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A fingerprint identification sensor, its preparation method, and display device

A fingerprint recognition and sensor technology, which is applied in radiation control devices, character and pattern recognition, and acquisition/organization of fingerprints/palmprints. minor issues

Active Publication Date: 2021-01-22
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a fingerprint identification sensor, its preparation method, and a display device, so as to solve the problem that the photosensitive device and the thin film transistor are arranged adjacent to each other in the existing fingerprint identification sensor, so that the installation space of the photosensitive device is small, resulting in the effective fingerprint identification sensor. The photosensitive area is small and the accuracy of fingerprint recognition is low

Method used

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  • A fingerprint identification sensor, its preparation method, and display device
  • A fingerprint identification sensor, its preparation method, and display device
  • A fingerprint identification sensor, its preparation method, and display device

Examples

Experimental program
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Embodiment 1

[0073] Figure 4 It shows a schematic cross-sectional view of a fingerprint identification sensor according to Embodiment 1 of the present invention, refer to Figure 4 The fingerprint recognition sensor may include a base substrate 10 , a thin film transistor 20 (Thin Film Transistor, TFT) and a photosensitive device 30 , and the thin film transistor 20 , the base substrate 10 and the photosensitive device 30 are stacked along the thickness direction of the base substrate 10 . Wherein, the base substrate 10 may include a conductive structure 11 penetrating through the base substrate 10 in the thickness direction of the base substrate 10 , and the photosensitive device 30 may be connected to the thin film transistor 20 through the conductive structure 11 of the base substrate 10 . Wherein, the thin film transistor 20 can be used to release the photogenerated charge generated by the photosensitive device 30 .

[0074] Regarding problem 1 arising from related technologies, in t...

Embodiment 2

[0091] refer to Figure 7 , which shows a flow chart of the steps of a method for manufacturing a fingerprint recognition sensor according to Embodiment 2 of the present invention, the method may include the following steps:

[0092] Step 701: Provide a base substrate; the base substrate includes a conductive structure penetrating through the base substrate in a thickness direction of the base substrate.

[0093] In the embodiment of the present invention, through holes can be formed on the base substrate 10 along the thickness direction of the base substrate 10 by means of laser drilling, etc., and then conductive materials, such as copper metal, can be electroformed in the through holes, Thereby, the conductive structure 11 penetrating the base substrate 10 in the thickness direction of the base substrate 10 can be obtained, that is, the base substrate 10 having the conductive structure 11 can be obtained, such as Figure 8 shown. Of course, it is also possible to directly...

Embodiment 3

[0134] The embodiment of the present invention also discloses a display device, including the above-mentioned fingerprint recognition sensor.

[0135] In the embodiment of the present invention, the fingerprint identification sensor in the display device may include a base substrate, a thin film transistor and a photosensitive device, and the thin film transistor, the base substrate and the photosensitive device are stacked along the thickness direction of the base substrate. Wherein, the base substrate includes a conductive structure penetrating through the base substrate in the thickness direction of the base substrate, and the photosensitive device can be connected to the thin film transistor through the conductive structure of the base substrate. In the embodiment of the present invention, the thin film transistor, the base substrate, and the photosensitive device are stacked along the thickness direction of the base substrate, that is, the thin film transistor and the phot...

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PUM

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Abstract

The invention provides a fingerprint identification sensor, a preparation method thereof, and a display device, and relates to the technical field of fingerprint identification. Wherein, the fingerprint identification sensor includes a thin film transistor, a base substrate, and a photosensitive device stacked along the thickness direction of the base substrate; wherein, the base substrate includes a conductive structure penetrating the base substrate in the thickness direction of the base substrate, and the photosensitive device The conductive structure of the base substrate is connected with the thin film transistor. In the present invention, the thin film transistor, the substrate, and the photosensitive device are stacked along the thickness direction of the substrate, that is, the thin film transistor and the photosensitive device can be respectively arranged on two opposite surfaces of the substrate, and both can pass through the substrate. The conductive structure of the base substrate is electrically connected to realize the control of the photosensitive device. Therefore, it is not necessary to compress the installation space of the photosensitive device when arranging the thin film transistor, so that the effective photosensitive area of ​​the photosensitive device can be increased, thereby improving the accuracy of fingerprint recognition.

Description

technical field [0001] The invention relates to the technical field of fingerprint identification, in particular to a fingerprint identification sensor, a preparation method thereof, and a display device. Background technique [0002] Nowadays, more and more electronic devices are equipped with OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) display devices, and users have put forward higher requirements for the safety performance of electronic devices. Therefore, security verification functions such as fingerprint recognition, are increasingly integrated into OLED display devices. [0003] In the current OLED display device, the fingerprint recognition sensor may include photosensitive devices and thin film transistors arranged adjacently. The effective photosensitive area of ​​the fingerprint recognition sensor is all derived from the photosensitive device, therefore, the setting space of the photosensitive device is compressed, which will lead to a smal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/146G06K9/00
CPCH01L27/1461H01L27/14612H01L27/14638H01L27/14683G06V40/1318H01L27/14678
Inventor 李士佩赵影顾仁权何伟吴慧利尹东升徐胜张立震赵雪飞贺芳高宇鹏
Owner BOE TECH GRP CO LTD