Abstract:
A capacitance detecting device for fingerprint identification comprises a conductive border (200), a detecting screen (100) and a detecting module (300). The detecting screen (100) comprises a plurality of detecting units (110). Each detecting unit (110) comprises a first conductive layer (111), a second conductive layer (112), a third conductive layer (113) and a fourth conductive layer (114). The detecting module (300) is configured to charge a sensing capacitance between the first conductive layer (111) and a finger (5) in contact with the detecting screen (100) and a feedback capacitance between the first conductive layer (111) and the second conductive layer (112) at a sampling stage, to control electric charges of the sensing capacitance and the feedback capacitance to transfer to an integrating capacitance between the third conductive layer (113) and the fourth conductive layer (114) at an integral stage, to measure a voltage variation of the integrating capacitance at the integral stage and to calculate the sensing capacitance according to the voltage variation. A fingerprint identification apparatus is also provided.
Abstract:
A sensor (200) for detecting a fingerprint, a fingerprint identification apparatus (20) and a controlling method of a sensor for detecting a fingerprint are provided. The sensor (200) for detecting the fingerprint includes a detecting panel (210) including: a detecting region (220) with a plurality of detecting units (221), in which the plurality of detecting units (221) are distributed in a plurality rows and columns on the detecting region (220); and a conductive layer (230), configured to form a sensing capacitance between the conductive layer (230) and a finger when the finger is close to the detecting region (220); a capacitance detecting module (240), configured to detect the sensing capacitance; and a control module (250).
Abstract:
A sensor (200) for detecting a fingerprint, a fingerprint identification apparatus (20) and a controlling method of a sensor for detecting a fingerprint are provided. The sensor (200) for detecting the fingerprint includes a detecting panel (210) including: a detecting region (220) with a plurality of detecting units (221), in which the plurality of detecting units (221) are distributed in a plurality rows and columns on the detecting region (220); and a conductive layer (230), configured to form a sensing capacitance between the conductive layer (230) and a finger when the finger is close to the detecting region (220); a capacitance detecting module (240), configured to detect the sensing capacitance; and a control module (250).
Abstract:
A capacitance detecting device for fingerprint identification comprises a conductive border (200), a detecting screen (100) and a detecting module (300). The detecting screen (100) comprises a plurality of detecting units (110). Each detecting unit (110) comprises a first conductive layer (111), a second conductive layer (112), a third conductive layer (113) and a fourth conductive layer (114). The detecting module (300) is configured to charge a sensing capacitance between the first conductive layer (111) and a finger (5) in contact with the detecting screen (100) and a feedback capacitance between the first conductive layer (111) and the second conductive layer (112) at a sampling stage, to control electric charges of the sensing capacitance and the feedback capacitance to transfer to an integrating capacitance between the third conductive layer (113) and the fourth conductive layer (114) at an integral stage, to measure a voltage variation of the integrating capacitance at the integral stage and to calculate the sensing capacitance according to the voltage variation. A fingerprint identification apparatus is also provided.