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Fingerprint identification detection circuit, touch screen and display device

A fingerprint recognition and detection circuit technology, which is applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, electrical digital data processing, etc. Weak current, etc.

Active Publication Date: 2017-07-21
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, under very weak light conditions, the generated photocurrent is also weak. Since the first switching transistor M1 is a low-temperature polysilicon transistor, the potential of the first node A will continuously leak through the first switching transistor M1, causing the first The signal of node A cannot be accumulated, so that the detection circuit cannot perform fingerprint identification

Method used

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  • Fingerprint identification detection circuit, touch screen and display device
  • Fingerprint identification detection circuit, touch screen and display device
  • Fingerprint identification detection circuit, touch screen and display device

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementations of the fingerprint identification detection circuit, touch screen and display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] The thickness and shape of each layer of film in the drawings do not reflect the real scale of the fingerprint identification and detection circuit, and the purpose is only to schematically illustrate the content of the present invention.

[0046] The embodiment of the invention provides a fingerprint identification detection circuit, such as figure 2 As shown, it includes: a photodiode D0, a first switch transistor M1, a second switch transistor M2 and a voltage follower transistor M0; wherein,

[0047] The gate of the first switching transistor M1 is connected to the reset control terminal Reset, the first pole is connect...

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Abstract

The invention discloses a fingerprint identification detection circuit, a touch screen and a display device. The fingerprint identification detection circuit comprises a photosensitive diode, a first switch transistor, a second switch transistor and a voltage following transistor. The first switch transistor is a metallic oxide transistor. The second switch transistor and the voltage following transistor are low-temperature polycrystalline silicone transistors. According to the invention, by using the first switch transistor as the metallic oxide transistor, the leaked current of the first switch transistor is quite small and even if the light is quite weak, light current can be also detected, so detection precision of the fingerprint identification detection circuit is improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a fingerprint identification and detection circuit, a touch screen and a display device. Background technique [0002] The current fingerprint identification devices mainly include capacitive and ultrasonic types, but their common defect is that the sensing distance of the sensor is relatively short, which seriously limits the structure and performance of fingerprint identification devices, and affects their wide application in mobile terminal products. [0003] The optical fingerprint identification device has the advantage of long-distance sensing, but due to the high-resolution requirements of the optical sensor, the sensor can only be made relatively small. Since the amount of light signal is usually proportional to the area of ​​the sensor, the detected The light signal will become weaker. Therefore, an active detection circuit is usually used for fingerprint identificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F3/041
CPCG06F3/0412G06V40/1318G06V10/94
Inventor 王鹏鹏王海生丁小梁刘英明郑智仁刘伟曹学友张平李昌峰秦云科
Owner BOE TECH GRP CO LTD
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