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公开(公告)号：US10216974B2
公开(公告)日：2019-02-26
申请号：US15611839
申请日：2017-06-02
发明人： Chi Chou Lin , Zheng Ping He
IPC分类号： G06K9/00
摘要： A noised-reduced capacitive image sensor and a method operating the capacitive image sensor are provided. In order to generate a noise-reduced image of a fingerprint, the capacitive image sensor has an array of capacitive sensing units which each has a protective layer; a sensing electrode; a voltage follower; a comparative capacitor; and a bias voltage supply circuit. The comparative capacitor, a portion of the bias voltage supply circuit, and the voltage follower are formed in an isolated well which is configured in such a way that current is able to be prevented from flowing across an interface in the isolated well and surrounding structures. The driving source is connected to a bulk node of the isolated well such that well potential of the isolated well equals to the output electric potential of a driving source.
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公开(公告)号：US10185864B1
公开(公告)日：2019-01-22
申请号：US15641395
申请日：2017-07-05
发明人： Chi Chou Lin , Zheng Ping He
摘要： A fingerprint sensing device and a method operating the fingerprint sensing device are provided. The fingerprint sensing device includes at least one sensing core, a system unit, at least one switching unit and a charge holding unit. The switching unit is connected between the sensing core and the system unit to provide four different operation states: a normal state; an isolation state; a drive-up state; and a drive-down state. A voltage shift between the finger and the sensing core is generated by controlling the switching unit to perform different operation states in various orders.
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公开(公告)号：US10146986B1
公开(公告)日：2018-12-04
申请号：US15662388
申请日：2017-07-28
发明人： Chi Chou Lin , Zheng Ping He
IPC分类号： G06K9/00
摘要： A capacitive image sensor and a method for operating the capacitive image sensor are provided. The capacitive image sensor has an array of capacitive sensing units for transforming a distance between each of the capacitive sensing units and a surface of an adjacent finger into an output electric potential. The capacitive sensing unit comprises: a protective layer; a first sensing plate, formed under the protective layer; a second sensing plate, formed under the first sensing plate; an active semiconductor circuitry, formed under the second sensing plate and connected to the first and second sensing plates; at least one first insulating layer, formed between the first sensing plate and the second sensing plate; and at least one second insulating layer, formed between the second sensing plate and the active semiconductor circuitry.
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公开(公告)号：US10346665B2
公开(公告)日：2019-07-09
申请号：US15607703
申请日：2017-05-30
发明人： Chi Chou Lin , Zheng Ping He
IPC分类号： G06K9/00 , G06K9/40 , A61B5/1172 , G06F3/044 , G06F3/041 , A61B5/00 , A61B5/0428
摘要： A noised-reduced capacitive image sensor and a method operating the capacitive image sensor are provided. The capacitive image sensor includes: a number of capacitive sensing units forming an array, each capacitive sensing unit for transforming a distance between a portion of a surface of an approaching finger and a top surface thereof into an output electric potential, wherein a value of the output electric potential is changed by a driving signal applied to the sensing unit; at least one sample-and-hold circuit for capturing and retaining different output electric potentials; at least one signal conditioning circuit, each comprising at least one differential amplifier for amplifying a difference between two electric potentials retained by the sample-and-hold circuit; and a driving source, for providing the driving signal to the capacitive sensing units.
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公开(公告)号：US10205895B2
公开(公告)日：2019-02-12
申请号：US15641363
申请日：2017-07-05
发明人： Chi Chou Lin , Zheng Ping He
摘要： A capacitive image sensor with noise reduction feature and a method operating the capacitive image sensor are provided. The capacitive image sensor includes: a number of capacitive sensing units, arranged in a form of an array, wherein each of the number of capacitive sensing units switches between three states: sensing state, idle state, and emitting state; a driving source, for providing a driving signal to an adjacent finger overlying the number of capacitive sensing units through the number of capacitive sensing units which are in the emitting state; a number of driving switches, each connected between one of the number of capacitive sensing units and the driving source; and a control and timing logic, connected to each of the number of driving switches, for controlling the state of each of the number of capacitive sensing units.
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