CN110688899B - Fingerprint identification device - Google Patents

Abstract

A fingerprint identification device of the present invention includes a thin film transistor substrate with first and second sides, a plurality of fingerprint thin film transistor switches, a plurality of sensing electrodes, a plurality of signal lines and a plurality of data lines. The plurality of fingerprint thin films The transistor switch is disposed on the first side, each of the two sensing electrodes corresponds to at least two fingerprint thin film transistor switches, and a first sensing electrode in each of the two sensing electrodes is electrically connected to the at least two fingerprint thin film transistor switches. In the crystal switch, a second sensing electrode is electrically connected to a ground terminal, and the plurality of signal lines and the plurality of data lines are electrically connected to the at least two fingerprint thin film transistors respectively; through this design, the cost can be reduced.

Description

Fingerprint identification device

Technical field

The present invention relates to a fingerprint identification device, in particular to a fingerprint identification device that can reduce costs.

Background technique

Fingerprint recognition modules have gradually become one of the standard features of electronic devices. Users can use fingerprint recognition modules to identify their identities to unlock electronic devices or to operate applications.

In order to allow users to use electronic devices more conveniently, it has become a trend to simplify input operations on electronic devices. Therefore, touch input modules have gradually replaced keyboard input modules. In some electronic devices, such as smartphones, display modules with touch input functions have completely replaced button input. In electronic devices with a buttonless design, the fingerprint recognition module is usually placed under the display module. In this way, the user can place their finger on the display area of the display module for fingerprint recognition.

In the prior art, for example, US Patent Publication No. US2018239941A1 relates to a semiconductor fingerprint sensor (ie, optical fingerprint sensor) installed under the display. In its specification, an arrangement structure of an optical fingerprint sensor under a display for mitigating the moiré effect is proposed. The electronic device includes a display, and the display (such as an OLED display) includes rows of picture element elements. rows of pixel elements parallel to a first principal direction along a third axis; and an optical sensor mounted below the display to receive reflections from a user's finger print through the optical sensor Return the light source to sense the fingerprint for imaging.

But it extends to another problem, that is, since the optical fingerprint sensor is installed below the display panel, the optical fingerprint sensor must project the light generated by the RGB light-emitting diodes in the upper OLED display onto the upper surface of the touch OLED display. After receiving the fingerprint, the optical fingerprint sensor needs to wait for reflection from the fingerprint before it can sense the fingerprint image. This makes the entire light source path long and complicated in the process of obtaining fingerprint imaging, and the light source is also susceptible to other internal or external factors. In addition to interference (such as interference from the internal structure of the OLED display or interference from external light), and the user's finger directly touches the OLED display panel instead of directly touching the optical fingerprint sensor, resulting in poor recognition accuracy and poor recognition time. growth, and the overall price is quite expensive. In addition, the optical fingerprint sensor is separately assembled and combined with the OLED display, which has poor manufacturing convenience and the overall structure is quite complex.

Contents of the invention

An object of the present invention is to provide a fingerprint identification device that can reduce costs.

Another object of the present invention is to provide a fingerprint identification device that can reduce interference.

Another object of the present invention is to provide a display panel that can be integrally formed on a fingerprint identification device, so as to effectively achieve a fingerprint identification device with a simple structure and good manufacturing convenience.

To achieve the above object, the present invention provides a fingerprint identification device, which includes a thin film transistor substrate, a plurality of fingerprint thin film transistor switches, a plurality of sensing electrodes, a plurality of signal lines and a plurality of data lines. The thin film transistor substrate has A first side and a second side. The plurality of fingerprint thin film transistor switches are provided on the first side. Each fingerprint thin film transistor switch is provided with a gate terminal, a source terminal and a drain terminal. Each of the two fingerprint thin film transistor switches is provided with a gate terminal, a source terminal and a drain terminal. The sensing electrode corresponds to the at least two fingerprint thin film transistor switches, and a first sensing electrode in each of the two sensing electrodes is electrically connected to a first fingerprint thin film transistor switch in the at least two fingerprint thin film transistor switches. The drain terminal, a second sensing electrode in each of the two sensing electrodes is electrically connected to a ground terminal, and the drain terminal of a second fingerprint thin film transistor switch in the at least two fingerprint thin film transistor switches is connected to the third The source terminal of a fingerprint thin film transistor switch is electrically connected, each signal line is electrically connected to the gate terminals of the first and second fingerprint thin film transistor switches corresponding to the at least two transistor switching elements, and the Each data line is electrically connected to the source terminal corresponding to the second fingerprint thin film transistor switch among the at least two fingerprint thin film transistor switches; through the design of the fingerprint identification device of the present invention, the cost and structure can be effectively reduced. Simple and easy to manufacture.

Further, the plurality of sensing electrodes are disposed above the plurality of fingerprint thin film transistor switches, and the first sensing electrode in each of the two sensing electrodes is disposed above the corresponding at least two fingerprint thin film transistor switches and with each other. A first insulating film is disposed between them. The second sensing electrode in each two sensing electrodes is located above the corresponding first sensing electrode and a second insulating film is disposed between each other. One side of a protective film is connected to the opposite side. One side of the second sensing electrode of every two sensing electrodes should be attached to each other, and the protective film should be located above the second sensing electrode.

Further, the plurality of sensing electrodes and the plurality of fingerprint thin film transistor switches are disposed correspondingly on the first side of the thin film transistor substrate, and each two sensing electrodes are respectively located corresponding to the at least two fingerprint thin film transistors. One side of the switch and one side of a protective film are attached to the side corresponding to the plurality of fingerprint thin film transistors and the plurality of sensing electrodes.

Further, the plurality of sensing electrodes are disposed above the corresponding plurality of fingerprint thin film transistor switches, and each two sensing electrodes are disposed above the corresponding at least two fingerprint thin film transistor switches and are provided with a first insulation between them. film, each two sensing electrodes are arranged on the first insulating film corresponding to the at least two fingerprint thin film transistor switches, and one side of a protective film is attached to the side corresponding to each two sensing electrodes.

Further, a color filter substrate, a plurality of upper electrodes, a liquid crystal layer, a plurality of lower electrodes and a thin film transistor array substrate are sequentially stacked on the other side of the protective film to form a fingerprint recognition device. display panel.

Further, a color filter substrate, a plurality of upper electrodes, a liquid crystal layer, a plurality of lower electrodes and a thin film transistor array substrate are sequentially stacked on the second side of the thin film transistor substrate to form an integrated device. Fingerprint recognition display panel.

Further, a glass substrate, a plurality of second electrodes, an organic light-emitting layer, a plurality of first electrodes and a thin film transistor array substrate are sequentially stacked on the other side of the protective film to form a fingerprint recognition device. display panel.

Further, a glass substrate, a plurality of second electrodes, an organic light-emitting layer, a plurality of first electrodes and a thin film transistor array substrate are sequentially stacked on the second side of the thin film transistor substrate to integrally form a fingerprint. Identified display panel.

Further, the plurality of signal lines and the plurality of data lines are electrically connected to a controller respectively.

Further, the plurality of signal lines and the plurality of data lines are electrically connected to one side of at least one selector, and the other side of the at least one selector is electrically connected to a controller.

Further, the plurality of fingerprint thin film transistor switches are an amorphous silicon thin film transistor or a low temperature polycrystalline silicon thin film transistor.

Further, the thin film transistor substrate is a polymer film substrate, a glass substrate, a ceramic substrate or a metal substrate.

Description of drawings

Figure 1 is an exploded schematic diagram of a fingerprint identification device according to the first embodiment of the present invention.

FIG. 2 is a schematic diagram of the assembly of the fingerprint identification device according to the first embodiment of the present invention.

FIG. 3A is a schematic diagram of the assembly of a fingerprint identification device in an alternative embodiment of the first embodiment of the present invention.

FIG. 3B is a schematic diagram of the combination of the fingerprint identification device in another alternative embodiment of the first embodiment of the present invention.

FIG. 4A is a schematic equivalent circuit diagram of the fingerprint identification device according to the first embodiment of the present invention.

FIG. 4B is a schematic equivalent circuit diagram of a fingerprint identification device according to the first embodiment of the present invention.

FIG. 5A is a schematic diagram of a user's finger touching the fingerprint recognition device according to the first embodiment of the present invention.

FIG. 5B is a schematic diagram of another implementation mode in which the user's finger touches the fingerprint recognition device according to the first embodiment of the present invention.

FIG. 5C is a schematic diagram of the user's finger touching the fingerprint recognition device according to the first embodiment of the present invention.

FIG. 6A is a schematic diagram of the combination of the fingerprint identification device and the display panel integrally formed according to the second embodiment of the present invention.

6B is a schematic diagram of a combination of a fingerprint recognition device and a display panel integrally formed in an alternative embodiment of the second embodiment of the present invention.

7A is a schematic diagram of a combination of a fingerprint recognition device and a display panel integrally formed in another alternative embodiment of the second embodiment of the present invention.

7B is a schematic diagram of the combination of a fingerprint recognition device and a display panel integrally formed in another alternative embodiment of the second embodiment of the present invention.

FIG. 8 is a schematic diagram showing the operation of the fingerprint recognition device when the user's finger touches the display panel according to the second embodiment of the present invention.

Explanation of reference signs

Fingerprint recognition device…2

Fingerprint recognition sensing element…20

Thin film transistor substrate…21

Side 1…211

Second side…212

Fingerprint thin film transistor switch…22

The first fingerprint thin film transistor switch…221

Second fingerprint thin film transistor switch…222

Gate end...223

Source Extreme…224

Draw extremes…225

Sensing electrode…23

The first sensing electrode…231

Second sensing electrode…232

Signal line…24

Data line…25

First insulating film…26

Second insulating film…27

Protective film…28

Ground terminal…29

Display panel…3, 4

Thin film transistor array substrate…31, 41

Upper electrode…32

Liquid crystal layer…33

Lower electrode…34

Color filter substrate…35

First electrode…42

Second electrode…44

Organic light-emitting layer…43

Glass substrate…45

Display area…37, 47

Non-display area…38, 48

Controller…5

Selector…51

Selector…7

Electrostatic capacitance…CS

Capacitor…C1

Users…8

Fingers…81.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Those skilled in the art can do so without departing from the connotation of the present invention. Similar generalizations are made, and therefore the present invention is not limited to the specific embodiments disclosed below.

The above objects and structural and functional characteristics of the present invention will be explained based on the preferred embodiments of the accompanying drawings.

The present invention provides a fingerprint identification device. Please refer to Fig. 1 which is an exploded schematic diagram of the fingerprint identification device according to the first embodiment of the present invention; Fig. 2 is an assembled schematic diagram of the fingerprint identification device according to the first embodiment of the present invention; Fig. 3A is A schematic diagram of the assembly of a fingerprint identification device in an alternative embodiment of the first embodiment of the present invention; FIG. 3B is a schematic diagram of the assembly of a fingerprint identification device in another alternative embodiment of the first embodiment of the present invention; FIG. 4A is a schematic diagram of the present invention. An equivalent circuit schematic diagram of the fingerprint identification device according to the first embodiment of the invention; Figure 5A is a schematic diagram of a user's finger touching the fingerprint identification device according to the first embodiment of the invention; Figure 5B is a schematic diagram of the first embodiment of the invention. A schematic diagram of another embodiment in which a user's finger touches a fingerprint recognition device according to an embodiment. As shown in Figure 1, Figure 2, and Figure 4A, the fingerprint identification device 2 can be applied to an electronic device (not shown in the figure) or a display device (not shown in the figure). The electronic device can be a mobile phone or a notebook computer. , industrial computer, server or any form of electronic device, or the display device can be a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display, but the invention is not limited thereto.

The fingerprint identification device 2 includes a thin film transistor substrate 21, a plurality of fingerprint thin film transistor switches 22, a plurality of sensing electrodes 23, a plurality of signal lines 24 and a plurality of data lines 25. The thin film transistor substrate 21 in this embodiment Shown as a glass substrate, the thin film transistor substrate 21 is provided with a first side 211 and a second side 212. The plurality of fingerprint thin film transistor (TFT) switches are an amorphous silicon (amorphous silicon) thin film transistor (a- Si TFT) or a low temperature polycrystalline silicon thin film transistor (LTPS-TFT), the plurality of fingerprint thin film transistors are disposed on the first side 211 of the thin film transistor substrate 21, and each fingerprint thin film transistor switch is provided with a gate terminal 223 , a source terminal 224 and a sink terminal 225 . In one embodiment, the thin film transistor substrate 21 is a polymer film substrate (such as a silicone film substrate), a ceramic substrate or a metal substrate.

In this embodiment, the plurality of sensing electrodes 23 is represented as a transparent sensing electrode. The plurality of sensing electrodes 23 are formed of a transparent conductive material. The transparent conductive material is selected from one of the following groups: indium tin oxide ,ITO), indium zinc oxide (IZO), cadmium tin oxide (CTO), aluminum zinc oxide (AZO), indium tin zinc oxide (ITZO), Zinc oxide (zincoxide), cadmium oxide (cadmium oxide), hafnium oxide (HfO), indium gallium zinc oxide (InGaZnO), indium gallium zinc magnesium oxide (InGaZnMgO), oxide Indium gallium magnesium oxide (InGaMgO) or indium gallium aluminum oxide (InGaAlO)), conductive polymers, carbon nanotubes, etc. The plurality of sensing electrodes 23 are disposed above the corresponding plurality of fingerprint thin film transistor switches 22, and each two sensing electrodes 23 correspond to the at least two fingerprint thin film transistor switches 22. In this embodiment, they are represented as two sensing electrodes. 23 corresponds to two fingerprint thin film transistor switches 22 and is a set of fingerprint recognition sensing elements 20. As shown in FIG. 5C, multiple sets of fingerprint recognition sensing elements 20 are provided on the first side 211 of the thin film transistor substrate 21. During specific implementation, it is also possible to design two sensing electrodes corresponding to at least two or more (such as three or five) fingerprint thin film transistor switches to form a set of fingerprint recognition sensing elements 20 .

Each signal line 24 is electrically connected to the gate terminal 223 of the first fingerprint thin film transistor switch 221 and the second fingerprint thin film transistor switch 222 corresponding to the at least two transistor switch components. Each data line 25 is electrically connected to the source terminal 224 corresponding to the second fingerprint thin film transistor switch 222 among the at least two fingerprint thin film transistor switches 22. That is, as shown in FIG. 4A, each signal line 24 of this embodiment is along the first direction. (in the direction The data line 25 is electrically connected together with the source terminal 224 of the second fingerprint thin film transistor switch 222 corresponding to each row of the plurality of sets of fingerprint recognition sensing elements 20 along the second direction (the Y direction in the figure). And the plurality of signal lines 24 and the plurality of data lines 25 are electrically connected to a controller 5 respectively. The controller 5 is a microcontroller 5 (MCU), a processor, a single chip or a digital signal processing (DSP), the controller 5 of this embodiment is disposed on the first side 211 of the thin film transistor substrate 21, but is not limited to this. In specific implementation, the controller 5 can pass a signal line 24 ( Such as flexible signal cables) are electrically connected to the corresponding plurality of signal lines 24 and the plurality of signal lines 24, or are shared with the controller 5 on a display panel (not shown in the figure).

In one embodiment, referring to FIG. 4B , the plurality of signal lines 24 and the plurality of data lines 25 are respectively electrically connected to one side of at least one selector 51 (such as a multiplexer, MUX; data selector). In an embodiment, The selector 51 is a selector indicating 2 to 1. But it is not limited to this. In other embodiments, the selector can also be selected as a 3-to-1 selector or a 4-to-1 selector, and so on; and the other side of the selector 51 is electrically connected to the The controller 5 uses the selector 51 to connect the plurality of signal lines 24 and the plurality of data lines 25 to the controller 5. The number of lines connected to the controller 5 is greatly reduced, and the controller 5 can also have extra pins for other controls. In addition to use, a single specification or model of the controller 5 can also be applied to fingerprint identification devices 2 of different sizes, thereby eliminating the need for replacement and saving costs. In another embodiment, a plurality of signal lines 24 are electrically connected to the controller 5 , one side of the selector 51 is electrically connected to a plurality of data lines 25 , and the other side of the selector 52 is electrically connected to the controller 5 .

For convenience of description, a single set of fingerprint recognition sensing elements 20 is used as an illustration below:

A first sensing electrode 231 in every two sensing electrodes 23 is electrically connected to the drain terminal 225 corresponding to a first fingerprint thin film transistor switch 221 in the at least two fingerprint thin film transistor switches 22 . A second sensing electrode 232 in 23 is electrically connected to a ground terminal 29, and the drain terminal 225 of a second fingerprint thin film transistor switch 222 in the at least two fingerprint thin film transistor switches 22 is connected to the first fingerprint thin film transistor. The source terminal 224 of the switch 221 is electrically connected, and the first sensing electrode 231 of each two sensing electrodes 23 is an X-direction sensing electrode located above the corresponding at least two fingerprint thin film transistor switches 22, and each two A first insulating film 26 is disposed between the first sensing electrode 231 of the sensing electrodes 23 and the two corresponding fingerprint thin film transistor switches 23. The second sensing electrode 232 of each two sensing electrodes 23 is as Y The direction sensing electrode is located above the corresponding first sensing electrode 231, and a second insulating film 27 is disposed between the first sensing electrode 231 and the second sensing electrode 232. One side of a protective film 28 is connected with each other corresponding to each other. One side of the second sensing electrode 232 of the sensing electrodes 23 is attached to each other, and the protective film 28 is located above the second sensing electrode 232. The first insulating film 26, the second insulating film 27 and the protective film 28 are Materials include silicon oxide (SiOx), titanium oxide (TiOx), niobium oxide (NbOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), aluminum oxide (AlOx), aluminum oxynitride (AlOxNy), magnesium difluoride (MgF2) and tantalum oxide (TaOx)) or any suitable transparent organic material. And during specific implementation, the first insulating film 26 is respectively provided with a through hole (not shown in the figure) for power supply connection corresponding to the first sensing electrode 231 and the two fingerprint thin film transistor switches 23, so that The first sensing electrode 231 is electrically connected to the two corresponding fingerprint thin film transistor switches 22 through the through hole. The second insulating film 27 has a hole corresponding to the first sensing electrode 231 and the second sensing electrode 232 respectively. Another through hole (not shown in the figure) for power supply connection allows the second sensing electrode 232 to be electrically connected to the corresponding first sensing electrode 231 through the other through hole. In one embodiment, the protective film 28 can also be made of glass material.

In addition, refer to FIG. 5A, FIG. 5B, FIG. 5C, and supplementary reference to FIG. 4A; as shown in the figure, when the second side 212 of the thin film transistor substrate 21 is touched by the finger of a user 8, the corresponding An electrostatic capacitance CS exists between the first sensing electrodes 231 of the two sensing electrodes 23 , and a capacitance C1 is also formed between each two sensing electrodes 23 . Therefore, when the fingerprint identification device 2 does not perform fingerprint identification, the gate terminals 223 of the first fingerprint identification transistor switch 221 and the second fingerprint identification transistor switch 222 in the fingerprint identification sensing element 20 receive the controller through the corresponding signal lines 24 When a driving signal transmitted by 5 is a high voltage signal, after the first fingerprint recognition transistor switch 221 and the second fingerprint recognition transistor switch 222 are turned on (or opened), the data voltage of the data line 25 The capacitor C1 is charged to saturation. When the driving signal is a low voltage signal, the first fingerprint recognition transistor switch 221 and the second fingerprint recognition transistor switch 222 are not conducting (or are turned off). At this time, the data line 25 is in a floating state. If a finger 81 of the user 8 touches the second side 212 (or the other side of the protective film 28 ) of the thin film transistor substrate 21 of the fingerprint identification device 2 for fingerprint identification, the driving signal is a high voltage signal. After the first fingerprint recognition transistor switch 221 and the second fingerprint recognition transistor switch 222 are turned on, the data voltage of the data line 25 is charged to the electrostatic capacitor CS and the capacitor C1 to saturation, and then the driving signal reaches a low voltage. When the signal is generated, the first fingerprint recognition transistor switch 221 and the second fingerprint recognition transistor switch 222 are not conductive (or are turned off), and the data line 25 is in a floating state, waiting for the next driving signal. When the first fingerprint recognition transistor switch 221 and the second fingerprint recognition transistor switch 222 are turned on again for a high voltage signal, the electrostatic capacitance CS and the capacitor C1 are discharged. At this time, the controller 5 can pass the corresponding data line 25 A fingerprint recognition image (such as a finger fingerprint image) is obtained by changing the data voltage on the sensor. In an alternative embodiment, referring to FIGS. 3A and 5C , the plurality of sensing electrodes 23 and the plurality of fingerprint thin film transistor switches 22 are disposed correspondingly on the first side 211 of the thin film transistor substrate 21 , and each group of fingerprint recognition Each two sensing electrodes 23 of the sensing element 20 are respectively located on the side corresponding to the at least two fingerprint thin film transistor switches 22 and are parallel to each other. One side of the plurality of sensing electrodes 23 is attached to each other.

In another alternative embodiment, referring to FIG. 3B and FIG. 5C , every two sensing electrodes 23 of each group of fingerprint recognition sensing elements 20 are located above the corresponding at least two fingerprint thin film transistor switches 22 , and every two sensing electrodes The first insulating film 26 is disposed between 23 and the corresponding at least two fingerprint thin film transistor switches 22. The first sensing electrode 231 and the second sensing electrode 232 of each two sensing electrodes 23 are arranged in parallel at the corresponding at least On one side of the first insulating film 26 of the two fingerprint thin film transistor switches 22, one side of the protective film 28 is attached to the side corresponding to each of the two sensing electrodes 23.

Therefore, through the design of the fingerprint identification device 2 of the present invention, the cost can be effectively reduced, the structure is simple, and the manufacturing convenience is improved.

Please refer to FIG. 6A , which is a schematic diagram of a combination of a fingerprint identification device and a display panel integrally formed in a second embodiment of the present invention; FIG. 6B is a schematic view of a fingerprint identification device integrally formed with a display panel in an alternative embodiment of the second embodiment of the present invention. FIG. 7A is a schematic diagram of the combination of the fingerprint recognition device and the display panel integrally formed in another alternative embodiment of the second embodiment of the present invention; FIG. 7B is a schematic view of the second embodiment of the present invention in another alternative implementation. A schematic diagram of the combination of the fingerprint identification device and the display panel integrally formed in the example; FIG. 8 is a schematic diagram of the operation of the fingerprint identification device when the user's finger touches the display panel according to the second embodiment of the present invention. Refer to FIG. 1. Figure 4A. This embodiment mainly applies the fingerprint identification device 2 of the first embodiment to a display panel 3 and manufactures the display panel 3 with fingerprint identification in an integrated manner, that is, the protective film 28 of the fingerprint identification device 2 On the other side, a color filter substrate 35 (Color Filter Substrate), a plurality of upper electrodes 32 (such as ITO), a liquid crystal layer 33 (LiquidCrystal Layer), a plurality of lower electrodes 34 (such as ITO) and A thin film transistor array substrate 31 (TFT ArraySubstrate) is used to integrally form the aforementioned display panel 3 with fingerprint recognition (such as a liquid crystal display panel; LCD panel), and the fingerprint recognition device 2 of this embodiment is disposed on a side of the display panel 3 The display area 37 , the plurality of signal lines 24 and the plurality of data lines 25 and the controller 5 are arranged in a non-display area 38 of the display panel 3 , so the finger 81 of the user 8 can directly touch the corresponding display of the display panel 3 Fingerprint recognition is performed on the second side 212 of the thin film transistor substrate 21 in the area 37 . In particular, the area of the fingerprint identification device 1 may be equal to or smaller than the area of the display panel 3 .

In an alternative embodiment, referring to FIG. 6B , the aforementioned color filter substrate 35 , a plurality of upper electrodes 32 , a liquid crystal layer 33 , a plurality of lower electrodes 34 and thin films are sequentially stacked on the second side 212 of the fingerprint recognition device 2 The transistor array substrate 31 integrally forms the aforementioned display panel 3 (such as a liquid crystal display panel) with fingerprint recognition, allowing the user 8 to directly touch the other side of the protective film 28 on the display area 37 corresponding to the display panel 3 Perform fingerprint recognition on the screen.

In another alternative embodiment, referring to FIG. 7A, a glass substrate 45, a plurality of second electrodes 44 (such as ITO), an organic light-emitting layer 43, and a plurality of first electrodes are sequentially stacked on the other side of the protective film 28. 42 (such as ITO) and a thin film transistor array substrate 41 (TFT Array Substrate) are integrated to form a fingerprint recognition display panel 4 (such as an organic light-emitting display panel; OLED panel), so the finger 81 of the user 8 can directly Touch the second side 212 of the thin film transistor substrate 21 corresponding to the display area 47 of the display panel 4 to perform fingerprint recognition, and a plurality of signal lines 24, a plurality of data lines 25 and the controller 5 are provided on the display panel 4 The non-display area 48, and in this other embodiment, the first electrode 42 is an anode electrode and is an opaque indium tin oxide (indium-tin-oxide; ITO) electrode, and the second electrode 44 is a cathode electrode and is Transparent or translucent electrodes (such as ITO).

In another alternative embodiment, referring to FIG. 7B , the glass substrate 45 , a plurality of second electrodes 44 (such as ITO), an organic light-emitting layer 43 , and a plurality of organic light emitting layers are sequentially stacked on the second side 212 of the thin film transistor substrate 21 . A first electrode 42 (such as ITO) and a thin film transistor array substrate 41 are integrated to form a fingerprint recognition display panel 4 (such as an OLED panel), so that the user 8 can directly touch the display area corresponding to the display panel 4 47 on the other side of the protective film 28 for fingerprint recognition.

Therefore, through the integrated design of the fingerprint identification device 2 and the display panels 3 and 4 of the present invention, the finger 81 of the user 8 can directly touch the fingerprint identification device 2 itself to perform fingerprint identification, thereby effectively improving the accuracy of fingerprint identification. Recognition speed and interference reduction, and also effectively achieves good manufacturing convenience, simple structure and reduced cost.

Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims (9)

1. A fingerprint identification device, comprising:

a thin film transistor substrate having a first side and a second side;

a plurality of fingerprint thin film transistor switches arranged on the first side, each fingerprint thin film transistor switch having a gate terminal, a source terminal and a drain terminal;

the sensing electrodes are respectively corresponding to at least two fingerprint thin film transistor switches, a first sensing electrode in each sensing electrode is electrically connected with the drain end of a first fingerprint thin film transistor switch in the at least two fingerprint thin film transistor switches, a second sensing electrode in each sensing electrode is electrically connected with a grounding end, and the drain end of a second fingerprint thin film transistor switch in the at least two fingerprint thin film transistor switches is electrically connected with the source end of the first fingerprint thin film transistor switch; the plurality of sensing electrodes are arranged above the plurality of fingerprint thin film transistor switches, the first sensing electrode of each two sensing electrodes is arranged above the fingerprint thin film transistor switches, a first insulating film is arranged between the first sensing electrode and the second sensing electrode of each two sensing electrodes, a second insulating film is arranged between the second sensing electrode and the first sensing electrode, one side of a protective film is attached to one side of the second sensing electrode of each two sensing electrodes, and the protective film is arranged above the second sensing electrode;

a plurality of signal lines, each of which is electrically connected with the gate terminals of the first fingerprint thin film transistor switch and the second fingerprint thin film transistor switch corresponding to the at least two fingerprint thin film transistor switches; and

And a plurality of data lines, each of the data lines being electrically connected to the source terminal of the second fingerprint thin film transistor switch of the at least two fingerprint thin film transistor switches.

2. The fingerprint identification apparatus of claim 1, wherein a color filter substrate, a plurality of upper electrodes, a liquid crystal layer, a plurality of lower electrodes and a thin film transistor array substrate are sequentially laminated on the other side of the protective film to integrally form a display panel with fingerprint identification.

3. The fingerprint recognition device according to claim 1, wherein a color filter substrate, a plurality of upper electrodes, a liquid crystal layer, a plurality of lower electrodes and a thin film transistor array substrate are sequentially laminated on the second side of the thin film transistor substrate to integrally form a display panel with fingerprint recognition.

4. The fingerprint identification apparatus of claim 1, wherein a glass substrate, a plurality of second electrodes, an organic light emitting layer, a plurality of first electrodes and a thin film transistor array substrate are sequentially laminated on the other side of the protective film to integrally form a display panel with fingerprint identification.

5. The fingerprint recognition device according to claim 1, wherein the glass substrate, the plurality of second electrodes, the organic light emitting layer, the plurality of first electrodes and a thin film transistor array substrate are sequentially stacked on the second side of the thin film transistor substrate to integrally form a display panel with fingerprint recognition.

6. The fingerprint identification device according to claim 1, wherein the plurality of signal lines and the plurality of data lines are electrically connected to a controller, respectively.

7. The fingerprint identification device of claim 1, wherein the plurality of signal lines and the plurality of data lines are electrically connected to one side of at least one selector, respectively, and the other side of the at least one selector is electrically connected to a controller.

8. The fingerprint identification device of claim 1, wherein the plurality of fingerprint thin film transistor switches are an amorphous silicon thin film transistor or a low temperature polysilicon thin film transistor.

9. The fingerprint recognition device according to claim 1, wherein the thin film transistor substrate is a polymer thin film substrate, a glass substrate, a ceramic substrate or a metal substrate.