A texture recognition substrate, driving method and device thereof

Abstract

The present invention provides a texture recognition substrate, a driving method and a device thereof, wherein the texture recognition substrate comprises a base substrate and a plurality of texture sensing units arranged in an array on the base substrate; each of the texture sensing units comprises a first photosensitive collector, a second photosensitive collector, a first optical path selection controller and a second optical path selection controller; wherein the first optical path selection controller is coupled in series with the first photosensitive collector under the control of a first sampling control end; the second optical path selection controller is coupled in series with the second photosensitive collector under the control of a second sampling control end, and the circuit after the series coupling is coupled in parallel with the first photosensitive collector.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a texture recognition substrate, and a driving method and device thereof. Background Art

[0002] Existing in-screen fingerprint recognition technologies that combine optical sensing with display mostly use a display backplane plus an amorphous silicon PIN device structure. In high-brightness environments, such as outdoors on a sunny day, natural light as stray light can easily cause the photosensitive device to saturate, making it impossible to distinguish the signal difference between the valleys and ridges of the fingerprint, interfering with normal fingerprint recognition. To this end, a PIN device structure with a low external quantum efficiency (EQE) can be used to ensure that it is not easy to saturate under strong light, so as to achieve the purpose of distinguishing between bright and dark states. However, in a weak light environment, because the EQE of the PIN device structure is too low, the photocurrent generated is very small, resulting in a reduced signal-to-noise ratio, and the fingerprint valley ridge signal cannot be effectively distinguished. As a result, how to take into account the fingerprint recognition accuracy under both strong light and weak light has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The present invention provides a pattern recognition substrate, a driving method and a device thereof, which are used to simultaneously take into account the fingerprint recognition accuracy under strong light and weak light.

[0004] In a first aspect, an embodiment of the present invention provides a texture recognition substrate, comprising:

[0005] A base substrate and a plurality of texture sensing units arranged in an array on the base substrate;

[0006] Each of the texture sensing units includes a first photosensitive collector, a second photosensitive collector, a first light path selection controller and a second light path selection controller;

[0007] Wherein, the first optical path selection controller is coupled in series with the first photosensitive collector under the control of the first sampling control terminal;

[0008] The second optical path selection controller is coupled in series with the second photosensitive collector under the control of the second sampling control terminal, and the serially coupled circuit is coupled in parallel with the first photosensitive collector.

[0009] In a possible implementation, the first optical path selection controller includes a first transistor, a gate of the first transistor is coupled to the first sampling control terminal, a first electrode of the first transistor is coupled to the signal output terminal, and a second electrode of the first transistor is coupled to the first electrode of the first photosensitive collector;

[0010] The second optical path selection controller includes a second transistor, a gate of the second transistor is coupled to the second sampling control terminal, a first electrode of the second transistor is coupled to the first electrode of the first photosensitive collector, and a second electrode of the second transistor is coupled to the first electrode of the second photosensitive collector.

[0011] In a possible implementation manner, along a direction away from the substrate, the first photosensitive collector and the second photosensitive collector are stacked in sequence.

[0012] In a possible implementation manner, the area of ​​the light-sensing region of the second light-sensitive collector is smaller than the area of ​​the light-sensing region of the first light-sensitive collector.

[0013] In a possible implementation, the second electrode of the first photosensitive collector is coupled to the second electrode of the second photosensitive collector and shares a same electrode, and the electrode is coupled to a reverse bias voltage terminal.

[0014] In a possible implementation manner, the first light path selection controller and the second light path selection controller are disposed between the substrate and the first photosensitive collector.

[0015] In a second aspect, an embodiment of the present invention provides a texture recognition device, comprising:

[0016] A texture recognition substrate as described in any one of the above items.

[0017] In a third aspect, an embodiment of the present invention provides a method for driving a texture recognition substrate as described in any one of the above items, comprising:

[0018] If the first signal is received, the first optical path selection controller and the second optical path selection controller are turned on to obtain the first texture data collected by the first photosensitive collector and the second photosensitive collector;

[0019] If the second signal is received, the first optical path selection controller is turned on to obtain the second texture data collected by the first photosensitive collector.

[0020] In a possible implementation, the method further includes:

[0021] If it is determined that the current light intensity is greater than the preset light intensity, generating the second signal;

[0022] If it is determined that the current light intensity is not greater than the preset light intensity, the first signal is generated.

[0023] In a possible implementation, if the first signal is received, the first light path selection controller and the second light path selection controller are turned on to obtain the first texture data collected by the first photosensitive collector and the second photosensitive collector, including:

[0024] If the first signal is received, a pulse signal with the same frequency is loaded to the first sampling control end and the second sampling control end;

[0025] Under the control of the same-frequency pulse signal, the first optical path selection controller and the second optical path selection controller are turned on to obtain the first texture data collected by the first photosensitive collector and the second photosensitive collector.

[0026] In a possible implementation, if the second signal is received, turning on the first optical path selection controller to obtain the second texture data collected by the first photosensitive collector includes:

[0027] If a second signal is received, the first control signal is applied to the first sampling control terminal, and the second control signal is applied to the second sampling control terminal;

[0028] Under the control of the first control signal, turning on the first optical path selection controller;

[0029] Under the control of the second control signal, the second optical path selector is disconnected to obtain the second texture data collected by the first photosensitive collector.

[0030] The beneficial effects of the present invention are as follows:

[0031] The embodiment of the present invention provides a texture recognition substrate, a driving method and a device thereof, wherein the texture recognition substrate includes a substrate substrate and a plurality of texture sensing units arranged in an array on the substrate substrate, each texture sensing unit includes a first photosensitive collector, a second photosensitive collector, a first optical path selection controller and a second optical path selection controller, the first optical path selection controller is coupled in series with the first photosensitive collector under the control of a first sampling control end, the second optical path selection controller is coupled in series with the second photosensitive collector under the control of a second sampling control end, and the circuit after the series coupling is coupled in parallel with the first photosensitive collector; in this way, under strong light, the first photosensitive collector can be controlled to collect texture data, if the first photosensitive collector with a smaller EQE is used, the saturation phenomenon of the texture sensing unit under strong light is avoided; under weak light, the first photosensitive collector and the second photosensitive collector can be controlled to collect texture data at the same time, thereby improving the photocurrent under weak light and ensuring the photoelectric conversion efficiency of the texture sensing unit under weak light. In this way, the fingerprint recognition accuracy under strong light and weak light is taken into account at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of one structure of an existing texture sensing circuit;

[0033] Figure 2 A schematic diagram of a top view structure of a texture recognition substrate provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a circuit structure of any texture sensing unit in a texture recognition substrate provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of a circuit structure of any texture sensing unit in a texture recognition substrate provided by an embodiment of the present invention;

[0036] Figure 5 For along Figure 2 A schematic diagram of one of the cross-sectional structures in the middle MM direction;

[0037] Figure 6 A schematic diagram of the structure of a texture recognition device provided by an embodiment of the present invention;

[0038] Figure 7 A method flow chart of a driving method of a texture recognition substrate provided by an embodiment of the present invention;

[0039] Figure 8 A method flow chart of a driving method of a texture recognition substrate provided by an embodiment of the present invention;

[0040] Fig. 9 for Figure 8 The method flow chart of step S101 in FIG.

[0041] Fig.10 for Figure 8 Flow chart of the method for step S102 in FIG.

[0042] Description of reference numerals:

[0043] 1-substrate substrate; 2-texture sensing unit; 3-first photosensor; 4-second photosensor; 5-first optical path selection controller; 6-second optical path selection controller; Gate1-first sampling control terminal; Gate2-second sampling control terminal; T1-first transistor; T2-second transistor; VBias-reverse bias voltage terminal; Read-signal output terminal; 10-texture recognition substrate. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. And in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The words "include" or "comprise" and the like used in the present invention mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects.

[0046] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, but are only intended to illustrate the content of the present invention. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0047] In related technologies, such as Figure 1 The figure shows a schematic diagram of one structure of an existing texture sensing circuit, which includes a thin film transistor (TFT) and an amorphous silicon PIN made by a low temperature polysilicon (LTPS) process; wherein GA represents a sampling control terminal, RD represents a signal readout terminal, and VB represents a reverse bias voltage terminal; under the control of the bias voltage loaded by the reverse bias voltage terminal VB and the sampling control signal loaded by the sampling control terminal GA, the texture sensing circuit realizes the collection and recognition of the texture data collected by the PIN. The texture sensing circuit has good performance in low-brightness environments such as indoors; but in high-brightness environments such as sunny outdoors, natural light as stray light has a greater impact on the PIN, which can easily cause device saturation, making it impossible to distinguish the signal difference of the fingerprint valley ridge, and interfering with normal fingerprint recognition. Once a PIN device structure with a lower EQE is used to avoid the problem of saturation under strong light, the fingerprint valley ridge signal cannot be effectively distinguished due to the small photocurrent under low brightness.

[0048] In view of this, an embodiment of the present invention provides a texture recognition substrate, a driving method and a device thereof, which are used to take into account the texture recognition accuracy under both strong light and weak light.

[0049] Combination Figure 2 and Figure 3 As shown, Figure 2 A schematic diagram of a top view of a texture recognition substrate provided by an embodiment of the present invention, Figure 3 This is a schematic diagram of a circuit structure of any texture sensing unit 2 in the texture recognition substrate. The texture recognition substrate includes:

[0050] A base substrate 1 and a plurality of texture sensing units 2 arranged in an array on the base substrate 1;

[0051] Each of the texture sensing units 2 includes a first photosensitive collector 3, a second photosensitive collector 4, a first light path selection controller 5 and a second light path selection controller 6;

[0052] Wherein, the first optical path selection controller 5 is coupled in series with the first photosensitive collector 3 under the control of the first sampling control terminal Gate1;

[0053] The second optical path selection controller 6 is coupled in series with the second photosensitive collector 4 under the control of the second sampling control terminal Gate2 , and the serially coupled circuit is coupled in parallel with the first photosensitive collector 3 .

[0054] In the specific implementation process, the texture recognition substrate includes a base substrate 1 and a plurality of texture sensing units 2 arranged in an array on the base substrate 1; the base substrate can be a rigid substrate or a flexible substrate, which is not limited here. In addition, those skilled in the art can also set the specific number of the plurality of texture sensing units 2 according to actual application needs, which is not limited here.

[0055] Each texture sensing unit 2 includes a first photosensitive collector 3, a second photosensitive collector 4, a first optical path selection controller 5 and a second optical path selection controller 6; the first photosensitive collector 3 and the second photosensitive collector 4 generally use PIN to realize their functions, and both can be used to collect texture data. The first optical path selection controller 5 is coupled in series with the first photosensitive collector 3 under the control of the first sampling control terminal Gate1; in this way, if the first optical path selection controller 5 is turned on by the first sampling control terminal Gate1 under strong light, the texture data can be collected by the first photosensitive collector 3; at this time, if the EQE of the first photosensitive collector 3 is low, the phenomenon of strong light saturation can be avoided, thereby ensuring the accuracy of texture recognition under strong light.

[0056] In addition, the second optical path selection controller 6 is coupled in series with the second photosensitive collector 4 under the control of the second sampling control terminal Gate2, and the circuit after the series coupling is coupled in parallel with the first photosensitive collector 3; in this way, if in weak light, the second optical path selection controller 6 is turned on by the second sampling control terminal Gate2, and the first optical path selection controller 5 is turned on by the first sampling control terminal Gate1, then the texture can be collected simultaneously by the first photosensitive collector 3 and the second photosensitive collector 4. At this time, even if the EQE of the first photosensitive collector 3 is low, since the texture sensing unit 2 can read the texture data collected by the first photosensitive collector 3 and the second photosensitive collector 4 at the same time, a larger photocurrent is guaranteed, thereby ensuring the texture recognition accuracy in weak light.

[0057] In the embodiment of the present invention, Figure 4 The diagram shows one circuit structure of the texture sensing unit 2. Specifically, the first optical path selection controller 5 includes a first transistor T1, the gate of the first transistor T1 is coupled to the first sampling control terminal Gate1, the first electrode of the first transistor T1 is coupled to the signal output terminal Read, and the second electrode of the first transistor T1 is coupled to the first electrode of the first photosensitive collector 3; the second optical path selection controller 6 includes a second transistor T2, the gate of the second transistor T2 is coupled to the second sampling control terminal Gate2, the first electrode of the second transistor T2 is coupled to the first electrode of the first photosensitive collector 3, and the second electrode of the second transistor T2 is coupled to the first electrode of the second photosensitive collector 4.

[0058] Still combined Figure 4As shown, the first optical path selection controller 5 includes a first transistor T1, and the gate of the first transistor T1 is coupled to the first sampling control terminal Gate1. In this way, under the control of the control signal loaded by the first sampling control terminal Gate1, the on and off control of the first transistor T1 can be realized; the first electrode of the first transistor T1 is coupled to the signal output terminal Read, and the second electrode of the first transistor T1 is coupled to the first electrode of the first photosensitive collector 3; when the first transistor T1 is turned on and the first photosensitive collector 3 collects texture data, the corresponding texture sensing unit 2 can read the texture data collected by the first photosensitive collector 3 through the signal output terminal Read, so as to realize the subsequent texture recognition function. In the specific implementation process, the EQE of the first photosensitive collector 3 can be smaller than the EQE of the second photosensitive collector 4. For example, in addition to the same P-layer and N-layer related structural parameters, the thickness of the I layer of the first photosensitive collector 3 is smaller than the thickness of the I layer of the second photosensitive collector 4, so that the EQE of the first photosensitive collector 3 is smaller than the EQE of the second photosensitive collector 4. If the current texture sensing unit 2 is in strong light, the first transistor T1 can be controlled to be turned on by loading a corresponding control signal to the first sampling control terminal Gate1, thereby achieving texture collection under the premise of avoiding saturation of the first photosensitive collector 3, thereby ensuring the accuracy of texture recognition under strong light.

[0059] Still combined Figure 4 As shown, the second optical path selection controller 6 includes a second transistor T2, the gate of which is coupled to the second sampling control terminal Gate2, so that under the control of the control signal loaded on the second sampling control terminal Gate2, the on and off control of the second transistor T2 can be realized; the first electrode of the second transistor T2 is coupled to the first electrode of the first photosensitive collector 3, and the second electrode of the second transistor T2 is coupled to the first electrode of the second photosensitive collector 4. When the first transistor T1 is turned on and the second transistor T2 is turned on, the first photosensitive collector 3 and the second photosensitive collector 4 can both collect texture data, and the corresponding texture sensing unit 2 can read out the texture data collected by the two through the signal output terminal Read, so as to realize the subsequent texture recognition function. In the specific implementation process, if the current texture sensing unit 2 is in weak light, the first sampling control terminal Gate1 and the second sampling control terminal Gate2 can be loaded with the same frequency pulse signal to control the synchronous switching of the first transistor T1 and the second transistor T2, thereby ensuring that the texture collection in weak light has a higher photocurrent, ensuring the photoelectric conversion efficiency, and ensuring the texture recognition accuracy in weak light.

[0060] It should be noted that the first transistor T1 and the second transistor T2 can be thin film transistors or metal oxide semiconductor field effect transistors (MOS), which are not limited here. The first transistor T1 and the second transistor T2 can be N-type transistors or P-type transistors, which are not limited here. The first electrode and the second electrode of the first transistor T1 can have interchangeable functions according to the type of the first transistor T1 and the signal at the signal end; for example, the first electrode can be the source and the corresponding second electrode can be the drain; for another example, the first electrode can be the drain and the corresponding second electrode can be the source, which is not limited here. Similarly, the first electrode and the second electrode of the second transistor T2 can be set accordingly according to their types and the signals at the signal end, which are not described in detail here.

[0061] In the embodiment of the present invention, Figure 5 Shown along Figure 2 Specifically, along the direction away from the substrate, the first photosensitive collector 3 and the second photosensitive collector 4 are stacked in sequence. Figure 5 In the direction indicated by the arrow X, the first photosensitive collector 3 and the second photosensitive collector 4 are stacked in sequence along the direction indicated by the arrow X, thereby avoiding the first photosensitive collector 3 and the second photosensitive collector 4 from occupying a large space area and reducing the production cost.

[0062] In the embodiment of the present invention, the area of ​​the light-sensitive region of the second light-sensitive collector 4 is smaller than the area of ​​the light-sensitive region of the first light-sensitive collector 3. Figure 5 As shown, the area of ​​the photosensitive region of the second photosensitive collector 4 is smaller than the area of ​​the photosensitive region of the first photosensitive collector 3. In this way, after the first photosensitive collector 3 is manufactured, the flatness of the film layer related to the subsequent manufacturing of the second photosensitive collector 4 can be guaranteed. If the second photosensitive collector 4 is not flat, the dark state current will be significantly increased, and the signal-to-noise ratio of texture recognition will be reduced, thereby ensuring the texture recognition accuracy of the second photosensitive collector.

[0063] In the embodiment of the present invention, the second electrode of the first photosensitive collector 3 is coupled to the second electrode of the second photosensitive collector 4 and shares the same electrode, and the electrode is coupled to the reverse bias voltage terminal VBias. Figure 5As shown, the first photosensitive collector 3 includes a first N-layer structure, a first I-layer structure and a first P-layer structure which are sequentially away from the substrate substrate, and the second photosensitive collector 4 includes a second P-layer structure, a second I-layer structure and a second N-layer structure which are sequentially away from the substrate substrate. The first photosensitive collector 3 and the second photosensitive collector 4 share an electrode between the first P-layer structure and the second P-layer structure, and the electrode is coupled to the reverse bias voltage terminal VBias. The voltage loaded on the reverse bias voltage terminal VBias can be any value between -3V and -8V. Of course, the voltage loaded on the reverse bias voltage terminal VBias can also be set according to the actual needs of texture collection, which is not limited here. In this way, there is no need to set electrodes separately for the first photosensitive collector 3 and the second photosensitive collector 4 in the texture sensing unit 2, thereby reducing the manufacturing cost while ensuring texture collection.

[0064] In the embodiment of the present invention, the first optical path selection controller 5 and the second optical path selection controller 6 are arranged between the substrate and the first photosensitive collector 3. Figure 5 As shown, the first optical path selection controller 5 and the second optical path selection controller 6 are arranged between the substrate and the first photosensitive collector 3. In this way, while ensuring that the first optical path selection controller 5 and the second optical path selection controller 6 control the first photosensitive collector 3 and the second photosensitive collector 4, the first photosensitive collector 3 is guaranteed to effectively collect texture data.

[0065] In the specific implementation process, while combining the texture recognition function with the display function, at least part of the film layers in the first optical path selection controller 5 and the second optical path selection controller 6 can be made in the same layer as the film layers related to the display function, so as to ensure that the texture recognition substrate has the texture recognition function while also having the display function. At this time, the texture recognition substrate can include a plurality of sub-pixels arranged in an array, and at least one texture sensing unit 2 is arranged in the light-transmitting area between two adjacent sub-pixels. The texture recognition substrate can include a light-emitting functional layer and a driving circuit layer. While making the driving circuit layer located in the display area, the first optical path selection controller 5 and the second optical path selection controller 6 can be made in the same layer, thereby simplifying the manufacturing process and reducing the manufacturing cost. Among them, the light-emitting functional layer can include an anode, a pixel defining layer, an organic light-emitting layer and a cathode, and the driving circuit layer can include transistors and storage capacitors that constitute a pixel driving circuit. For the relevant film layers of the light-emitting functional layer and the driving circuit layer, reference can be made to the description in the relevant technology, which will not be described in detail here.

[0066] In the specific implementation process, Figure 5As shown, the first optical path selection controller 5 may include: a buffer layer (Buffer) arranged on a substrate, an active layer (P-Si) arranged on the buffer layer (Buffer), a gate insulating layer (GI) covering the active layer (P-Si), a gate electrode (Gate) arranged on the gate insulating layer (GI), an interlayer insulating layer (ILD) covering the gate electrode (Gate), a via hole being opened on the interlayer insulating layer (ILD), the via hole exposing the active layer (P-Si), a first source electrode and a first gate electrode arranged on the interlayer insulating layer A drain electrode (SD1), a first source electrode and a first drain electrode are respectively connected to the active layer (P-Si) through vias, and sequentially cover the first passivation layer (PVX1), the first flat layer (PLN1) and the second passivation layer (PVX2) of the aforementioned structure. Vias are provided on the first passivation layer (PVX1), the first flat layer (PLN1) and the second passivation layer (PVX2), and the vias expose the first drain electrode (SD1). The second source-drain electrode (SD2) arranged on the second passivation layer (PVX2) is connected to the first drain electrode (SD1) through the vias.

[0067] In addition, the relevant film layers of the second optical path selection controller 6 are the same as those of the first optical path selection controller 5, and will not be described in detail. Figure 5 As shown. Among them, the buffer layer (Buffer), the gate insulating layer (GI), the interlayer insulating layer (ILD), the first passivation layer (PVX1) and the second passivation layer (PVX2) can be made of any one or more of silicon oxide (SiOx), silicon nitride (SiNx) and silicon oxynitride (SiON), and can be a single layer, a multilayer or a composite layer. The active layer film can be made of amorphous indium gallium zinc oxide material (a-IGZO), zinc oxynitride (ZnON), indium zinc tin oxide (IZTO), amorphous silicon (a-Si), polycrystalline silicon (p-Si), sexithiophene or polythiophene and other materials, that is, the embodiment of the present invention is applicable to transistors manufactured based on oxide technology, silicon technology or organic technology.

[0068] It should be noted that the first photosensitive collector 3 can be manufactured on the side of the second source-drain electrode (SD2) away from the substrate in the order of N layer -> I layer -> P layer, and then the second electrode of the first photosensitive collector 3 is deposited; after the first photosensitive collector 3 and its second electrode are manufactured, a first protective layer covering the second electrode of the first photosensitive collector 3 can be provided, and the first protective layer effectively avoids damage to the first photosensitive collector 3 and the first optical path selection controller 5 and the second optical path selection controller 6 by subsequent processes; the first protective layer is located in the portion directly above the first photosensitive collector 3. A via hole is separately provided, through which the second pole of the first photosensitive collector 3 is exposed, and the orthographic projection area of ​​the via hole on the substrate can be slightly smaller than the photosensitive area of ​​the first photosensitive collector 3, so as to reserve space for the signal wiring of the reverse bias voltage terminal VBias coupled to the second pole of the first photosensitive collector 3; then, the second photosensitive collector 4 can be manufactured in the order of P layer -> I layer -> N layer on the side of the second pole of the first photosensitive collector 3 away from the substrate, and then, the first pole of the second photosensitive collector 4 is deposited on the side of the second photosensitive collector 4 away from the substrate;

[0069] After manufacturing the second photosensitive collector 4 and its first electrode, a second protective layer covering the first electrode of the second photosensitive collector 4 may be provided, and a via is provided in the portion of the second protective layer located directly above the second photosensitive collector 4, through which the first electrode of the second photosensitive collector 4 is exposed, so as to reserve space for the second electrode of the second optical path selection controller 6 later; the first protective layer and the second protective layer may be made of any one or more of silicon oxide (SiOx), silicon nitride (SiNx) and silicon oxynitride (SiON), and may be a single layer, a multilayer or a composite layer, and the first protective layer and the second protective layer form Figure 5the film layer identified by Cover in the figure; after the first pole of the second photosensor 4 is made, a second flat layer (PLN2) covering the first pole of the second photosensor 4 and an adhesion layer (PAS) covering the second flat layer can be provided; then, a signal line of a reverse bias voltage terminal VBias is provided on the side of the adhesion layer (PAS) away from the substrate, and the signal line is coupled to the second pole of the first photosensor through a via penetrating the relevant film layer, and the structural stability between the signal line and the second flat layer (PLN2) is ensured by the adhesion layer (PAS); a shading layer (LS) is also provided between the buffer layer (Buffer) and the substrate, and the shading layer (LS) can be made of a metal layer such as molybdenum, and the positive projection of the active layer on the substrate completely falls within the area of ​​the positive projection of the shading layer (LS) on the substrate, and the interference of the external ambient light on the first optical path selection controller 5 and the second optical path selector is effectively avoided by the shading layer (LS), thereby ensuring the performance of the texture recognition substrate. In addition, other structures in the texture recognition substrate can refer to the design in the relevant technology and will not be described in detail here.

[0070] Based on the same inventive concept, Figure 6 As shown, an embodiment of the present invention further provides a texture recognition device, which includes the texture recognition substrate 10 as described above; the principle of solving the problem by the texture recognition device is similar to that of the aforementioned texture recognition substrate 10, so the implementation of the texture recognition device can refer to the implementation of the aforementioned texture recognition substrate 10, and the repeated parts will not be repeated.

[0071] In the specific implementation process, the texture recognition device provided by the embodiment of the present invention can be a mobile phone, and can also be any product or component with a display function, such as a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, etc. Other essential components of the texture recognition device should be understood by ordinary technicians in the field, and will not be repeated here, nor should they be used as limitations of the present invention.

[0072] Based on the same inventive concept, Figure 7 As shown, an embodiment of the present invention further provides a driving method for a texture recognition substrate, the driving method comprising:

[0073] S101: If a first signal is received, turning on a first optical path selection controller and a second optical path selection controller to obtain first texture data collected by the first photosensitive collector and the second photosensitive collector;

[0074] S102: If the second signal is received, the first optical path selection controller is turned on to obtain second texture data collected by the first photosensitive collector.

[0075] In the specific implementation process, the specific structure of the texture recognition substrate in the driving method refers to the description of the aforementioned relevant parts, which will not be repeated here. The texture recognition substrate also includes a control driving chip coupled to the signal output terminal Read of each texture sensing unit 2. On the one hand, the control driving chip can realize the control of the conduction and cutoff of the first optical path selection controller 5 and the second optical path selection controller 6, thereby realizing the control of the collection of texture data of the first photosensitive collector 3 and the second photosensitive collector 4. On the other hand, the control driving chip can perform texture recognition based on the texture data collected by the texture sensing unit 2.

[0076] First, the texture sensing unit 2 receives a signal from the control driving chip, and then the texture sensing unit 2 controls the on and off of the first optical path selection controller 5 and the second optical path selection controller 6 according to the received signal; if the texture sensing unit 2 receives the first signal, the first optical path selection controller 5 and the second optical path selection controller 6 are turned on. For example, in weak light, the texture sensing unit 2 receives the first signal, turns on the first optical path selection controller 5 and the second optical path selection controller 6, so that the first texture data collected by the first photosensitive collector 3 and the second photosensitive collector 4 can be obtained, thereby ensuring the texture recognition accuracy in weak light; if the texture sensing unit 2 receives the second signal, the first optical path selection controller 5 is turned on, and the second texture data collected by the first photosensitive collector 3 is obtained. For example, in strong light, the texture sensing unit 2 receives the second signal, turns on the first optical path selection controller 5, and turns off the second optical path selection controller 6, thereby obtaining the second texture data collected by the first photosensitive collector 3, thereby avoiding the phenomenon of device saturation under strong light and ensuring the texture recognition accuracy under strong light. In addition, the texture sensing unit 2 can send the obtained texture data to the control driving chip, and the control driving chip can realize texture recognition according to the texture data. For the specific implementation of texture recognition, please refer to the description in the relevant technology and will not be described in detail here.

[0077] In the embodiment of the present invention, Figure 8 As shown, the method also includes:

[0078] S201: If it is determined that the current light intensity is greater than the preset light intensity, generating the second signal;

[0079] S202: If it is determined that the current light intensity is not greater than the preset light intensity, the first signal is generated.

[0080] In the specific implementation process, first, the numerical relationship between the light intensity of the current location of the texture recognition substrate and the preset light intensity is detected. The preset light intensity can be the light intensity set by technicians in this field according to the classification criteria of indoor scenes and outdoor scenes, which is not limited here. The intensity range of the ambient light intensity of the texture recognition substrate can be detected by a light sensor to determine the scene in which the texture recognition substrate is currently located. If it is determined that the light intensity of the current location of the texture recognition substrate is greater than the preset light intensity, a second signal is generated to achieve the conduction control of the first light path selection controller 5. If it is determined that the light intensity of the current location of the texture recognition substrate is not greater than the preset light intensity, a first signal is generated to achieve the conduction control of the first light path selection controller 5 and the second light path selection controller 6.

[0081] In addition, a signal for controlling the texture sensing unit 2 can be generated according to a manually set scene. For example, when the texture recognition substrate is manually set to be in a night scene, a first signal is generated to realize the conduction control of the first light path selection controller 5 and the second light path selection controller 6; for another example, when the texture recognition substrate is manually set to be in a daytime scene, a second signal is generated to realize the conduction control of the first light path selection controller 5. Of course, the specific implementation of generating the first signal and the second signal can also be set according to actual application needs, which will not be described in detail here.

[0082] In the embodiment of the present invention, Fig. 9 As shown, step S101: if a first signal is received, the first optical path selection controller and the second optical path selection controller are turned on to obtain first texture data collected by the first photosensitive collector and the second photosensitive collector, including:

[0083] S301: if a first signal is received, a pulse signal with the same frequency is applied to the first sampling control end and the second sampling control end;

[0084] S302: Under the control of the same-frequency pulse signal, the first optical path selection controller and the second optical path selection controller are turned on to obtain first texture data collected by the first photosensitive collector and the second photosensitive collector.

[0085] In the specific implementation process, the specific implementation process of step S301 to step S302 is as follows:

[0086] First, if the first signal is received, the control driving chip can load the same-frequency pulse signal to the first sampling control terminal Gate1 and the second sampling control terminal Gate2, so as to realize the control of the synchronous switch of the first optical path selection controller 5 and the second optical path selection controller 6; under the control of the same-frequency pulse signal, the first optical path selection controller 5 and the second optical path selection controller 6 are turned on to obtain the first texture data collected by the first photosensitive collector 3 and the second photosensitive collector 4. In other words, when the first optical path selection controller 5 and the second optical path selection controller 6 are both turned on, the first texture data collected by the first photosensitive collector 3 and the second photosensitive collector 4 can be obtained.

[0087] In the embodiment of the present invention, Fig.10 As shown, step S102: if the second signal is received, the first optical path selection controller is turned on to obtain the second texture data collected by the first photosensitive collector, including:

[0088] S401: if a second signal is received, then the first control signal is applied to the first sampling control terminal, and the second control signal is applied to the second sampling control terminal;

[0089] S402: under the control of the first control signal, turning on the first optical path selection controller;

[0090] S403: Under the control of the second control signal, disconnect the second optical path selector to obtain second texture data collected by the first photosensor.

[0091] In the specific implementation process, the specific implementation process of step S401 to step S403 is as follows:

[0092] First, if the second signal is received, the control driving chip can load the first control signal to the first sampling control terminal Gate1, and under the control of the first control signal, turn on the first optical path selection controller 5, and the control driving chip can load the second control signal to the second sampling control terminal, and under the control of the second control signal, disconnect the second optical path selection controller 6. At this time, only the second texture data collected by the first photosensitive collector 3 can be obtained. For example, if the first optical path selection controller 5 and the second optical path selection controller 6 are both P-type transistors, the first control signal can be a low-level signal, and the second control signal can be a high-level signal; for another example, if the first optical path selection controller 5 and the second optical path selection controller 6 are both N-type transistors, the first control signal can be a high-level signal, and the second control signal can be a low-level signal. Of course, those skilled in the art can also set the first control signal and the second control signal according to the transistor type of the first optical path selection controller 5 and the second optical path selection controller 6, which is not limited here.

[0093] The embodiment of the present invention provides a texture recognition substrate, a driving method and a device thereof, wherein the texture recognition substrate comprises a substrate substrate and a plurality of texture sensing units 2 arranged in an array on the substrate substrate 1, each texture sensing unit 2 comprises a first photosensitive collector 3, a second photosensitive collector 4, a first optical path selection controller 5 and a second optical path selection controller 6, the first optical path selection controller 5 is coupled in series with the first photosensitive collector 3 under the control of a first sampling control terminal Gate1, and the second optical path selection controller 6 is connected to the second sampling control terminal G Under the control of ate2, the second photosensitive collector 4 is coupled in series, and the circuit after series coupling is coupled in parallel with the first photosensitive collector 3; in this way, under strong light, the first photosensitive collector 3 can be controlled to collect texture data. If the first photosensitive collector 3 with a smaller EQE is used, the saturation phenomenon of the texture sensing unit 2 under strong light is avoided; under weak light, the first photosensitive collector 3 and the second photosensitive collector 4 can be controlled to collect texture data at the same time, thereby improving the photocurrent under weak light and ensuring the photoelectric conversion efficiency of the texture sensing unit 2 under weak light. In this way, the fingerprint recognition accuracy under strong light and weak light is taken into account at the same time.

[0094] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0095] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A texture recognition substrate, characterized in that: include: A base substrate and a plurality of texture sensing units arranged in an array on the base substrate; Each of the texture sensing units includes a first photosensitive collector, a second photosensitive collector, a first light path selection controller and a second light path selection controller; Wherein, the first optical path selection controller is coupled in series with the first photosensitive collector under the control of the first sampling control terminal; The second optical path selection controller is coupled in series with the second photosensitive collector under the control of the second sampling control terminal, and the serially coupled circuit is coupled in parallel with the first photosensitive collector; Among them, along the direction away from the substrate, the first photosensitive collector and the second photosensitive collector are stacked in sequence; in a weak light environment, the first light path selection controller is controlled to be turned on by the first sampling control end, and the second light path selection controller is controlled to be turned on by the second sampling control end, and the texture data is collected by the first photosensitive collector and the second photosensitive collector at the same time; in a strong light environment, the first light path selection controller is controlled to be turned on by the first sampling control end, and the second light path selection controller is controlled to be cut off by the second sampling control end, and the texture data is collected only by the first photosensitive collector.

2. The texture recognition substrate according to claim 1, characterized in that: The first optical path selection controller includes a first transistor, a gate of the first transistor is coupled to the first sampling control terminal, a first electrode of the first transistor is coupled to the signal output terminal, and a second electrode of the first transistor is coupled to the first electrode of the first photosensitive collector; The second optical path selection controller includes a second transistor, a gate of the second transistor is coupled to the second sampling control terminal, a first electrode of the second transistor is coupled to the first electrode of the first photosensitive collector, and a second electrode of the second transistor is coupled to the first electrode of the second photosensitive collector.

3. The texture recognition substrate according to claim 1, characterized in that: The area of ​​the light-sensitive region of the second light-sensitive collector is smaller than the area of ​​the light-sensitive region of the first light-sensitive collector.

4. The texture recognition substrate according to any one of claims 1 to 3, characterized in that: The second electrode of the first photosensitive collector is coupled to the second electrode of the second photosensitive collector and shares a same electrode, and the electrode is coupled to a reverse bias voltage terminal.

5. The texture recognition substrate according to claim 4, characterized in that: The first optical path selection controller and the second optical path selection controller are arranged between the substrate and the first photosensitive collector.

6. A texture recognition device, characterized in that: include: A texture recognition substrate as described in any one of claims 1 to 5.

7. A driving method for a texture recognition substrate according to any one of claims 1 to 5, characterized in that: include: If the first signal is received, the first optical path selection controller and the second optical path selection controller are turned on to obtain the first texture data collected by the first photosensitive collector and the second photosensitive collector; If the second signal is received, the first optical path selection controller is turned on to obtain the second texture data collected by the first photosensitive collector.

8. The driving method according to claim 7, characterized in that: The method further comprises: If it is determined that the current light intensity is greater than the preset light intensity, generating the second signal; If it is determined that the current light intensity is not greater than the preset light intensity, the first signal is generated.

9. The driving method according to claim 7, characterized in that: If the first signal is received, the first optical path selection controller and the second optical path selection controller are turned on to obtain the first texture data collected by the first photosensitive collector and the second photosensitive collector, including: If the first signal is received, a pulse signal with the same frequency is loaded to the first sampling control end and the second sampling control end; Under the control of the same-frequency pulse signal, the first optical path selection controller and the second optical path selection controller are turned on to obtain the first texture data collected by the first photosensitive collector and the second photosensitive collector.

10. The driving method according to claim 7, characterized in that: If the second signal is received, the first optical path selection controller is turned on to obtain the second texture data collected by the first photosensitive collector, including: If a second signal is received, the first control signal is applied to the first sampling control terminal, and the second control signal is applied to the second sampling control terminal; Under the control of the first control signal, turning on the first optical path selection controller; Under the control of the second control signal, the second optical path selection controller is disconnected to obtain the second texture data collected by the first photosensitive collector.

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