CN110688899A - Fingerprint identification device - Google Patents

Fingerprint identification device Download PDF

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Publication number
CN110688899A
CN110688899A CN201910789892.0A CN201910789892A CN110688899A CN 110688899 A CN110688899 A CN 110688899A CN 201910789892 A CN201910789892 A CN 201910789892A CN 110688899 A CN110688899 A CN 110688899A
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China
Prior art keywords
thin film
fingerprint
film transistor
electrodes
substrate
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Granted
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CN201910789892.0A
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Chinese (zh)
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CN110688899B (en
Inventor
林韦丞
萧建仁
邱伯韦
江立达
曾士修
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Key Hexin Science And Technology Co Ltd
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Key Hexin Science And Technology Co Ltd
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Publication of CN110688899A publication Critical patent/CN110688899A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens

Abstract

The invention relates to a fingerprint identification device, which comprises a thin film transistor substrate with a first side and a second side, a plurality of fingerprint thin film transistor switches, a plurality of induction electrodes, a plurality of signal lines and a plurality of data lines, wherein the fingerprint thin film transistor switches are arranged on the first side; cost reduction can be achieved by this design.

Description

Fingerprint identification device
Technical Field
The present invention relates to a fingerprint identification device, and more particularly, to a fingerprint identification device with reduced cost.
Background
Fingerprint identification modules are becoming one of the standard equipment of electronic devices, so that users can identify their identities through the fingerprint identification modules to unlock the electronic devices or to operate application programs.
In order to make users more convenient to use electronic devices, it has become a trend to simplify the input operations on electronic devices, and therefore touch input modules are gradually replacing keyboard input modules. In some electronic devices, for example: the smart phone (smartphone) has a display module with touch input function to completely replace the key input. The electronic device is generally provided with the fingerprint identification module below the display module without keys, so that a user can place a finger in the display area of the display module to identify the fingerprint.
In the prior art, as in U.S. patent publication No. US2018239941a1, it relates to a semiconductor fingerprint sensor (i.e., an optical fingerprint sensor) mounted under a display. In its description, an under-display optical fingerprint sensor arrangement for mitigating moire effect is presented, the electronic device comprising: a display (e.g., an OLED display) comprising rows of primitive elements that are parallel to a first major direction along a first axis; and an optical sensor installed below the display to sense fingerprint imaging by receiving a light source reflected from a user's finger fingerprint through the optical sensor.
However, another problem is that the optical fingerprint sensor is installed below the display panel, so that the optical fingerprint sensor must project light generated by the light emitting diodes RGB in the OLED display above to the finger fingerprint touching the upper surface of the OLED display above, and then wait for the light to be reflected from the finger fingerprint, and then the optical fingerprint sensor can sense the fingerprint image, so that the whole light source path is long and complicated in the process of obtaining the fingerprint image, and further, the light source is easily interfered by other internal or external factors (such as the interference of the OLED display internal structure or the interference of external light), and the finger of the user directly touches the OLED display panel instead of directly touching the optical fingerprint sensor, which results in poor recognition accuracy and increased recognition time, and the whole price is quite expensive. In addition, the optical fingerprint sensor is additionally assembled under the OLED display, and is not easy to manufacture and the entire structure is rather complicated.
Disclosure of Invention
An object of the present invention is to provide a fingerprint identification device capable of reducing the cost.
Another object of the present invention is to provide a fingerprint identification device with reduced interference.
Another objective of the present invention is to provide a fingerprint identification device with a display panel integrally formed on the fingerprint identification device, so as to effectively achieve a simple structure and a convenient manufacturing.
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, wherein the thin film transistor substrate has a first side and a second side, the plurality of fingerprint thin film transistor switches are disposed on the first side, each fingerprint thin film transistor switch has a gate terminal, a source terminal and a drain terminal, each two sensing electrodes correspond to at least two fingerprint thin film transistor switches, a first sensing electrode of each two sensing electrodes is electrically connected to the drain terminal of a first fingerprint thin film transistor switch of the at least two fingerprint thin film transistor switches, a second sensing electrode of each two sensing electrodes is electrically connected to a ground terminal, the drain terminal of a second fingerprint thin film transistor switch of the at least two fingerprint thin film transistor switches and the source terminal of the first fingerprint thin film transistor switch Each signal line is electrically connected with the gate terminals of the first and second fingerprint thin film transistor switches corresponding to the at least two transistor switches, and each data line is electrically connected with the source terminal of the second fingerprint thin film transistor switch corresponding to the at least two fingerprint thin film transistor switches; the fingerprint identification device of the invention has the advantages of effectively reducing cost, simple structure and good manufacturing convenience.
Furthermore, 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 at least two fingerprint thin film transistor switches, a first insulating film is arranged between the first sensing electrodes, the second sensing electrode of each two sensing electrodes is arranged above the first sensing electrode, a second insulating film is arranged between the second sensing electrodes, 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.
Furthermore, the plurality of sensing electrodes and the plurality of fingerprint thin film transistor switches are correspondingly arranged on the first side of the thin film transistor substrate, every two sensing electrodes are respectively arranged on one side corresponding to the at least two fingerprint thin film transistor switches, and one side of a protection film is attached to one side corresponding to the plurality of fingerprint thin film transistors and the plurality of sensing electrodes.
Furthermore, the plurality of sensing electrodes are arranged above the plurality of fingerprint thin film transistor switches, every two sensing electrodes are arranged above the at least two fingerprint thin film transistor switches, a first insulating film is arranged between every two sensing electrodes, every 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 one side corresponding to every two sensing electrodes.
Furthermore, 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, so that a display panel with fingerprint identification is integrally formed.
Furthermore, 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 a display panel with fingerprint identification.
Furthermore, 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, so that a display panel with fingerprint identification is integrally formed.
Furthermore, 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 form a display panel with fingerprint identification.
Furthermore, the signal lines and the data lines are respectively electrically connected to a controller.
Furthermore, the signal lines and the data lines are respectively 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.
Furthermore, the fingerprint thin film transistor switches are amorphous silicon thin film transistors or low temperature polysilicon thin film transistors.
Furthermore, the thin film transistor substrate is a polymer thin film substrate, a glass substrate, a ceramic substrate or a metal substrate.
Drawings
FIG. 1 is an exploded view of a fingerprint identification device according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram of a fingerprint identification device according to a first embodiment of the present invention.
FIG. 3A is a schematic diagram of a fingerprint identification device according to an alternative embodiment of the present invention.
FIG. 3B is a schematic diagram of a fingerprint identification device according to another alternative embodiment of the present invention.
FIG. 4A is a schematic equivalent circuit diagram of a fingerprint identification device according to a first embodiment of the invention.
FIG. 4B is a schematic equivalent circuit diagram of a fingerprint identification device according to a first embodiment of the invention.
FIG. 5A is a diagram illustrating an embodiment of a user's finger touching a fingerprint identification device according to a first embodiment of the invention.
FIG. 5B is a diagram illustrating another embodiment of the first embodiment of the present invention, in which a finger of a user touches a fingerprint identification device.
FIG. 5C is a diagram illustrating a user's finger touching the fingerprint identification device according to the first embodiment of the present invention.
FIG. 6A is a schematic view of a fingerprint identification device and a display panel integrally formed according to a second embodiment of the present invention.
FIG. 6B is a schematic view of an alternative embodiment of a fingerprint identification device and a display panel integrally formed according to a second embodiment of the present invention.
FIG. 7A is a schematic view of a fingerprint identification device and a display panel integrally formed according to another alternative embodiment of the present invention.
FIG. 7B is a schematic diagram of a fingerprint identification device and a display panel integrally formed according to another alternative embodiment of the present invention.
FIG. 8 is a schematic diagram illustrating a finger of a user touching the fingerprint identification device on the display panel according to the second embodiment of the present invention.
Description of the reference numerals
Fingerprint recognition device … 2
Fingerprint sensing element … 20
Thin film transistor substrate … 21
First side … 211
Second side … 212
Fingerprint thin film transistor switch … 22
First fingerprint thin film transistor switch … 221
Second fingerprint thin film transistor switch … 222
Gate terminal … 223
Source terminal … 224
Drain terminal … 225
Sensing electrode … 23
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 panels … 3, 4
Thin film transistor array substrates … 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 areas … 37, 47
Non-display areas … 38, 48
Controller … 5
Selector … 51
Selector … 7
Electrostatic capacitance … CS
Capacitor … C1
User … 8
Finger … 81.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
The above objects, together with the structural and functional features thereof, are accomplished by the preferred embodiments according to the accompanying drawings.
Fig. 1 is an exploded view of a fingerprint identification device according to a first embodiment of the present invention; FIG. 2 is a schematic diagram of a fingerprint identification device according to a first embodiment of the present invention; FIG. 3A is a schematic diagram of a fingerprint identification device according to an alternative embodiment of the present invention; FIG. 3B is a schematic diagram of a fingerprint identification device according to another alternative embodiment of the present invention; FIG. 4A is a schematic equivalent circuit diagram of a fingerprint identification device according to a first embodiment of the present invention; FIG. 5A is a diagram illustrating an embodiment of a user's finger touching a fingerprint recognition device according to a first embodiment of the present invention; FIG. 5B is a diagram illustrating another embodiment of the first embodiment of the present invention, in which a finger of a user touches a fingerprint identification device. As shown in fig. 1, fig. 2, and fig. 4A, the fingerprint recognition device 2 can be applied to an electronic device (not shown) or a display device (not shown), wherein the electronic device can be a mobile phone, a notebook computer, an industrial computer, a server, or any type 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 is represented as a glass substrate in this embodiment, the thin film transistor substrate 21 has a first side 211 and a second side 212, the fingerprint Thin Film Transistor (TFT) switches are amorphous silicon (a-Si) TFTs or low temperature polysilicon (LTPS-TFT) TFTs, the 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 has a gate terminal 223, a source terminal 224 and a drain terminal 225. In one embodiment, the thin film transistor substrate 21 is a polymer film substrate (e.g., a silicon film substrate), a ceramic substrate or a metal substrate.
The sensing electrodes 23 are shown as a transparent sensing electrode in this embodiment, the sensing electrodes 23 are formed of a transparent conductive material selected from one of Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Cadmium Tin Oxide (CTO), Aluminum Zinc Oxide (AZO), indium zinc tin oxide (ITO), zinc oxide (ITZO), zinc oxide (IZO), cadmium oxide (cadmia oxide), hafnium oxide (HfO), indium gallium zinc oxide (ingalga), indium gallium zinc oxide (ingaas), indium gallium magnesium oxide (ingaas), or indium gallium oxide (ingaas), or a carbon nanotube, or a carbon nanotube. The sensing electrodes 23 are disposed above the fingerprint thin film transistor switches 22, and each of the two sensing electrodes 23 corresponding to the at least two fingerprint thin film transistor switches 22 is represented in this embodiment as two sensing electrodes 23 corresponding to two fingerprint thin film transistor switches 22 as a group of fingerprint identification sensing elements 20, as shown in fig. 5C, a plurality of groups of fingerprint identification sensing elements 20 are disposed on the first side 211 of the thin film transistor substrate 21. In the implementation, two sensing electrodes corresponding to at least two (e.g., three or five) fingerprint thin film transistor switches may be designed as a set of fingerprint sensing device 20.
Each signal line 24 is electrically connected to the gate terminal 223 of the first fingerprint TFT switch 221 and the second fingerprint TFT switch 222 corresponding to the at least two transistor switches, each data line 25 is electrically connected to the source terminal 224 of the second fingerprint thin film transistor switch 222 corresponding to the at least two fingerprint thin film transistor switches 22, that is, as shown in fig. 4A, each signal line 24 of the present embodiment is electrically connected to the gate terminals 223 of the first fingerprint thin film transistor switch 221 and the second fingerprint thin film transistor switch 222 corresponding to each row of the plurality of groups of fingerprint sensing devices 20 along the first direction (e.g. the X direction in the figure), each data line 25 is electrically connected to the source terminals 224 of the second fingerprint thin film transistor switches 222 of each column of the corresponding fingerprint sensor device 20 along a second direction (e.g., Y direction). The signal lines 24 and the data lines 25 are electrically connected to a controller 5, the controller 5 is a micro controller unit 5(MCU), a processor, a single chip or a Digital Signal Processor (DSP), the controller 5 of the present embodiment is disposed on the first side 211 of the tft substrate 21, but not limited thereto, and in specific implementation, the controller 5 may be electrically connected to the signal lines 24 corresponding to the signal lines 24 (such as flexible signal cables) or shared with the controller 5 on a display panel (not shown).
In one embodiment, referring to fig. 4B, the signal lines 24 and the data lines 25 are electrically connected to one side of at least one selector 51 (e.g., multiplexer, MUX; data selector), and the selector 51 in one embodiment is a 2-to-1 selector. But not limited thereto, the selector in other embodiments may be selected as a 1-out-of-3 selector or a 1-out-of-4 selector, and so on; the other side of the selector 51 is electrically connected to the controller 5, the number of lines connecting the signal lines 24 and the data lines 25 to the controller 5 through the selector 51 is greatly reduced, the controller 5 can have more pins for other controls, and the controller 5 with a single specification or model can be applied to fingerprint identification devices 2 with different sizes, so that the effects of no need of replacement and cost saving are achieved. In another embodiment, the signal lines 24 are electrically connected to the controller 5, one side of the selector 51 is electrically connected to the data lines 25, and the other side of the selector 52 is electrically connected to the controller 5.
For convenience, a single set of fingerprint sensor devices 20 is described as follows:
a first sensing electrode 231 of every two sensing electrodes 23 is electrically connected to a drain terminal 225 of a first fingerprint thin film transistor switch 221 corresponding to the at least two fingerprint thin film transistor switches 22, a second sensing electrode 232 of every two sensing electrodes 23 is electrically connected to a ground terminal 29, a drain terminal 225 of a second fingerprint thin film transistor switch 222 of the at least two fingerprint thin film transistor switches 22 is electrically connected to a source terminal 224 of the first fingerprint thin film transistor switch 221, the first sensing electrode 231 of every two sensing electrodes 23 is, for example, an X-direction sensing electrode located above the at least two fingerprint thin film transistor switches 22, a first insulation film 26 is disposed between the first sensing electrode 231 of every two sensing electrodes 23 and the corresponding two fingerprint thin film transistor switches 23, the second sensing electrode 232 of every two sensing electrodes 23 is, for example, a Y-direction sensing electrode located above the first sensing electrode 231 And a second insulating film 27 is disposed between the first and second sensing electrodes 231 and 232, one side of a protective film 28 is attached to one side of the second sensing electrode 232 corresponding to each of the two sensing electrodes 23, and the protective film 28 is disposed above the second sensing electrode 232, and the first, second and protective films 26, 27 and 28 are made of materials such as 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. In practical implementation, the first insulating film 26 is respectively provided with a through hole (not shown) corresponding to the first sensing electrode 231 and the two fingerprint thin film transistor switches 23 for electrical connection, so that the first sensing electrode 231 is electrically connected to the two fingerprint thin film transistor switches 22 through the through hole, and the second insulating film 27 is respectively provided with another through hole (not shown) corresponding to the first sensing electrode 231 and the second sensing electrode 232 for electrical connection, so that the second sensing electrode 232 is electrically connected to the first sensing electrode 231 through the another through hole. In one embodiment, the protection film 28 may also be a glass material.
In addition, refer to fig. 5A, 5B, and 5C, as well as fig. 4A; as shown, an electrostatic capacitance CS exists between the second side 212 of the thin film transistor substrate 21 and the first sensing electrode 231 corresponding to each two sensing electrodes 23 when being touched by a finger of a user 8, 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 device 20 receive a high voltage signal from the controller 5 through the corresponding signal lines 24, after the first fingerprint identification transistor switch 221 and the second fingerprint identification transistor switch 222 are turned on (or turned on), the capacitor C1 is charged to saturation by the data voltage of the data line 25, and when the driving signal is a low voltage signal, the first fingerprint identification transistor switch 221 and the second fingerprint identification transistor switch 222 are turned off (or turned off), and the data line 25 is in a floating (floating) state. When a finger 81 of a user 8 touches the second side 212 of the tft substrate 21 (or the other side of the protective film 28) of the fingerprint identification device 2 for fingerprint identification, the driving signal is a high voltage signal to turn on the first and second fingerprint identification transistor switches 221 and 222, the data voltage of the data line 25 charges the electrostatic capacitance CS and the capacitance C1 to saturation, when the driving signal is a low voltage signal, the first and second fingerprint identification transistor switches 221 and 222 are turned off (or turned off), the data line 25 is in a floating (floating) state, when the driving signal is a high voltage signal to turn on the first and second fingerprint identification transistor switches 221 and 222 again, the electrostatic capacitance CS and the capacitance C1 are discharged, and the controller 5 can obtain a fingerprint identification through the data voltage on the data line 25 corresponding to the variation Like (e.g., finger print images). In an alternative embodiment, referring to fig. 3A and 5C, the sensing electrodes 23 and the fingerprint thin film transistor switches 22 are disposed on the first side 211 of the thin film transistor substrate 21, each two sensing electrodes 23 of each fingerprint identification sensing device 20 are respectively disposed on a side corresponding to the at least two fingerprint thin film transistor switches 22 and are parallel to each other, and a side of the protection film 28 is attached to a side corresponding to the fingerprint thin film transistor switches 22 and the sensing electrodes 23.
In another alternative embodiment, referring to fig. 3B and 5C, each two sensing electrodes 23 of each fingerprint sensing device set 20 are located above the corresponding at least two fingerprint thin film transistor switches 22, the first insulating film 26 is disposed between each two sensing electrodes 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 disposed in parallel on one side of the first insulating film 26 corresponding to the at least two fingerprint thin film transistor switches 22, and one side of the protective film 28 is attached to one side of the corresponding at least two sensing electrodes 23.
Therefore, the design of the fingerprint identification device 2 of the invention can effectively achieve the purposes of reducing cost, simplifying structure and having good manufacturing convenience.
Please refer to fig. 6A, which is a diagram illustrating an integrated assembly of a fingerprint identification device and a display panel according to a second embodiment of the present invention; FIG. 6B is a schematic view of a second embodiment of the present invention illustrating an integrated fingerprint identification device and a display panel; FIG. 7A is a schematic view of a fingerprint identification device and a display panel of a second embodiment of the present invention being integrally formed; FIG. 7B is a schematic view of a fingerprint identification device and a display panel of a second embodiment of the present invention being integrally formed; fig. 8 is a schematic diagram illustrating operation of the fingerprint identification device of the second embodiment of the present invention when a user touches a finger on the display panel, with reference to fig. 1 and 4A. The fingerprint identification device 2 of the first embodiment is mainly applied to a display panel 3, and the display panel 3 with fingerprint identification is manufactured in an integrated manner, that is, a Color Filter Substrate 35(Color Filter Substrate), a plurality of upper electrodes 32 (ITO), a liquid crystal Layer 33(liquid crystal Layer), a plurality of lower electrodes 34 (ITO) and a thin film transistor array Substrate 31(TFT array Substrate) are sequentially stacked on the other side of the protective film 28 of the fingerprint identification device 2 to integrally form the display panel 3 with fingerprint identification (liquid crystal display panel; LCD panel), the fingerprint identification device 2 of the present embodiment is disposed in a display area 37 of the display panel 3, and the plurality of signal lines 24 and data lines 25 and the controller 5 are disposed in a non-display area 38 of the display panel 3, so that a finger 81 of a user 8 can directly touch a second side of the thin film transistor Substrate 21 on the display area 37 corresponding to the display panel 3 212 for fingerprint recognition. And in real time, the area of the fingerprint recognition 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 color filter substrate 35, the plurality of upper electrodes 32, the liquid crystal layer 33, the plurality of lower electrodes 34 and the thin film transistor array substrate 31 are sequentially stacked on the second side 212 of the fingerprint identification device 2 to form the display panel 3 (e.g., a liquid crystal display panel) with fingerprint identification integrally, so that the user 8 can directly touch the other side of the protection film 28 on the display area 37 corresponding to the display panel 3 for fingerprint identification.
In another alternative embodiment, referring to fig. 7A, a glass Substrate 45, a plurality of second electrodes 44 (e.g., ITO), an organic light emitting layer 43, a plurality of first electrodes 42 (e.g., ITO) and a thin film transistor Array Substrate 41(TFT Array Substrate) are sequentially stacked on the other side of the protection film 28 to form a display panel 4 (e.g., organic light emitting display panel; OLED panel) with fingerprint identification, so that a finger 81 of a user 8 can directly touch the second side 212 of the thin film transistor Substrate 21 on the display region 47 corresponding to the display panel 4 to perform fingerprint identification, and a plurality of signal lines 24, a plurality of data lines 25 and a controller 5 are disposed on the non-display region 48 of the display panel 4, and in this other embodiment, the first electrodes 42 are anode electrodes and are opaque oxide (ITO) electrodes, the second electrodes 44 are cathode electrodes, and is a transparent or translucent electrode (e.g., ITO).
In another alternative embodiment, referring to fig. 7B, the glass substrate 45, the plurality of second electrodes 44 (such as ITO), the organic light emitting layer 43, the plurality of first electrodes 42 (such as ITO), and the thin film transistor array substrate 41 are sequentially stacked on the second side 212 of the thin film transistor substrate 21 to form a display panel 4 (such as an OLED panel) with fingerprint identification, so that a user 8 can directly touch the other side of the protection film 28 on the display area 47 corresponding to the display panel 4 for fingerprint identification.
Therefore, through the design of the integrated formation and combination of the fingerprint identification device 2 and the display panels 3 and 4, the finger 81 of the user 8 directly touches the fingerprint identification device 2 to perform fingerprint identification, so as to effectively improve the fingerprint identification accuracy and speed and reduce the interference, and further effectively achieve the purposes of good manufacturing convenience, simple structure and cost reduction.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (12)

1. A fingerprint recognition device, comprising:
a thin film transistor substrate having a first side and a second side;
a plurality of fingerprint thin film transistor switches disposed on the first side, each fingerprint thin film transistor switch having a gate terminal, a source terminal and a drain terminal;
a plurality of sensing electrodes, wherein each two sensing electrodes correspond to at least two fingerprint thin film transistor switches, a first sensing electrode of each two sensing electrodes is electrically connected to the drain terminal of a first fingerprint thin film transistor switch corresponding to the at least two fingerprint thin film transistor switches, a second sensing electrode of each two sensing electrodes is electrically connected to a ground terminal, and the drain terminal of a second fingerprint thin film transistor switch of the at least two fingerprint thin film transistor switches is electrically connected to the source terminal of the first fingerprint thin film transistor switch;
a plurality of signal lines, each of which is electrically connected to the gate terminals of the first and second fingerprint thin film transistor switches corresponding to the at least two transistor switches; and
a plurality of data lines, each of the data lines being electrically connected to the source terminal of the second one of the at least two fingerprint thin film transistor switches.
2. The fingerprint identification device according to claim 1, wherein the sensing electrodes are disposed above the fingerprint thin film transistor switches, the first sensing electrode of each two sensing electrodes is disposed above the at least two fingerprint thin film transistor switches and has a first insulating film therebetween, the second sensing electrode of each two sensing electrodes is disposed above the first sensing electrode and has a second insulating film therebetween, a side of a protective film is attached to a side of the second sensing electrode of each two sensing electrodes, and the protective film is disposed above the second sensing electrode.
3. The fingerprint recognition device according to claim 1, wherein the sensing electrodes and the fingerprint thin film transistor switches are disposed on the first side of the thin film transistor substrate, each of the sensing electrodes is disposed on a side corresponding to the at least two fingerprint thin film transistor switches, and a side of a protection film is attached to a side corresponding to the fingerprint thin film transistors and the sensing electrodes.
4. The apparatus according to claim 1, wherein the sensing electrodes are disposed above the fingerprint thin film transistor switches, each two sensing electrodes are disposed above the at least two fingerprint thin film transistor switches and a first insulating film is disposed therebetween, each two sensing electrodes are disposed 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 one side of each two sensing electrodes.
5. The fingerprint identification device of claim 2, 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 stacked on the other side of the protective film to form a display panel with fingerprint identification function.
6. The apparatus according to claim 2, 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 stacked on the second side of the thin film transistor substrate to form a display panel with fingerprint recognition function.
7. The fingerprint identification device according to claim 2, 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 stacked on the other side of the protective film to form a display panel with fingerprint identification.
8. The fingerprint identification device of claim 2, 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 stacked on the second side of the thin film transistor substrate to form a display panel with fingerprint identification function.
9. The fingerprint identification device of claim 1, wherein the signal lines and the data lines are electrically connected to a controller, respectively.
10. The fingerprint identification device according to claim 1, wherein the signal lines and the 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.
11. The fingerprint recognition device according to claim 1, wherein said fingerprint thin film transistor switches are an amorphous silicon thin film transistor or a low temperature polysilicon thin film transistor.
12. The fingerprint recognition device according to claim 1, wherein the thin film transistor substrate is a polymer film substrate, a glass substrate, a ceramic substrate or a metal substrate.
CN201910789892.0A 2019-08-26 2019-08-26 Fingerprint identification device Active CN110688899B (en)

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TWI603244B (en) * 2016-09-21 2017-10-21 關鍵禾芯科技股份有限公司 Liquid crystal device with fingerprint identification function
CN108987605A (en) * 2017-06-02 2018-12-11 三星显示有限公司 Show equipment
CN209044568U (en) * 2017-12-30 2019-06-28 深圳信炜科技有限公司 Photosensitive driving circuit, photosensitive device and electronic equipment

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CN104106030A (en) * 2011-12-22 2014-10-15 纳米技术方案公司 Switched-electrode capacitive-measurement device for touch-sensitive and contactless interfaces
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