Display backplane, manufacturing method thereof, display panel and display device

Abstract

The application provides a display backboard, a manufacturing method thereof, a display panel and a display device. The display backboard is divided into a display area and a non-display area surrounding the display area, and the non-display area includes a fingerprint identification area. The display backboard includes: a substrate; a thin film transistor array layer arranged on one side of the substrate; a capacitor electrode layer including a first electrode layer and a second electrode layer; and a light emitting element arranged on the side of the thin film transistor array layer away from the substrate. A fingerprint identification sensor is arranged in the fingerprint identification area, and a driving electrode and a sensing electrode are arranged in the same layer as the first electrode layer and the second electrode layer of the capacitor electrode layer, respectively.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to display backplanes and their manufacturing methods, display panels, and display devices. Background Technology

[0002] Currently, with the widespread adoption of full-screen display devices, optical fingerprint recognition under the display panel requires drilling holes in the display panel and rearranging the metal traces under the display panel to allow more light to be captured by the fingerprint sensor. This results in a complex structure for the display device that implements fingerprint recognition, and the fingerprint sensor is easily affected by stray light, leading to poor fingerprint recognition accuracy.

[0003] Therefore, existing display devices capable of fingerprint recognition still need improvement. Summary of the Invention

[0004] This application aims to at least partially solve one of the technical problems in the related art. To this end, one objective of this application is to propose a display back panel that is simple in structure, easy to implement, capable of fingerprint recognition, requires no additional process steps during manufacturing based on fingerprint recognition, does not require rearranging metal traces, does not occupy the space of the display area for fingerprint recognition, and is easy to implement with a narrow bezel.

[0005] In one aspect of this application, a display back panel is provided. According to an embodiment of this application, the display back panel is divided into a display area and a non-display area surrounding the display area. The non-display area includes a fingerprint recognition area. The display back panel includes: a substrate; a thin-film transistor array layer disposed on one side of the substrate, the thin-film transistor array layer including a gate, an active layer, a source, and a drain; a capacitor electrode layer including a first electrode layer and a second electrode layer, the first electrode layer being disposed on the same layer as the gate, and the second electrode layer being disposed on the side of the first electrode layer away from the substrate; a light-emitting element disposed on the side of the thin-film transistor array layer away from the substrate; and a fingerprint recognition sensor located in the fingerprint recognition area, with the driving electrode and sensing electrode in the fingerprint recognition sensor being disposed on the same layer as the first electrode layer and the second electrode layer, respectively. This display back panel has a simple structure and is easy to implement. It enables fingerprint recognition, and its fabrication requires no additional process steps or rearrangement of the internal metal traces of the display back panel. The fingerprint recognition area does not occupy space in the display area, and a narrow bezel is easily achieved.

[0006] According to an embodiment of this application, the first electrode layer is disposed on the same layer as the gate.

[0007] According to an embodiment of this application, the second electrode layer is located between the source electrode, the drain electrode, and the first electrode layer.

[0008] According to an embodiment of this application, the driving electrode is disposed in the same layer as the first electrode layer, and the sensing electrode is disposed in the same layer as the second electrode layer; or, the driving electrode is disposed in the same layer as the second electrode layer, and the sensing electrode is disposed in the same layer as the first electrode layer.

[0009] According to an embodiment of this application, one of the driving electrode and the sensing electrode is arranged along a first direction, and the other of the driving electrode and the sensing electrode is arranged along a second direction intersecting the first direction. The driving electrode and the sensing electrode have an overlapping region. The driving electrode and the sensing electrode located in the overlapping region are configured as a plurality of sensing pixel units that are spaced apart from each other. Capacitors can be formed in the sensing pixel units.

[0010] According to an embodiment of this application, the display back panel further includes a fingerprint recognition chip, and the sensing electrode is electrically connected to the fingerprint recognition chip.

[0011] According to an embodiment of this application, the sensing electrode is electrically connected to the fingerprint recognition chip via a metal lead.

[0012] In another aspect, this application provides a display panel. According to an embodiment of this application, the display panel includes the aforementioned display backplate. This display panel has a simple structure, is easy to implement, enables fingerprint recognition, and requires no additional process steps or rearrangement of the metal traces inside the display backplate during manufacturing, without occupying space in the display area. Furthermore, it facilitates the implementation of a narrow bezel.

[0013] According to an embodiment of this application, the display panel further includes an encapsulation structure. The encapsulation structure is disposed on the surface of the light-emitting element in the display back panel away from the substrate. The orthographic projection of the encapsulation structure on the substrate covers the display area and part of the non-display area. A first barrier is provided on the outer periphery of the encapsulation structure, and a second barrier is provided around the outer periphery of the non-display area. The fingerprint recognition area in the display back panel is located between the first barrier and the second barrier or between the first barrier and the display area.

[0014] According to an embodiment of this application, the fingerprint recognition area is located between the first barrier and the second barrier, and the orthographic projection of the packaging structure on the substrate covers the fingerprint recognition area.

[0015] According to an embodiment of this application, the first barrier further includes at least two sub-barriers, and the fingerprint recognition area is located between two adjacent sub-barriers.

[0016] In another aspect, this application provides a display device. According to an embodiment of this application, the display device includes the aforementioned display panel. This display device has a simple structure and is easy to implement. It enables fingerprint recognition, and its fabrication requires no additional process steps or rearrangement of the metal traces inside the display back panel. Furthermore, the fingerprint recognition area does not occupy space in the display area, and a narrow bezel is easily achieved.

[0017] In another aspect of this application, a method for fabricating the aforementioned display backplane is provided. According to an embodiment of this application, the method includes: forming a thin-film transistor array layer, a capacitor electrode layer, a light-emitting element, and a fingerprint sensor on one side of a substrate. The thin-film transistor array layer includes a gate, an active layer, and a source and a drain. The capacitor electrode layer includes a first electrode layer and a second electrode layer. The driving electrode and sensing electrode in the fingerprint sensor are formed with the first electrode layer and the second electrode layer respectively through a single patterning process. This method is simple, convenient, and easy to implement. It eliminates the need for additional process steps or rearrangement of metal traces on top of the formation of the fingerprint sensor, thus effectively fabricating the aforementioned display backplane.

[0018] According to an embodiment of this application, the driving electrode and the first electrode layer are formed by a single patterning process, and the sensing electrode and the second electrode layer are formed by a single patterning process.

[0019] According to an embodiment of this application, the driving electrode and the second electrode layer are formed by a single patterning process, and the sensing electrode and the first electrode layer are formed by a single patterning process.

[0020] According to an embodiment of this application, the method includes: forming an active layer on one side of the substrate; forming a first gate insulating layer on the side of the active layer away from the substrate; forming one of the driving electrode and the sensing electrode, the gate electrode, and the first electrode layer on the side of the first gate insulating layer away from the substrate; forming a second gate insulating layer on the side of the driving electrode and the sensing electrode, the gate electrode, and the first electrode layer away from the substrate; forming the other of the driving electrode and the sensing electrode, and the second electrode layer on the side of the second gate insulating layer away from the substrate; forming an interlayer insulating layer on the side of the other of the driving electrode and the sensing electrode and the second electrode layer away from the substrate; forming the source electrode and the drain electrode; and forming the light-emitting element on the side of the interlayer insulating layer away from the substrate, thereby obtaining the display backplate. Attached Figure Description

[0021] Figure 1 A schematic diagram of the planar structure of a display back panel according to an embodiment of this application is shown.

[0022] Figure 2a Showing Figure 1 A schematic diagram of a cross-sectional structure of the display back panel along line AA in the embodiment.

[0023] Figure 2b Showing Figure 1 Another cross-sectional view of the display back panel along line AA in the embodiment.

[0024] Figure 3 A schematic diagram of the planar structure of a fingerprint recognition sensor according to an embodiment of this application is shown.

[0025] Figure 4 The diagram shows an equivalent circuit diagram of a fingerprint recognition sensor according to an embodiment of this application when performing fingerprint recognition.

[0026] Figure 5 A flowchart illustrating a method for manufacturing a display back panel according to an embodiment of this application is shown.

[0027] Figure 6 A cross-sectional structural schematic diagram of a display panel according to an embodiment of this application is shown.

[0028] Figure 7 A cross-sectional structural schematic diagram of a display panel according to an embodiment of this application is shown.

[0029] Figure 8 A cross-sectional structural schematic diagram of a display panel according to an embodiment of this application is shown.

[0030] Figure 9 A cross-sectional structural schematic diagram of a display panel according to an embodiment of this application is shown.

[0031] Figure label:

[0032] 1: Display backplate; 10: Display area; 20: Non-display area; 21: Fingerprint recognition area; 100: Substrate; 210: Gate; 220: Active layer; 230: Source; 240: Drain; 310: First electrode layer; 320: Second electrode layer; 410: Anode; 420: Light-emitting layer; 430: Cathode; 510: Driving electrode; 520: Sensing electrode; 610: First gate insulating layer; 620: Second gate insulating layer; 630: Interlayer insulating layer; 640: Planarization layer; 650: Pixel boundary layer; 700: Packaging structure; 710: First barrier; 711: First sub-barrier; 712: Second sub-barrier; 720: Second barrier; C: Overlapping area. Detailed Implementation

[0033] The embodiments of this application are described in detail below. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0034] In one aspect of this application, a display back panel is provided. According to an embodiment of this application, referring to... Figure 1 The display back panel 1 is divided into a display area 10 and a non-display area 20 surrounding the display area 10. The non-display area 20 includes a fingerprint recognition area 21. (Refer to...) Figure 2a or Figure 2b The display back panel includes: a substrate 100; a thin-film transistor array layer disposed on one side of the substrate 100, the thin-film transistor array layer including a gate 210, an active layer 220, a source 230, and a drain 240; a capacitor electrode layer including a first electrode layer 310 and a second electrode layer 320, the first electrode layer 310 being disposed on the same layer as the gate 210, and the second electrode layer 320 being disposed on the side of the first electrode layer 310 away from the substrate 100; a light-emitting element (not shown in the figure), the light-emitting element being disposed on the side of the thin-film transistor array layer away from the substrate 100; and a fingerprint recognition sensor located in the fingerprint recognition area 21, wherein the driving electrode 510 and the sensing electrode 520 in the fingerprint recognition sensor are disposed on the same layer as the first electrode layer 310 and the second electrode layer 320, respectively. In this display back panel, since the driving electrode 510 and sensing electrode 520 of the fingerprint recognition sensor are respectively disposed on the same layer as the first electrode layer 310 and the second electrode layer 320, its structure is simple and easy to implement. It can realize fingerprint recognition, and when manufacturing based on the ability to realize fingerprint recognition, no additional process steps are required, and no re-arrangement of the metal traces inside the display back panel is required. The fingerprint recognition area 21 will not occupy the space of the display area 10, making it easy to achieve a narrow bezel. In addition, since the fingerprint recognition sensor in this application is integrated inside the display back panel, its thickness is lower than that of the fingerprint recognition sensor attached to the outside of the display device in related technologies, which is in line with the development trend of thinner and lighter display back panels and has good commercial prospects.

[0035] According to embodiments of this application, further, referring to Figure 2a and Figure 2b In some embodiments of this application, the fingerprint recognition sensor can be configured such that the driving electrode 510 is disposed on the same layer as the first electrode layer 310, and the sensing electrode 520 is disposed on the same layer as the second electrode layer 320 (see schematic diagram). Figure 2a In addition, in some other embodiments of this application, the driving electrode 510 may be disposed on the same layer as the second electrode layer 320, while the sensing electrode 520 may be disposed on the same layer as the first electrode layer 310 (see schematic diagram). Figure 2b It is understood that when the driving electrode 510 is disposed on the same layer as the second electrode layer 320, the fingerprint recognition sensor will be more sensitive to the fingerprint signal and the effect will be better during the fingerprint recognition process.

[0036] According to embodiments of this application, the specific method by which the fingerprint recognition sensor performs fingerprint recognition is not particularly limited. Specifically, in some embodiments of this application, reference is made to... Figure 3 One of the driving electrode 510 and the sensing electrode 520 is arranged along a first direction, for example, laterally, and the other of the driving electrode 510 and the sensing electrode 520 is arranged along a second direction intersecting the first direction, for example, longitudinally. (It should be noted that...) Figure 3 The diagram shows the driving electrode 510 arranged laterally and the sensing electrode 520 arranged vertically. However, those skilled in the art will understand that the driving electrode 510 can also be arranged vertically and the sensing electrode 520 laterally (details will not be elaborated further here). The first orthographic projection of the driving electrode 510 on the substrate (not shown in the figure) and the second orthographic projection of the sensing electrode 520 on the substrate have an overlapping region C (e.g., ...). Figure 3 As shown in the dashed box in the middle, that is, the driving electrode 510 and the sensing electrode 520 have an overlapping region C. The driving electrode 510 and the sensing electrode 5200 located in the overlapping region C are configured as a plurality of sensing pixel units that are spaced apart from each other. Capacitors can be formed in the sensing pixel units.

[0037] According to embodiments of this application, specifically, when a capacitor is formed in the sensing pixel unit, the fingerprint can be considered as another electrode plate of the sensing capacitor. When fingerprint recognition begins, the sensing capacitor formed between the skin on the surface of each sensing pixel unit and the electrode plate begins to charge. Because fingerprints have "ridges" and "valleys," and the distance between the "ridges" and "valleys" and the electrode plate is different, the resulting sensing capacitors are of different sizes. Consequently, after the charging process, the amount of charge stored in the capacitor will be different. During the discharge phase of the capacitor, according to the definition of capacitance, the capacitance value at the "ridge" is large, the charge is high, and the discharge is slow; the capacitance value at the "valley" is small, the charge is low, and the discharge is fast. Therefore, by comparing the discharge rates in different sensing pixel units, it is possible to determine whether the skin on the sensing pixel unit is a "ridge" or a "valley," thereby forming a fingerprint image.

[0038] More specifically, in some embodiments of this application, reference is made to Figure 4 When the fingerprint sensor performs fingerprint recognition, the driving electrode 510 provides a driving voltage, the sensing electrode 520 serves as a signal output channel, and a fixed parasitic capacitance C is formed between the driving electrode 510 and the sensing electrode 520. m When skin touches the fingerprint sensor, the skin's position can be considered as having zero potential, due to the sensing capacitance C generated by the skin in different sensing pixel units. r and C v The difference in potential between the sensing electrodes 520 and the sensing pixels indicates that the potentials on the sensing electrodes 520 will also differ in the corresponding sensing pixel units, as can be determined using the voltage divider formula. In this case, a fingerprint recognition chip (not shown in the figure) can be disposed in the display back panel described in this application, and the sensing electrodes can be electrically connected to the fingerprint recognition chip via, for example, metal leads. This allows for the detection of minute differences in potential on the sensing electrodes 520 in different sensing pixel units, thereby forming a fingerprint image.

[0039] According to the embodiments of this application, the specific type of fingerprint recognition sensor described in this application is not particularly limited. In some embodiments of this application, the fingerprint recognition sensor may be a sliding fingerprint recognition sensor, which realizes the recognition and scanning of the entire fingerprint and the reading of the signal by sliding the finger. Of course, it is understood that the fingerprint recognition sensor described in this application may also be other types of fingerprint recognition sensors, which will not be elaborated on here.

[0040] According to embodiments of this application, it is also understood that, in addition to the structures described above, the display back panel of this invention may also include other conventional structures found in conventional display back panels, for example, referring to... Figure 2a Alternatively, as shown in 2b, the display backplane may also have a first gate insulating layer 610, a second gate insulating layer 620, an interlayer insulating layer 630, a planarization layer 640, a pixel defining layer 650, etc. The light-emitting elements may specifically include an anode 410, a light-emitting layer 420, a cathode 430, etc., and their structure, materials, thickness, arrangement, and function are the same as those of the film layer in a conventional display backplane, and will not be described in detail here. In some embodiments, a passivation layer may also be included, located on the side of the planarization layer 640 away from the substrate. In some embodiments, the planarization layer 640 may be at least one layer.

[0041] In another aspect, this application provides a method for fabricating the aforementioned display backplane. According to an embodiment of this application, the method may include: forming a thin-film transistor array layer, a capacitor electrode layer, a light-emitting element, and a fingerprint sensor on one side of a substrate. The thin-film transistor array layer includes a gate, an active layer, and a source and a drain. The capacitor electrode layer includes a first electrode layer and a second electrode layer. The driving electrode and sensing electrode in the fingerprint sensor are formed with the first electrode layer and the second electrode layer respectively through a single patterning process. This method is simple, convenient, and easy to implement. It eliminates the need for additional process steps or rearrangement of metal traces on top of the formation of the fingerprint sensor, thus effectively fabricating the aforementioned display backplane.

[0042] According to embodiments of this application, further as described above, in some embodiments of this application, the driving electrode may be formed with the first electrode layer through a single patterning process, and the sensing electrode may be formed with the second electrode layer through a single patterning process, thereby the driving electrode and the first electrode layer are disposed in the same layer, and the sensing electrode and the second electrode layer are disposed in the same layer; in other embodiments of this application, the driving electrode and the second electrode layer may be formed with the second electrode layer through a single patterning process, and the sensing electrode may be formed with the first electrode layer through a single patterning process, thereby the driving electrode and the second electrode layer are disposed in the same layer, and the sensing electrode and the first electrode layer are disposed in the same layer.

[0043] According to an embodiment of this application, specifically referring to... Figure 5 This method may specifically include the following steps:

[0044] S100: The active layer is formed on one side of the substrate.

[0045] S200: A first gate insulating layer is formed on the side of the active layer away from the substrate.

[0046] S300: One of the driving electrode and the sensing electrode, the gate electrode, and the first electrode layer are formed on the side of the first gate insulating layer away from the substrate.

[0047] S400: A second gate insulating layer is formed on the side of the first electrode layer away from the substrate, in one of the driving electrode and the sensing electrode, the gate electrode.

[0048] S500: The second electrode layer, another of the driving electrode and the sensing electrode, is formed on the side of the second gate insulating layer away from the substrate.

[0049] S600: An interlayer insulating layer is formed on the side of the second electrode layer away from the substrate, which is the other of the driving electrode and the sensing electrode.

[0050] S700: Forms the source and the drain.

[0051] S800: The light-emitting element is formed on the side of the interlayer insulating layer away from the substrate, thus obtaining the display backplate.

[0052] According to embodiments of this application, specifically, the specific process conditions and parameters for each step in forming the above-mentioned active layer, first gate insulating layer, one of the driving electrode and the sensing electrode, gate, first electrode layer, second gate insulating layer, the other of the driving electrode and the sensing electrode, second electrode layer, interlayer insulating layer, source electrode, drain electrode, and light-emitting element can all be the conventional process conditions and parameters for forming this layer, and will not be elaborated further here. Therefore, the fabrication process is simple, convenient, easy to implement, and readily suitable for industrial production.

[0053] According to the embodiments of this application, it should be noted that, in addition to the steps described above, those skilled in the art will understand that the method may also include other conventional steps for forming a display back panel, etc., which will not be elaborated further here.

[0054] According to the embodiments of this application, since the first electrode layer in the capacitor electrode layer and one of the driving electrode and sensing electrode in the fingerprint recognition sensor can be formed by only one patterning process, and the second electrode layer in the capacitor electrode layer and the other of the driving electrode and sensing electrode in the fingerprint recognition sensor can also be formed by only one patterning process, the method is simple, convenient and easy to implement. It does not require additional process steps to form the fingerprint recognition sensor, and also saves the mask required to form the driving electrode and sensing electrode separately, resulting in low cost.

[0055] In another aspect, this application provides a display panel. According to an embodiment of this application, the display panel includes the aforementioned display backplate. This display panel has a simple structure, is easy to implement, enables fingerprint recognition, and the fingerprint recognition area does not occupy space in the display area. It is easy to achieve a narrow bezel and possesses all the features and advantages of the aforementioned display backplate, which will not be elaborated further here.

[0056] According to embodiments of this application, further, referring to Figure 6It is understood that the display panel may further include an encapsulation structure 700, which is disposed on the surface of the light-emitting element in the display back panel away from the substrate 100. The orthographic projection of the encapsulation structure 700 on the substrate 100 covers the display area 10 and part of the non-display area 20. A first barrier 710 is provided on the outer periphery of the encapsulation structure 700, and a second barrier 720 is provided around the outer periphery of the non-display area 20. The fingerprint recognition area 21 in the display back panel is located between the first barrier 710 and the second barrier 720 (see structural schematic diagram). Figure 6 and Figure 7 (or between the first retaining wall 710 and the display area 10 (see structural schematic diagram)) Figure 8 Therefore, the display panel has a simple and easy-to-implement structure, and the fingerprint recognition area does not occupy the space of the display area, making it easy to achieve a narrow bezel.

[0057] According to embodiments of this application, it is understood that the function of the first barrier 710 is not particularly limited. For example, in some embodiments of this application, when the display panel is an organic electroluminescent display panel, the first barrier 710 can be a barrier to prevent water and oxygen intrusion. In some embodiments, the first barrier may include at least one organic layer, such as at least one of a planarization layer 640, a pixel defining layer 650, and a passivation layer.

[0058] According to the embodiments of this application, it can be understood that the function of the second barrier 720 is not particularly limited. For example, in some embodiments of this application, the second barrier 720 can be a barrier that prevents cracks from the edge of the cutting line of the display panel to the interior when it is cut during the manufacturing process of the display panel. The specific structure 720 of the second barrier is not particularly limited. For example, it can be a structure formed by drilling holes in the inorganic layer and filling them with organic materials. Specifically, it can be a conventional structure of a barrier that plays the above-mentioned role in related technologies, which will not be described in detail here.

[0059] According to embodiments of this application, further, referring to Figure 7 When the fingerprint recognition area 21 is located between the first barrier 710 and the second barrier 720, the orthographic projection of the encapsulation structure 700 onto the substrate 100 can also cover the fingerprint recognition area 21. Therefore, this arrangement can improve the fingerprint recognition effect and extend the lifespan of the fingerprint sensor.

[0060] According to embodiments of this application, the first retaining wall may further include at least two sub-retaining walls, for example, referring to... Figure 9The first barrier includes a first sub-barrier 711 and a second sub-barrier 712, and the fingerprint recognition area 21 can also be located between two adjacent sub-barriers. Therefore, this arrangement improves fingerprint recognition performance and extends the lifespan of the fingerprint sensor. Furthermore, the arrangement of the fingerprint recognition area 21 further extends the water and oxygen intrusion path between the first sub-barrier 711 and the second sub-barrier 712, resulting in better encapsulation.

[0061] According to the embodiments of this application, it can be understood that the first barrier is not limited to including only two sub-barriers, but may include more sub-barriers. The more sub-barriers are set, the better the encapsulation effect. When multiple sub-barriers are set, it can be understood that the fingerprint recognition area 21 may also be set between any two sub-barriers, which will not be elaborated further here.

[0062] According to the embodiments of this application, in addition to the display backplate and encapsulation structure described above, the display panel may also include other necessary structures and components. Those skilled in the art can supplement and design according to the specific type and usage requirements of the display panel, which will not be elaborated further here.

[0063] In another aspect, this application provides a display device. According to an embodiment of this application, the display device includes the display panel described above. This display device has a simple structure, is easy to implement, can realize fingerprint recognition, and the fingerprint recognition area does not occupy the space of the display area. It is easy to achieve a narrow bezel and possesses all the features and advantages of the display panel described above, which will not be elaborated further here.

[0064] According to the embodiments of this application, in addition to the display panel described above, the display device may also include other necessary structures and components. Those skilled in the art can supplement and design according to the specific type and usage requirements of the display device, which will not be elaborated further here.

[0065] According to embodiments of this application, the specific type of display device is not particularly limited, such as including but not limited to mobile phones, tablets, wearable devices, game consoles, televisions, or vehicle displays.

[0066] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A display backplane, characterized by, The display backplane is divided into a display area and a non-display area surrounding the display area, the non-display area includes a fingerprint identification area, and the display backplane includes: a substrate substrate; a thin film transistor array layer provided on one side of the substrate substrate, the thin film transistor array layer includes a gate, an active layer, and a source electrode, a drain electrode; a capacitor electrode layer including a first electrode layer and a second electrode layer, the second electrode layer is provided on the side of the first electrode layer away from the substrate substrate; and a light emitting element provided on the side of the thin film transistor array layer away from the substrate substrate, a fingerprint identification sensor located in the fingerprint identification area, and a driving electrode and a sensing electrode in the fingerprint identification sensor are provided in the same layer as the first electrode layer and the second electrode layer, the first electrode layer is provided in the same layer as the gate, one of the driving electrode and the sensing electrode is arranged along a first direction, the other of the driving electrode and the sensing electrode is arranged along a second direction intersecting the first direction, the driving electrode and the sensing electrode have an overlapping area, the driving electrode and the sensing electrode located in the overlapping area are configured as a plurality of sensing pixel units arranged at intervals, and a capacitor can be formed in the sensing pixel unit.

2. The display backplane of claim 1, wherein, The second electrode layer is between the source electrode, the drain electrode and the first electrode layer.

3. The display backplane of claim 1, wherein, The driving electrode is provided in the same layer as the first electrode layer, the sensing electrode is provided in the same layer as the second electrode layer, or the driving electrode is provided in the same layer as the second electrode layer, and the sensing electrode is provided in the same layer as the first electrode layer.

4. The display backplane of claim 1, wherein, It also includes a fingerprint identification chip, and the sensing electrode is electrically connected to the fingerprint identification chip.

5. The display backplane of claim 4, wherein, The sensing electrode is electrically connected to the fingerprint identification chip through a metal lead.

6. A display panel, characterized by, It includes the display backplane of any one of claims 1-5.

7. The display panel of claim 6, wherein, It also includes a packaging structure provided on the surface of the light emitting element in the display backplane away from the substrate substrate, the orthographic projection of the packaging structure on the substrate substrate covers the display area and part of the non-display area, the outer periphery of the packaging structure is provided with a first barrier wall, and a second barrier wall is further provided around the outer periphery of the non-display area, and the fingerprint identification area in the display backplane is located between the first barrier wall and the second barrier wall or between the first barrier wall and the display area.

8. The display panel of claim 7, wherein, The fingerprint identification area is located between the first barrier wall and the second barrier wall, and the orthographic projection of the packaging structure on the substrate substrate covers the fingerprint identification area.

9. The display panel of claim 7, wherein, The first barrier wall further includes at least two sub-barrier walls, and the fingerprint identification area is located between two adjacent sub-barrier walls.

10. A display device, characterized by comprising: It includes the display panel of any one of claims 6-9.

11. A method of fabricating the display backplane of any one of claims 1-5, wherein, It includes: Forming a thin film transistor array layer, a capacitor electrode layer, a light emitting element and a fingerprint identification sensor on one side of a substrate, the thin film transistor array layer comprising a gate, an active layer and a source electrode, a drain electrode, the capacitor electrode layer comprising a first electrode layer and a second electrode layer, wherein the driving electrode and the sensing electrode in the fingerprint identification sensor are formed by a one-time patterning process with the first electrode layer and the second electrode layer respectively.

12. The method of claim 11, wherein, The driving electrode is formed by a one-time patterning process with the first electrode layer, and the sensing electrode is formed by a one-time patterning process with the second electrode layer; or the driving electrode is formed by a one-time patterning process with the second electrode layer, and the sensing electrode is formed by a one-time patterning process with the first electrode layer.

13. The method of claim 11, wherein, Comprising: Forming the active layer on one side of the substrate; Forming a first gate insulating layer on the side of the active layer away from the substrate; Forming one of the driving electrode and the sensing electrode, the gate, the first electrode layer on the side of the first gate insulating layer away from the substrate; Forming a second gate insulating layer on the side of one of the driving electrode and the sensing electrode, the gate, the first electrode layer away from the substrate; Forming the other of the driving electrode and the sensing electrode, the second electrode layer on the side of the second gate insulating layer away from the substrate; Forming an interlayer insulating layer on the side of the other of the driving electrode and the sensing electrode, the second electrode layer away from the substrate; Forming the source electrode and the drain electrode; Forming the light emitting element on the side of the interlayer insulating layer away from the substrate to obtain the display backplane.

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