CN112163565A - Fingerprint identification circuit and OLED display panel - Google Patents
Fingerprint identification circuit and OLED display panel Download PDFInfo
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- CN112163565A CN112163565A CN202011168213.7A CN202011168213A CN112163565A CN 112163565 A CN112163565 A CN 112163565A CN 202011168213 A CN202011168213 A CN 202011168213A CN 112163565 A CN112163565 A CN 112163565A
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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
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- 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
Abstract
The invention provides a fingerprint identification circuit and an OLED display panel, wherein the fingerprint identification circuit is embedded in the OLED display panel, a movable polar plate of a capacitor unit in the fingerprint identification circuit is made of conductive elastic plastic materials, the movable polar plate can deform and approach to a fixed polar plate after the fingerprint touches or presses the movable polar plate, the movable polar plate can restore to the original state after the touch or the press disappears, the capacitor unit can change in the process of touching, pressing or releasing a finger, the source/drain current flowing through a first thin film transistor in the fingerprint identification circuit can change to cause the voltage of a second node (B) to change, the voltage of the second node (B) is further measured, the voltage of the second node (B) is converted into a digital signal, and whether the digital signal corresponding to the area pressed by the fingerprint and the pressure conversion is a standard digital signal of stored fingerprint information or not is evaluated, the fingerprint detection method is simple, easy to implement and high in sensitivity.
Description
Technical Field
The invention relates to the technical field of display, in particular to a fingerprint identification circuit and an OLED display panel.
Background
An Organic Light Emitting Diode (OLED) Display panel has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, a viewing angle of approximately 180 °, and a wide temperature range, and is widely used in smart phones, tablet computers, full-color televisions, and the like.
As shown in fig. 1, currently, the OLED display panel 102 generally includes an under-screen fingerprint identification module 101, where the fingerprint identification module 101 includes a flexible circuit board 1011, a micro optical sensor 1012 located on the flexible circuit board 1011, a collimator 1013 located on the micro optical sensor 1012, and an optical adhesive 1014 located on the collimator 1013, an infrared light source 1021 is disposed inside the OLED display panel 102, light emitted by the infrared light source 1021 passes through a cover plate layer 103 and contacts with a finger 104, the light is reflected on the surface of the finger 104, the reflected light passes through a film layer of the OLED display panel 102 and is received by the micro optical sensor 1012, and the flexible circuit board 1011 identifies the contour shape of the surface of the finger 104 according to a light model captured by the micro optical sensor 1012, so as to implement the under-screen fingerprint identification.
Receive the influence of the unevenness of finger line among the present screen fingerprint identification technology, the light of reflection has strong and weak, and the reflection light that miniature optical sensor snatched is very weak, has influenced the sensitization sensitivity greatly, can't realize the technical problem of higher fingerprint identification rate, needs the improvement.
Disclosure of Invention
The invention provides a fingerprint identification circuit and an OLED display panel, which can solve the technical problems that reflected light is strong and weak due to the influence of unevenness of finger lines in the conventional under-screen fingerprint identification technology, reflected light captured by a micro optical sensor is very weak, the photosensitive sensitivity is greatly influenced, and higher fingerprint identification rate cannot be realized.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the invention provides a fingerprint identification circuit which comprises a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a capacitor unit, a voltage detection line, an analog-to-digital converter and a controller.
The movable polar plate on one side of the capacitor unit is electrically connected to the third node (C), and the fixed polar plate on the other side of the capacitor unit is electrically connected to the first node (A) and is used for deforming the movable polar plate and/or enabling the movable polar plate to approach the fixed polar plate after the movable polar plate is touched or pressed; and after the touch or the press disappears, the movable polar plate automatically resets to the original state.
The gate of the first thin film transistor (T1) is electrically connected to the first node (a), the source is electrically connected to the third node (C), the drain is electrically connected to the second node (B), and the first node (a) is electrically connected to a reference voltage Vref.
The gate of the second thin film transistor (T2) is electrically connected to a first scan voltage (scan1), the source is electrically connected to the first node (a), and the drain is electrically connected to the second node (B).
The gate of the third thin film transistor (T3) is electrically connected to the second scan voltage (scan2), the source is electrically connected to the second node (B), and the drain is electrically connected to a voltage detection line, which is used for detecting the voltage of the second node (B) and sending the voltage of the second node (B) to the analog-to-digital converter.
The gate of the fourth thin film transistor (T4) is electrically connected to the reference voltage (EM), the source is electrically connected to the second node (B), and the drain is electrically connected to the power supply negative Voltage (VSS).
The gate of the fifth thin film transistor (T5) is electrically connected to the reference voltage (EM), the source is electrically connected to the positive power supply Voltage (VDD), and the drain is electrically connected to the third node (C).
The analog-to-digital converter is used for acquiring the voltage of a second node (B), converting the voltage into a digital signal and sending the digital signal to the controller, the controller compares the digital signal with a standard digital signal corresponding to a stored fingerprint, and if the difference between the digital signal and the standard digital signal is smaller than a threshold value, the touch fingerprint corresponding to the digital signal is determined to be the fingerprint stored in the controller.
According to a preferred embodiment of the present invention, the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), and the fifth thin film transistor (T5) are all P-type thin film transistors.
According to a preferred embodiment of the present invention, in a reset phase, the reference voltage (EM) is a high potential signal, the first scan voltage (scan1) and the second scan voltage (scan2) are low potential signals, the fourth thin film transistor (T4) and the fifth thin film transistor (T5) are in an off state, the first thin film transistor (T1), the second thin film transistor (T2) and the third thin film transistor (T3) are in an on state, and a source and a drain of the first thin film transistor (T1) charge both ends of the capacitor unit.
According to a preferred embodiment of the present invention, in the sensing phase, the reference voltage (EM) is a low potential signal, the first scan voltage (scan1) is a high potential signal, the second scan voltage (scan2) is a low potential signal, the second thin film transistor (T2) is in an off state, and the third thin film transistor (T3), the fourth thin film transistor (T4) and the fifth thin film transistor (T5) are in an on state.
According to a preferred embodiment of the present invention, the low voltage signal is in the range of-4V to-10V, and the high voltage signal is in the range of 0V to 16V.
According to a preferred embodiment of the present invention, the reference voltage Vref is a low-level signal, and the threshold is a positive integer.
According to a preferred embodiment of the present invention, the moving plate is made of an electrically conductive elastic plastic material.
According to the fingerprint identification circuit, the embodiment of the application also provides an OLED display panel, which comprises the fingerprint identification circuit.
According to a preferred embodiment of the present invention, the OLED display panel includes a driving circuit layer and a light emitting device layer located on a surface of the driving circuit layer, a fixed electrode plate and a movable electrode plate are respectively disposed on a surface of the driving circuit layer opposite to the light emitting device layer, an elastic medium layer is disposed between the driving circuit layer and the light emitting device layer, and the fixed electrode plate, the elastic medium layer and the movable electrode plate form a capacitor unit in the fingerprint identification circuit.
According to a preferred embodiment of the present invention, the OLED display panel includes a driving circuit layer and a light emitting device layer located on a surface of the driving circuit layer, a source/drain electrode in the driving circuit layer is a fixed electrode plate, an anode in the light emitting device layer is a movable electrode plate, an elastic medium layer is disposed between the anode and the source/drain electrode, and the fixed electrode plate, the elastic medium layer, and the movable electrode plate form a capacitor unit in the fingerprint identification circuit.
The invention has the beneficial effects that: the invention provides a fingerprint identification circuit and an OLED display panel, wherein the fingerprint identification circuit is embedded in the OLED display panel and comprises a capacitor unit, a movable polar plate of the capacitor unit is made of conductive elastic plastic materials, the movable polar plate can deform and approach to a fixed polar plate after being touched or pressed by a finger, the movable polar plate can be far away from the fixed polar plate and reset to the original state after the finger is released, the capacitor unit can change in the process of touch or pressing, the source/drain current flowing through a first thin film transistor in the fingerprint identification circuit can change to cause the voltage of a second node (B) to change, further the voltage of the second node (B) is measured, the voltage of the second node (B) is converted into a digital signal, and whether the area pressed by the fingerprint and the digital signal converted by the pressure are standard digital signals of stored fingerprint information or not is evaluated, the fingerprint detection method is simple, easy to implement and high in sensitivity.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a fingerprint identification structure in a conventional OLED display panel.
Fig. 2 is a schematic diagram of a fingerprint identification circuit according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram illustrating a variation of a driving signal in a fingerprint identification circuit according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of an OLED display panel according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of another OLED display panel according to an embodiment of the present disclosure.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals, and broken lines in the drawings indicate that the elements do not exist in the structures, and only the shapes and positions of the structures are explained.
The invention aims at the technical problems that in the existing under-screen fingerprint identification technology, due to the influence of unevenness of fingerprint lines, reflected light is strong and weak, reflected light captured by a micro optical sensor is very weak, the photosensitive sensitivity is greatly influenced, and higher fingerprint identification rate cannot be realized.
As shown in fig. 2, the present embodiment provides a fingerprint identification circuit, which includes a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a capacitor unit 201, a voltage detection line 202, an analog-to-digital converter 204, and a controller 205.
The gate of the first thin film transistor (T1) is electrically connected to the first node (a), the source is electrically connected to the third node (C), the drain is electrically connected to the second node (B), the first node (a) is electrically connected to a reference voltage Vref, and the reference voltage Vref is used for enabling the first thin film transistor (T1) to be in a conducting state; the gate of the second thin film transistor (T2) is electrically connected to the first scan voltage (scan1), the source is electrically connected to the first node (a), and the drain is electrically connected to the second node (B).
The removal polar plate electric connection of electric capacity unit 201 one side is in third node (C), opposite side fixed polar plate electric connection is in first node (A), the removal polar plate forms for electrically conductive elastoplastic material preparation, touch or press the removal polar plate with the finger after, the removal polar plate can take place to deform, and be close to fixed polar plate, loosen and point back, the removal polar plate can keep away from fixed polar plate, and the reconversion, press and the in-process of loosening, the electric capacity of electric capacity unit 201 can change, lead to second node (B) voltage can change.
The gate of the third thin film transistor (T3) is electrically connected to the second scan voltage (scan2), the source is electrically connected to the second node (B), the drain is electrically connected to the voltage detection line 202, the voltage detection line 202 is used for detecting the voltage of the second node (B) and sending the voltage of the second node (B) to the analog-to-digital converter 204, wherein the voltage detection line 202 is further connected to a parasitic capacitor 203 to prevent the voltage detection line 202 from being damaged due to an excessive current, and the voltage detection line 202 further provides the reference voltage Vref for the first node (a).
The analog-to-digital converter 204 is configured to convert the voltage of the second node (B) into a digital signal, and send the digital signal to the controller 205, where the controller 205 compares the digital signal with a standard digital signal corresponding to a stored fingerprint, and if a difference between the digital signal and the standard digital signal is smaller than a threshold, determines that the touch fingerprint corresponding to the digital signal is the fingerprint stored in the controller 205, where the threshold is preferably a positive integer.
A gate of the fourth thin film transistor (T4) is electrically connected to the reference voltage (EM), a source thereof is electrically connected to the second node (B), and a drain thereof is electrically connected to the power supply negative Voltage (VSS); the gate of the fifth thin film transistor (T5) is electrically connected to the reference voltage (EM), the source is electrically connected to the positive power supply Voltage (VDD), and the drain is electrically connected to the third node (C).
Specifically, as shown in fig. 2 and 3, the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), and the fifth thin film transistor (T5) in the present embodiment are preferably P-type thin film transistors. In the reset phase, the reference voltage (EM) is a high potential signal, the first scan voltage (scan1) and the second scan voltage (scan2) are low potential signals, the fourth thin film transistor (T4) and the fifth thin film transistor (T5) are in an off state, the first thin film transistor (T1), the second thin film transistor (T2) and the third thin film transistor (T3) are in an on state, and a source and a drain of the first thin film transistor (T1) charge both ends of the capacitor unit. In the sensing stage, the reference voltage (EM) is a low-potential signal, the first scan voltage (scan1) is a high-potential signal, the second scan voltage (scan2) is a low-potential signal, the second thin film transistor (T2) is in an off state, the third thin film transistor (T3), the fourth thin film transistor (T4) and the fifth thin film transistor (T5) are in an on state, wherein the low-potential signal is in a range of-4V to-10V, the high-potential signal is in a range of 0V to 16V, and the reference voltage Vref is a low-potential signal. As shown in fig. 3, in the two states of pressing and releasing, the voltage detection line 202 detects that the two voltage values of the second node (B) are different, in the pressed state, the distance between the two plates of the capacitor unit 201 is decreased due to the deformation of the moving plate in the capacitor unit 201 and the approach of the moving plate to the fixed plate, the capacitance of the capacitor unit 201 is increased, the source/drain current flowing through the first thin film transistor (T1) is increased, and the voltage value of the second node (B) is increased, and after the capacitor unit 201 is touched or pressed, the current flowing through the first thin film transistor (T1) and the voltage of the second node (B) in the fingerprint identification circuit are changed, and different pressing areas and pressures are different, and the current flowing through the first thin film transistor (T1) and the voltage of the second node (B) are different, based on this invention, the voltage detection line 202 is used to obtain the voltage of the second node (B), and the voltage of the second node (B) is converted into a digital signal, which is compared with a standard digital signal corresponding to a corresponding fingerprint in the controller 205, so as to identify the fingerprint under the screen.
According to the fingerprint identification circuit in the above embodiment, as shown in fig. 4 and fig. 5, the present application further provides an OLED display panel 300, where the OLED display panel 300 includes the fingerprint identification circuit in the above embodiment, and the fingerprint identification circuit is embedded inside the OLED display panel 300.
The OLED display panel 300 has a partial structure as follows: as shown in fig. 4, the OLED display panel includes a driving circuit layer and a light emitting device layer on a surface of the driving circuit layer, the driving circuit layer includes a flexible substrate 301, an active layer 3024 on a surface of the flexible substrate 301, a first gate insulating layer 3021 on the flexible substrate 301 and covering the active layer 3024, a first gate electrode 3025 on a surface of the first gate insulating layer 3021, a second gate insulating layer 3022 on the first gate insulating layer 3021 and covering the first gate electrode 3025, a second gate electrode 3026 on the second gate insulating layer 3022, an interlayer insulating layer 3023 on the second gate insulating layer 3022 and covering the second gate electrode 3026, a source electrode 3027 on the interlayer insulating layer 3023, a drain electrode 3028, and a fixed plate 3031. Preparing an elastic medium layer 3032 on the surface of the driving circuit layer, wherein the elastic medium layer 3032 covers the source electrode 3027, the drain electrode 3028 and the fixed pole plate 3031, then preparing a light emitting device layer on the surface of the elastic medium layer 3032, the light emitting device layer comprises an anode 3041, a movable pole plate 3033 and a pixel defining layer 3042, which are positioned on the surface of the elastic medium layer 3032, the anode 3041 is tiled with a light emitting layer 3043, a cathode layer 3044 is prepared on the surface of the pixel defining layer 3042, and finally a package cover plate 305 is prepared on the surface of the light emitting device layer, wherein the flexible substrate 301 comprises a first flexible layer 3011, a water blocking layer 3012 and a first flexible layer 3013, the source electrode 3027 is electrically connected with the source electrode contact region in the active layer 3024 through a source electrode contact hole, the drain electrode 3028 is electrically connected with the drain electrode contact region in the active layer 3024 through a drain electrode contact hole, the anode 3041 is electrically connected with the drain electrode 3028 through a, if a finger touches or presses the OLED display panel, the movable electrode plate 3033 moves towards the fixed electrode plate 3031 and deforms, the distance between the capacitor units decreases, the capacitance of the capacitor units increases, the current flowing through the first thin film transistor T1 and the voltage of the second node (B) change, the voltage of the second node (B) is the invention point of the present application, the analog-to-digital converter in the fingerprint identification circuit converts the voltage of the second node (B) into a digital signal, the controller compares the digital signal with a standard digital signal corresponding to a corresponding fingerprint in the controller, if the difference between the digital signal and the standard digital signal is smaller than a threshold value, the touch fingerprint corresponding to the voltage of the second node (B) is determined to be the fingerprint stored in the controller, the detection circuit does not need to be provided with an optical module, the area and the pressure pressed by the fingerprint are converted into corresponding digital signals, and the detection method is simple, easy to realize and high in sensitivity.
As shown in fig. 5, in the fingerprint identification circuit in this embodiment, the capacitor unit is disposed between the driving circuit layer and the light emitting device layer, the source electrode 3027 or the drain electrode 3028 in the driving circuit layer is a fixed plate at one side of the capacitor unit, the anode 3041 in the light emitting device layer is a movable plate at the other side of the capacitor unit, an elastic medium layer 3029 is disposed between the anode 3041 and the source electrode 3027 or the drain electrode 3028, and the anode 3041, the source electrode 3027 or the drain electrode 3028, and the elastic medium layer 3029 form the capacitor unit in the fingerprint identification circuit, and other structures are similar to those in fig. 4 and will not be described herein.
The invention provides a fingerprint identification circuit and an OLED display panel, wherein the fingerprint identification circuit is embedded in the OLED display panel and comprises a capacitor unit, a movable polar plate of the capacitor unit is made of conductive elastic plastic materials, the movable polar plate can deform and approach to a fixed polar plate after being touched or pressed by a finger, the movable polar plate can be far away from the fixed polar plate and reset to the original state after the finger is released, the capacitor unit can change in the processes of pressing, touching and releasing the finger, the source/drain current of a first thin film transistor in the fingerprint identification circuit can change to cause the voltage of a second node (B) to change, and further the voltage of the second node (B) is measured and converted into a digital signal to evaluate whether the area pressed by the fingerprint and the digital signal converted by the pressure are standard digital signals of stored fingerprint information or not, the fingerprint detection method is simple, easy to implement and high in sensitivity.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. A fingerprint identification circuit is characterized by comprising a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a capacitor unit, a voltage detection line, an analog-to-digital converter and a controller;
the movable polar plate on one side of the capacitor unit is electrically connected to the third node (C), and the fixed polar plate on the other side of the capacitor unit is electrically connected to the first node (A) and is used for deforming the movable polar plate and/or enabling the movable polar plate to approach the fixed polar plate after the movable polar plate is touched or pressed; after the touch or the press disappears, the movable polar plate automatically resets to the original state;
the gate of the first thin film transistor (T1) is electrically connected to a first node (a), the source is electrically connected to a third node (C), the drain is electrically connected to a second node (B), and the first node (a) is electrically connected to a reference voltage Vref;
a gate of the second thin film transistor (T2) is electrically connected to a first scan voltage (scan1), a source is electrically connected to the first node (a), and a drain is electrically connected to the second node (B);
the gate of the third thin film transistor (T3) is electrically connected to a second scan voltage (scan2), the source is electrically connected to the second node (B), and the drain is electrically connected to a voltage detection line, which is used for detecting the voltage of the second node (B) and sending the voltage of the second node (B) to the analog-to-digital converter;
a gate of the fourth thin film transistor (T4) is electrically connected to the reference voltage (EM), a source thereof is electrically connected to the second node (B), and a drain thereof is electrically connected to the power supply negative Voltage (VSS);
a gate of the fifth thin film transistor (T5) is electrically connected to the reference voltage (EM), a source thereof is electrically connected to the positive power supply Voltage (VDD), and a drain thereof is electrically connected to the third node (C);
the analog-to-digital converter is used for acquiring the voltage of a second node (B), converting the voltage into a digital signal and sending the digital signal to the controller, the controller compares the digital signal with a standard digital signal corresponding to a stored fingerprint, and if the difference between the digital signal and the standard digital signal is smaller than a threshold value, the touch fingerprint corresponding to the digital signal is determined to be the fingerprint stored in the controller.
2. The fingerprint recognition circuit according to claim 1, wherein the first thin film transistor (T1), the second thin film transistor (T2), the third thin film transistor (T3), the fourth thin film transistor (T4), and the fifth thin film transistor (T5) are all P-type thin film transistors.
3. The fingerprint recognition circuit according to claim 2, wherein in a reset phase, the reference voltage (EM) is a high potential signal, the first scan voltage (scan1) and the second scan voltage (scan2) are low potential signals, the fourth thin film transistor (T4) and the fifth thin film transistor (T5) are in an off state, the first thin film transistor (T1), the second thin film transistor (T2) and the third thin film transistor (T3) are in an on state, and a source and a drain of the first thin film transistor (T1) charge both ends of the capacitor unit.
4. The fingerprint recognition circuit according to claim 3, wherein during the sensing phase, the reference voltage (EM) is a low-potential signal, the first scan voltage (scan1) is a high-potential signal, the second scan voltage (scan2) is a low-potential signal, the second thin film transistor (T2) is in an off state, and the third thin film transistor (T3), the fourth thin film transistor (T4) and the fifth thin film transistor (T5) are in an on state.
5. The fingerprint identification circuit of claim 4, wherein the low voltage signal is in a range of-4V to-10V, and the high voltage signal is in a range of 0V to 16V.
6. The fingerprint identification circuit of claim 1, wherein the reference voltage Vref is a low signal and the threshold is a positive integer.
7. The fingerprint identification circuit of claim 1, wherein the moving plate is made of an electrically conductive elastoplastic material.
8. An OLED display panel comprising the fingerprint recognition circuit of any one of claims 1 to 7.
9. The OLED display panel of claim 8, wherein the OLED display panel comprises a driving circuit layer and a light emitting device layer located on the surface of the driving circuit layer, a fixed electrode plate and a movable electrode plate are respectively disposed on the surfaces of the driving circuit layer opposite to the light emitting device layer, an elastic medium layer is disposed between the driving circuit layer and the light emitting device layer, and the fixed electrode plate, the elastic medium layer and the movable electrode plate form a capacitor unit in the fingerprint identification circuit.
10. The OLED display panel of claim 8, wherein the OLED display panel comprises a driving circuit layer and a light emitting device layer located on a surface of the driving circuit layer, a source/drain electrode in the driving circuit layer is a fixed electrode plate, an anode in the light emitting device layer is a movable electrode plate, an elastic medium layer is arranged between the anode and the source/drain electrode, and the fixed electrode plate, the elastic medium layer and the movable electrode plate form a capacitor unit in the fingerprint identification circuit.
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