A flexible display screen and a display device

Abstract

The present invention discloses a flexible display screen and a display device, comprising at least one flexible area; the flexible display screen also comprises: a base substrate; a display function layer located on the base substrate; at least one antistatic layer and a pressure sensing layer located on the side of the display function layer away from the base substrate; the antistatic layer and the pressure sensing layer are at least located in the flexible area; the flexible display screen also comprises a signal processing circuit; the signal acquisition end of the signal processing circuit is electrically connected to the pressure sensing layer; the signal output end of the signal processing circuit is electrically connected to the antistatic layer; the pressure sensing layer is used to generate a pressure sensing signal according to the bending degree of the flexible area; the signal processing circuit is used to collect the pressure sensing signal, and provide an electrical signal for neutralizing the electrostatic charge to the antistatic layer according to the pressure sensing signal, which can effectively prevent the electrostatic charge from being transmitted and accumulated to the display function layer, can effectively prevent the display screen from being damaged due to static electricity, and is beneficial to prolonging the service life of the flexible display screen.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a flexible display screen and a display device. Background Art

[0002] At this stage, as people's requirements for new styles of electronic products become more and more diversified, new display forms such as folding screens, pull-out screens, and rolling screens are gradually being developed to meet the diverse usage needs of users.

[0003] Flexible displays are prone to generate a large amount of static electricity due to frequent pulling, curling or folding during use, which can cause damage to the screen or even the entire electronic product. Summary of the invention

[0004] The invention provides a flexible display screen and a display device to solve the problem of electrostatic damage of the flexible display screen.

[0005] According to one aspect of the present invention, there is provided a bendable display screen, comprising: at least one bendable region;

[0006] The flexible display screen further comprises:

[0007] substrate substrate;

[0008] A display function layer located on the substrate;

[0009] At least one antistatic layer and a pressure sensing layer located on the side of the display function layer away from the base substrate; the antistatic layer and the pressure sensing layer are at least located in the bendable area;

[0010] The flexible display screen also includes a signal processing circuit; a signal acquisition end of the signal processing circuit is electrically connected to the pressure sensing layer; a signal output end of the signal processing circuit is electrically connected to the antistatic layer; the pressure sensing layer is used to generate a pressure sensing signal according to the degree of bending of the bendable area; the signal processing circuit is used to collect the pressure sensing signal and provide an electrical signal for neutralizing the electrostatic charge to the antistatic layer according to the pressure sensing signal.

[0011] According to another aspect of the present invention, a display device is provided, comprising the above-mentioned flexible display screen.

[0012] According to the technical solution of the embodiment of the present invention, at least one antistatic layer and a pressure sensing layer are arranged on the side of the display function layer away from the base substrate, and the antistatic layer and the pressure sensing layer are at least located in the bendable area, so that the static electricity generated on the cover plate can be prevented from being transmitted to the display function layer through the antistatic layer, and / or the static electricity generated in each film layer can be discharged through the antistatic layer. In addition, the pressure sensing layer can detect the pressure information of each film layer in the bendable area and output a pressure sensing signal, so that the signal processing circuit can control the antistatic layer to discharge the static electricity according to the pressure sensing signal, which can effectively prevent the static electricity from being transmitted and accumulated to the display function layer, thereby effectively preventing the flexible display screen from being damaged due to static electricity, and further effectively extending the service life of the flexible display screen.

[0013] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 is a schematic structural diagram of a flexible display screen provided by an embodiment of the present invention;

[0016] Figure 2 is a schematic structural diagram of another flexible display screen provided by an embodiment of the present invention;

[0017] Figure 3 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0018] Figure 4 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0019] Figure 5 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0020] Figure 6 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0021] Figure 7 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0022] Figure 8 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0023] Fig. 9 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0024] Fig.10 is a structural schematic diagram of another flexible display screen provided by an embodiment of the present invention;

[0025] Fig.11 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a product or device comprising a series of film layers or modules is not necessarily limited to those film layers or modules clearly listed, but may include other film layers or modules that are not clearly listed or inherent to these products or devices.

[0028] As introduced in the background technology, flexible display screens are prone to generate a large amount of static electricity due to frequent pulling, curling or folding during use. In particular, the cover plate and the film layer under the cover plate are prone to generate a large amount of static electricity due to friction during the deformation process. A large amount of static electricity can cause damage to the screen or even the entire electronic product.

[0029] Organic Light-Emitting Diode (OLED) display panels have the advantages of high contrast, wide viewing angle, wide color gamut, etc. Most importantly, they can be used to prepare various flexible display devices. Therefore, OLED display panels have broad application prospects in the field of flexible display screens. Taking OLED display panels as an example, when OLED display panels are used in flexible display screens, due to frequent pulling, curling or folding during use, a large amount of static electricity is easily generated in the OLED device structure and on one side of the cover, thereby damaging the screen and even the entire electronic product, affecting the service life of the OLED flexible display screen.

[0030] To solve the above problems, an embodiment of the present invention provides a flexible display screen, comprising at least one bendable area; the flexible display screen also includes: a base substrate; a display function layer located on the base substrate; at least one antistatic layer and a pressure sensing layer located on the side of the display function layer away from the base substrate; the antistatic layer and the pressure sensing layer are at least located in the bendable area; the flexible display screen also includes a signal processing circuit; the signal acquisition end of the signal processing circuit is electrically connected to the pressure sensing layer; the signal output end of the signal processing circuit is electrically connected to the antistatic layer; the pressure sensing layer is used to generate a pressure sensing signal according to the degree of bending of the bendable area; the signal processing circuit is used to collect the pressure sensing signal, and provide an electrical signal for neutralizing the electrostatic charge to the antistatic layer according to the pressure sensing signal.

[0031] By adopting the above technical scheme, at least one antistatic layer and a pressure sensing layer are arranged on the side of the display function layer away from the base substrate, and the antistatic layer and the pressure sensing layer are at least located in the bendable area. The antistatic layer can prevent the static electricity generated on the cover plate from being transmitted to the display function layer, and / or the static electricity generated in each film layer can be discharged through the antistatic layer. In addition, the pressure sensing layer can detect the pressure information of each film layer in the bendable area and output a pressure sensing signal, so that the signal processing circuit can control the antistatic layer to discharge the static electricity according to the pressure sensing signal, which can effectively prevent the static electricity from being transmitted and accumulated to the display function layer, thereby effectively preventing the flexible display screen from being damaged due to static electricity, and further effectively extending the service life of the flexible display screen.

[0032] The above is the core idea of ​​the present application. The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that, for ease of explanation, the following embodiments are all described by way of example using an OLED display as the flexible display. It is understandable that the flexible display provided by the embodiments of the present invention is not limited to the field of OLED displays, but can be applied to any feasible different types of displays.

[0034] Figure 1 is a schematic diagram of a structure of a flexible display screen provided by an embodiment of the present invention, such as Figure 1 As shown, the flexible display screen includes at least one bendable area A1; the flexible display screen also includes: a base substrate 10; a display function layer 20 located on the base substrate 10; at least one antistatic layer 30 and a pressure sensing layer 40 located on the side of the display function layer 20 away from the base substrate 10; the antistatic layer 30 and the pressure sensing layer 40 are at least located in the bendable area A1; the flexible display screen also includes a signal processing circuit 50; the signal acquisition terminal IN of the signal processing circuit 50 is electrically connected to the pressure sensing layer 40; the signal output terminal VO of the signal processing circuit 50 is electrically connected to the antistatic layer 30; the pressure sensing layer 40 is used to generate a pressure sensing signal according to the degree of bending of the bendable area A1; the signal processing circuit 50 is used to collect the pressure sensing signal, and provide an electrical signal for neutralizing the electrostatic charge to the antistatic layer 30 according to the pressure sensing signal.

[0035] Specifically, a cover plate 60 is usually provided on the side of the display function layer 20 facing away from the base substrate 10. In the bendable display screen, the cover plate 60 is preferably a flexible cover plate. Since each film layer in the bendable area A1 is prone to generate static electricity during frequent deformation, especially the cover plate 60 is prone to generate static electricity by friction with the film layer under the cover plate, in the application of the rolling screen, the cover plate 60 will also rub against the shell of the display device during the deformation process, and will also generate a large amount of static electricity. Therefore, at least one antistatic layer 30 can be provided between the display function layer 20 and the cover plate 60, so that the antistatic layer 30 can prevent the static electricity generated on the cover plate 60 from being transmitted to the display function layer 20, and / or the static electricity generated in each film layer can be discharged through the antistatic layer 30 to prevent static electricity from damaging the devices in the display screen.

[0036] In addition, the bendable display screen will generate pressure on the film layer of the bendable area A1 during the deformation process, and the pressure generated is different under different deformation amounts. For example, in the process of the bendable display screen being deformed from a straight state to a curved state, the pressure on each film layer in the bendable area A1 will gradually increase due to the compression of the space, and in the process of the bendable display screen being deformed from a curved state to a straight state, the pressure on each film layer in the bendable area A1 will gradually decrease. Therefore, a pressure sensing layer 40 may be provided at least in the bendable area A1 to detect the pressure information of the bendable area A1 through the pressure sensing layer 40. The pressure sensing layer 40 may be electrically connected to the signal acquisition terminal IN of the signal processing circuit 50, so that the pressure sensing layer 40 may output the pressure information according to the pressure information of the bendable area A1. The force sensing signal is sent to the signal processing circuit 50, so that the signal processing circuit 50 can determine whether the bendable area A1 is undergoing deformation according to the pressure sensing signal collected in real time; the output terminal VO of the signal processing circuit 50 is electrically connected to the antistatic layer 30. When the signal processing circuit 50 determines that the bendable area A1 is undergoing deformation according to the pressure sensing signal, the antistatic layer 30 can be controlled to discharge the electrostatic charge generated by the deformation, which can effectively prevent the electrostatic charge from being transmitted and accumulated in the film layer in the flexible display screen, thereby effectively preventing the flexible display screen from being damaged due to static electricity, which is beneficial to extending the service life of the flexible display screen. It can be understood that when the signal processing circuit 50 determines that the bendable area A1 has not been deformed or has been deformed to a small extent based on the pressure sensing signal, the antistatic layer 30 is controlled not to discharge the electrostatic charge. At this time, the antistatic layer 30 can shield the electrostatic charge from being transmitted to the display function layer 20, and / or "attract" the electrostatic charge on the cover plate 60, that is, the electrostatic charge on the cover plate 60 is gathered on the antistatic layer 30, so that when the signal processing circuit 50 controls the antistatic layer 30 to discharge the electrostatic charge, the "attracted" electrostatic charge is discharged.

[0037] Among them, when the signal processing circuit 50 determines that the bendable area A1 is deformed, it can be judged by the pressure sensing signal collected in real time, that is, the difference of the pressure sensing signals of adjacent signal collection cycles is greater than the preset difference, or, according to the pressure sensing signal at a certain moment, it is determined that the pressure value in the bendable area A1 exceeds the preset pressure value, then it can be determined that the bendable area is deforming or has deformed; when discharging the electrostatic charge in the antistatic layer 20, an electrical signal for neutralizing the electrostatic charge can be provided to the antistatic layer, for example, if the electrostatic charge on the antistatic layer 30 is a positive charge, a negative voltage is provided to the antistatic layer, and if the electrostatic charge on the antistatic layer 30 is a negative charge, a positive voltage is provided to the antistatic layer. The polarity of the electrostatic charge generated by the cover plate 60 of the bendable display screen when it is bent can be measured in advance through experiments, so that the signal processing circuit 50 can be set to directly provide a preset voltage to the antistatic layer when it is necessary to control the antistatic layer to discharge electrostatic charge.

[0038] It should be noted that when the flexible display screen includes only one antistatic layer 30, the Figure 1 As shown, the pressure sensing layer 40 is disposed on the side of the display function layer 20 away from the base substrate 10, and the antistatic layer 30 is disposed on the side of the pressure sensing layer 40 away from the base substrate 10. Figure 2 As shown, the antistatic layer 30 is disposed on the side of the display function layer 20 away from the base substrate 10, and the pressure sensing layer 40 is disposed on the side of the antistatic layer 30 away from the base substrate 10, which is not specifically limited in the embodiment of the present invention.

[0039] In an optional embodiment, the pressure sensing layer 40 may also be located between two adjacent insulating film layers of the flexible display screen, and at least located in the bendable area A1 of the flexible display screen, so that the pressure change caused by the deformation of the bendable area A1 can also be detected.

[0040] The flexible display screen provided by the embodiment of the present invention has at least one antistatic layer and a pressure sensing layer arranged on the side of the display function layer away from the base substrate, and the antistatic layer and the pressure sensing layer are at least located in the bendable area, so that the static electricity generated on the cover plate can be prevented from being transmitted to the display function layer through the antistatic layer, and / or the static electricity charges generated in each film layer can be discharged through the antistatic layer. In addition, the pressure sensing layer can detect the pressure information of each film layer in the bendable area and output a pressure sensing signal, so that the signal processing circuit can control the antistatic layer to discharge the static electricity charges according to the pressure sensing signal, which can effectively prevent the static electricity charges from being transmitted and accumulated to the display function layer, thereby effectively preventing the flexible display screen from being damaged due to static electricity, and further effectively extending the service life of the flexible display screen.

[0041] Optional, Figure 3 is a schematic diagram of the structure of another flexible display screen provided by an embodiment of the present invention. Figure 3 As shown, the at least one antistatic layer 30 includes a first antistatic layer 31 and a second antistatic layer 32 ; the first antistatic layer 31 and the second antistatic layer 32 are located on opposite sides of the pressure sensing layer 40 .

[0042] Specifically, the first antistatic layer 31 and the second antistatic layer 32 may be antistatic layers of the same type, for example, the first antistatic layer 31 and the second antistatic layer 32 may both be antistatic layers with a function of shielding static electricity, which can effectively prevent a large amount of static electricity generated by repeated deformation on one side of the cover plate 60 from being transmitted to the display function layer 20, thereby protecting the functional devices in the flexible display screen; or, the first antistatic layer 31 and the second antistatic layer 32 may both be antistatic layers with a function of "attracting" static electricity, that is, the static electricity charges in each film layer in the flexible display screen can be gathered in the first antistatic layer 31 and the second antistatic layer 32, so that the static electricity charges can be prevented from gathering in the display function layer 20 and thus damaging the functional devices in the display function layer 20. The first antistatic layer 31 and the second antistatic layer 32 may also be antistatic layers of different types, that is, one of the first antistatic layer 31 and the second antistatic layer 32 is an antistatic layer with a function of shielding static electricity, and the other is an antistatic layer with a function of "attracting" static electricity, so that the antistatic layer 30 can have both the function of shielding static electricity and the function of "attracting" static electricity.

[0043] Optional, continue to refer to Figure 3 When the first antistatic layer 31 and the second antistatic layer 32 are different types of antistatic layers, the first antistatic layer 31 may include an electrostatic dissipation layer EDL (Electrostatic Dissipation Layer), and the second antistatic layer 32 may include an electrostatic suppression layer ESL. The surface resistivity r1 of the electrostatic dissipation layer EDL is in the range of 1*10 5 Ω / m 2 ≤r1≤1*10 12 Ω / m 2 , or, the volume resistivity r2 of the electrostatic dissipative layer EDL is in the range of 1*10 4 Ω·cm≤r2≤1*10 11 Ω·cm; the surface resistivity r3 of the electrostatic suppression layer ESL (Electrostatic Suppression layer) ranges from 1*10 6 Ω / m 2 ≤r1≤1*10 8 Ω / m 2 .

[0044] Specifically, the surface resistivity r1 of the electrostatic dissipation layer EDL is set to a value range of 1*10 5 Ω / m2≤r1≤1*10 5 Ω / m2, or set the volume resistivity r2 to a value range of 1*10 4 Ω·cm≤r1≤1*10 11Ω·cm. It has been verified through experiments that when the above conditions are met, the electrostatic dissipative layer EDL can have good electrostatic discharge capability, and when discharging electrostatic, its discharge current will not be too large, that is, it has good current limiting capability, which is beneficial to improve the safety of the electrostatic discharge process. In addition, the surface resistivity r3 of the electrostatic suppression layer can be set to a value range of 1*10 6 Ω / m 2 ≤r1≤1*10 8 Ω / m 2 , it has been verified by experiments that when the above conditions are met, the electrostatic suppression layer ESL has good electrostatic shielding ability, which can effectively block the transmission of static electricity in the film layer in the display screen, thereby playing a role in protecting the functional devices in the display screen.

[0045] Exemplarily, when the first antistatic layer 31 includes an electrostatic dissipation layer EDL, and the second antistatic layer 32 includes an electrostatic suppression layer ESL, the first antistatic layer 31 can be arranged on the side of the pressure sensing layer 40 away from the base substrate 10, and the second antistatic layer 32 can be arranged on the side of the pressure sensing layer 40 close to the base substrate 10. In this way, the electrostatic charge on one side of the cover plate 60 can be discharged on the first antistatic layer, and the electrostatic charge on one side of the cover plate 60 can be blocked by the second antistatic layer 32 from being transmitted to the display function layer 20, which can effectively protect the functional devices in the display function layer. In addition, when the antistatic layer 30 includes the first antistatic layer 31 and the second antistatic layer 32, the signal output terminal VO of the signal processing circuit 50 can be electrically connected to the first antistatic layer 31 and the second antistatic layer 32; or, because the electrostatic dissipation layer EDL has good electrostatic discharge capability, that is, the electrostatic charge is mainly discharged through the electrostatic dissipation layer EDL, the signal output terminal VO of the signal processing circuit 50 can be arranged to be electrically connected only to the electrostatic dissipation layer EDL.

[0046] In another feasible embodiment of the present invention, an electrostatic suppression layer ESL can be arranged on the side of the pressure sensing layer 40 away from the base substrate 10, and an electrostatic dissipation layer EDL can be arranged on the side of the pressure sensing layer 40 close to the base substrate 10. At this time, the electrostatic suppression layer ESL arranged close to the cover plate 60 can block the large amount of electrostatic charges on the cover plate 60 from being transmitted to the display function layer 20. At the same time, the electrostatic dissipation layer EDL can discharge the relatively small amount of electrostatic charges existing in the display function layer 20. The embodiment of the present invention does not specifically limit the positions of the electrostatic dissipation layer EDL and the electrostatic suppression layer ESL.

[0047] Optionally, the material of the antistatic layer 30 includes at least one of polyurethane materials, aluminum-doped zinc oxide, carbon fiber, polyetheretherketone, and expanded graphite.

[0048] Specifically, the material of the antistatic layer 30 may include at least one of polyurethane materials, aluminum-doped zinc oxide, carbon fiber, polyetheretherketone, and expanded graphite, so that the antistatic layer 30 has good electrostatic dissipation capability and / or good electrostatic shielding capability.

[0049] Exemplarily, an electrostatic dissipation layer (EDL) may be provided including materials that quickly dissipate electrostatic charges on its surface and inside, including but not limited to composite coatings composed of aluminum-doped zinc oxide and carbon fiber, or polyurethane materials; an electrostatic suppression layer (ESL) may be provided including materials that generate less charge when rubbed or separated from the same material or other similar materials, including but not limited to polyetheretherketone and expanded graphite.

[0050] Optional, Figure 4 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, such as Figure 4 As shown, at least one antistatic layer 30 includes a first tooth structure 30a on one side close to the pressure sensing layer 40, and the pressure sensing layer 40 includes a second tooth structure 40a on one side close to the antistatic layer; the first tooth structure 30a and the second tooth structure 40a mesh with each other.

[0051] Specifically, since the increase in film layers will reduce the deformation ability of the flexible display screen, in order to ensure the deformation ability of the flexible display screen, a serrated structure that can engage with each other can be set on the side where the antistatic layer 30 and the pressure sensing layer 40 are close to each other, that is, the side of the antistatic layer 30 close to the pressure sensing layer 40 includes a first serrated structure 30a, and the side of the pressure sensing layer 40 close to the antistatic layer includes a second serrated structure 40a, the first serrated structure 30a and the second serrated structure 40a engage with each other, which can effectively improve the deformation ability of the flexible display screen.

[0052] It should be noted that Figure 4 The case where the flexible display includes an antistatic layer 30 is only shown by way of example. It can be understood that when the flexible display includes a first antistatic layer 31 and a second antistatic layer 32, the first antistatic layer 31 and the second antistatic layer 32 can be provided with a first tooth structure 30a on one side close to the pressure sensing layer 40. In this case, the opposite sides of the pressure sensing layer 40 are also provided with a second tooth structure 40a which meshes with the corresponding first tooth structure 30a, so as to achieve the effect of improving the deformation ability of the flexible display; or, the first tooth structure 30a can be provided only on the side close to the pressure sensing layer 40 of one of the antistatic layers 30. In this case, the second tooth structure 40a is provided corresponding to the side close to the antistatic layer 30 of the pressure sensing layer 40 so as to be able to mesh with the first tooth structure 30a, which can also achieve the effect of improving the deformation ability of the flexible display.

[0053] Optional, Figure 5 FIG. 1 is a schematic diagram of a structure of a flexible display screen provided by an embodiment of the present invention. Figure 5 As shown, the pressure sensing layer 40 includes a transparent conductive layer 41 and pressure sensing particles 42 distributed in the transparent conductive layer 41 ; the signal collection terminal IN of the signal processing circuit 50 is electrically connected to the transparent conductive layer 41 .

[0054] Specifically, the pressure sensing layer 40 may be composed of a transparent conductive layer 41 and pressure sensing particles 42 distributed in the transparent conductive layer 41. The pressure sensing particles 42 can output a pressure sensing signal according to the pressure. Usually, the pressure sensing signal is in the form of an electrical signal and is output to the acquisition terminal IN of the signal processing circuit 50 through the transparent conductive layer 41. Before preparing the pressure sensing layer 40, firstly prepare a related film layer on the base substrate 10. For example, when only one antistatic layer 30 is included, prepare the display function layer 20 on the base substrate 10 to form the pressure sensing layer 40 on the display function layer 20. Or when two antistatic layers 30 are included, prepare a second antistatic layer 42 on the side of the display function layer 20 away from the base substrate 10 to form the pressure sensing layer 40 on the second antistatic layer 42. In other embodiments, a polarizer or a color resist layer may be prepared between the second antistatic layer 42 and the display function layer 20. When preparing the pressure sensing layer 40, the conductive material and the pressure sensing particles are first mixed with a solvent to prepare a mixed solution, and then the mixed solution is sprayed onto the relevant film layer by inkjet printing. The solvent is removed through a drying process to form the pressure sensing layer 40.

[0055] Optional, reference Figure 5 The pressure sensing particles 42 include piezoelectric pressure particles 421, which are made of piezoelectric materials. When the piezoelectric sensing particles 421 are subjected to external forces, electric charges will be formed on their surfaces. The greater the external forces, the greater the amount of electric charges formed. Therefore, the piezoelectric sensing particles 421 can be used to detect the pressure on the membrane layer of the bendable area A1, and thus the degree of deformation of the bendable area A1 can be detected.

[0056] Optional, Figure 6 is a schematic diagram of the structure of another flexible display screen provided by an embodiment of the present invention, such as Figure 6 As shown, the pressure sensing particle 42 includes a piezoresistive pressure particle 422, and the resistance of the piezoresistive pressure particle 422 will change according to the change of the external force applied to it. For example, when the external force applied to the piezoresistive pressure particle 422 is greater, its resistance is smaller; or, when the external force applied to the piezoresistive pressure particle 422 is greater, its resistance is greater. The type of the piezoresistive pressure particle 422 can be selected according to the design requirements.

[0057] In other embodiments of the present invention, the pressure sensing particles 42 may include both piezoelectric pressure particles 421 and piezoresistive pressure particles 422 , which is not specifically limited in the embodiments of the present invention.

[0058] Optional, reference Figure 5 The signal processing circuit 50 includes a signal acquisition module 51, a signal amplifying module 52 and a signal output module 53; the signal acquisition module 51 is electrically connected to the pressure sensing layer 40 and the signal amplifying module 52 respectively; the signal acquisition module 51 is used to acquire the pressure sensing signal generated by the pressure sensing layer 40 and output it to the signal amplifying module 52; the signal amplifying module 52 is used to amplify the pressure sensing signal and output the amplified pressure sensing signal; the signal output module 53 is electrically connected to the signal amplifying circuit 52 and the antistatic layer 30 respectively; the signal output module 53 is used to provide an electrical signal for neutralizing the electrostatic charge to the antistatic layer 30 according to the amplified force sensing signal.

[0059] Specifically, the input end of the signal acquisition module 51 is electrically connected to the pressure sensing layer 40. When the pressure sensing layer 40 includes a transparent conductive layer 41 and pressure sensing particles 42 distributed in the transparent conductive layer 41, the input end of the signal acquisition module 51 can be electrically connected to the transparent conductive layer 41 to obtain the pressure sensing signal provided by the pressure sensing particles 42 through the transparent conductive layer 41. The output end of the signal acquisition module 51 is electrically connected to the input end of the signal amplification module 52, so that the signal acquisition module 51 can transmit the collected pressure sensing signal to the signal amplification module 52, and the output end of the signal amplification module 52 is electrically connected to the input end of the signal output module 52. The signal amplifying module 52 is electrically connected to the input end of the signal output module 53, and the signal amplifying module 52 can amplify the received pressure sensing signal to a range that can be effectively recognized and processed by the signal output module 53, so that the signal output module 53 can judge the deformation state of the bendable area A1 according to the amplified pressure sensing signal, or judge whether the bendable area A1 is deforming or has deformed according to the amplified pressure sensing signals obtained in two or several adjacent signal acquisition cycles, so that the signal output module 53 can provide an electric signal for neutralizing the electrostatic charge to the antistatic layer 30 when it is determined that the bendable area A1 is deforming or has deformed. Wherein, when the antistatic layer 30 includes the electrostatic dissipative layer EDL, the electric signal for neutralizing the electrostatic charge can be provided only to the electrostatic dissipative layer EDL.

[0060] Optional, reference Figure 6The signal processing circuit also includes: a first resistor R1, a second resistor R2 and a third resistor R3; the first resistor R1, the second resistor R2, the third resistor R3 and the pressure sensing layer 40 form a bridge circuit; the input end of the bridge circuit is electrically connected to the constant power supply E0, and the output end of the bridge circuit is electrically connected to the signal acquisition module 51; wherein the first resistor R1, the second resistor R2 and the third resistor R3 are all resistors with fixed resistance values; the pressure sensing layer 40 has different resistance values ​​when the bendable area A1 has different bending degrees.

[0061] Specifically, when the pressure sensing layer 40 includes the piezoresistive pressure particles 422, the pressure sensing layer 40 can be used as a resistor to form a bridge circuit with the first resistor R1, the second resistor R2 and the third resistor R3, that is, the pressure sensing layer 40 can be set to be connected in series with the first resistor R1 to form a series branch, and the second resistor R2 and the third resistor R3 can be connected in series to form a series branch, so that the constant power supply E0 supplies power to the two series branches, that is, the two series branches are connected in parallel. Assuming that the pressure sensing layer 40 is electrically connected to the first resistor R1 at a first node a, and the second resistor R2 and the third resistor R3 are electrically connected to the second node b, the first node a and the second node b can be used as output ends of the bridge circuit. Since the first resistor R1, the second resistor R2 and the third resistor R3 are all fixed resistances, resistance, so the potential Vb of the second node b remains constant, and the potential Va of the first node a is related to the resistance of the pressure sensing layer 40. For example, the positive electrode of the constant power supply E0 is electrically connected to the first resistor R1, and the negative electrode of the constant power supply E0 is electrically connected to the pressure sensing layer 40. Then, when the resistance of the pressure sensing layer 40 increases, the voltage across the pressure sensing layer 40 increases, that is, the potential Va of the first node a increases, thereby increasing the potential difference (Va-Vb) between the first node a and the second node b. In this way, the resistance of the pressure sensing layer 40 at this time can be determined by the potential difference (Va-Vb) between the first node a and the second node b, and then the deformation state of the bendable area A1 can be determined, so that an electrical signal for neutralizing the electrostatic charge can be further provided to the antistatic layer 30 according to the deformation state.

[0062] The above embodiments only exemplarily illustrate the setting of the signal processing circuit 50 when the pressure sensing particles 42 include piezoelectric pressure particles 41 and / or piezoresistive pressure particles 422. It can be understood that in other embodiments of the present invention, the pressure sensing particles 42 can also include other types of pressure sensing particles. In this case, the signal processing circuit can be set accordingly, and the embodiments of the present invention do not specifically limit this.

[0063] In a feasible embodiment, the pressure sensing layer 40 may also be configured in the form of a capacitor, and the deformation state of the pressure sensing layer 40 is determined by the influence of the capacitance in the pressure sensing layer 40 during the deformation process.

[0064] Figure 7is a schematic diagram of the structure of another flexible display screen provided by an embodiment of the present invention, such as Figure 7 As shown, the pressure sensing layer 40 includes a first conductive layer 43, a second conductive layer 44 and an insulating layer 45 located between the first conductive layer 43 and the second conductive layer 44; wherein the first conductive layer 43, the second conductive layer 44 and the insulating layer 45 constitute a pressure sensing capacitor.

[0065] Specifically, since the pressure sensing layer 40 is at least located in the bendable area A1, the first conductive layer 43, the second conductive layer 44 and the insulating layer 45 are preferably made of materials that can be repeatedly deformed. When the bendable display screen changes from a flat state to a bent state, the thickness of the insulating layer 45 decreases due to the pressure, that is, the distance between the first conductive layer 43 and the second conductive layer 44 decreases. According to the definition formula of capacitance: C=εS / 4πkd (where C is the capacitance value, ε is the dielectric constant of the insulating layer 45, S is the facing area of ​​the first conductive layer 43 and the second conductive layer 44, k is the electrostatic force constant, and d is the distance between the first conductive layer 43 and the second conductive layer 44), it can be seen that the capacitance of the capacitor is very related to the first conductive layer 43 and The first conductive layer 43 and the second conductive layer 44 are inversely proportional to each other, that is, when the distance d between the first conductive layer 43 and the second conductive layer 44 decreases, the capacitance between the first conductive layer 43 and the second conductive layer 44 increases. Therefore, the deformation state of the flexible display screen can be determined according to the capacitance of the pressure-sensitive capacitor composed of the first conductive layer 43, the second conductive layer 44 and the insulating layer 45. That is, the signal processing circuit can be set to include a first signal acquisition terminal IN1 and a second signal acquisition terminal IN2, which are electrically connected to the first conductive layer 43 and the second conductive layer 44 respectively. In this way, the interlayer capacitance of the first conductive layer 43 and the second conductive layer 44 can be collected, and then it can be determined whether to provide an electrical signal to neutralize the electrostatic charge to the antistatic layer 30 through the interlayer capacitance.

[0066] Optional, Figure 8 is a schematic diagram of the structure of another flexible display screen provided by an embodiment of the present invention, such as Figure 8 As shown, the display function layer 20 includes a first metal layer 21 , and the first metal layer 21 includes a power signal line; the second conductive layer 44 reuses the first metal layer 21 .

[0067] Specifically, in an OLED display screen, the display function layer 20 generally includes a driving circuit layer located on the base substrate 10, and a light-emitting element located on the driving circuit layer on the side away from the base substrate. A fixed electrode layer is generally provided on the driving circuit layer for receiving a fixed power signal, that is, a first metal layer 21 for setting a power signal line, so as to drive the light-emitting element to emit light in combination with other control signals. Since the power signal line is used to receive a fixed power signal, such as a positive power signal PVDD or a negative power signal PVEE, the first metal layer 21 for setting the power signal line in the display function layer can be reused as a second conductive layer 44, and a pressure-sensitive capacitor is formed with the first conductive layer 43 and the insulating layer 45, so that the setting of the film layer can be reduced, which is conducive to the thinness of the flexible display screen.

[0068] Optional, Fig. 9 is a schematic diagram of the structure of another flexible display screen provided by an embodiment of the present invention, such as Fig. 9 As shown, the touch function layer 70 is located on the side of the display function layer 30 away from the base substrate 10 ; the touch function layer 70 includes a touch driving layer 71 and a touch sensing layer 72 , the touch driving layer 71 includes touch driving electrodes 711 , and the touch sensing layer 72 includes touch sensing electrodes 721 .

[0069] Specifically, the flexible display screen can be a touch display screen, in which case a touch function layer 70 can be arranged on the side of the display function layer 30 away from the base substrate 10, and the touch drive layer 71 usually includes a touch drive electrode 711 arranged in a whole layer for receiving a fixed power supply signal, and the touch sensing electrode 721 in the touch sensing layer 62 is a block structure, and a touch insulating layer 73 is arranged between the touch drive layer 61 and the touch sensing layer 72, and the touch position is determined by the change in capacitance between the touch drive electrode 711 and each touch sensing electrode 721 to realize the touch function. In this case, the touch drive layer 71 with the touch drive electrode 711 can be reused as the second conductive layer 44 of the pressure-sensitive capacitor to reduce the film layer setting, which is conducive to realizing the lightweight design of the flexible display screen.

[0070] Optional, reference Fig. 9 , the touch driving layer 71 is located between the first conductive layer 43 and the touch sensing layer 72 ; the touch driving layer 71 is multiplexed as the second conductive layer 44 .

[0071] Specifically, the first conductive layer 43 and the touch sensing layer 62 may be respectively arranged on opposite sides of the touch driving layer 71, so that the touch driving layer 71 can form two independent capacitors with the first conductive layer 43 and the touch sensing layer 72 respectively, so that the capacitance of the pressure-sensing capacitor formed by the touch driving layer 71 and the first conductive layer 43 can be detected more accurately.

[0072] Optional, Fig.10is a schematic diagram of the structure of another flexible display screen provided by an embodiment of the present invention, such as Fig.10 As shown, the flexible display screen further includes: a polarizer POL or a color resist layer CF located on the side of the display function layer 20 away from the base substrate 10 .

[0073] Specifically, a polarizer POL or a color resist layer CF may be provided on the side of the display function layer 20 facing away from the base substrate 10 to prevent the film layer with a reflective function in the flexible display from reflecting the external ambient light and emitting it to the display surface of the flexible display, thereby preventing the display brightness of the flexible display from being affected, thereby improving the contrast of the flexible display.

[0074] Based on the same inventive concept, an embodiment of the present invention further provides a display device, which includes the flexible display screen provided by any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention includes the technical features of the flexible display screen provided by any embodiment of the present invention, and can achieve the beneficial effects of the flexible display screen provided by any embodiment of the present invention. The similarities can be referred to the above description of the flexible display screen provided by the embodiment of the present invention, and will not be repeated here.

[0075] Fig.11 It is a structural schematic diagram of a display device provided in an embodiment of the present invention. The display device 00 can be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, mobile phones, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc.

[0076] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible display screen, characterized in that: include: at least one bendable region; The flexible display screen further comprises: substrate substrate; A display function layer located on the substrate; At least one antistatic layer and a pressure sensing layer located on the side of the display function layer away from the base substrate; the antistatic layer and the pressure sensing layer are at least located in the bendable area; The flexible display screen also includes a signal processing circuit; a signal acquisition end of the signal processing circuit is electrically connected to the pressure sensing layer; a signal output end of the signal processing circuit is electrically connected to the antistatic layer; the pressure sensing layer is used to generate a pressure sensing signal according to the degree of bending of the bendable area; the signal processing circuit is used to collect the pressure sensing signal and provide an electrical signal for neutralizing the electrostatic charge to the antistatic layer according to the pressure sensing signal.

2. The flexible display screen according to claim 1, characterized in that: The at least one antistatic layer comprises a first antistatic layer and a second antistatic layer; The first antistatic layer and the second antistatic layer are located at two opposite sides of the pressure sensing layer.

3. The flexible display screen according to claim 2, characterized in that: The first antistatic layer comprises a static dissipative layer, and the second antistatic layer comprises a static suppressive layer; The surface resistivity r1 of the electrostatic dissipative layer is in the range of 1*10 5 Ω / m 2 ≤r1≤1*10 12 Ω / m 2 , or, the volume resistivity r2 of the electrostatic dissipative layer is in the range of 1*10 4 Ω·cm≤r2≤1*10 11 Ω·cm; The surface resistivity r3 of the electrostatic suppression layer is in the range of 1*10 6 Ω / m 2 ≤r3≤1*10 8 Ω / m 2 .

4. The flexible display screen according to claim 1, characterized in that: The material of the antistatic layer includes at least one of polyurethane materials, aluminum-doped zinc oxide, carbon fiber, polyetheretherketone, and expanded graphite.

5. The flexible display screen according to claim 1, characterized in that: At least one of the antistatic layers comprises a first tooth structure on a side close to the pressure sensing layer, and the pressure sensing layer comprises a second tooth structure on a side close to the antistatic layer; The first toothed structure and the second toothed structure mesh with each other.

6. The flexible display screen according to claim 1, characterized in that: The pressure sensing layer includes a transparent conductive layer and pressure sensing particles distributed in the transparent conductive layer; the signal collection end of the signal processing circuit is electrically connected to the transparent conductive layer.

7. The flexible display screen according to claim 6, characterized in that: The pressure sensing particles include piezoelectric pressure particles and / or piezoresistive pressure particles.

8. The flexible display screen according to claim 1, characterized in that: The signal processing circuit includes a signal acquisition module, a signal amplification module and a signal output module; The signal acquisition module is electrically connected to the pressure sensing layer and the signal amplification module respectively; the signal acquisition module is used to collect the pressure sensing signal generated by the pressure sensing layer and output it to the signal amplification module; The signal amplification module is used to amplify the pressure sensing signal and output the amplified pressure sensing signal; The signal output module is electrically connected to the signal amplifying circuit and the antistatic layer respectively; the signal output module is used to provide an electrical signal for neutralizing electrostatic charge to the antistatic layer according to the amplified force sensing signal.

9. The flexible display screen according to claim 8, characterized in that: The signal processing circuit further includes: a first resistor, a second resistor and a third resistor; The first resistor, the second resistor, the third resistor and the pressure sensing layer form a bridge circuit; the input end of the bridge circuit is electrically connected to a constant power supply, and the output end of the bridge circuit is electrically connected to the signal acquisition module; The first resistor, the second resistor and the third resistor are all resistors with fixed resistances; and the pressure sensing layer has different resistances when the bendable region has different bending degrees.

10. The flexible display screen according to claim 1, characterized in that: The pressure sensing layer comprises a first conductive layer, a second conductive layer and an insulating layer located between the first conductive layer and the second conductive layer; The first conductive layer, the second conductive layer and the insulating layer constitute a pressure-sensitive capacitor.

11. The flexible display screen according to claim 10, characterized in that: The display function layer includes a first metal layer, and the first metal layer includes a power signal line; The second conductive layer reuses the first metal layer.

12. The flexible display screen according to claim 10, characterized in that: Also includes: A touch function layer is located on a side of the display function layer away from the base substrate; the touch function layer includes a touch drive layer and a touch sensing layer, the touch drive layer includes touch drive electrodes, and the touch sensing layer includes touch sensing electrodes.

13. The flexible display screen according to claim 12, characterized in that: The touch driving layer is located between the first conductive layer and the touch sensing layer; the touch driving layer is multiplexed as the second conductive layer.

14. The flexible display screen according to claim 1, characterized in that: Also includes: A polarizer or a color resist layer is located on a side of the display function layer away from the base substrate.

15. A display device, characterized in that: The flexible display screen comprises the flexible display screen as claimed in any one of claims 1 to 14.

Images