CAPACITANCE DETECTING DEVICE FOR FINGERPRINT IDENTIFICATION AND FINGERPRINT IDENTIFICATION APPARATUS COMPRISING THE SAME

WIPO Patent Application WO/2015/096807

A1

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.

ZHANG ZIBAO (CN)
ZHANG JIE (CN)
YANG YUN (CN)

PCT/CN2014/095134

July 02, 2015

December 26, 2014

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BYD CO LTD (CN)

G06K9/00; G01D5/24

CN203964928U	2014-11-26
US20080069413A1	2008-03-20
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CN101526988A	2009-09-09
CN101727575A	2010-06-09
CN203102316U	2013-07-31
US6681033B1	2004-01-20
US20090123039A1	2009-05-14
EP1308878A2	2003-05-07

See also references of EP 3087349A4

TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)

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