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Fingerprint identification driving circuit, module, touch screen and driving method

A driving circuit and fingerprint recognition technology, applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, matching and classification, etc., can solve problems such as driving transistor threshold voltage drift, driving transistor current inconsistent, affecting fingerprint recognition effect, etc. , to achieve the effect of improving the effect and avoiding the inconsistency of the threshold voltage

Active Publication Date: 2019-08-09
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the manufacturing process, the threshold voltage of the driving transistor is not uniform, and as time changes, the threshold voltage of the driving transistor will also drift, which will cause inconsistency in the output current of the driving transistor under the same DC voltage. The effect of fingerprint recognition

Method used

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  • Fingerprint identification driving circuit, module, touch screen and driving method
  • Fingerprint identification driving circuit, module, touch screen and driving method
  • Fingerprint identification driving circuit, module, touch screen and driving method

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Embodiment Construction

[0053] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0054] figure 1 It is a structural block diagram of a fingerprint recognition driving circuit provided by an embodiment of the present invention. see figure 1 , the fingerprint recognition drive circuit includes: a drive subcircuit 000, a first charge storage subcircuit 100, a second charge storage subcircuit 200, a reset subcircuit 300, a data collection subcircuit 400, a circuit compensation subcircuit 500 and an output control subcircuit 600.

[0055] Wherein, the driving sub-circuit 000 includes a driving transistor. The second charge storage sub-circuit 200 has a first terminal connected to the control electrode of the driving transistor. That is, the driving subcircuit 000 is electrically connected to the second charge storag...

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Abstract

The invention discloses a fingerprint identification driving circuit, a module, a touch screen and a driving method, and belongs to the technical field of touch control. The circuit comprises a driving transistor; a first charge storage sub-circuit; a second charge storage sub-circuit; a reset sub-circuit which is configured to reset the potential of the first end of the first charge storage sub-circuit to a first potential, and resetting the potential of the first end of the second charge storage sub-circuit to a second potential; a data acquisition sub-circuit which is configured to write the output voltage of the ultrasonic sensor into the first end of the first charge storage sub-circuit; a circuit compensation sub-circuit which is configured to charge the second charge storage sub-circuit through the first charge storage sub-circuit and the driving transistor until the potential of the first end of the second charge storage sub-circuit is the sum of the output voltage of the ultrasonic sensor and the threshold voltage of the driving transistor; and an output control sub-circuit which is configured to transmit the current signal outputted by the driving transistor to a signal reading circuit.

Description

technical field [0001] The invention relates to the field of touch technology, in particular to a fingerprint recognition drive circuit, module, touch screen and drive method. Background technique [0002] In recent years, biometric identification has gradually become the standard configuration of mobile terminals, and fingerprint identification technology has become the most widely used biometric identification technology due to its outstanding convenience and security. Fingerprint identification technology includes capacitive fingerprint identification technology, optical fingerprint identification technology and ultrasonic fingerprint identification technology. Among them, the capacitive fingerprint recognition technology and the optical fingerprint recognition technology are mostly applied to the non-display area of ​​the display screen of the mobile terminal, while the ultrasonic fingerprint recognition technology is a fingerprint recognition technology that can be appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F3/041
CPCG06F3/0412G06F3/0418G06V40/1306G06F3/0436G06F2203/04103G06F2203/04106G06F3/04166G06V40/1365G06F3/0445
Inventor 杨盛际董学陈小川王辉卢鹏程李胜男黄冠达
Owner BOE TECH GRP CO LTD
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