Title:
FINGERPRINT SENSOR AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/215560
Kind Code:
A1
Abstract:
A fingerprint sensor and an electronic device. The fingerprint sensor (100) comprises a plurality of sensing electrodes (102), a protective layer (104) and a plurality of operational amplifiers (106). The protective layer (104) is on the same layer as the plurality of sensing electrodes (102), the protective layer (104) is arranged around each sensing electrode (102), the protective layer (104) is connected to a reference ground (200), and the reference ground (200) is used for loading a varying reference signal. Each operational amplifier (106) comprises an amplifier (108) and a feedback branch (110); and the amplifier (108) comprises a non-inverting end (V+), an inverting end (V-) and an output end (V0), wherein the inverting end (V-) is connected to corresponding sensing electrodes (102), the feedback branch (110) is connected between the inverting end (V-) and the output end (V0), and the non-inverting end (V+) is directly or indirectly connected to the reference ground (200) to make the pressure differential between the plurality of sensing electrodes (102) and the protective layer (104) remain unchanged. In the fingerprint sensor (100), when the electrostatic discharge phenomenon occurs on the surface of the fingerprint sensor (100), the electrostatic energy can be released to the reference ground (200) through the protective layer (104), and in this way, the capability for the fingerprint sensor (100) to resist ESD can be improved. The pressure differential between the sensing electrodes (102) and the protective layer (104) remains unchanged, so that the sensitivity of the fingerprint sensor (100) is not affected.
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Inventors:
WANG XIAOMING (CN)
Application Number:
PCT/CN2017/087917
Publication Date:
December 21, 2017
Filing Date:
June 12, 2017
Export Citation:
Assignee:
SHENZHEN XINWEI TECH CO LTD (CN)
International Classes:
G06K9/00; G06F21/32
Foreign References:
| TWI533235B | 2016-05-11 | |||
| CN105138986A | 2015-12-09 | |||
| CN205983499U | 2017-02-22 | |||
| CN106778462A | 2017-05-31 |
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