Capacitive screen and electronic equipment
A technology of capacitive screens and electrodes, which is applied in character and pattern recognition, instruments, printing image acquisition, etc., can solve the problems of low contrast between fingerprint ridges and fingerprint valleys, low signal-to-noise ratio, etc.
Pending Publication Date: 2020-10-23
VIVO MOBILE COMM CO LTD
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[0005] The purpose of the embodiments of the present application is to provide a capacitive screen that can solve the problems of low signal-to-noise ratio and low contrast between fingerprint ridges and fingerprint valleys for passive fingerprint identification solutions
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[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0025] The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein. In addition, "and / or" in the specification an...
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The invention discloses a capacitive screen and electronic equipment, and belongs to the field of fingerprint identification. Wherein the capacitive screen is composed of a plurality of pixel points,each pixel point comprises a mutual capacitor, the mutual capacitor comprises a first electrode and a second electrode which are oppositely arranged, the second electrode is a fingerprint contact electrode of the capacitive screen, and the first electrode is connected to the power supply end of the capacitive screen; the reset switch is connected between the power supply end of the capacitive screen and the second electrode; the input end of the source follower is connected with the second electrode, the output end of the source follower is the fingerprint signal output end of the pixel point,and the power supply end of the source follower is connected with the power supply end of the capacitive screen; a first switch control signal output end of the first control unit is connected with acontrol end of the source follower; and the second switch control signal output end of the second control unit is connected with the control end of the reset switch. According to the invention, the problems of low signal-to-noise ratio and low contrast of fingerprint ridges and fingerprint valleys in a passive fingerprint identification scheme are solved.
Description
technical field [0001] The application belongs to the technical field of fingerprint identification, and in particular relates to a capacitive screen and an electronic device. Background technique [0002] Capacitive fingerprint recognition technology is widely used in smart terminals, door lock security, identity records and other fields due to its advantages of good stability, simple process and low cost. [0003] At present, the principle of capacitive fingerprint recognition is as follows: figure 1 As shown, when the user's finger presses the surface of the fingerprint identification device, since the human fingerprint is in a shape of ups and downs, the fingerprint ridges are in close contact with the surface of the fingerprint identification device without leaving gaps, and the fingerprint valleys are not in close contact with the surface of the fingerprint identification device. There is an air gap. In this way, due to the difference in the contact between the finge...
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IPC IPC(8): G06K9/00
CPCG06V40/1306
Inventor 詹小舟
Owner VIVO MOBILE COMM CO LTD