Display panel

Abstract

The embodiment of the utility model relates to the technical field of touch display, and discloses a display panel, which comprises a substrate; a glass cover plate; the packaging layer is arranged between the substrate and the glass cover plate, and a pressure sensor used for sensing pressure applied to the glass cover plate is arranged in the packaging layer. Compared with the prior art, the display panel has the advantages that the pressure sensor is integrated in the packaging layer of the display panel, so that the packaging layer is reused as the pressure sensor, the number of film layers of the display panel can be reduced, the integration level of the display panel is improved, and the size and the weight of the display panel are reduced.

Description

Technical Field

[0001] The embodiment of the utility model relates to the field of touch display technology, and in particular to a display panel. Background Art

[0002] The development trend of display technology is to make touch display modules intelligent and thinner. Among them, realizing pressure detection on the touch panel is an important direction. Pressure detection has great application value in preventing false touches, expanding touch functions, and increasing operation modes. The existing technical solution is to independently set a touch sensing layer and a pressure detection layer outside the display panel, and to stack the display panel, the touch sensing layer and the pressure detection layer to detect the touch position through the touch sensing layer and the touch pressure through the pressure detection layer. However, the existing solution makes the entire touch display module low in integration, thicker and heavier. Utility Model Content

[0003] The purpose of the embodiments of the present utility model is to provide a display panel to solve the problems of low integration, large thickness and heavy weight of the existing touch display module.

[0004] In order to solve the above technical problems, the embodiment of the present utility model provides a display panel, comprising:

[0005] A substrate; a glass cover plate; and a packaging layer disposed between the substrate and the glass cover plate, wherein a pressure sensor for sensing the pressure applied to the glass cover plate is disposed in the packaging layer.

[0006] Optionally, the encapsulation layer includes a first buffer layer, and the first buffer layer includes a conductive polymer and piezoresistive nanoparticles.

[0007] Optionally, the encapsulation layer further includes a second buffer layer stacked with the first buffer layer, the second buffer layer includes the conductive polymer and the piezoresistive nanoparticles, and the second buffer layer and the first buffer layer together constitute a pressure sensing layer of the pressure sensor.

[0008] Optionally, it also includes a first metal layer and a second metal layer, the first buffer layer and the second buffer layer are both located between the first metal layer and the second metal layer, and the first metal layer is electrically connected to the first buffer layer, and the second metal layer is electrically connected to the second buffer layer, and the first metal layer and the second metal layer respectively constitute two electrodes of the pressure sensor.

[0009] Optionally, a third metal layer is also included. The first metal layer is located on the side of the first buffer layer away from the substrate. The third metal layer is located between the first metal layer and the glass cover and is insulated from the first metal layer. The first metal layer and the third metal layer constitute a touch sensor.

[0010] Optionally, it also includes a first sub-electrode layer and a second sub-electrode layer which are arranged in the same layer and insulated from each other, the first metal layer is located on the side of the first buffer layer away from the substrate, the first sub-electrode layer and the second sub-electrode layer are located between the first metal layer and the glass cover plate and are insulated from the first metal layer, and the first sub-electrode layer and the second sub-electrode layer constitute a touch sensor.

[0011] Optionally, it further includes a light-emitting layer located on a side of the first metal layer close to the glass cover plate, and the second metal layer also constitutes a cathode layer of the light-emitting layer.

[0012] Optionally, the packaging layer includes a first buffer layer and a second buffer layer, the second buffer layer includes a conductive polymer and / or conductive particles; the pressure sensor includes a first electrode layer and a pressure sensing layer which are stacked and arranged between the first buffer layer and the second buffer layer, and a second electrode layer which is arranged on the side of the first buffer layer or the second buffer layer facing away from the pressure sensing layer.

[0013] Optionally, the pressure sensing layer is a film layer coated or printed on the surface of the first electrode layer on a side facing the second electrode layer.

[0014] Optionally, it further includes a light-emitting layer located between the encapsulation layer and the glass cover plate, and the second electrode layer also constitutes a cathode layer of the light-emitting layer.

[0015] Optionally, the packaging layer includes a first buffer layer and a second buffer layer, and the pressure sensor is sandwiched between the first buffer layer and the second buffer layer.

[0016] Optionally, the encapsulation layer includes a first buffer layer and a second buffer layer which are stacked, and the first buffer layer and the second buffer layer both include a conductive polymer and / or conductive particles; the pressure sensor includes a pressure sensing layer, and the pressure sensing layer is a film layer coated or printed on the first buffer layer or the second buffer layer.

[0017] Optionally, it further includes an electronic measuring device electrically connected to the pressure sensor, the pressure sensor is a piezoresistive sensor, and the electronic measuring device is used to detect the resistance change of the piezoresistive sensor.

[0018] With respect to the related technologies of display panels, the utility model integrates a pressure sensor in the packaging layer of the display panel so that the packaging layer is reused as a pressure sensor, thereby reducing the number of film layers of the display panel, improving the integration of the display panel, and reducing the volume and weight of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 is a schematic diagram of the stacked structure of the display panel of the first embodiment of the utility model;

[0021] Figure 2 2 is a schematic diagram of a stacked structure of a first buffer layer and a second buffer layer of a display panel according to a first embodiment of the present utility model;

[0022] Figure 3 is a schematic diagram of the stacked structure of the pressure sensor of the display panel of the first embodiment of the utility model;

[0023] Figure 4 It is a schematic diagram of the stacked structure of the touch sensor of the display panel of the first embodiment of the utility model;

[0024] Figure 5 It is a schematic structural diagram of the light-emitting layer of the display panel of the first embodiment of the utility model;

[0025] Figure 6 is a schematic structural diagram of a cathode layer of a display panel of the first embodiment of the utility model;

[0026] Figure 7 It is a schematic diagram of a stacked structure of a display panel according to the first embodiment of the utility model;

[0027] Figure 8 This is a schematic diagram of a structure in which a touch sensor electrode layer is independently arranged in another display panel according to the first embodiment of the utility model;

[0028] Fig. 9 This is a schematic structural diagram of a common touch sensor electrode layer in another display panel of the first embodiment of the utility model;

[0029] Fig.10 It is a schematic diagram of a stacked structure of another display panel of the first embodiment of the utility model;

[0030] Fig.11It is a schematic diagram of a stacked structure of a display panel without a second buffer layer according to the first embodiment of the utility model;

[0031] Fig.12 is a schematic diagram of a stacked structure of another display panel of the first embodiment of the utility model;

[0032] Fig.13 It is a schematic diagram of the stacked structure of a display panel without an insulating layer according to the first embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, each embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in each embodiment of the utility model, many technical details are proposed in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented.

[0034] In the embodiments of the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0035] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0036] In addition, the terms "installed", "set", "provided with", "opened", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0038] When implementing its pressure detection function, existing touch display modules usually need to independently set up a touch sensing layer and a pressure detection layer, such as adding a pressure detection sensor at the bottom or around the screen. This makes the entire touch display module have problems such as low integration, large thickness and weight, which is not conducive to the miniaturization design of electronic devices equipped with the above touch display module.

[0039] In order to solve the above technical problems, an embodiment of the utility model provides a display panel, including: a substrate; a glass cover plate; an encapsulation layer arranged between the substrate and the glass cover plate, and a pressure sensor for sensing the pressure applied to the glass cover plate is arranged in the encapsulation layer.

[0040] The display panel of this embodiment integrates a pressure sensor in the encapsulation layer so that the encapsulation layer is reused as a pressure sensor, which can reduce the number of film layers of the display panel, improve the integration of the display panel, and reduce the volume and weight of the display panel.

[0041] The implementation details of the display panel of this embodiment are described in detail below. The following content is only provided for easy understanding of the implementation details and is not necessary for implementing this solution.

[0042] In this embodiment, the type of the display panel 100 is not specifically limited, and it may be an IPS (In-Plane Switching) screen, an OLED screen, a foldable, bendable flexible screen, or a non-foldable, non-bendable screen.

[0043] See also Figure 1 The display panel 100 of this embodiment includes a substrate 101, a glass cover plate 102, and a packaging layer 103 disposed between the substrate 101 and the glass cover plate 102. A pressure sensor for sensing the pressure applied to the glass cover plate 102 is disposed in the packaging layer 103.

[0044] With such configuration, the encapsulation layer 103 is reused as a pressure sensor, which can reduce the number of film layers of the display panel 100 , improve the integration of the display panel 100 , and reduce the volume and weight of the display panel 100 .

[0045] Generally, the first buffer layer in the display panel is made of an insulating material and is disposed inside the display panel to buffer the impact (such as falling, collision, etc.) received by the display panel due to various factors. Figure 2 In one embodiment of the present invention, the encapsulation layer 103 includes a first buffer layer 1031, the first buffer layer 1031 includes a conductive polymer and piezoresistive nanoparticles, and the first buffer layer 1031 constitutes a pressure sensing layer of the pressure sensor. It can be understood that the first buffer layer 1031 can be a mixture of conductive polymer and piezoresistive nanoparticles.

[0046] The first buffer layer 1031 may be a matrix of an inorganic material, in which a conductive polymer and a piezoresistive nanomaterial are doped, thereby forming a film layer having conductivity and piezoelectric effect. When pressure is applied to the glass cover plate 102, the first buffer layer 1031 may detect the pressure. In other embodiments of the present invention, the first buffer layer 1031 includes metal nanoparticles to enhance the conductivity of the first buffer layer 1031.

[0047] In the specific implementation of the present invention, the first buffer layer 1031 may also be made of an organic material as a matrix, for example, an organic insulating material as a matrix, doped with a conductive polymer and piezoresistive nanoparticles, or a conductive polymer may be directly used as the matrix of the first buffer layer 1031 and doped with piezoresistive nanoparticles.

[0048] In a specific embodiment of the utility model, the conductive polymer can be (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), polyaniline (PANI) or a mixture of the two. PEDOT:PSS has good conductivity and excellent transparency, making it suitable for display technology without hindering visual output. At the same time, its mechanical flexibility and stability under deformation make it an ideal material for flexible OLED displays. Polyaniline can be made conductive by doping and is widely used in various sensors. Its electrical properties change under mechanical stress and can be used for force sensing.

[0049] In a specific embodiment of the utility model, the piezoresistive nanoparticles may be one or more of carbon nanotubes (CNTs), graphene and metal nanoparticles. The use of the above components to form the pressure sensing layer 1022 can optimize the sensitivity and consistency of the pressure sensing layer 1022, thereby improving the accuracy and reliability of pressure detection. Among them, when carbon nanotubes are integrated into a matrix material (such as a polymer), the composite material can have piezoresistive properties. The resistance of the carbon nanotube-polymer composite material changes under mechanical deformation and can be used in force sensing. Graphene has high conductivity and mechanical strength, and can be used as a nanoparticle filler in a composite material to improve the conductivity of the composite material, and can also be used in a piezoelectric film layer. Metal nanoparticles, such as silver nanoparticles, can also be doped into a piezoresistive composite material. Under mechanical deformation, the distance between the nanoparticles will change, thereby changing the resistance of the material, which can be used for force sensing.

[0050] The internal encapsulation layer of an existing display panel is usually used to isolate external water vapor, etc., to prevent the metal film layer and devices inside the display panel from being corroded or contaminated. Figure 2 In some embodiments of the present invention, the encapsulation layer 103 may further include a second buffer layer 1032 stacked with the first buffer layer 1031, and the second buffer layer 1032 includes a conductive polymer and piezoresistive nanoparticles. It can be understood that the conductive polymer and piezoresistive nanoparticles used in the second buffer layer 1032 can be selected and arranged with reference to the above content.

[0051] Optionally, the second buffer layer 1032 may be disposed on a side of the first buffer layer 1031 facing the substrate 101 , or may be disposed on a side of the first buffer layer 1031 facing away from the substrate 101 , and the figure takes the former as an example.

[0052] In this embodiment, the first buffer layer 1031 and the second buffer layer 1032 are reused as the pressure sensing layer of the pressure sensor, which can reduce the number of internal film layers of the encapsulation layer 103, simplify the structure of the display panel 100, and reduce the difficulty of manufacturing.

[0053] See also Figure 3In some embodiments, the display panel 100 further includes a first metal layer 104 and a second metal layer 105, the first buffer layer 1031 and the second buffer layer 1032 are both located between the first metal layer 104 and the second metal layer 105, and the first metal layer 104 is electrically connected to the first buffer layer 1031, the second metal layer 105 is electrically connected to the second buffer layer 1032, and the first metal layer 104 and the second metal layer 105 constitute an electrode layer of the pressure sensor. Specifically, the first metal layer 104 is disposed on the surface of the buffer layer 1031 facing the glass cover plate 102, the first metal layer 104 and the first buffer layer 1031 are in electrical contact, the second metal layer is disposed on the surface of the second buffer layer 1032 facing the substrate 101, and the second metal layer 105 and the second buffer layer 1032 are in electrical contact.

[0054] When the pressure sensing layer composed of the first buffer layer 1031 and the second buffer layer 1032 senses the pressure applied to the glass cover plate 102, the signal it generates can be sent to the data processor of the electronic device equipped with the display panel 100 provided by the present invention through the first metal layer 104 and the second metal layer 105.

[0055] See also Figure 4 In some embodiments, the display panel 100 further includes a third metal layer 106, which is located between the first metal layer 104 and the glass cover 102 and is insulated from the first metal layer 104. The first metal layer 104 and the third metal layer 106 constitute a touch sensor. In other words, the touch sensor of the display panel 100 has an electrode layer shared with the pressure sensor, which can reduce the number of film layers inside the display panel 100, simplify the structure of the display panel 100, and reduce its weight and volume.

[0056] Continue to see Figure 4 An insulating layer 107 may be provided between the first metal layer 104 and the third metal layer 106 for electrical insulation. The insulating layer 107 may be an inorganic material film layer or an organic material film layer. The specific method may be selected according to actual conditions and is not specifically limited here.

[0057] In some other embodiments, the third metal layer 106 may also be replaced by a first sub-electrode layer and a second sub-electrode layer that are arranged on the same layer and insulated from each other. In this case, the first sub-electrode layer and the second sub-electrode layer together constitute a touch sensor, and the first metal layer 104 is no longer a common electrode layer for the touch sensor and the pressure sensor.

[0058] See also Figure 5The display panel 100 may further include a light emitting layer 108 located on the side of the first metal layer 104 close to the glass cover 102. More specifically, the light emitting layer 108 is located on the surface of the third metal layer 107 facing the glass cover 102, and the second metal layer 105 also serves as a cathode layer of the light emitting layer 108. In other words, in the display panel 100, the second metal layer 105 is reused as the pressure sensor and the electrode layer of the light emitting layer 108, further reducing the number of film layers of the display panel 100 and simplifying its internal structure.

[0059] In the specific implementation of the present invention, the type of the light-emitting layer 108 is not specifically limited, and it can be, for example, a micro-LED or an organic material light-emitting layer, preferably an organic material light-emitting layer.

[0060] See also Figure 6 The second metal layer 105 can also be an independently set electrode layer of the pressure sensor. In this case, an independent cathode layer 1081 can be set below the second metal layer 105, and an insulating layer 107 can be set between the cathode layer 1081 and the second metal layer 105 to electrically insulate the cathode layer 1081 and the second metal layer 105.

[0061] See also Figure 7 The display panel 100 is provided with a polarizer 109 on the surface of the light emitting layer 108 facing the glass cover 102. The polarizer 109 is used to filter the light emitted by the light emitting layer 108 so that the light passing through the polarizer 109 can be used normally for display.

[0062] Continue to see Figure 7 The display panel 100 may further include an optical adhesive layer 110 between the polarizer 109 and the glass cover plate 102 , and the glass cover plate 102 and the polarizer 109 may be bonded and fixed by the optical adhesive layer 110 .

[0063] See also Figure 8 and Fig. 9 In some other embodiments, the pressure sensor has an independently arranged first electrode layer 111 and a pressure sensing layer 112 , wherein the first electrode layer 111 and the pressure sensing layer 112 are sandwiched between the first buffer layer 1031 and the second buffer layer 1032 .

[0064] For example, the first buffer layer 1031 is located on the side of the second buffer layer 1031 facing the glass cover 102, the first electrode layer 111 is located on the side of the first buffer layer 1031 facing the second buffer layer 1032, and the pressure sensing layer 112 is located on the side of the first electrode layer 111 facing the second buffer layer 1032, and is in electrical contact with the first electrode layer 111. At this time, the second buffer layer 1032 may include (for example, be doped with) one or more of a conductive polymer and conductive particles, so as to be in electrical contact with the pressure sensing layer 112.

[0065] A second electrode layer 113 is disposed on the side of the second buffer layer 1032 facing the substrate 101 , and the second electrode layer 113 is in electrical contact with the second buffer layer 1032 . Thus, the first electrode layer 111 , the pressure sensing layer 112 , the second buffer layer 1032 and the second electrode layer 113 together constitute a force sensor.

[0066] For a touch sensor, it may be composed of two different metal layers that are arranged and insulated from each other, such as Figure 8 The first metal layer 104 and the third metal layer 106 in the embodiment of the present invention can also be composed of a layer having two mutually insulated sub-electrode layers, such as Fig. 9 The first metal layer 104 may include the first sub-electrode layer and the second sub-electrode layer. In this case, the number of film layers of the display panel 100 may be reduced.

[0067] The pressure sensing layer 112 may be a coating or a printed layer. For example, the conductive polymer and the piezoresistive nanoparticles may be injected or dispersed into a carrier such as ink, and then the ink may be applied to the surface of the first electrode layer 111 facing the second electrode layer 113; or, the pressure sensing layer 112 may be formed on the surface of the first electrode layer 111 facing the second electrode layer 113 by printing / printing. In this way, the thickness of the pressure sensing layer 112 may be reduced, thereby reducing the thickness and volume of the display panel 100. The pressure sensing layer 112 may also be provided on the surface of the second buffer layer 1032 facing the first electrode layer 111.

[0068] In the specific implementation of the present invention, the second electrode layer 113 can also serve as the cathode layer of the light emitting layer 108, that is, the pressure sensor and the light emitting layer 108 have a common electrode layer. By sharing the electrode layer, the number of film layers inside the display panel 100 can be reduced.

[0069] See also Fig.10 In another embodiment, the first buffer layer 1031 may include one or more of a conductive polymer and conductive particles, the pressure sensing layer 112 may be disposed on the side of the first buffer layer 1031 facing the second buffer layer 1032, and the second electrode layer 113 may be disposed on the side of the pressure sensing layer 112 facing the second buffer layer 1032. In this case, the first metal layer 104 may be used as the upper electrode of the pressure sensor, and the second electrode layer 113 may be used alone as the lower electrode of the pressure sensor, that is, the light emitting layer 108 has an independent cathode layer 1081.

[0070] For a touch sensor, it may be composed of two electrodes formed by a first metal layer 104 and a third metal layer 106, such as Fig.10As shown, the touch sensor and the pressure sensor have a common electrode. When the third metal layer 106 is composed of two mutually insulated sub-electrode layers, there is no common electrode layer between the touch sensor and the pressure sensor, and the two sub-electrode layers constitute the two electrode layers of the touch sensor.

[0071] Alternatively, the first electrode layer 111 may be retained, and the first electrode layer 111 and the second electrode layer 112 may form two electrodes of the pressure sensor, and the first metal layer 104 and the third metal layer 106 may form two electrodes of the touch sensor.

[0072] In a specific embodiment of the present invention, the pressure sensing layer 112 can be disposed in the form of a coating or a printed layer on the surface of the first buffer layer 1031 facing the second buffer layer 1032 , or on the surface of the second electrode layer 113 facing the first buffer layer 1031 .

[0073] See also Fig.11 When the encapsulation layer 103 is not provided with the second buffer layer 1032 , the second electrode layer 113 can also be reused as the cathode layer of the light-emitting layer 108 , thereby further reducing the number of film layers of the display panel 100 .

[0074] See also Fig.12 and 13 In other feasible embodiments, the pressure sensor is sandwiched between the first buffer layer 1031 and the second buffer layer 1032. For example, the pressure sensor has an independent first electrode layer 111, a pressure sensing layer 112 and a second electrode layer 113 which are stacked sequentially from the glass cover plate 102 to the substrate 101. Alternatively, the insulating layer 107 or the first buffer layer 1031 may be omitted. Fig.13 It is shown that the insulating layer 107 is omitted.

[0075] The two electrodes of the touch sensor can be configured as electrode layers having two different layers and insulated from each other. One of the two electrode layers can be an electrode layer shared with the pressure sensor, or both can be independently configured relative to the pressure sensor. Alternatively, the two electrodes of the touch sensor can be composed of two sub-electrode layers configured in the same layer and insulated from each other.

[0076] Another feasible implementation is to make the first buffer layer 1031 and the second buffer layer 1032 both contain one or more of a conductive polymer and conductive particles to form a film layer with conductive properties, and then dispose the pressure sensing layer 112 between the first buffer layer 1031 and the second buffer layer 1032 .

[0077] The first metal layer 104 is in electrical contact with the first buffer layer 1031 to serve as an upper electrode of the pressure sensor, and the cathode layer of the light emitting layer 108 is in electrical contact with the second buffer layer 1032 to serve as a lower electrode of the pressure sensor.

[0078] It can be understood that the pressure sensing layer 112 can be disposed on the first buffer layer 1031 or the second buffer layer 1032 in the form of a coating or a printed layer, and is preferably located between the first buffer layer 1031 or the second buffer layer 1032 .

[0079] In some other embodiments, the first buffer layer 1031 and the second buffer layer 1032 may be selectively set, and the setting methods of other film layers can be adaptively adjusted with reference to the above, which will not be elaborated here.

[0080] In some embodiments, the display panel 100 also includes an electronic measuring device electrically connected to the pressure sensor. Specifically, the electronic measuring device is electrically connected to the electrodes of the pressure sensor to detect the change in resistance of the pressure sensing layer 112 under the action of pressure, so as to determine whether the pressure applied to the glass cover plate 102 is a user operation, so as to avoid unexpected pressure affecting the normal display or touch function of the display panel 100.

[0081] The display panel provided by the embodiment of the utility model is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the utility model. The description of the above implementation mode is only used to help understand the idea of ​​the utility model. There may be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A display panel, comprising a substrate and a glass cover, characterized in that: A packaging layer is provided between the substrate and the glass cover plate, and a pressure sensor is provided in the packaging layer for sensing the pressure applied to the glass cover plate.

2. The display panel according to claim 1, characterized in that: The encapsulation layer includes a first buffer layer including a conductive polymer and piezoresistive nanoparticles.

3. The display panel according to claim 2, characterized in that: The packaging layer further includes a second buffer layer stacked with the first buffer layer, the second buffer layer includes the conductive polymer and piezoresistive nanoparticles, and the second buffer layer and the first buffer layer together constitute a pressure sensing layer of the pressure sensor.

4. The display panel according to claim 3, characterized in that: It also includes a first metal layer and a second metal layer. The pressure sensing layer composed of the first buffer layer and the second buffer layer is located between the first metal layer and the second metal layer. The first metal layer is electrically connected to the first buffer layer, and the second metal layer is electrically connected to the second buffer layer. The first metal layer and the second metal layer respectively constitute two electrodes of the pressure sensor.

5. The display panel according to claim 4, characterized in that: It also includes a third metal layer. The first metal layer is located on the side of the first buffer layer away from the substrate. The third metal layer is located between the first metal layer and the glass cover and is insulated from the first metal layer. The first metal layer and the third metal layer constitute a touch sensor.

6. The display panel according to claim 4, characterized in that: It also includes a first sub-electrode layer and a second sub-electrode layer which are arranged in the same layer and insulated from each other. The first metal layer is located on the side of the first buffer layer away from the substrate. The first sub-electrode layer and the second sub-electrode layer are located between the first metal layer and the glass cover plate and are insulated from the first metal layer. The first sub-electrode layer and the second sub-electrode layer constitute a touch sensor.

7. The display panel according to any one of claims 4 to 6, characterized in that: It also includes a light-emitting layer located on a side of the first metal layer close to the glass cover plate, and the second metal layer also constitutes a cathode layer of the light-emitting layer.

8. The display panel according to claim 1, characterized in that: The encapsulation layer comprises a first buffer layer and a second buffer layer, wherein the second buffer layer comprises a conductive polymer and / or conductive particles; The pressure sensor includes a first electrode layer and a pressure sensing layer which are stacked and arranged between the first buffer layer and the second buffer layer, and a second electrode layer which is arranged on a side of the second buffer layer away from the pressure sensing layer.

9. The display panel according to claim 8, characterized in that: The pressure sensing layer is a film layer coated or printed on the surface of the first electrode layer facing the second electrode layer.

10. The display panel according to claim 8 or 9, characterized in that: It also includes a light-emitting layer located between the encapsulation layer and the glass cover plate, and the second electrode layer also constitutes a cathode layer of the light-emitting layer.

11. The display panel according to claim 1, characterized in that: The packaging layer includes a first buffer layer and a second buffer layer, and the pressure sensor is sandwiched between the first buffer layer and the second buffer layer.

12. The display panel according to claim 1, characterized in that: The packaging layer includes a first buffer layer and a second buffer layer which are stacked, and the first buffer layer and the second buffer layer both include a conductive polymer and / or conductive particles; the pressure sensor includes a pressure sensing layer, and the pressure sensing layer is a film layer coated or printed on the first buffer layer or the second buffer layer.

13. The display panel according to claim 1 or 11, characterized in that: It also includes an electronic measuring device electrically connected to the pressure sensor, the pressure sensor is a piezoresistive sensor, and the electronic measuring device is used to detect the resistance change of the piezoresistive sensor.

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