A fingerprint recognition panel and control method thereof, and a fingerprint recognition device

Abstract

A fingerprint recognition panel and a control method thereof, and a fingerprint recognition device, the fingerprint recognition panel comprising: a display component, a control component, and a transmittance adjustment component and a fingerprint recognition component arranged on the backlight side of the display component, the transmittance adjustment component being arranged on the side of the fingerprint recognition component close to the display component, and the working states of the fingerprint recognition panel comprising: a display stage and a fingerprint recognition stage; in the display stage, the display component is used to emit a first light to display an image to be displayed; the transmittance adjustment component is used to receive ambient light transmitted by the display component; the control component is connected to the transmittance adjustment component and is used to control the transmittance of the transmittance adjustment component so that the transmittance of the transmittance adjustment component is less than a threshold transmittance. The technical solution provided by the present application improves the accuracy of the formed fingerprint image and the fingerprint recognition accuracy.

Description

Technical Field

[0001] The present invention relates to the field of fingerprint recognition technology, and in particular to a fingerprint recognition panel and a control method thereof, and a fingerprint recognition device. Background Art

[0002] Fingerprint recognition refers to the process of identifying someone by comparing the detailed feature points of different fingerprints. Since everyone's fingerprint is different, fingerprints can be used for identity verification. Thanks to the breaking of the production capacity barrier of organic light-emitting diodes (OLEDs), the maturity of technology, and the foreseeable cost reduction, optical fingerprint recognition technology has officially become one of the most important means of fingerprint recognition.

[0003] Optical fingerprint recognition technology usually places the optical fingerprint recognition module on one side of the entire OLED display substrate. The light emitted by the OLED display substrate is reflected by the fingerprint and then transmitted through the entire OLED display substrate to reach the optical fingerprint recognition module. The optical fingerprint recognition module forms a fingerprint image based on the received light to identify the fingerprint.

[0004] In the related art, the optical fingerprint recognition module adopts a PIN photodiode. Before fingerprint recognition, the PIN photodiode will inevitably absorb the ambient light transmitted through the OLED display substrate or the light emitted by the OLED display substrate. Due to the performance defects of the PIN photodiode material, the charge converted by the PIN photodiode cannot be quickly transmitted in full, resulting in partial charge remaining in the PIN photodiode during the fingerprint recognition process, and then producing a bright spot residual phenomenon, resulting in low accuracy of the fingerprint image and reducing the fingerprint recognition accuracy. Summary of the invention

[0005] The present application provides a fingerprint recognition panel and a control method thereof, and a fingerprint recognition device, which can improve the accuracy of a formed fingerprint image and improve the fingerprint recognition precision.

[0006] In a first aspect, the present application provides a fingerprint recognition panel, comprising: a display component, a control component, and a transmittance adjustment component and a fingerprint recognition component arranged on the backlight side of the display component, wherein the transmittance adjustment component is arranged on a side of the fingerprint recognition component close to the display component, and the working states of the fingerprint recognition panel include: a display stage and a fingerprint recognition stage; in the display stage,

[0007] The display component is used to emit a first light to display an image to be displayed;

[0008] The transmittance adjustment component is used to receive the ambient light transmitted by the display component;

[0009] The control component is connected to the transmittance adjusting component and is used to control the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is less than a threshold transmittance.

[0010] Optionally, during the fingerprint recognition phase,

[0011] The display component is further used to emit a second light to the fingerprint to be tested;

[0012] The transmittance adjustment component is further used to receive the second light reflected by the fingerprint to be detected;

[0013] The control component is further used to control the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is greater than the threshold transmittance;

[0014] The fingerprint recognition component is used to receive the light transmitted by the transmittance adjustment component and obtain a fingerprint image according to the light transmitted by the transmittance adjustment component to recognize the fingerprint.

[0015] Optionally, the control component is used to generate a first control signal in the display stage, and control the transmittance of the transmittance adjusting component according to the first control signal, so that the transmittance of the transmittance adjusting component is less than a threshold transmittance, and is also used to generate a second control signal in the fingerprint recognition stage, and control the transmittance of the transmittance adjusting component according to the second control signal, so that the transmittance of the transmittance adjusting component is greater than the threshold transmittance.

[0016] Optionally, the fingerprint recognition component includes: a substrate and a plurality of photoelectric sensors arranged on the substrate;

[0017] The plurality of photosensors are disposed on a side of the substrate close to the display assembly.

[0018] Optionally, the display component comprises: a plurality of point light sources, the plurality of point light sources emit light sequentially during the fingerprint recognition stage;

[0019] The transmittance adjustment component comprises: a plurality of transmittance adjustment structures, each of which corresponds to each of the point light sources;

[0020] The orthographic projection of the transmittance adjusting structure on the display component covers the orthographic projection of the point light source corresponding to the transmittance adjusting structure on the display component;

[0021] The control assembly is connected to each transmittance adjusting structure respectively, and is used to control the transmittance of each transmittance adjusting structure.

[0022] Optionally, each transmittance adjustment structure includes: a first electrode and a second electrode and a transmittance adjustment layer arranged between the first electrode and the second electrode;

[0023] The control component is connected to the first electrode and the second electrode respectively, and is specifically used to provide an electric signal to the first electrode and the second electrode according to a first control signal in a display stage, and form a first electric field between the first electrode and the second electrode, so that the transmittance of the transmittance adjustment layer is less than a threshold transmittance under the action of the first electric field, and is also used to provide an electric signal to the first electrode and the second electrode according to a second control signal in a fingerprint recognition stage, and form a second electric field between the first electrode and the second electrode, so that the transmittance of the transmittance adjustment layer is greater than the threshold transmittance under the action of the second electric field;

[0024] The first electrode and the second electrode are transmissive electrodes.

[0025] Optionally, the first electrodes of adjacent transmittance adjusting structures are separately arranged, and the second electrodes of adjacent transmittance adjusting structures are separately arranged;

[0026] The i-th point light source corresponds to the i-th transmittance adjustment structure. When the i-th point light source is emitting light, the control component is used to control the transmittance of the i-th transmittance adjustment structure to be a first transmittance during the fingerprint recognition stage, and to control the transmittance of all other transmittance adjustment structures except the i-th transmittance adjustment structure to be a second transmittance according to a second control signal, wherein the first transmittance is less than or greater than the second transmittance.

[0027] Optionally, the first electrodes of adjacent transmittance adjusting structures are connected to each other, and the second electrodes of adjacent transmittance adjusting structures are connected to each other.

[0028] Optionally, the transmittance adjustment layer includes: a holographic polymer dispersed liquid crystal Bragg volume grating or a cholesteric liquid crystal.

[0029] Optionally, the light transmittance adjustment layer is a color-changing layer;

[0030] The materials for making the color-changing layer include: polyaniline, viologen, tungsten trioxide, polythiophene and its derivatives, viologen compounds, tetrathiafulvalene, and metal phthalocyanine compounds.

[0031] Optionally, the fingerprint recognition panel further includes: a collimation layer;

[0032] The collimating layer is arranged on a side of the light transmittance adjusting component close to the display component, and is used to filter the incident light so that the light with a scattering angle within a preset range passes through the collimating layer;

[0033] The incident light is the ambient light transmitted by the display component in the display stage, and is the second light reflected by the fingerprint to be detected in the fingerprint recognition stage.

[0034] Optionally, the display component includes: an organic light emitting diode display substrate.

[0035] In a second aspect, the present application also provides a fingerprint recognition device, including: the above-mentioned fingerprint recognition panel.

[0036] In a third aspect, the present application further provides a method for controlling a fingerprint recognition panel, which is applied to the above-mentioned fingerprint recognition panel. The method comprises: in a display stage,

[0037] emitting a first light to display an image to be displayed;

[0038] receiving ambient light transmitted by the display component;

[0039] The transmittance of the transmittance adjusting component is controlled so that the transmittance of the transmittance adjusting component is less than a threshold transmittance.

[0040] Optionally, the method further comprises: in the fingerprint recognition stage,

[0041] emitting a second light beam toward the fingerprint to be tested;

[0042] Receiving a second light reflected by the fingerprint to be detected;

[0043] Controlling the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is greater than the threshold transmittance;

[0044] The light transmitted by the transmittance adjusting component is received, and a fingerprint image is obtained according to the light transmitted by the transmittance adjusting component to identify the fingerprint.

[0045] The present application provides a fingerprint recognition panel and a control method thereof, and a fingerprint recognition device, wherein the fingerprint recognition panel includes: a display component, a control component, and a transmittance adjustment component and a fingerprint recognition component arranged on the backlight side of the display component, wherein the transmittance adjustment component is arranged on the side of the fingerprint recognition component close to the display component, and the working state of the fingerprint recognition panel includes: a display stage and a fingerprint recognition stage; in the display stage, the display component is used to emit a first light to display an image to be displayed; the transmittance adjustment component is used to receive ambient light transmitted by the display component; the control component is connected to the transmittance adjustment component and is used to control the transmittance of the transmittance adjustment component so that the transmittance of the transmittance adjustment component is less than a threshold transmittance. The present application controls the transmittance of the transmittance adjustment component through the control component, so that before fingerprint recognition, the ambient light transmitted by the display component cannot be projected into the fingerprint recognition component, thereby avoiding the residual partial charge in the fingerprint recognition component during the fingerprint recognition process, thereby improving the accuracy of the formed fingerprint image and the fingerprint recognition accuracy.

[0046] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0048] Figure 1 A schematic diagram of the structure of a fingerprint recognition panel provided in an embodiment of the present application;

[0049] Figure 2 A light path diagram of the fingerprint recognition panel provided in an embodiment of the present application during the display stage;

[0050] Figure 3 An optical path diagram of the fingerprint recognition panel provided in an embodiment of the present application during the fingerprint recognition stage;

[0051] Figure 4 Another schematic diagram of the structure of the fingerprint recognition panel provided in the embodiment of the present application;

[0052] Figure 5 Another structural schematic diagram of a fingerprint recognition panel provided in an embodiment of the present application;

[0053] Figure 6 A schematic diagram of the structure of the light transmittance adjustment structure provided in an embodiment of the present application;

[0054] Figure 7A working timing diagram of the fingerprint recognition panel provided in the embodiment of the present application;

[0055] Figure 8 Another working timing diagram of the fingerprint recognition panel provided in the embodiment of the present application;

[0056] Fig. 9A A first state diagram of the light transmittance adjustment layer provided in an embodiment of the present application;

[0057] Fig. 9B A second state diagram of the light transmittance adjustment layer provided in an embodiment of the present application;

[0058] Fig.10 A further structural schematic diagram of a fingerprint recognition panel provided in an embodiment of the present application;

[0059] Fig.11 A flow chart of the control method of the fingerprint recognition panel provided in the embodiment of the present application in the display stage;

[0060] Fig.12 This is a flow chart of the fingerprint recognition stage of the control method of the fingerprint recognition panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0062] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0063] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0064] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0065] Some embodiments of the present application provide a fingerprint recognition panel. Figure 1 A schematic diagram of the structure of a fingerprint recognition panel provided in an embodiment of the present application, Figure 2 The optical path diagram of the fingerprint recognition panel provided in the embodiment of the present application during the display stage is as follows: Figure 1 and Figure 2 As shown, the fingerprint recognition panel provided in the embodiment of the present application includes: a display component 10, a transmittance adjustment component 20, a fingerprint recognition component 30 and a control component 40, wherein the transmittance adjustment component 20 and the fingerprint recognition component 30 are arranged on the backlight side of the display component 10, and the working states of the fingerprint recognition panel include: a display stage and a fingerprint recognition stage.

[0066] Specifically, in the display stage, the display component 10 is used to emit a first light to display an image to be displayed; the transmittance adjustment component 20 is used to receive ambient light transmitted by the display component 10; the control component 40 is connected to the transmittance adjustment component 20, and is used to control the transmittance of the transmittance adjustment component 20 so that the transmittance of the transmittance adjustment component 20 is less than a threshold transmittance.

[0067] In this embodiment, during the display stage, the fingerprint recognition panel is only used for display and cannot be used for fingerprint recognition. During the fingerprint recognition stage, the fingerprint recognition panel is only used for fingerprint recognition and cannot be used for display. When the fingerprint to be tested touches the recognition area in the fingerprint recognition panel, the fingerprint recognition panel generates a touch trigger signal. After a display stage, it enters the fingerprint recognition stage.

[0068] Optionally, the specific value of the threshold transmittance is determined according to actual conditions, and the embodiments of the present application do not impose any limitation on this.

[0069] Optionally, the control component 40 can be implemented by a processor that performs logical operations, such as a central processing unit (CPU), a field programmable gate array (FPGA), a digital signal processor (DSP), a microcontroller unit (MCU), an application specific integrated circuit (ASIC), and other devices with data processing capabilities and / or program execution capabilities. It is easy to understand that the processing device may include a memory that is communicatively connected to the processor, and any combination of one or more computer program products is stored on the memory. The memory may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, an erasable programmable read-only memory (EPROM), a universal serial bus (USB) memory, a flash memory, etc. One or more computer instructions may be stored in the memory, and the processor may execute the computer instructions to implement the analysis function of the analysis module. Various applications and various data, such as various data used and / or generated by the application, may also be stored in the computer-readable storage medium.

[0070] In this embodiment, the connection between the control component 40 and the transmittance adjustment component 20 represents a communication connection. Specifically, the communication connection includes connection through a wireless network, a wired network, and / or any combination of a wireless network and a wired network. The network may include a local area network, the Internet, a telecommunication network, an Internet of Things based on the Internet and / or a telecommunication network, and / or any combination of the above networks. The wired network may, for example, use a wire, a twisted pair, a coaxial cable or an optical fiber transmission method to transmit information, and the wireless network may, for example, use a WWAN mobile communication network, Bluetooth, Zigbee or WiFi communication method.

[0071] In this embodiment, the transmittance of the transmittance adjusting component 20 in the present application is less than the threshold transmittance, which can reduce the amount of light entering the fingerprint recognition component during the display stage, thereby ensuring that there is no residual charge during the fingerprint recognition stage.

[0072] A fingerprint recognition panel provided by an embodiment of the present application includes: a display component, a control component, and a transmittance adjustment component and a fingerprint recognition component arranged on the backlight side of the display component. The transmittance adjustment component is arranged on the side of the fingerprint recognition component close to the display component. The working state of the fingerprint recognition panel includes: a display stage and a fingerprint recognition stage. In the display stage, the display component is used to emit a first light to display an image to be displayed; the transmittance adjustment component is used to receive ambient light transmitted by the display component; the control component is connected to the transmittance adjustment component and is used to control the transmittance of the transmittance adjustment component so that the transmittance of the transmittance adjustment component is less than a threshold transmittance. The present application controls the transmittance of the transmittance adjustment component through the control component, so that before fingerprint recognition, the ambient light transmitted by the display component cannot be projected into the fingerprint recognition component, thereby avoiding the residual partial charge in the fingerprint recognition component during the fingerprint recognition process, thereby improving the accuracy of the formed fingerprint image and the fingerprint recognition accuracy.

[0073] Optionally, Figure 3 The optical path diagram of the fingerprint recognition panel provided in the embodiment of the present application during the fingerprint recognition stage is as follows: Figure 1 and Figure 3 As shown, in the fingerprint recognition stage, the display component 10 in the embodiment of the present application is also used to emit a second light to the fingerprint to be tested; the transmittance adjustment component 20 is also used to receive the second light reflected by the fingerprint to be tested; the control component 40 is also used to control the transmittance of the transmittance adjustment component 20 so that the transmittance of the transmittance adjustment component 20 is greater than the threshold transmittance; the fingerprint recognition component 30 is used to receive the light transmitted by the transmittance adjustment component 20, and obtain a fingerprint image based on the light transmitted by the transmittance adjustment component 20 to identify the fingerprint.

[0074] Optionally, Figure 4Another structural schematic diagram of the fingerprint recognition panel provided in the embodiment of the present application is as follows Figure 4 As shown, the display component 10 in the embodiment of the present application can be an OLED display substrate, wherein the OLED display substrate includes: a driving backplane 11, a light-emitting element 12 arranged on the driving backplane 11, an encapsulation layer 13 arranged on the side of the light-emitting element 12 away from the driving backplane 11, and a cover plate 14 arranged on the side of the encapsulation layer 13 away from the driving backplane 11.

[0075] Specifically, in this embodiment, fingerprint recognition is implemented in the display area of ​​the OLED display substrate.

[0076] Specifically, the driving backplane 11 includes: a substrate, a thin film transistor disposed on the substrate, and a planar layer disposed on a side of the thin film transistor away from the substrate. Optionally, the thin film transistor may be a top gate structure or a bottom gate structure, which is not limited in any way in the embodiments of the present application. Figure 4 The top gate structure is taken as an example for explanation.

[0077] Specifically, the light emitting element 12 includes: a pixel defining layer, an anode, an organic light emitting layer and a cathode, wherein the anode is connected to the drain electrode of the thin film transistor.

[0078] Specifically, the encapsulation layer 13 is used to prevent water and oxygen from entering the organic light-emitting layer, thereby extending the life of the fingerprint recognition panel.

[0079] Optionally, the cover plate 14 may be a glass cover plate, or other cover plates, which is not limited in the embodiments of the present application.

[0080] It should also be noted that the display component may also include other structures, such as: a spacer 15 arranged between the pixel defining layer and the cathode, an optical adhesive 16 arranged between the encapsulation layer 13 and the cover plate 14, etc., but these are all reasonable alternative solutions to the embodiments of the present application, and therefore also fall within the scope of protection of the embodiments of the present application.

[0081] Alternatively, if Figure 4 As shown, the fingerprint recognition component 30 in the embodiment of the present application includes: a substrate 31 and a plurality of photoelectric sensors 32 arranged on the substrate 31.

[0082] Specifically, a plurality of photosensors 32 are disposed on a side of the substrate 31 close to the display assembly 10 .

[0083] Optionally, the substrate 31 may be a rigid substrate or a flexible substrate, wherein the rigid substrate may be but is not limited to one or more of glass and metal foil; the flexible substrate may be but is not limited to one or more of polyethylene terephthalate, polyethylene terephthalate, polyetheretherketone, polystyrene, polycarbonate, polyarylate, polyarylate, polyimide, polyvinyl chloride, polyethylene, and textile fiber.

[0084] Optionally, the photosensor 32 is a PIN photosensor.

[0085] Alternatively, if Figure 4 As shown, the fingerprint recognition component 30 in the embodiment of the present application is arranged on a side of the transmittance adjustment component 20 away from the display component 10 through an optical adhesive 50.

[0086] Optionally, the control component 40 is used to generate a first control signal in the display stage, and control the transmittance of the transmittance adjusting component according to the first control signal, so that the transmittance of the transmittance adjusting component is less than a threshold transmittance, and is also used to generate a second control signal in the fingerprint recognition stage, and control the transmittance of the transmittance adjusting component according to the second control signal, so that the transmittance of the transmittance adjusting component is greater than the threshold transmittance.

[0087] Optionally, Figure 5 Another structural schematic diagram of a fingerprint recognition panel provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the display component 10 provided in the embodiment of the present application includes: a plurality of point light sources DL, and the plurality of point light sources DL emit light in sequence during the fingerprint recognition stage. Specifically, each point light source is composed of at least one sub-pixel.

[0088] Optionally, the transmittance adjustment component includes: multiple transmittance adjustment structures 21, the transmittance adjustment structures 21 correspond one-to-one to the point light sources DL; the orthographic projection of the transmittance adjustment structure 21 on the display component 10 covers the orthographic projection of the point light source DL corresponding to the transmittance adjustment structure 21 on the display component 10.

[0089] Specifically, the control assembly is connected to each transmittance adjusting structure respectively, and is used to control the transmittance of each transmittance adjusting structure.

[0090] Optionally, Figure 6 A schematic diagram of the structure of the light transmittance adjustment structure provided in the embodiment of the present application is shown in FIG. Figure 6 As shown, each transmittance adjustment structure 21 includes: a first electrode 210 and a second electrode 220 and a transmittance adjustment layer 230 disposed between the first electrode 210 and the second electrode 220 .

[0091] Specifically, the control component 40 is connected to the first electrode 210 and the second electrode 220, respectively, and is specifically used to provide an electric signal to the first electrode 210 and the second electrode 220 according to a first control signal in the display stage, and form a first electric field between the first electrode and the second electrode, so that the transmittance of the transmittance adjustment layer is less than the threshold transmittance under the action of the first electric field. It is also used to provide an electric signal to the first electrode 210 and the second electrode 220 according to a second control signal in the fingerprint recognition stage, and form a second electric field between the first electrode 210 and the second electrode 220, so that the transmittance of the transmittance adjustment layer is greater than the threshold transmittance under the action of the second electric field.

[0092] Specifically, the first electrode 210 and the second electrode 220 are transmissive electrodes, and the materials used to make the first electrode 210 and the second electrode 220 are transparent conductive materials, wherein the transparent conductive material may be indium tin oxide, zinc tin oxide, etc., and the embodiment of the present application does not impose any limitation on this.

[0093] Optionally, in this embodiment, as an implementation method, the transmittance adjustment layer 230 includes: a liquid crystal layer; the liquid crystal layer includes: a holographic polymer dispersed liquid crystal Bragg volume grating or a cholesteric liquid crystal. At this time, the liquid crystal in the liquid crystal layer in the transmittance adjustment layer 230 is used to deflect under the action of the electric field between the first electrode 210 and the second electrode 220, and different electric fields correspond to different liquid crystal deflection angles, thereby changing the transmittance.

[0094] Specifically, in the display stage, the liquid crystal layer maintains low transmittance under the action of the first electric field; in the fingerprint recognition stage, the liquid crystal layer maintains high transmittance under the action of the second electric field, ensuring that the light reflected by the fingerprint to be tested can enter the fingerprint recognition component.

[0095] Optionally, in this embodiment, as another implementation, the transmittance adjustment layer 230 is a color-changing layer.

[0096] Optionally, the color-changing layer is made of an electrochromic material, which is divided into inorganic electrochromic materials and organic electrochromic materials. A typical representative of inorganic electrochromic materials is tungsten trioxide WO3, and organic electrochromic materials mainly include polythiophenes and their derivatives, viologens, viologens compounds, tetrathiafulvalene, metal phthalocyanine compounds or polyaniline.

[0097] Specifically, electrochromism is a phenomenon in which the optical properties of a material (reflectivity, transmittance, absorptivity, etc.) undergo stable and reversible color changes under the action of an external electric field, which is manifested in the form of reversible changes in color and transparency. Materials with electrochromic properties are called electrochromic materials.

[0098] Among them, polyaniline can be formed through electrochemical processes or chemical oxidation of aniline. If an electrode is immersed in a hydrochloric acid solution containing a low concentration of aniline, a polyaniline film will be produced on the electrode. Depending on the oxidation state, polyaniline can appear light yellow or dark green / black.

[0099] Specifically, in the display stage, the color-changing layer maintains a low transmittance under the action of the first electric field, and can absorb the ambient light transmitted through the display component and the light emitted by the display component itself; in the fingerprint recognition stage, the color-changing layer maintains a high transmittance under the action of the second electric field, ensuring that the light reflected by the fingerprint to be tested can enter the fingerprint recognition component.

[0100] In this embodiment, as a first implementation, the first electrodes of adjacent transmittance adjusting structures are connected to each other, and the second electrodes of adjacent transmittance adjusting structures are connected to each other, that is, no matter which point light source emits light, the transmittance of all transmittance adjusting structures is the same.

[0101] Figure 7 A working timing diagram of the fingerprint recognition panel provided in the embodiment of the present application, Figure 7 The working timing diagram provided is the working timing diagram corresponding to the first implementation mode. Figure 7 The following is an example of two point light sources. Figure 7 As shown, Touch is a touch trigger signal, L_DLi is a control signal for triggering the ith point light source to emit light, C_DLi is a control signal provided by the control component to the ith transmittance adjustment structure, G1~GN are control signals for triggering the fingerprint recognition component to recognize, wherein i is a positive integer less than or equal to 2, and the fingerprint recognition component includes: N rows and M columns of photoelectric sensors, Gi is used to trigger the ith row of photoelectric sensors to convert the optical signal into an electrical signal, such as Figure 7 As shown, in the fingerprint recognition panel provided in the embodiment of the present application, when the pressing of the designated area is detected, the fingerprint recognition panel generates a trigger signal, and then waits until the next display cycle to perform fingerprint recognition. The fingerprint recognition stage includes: the first stage T1 and the second stage T2. Specifically,

[0102] In the first stage T1, the control signal L_DL1 that the fingerprint recognition panel triggers the first point light source to emit light is at a valid level, the first point light source emits light, the control signal C_DL1 provided by the control component to the first transmittance adjustment structure and the control signal C_DL2 provided by the control component to the second transmittance adjustment structure are also at a valid level. At this time, the transmittances of the first transmittance adjustment structure and the second transmittance adjustment structure are both high transmittances. Then, the control signals G1~GN that trigger the fingerprint recognition component to recognize are successively at valid levels, and the fingerprint recognition component receives the transmittances of the first transmittance adjustment structure and the second transmittance adjustment structure to generate a first fingerprint image.

[0103] In the second stage T2, the control signal L_DL2 that the fingerprint recognition panel triggers the second point light source to emit light is at a valid level, the second point light source emits light, the control signal C_DL1 provided by the control component to the first transmittance adjustment structure and the control signal C_DL2 provided by the control component to the second transmittance adjustment structure are also at a valid level. At this time, the transmittances of the first transmittance adjustment structure and the second transmittance adjustment structure are both high transmittances, and then the control signals G1~GN that trigger the fingerprint recognition component to recognize are successively at valid levels, and the fingerprint recognition component receives the transmittances of the first transmittance adjustment structure and the second transmittance adjustment structure to generate a second fingerprint image.

[0104] Afterwards, the fingerprint recognition component splices the first fingerprint image and the second fingerprint image to form a fingerprint image to recognize the fingerprint.

[0105] Specifically, in this embodiment, during the fingerprint recognition stage, the control component provides the same control signal to all transmittance adjusting structures, and the transmittances of different transmittance adjusting structures are the same.

[0106] In addition, during the fingerprint recognition stage, since multiple point light sources emit light in sequence, the light emitted by one point light source will more or less affect the partial fingerprint image formed when the next point light source emits light, resulting in a bright spot afterimage phenomenon, which further reduces the fingerprint recognition accuracy.

[0107] To this end, in order to further improve the accuracy of fingerprint recognition, as a second implementation, the first electrodes of adjacent transmittance adjustment structures are separately set, and the second electrodes of adjacent transmittance adjustment structures are separately set, that is, in the fingerprint recognition stage, the transmittance of different transmittance adjustment structures can be different.

[0108] In this embodiment, the i-th point light source corresponds to the i-th transmittance adjustment structure. When the i-th point light source is emitting light, the control component 40 is used to control the transmittance of the i-th transmittance adjustment structure to be the first transmittance during the fingerprint recognition stage according to the second control signal, and to control the transmittance of all other transmittance adjustment structures except the i-th transmittance adjustment structure to be the second transmittance, and the first transmittance is less than or greater than the second transmittance.

[0109] Taking the first transmittance as low transmittance and the second transmittance as high transmittance as an example, when a point light source is lit, the transmittance adjusting component, under the control of the control component, makes the transmittance adjusting structure corresponding to the point light source have low transmittance, and other transmittance adjusting structures have high transmittance. When the next point light source is lit, the transmittance adjusting component, under the control of the control component, makes the transmittance adjusting structure corresponding to the point light source have low transmittance, and other transmittance adjusting structures have high transmittance. In this way, the technical problems of low accuracy of the fingerprint image and low fingerprint recognition accuracy caused by the point light sources lit in sequence during the fingerprint recognition process can be effectively avoided.

[0110] Figure 8 Another working timing diagram of the fingerprint recognition panel provided in the embodiment of the present application, Figure 8 The working timing diagram provided is the working timing diagram corresponding to the second implementation mode. Figure 8 The following is an example of two point light sources. Figure 8 As shown, Touch is a touch trigger signal, L_DLi is a control signal for triggering the ith point light source to emit light, C_DLi is a control signal provided by the control component to the ith transmittance adjustment structure, G1~GN are control signals for triggering the fingerprint recognition component to recognize, wherein i is a positive integer less than or equal to 2, and the fingerprint recognition component includes: N rows and M columns of photoelectric sensors, Gi is used to trigger the ith row of photoelectric sensors to convert the optical signal into an electrical signal, such as Figure 8 As shown, in the fingerprint recognition panel provided in the embodiment of the present application, when the pressing of the designated area is detected, the fingerprint recognition panel generates a trigger signal, and then waits until the next display cycle to perform fingerprint recognition. The fingerprint recognition stage includes: the first stage T1 and the second stage T2. Specifically,

[0111] In the first stage T1, the control signal L_DL1 that the fingerprint recognition panel triggers the first point light source to emit light is at a valid level, the first point light source emits light, the control signal C_DL1 provided by the control component to the first transmittance adjustment structure is at an invalid level, so that the transmittance of the first transmittance adjustment structure is low transmittance, the control signal C_DL2 provided by the control component to the second transmittance adjustment structure is at a valid level, so that the transmittance of the second transmittance adjustment structure is high transmittance, and then the control signals G1~GN that trigger the fingerprint recognition component to recognize are respectively at valid levels, and the fingerprint recognition component receives the transmittance of the first transmittance adjustment structure and the second transmittance adjustment structure to generate a first fingerprint image.

[0112] In the second stage T2, the control signal L_DL2 that the fingerprint recognition panel triggers the second point light source to emit light is at a valid level, the second point light source emits light, the control signal C_DL1 provided by the control component to the first transmittance adjustment structure is at a valid level, so that the transmittance of the first transmittance adjustment structure is high transmittance, and the control signal C_DL2 provided by the control component to the second transmittance adjustment structure is at an invalid level, so that the transmittance of the second transmittance adjustment structure is low transmittance, and then the control signals G1~GN that trigger the fingerprint recognition component to recognize are respectively at valid levels, and the fingerprint recognition component receives the transmittance of the first transmittance adjustment structure and the second transmittance adjustment structure to generate a second fingerprint image.

[0113] Afterwards, the fingerprint recognition component splices the first fingerprint image and the second fingerprint image to form a fingerprint image to recognize the fingerprint.

[0114] Specifically, in this embodiment, during the fingerprint recognition stage, the control component provides different control signals to all transmittance adjusting structures, so that the transmittances of different transmittance adjusting structures are the same.

[0115] Take the transmittance adjustment layer as a liquid crystal layer and two point light sources as an example. Fig. 9A This is a first state diagram of the transmittance adjustment layer provided in an embodiment of the present application, Fig. 9B The second state diagram of the transmittance adjustment layer provided in the embodiment of the present application is as follows: Fig. 9A As shown, at this time, when the control component does not provide an electrical signal to the transmittance adjusting layer according to the second control signal, when the liquid crystal in the transmittance adjusting layer is in the first state, the transmittance of the transmittance adjusting layer is low transmittance, such as Fig. 9B As shown, when the control component provides an electrical signal to the transmittance adjusting layer according to the second control signal, when the liquid crystal in the transmittance adjusting layer is in the second state, the transmittance of the transmittance adjusting layer is high transmittance.

[0116] Specifically, this embodiment can not only avoid the residual charge of the fingerprint recognition component caused by ambient light before fingerprint recognition, but also avoid the influence of the previous point light source on the partial fingerprint image formed when the next point light source is turned on during the fingerprint recognition process, thereby further improving the accuracy of the formed fingerprint image and the fingerprint recognition precision.

[0117] Optionally, Fig.10 Another structural diagram of a fingerprint recognition panel provided in an embodiment of the present application is shown in FIG. Fig.10 As shown, the fingerprint recognition panel provided in the embodiment of the present application further includes: a collimation layer 60 .

[0118] Specifically, the collimating layer 60 is disposed on a side of the transmittance adjusting component 20 close to the display component 10, and is used to filter the incident light so that the light with a scattering angle within a preset range passes through the collimating layer.

[0119] The incident light is the ambient light transmitted by the display component in the display stage, and is the second light reflected by the fingerprint to be detected in the fingerprint recognition stage.

[0120] Optionally, the collimating layer 60 may include: a lens, an optical fiber, etc., which is not limited in any way in the embodiment of the present application.

[0121] Optionally, the preset range is determined based on actual conditions, and the embodiments of the present application do not impose any limitation on this.

[0122] Since the collimating layer in the embodiment of the present application can filter the second light reflected by the fingerprint to be tested, so that the light with a scattering angle within a preset range is transmitted through the collimating layer, any photoelectric sensor can only receive the light reflected from the position opposite to it on the fingerprint to be tested, thereby avoiding the light reflected from other positions of the fingerprint to be tested from affecting the acquisition of the fingerprint image based on the received light. Therefore, the embodiment of the present application can improve the accuracy of the identified fingerprint image in the optical fingerprint recognition process.

[0123] Based on the same inventive concept, the present application also provides a method for controlling a fingerprint recognition panel, which is applied to the above-mentioned fingerprint recognition panel. Fig.11 The flowchart of the control method of the fingerprint recognition panel provided in the embodiment of the present application in the display stage is as follows: Fig.11 As shown, the flow chart of the control method of the fingerprint recognition panel provided by the embodiment of the present application, in the display stage, specifically includes the following steps:

[0124] Step S11, emitting a first light to display an image to be displayed.

[0125] Step S12: receiving ambient light transmitted by the display component.

[0126] Step S13: controlling the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is less than a threshold transmittance.

[0127] Among them, the fingerprint recognition panel is the fingerprint recognition panel provided in the aforementioned embodiment, and its implementation principle and implementation effect are similar, which will not be repeated here.

[0128] Optionally, Fig.12 The flowchart of the control method of the fingerprint recognition panel provided in the embodiment of the present application in the fingerprint recognition stage is as follows: Fig.12 As shown, in the fingerprint recognition stage, the control method of the fingerprint recognition panel provided by the embodiment of the present application specifically includes the following steps:

[0129] Step S21, emitting a second light beam toward the fingerprint to be detected.

[0130] Step S22, receiving the second light reflected by the fingerprint to be detected.

[0131] Step S23: controlling the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is greater than a threshold transmittance.

[0132] Step S24, receiving the light transmitted by the transmittance adjusting component, and obtaining a fingerprint image according to the light transmitted by the transmittance adjusting component to identify the fingerprint.

[0133] Based on the same inventive concept, an embodiment of the present application further provides a fingerprint recognition device, including: a fingerprint recognition panel.

[0134] Among them, the fingerprint recognition panel is the fingerprint recognition device provided in the above-mentioned embodiment, and its implementation principle and implementation effect are similar, which will not be repeated here.

[0135] The drawings of the embodiments of the present application only involve the structures involved in the embodiments of the present application, and other structures can refer to the general design.

[0136] For the sake of clarity, in the drawings used to describe the embodiments of the present application, the thickness and size of the layer or microstructure are exaggerated. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element, or there may be intermediate elements.

[0137] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted to facilitate understanding of this application and are not intended to limit this application. Any technician in the field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. A fingerprint recognition panel, characterized in that: include: A display component, a control component, and a transmittance adjustment component and a fingerprint recognition component arranged on the backlight side of the display component. The transmittance adjustment component is arranged on a side of the fingerprint recognition component close to the display component. The working states of the fingerprint recognition panel include: a display stage and a fingerprint recognition stage. In the display stage, The display component is used to emit a first light to display an image to be displayed; The transmittance adjustment component is used to receive the ambient light transmitted by the display component; The control component is connected to the transmittance adjusting component and is used to control the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is less than a threshold transmittance; During the fingerprint recognition phase, The display component is further used to emit a second light to the fingerprint to be tested; The transmittance adjustment component is further used to receive the second light reflected by the fingerprint to be detected; The control component is further used to control the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is greater than the threshold transmittance; The fingerprint recognition component is used to receive the light transmitted by the transmittance adjustment component and obtain a fingerprint image according to the light transmitted by the transmittance adjustment component to recognize the fingerprint.

2. The fingerprint recognition panel according to claim 1, characterized in that: The control component is used to generate a first control signal in the display stage, and control the transmittance of the transmittance adjusting component according to the first control signal, so that the transmittance of the transmittance adjusting component is less than a threshold transmittance, and is also used to generate a second control signal in the fingerprint recognition stage, and control the transmittance of the transmittance adjusting component according to the second control signal, so that the transmittance of the transmittance adjusting component is greater than the threshold transmittance.

3. The fingerprint recognition panel according to claim 1, characterized in that: The fingerprint recognition component comprises: a substrate and a plurality of photoelectric sensors arranged on the substrate; The plurality of photosensors are disposed on a side of the substrate close to the display assembly.

4. The fingerprint recognition panel according to claim 2, characterized in that: The display component includes: a plurality of point light sources, the plurality of point light sources emit light sequentially during the fingerprint recognition stage; The transmittance adjustment component comprises: a plurality of transmittance adjustment structures, each of which corresponds to each of the point light sources; The orthographic projection of the transmittance adjusting structure on the display component covers the orthographic projection of the point light source corresponding to the transmittance adjusting structure on the display component; The control assembly is connected to each transmittance adjusting structure respectively, and is used to control the transmittance of each transmittance adjusting structure.

5. The fingerprint recognition panel according to claim 4, characterized in that: Each transmittance adjustment structure includes: a first electrode, a second electrode, and a transmittance adjustment layer disposed between the first electrode and the second electrode; The control component is connected to the first electrode and the second electrode respectively, and is specifically used to provide an electric signal to the first electrode and the second electrode according to a first control signal in a display stage, and form a first electric field between the first electrode and the second electrode, so that the transmittance of the transmittance adjustment layer is less than a threshold transmittance under the action of the first electric field, and is also used to provide an electric signal to the first electrode and the second electrode according to a second control signal in a fingerprint recognition stage, and form a second electric field between the first electrode and the second electrode, so that the transmittance of the transmittance adjustment layer is greater than the threshold transmittance under the action of the second electric field; The first electrode and the second electrode are transmissive electrodes.

6. The fingerprint recognition panel according to claim 5, characterized in that: The first electrodes of adjacent light transmittance adjusting structures are separately arranged, and the second electrodes of adjacent light transmittance adjusting structures are separately arranged; The i-th point light source corresponds to the i-th transmittance adjustment structure. When the i-th point light source is emitting light, the control component is used to control the transmittance of the i-th transmittance adjustment structure to be a first transmittance during the fingerprint recognition stage, and to control the transmittance of all other transmittance adjustment structures except the i-th transmittance adjustment structure to be a second transmittance according to a second control signal, wherein the first transmittance is less than or greater than the second transmittance.

7. The fingerprint recognition panel according to claim 5, characterized in that: The first electrodes of adjacent transmittance adjusting structures are connected to each other, and the second electrodes of adjacent transmittance adjusting structures are connected to each other.

8. The fingerprint recognition panel according to claim 5, characterized in that: The light transmittance adjustment layer includes: a holographic polymer dispersed liquid crystal Bragg volume grating or a cholesteric liquid crystal.

9. The fingerprint recognition panel according to claim 5, characterized in that: The light transmittance adjustment layer is a color-changing layer; The materials for making the color-changing layer include: polyaniline, viologen, tungsten trioxide, polythiophene and its derivatives, viologen compounds, tetrathiafulvalene, and metal phthalocyanine compounds.

10. The fingerprint recognition panel according to claim 1, characterized in that: The fingerprint recognition panel further includes: a collimation layer; The collimating layer is arranged on a side of the light transmittance adjusting component close to the display component, and is used to filter the incident light so that the light with a scattering angle within a preset range passes through the collimating layer; The incident light is the ambient light transmitted by the display component in the display stage, and is the second light reflected by the fingerprint to be detected in the fingerprint recognition stage.

11. The fingerprint recognition panel according to claim 1, characterized in that: The display component includes an organic light emitting diode display substrate.

12. A fingerprint recognition device, characterized in that: include: A fingerprint recognition panel as claimed in any one of claims 1 to 11.

13. A method for controlling a fingerprint recognition panel, characterized in that: Applied to the fingerprint recognition panel according to any one of claims 1 to 11, the method comprises: in the display stage, emitting a first light to display an image to be displayed; receiving ambient light transmitted by the display component; Controlling the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is less than a threshold transmittance; The method further comprises: in the fingerprint recognition stage, emitting a second light beam toward the fingerprint to be tested; Receiving a second light reflected by the fingerprint to be detected; Controlling the transmittance of the transmittance adjusting component so that the transmittance of the transmittance adjusting component is greater than the threshold transmittance; The light transmitted by the transmittance adjusting component is received, and a fingerprint image is obtained according to the light transmitted by the transmittance adjusting component to identify the fingerprint.

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