CN114581964A - Screen lower fingerprint identification circuit and laminated structure thereof, display panel and fingerprint acquisition method - Google Patents
Screen lower fingerprint identification circuit and laminated structure thereof, display panel and fingerprint acquisition method Download PDFInfo
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- CN114581964A CN114581964A CN202210162315.0A CN202210162315A CN114581964A CN 114581964 A CN114581964 A CN 114581964A CN 202210162315 A CN202210162315 A CN 202210162315A CN 114581964 A CN114581964 A CN 114581964A
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- G—PHYSICS
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- 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
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- 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
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- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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Abstract
A fingerprint identification circuit under screen includes a first transistor having a drain connected to a display data receiving terminal, a display driving signal output terminal and a start fingerprint identification terminal connected to a gate of the first transistor, a source of the first transistor connected to an optical fingerprint sensor, a common ground terminal connected to the optical fingerprint sensor, a second transistor having a gate connected to the first transistor, a source of the second transistor connected to a third transistor, a drain of the second transistor connected to a working voltage terminal, a gate of the third transistor connected to a fingerprint identification selection terminal, a source of the third transistor connected to an identification output terminal, a first capacitor and a second capacitor connected in parallel to the optical fingerprint sensor, so that the first transistor receives a display driving signal or resets a fingerprint identification signal and outputs a display driving signal or performs fingerprint identification, the display panel also comprises a laminated structure designed according to the fingerprint identification circuit under the screen, and a fingerprint acquisition method.
Description
Technical Field
The present invention relates to under-screen fingerprint identification, and more particularly, to an under-screen fingerprint identification circuit, a stack structure matched with the under-screen fingerprint identification circuit, a display panel having the stack structure, and a fingerprint capture method for the display panel.
Background
In recent years, fingerprint recognition has become the standard equipment of intelligent electronic products, and in the early capacitive fingerprint recognition, a sensor is composed of a plurality of tiny capacitor arrays, when a user touches the sensor with a finger, the finger will contact the capacitor at the convex part of the fingerprint, but will not contact the concave part of the fingerprint, so that capacitance difference is generated, and the fingerprint can be drawn. However, the capacitive fingerprint sensor occupies a part of the surface of the smart electronic product, and the recent design trend of the smart electronic product is toward the design of a full screen, so that the capacitive fingerprint sensor gradually disappears in the smart electronic product.
Instead, there are two under-screen fingerprint recognition technologies, such as an optical fingerprint recognition structure (hereinafter referred to as an under-screen fingerprint recognition technology) combined in a liquid crystal screen stack of a smart electronic product, or an ultrasonic fingerprint recognition structure combined in the liquid crystal screen stack, in terms of the under-screen fingerprint recognition technology, an equivalent optical fingerprint recognition sensing circuit 11 and an equivalent driving circuit 12 of each pixel 10 in a fingerprint recognition area of a liquid crystal screen are two independent and unconnected circuits (as shown in fig. 1), a common equivalent optical fingerprint recognition sensing circuit 11 is a 3T1C circuit (as shown in fig. 2), and the equivalent driving circuit 12 is a 1T1C circuit (as shown in fig. 3) or a 2T1C circuit.
Referring to fig. 4, the lcd stacked structure 13 of the optical on-screen fingerprint identification technology includes a display area 130, a touch area 131, a fingerprint identification area 132, and the like, and the display area 130, the touch area 131, and the fingerprint identification area 132 are respectively provided with a metal through hole 133 to connect different layers for realizing the equivalent optical fingerprint identification sensing circuit 11 and the equivalent driving circuit 12, and an optical fingerprint identifier 1320 of the fingerprint identification area 132 is deeply buried in the middle of the lcd stacked structure 13, so that the optical fingerprint identifier 1320 is far from the surface of the lcd, which will affect the identification efficiency of the optical fingerprint identifier 1320, and the display area 130, the touch area 131, and the fingerprint identification area 132 all need a transparent conductive layer 134, and the transparent conductive layer 134 is usually Indium Tin Oxide (ITO), but it can be seen from the figure that the position of the transparent conductive layer 134 of the fingerprint identification area 132 is completely different from the positions of the transparent conductive layer 134 of the display area 130 and the touch area 131 Therefore, the fingerprint sensing area 132 needs additional processes to manufacture the equivalent fingerprint sensing circuit 11.
In summary, since the equivalent driving circuit 12 and the equivalent optical fingerprint sensor circuit 11 are two independent circuits, therefore, many equivalent electronic components required for making equivalent circuits are required in the liquid crystal screen stack structure 13, which reduces the aperture ratio of the liquid crystal screen stack structure 13 and affects the overall light emitting efficiency, and moreover, the position of the transparent conductive layer 134 of the fingerprint identification area 132 is completely different from the position of the transparent conductive layer 134 of the display area 130 and the touch area 130, the manufacturing process of the conventional optical under-screen fingerprint identification technology becomes more complicated, which reduces the production yield, therefore, how to improve the equivalent driving circuit and equivalent optical fingerprint recognition sensing circuit of the optical under-screen fingerprint recognition technology, further, it is an urgent problem to improve the aperture ratio, improve the stacked structure of the liquid crystal display, and reduce the complicated manufacturing process.
Disclosure of Invention
In view of the problems of the prior art, an object of the present invention is to integrate a conventional equivalent driving circuit and an equivalent optical fingerprint sensing circuit, and to increase an aperture ratio and improve the overall light emitting efficiency by reducing the number of equivalent electronic components required for fabricating an equivalent circuit in a stacked structure. Since the equivalent driving circuit and the equivalent optical fingerprint sensing circuit are integrated, the conventional fingerprint sensing operation method is not applicable, and another object of the present invention is to provide a new operation process for fingerprint capturing by the display panel.
According to an object of the present invention, there is provided an under-screen fingerprint identification circuit, comprising a first transistor, a second transistor, a third transistor, a first capacitor, a second capacitor and an optical fingerprint sensor, wherein a drain of the first transistor is connected to a display data receiving terminal, a gate of the first transistor is connected to a data output terminal and a fingerprint resetting information terminal for receiving a display driving signal from the data output terminal or receiving a fingerprint resetting signal from the fingerprint resetting information terminal, a source of the first transistor is connected to the optical fingerprint sensor, the optical fingerprint sensor is connected to a common ground terminal, the optical fingerprint sensor is connected to the first capacitor in parallel, a second capacitor is connected between the optical fingerprint sensor and the first capacitor in parallel, a gate of the second transistor is connected between the drain of the first transistor and the optical fingerprint sensor, and a second transistor is connected to a working voltage terminal, the source of the second transistor is connected to the drain of the third transistor, the gate of the third transistor is connected to the fingerprint identification selection terminal for receiving the fingerprint identification signal, and the source of the third transistor is connected to the identification output terminal.
Wherein the first transistor is in an identification mode when receiving the reset fingerprint identification signal from the reset fingerprint information terminal and is in a display mode when not receiving the reset fingerprint identification signal, the first transistor is sequentially subjected to a reset stage, an exposure stage and a rendering stage in the identification mode, the first transistor receives the reset fingerprint identification signal from the reset fingerprint information terminal during the reset stage, the first transistor, the second transistor and the third transistor are turned on to release parasitic capacitance in lines of the second transistor and the third transistor, the first transistor, the second transistor and the third capacitor are turned off during the exposure stage, and the display driving signal is stored in the first capacitor first and the optical fingerprint sensor is turned on, the first transistor is turned off and the third transistor is turned on during the rendering stage, and the second capacitor is controlled to be turned on according to the optical fingerprint sensor sensing fingerprint, the working voltages with different magnitudes are output from the identification output terminal, and the display driving signal in the first capacitor is transmitted to the display data receiving terminal.
In the fingerprint identification circuit under the screen, the first transistor, the second transistor are turned on and the third transistor is turned off, and the gate of the first transistor receives the display driving signal from the data output terminal and transmits the display driving signal to the display data receiving terminal, while the second transistor is turned on but the third transistor is turned off, so that the working voltage cannot be output.
Wherein the first capacitor is an energy storage capacitor, and the second capacitor stabilizes the operation of the optical fingerprint sensor.
According to another aspect of the present invention, a stacked structure for under-screen fingerprint recognition is provided, which includes a substrate, a first unit and a second unit, wherein the substrate, the first unit and the second unit are sequentially stacked from bottom to top, a plurality of pixel regions are defined among the substrate, the first unit and the second unit, wherein at least a display sub-region and a recognition sub-region are defined in a part of the pixel regions, a display device is disposed at a position of the first unit corresponding to the display sub-region, an optical fingerprint sensor is disposed at a position of the second unit corresponding to the display sub-region, an equivalent under-screen fingerprint recognition circuit is formed between the first unit and the second unit, and the display device and the optical fingerprint sensor are connected to the equivalent under-screen fingerprint recognition circuit in the second unit.
Wherein, the first unit comprises a buffer Layer (ILD), a gate insulating Layer, an interlayer dielectric Layer (ILD), and a flat Layer sequentially stacked from bottom to top, wherein the substrate is provided with a shielding metal in the projection position of the display sub-region, the buffer Layer is provided on the substrate and covers the shielding metal, a drain semiconductor component and a source semiconductor component as a first transistor, a second transistor and a third transistor are provided above the buffer Layer, and a polysilicon component separating the drain semiconductor component and the source semiconductor component are provided, the gate insulating Layer covers the drain semiconductor component, the source semiconductor component and the polysilicon component, the gate semiconductor components and the first metal regions of the first transistor, the second transistor and the third transistor are provided above the gate insulating Layer, and the gate of the first transistor is shielded by the shielding metal, the gate semiconductor component and the first metal region are not communicated or communicated with each other according to the requirement, an interlayer dielectric (ILD) layer covers the gate semiconductor assembly and the first metal region, a plurality of second metal regions are arranged on the ILD layer, the second metal regions are not communicated or communicated with each other on the ILD layer as required, and a flat layer covers the second metal regions.
Wherein, the second unit comprises a first insulating layer, a second insulating layer and third insulating layers which are sequentially laminated from bottom to top, the surface of the first insulating layer is provided with a plurality of third metal regions, each third metal region is not communicated or communicated with the first insulating layer according to the design requirement, the surface of the second insulating layer is provided with a common electrode at the position corresponding to the display sub-area and the identification sub-area, the surface of the third insulating layer is provided with a first electrode at the projection position corresponding to the display sub-area, the surface of the third insulating layer is provided with a second electrode at the projection position corresponding to the identification sub-area, wherein, the second insulating layer is internally provided with a display component between the first electrode and the common electrode, the display component is excited by the first electrode and the common electrode according to the display driving signal, the second insulating layer is internally provided with an optical fingerprint sensor between the second electrode and the common electrode, and one of the first electrodes extends out of the projection position of the display sub-area, the second electrode is connected to the third metal region, the second metal region and the drain semiconductor component in sequence through the metal through hole formed in the lower stacked structure, and the second electrode is connected to the third metal region, the second metal region and the first metal region in sequence through the metal through hole formed in the lower portion of the second electrode.
Wherein, the projection position of the third insulating layer surface corresponding to the identification sub-area is shielded by one of the third metal areas.
Each pixel area comprises a touch sub-area, and the second unit is provided with a touch circuit in the touch sub-area.
According to yet another aspect of the present invention, a display panel is provided, which includes a frame output region and a fingerprint identification region, wherein the fingerprint identification region is the above mentioned fingerprint identification stacked structure under a screen, and the difference between the frame output region and the fingerprint identification region is that the frame output region has only a display sub-region, and the fingerprint identification region is located in the frame output region, or the frame output region occupies a portion of the display panel, and the fingerprint identification region occupies a portion of the display panel.
According to another aspect of the present invention, a fingerprint capturing method for identifying a fingerprint under a screen is provided, which is applied to a display panel, the display panel is a fingerprint identification area as described above, the fingerprint identification area repeats the following steps during a display period and an identification period, during the display period, a display sub-area and a touch sub-area output a plurality of display frames according to display driving signals and perform touch sensing simultaneously, during the identification period, a reset period, an exposure period and a rendering period are used for outputting, during the reset period, the display sub-area outputs the display frames according to the display driving signals and resets the identification sub-area, during the exposure period, the display sub-area maintains the display frame during the reset period, the identification sub-area uses the light source of the display frame of the display sub-area as the exposure light source for fingerprint identification, during the rendering period, the display sub-area maintains the display frame during the reset period, the recognition sub-area begins to trace the fingerprint pattern.
The reset stage, the exposure stage and the drawing stage are respectively performed within the time of outputting a frame of picture.
Accordingly, the conventional equivalent driving circuit and the equivalent optical fingerprint identification sensing circuit are integrated, so that the under-screen fingerprint identification laminated structure is manufactured according to the equivalent circuit, the opening ratio of the under-screen fingerprint identification laminated structure is increased due to the reduction of electronic components of the equivalent circuit, the purpose of improving the overall luminous efficiency is achieved, the manufacturing is simplified, the manufacturing time is reduced, and the purpose of reducing the manufacturing cost is achieved. The fingerprint acquisition method for fingerprint identification under the screen can maintain the output of the picture, can also carry out fingerprint identification at the same time, and can even be used as a touch panel.
Drawings
Fig. 1 is a schematic diagram of an equivalent driving circuit and an equivalent optical fingerprint sensing circuit of one pixel in a fingerprint identification area of a conventional liquid crystal screen;
FIG. 2 is a diagram of a conventional equivalent optical fingerprint sensing circuit;
FIG. 3 is a schematic diagram of a conventional equivalent driving circuit;
FIG. 4 is a schematic diagram of a liquid crystal display stack-up structure of a conventional optical under-screen fingerprint identification technique;
FIG. 5 is a schematic diagram of a circuit for identifying fingerprints under a screen according to the present invention;
fig. 6 is a schematic view of a laminated structure for identifying fingerprints under a screen according to the present invention;
FIG. 7 is a schematic perspective view of a layout of a fingerprint identification stacked structure under a screen according to the present invention;
FIG. 8 is a diagram illustrating a display panel defining a frame output area and a fingerprint identification area;
FIG. 9 is a schematic diagram of a time-sharing operation of the image output area and the fingerprint identification area of the conventional display panel;
FIG. 10 is a schematic time-sharing operation diagram of the image output area and the fingerprint identification area of the display panel according to the present invention.
Reference numerals: 10 pixels; 11 identifying a sensing circuit; 12 an equivalent driving circuit; 13 liquid crystal screen laminated structure; 130 a display area; 131 touch control area; 132 a fingerprint identification area; 1320 an optical fingerprint recognizer; 134 a transparent conductive layer; 2, a fingerprint identification circuit under a screen; 20 a first transistor; 21 a second transistor; 22 a third transistor; 23 a first capacitance; 24 a second capacitance; 25 an optical fingerprint sensor; 250 resetting the fingerprint information terminal; 251 a fingerprint identification selection terminal; 252 identify an output; 26 displaying a data receiving end; 27 a data output terminal; 28 common ground; 29 working voltage terminal; 3, identifying a laminated structure of fingerprints under a screen; 30 a substrate; 31 a first unit; 310 a buffer layer; 311 a gate insulating layer; 312 an interlayer dielectric layer; 313 a planarization layer; 32 a second unit; 321 a first insulating layer; 322 a second insulating layer; 323 a third insulating layer; 33 shielding the metal; 341 a drain semiconductor element; 342 a source semiconductor element; 343 a polysilicon element; 344 gate semiconductor element; 35 a first metal region; 36 a second metal region; 37 a third metal region; 38 a common electrode; 390 a first electrode; 391 a second electrode; 4 pixel regions; 40 display sub-region; 41 identifying a sub-region; 42 touch sub-area; 6 a display panel; 60 picture output areas; 62 fingerprint identification area; s101, during display and touch control; s102, displaying and identifying period; S1011-S1014 displaying the picture and simultaneously performing touch sensing; s1021, displaying a picture; s1022 starts fingerprint identification; s1023 displaying and fingerprint identifying exposure; s1024, depicting a fingerprint; s201, during displaying and touch control; s202, identifying a display period; S2011-S2014 display frames and perform touch sensing simultaneously; s2021 reset phase; s2022 exposure phase; s2023 depicts a stage; S1-S2 and L1-L4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention relates to an under-screen fingerprint identification circuit, as shown in fig. 5, the under-screen fingerprint identification circuit 2 includes a first transistor 20, a second transistor 21, a third transistor 22, a first capacitor 23, a second capacitor 24 and an optical fingerprint sensor 25, wherein the drain of the first transistor 20 is connected to a display data receiving terminal 26, the gate of the first transistor 20 is connected to a data output terminal 27 and a fingerprint resetting terminal 250 for receiving a display driving signal from the data output terminal 27 or receiving a fingerprint resetting signal from the fingerprint resetting terminal 250, the source of the first transistor 20 is connected to the optical fingerprint sensor 25, the optical fingerprint sensor 25 is connected to a common ground terminal 28, the optical fingerprint sensor 25 is connected to the first capacitor 23 in parallel, a second capacitor 24 is connected between the optical fingerprint sensor 25 and the first capacitor 23 in parallel, the gate of the second transistor 21 is connected between the source of the first transistor 20 and the optical fingerprint sensor 25, the drain of the second transistor 21 is connected to the working voltage terminal 29, the source of the second transistor 21 is connected to the drain of the third transistor 22, the gate of the third transistor 22 is connected to the fingerprint identification selection terminal 251 for receiving the fingerprint identification signal, and the source of the third transistor 22 is connected to the identification output terminal 252.
Therefore, the traditional equivalent driving circuit and the equivalent optical fingerprint identification sensing circuit can be integrated, so that the subsequent under-screen fingerprint identification laminated structure according to the design can reduce the design of equivalent electronic components, reduce a plurality of wiring spaces (such as the space for arranging a conductive through hole (Via)), and increase the aperture opening ratio, which refers to the proportional relation between the light passing area of the wiring area not including pixels and the transistor area and the whole pixel area.
In the present invention, the first transistor 20 is in the identification mode when receiving the reset fingerprint identification signal from the reset fingerprint information terminal 250, and is in the display mode when the first transistor 20 does not receive the reset fingerprint identification signal.
Still further, the under-screen fingerprint identification circuit 2 will sequentially perform a reset stage, an exposure stage and a rendering stage in the identification mode, during the reset stage, the first transistor 20 receives the reset fingerprint identification signal from the reset fingerprint information terminal 250, and turns on the first transistor 20, the second transistor 21 and the third transistor 22, thereby releasing the parasitic capacitance in the lines of the second transistor 21 and the third transistor 22.
During the exposure phase, the first transistor 20, the second transistor 21 are turned on and the third capacitor is turned off, and the display driving signal is first stored in the first capacitor 23 and the optical fingerprint sensor 25 is turned on.
In the drawing stage, the first transistor 20 is turned off, the gate of the third transistor 22 is turned on by receiving a selection signal (generally referred to as "SEL"), the second capacitor 24 is controlled to be turned on according to the fingerprint type sensed by the optical fingerprint sensor 25, so that the operating voltage terminal 29 provides operating voltages of different magnitudes, and the operating voltages are transmitted to the identification output terminal 252 through the source and the drain of the second transistor 21 and the source and the drain of the third transistor 22, and are output from the identification output terminal 252, and the display driving signal in the first capacitor 23 is transmitted to the display data receiving terminal 26. The fingerprint pattern is defined by the shape of the ridges and valleys of the fingerprint sensed by the optical fingerprint sensor 25, so that the magnitude of the operating voltage passing through the second transistor 21 is controlled to achieve the purpose of tracing the fingerprint in the pixel.
In the on-screen fingerprint identification circuit 2, the first transistor 20, the second transistor 21 are turned on, the third transistor 22 is turned off, and the gate of the first transistor 20 receives the display driving signal from the data output terminal 27 and transmits the display driving signal to the display data receiving terminal 26, while the second transistor 21 is turned on, but the third transistor 22 is turned off, and the operating voltage cannot be outputted.
In the present invention, the first capacitor 23 is an energy storage capacitor, and the second capacitor 24 stabilizes the operation of the optical fingerprint sensor 25.
The invention relates to a stacked structure for under-screen fingerprint identification, as shown in fig. 6, a stacked structure for under-screen fingerprint identification 3 includes a substrate 30, a first unit 31 and a second unit 32, the substrate 30, the first unit 31 and the second unit 32 are sequentially stacked from bottom to top, a plurality of pixel regions 4 are defined among the substrate 30, the first unit 31 and the second unit 32, wherein at least a display sub-region 40 and an identification sub-region 41 are defined in a part of the pixel regions 4, a display component is disposed at a position of the first unit 31 corresponding to the display sub-region 40, an optical fingerprint sensor 25 is disposed at a position of the second unit 32 corresponding to the display sub-region 40, an equivalent under-screen fingerprint identification circuit 2 is formed between the first unit 31 and the second unit 32, and the display component and the fingerprint optical sensor 25 are connected to the equivalent under-screen fingerprint identification circuit in the second unit 32.
In the present invention, the first unit 31 includes a buffer Layer 310, a gate insulating Layer 311, an interlayer dielectric Layer 312, and a flat Layer 313 sequentially stacked from bottom to top, wherein the substrate 30 is provided with a shielding metal 33 in a projection position of the display sub-region 40, the buffer Layer 310 is disposed on the substrate 30 and covers the shielding metal 33, the shielding metal 33 shields the gate of the first transistor 20 to prevent the first transistor 20 from malfunctioning due to the influence of a backlight source under the substrate 30, a drain semiconductor element 341 and a source semiconductor element 342, which are used as the first transistor 20, the second transistor 21, and the third transistor 22, and a polysilicon element 343 separating the drain semiconductor element 341 and the source semiconductor element 342 are disposed above the buffer Layer 310, the gate insulating Layer 311 is disposed on the buffer Layer 310 and covers the drain semiconductor element 341 and the source semiconductor element 342 and the polysilicon element 343, the gate semiconductor device 344 and the first metal region 35 are disposed on the gate insulating layer 311, the gate semiconductor device 344 and the first metal region 35 are not connected to each other on the gate insulating layer 311, an inter-layer dielectric (ILD) 312 covers the gate semiconductor device 344 and the first metal region 35, a plurality of second metal regions 36 are disposed on the ILD 312, each of the second metal regions 36 is connected or disconnected to the planarization layer 313 according to design requirements, and the planarization layer 313 covers each of the second metal regions 36. Since the stack schematic diagram of the under-screen fingerprint identification stack structure 3 of fig. 6 mainly shows the stack state of each layer and the positions of the components disposed on each stack, it is not a complete equivalent stack structure of the under-screen fingerprint identification circuit (as shown in fig. 5), and it is shown in advance.
In the present invention, the second unit 32 includes a first insulating layer 321, a second insulating layer 322 and a third insulating layer 323 sequentially stacked from bottom to top, the first insulating layer 321 has a plurality of third metal regions 37 on the surface thereof, each third metal region 37 is connected or not connected to the first insulating layer 321 according to the design requirement, the second insulating layer 322 has a common electrode 38 on the surface thereof opposite to the display sub-area 40 and the identification sub-area 41, the third insulating layer 323 has a plurality of first electrodes 390 on the surface thereof opposite to the display sub-area 40, one of the first electrodes 390 extends to the outside of the projection position of the display sub-area 40 and sequentially connects the third metal region 37, the second metal region 36 and the drain semiconductor element 341 through the metal through hole 5 formed on the lower stacked structure, the third insulating layer 323 has a second electrode 391 on the surface thereof opposite to the projection position of the identification sub-area 41, wherein the second insulating layer 322 has a display device disposed between the first electrode 390 and the common electrode 38, and the display device (not shown) is activated by the first electrode 390 and the common electrode 38 according to the display driving signal, the second insulating layer 322 has an optical fingerprint sensor 25 disposed between the second electrode 391 and the common electrode 38, and the second electrode 391 is connected to the third metal region 37, the second metal region 36 and the first metal region 35 through a metal via 5 disposed thereunder.
In the present invention, the first electrode 390, the second electrode 391 and the common electrode 38 can be transparent electrodes, for example: indium Tin Oxide (ITO), and it can be seen from fig. 6 that the display sub-region 40 and the identification sub-region 41 use the common electrode 38, and the optical fingerprint sensor 25 is disposed in the second unit, so the manufacturing process of this structure is simpler, and the optical fingerprint sensor 25 is closer to the surface.
In addition, the projection position of the surface of the third insulating layer 323 corresponding to the identification sub-area 41 is shielded by one of the third metal areas 37, so as to prevent the light source of the backlight module under the substrate 30 from interfering with the optical fingerprint sensor 25, and thus prevent the optical fingerprint sensor 25 from malfunctioning. Furthermore, each pixel area 4 includes a touch sub-area 42, and the second unit 32 sets a touch circuit in the touch sub-area 42. That is, the invention can not only perform fingerprint identification under the screen, but also perform touch control.
Referring to fig. 7, fig. 7 is a perspective view of a layout of a fingerprint identification laminated structure under a screen according to the present invention, which only shows part of device positions and signal input positions, and is not distinguished by solid and dotted lines according to the sequence of layers, and fig. 7 is mainly used for explaining and showing positions for increasing an aperture ratio, and is shown in advance. In fig. 7, the areas marked as S1 and S2 are positions where the aperture ratio is increased, and the conventional under-screen fingerprint identification laminated structure is provided with metal through holes in the areas opposite to S1 and S2, and the aperture ratio is increased because the metal through holes do not need to be provided in the areas of S1 and S2 in the present invention. In addition, the positions of the first capacitor 23 and the optical fingerprint sensor 25 are marked on the figure, and the mark L1 is the position connected to the fingerprint identification selection terminal 251, the mark L2 is the position connected to the scanning line and the fingerprint information reset terminal, the mark L3 is the position connected to the display data line, the working voltage terminal 29, the trace line of the touch sub-area, the common electrode 38 and the common ground terminal 28, and the mark L4 is the position connected to the data output terminal 27 and the identification output terminal 252.
As shown in fig. 8, the display panel 6 of the present invention includes a frame output region 60 and a fingerprint identification region 62, wherein each pixel in the fingerprint identification region 62 is the above-mentioned on-screen fingerprint identification laminated structure 3, which includes a display sub-region 40, an identification sub-region 41 and a touch sub-region 42, and the difference between the frame output region 60 and the fingerprint identification region 62 is that each pixel in the frame output region 60 includes the display sub-region 40 and the touch sub-region 42, or the display panel 6 of the present invention is all the fingerprint identification region 62, and each pixel in the fingerprint identification region 62 is the above-mentioned on-screen fingerprint identification laminated structure 3, which includes the display sub-region 40, the identification sub-region 41 and the touch sub-region 42.
Referring to fig. 4 and 9, the display area 130, the touch area 131 and the fingerprint identification area 132 of the conventional display panel are also similar to the display panel 6 of the present invention comprising the display sub-area 40, the touch sub-area 42 and the identification sub-area 41, but the conventional display panel has a different structure from the display panel of the present invention, so the conventional fingerprint capturing step for fingerprint identification under a screen is as follows,
(S101) performing a display and touch sensing period, and further performing a plurality of simultaneous touch sensing of the display screen during the display and touch sensing period (S1010-S1014), wherein the simultaneous touch sensing of the display screen is performed by the display area 130 and the touch area 131, and four simultaneous touch sensing of the display screen is taken as an example;
(S102) entering a display and recognition period, which is activated by the display area 130 and the fingerprint recognition area 132 during the display and recognition period, further comprising the following stages:
(S1021) displaying a frame, wherein the display area 130 outputs a frame;
(S1022) activating the fingerprint recognition, wherein the display area 130 outputs a frame of image, and the optical fingerprint recognizer 1320 of the fingerprint recognition area 132 is activated;
(S1023) displaying and fingerprint identifying exposure, in particular, the display area 130 outputs a frame of picture, the fingerprint identifying area 132 performs fingerprint identifying exposure;
(S1024) tracing a fingerprint, which is performed by the fingerprint recognition area 132;
the display area 130 is activated during the display and fingerprint identification exposure stages, and the fingerprint identification area 132 is activated during the display, fingerprint identification start, display and fingerprint identification exposure stages, and the display and touch periods and the display and identification periods are performed in a cycle.
However, the conventional fingerprint capturing method for under-screen fingerprint identification is not applicable to the display panel 6 of the present invention, as shown in fig. 10, a fingerprint capturing method for under-screen fingerprint identification of the present invention is applied to the display panel 6 of the present invention, and the fingerprint identification area 62 of the display panel 6 includes a display sub-area 40, an identification sub-area 41 and a touch sub-area 42, and includes the following steps:
(S201) during the display and touch control period, the display sub-area 40 and the touch sub-area 42 output a plurality of times of display frames according to the display driving signals and perform touch control sensing simultaneously (S2011-2014), in the present invention, four times of display frames are output and touch control sensing is performed, but in the practical implementation, the present invention is not limited thereto;
(S202) identifying the display period, including the following stages:
(S2021) in the reset stage, the display sub-area 40 outputs the display frame according to the display driving signal, and the identification sub-area 42 is reset;
(S2022) an exposure stage in which the display sub-area 40 maintains the display frame in the reset stage, and the identification sub-area uses the light source of the display frame in the display sub-area as the exposure light source for fingerprint identification;
(S2023) outputting in the drawing stage, wherein the display sub-area 40 maintains the display screen in the reset stage, and the recognition sub-area 41 starts to draw the fingerprint pattern;
and the display and touch control period and the display and identification period are circularly performed, and the reset stage, the exposure stage and the drawing stage are respectively performed within the time of outputting a frame of display picture.
In addition, the reset stage, the exposure stage and the rendering stage are respectively time for outputting a frame of image, but the present invention is not limited thereto in practical implementation, and in summary, it can be seen from the above description and fig. 9 and 10 that the method for fingerprint acquisition for fingerprint identification under a screen of the present invention is completely different from the conventional method for fingerprint acquisition for fingerprint identification under a screen.
As described above, the under-screen fingerprint identification circuit 2 integrates the conventional equivalent driving circuit and the equivalent optical fingerprint identification sensing circuit, and reduces the number of electronic components, so that the under-screen fingerprint identification laminated structure manufactured according to the equivalent circuit increases the aperture ratio of the under-screen fingerprint identification laminated structure by reducing the number of electronic components, thereby achieving the purpose of improving the overall light-emitting efficiency. Moreover, the fingerprint acquisition method for fingerprint identification under the screen can maintain the output of the picture, can also carry out fingerprint identification at the same time, really achieves the aim of carrying out fingerprint identification, and even can be used as a touch panel.
The above detailed description is specific to possible embodiments of the present invention, but the above embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.
Claims (13)
1. A fingerprint identification circuit under screen, its characterized in that: the method comprises the following steps:
a first transistor, the drain of which is connected to a display data receiving terminal, the gate of which is connected to a data output terminal and a fingerprint reset information terminal, and receives a display driving signal from the data output terminal or a fingerprint reset identification signal from the fingerprint reset information terminal;
an optical fingerprint sensor connected between the source of the first transistor and a common ground;
a first capacitor in parallel with the optical fingerprint sensor;
the second capacitor is arranged between the first capacitor and the optical fingerprint sensor and is connected with the optical fingerprint sensor in parallel;
a second transistor, wherein a gate of the second transistor is connected between a source of the first transistor and the optical fingerprint sensor, and a drain of the second transistor is connected to an operating voltage terminal;
a third transistor, in which the drain of the third transistor is connected to the source of the second transistor, the gate of the third transistor receives the fingerprint identification signal, and the source of the third transistor is connected to the identification output terminal.
2. The under-screen fingerprint recognition circuit of claim 1, wherein: the first transistor is in an identification mode when receiving the reset fingerprint identification signal from the reset fingerprint information terminal, and is in a display mode when not receiving the reset fingerprint identification signal, in the identification mode, the reset fingerprint information terminal outputs the fingerprint identification signal, and simultaneously, the source of the third transistor is maintained to output the display driving signal to the display data receiving terminal, and in the display mode, the source of the first transistor only outputs the display driving signal to the display data receiving terminal.
3. The under-screen fingerprint recognition circuit of claim 2, wherein: the identification mode sequentially performs a reset stage, an exposure stage and a description stage;
during the reset phase: the first transistor receives the reset fingerprint identification signal from the reset fingerprint information terminal, and turns on the first transistor, the second transistor and the third transistor, so that the parasitic capacitance in the lines of the second transistor and the third transistor is released;
during the exposure phase: turning on the first transistor, the second transistor and the third capacitor, and a display driving signal is first stored in the first capacitor and the optical fingerprint sensor is turned on;
a drawing stage: the first transistor is turned off, the gate of the third transistor is turned on by receiving the identification value signal, the second capacitor is controlled to be turned on according to the fingerprint type sensed by the optical fingerprint sensor, so that the working voltage end provides different working voltages, the working voltages are transmitted to the identification output end through the source and the drain of the second transistor and the source and the drain of the third transistor and are output from the identification output end, and the display driving signal in the first capacitor is transmitted to the display data receiving end.
4. The under-screen fingerprint recognition circuit of claim 2, wherein: in the display mode, the first transistor and the second transistor are turned on, the third transistor is turned off, and the gate of the first transistor receives a display driving signal from the data output terminal and transmits the display driving signal to the display data receiving terminal.
5. The under-screen fingerprint recognition circuit of claim 1, wherein: the first capacitor is an energy storage capacitor.
6. The utility model provides a lamination structure is discerned to finger print under screen which characterized in that: the method comprises the following steps:
a substrate;
a first unit provided on the substrate; and
a second unit provided on the first unit;
wherein a plurality of pixel regions are defined among the substrate, the first unit and the second unit, each pixel region at least defines a display sub-region and an identification sub-region, and forms an equivalent under-screen fingerprint identification circuit as claimed in any one of claims 1 to 5;
the display assembly is arranged at the position of the first unit relative to the display sub-area;
and the optical fingerprint sensor is arranged at the position of the second unit relative to the identification subarea.
7. The under-screen fingerprint recognition laminated structure of claim 6, wherein: the substrate is provided with shielding metal in a projection position of a display sub-area, and the first unit includes:
a buffer layer disposed on the substrate and covering the shielding metal, a drain semiconductor element and a source semiconductor element serving as the first transistor, the second transistor and the third transistor, and a polysilicon element separating the drain semiconductor elements and the source semiconductor elements being disposed above the buffer layer;
a gate insulating layer disposed on the buffer layer and covering the drain semiconductor devices, the source semiconductor devices and the polysilicon devices, wherein the gate semiconductor devices of the first transistor, the second transistor and the third transistor and at least one first metal region are disposed above the gate insulating layer, and the shielding metal shields the gate semiconductor devices, and the first metal regions are not connected or connected with each other on the gate insulating layer as required;
an interlayer dielectric layer arranged on the gate insulating layer and covering the gate semiconductor assembly and the first metal region, wherein the interlayer dielectric layer is provided with a plurality of second metal regions, and the second metal regions are not communicated or communicated with each other on the interlayer dielectric layer as required; and
and the flat layer is arranged on the interlayer dielectric layer and covers the second metal areas.
8. The under-screen fingerprint recognition laminated structure of claim 7, wherein: the second unit includes:
the first insulating layer is arranged on the flat layer, and the surface of the first insulating layer is provided with a plurality of third metal areas which are not communicated or communicated with each other on the first insulating layer according to the design requirement;
the second insulating layer is arranged on the first insulating layer, and a common electrode is arranged on the surface of the second insulating layer at the position corresponding to the display subarea and the identification subarea; and
the third insulating layer is arranged on the second insulating layer, a first electrode is arranged on the surface of the third insulating layer at the projection position relative to the display sub-area, and a second electrode is arranged on the surface of the third insulating layer at the projection position relative to the identification sub-area;
the second insulating layer is provided with a display component between the first electrode and the common electrode, the display component is excited by the first electrode and the common electrode according to a display driving signal, the optical fingerprint sensor is arranged between the second electrode and the common electrode in the second insulating layer, one first electrode extends to the outside of the projection position of the display sub-area and is sequentially connected with the third metal area, the second metal area and the drain semiconductor component through a metal through hole arranged on the lower laminated structure, and in addition, the second electrode is sequentially connected with the lower third metal area, the second metal area and the first metal area through the metal through hole arranged below the second electrode.
9. The under-screen fingerprint recognition laminated structure of claim 8, wherein: the projection position of the third insulating layer surface corresponding to the identification sub-area shields the optical fingerprint sensor by one of the third metal areas.
10. The under-screen fingerprint recognition laminated structure of claim 8, wherein: each pixel area comprises a touch sub-area, and the second unit is provided with a touch circuit in the touch sub-area.
11. A display panel, characterized in that: the method comprises the following steps:
a picture output area; and
a fingerprint identification region that is the under-screen fingerprint identification laminate structure of claim 6;
the difference between the image output area and the fingerprint identification area is that the image output area only has a display sub-area, and the fingerprint identification area is located in the image output area, or the image output area is located on one part of the display panel, and the fingerprint identification areas are respectively located on the other part of the display panel.
12. A fingerprint acquisition method for identifying fingerprints under a screen is characterized in that: applied to a display panel, the display panel defining a fingerprint identification area, wherein the fingerprint identification area is the under-screen fingerprint identification laminated structure of claim 10, and the fingerprint identification area repeatedly performs the following steps during the display period and the identification period:
during the display period, the display sub-area and the identification sub-area output a plurality of times of display pictures according to the display driving signals and simultaneously perform touch sensing;
during the identification display period, the reset stage, the exposure stage and the drawing stage are used for outputting;
in the reset stage, the display sub-area outputs a display picture according to the display driving signal, and the identification sub-area is reset at the same time;
in the exposure stage, the display sub-area maintains the display picture in the reset stage, and the identification sub-area utilizes the light source of the display picture in the display sub-area as the exposure light source for fingerprint identification;
in the drawing stage, the display sub-area maintains the display picture in the reset stage, and the identification sub-area starts to draw the fingerprint pattern.
13. The method of claim 12, wherein: the reset stage, the exposure stage and the drawing stage are performed within a time period of outputting a frame of display screen.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210162315.0A CN114581964A (en) | 2022-02-22 | 2022-02-22 | Screen lower fingerprint identification circuit and laminated structure thereof, display panel and fingerprint acquisition method |
| TW111107276A TWI792929B (en) | 2022-02-22 | 2022-03-01 | Under-screen fingerprint identification circuit and a laminated structure thereof, display panel and fingerprint capture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210162315.0A CN114581964A (en) | 2022-02-22 | 2022-02-22 | Screen lower fingerprint identification circuit and laminated structure thereof, display panel and fingerprint acquisition method |
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| Publication Number | Publication Date |
|---|---|
| CN114581964A true CN114581964A (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210162315.0A Pending CN114581964A (en) | 2022-02-22 | 2022-02-22 | Screen lower fingerprint identification circuit and laminated structure thereof, display panel and fingerprint acquisition method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114581964A (en) |
| TW (1) | TWI792929B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114937418A (en) * | 2022-06-24 | 2022-08-23 | 业泓科技(成都)有限公司 | Pixel circuit with biological identification function |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11080505B2 (en) * | 2018-04-10 | 2021-08-03 | Waleed Sami Haddad | Under-screen fingerprint reader |
| US11244137B2 (en) * | 2019-12-03 | 2022-02-08 | Novatek Microelectronics Corp. | Fingerprint sensing control device and operation method thereof |
| TWI800822B (en) * | 2020-04-27 | 2023-05-01 | 聯詠科技股份有限公司 | Integrated driving device and operation method thereof |
| KR20210138184A (en) * | 2020-05-11 | 2021-11-19 | 삼성디스플레이 주식회사 | Fingerprint sensor and display device including the same |
| CN113869095A (en) * | 2020-06-30 | 2021-12-31 | 敦泰电子股份有限公司 | Fingerprint display apparatus and integrated circuit and method for driving the same |
-
2022
- 2022-02-22 CN CN202210162315.0A patent/CN114581964A/en active Pending
- 2022-03-01 TW TW111107276A patent/TWI792929B/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114937418A (en) * | 2022-06-24 | 2022-08-23 | 业泓科技(成都)有限公司 | Pixel circuit with biological identification function |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202334864A (en) | 2023-09-01 |
| TWI792929B (en) | 2023-02-11 |
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