and the capacitance sensing layer and first-type shielding layer, and the charging circuit periodically outputs a voltage of the capacitance sensing layer to a first output end when in the noise detection mode. The present invention integrates a noise detection function into a pixel sensing circuit for fingerprint identification, so that the pixel sensing circuit can be operated in a fingerprint identification mode or a noise detection mode, thereby improving the accuracy of fingerprint identification. |
