Display device, fingerprint identification method thereof and electronic equipment

Abstract

The embodiment of the invention provides a display device, a fingerprint identification method thereof and electronic equipment, and relates to the technical field of display. The display device comprises a display panel, a friction assembly and an optical fingerprint element, the friction assembly is located on the light emitting side of the display panel, the optical fingerprint element is located on the backlight side of the display panel, and the orthographic projection of the friction assembly on the display panel is located in the orthographic projection of the optical fingerprint element on the display panel. According to the display device, the authenticity of the finger is judged by arranging the friction assembly, and the matching degree of the fingerprint is judged by combining the optical fingerprint element, so that the anti-counterfeiting capability and the use safety of the display device are improved. Furthermore, the orthographic projection of the friction assembly on the display panel is located in the orthographic projection of the optical fingerprint element on the display panel, so that the misjudgment of the display device on the combination of the true fingerprint of the real finger and the false fingerprint of the false finger is avoided, and the anti-counterfeiting capability of the display device and the use safety of the display device are further improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a fingerprint recognition method and an electronic device thereof. Background Art

[0002] In recent years, with the rapid development of display technology, terminal devices with biometric recognition functions have gradually become a necessity in life. Among them, fingerprint recognition is widely used in various terminal devices to increase user security due to its unique identity characteristics. Optical fingerprint recognition technology has been applied to various display products and smart home devices due to its unique advantages such as high environmental adaptability and good stability.

[0003] However, in the related art, the anti-counterfeiting performance of the display device is relatively weak. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a display device and a fingerprint recognition method thereof and an electronic device to solve the problem of weak anti-counterfeiting performance in existing display devices.

[0005] In a first aspect, the present application provides a display device, including a display panel, a friction assembly and an optical fingerprint element. The display panel includes a light-emitting side and a backlight side opposite to each other. The friction element is located on the light-emitting side, the optical fingerprint element is located on the backlight side, and the orthographic projection of the friction assembly on the display panel is located within the orthographic projection of the optical fingerprint element on the display panel.

[0006] In one embodiment, the friction assembly includes a friction electrode layer, the friction electrode layer includes a plurality of friction electrode parts, and the plurality of friction electrode parts are arranged in an array; preferably, the material of the friction electrode layer includes at least one of indium tin oxide, silver, titanium aluminum titanium, copper, and molybdenum; preferably, it also includes a pressure detection device, and the pressure detection device is electrically connected to the friction assembly.

[0007] In one embodiment, the friction component also includes a friction contact layer, which is located on the side of the friction electrode layer away from the display panel, and the friction contact layer includes a plurality of friction contact parts, which are arranged in an array; preferably, the plurality of friction contact parts and the plurality of friction electrode parts are arranged correspondingly, and the friction contact parts and the corresponding friction electrode parts are at least partially in contact; preferably, the material of the friction contact layer includes at least one of polyethylene terephthalate and polydimethylsiloxane.

[0008] In one embodiment, it also includes a redundant electrode layer, which is arranged on the same layer as the friction electrode layer, and the redundant electrode layer and the friction electrode layer are disconnected; preferably, the redundant electrode layer surrounds the friction electrode layer; preferably, the redundant electrode layer and the friction electrode layer are made of the same material; preferably, it also includes a redundant contact layer, which is arranged on the same layer as the friction contact layer, and the redundant contact layer and the friction contact layer are disconnected; preferably, the redundant contact layer surrounds the friction contact layer; preferably, the redundant contact layer and the friction contact layer are made of the same material.

[0009] In one embodiment, it also includes an electrical parameter detection unit, which is connected to the friction assembly and is grounded.

[0010] In one embodiment, the surface of the friction component facing away from the display panel has an uneven structure.

[0011] In one embodiment, in a direction perpendicular to the display panel, the display panel includes a stacked substrate, a display function layer, a packaging layer and a touch layer; preferably, the friction component is located on the side of the touch layer away from the substrate; preferably, the friction component and the touch layer are arranged in the same layer.

[0012] The second aspect of the present application provides a fingerprint recognition method for a display device, which is applicable to the above-mentioned display device; the fingerprint recognition method includes: acquiring a fingerprint image and an electrical signal of a friction component; and determining that the fingerprint recognition is successful based on the fingerprint image, the electrical signal, and a pre-stored reference image and reference electrical signal.

[0013] In one embodiment, based on the fingerprint image, the electrical signal, and the pre-stored reference image and the reference electrical signal, determining whether the fingerprint recognition is successful includes: determining the matching degree between the fingerprint image and the reference image; determining the difference between the electrical signal and the reference electrical signal; if the matching degree is greater than or equal to the first threshold value, and the difference is less than or equal to the second threshold value, then determining that the fingerprint recognition is successful; preferably, the friction component includes a friction electrode layer, the friction electrode layer includes a plurality of friction electrode parts, and the plurality of friction electrode parts are arranged in an array. Before determining the matching degree between the fingerprint image and the reference image, the fingerprint recognition method also includes: obtaining the pressure values ​​of the plurality of friction electrode parts to obtain a pressure distribution map of the friction electrode layer; determining the point position in the pressure distribution map where the pressure value is less than a preset voltage; enhancing the light intensity of the point position of the fingerprint image to obtain an enhanced fingerprint image; judging the matching degree between the fingerprint image and the reference image, and judging the difference between the electrical signal and the reference electrical signal; including: judging the matching degree between the enhanced fingerprint image and the reference image, and judging the difference between the electrical signal and the reference electrical signal.

[0014] A third aspect of the present application provides an electronic device, comprising the above-mentioned display device.

[0015] According to the display device and fingerprint recognition method and electronic device provided by the embodiment of the present application, the authenticity of the finger is judged by setting a friction component, and the matching degree of the fingerprint is judged in combination with the optical fingerprint element, thereby improving the anti-counterfeiting ability of the display device and the safety of use of the display device. Furthermore, the orthographic projection of the friction component on the display panel is located within the orthographic projection of the optical fingerprint element on the display panel, thereby avoiding the display device from misjudging the combination of the real finger fake fingerprint and the fake finger real fingerprint, thereby further improving the anti-counterfeiting ability of the display device and the safety of use of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments 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 present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1a It is a top view of the display device provided in the first embodiment of the present application.

[0018] Figure 1b yes Figure 1a The cross-sectional structure diagram of the display device along the AA' direction is shown.

[0019] Figure 2 It is a schematic cross-sectional structure diagram of a display device provided in the second embodiment of the present application.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of a display panel provided in the third embodiment of the present application.

[0021] Figures 4a to 4j yes Figure 3 A schematic diagram of the friction electrode portion of the display panel is shown.

[0022] Figure 5 It is a top view of the friction electrode layer and the redundant electrode layer of the display device provided in the fourth embodiment of the present application.

[0023] Figure 6 yes Figure 5 A top view of the friction contact layer and the redundant contact layer of the display device is shown.

[0024] Figure 7 yes Figure 5 A schematic cross-sectional structural diagram of a display device is shown.

[0025] Figures 8a to 8d It is a diagram of the film layer structure during the fingerprint recognition process of the display device provided in an embodiment of the present application.

[0026] Figures 9a to 9f 1 is a diagram showing the working principle of the friction assembly of the display device provided in an embodiment of the present application.

[0027] Figures 10a to 10f This is another working principle diagram of the friction assembly of the display device provided in an embodiment of the present application.

[0028] Fig.11 It is a schematic diagram of the cross-sectional structure of a display device provided in the fifth embodiment of the present application.

[0029] Fig.12 This is a fingerprint recognition method for a display device provided in the first embodiment of the present application.

[0030] Fig.13 This is a fingerprint recognition method for a display device provided in the second embodiment of the present application.

[0031] Fig.14 It is the pressure distribution diagram and signal distribution diagram of the display device. DETAILED DESCRIPTION

[0032] In recent years, with the rapid development of display technology, terminal devices with biometric functions have gradually become a necessity in life. Among them, fingerprint recognition is widely used in various terminal devices to increase user security due to its unique identity characteristics. Optical fingerprint recognition technology has been applied to various display products and smart home devices due to its unique advantages such as high environmental adaptability and good stability. However, in the related technology, the anti-counterfeiting performance of the display device is weak.

[0033] In view of this, the embodiment of the present application provides a display device and a fingerprint recognition method and electronic device thereof, which can improve the anti-counterfeiting ability of the display device and the safety of use of the display device by setting a friction component to judge the authenticity of the finger and combining the optical fingerprint element to judge the matching degree of the fingerprint. Furthermore, the orthographic projection of the friction component on the display panel is located within the orthographic projection of the optical fingerprint element on the display panel, avoiding the display device from misjudging the combination of real finger fake fingerprint and fake finger real fingerprint, further improving the anti-counterfeiting ability of the display device and the safety of use of the display device.

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0038] Figure 1a is a top view of a display device provided in the first embodiment of the present application, Figure 1b yes Figure 1a The cross-sectional structure diagram of the display device shown in FIG. Figure 1a and Figure 1b As shown, the display device includes a display panel 10, a friction component 20 and an optical fingerprint element 30. The display panel 10 includes a light-emitting side 101 and a backlight side 102 opposite to each other. The friction component 20 is located on the light-emitting side 101 of the display panel 10. The optical fingerprint element 30 is located on the backlight side 102 of the display panel 10. The orthographic projection of the friction component 20 on the display panel 10 is located within the orthographic projection of the optical fingerprint element 30 on the display panel.

[0039] The display device provided in the embodiment of the present application improves the anti-counterfeiting ability of the display device and the safety of use of the display device by setting a friction component to judge the authenticity of the finger and combining it with the optical fingerprint element to judge the matching degree of the fingerprint. Furthermore, the orthographic projection of the friction component on the display panel is located within the orthographic projection of the optical fingerprint element on the display panel, avoiding the display device from misjudging the combination of real finger fake fingerprint and fake finger real fingerprint, further improving the anti-counterfeiting ability of the display device and the safety of use of the display device.

[0040] The display panel 10 may be an organic light-emitting diode (OLED) display device, a liquid crystal panel, or a micro flat panel display device (Micro-OLED or Micro-LED).

[0041] Optionally, in one embodiment, in a direction Z perpendicular to the display panel 10 , the display panel 10 includes a substrate 11 , a display function layer 12 , an encapsulation layer 13 and a touch layer 14 that are stacked.

[0042] Among them, the substrate 11 can be a substrate substrate. In some embodiments, the substrate substrate can be a glass-based substrate. In some embodiments, the substrate substrate can include an organic resin material such as epoxy resin, triazine, silicone resin or polyimide. For example, the substrate substrate can be an FR4 type printed circuit board (Printed circuit board, PCB), or it can be a flexible PCB that is easy to deform. In some embodiments, the substrate substrate can include a ceramic material such as silicon nitride, aluminum nitride or aluminum oxide, or include a metal or a metal compound. For example, the substrate substrate can be a metal core printed circuit board (Metal Core PCB, MCPCB) or a metal copper clad laminate (Metal Copper Clad Laminate, MCCL).

[0043] Furthermore, in one embodiment, the substrate 11 may have a driving circuit, which is used to drive multiple light-emitting devices to emit light of corresponding colors. For example, the substrate 11 may include a substrate layer, a barrier layer (Barrier), a buffer layer (Buffer), a gate insulating layer (Gate Insulator, GI), a capacitor insulating layer (Capacitance Insulator, CI), a gate, a source and drain, an interlayer dielectric layer (Interlayer Dielectric, ILD), etc.

[0044] Optionally, in one embodiment, the display function layer 12 may include an anode layer, a light-emitting layer, and a cathode layer stacked on the substrate 11 .

[0045] The present application does not limit the specific film layers of the encapsulation layer 13 . For example, the encapsulation layer 13 may include at least one organic layer and at least one inorganic layer.

[0046] Optionally, in one embodiment, the encapsulation layer 13 includes an inorganic encapsulation layer, an organic encapsulation layer, and an inorganic encapsulation layer stacked in sequence.

[0047] Optionally, in one embodiment, the friction component 20 is located on a side of the touch layer 14 facing away from the substrate.

[0048] Optionally, in one embodiment, the friction component 20 may be disposed on the same layer as the touch layer 14 .

[0049] Optionally, in one embodiment, in order to save material of the display device and make the display device thinner and lighter, the friction component 20 may include a film layer. Specifically, the friction component 20 includes a friction electrode layer 21 .

[0050] Optionally, in one embodiment, the material of the friction electrode layer 21 includes at least one of indium tin oxide, silver, titanium aluminum titanium, copper, and molybdenum. Indium tin oxide has electrical conductivity and optical transparency, is easy to deposit into a thin film, and has wet chemical resistance. Of course, the friction electrode layer 21 can also be made of other materials without special limitation.

[0051] Optionally, in one embodiment, the optical fingerprint element 30 may be used to obtain a fingerprint image. The optical fingerprint element 30 may process the obtained fingerprint image, and the optical fingerprint element 30 may determine whether to unlock the display device according to the matching degree between the fingerprint image and the reference image.

[0052] The present application does not limit the specific location of the optical fingerprint element 30. For example, in some embodiments, the optical fingerprint element 30 is located on the backlight side 102 of the display panel 10; in other embodiments, the optical fingerprint element 30 is located on the light output side 101 of the display panel 10; in still other embodiments, the optical fingerprint element 30 is integrated inside the display panel 10.

[0053] Optionally, in one embodiment, the display device further includes an electrical parameter detection unit 40, which is connected to the friction component 20, and the electrical parameter detection unit 40 is grounded. The electrical parameter detection unit 40 is a component for detecting the size of electrical parameters generated by the friction component 20 during touch. The electrical parameter detection unit 40 can be used to detect at least one of physical quantities such as charge, voltage, current, and number of electrons.

[0054] Figure 2 is a schematic diagram of the cross-sectional structure of a display device provided in the second embodiment of the present application. Figure 2 As shown, the friction assembly 20 includes two film layers.

[0055] Optionally, in one embodiment, the friction assembly 20 further includes a friction contact layer 22 , and the friction contact layer 22 is located on a side of the friction electrode layer 21 facing away from the display panel 10 .

[0056] Optionally, in one embodiment, the material of the friction contact layer 22 includes at least one of polyethylene terephthalate and polydimethylsiloxane.

[0057] Optionally, in one embodiment, the friction contact layer 23 is reused as a protective layer to protect other film layers of the display panel 10 from being damaged.

[0058] Figure 3 is a schematic cross-sectional structure diagram of a display panel provided in the third embodiment of the present application, Figures 4a to 4j yes Figure 3 Schematic diagram of the friction electrode portion of the display panel shown in FIG. Figure 3As shown, the friction electrode layer 21 includes a plurality of friction electrode portions 211 , and the plurality of friction electrode portions 211 are arranged in an array.

[0059] The present application does not limit the specific shape of the friction electrode portion 211. For example, Figures 4a to 4j As shown, the friction electrode portion 211 can be circular, rectangular, square, diamond, polygonal, irregular, etc.

[0060] Optionally, in one embodiment, the display device further includes a pressure detection device 50 , which is electrically connected to the friction assembly 20 , and the pressure detection device 50 is capable of detecting pressure distribution of the plurality of friction electrode portions 211 .

[0061] Optionally, in one embodiment, the friction contact layer 22 includes a plurality of friction contact portions 221 , and the plurality of friction contact portions 221 are arranged in an array.

[0062] Optionally, in one embodiment, a plurality of friction contact portions 221 and a plurality of friction electrode portions 211 are provided correspondingly, and the friction contact portions 221 and the corresponding friction electrode portions 211 are at least partially in contact with each other.

[0063] The present application does not limit the specific shape of the friction contact portion 221. For example, the friction contact portion 221 may be circular, rectangular, square, diamond, polygonal, irregular, or the like.

[0064] Optionally, in one embodiment, the friction contact portion 221 and the corresponding friction electrode portion 211 have the same shape.

[0065] Optionally, in one embodiment, the friction contact portion 221 and the corresponding friction electrode portion 211 have different shapes.

[0066] Figure 5 is a top view of a friction electrode layer and a redundant electrode layer of a display device provided in a fourth embodiment of the present application, Figure 6 yes Figure 5 A top view of the friction contact layer and the redundant contact layer of the display device shown, Figure 7 yes Figure 5 The cross-sectional structure diagram of the display device is shown in FIG. Figures 5 to 7 As shown, the display device further includes a redundant electrode layer 60, which is disposed on the same layer as the friction electrode layer 21, and the redundant electrode layer 60 is disconnected from the friction electrode layer 21. The redundant electrode layer 60 can improve the display uniformity of the display device without affecting the recognition result of the friction electrode layer 21.

[0067] Optionally, in one embodiment, the redundant electrode layer 60 surrounds the friction electrode layer 21 .

[0068] Optionally, in one embodiment, the redundant electrode layer 60 and the friction electrode layer 21 are made of the same material.

[0069] Optionally, in one embodiment, the display device further includes a redundant contact layer 70, which is disposed in the same layer as the friction contact layer 22, and the redundant contact layer 70 is disconnected from the friction contact layer 22. The redundant contact layer 70 can improve the display uniformity of the display device without affecting the recognition result of the friction contact layer 22.

[0070] Optionally, in one embodiment, the redundant contact layer 70 surrounds the friction contact layer 22 .

[0071] Optionally, in one embodiment, the redundant contact layer 70 and the friction contact layer 22 are made of the same material.

[0072] Figures 8a to 8c It is a diagram of the film layer structure in the fingerprint recognition process of the display device provided in an embodiment of the present application. The friction component 20 can determine the authenticity of the finger. Specifically, when a living finger contacts the friction component 20, a specific friction charge will be generated (for example, after contact, the living finger carries a certain amount of positive charge, and the friction component 20 carries a certain amount of negative charge). After the non-living finger contacts the friction component 20, the type of charge or the amount of charge carried must be different from that of the living finger. This difference serves as the basis for liveness detection. When the living finger leaves, in order to maintain charge conservation, the friction component 20 will induce a charge consistent with the charge carried by the living finger, and the corresponding electrical signal can be detected in the external circuit. After the non-living finger leaves the contact, the electrical signal detected in the external circuit must be different from this electrical signal. Figure 8a and Figure 8b As shown, when a pseudo fingerprint of a live finger, a real fingerprint of a non-live finger, or a pseudo fingerprint of a live finger and a real fingerprint of a non-live finger are used together, the friction component 20 will not detect an electrical signal. Figure 8c and Figure 8d As shown, only the real fingerprint of a living finger can realize the recognition function normally and correctly.

[0073] Figures 9a to 9f 2 is a working principle diagram of the friction assembly of the display device provided in the embodiment of the present application. The working principle of the friction assembly 20 is as follows:

[0074] like Figure 9a As shown, the friction electrode layer 21 and the friction contact layer 22 are in an initial state, and the electrical parameter detection unit 40 is grounded, and there is no electrical signal at this time.

[0075] like Figure 9bAs shown, when the living finger contacts the friction contact layer 22, due to the different frictional electrical properties of the living finger and the friction contact layer 22 (assuming that the surface of the living finger carries a positive charge and the surface of the friction contact layer 22 carries a negative charge), the mutual contact will cause the two surfaces to carry equal amounts of opposite charges, and at this time, the overall charge conservation is satisfied.

[0076] like Fig.9c and Figure 9d As shown, when the living finger leaves the surface of the friction contact layer 22, in order to maintain charge conservation, the friction electrode layer 21 will induce a charge with opposite electrical properties to the friction contact layer 22 (positive charge in this case). At this time, the charge will flow from the ground to the friction electrode layer 21 through the electrical parameter detection unit 40, and the electrical parameter detection unit 40 can detect the electrical signal. The detected electrical signal will increase as the degree of departure of the living finger increases until it reaches the maximum value when it is completely left.

[0077] like Fig.9e As shown, when the living finger completely leaves the friction contact layer 22 , no charge will flow in the electrical parameter detection unit 40 .

[0078] like Figure 9f and Figure 9d As shown, when the finger contacts the friction contact layer 22 again, in order to maintain charge conservation, the charge opposite to that in the separation process will flow from the ground point into the friction electrode layer 21 through the electrical parameter detection unit 40, and the electrical parameter detection unit 40 can detect the opposite electrical signal. The detected electrical signal will increase with the increase of the contact degree of the living finger until it reaches the maximum value when it is fully contacted.

[0079] Figures 10a to 10f FIG. 2 is another working principle diagram of the friction assembly of the display device provided in the embodiment of the present application. Figures 10a to 10f As shown, when the pseudo finger and the friction contact layer 22 are in contact and separated, according to the aforementioned working principle, the generated electrical signal may be completely opposite to that of the living finger, and the signal amount may also be different, which will not be described in detail here.

[0080] Fig.11 Schematic diagram of the cross-sectional structure of the display device provided in the fifth embodiment of the present application. Fig.11 As shown, the surface of the friction component 20 facing away from the display panel 10 is an uneven structure, which helps to increase the roughness of the surface of the friction component 20, increase the effective contact area between the finger and the friction component 20, increase the charge amount, and improve the accuracy of fingerprint recognition.

[0081] Optionally, in one embodiment, the uneven structure may be formed by photolithography or plasma treatment on the surface of the friction component 20 facing away from the display panel 10 .

[0082] The present application also provides a fingerprint recognition method, which is applicable to the display device provided in the above embodiment.

[0083] Fig.12 This is a fingerprint recognition method for a display device provided by the first embodiment of the present application. Fig.12 As shown, the fingerprint recognition method includes:

[0084] Step S100: acquiring a fingerprint image and an electrical signal of a friction component.

[0085] The fingerprint image is obtained through the optical fingerprint element, and the electrical signal of the friction component can be obtained through the electrical parameter detection unit.

[0086] Step S200: Determine whether fingerprint recognition is successful based on the fingerprint image, the electrical signal, and the pre-stored reference image and reference electrical signal.

[0087] Among them, based on the fingerprint image, the electrical signal, and the pre-stored reference image and reference electrical signal, determining that the fingerprint recognition is successful includes: determining the matching degree between the fingerprint image and the reference image; determining the difference between the electrical signal and the reference electrical signal; if the matching degree is greater than or equal to the first threshold, and the difference is less than or equal to the second threshold, then determining that the fingerprint recognition is successful.

[0088] If the matching degree is greater than or equal to the first threshold and the difference is less than or equal to the second threshold, the fingerprint is determined to be a genuine fingerprint, the finger is a genuine finger, and the fingerprint recognition is successful.

[0089] If the matching degree is less than the first threshold and the difference is less than or equal to the second threshold, the fingerprint is determined to be a fake fingerprint and the finger is a real finger, and the fingerprint recognition fails.

[0090] If the matching degree is greater than or equal to the first threshold, and the difference is greater than the second threshold, the fingerprint is determined to be a true fingerprint, the finger is a fake finger, and the fingerprint recognition fails.

[0091] If the matching degree is less than the first threshold and the difference is greater than the second threshold, the fingerprint is determined to be a fake fingerprint, the finger is a fake finger, and the fingerprint recognition fails.

[0092] The fingerprint recognition method of the display device provided in the embodiment of the present application first obtains the fingerprint image and the electrical signal of the friction component, and then determines the fingerprint recognition success based on the fingerprint image, the electrical signal, and the pre-stored reference image and reference electrical signal. The above method judges the authenticity of the finger through the friction component, and judges the matching degree of the fingerprint in combination with the optical fingerprint element, thereby improving the anti-counterfeiting ability of the display device and the safety of the display device.

[0093] Fig.13 The fingerprint recognition method of the display device provided by the second embodiment of the present application is as follows: Fig.14 It is the pressure distribution diagram and signal distribution diagram of the display device. Fig.13 As shown, before determining the matching degree between the fingerprint image and the reference image, the fingerprint recognition method further includes:

[0094] Step S201: Obtain pressure values ​​of a plurality of friction electrode portions to obtain a pressure distribution diagram of the friction electrode layer.

[0095] Among them, the pressure values ​​of multiple friction electrode parts can be obtained through the pressure detection device, the pressure distribution of the friction electrode layer can be obtained, and thus the pressure distribution diagram can be obtained.

[0096] Step S202: Determine a point in the pressure distribution diagram where the pressure value is less than a preset voltage.

[0097] Among them, the pressure distribution can be understood as the force with which the finger presses the friction electrode layer. If the pressure value is greater than or equal to the preset voltage value, the finger presses the area with greater force (for example, the middle area of ​​the finger), and the light intensity of the area in the fingerprint image is stronger. If the pressure value is less than the preset voltage value, the finger presses the area with less force (for example, the edge area of ​​the finger), and the light intensity of the area in the fingerprint image is weaker.

[0098] Specifically, after the finger contacts the fingerprint recognition area, the friction component 20 can display the pressure value distribution when the finger presses through a signal distribution diagram, thereby realizing touch imaging.

[0099] Determine the point where the pressure value in the pressure distribution map is less than the preset voltage, that is, determine the point where the finger presses with less force, and then determine the point where the light intensity is weaker in the fingerprint image.

[0100] Step S203: enhancing the light intensity of the points of the fingerprint image to obtain an enhanced fingerprint image.

[0101] The light intensity of the points of the fingerprint image is enhanced to obtain an enhanced fingerprint image, wherein the enhanced fingerprint image is clearer than the fingerprint image.

[0102] When determining the matching degree between the fingerprint image and the reference image, determining the difference between the electrical signal and the reference electrical signal (step S400) includes:

[0103] Step S210, determining the matching degree between the enhanced fingerprint image and the reference image, and determining the difference between the electrical signal and the reference electrical signal.

[0104] The reference image is an image pre-stored in the display device by the user, and the reference electrical signal is a signal pre-stored in the display device by the user.

[0105] The fingerprint recognition method for the display device provided in the embodiment of the present application first obtains the fingerprint image and the electrical signal of the friction component, and then determines the success of fingerprint recognition based on the fingerprint image, the electrical signal, and the pre-stored reference image and reference electrical signal. The above method determines the authenticity of the finger through the friction component, and combines the optical fingerprint element to determine the matching degree of the fingerprint, thereby improving the anti-counterfeiting ability of the display device and the safety of use of the display device. Furthermore, the pressure distribution map is used to determine the point where the pressure value in the pressure distribution map is less than the preset voltage, and the light intensity of the point of the fingerprint image is enhanced to obtain an enhanced fingerprint image, determine the matching degree of the enhanced fingerprint image and the reference image, and determine the difference between the electrical signal and the reference electrical signal. Through a clearer fingerprint image, the accuracy of fingerprint recognition is improved to avoid unclear fingerprint imaging due to inappropriate pressing posture, and the occurrence of fingerprint recognition misrecognition or rejection.

[0106] An embodiment of the present application further provides an electronic device, the electronic device comprising the display device provided in the above embodiment. The display device is a product having an image display function. For example, the display device can be used to display static images, such as pictures or photos. The display device can also be used to display dynamic images, such as videos.

[0107] In addition, the display device may also have functions such as taking photos, recording videos, fingerprint recognition, and face recognition. Accordingly, the display device also includes at least one functional module for realizing the above functions, such as an under-screen camera, an under-screen fingerprint recognition sensor, and the like.

[0108] The electronic device provided according to any embodiment of the present application and the display device provided in the embodiment of the present application belong to the same inventive concept, and have corresponding film layer structures and beneficial effects. Details not fully described in the embodiment of the electronic device can be found in the embodiment of the display device, and will not be repeated here.

[0109] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0110] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A display device, characterized in that: include: A display panel, comprising a light emitting side and a backlight side opposite to each other; A friction component, located on the light-emitting side; as well as The optical fingerprint element is located on the backlight side, and the orthographic projection of the friction component on the display panel is located within the orthographic projection of the optical fingerprint element on the display panel.

2. The display device according to claim 1, characterized in that The friction assembly includes a friction electrode layer, the friction electrode layer includes a plurality of friction electrode parts, and the plurality of friction electrode parts are arranged in an array; Preferably, the material of the friction electrode layer includes at least one of indium tin oxide, silver, titanium aluminum titanium, copper, and molybdenum; Preferably, it also includes a pressure detection device, and the pressure detection device is electrically connected to the friction assembly.

3. The display device according to claim 2, characterized in that: The friction assembly further includes a friction contact layer, the friction contact layer is located on a side of the friction electrode layer away from the display panel, the friction contact layer includes a plurality of friction contact parts, and the plurality of friction contact parts are arranged in an array; Preferably, the plurality of friction contact parts and the plurality of friction electrode parts are arranged correspondingly, and the friction contact parts and the corresponding friction electrode parts are at least partially in contact; Preferably, the material of the friction contact layer includes at least one of polyethylene terephthalate and polydimethylsiloxane.

4. The display device according to claim 3, characterized in that: It also includes a redundant electrode layer, wherein the redundant electrode layer and the friction electrode layer are arranged on the same layer, and the redundant electrode layer and the friction electrode layer are disconnected; Preferably, the redundant electrode layer surrounds the friction electrode layer; Preferably, the redundant electrode layer and the friction electrode layer are made of the same material; Preferably, it further comprises a redundant contact layer, wherein the redundant contact layer and the friction contact layer are arranged in the same layer, and the redundant contact layer and the friction contact layer are disconnected; Preferably, the redundant contact layer surrounds the friction contact layer; Preferably, the redundant contact layer and the friction contact layer are made of the same material.

5. The display device according to claim 1, characterized in that It also includes an electrical parameter detection unit, which is connected to the friction assembly and is grounded.

6. The display device according to claim 1, characterized in that: The surface of the friction component on a side facing away from the display panel has an uneven structure.

7. The display device according to claim 1, characterized in that: In a direction perpendicular to the display panel, the display panel includes a substrate, a display function layer, a packaging layer and a touch layer which are stacked; Preferably, the friction component is located on a side of the touch layer away from the substrate; Preferably, the friction component and the touch layer are arranged in the same layer.

8. A fingerprint recognition method for a display device, characterized in that: A display device suitable for use in any one of claims 1 to 7; The fingerprint recognition method comprises: Acquiring a fingerprint image and an electrical signal of the friction component; Based on the fingerprint image, the electrical signal, and the pre-stored reference image and reference electrical signal, it is determined that the fingerprint recognition is successful.

9. The fingerprint recognition method according to claim 8, characterized in that: The determining that fingerprint recognition is successful based on the fingerprint image, the electrical signal, and the pre-stored reference image and reference electrical signal includes: Determining a degree of match between the fingerprint image and a reference image; determining a difference between the electrical signal and a reference electrical signal; If the matching degree is greater than or equal to a first threshold, and the difference is less than or equal to a second threshold, then it is determined that the fingerprint recognition is successful; Preferably, the friction assembly includes a friction electrode layer, the friction electrode layer includes a plurality of friction electrode parts, and the plurality of friction electrode parts are arranged in an array. Before determining the matching degree between the fingerprint image and the reference image, the fingerprint recognition method further includes: Obtaining a pressure distribution diagram of a plurality of the friction electrode parts; Determine a point in the pressure distribution diagram where the pressure value is less than a preset voltage; Performing enhancement processing on the light intensity of the points of the fingerprint image to obtain an enhanced fingerprint image; Determining the matching degree between the fingerprint image and the reference image includes: A degree of match between the enhanced fingerprint image and the reference image is determined.

10. An electronic device, characterized in that: A display device comprising any one of claims 1 to 7.

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