Current amplification circuit, fingerprint detection device and control method of current amplification circuit

A current amplification and current amplifier technology, applied in charge amplifiers, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as difficult integration, and achieve the effects of easy integration, reduced resistance, and control.

Active Publication Date: 2017-11-07
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the photocurrent generated by the photodiode is usually very small, the IC needs to place a large-value resistor to pre-amplify the photocurrent to obtain the required current. However, the large-value resistor will cause device accuracy problems, which is difficult integrated into the IC

Method used

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  • Current amplification circuit, fingerprint detection device and control method of current amplification circuit
  • Current amplification circuit, fingerprint detection device and control method of current amplification circuit
  • Current amplification circuit, fingerprint detection device and control method of current amplification circuit

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Embodiment Construction

[0056] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the machine or element referred to must have a specific orientation, use a specific Azimuth configuration and operation, therefore, should not be construed as limiting the invention.

[0058] In the description of the present invention, it should be noted that unless otherwise ...

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Abstract

The invention provides a current amplification circuit, a fingerprint detection device and a control method of the current amplification circuit. The current amplification circuit comprises a voltage control unit, a current amplifier and current amplification units arranged in an array, each current amplification unit comprises a current mirror, each current mirror is separately and electrically connected with a voltage input end, the voltage control unit and a reverse-phase input end of the current amplifier, a positive-phase input end of the current amplifier and the voltage input end are electrically connected, and the voltage control unit outputs voltage control signals to the current mirrors respectively controlling the current mirrors to amplify currents input from the voltage input end. Primary amplification processing is performed on the currents flowing from the voltage input end by using the current mirrors, so a current amplification times needed when secondary amplification processing for the currents is performed by the current amplifier is effectively reduced; and, the current amplification circuit provided in the invention can effectively reduce a resistance value of a resistor for amplifying a current in a current amplifier on an integrated circuit chip on the basis that the current amplifier is usually integrated onto the integrated circuit chip.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a current amplification circuit, a fingerprint detection device and a control method thereof. Background technique [0002] With the rapid development of science and technology, mobile products with biometric identification functions have gradually entered people's lives and work. Due to the uniqueness of human fingerprints, fingerprint identification technology has attracted much attention and research. At present, the push-type fingerprint recognition technology and the slide-type fingerprint recognition technology based on silicon-based technology have been integrated into mobile products, and the corresponding terminal functions can be performed through fingerprint recognition in the non-display area of ​​the mobile terminal, such as screen recognition by fingerprint recognition. For the unlocking function, the core of people's attention in the future is to apply fingerprint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00H03F3/08G06V40/13
CPCH03F3/08G06V40/1306H03F3/082H03F2200/129H03F2200/228H03F3/70H03F2200/474H03F2200/462G06V40/13G06V40/1318
Inventor 丁小梁王海生刘英明曹学友张平韩艳玲
Owner BOE TECH GRP CO LTD
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