Flexible display screen and curling length detection method and display device

Abstract

A flexible display screen and a method for detecting the curling length thereof, and a display device, belong to the field of display technology. The flexible display screen can be curled along a first direction, and the flexible display screen includes: a curling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate. The touch layer includes a plurality of touch channels, and the touch channels include a plurality of touch structures. The touch structures include touch electrodes and redundant electrodes filled in the touch electrodes, and the touch electrodes are insulated from the redundant electrodes. The redundant electrodes in the first touch channel of the plurality of touch channels are electrically connected, and the extension direction of the first touch channel is parallel to the first direction. The curling detection structure includes the redundant electrodes electrically connected in the first touch channel, and the curling detection structure is used to detect the curling length of the flexible display screen. Since the flexible display screen includes a curling detection structure for detecting the curling length of the flexible display screen, the present application can realize the detection of the curling length of the flexible display screen.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a flexible display screen and a method for detecting a curling length thereof, and a display device. Background Art

[0002] The roll-up screen is a flexible display screen that can be rolled up. The size of the actual display area of ​​the display device equipped with the roll-up screen can be adjusted according to the roll-up length of the roll-up screen to meet the actual display needs. In order to avoid the roll-up screen from being damaged by rolling up to the limit, it is necessary to detect the roll-up length of the roll-up screen. Summary of the invention

[0003] The present application provides a flexible display screen and a method and a display device for detecting the curling length thereof, which can detect the curling length of the flexible display screen. The technical solution of the present application is as follows:

[0004] In a first aspect, a flexible display screen is provided, wherein the flexible display screen can be rolled along a first direction, and the flexible display screen comprises: a rolling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate;

[0005] The touch layer includes a plurality of touch channels, the touch channels include a plurality of touch structures, the touch structures include touch electrodes and redundant electrodes filled in the touch electrodes, the touch electrodes are insulated from the redundant electrodes, the redundant electrodes in a first touch channel among the plurality of touch channels are electrically connected, and an extension direction of the first touch channel is parallel to the first direction;

[0006] The curling detection structure includes redundant electrodes electrically connected in the first touch channel, and the curling detection structure is used to detect the curling length of the flexible display screen.

[0007] Optionally, the curling detection structure includes: a detection chip, a detection wiring, and a detection sensor composed of redundant electrodes electrically connected in the first touch channel;

[0008] The detection wiring is electrically connected to the detection sensor and the detection chip respectively;

[0009] When the flexible display screen is rolled up along the first direction, the resistance value of the detection sensor changes with the rolling of the flexible display screen;

[0010] The detection chip is used to detect the resistance value of the detection sensor, and determine the curling length of the flexible display screen according to the resistance value of the detection sensor.

[0011] Optionally, the detection line includes a first detection line, a second detection line and a third detection line, one end of the first detection line is electrically connected to the detection sensor, the other end of the first detection line is electrically connected to one end of the second detection line and one end of the third detection line respectively, and the other end of the second detection line and the other end of the third detection line are electrically connected to the detection chip respectively;

[0012] The detection chip is used to apply a detection voltage to the detection sensor through the second detection line, receive a response voltage to the detection voltage through the third detection line, and determine a resistance value of the detection sensor according to the detection voltage and the response voltage.

[0013] Optionally, the curl detection structure further includes: a target resistor;

[0014] The target resistor is connected in series to the second detection line;

[0015] The detection chip is used to determine the resistance value of the detection sensor according to the detection voltage, the response voltage and the resistance value of the target resistor.

[0016] Optionally, determining the curling length of the flexible display screen according to the resistance value of the detection sensor includes: determining the curling length of the flexible display screen according to the resistance value of the detection sensor and a first corresponding relationship, wherein the first corresponding relationship is a corresponding relationship between the sensing resistance value and the curling length.

[0017] Optionally, the flexible display screen further includes: a touch control chip, and an isolation wiring and a plurality of touch control wirings located on the flexible display substrate;

[0018] The touch electrodes in each of the touch channels are electrically connected, and each of the plurality of touch wires is used to electrically connect the touch electrodes in one of the touch channels to the touch chip;

[0019] The isolation line is located between the detection line and the touch line, and the isolation line is used to perform signal isolation between the detection line and the touch line.

[0020] Optionally, the isolation wiring and the detection wiring are located on the same layer;

[0021] The detection trace and the detection sensor are located on the same layer, or the detection sensor is located on a side of the detection trace away from the flexible display substrate.

[0022] Optionally, the flexible display substrate includes: a flexible base substrate, and a display structure layer located on the flexible base substrate, and the touch control layer is located on a side of the display structure layer away from the flexible base substrate.

[0023] In a second aspect, a method for detecting a curling length of a flexible display screen is provided, wherein the flexible display screen can be curled along a first direction, the flexible display screen comprises a curling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate; the touch layer comprises a plurality of touch channels, the touch channels comprise a plurality of touch structures, the touch structures comprise touch electrodes and redundant electrodes filled in the touch electrodes, the touch electrodes are insulated from the redundant electrodes, the redundant electrodes in a first touch channel among the plurality of touch channels are electrically connected, the extension direction of the first touch channel is parallel to the first direction, and the curling detection structure comprises the redundant electrodes electrically connected in the first touch channel;

[0024] The method comprises: the curling detection structure detects the curling length of the flexible display screen.

[0025] Optionally, the curling detection structure includes a detection chip, a detection wiring, and a detection sensor composed of redundant electrodes electrically connected in the first touch channel, the detection wiring is electrically connected to the detection sensor and the detection chip respectively, and the resistance value of the detection sensor changes with the curling of the flexible display screen; the curling detection structure detects the curling length of the flexible display screen, including:

[0026] The detection chip detects the resistance value of the detection sensor;

[0027] The detection chip determines the curling length of the flexible display screen according to the resistance value of the detection sensor.

[0028] Optionally, the detection line includes a first detection line, a second detection line and a third detection line, one end of the first detection line is electrically connected to the detection sensor, the other end of the first detection line is electrically connected to one end of the second detection line and one end of the third detection line respectively, and the other end of the second detection line and the other end of the third detection line are electrically connected to the detection chip respectively; the detection chip detects the resistance value of the detection sensor, including:

[0029] The detection chip applies a detection voltage to the detection sensor through the second detection wiring;

[0030] The detection chip receives a response voltage of the detection voltage through the third detection line;

[0031] The detection chip determines the resistance value of the detection sensor according to the detection voltage and the response voltage.

[0032] Optionally, the curl detection structure also includes a target resistor, which is connected in series to the second detection line, and the detection chip determines the resistance value of the detection sensor according to the detection voltage and the response voltage, including: the detection chip determines the resistance value of the detection sensor according to the detection voltage, the response voltage and the resistance value of the target resistor.

[0033] Optionally, determining the curling length of the flexible display screen according to the resistance value of the detection sensor includes: determining the curling length of the flexible display screen according to the resistance value of the detection sensor and a first corresponding relationship, wherein the first corresponding relationship is a corresponding relationship between the sensing resistance value and the curling length.

[0034] In a third aspect, a display device is provided, comprising: the flexible display screen described in the first aspect or any optional implementation of the first aspect.

[0035] The beneficial effects of the technical solution provided by this application are:

[0036] The present application provides a flexible display screen and a method for detecting the curling length thereof, and a display device. The flexible display screen can be curled along a first direction, and the flexible display screen includes a curling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate. The redundant electrodes in the first touch channel among the multiple touch channels are electrically connected, and the extension direction of the first touch channel is parallel to the first direction. The curling detection structure includes redundant electrodes electrically connected in the first touch channel, and the curling detection structure is used to detect the curling length of the flexible display screen. Since the flexible display screen includes a curling detection structure for detecting the curling length of the flexible display screen, the curling length of the flexible display screen can be detected, which helps to prevent the flexible display screen from curling to the limit and damaging the flexible display screen.

[0037] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a front view of a flexible display screen provided in an embodiment of the present application;

[0040] Figure 2 yes Figure 1 A cross-sectional view of the AA portion of the flexible display shown;

[0041] Figure 3 is an equivalent circuit diagram of a curling detection structure provided in an embodiment of the present application;

[0042] Figure 4 yes Figure 1 A cross-sectional view of the CC portion of the flexible display shown;

[0043] Figure 5 is a cross-sectional view of another flexible display screen provided in an embodiment of the present application;

[0044] Figure 6 yes Figure 1 A cross-sectional view of the BB portion of the flexible display shown;

[0045] Figure 7 It is a flow chart of a method for detecting the curling length of a flexible display screen provided in an embodiment of the present application;

[0046] Figure 8 is a flow chart of a method for manufacturing a flexible display screen provided in an embodiment of the present application;

[0047] Fig. 9 is a structural schematic diagram of a flexible display substrate provided in an embodiment of the present application;

[0048] Fig.10 It is a schematic diagram of a touch layer formed on a flexible display substrate provided in an embodiment of the present application;

[0049] Fig.11 This is a schematic diagram of a method provided by an embodiment of the present application after a first insulating layer is formed on a side of the touch layer away from the flexible display substrate;

[0050] Fig.12 This is a schematic diagram of an embodiment of the present application after a bridge line is formed on a side of the first insulating layer away from the flexible display substrate.

[0051] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0053] The roll-up screen is a flexible display screen that can be rolled up. The size of the actual display area of ​​the display device equipped with the roll-up screen can be adjusted according to the roll-up length of the roll-up screen. For example, when the roll-up screen of the display device is fully unfolded, the large-screen mode of the display device can be turned on to give the user a better visual experience. However, the roll-up screen is prone to damage when it is rolled up to the limit. Therefore, in order to avoid damage to the roll-up screen when it is rolled up to the limit, it is necessary to detect the roll-up length of the roll-up screen.

[0054] The embodiment of the present application provides a flexible display screen and a method for detecting the curling length thereof, and a display device. The flexible display screen includes a curling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate. The redundant electrodes in the first touch channel in the touch layer are electrically connected. The curling detection structure includes redundant electrodes electrically connected in the first touch channel. The curling detection structure is used to detect the curling length of the flexible display screen. Since the flexible display screen includes a curling detection structure for detecting the curling length of the flexible display screen, the curling length of the flexible display screen can be detected, which helps to prevent the flexible display screen from curling to the limit and damaging the flexible display screen.

[0055] The following describes the embodiments of the present application in conjunction with the accompanying drawings. First, an embodiment of a flexible display screen is described.

[0056] Figure 1 is a front view of a flexible display screen provided in an embodiment of the present application, Figure 2 yes Figure 1 The cross-sectional view of the AA portion of the flexible display is shown. Please refer to Figure 1 and Figure 2, the flexible display screen can be curled along a first direction x. The flexible display screen includes: a curling detection structure 01, a flexible display substrate 02, and a touch layer 03 located on the flexible display substrate 02. The touch layer 03 includes a plurality of touch channels, each of which includes a plurality of touch structures 031, each of which includes a touch electrode 0311 and a redundant electrode 0312 filled in the touch electrode 0311, and the touch electrode 0311 is insulated from the redundant electrode 0312. The redundant electrode 0312 in the first touch channel of the plurality of touch channels is electrically connected, and the extension direction of the first touch channel is parallel to the first direction x. The curling detection structure 01 includes the redundant electrode 0312 electrically connected in the first touch channel, and the curling detection structure 01 is used to detect the curling length of the flexible display screen.

[0057] In summary, in the flexible display provided by the embodiment of the present application, the redundant electrodes in the first touch channel in the touch layer of the flexible display are electrically connected, the flexible display includes a curling detection structure, the curling detection structure includes the redundant electrodes electrically connected in the first touch channel, and the curling detection structure can detect the curling length of the flexible display. Since the flexible display includes the curling detection structure for detecting the curling length of the flexible display, the curling length of the flexible display can be detected, which helps to prevent the flexible display from curling to the limit and damaging the flexible display.

[0058] Combination Figure 1 and Figure 2 , the multiple touch channels in the touch layer 03 include at least one transmitting channel 03T and at least one receiving channel 03R. The touch electrode 0311 in the transmitting channel 03T is a transmitting electrode 0311T, and the touch electrode 0311 in the receiving channel 03R is a receiving electrode 0311R. Both the transmitting electrode 0311T and the receiving electrode 0311R are filled with redundant electrodes 0312. When the touch layer 03 includes multiple transmitting channels 03T, the extension directions of the multiple transmitting channels 03T are parallel, and when the touch layer 03 includes multiple receiving channels 03R, the extension directions of the multiple receiving channels 03R are parallel. The extension direction of the transmitting channel 03T may intersect with the extension direction of the receiving channel 03R. For example, the extension direction of the transmitting channel 03T is perpendicular to the extension direction of the receiving channel 03R. Optionally, the extending direction of the transmitting channel 03T is parallel to the first direction x, the extending direction of the receiving channel 03R is perpendicular to the first direction x, the first touch channel may be the transmitting channel 03T, and the number of the first touch channels may be one or more. Figure 1 As shown, the first touch channel is the first emission channel 03T in the touch layer 03 , and the first emission channel 03T may be an emission channel 03T located at the edge of the touch layer 03 . Figure 1As just one example of the present application, in other embodiments, the flexible display screen may also be curled along a second direction different from the first direction, for example, the second direction is perpendicular to the first direction x. When the second direction is perpendicular to the first direction x, the first touch channel may also include a receiving channel in the touch layer, for example, the first touch channel includes the first receiving channel in the touch layer.

[0059] like Figure 1 As shown, the curling detection structure 01 includes a detection chip 011, a detection trace 012, and a detection sensor ( Figure 1 The detection trace 012 is electrically connected to the detection sensor and the detection chip 011 respectively. When the flexible display screen is rolled along the first direction x, the resistance value of the detection sensor changes with the rolling of the flexible display screen. The detection chip 011 is used to detect the resistance value of the detection sensor and determine the rolling length of the flexible display screen according to the resistance value of the detection sensor.

[0060] like Figure 1 As shown, the detection trace 012 includes a first detection trace 0121, a second detection trace 0122, and a third detection trace 0123. One end of the first detection trace 0121 is electrically connected to the detection sensor, and the other end of the first detection trace 0121 is electrically connected to one end of the second detection trace 0122 and one end of the third detection trace 0123, respectively. The other end of the second detection trace 0122 and the other end of the third detection trace 0123 are electrically connected to the detection chip 011. The detection chip 011 is used to apply a detection voltage to the detection sensor through the second detection trace 0121, and receive a response voltage of the detection voltage through the third detection trace 0122, and determine the resistance value of the detection sensor according to the detection voltage and the response voltage.

[0061] Optionally, the connection point between the second detection line 0122 and the detection chip 011 is a pressure point, and the connection point between the third detection line 0123 and the detection chip 011 is a pressure measuring point. The detection chip 011 can apply a detection voltage to the second detection line 0122 through the pressure point, and the detection voltage applied to the second detection line 0122 is transmitted to the detection sensor through the first detection line 0121 to apply the detection voltage to the detection sensor. After the detection chip 011 applies the detection voltage to the detection sensor, the detection chip 011 detects the response voltage of the detection voltage through the pressure measuring point. Usually, if the flexible display screen is not curled, the resistance value of the detection sensor is constant, and when the detection voltage is constant, the response voltage of the detection voltage is constant. If the flexible display screen is curled, the resistance value of the detection sensor will change, and even if the detection voltage is constant, the response voltage of the detection voltage will change with the change of the resistance value of the detection sensor, so the resistance value of the detection sensor can be determined according to the detection voltage and the response voltage.

[0062] like Figure 1 As shown, the curling detection structure 01 also includes a target resistor 013. The target resistor 013 is connected in series to the second detection wiring 0122. For example, the second detection wiring 0122 includes two wiring segments, one end of one of the two wiring segments is electrically connected to the other end of the first detection wiring 0121, the other end of the one wiring segment is electrically connected to one end of the target resistor 013, one end of the other of the two wiring segments is electrically connected to the other end of the target resistor 013, and the other end of the other wiring segment is electrically connected to the detection chip 011, so that the target resistor 013 can be connected in series to the second detection wiring 0122. Among them, the detection chip 011 is used to determine the resistance value of the detection sensor according to the detection voltage, the response voltage of the detection voltage and the resistance value of the target resistor 013. The resistance value of the target resistor 013 is usually a fixed value, and the resistance value of the target resistor 013 can be equal to the resistance value of the detection sensor when the flexible display screen is not curled. Optionally, the detection chip 011 uses the formula V1=R1×V according to the detection voltage, the response voltage of the detection voltage and the resistance value of the target resistor 013. ref / (R1+R2) determines the resistance value of the detection sensor. In this formula, V ref is the detection voltage, V1 is the response voltage of the detection voltage, R2 is the resistance value of the target resistor 013, R1 is the resistance value of the detection sensor, V ref , V1 and R2 are all known numbers, and R1 is an unknown number.

[0063] For examples, please refer to Figure 3 , Figure 3The equivalent circuit diagram of a curling detection structure 01 provided in an embodiment of the present application is shown. The equivalent circuit diagram includes a target resistor 013 and an equivalent resistor 014 of a detection sensor, and the target resistor 013 and the equivalent resistor 014 are connected in series to form a voltage divider circuit. Figure 1 and Figure 3 , the detection chip 011 can apply a detection voltage to the second detection line 0122 through the pressure point P1, and the detection voltage applied to the second detection line 0122 is transmitted to the detection sensor through the target resistor 013 and the first detection line 0121 in sequence to apply the detection voltage to the detection sensor. The detection chip 011 can detect the response voltage of the detection voltage through the pressure point P2.

[0064] In an optional embodiment, the detection chip 011 is used to determine the curling length of the flexible display screen according to the resistance value of the detection sensor and the first corresponding relationship. Among them, the first corresponding relationship is the corresponding relationship between the induced resistance value and the curling length, and the first corresponding relationship is the corresponding relationship between the resistance value of the detection sensor and the curling length of the flexible display screen obtained by testing the flexible display screen before the flexible display screen leaves the factory. Before the flexible display screen leaves the factory, the flexible display screen can be curled along the first direction x, and in the process of curling the flexible display screen along the first direction x, the resistance value of the detection sensor (i.e., the induced resistance value) and the curling length of the flexible display screen are observed to obtain the induced resistance value corresponding to each curling length, and the first corresponding relationship is obtained based on multiple curling lengths and the induced resistance value corresponding to each curling length, and the first corresponding relationship is recorded into the detection chip 011. Optionally, the first corresponding relationship is a one-to-one corresponding relationship between the induced resistance value and the curling length (i.e., the first corresponding relationship is a corresponding table), or it can be a function with the induced resistance value as an independent variable and the curling length as a dependent variable. The embodiment of the present application does not limit the expression form of the first corresponding relationship. When the first corresponding relationship is a one-to-one corresponding relationship between the sensing resistance value and the curling length, the detection chip 011 can query the first corresponding relationship according to the detected resistance value of the detection sensor to obtain the curling length of the flexible display screen. When the first corresponding relationship is a function with the sensing resistance value as the independent variable and the curling length as the dependent variable, the detection chip 011 can output the detected resistance value of the detection sensor to the function to calculate the curling length of the flexible display screen.

[0065] In the embodiments of the present application, Figure 1 As shown, the detection sensor has an end close to the detection chip 011 and an end away from the detection chip 011, and the end of the detection sensor away from the detection chip 011 is electrically connected to the first detection wiring 0121, or the end of the detection sensor close to the detection chip 011 is electrically connected to the first detection wiring 0121. Figure 1Take the electrical connection between one end of the detection sensor away from the detection chip 011 and the first detection trace 0121 as an example. All redundant electrodes 0312 in the first touch channel are electrically connected, and every two adjacent redundant electrodes 0312 in the first touch channel are electrically connected through a bridge line 04. The redundant electrodes 0312 in the first touch channel and the bridge line 04 used to connect these redundant electrodes 0312 together constitute a detection sensor. Among them, the bridge line 04 and the redundant electrode 0312 are located in different layers. For example, the bridge line 04 is located on the side of the redundant electrode 0312 away from the flexible display substrate 02, or the redundant electrode 0312 is located on the side of the bridge line 04 away from the flexible display substrate 02. The embodiment of the present application is described by taking the bridge line 04 located on the side of the redundant electrode 0312 away from the flexible display substrate 02 as an example.

[0066] like Figure 2 As shown, the touch layer 03 includes a touch structure 031, and the touch structure 031 includes a touch electrode 0311 (including a transmitting electrode 0311T and a receiving electrode 0311R) and a redundant electrode 0312 filled in the touch electrode 0311. There is a gap between the redundant electrode 0312 and the touch electrode 0311. The bridge line 04 is located on the side of the redundant electrode 0312 away from the flexible display substrate 02, and the bridge line 04 is electrically connected to two adjacent redundant electrodes 0312. In an optional embodiment, the flexible display screen also includes a first insulating layer 05 located on the side of the touch layer 03 away from the flexible display substrate 02. The first insulating layer 05 partially fills the gap between the redundant electrode 0312 and the touch electrode 0311, so that the touch electrode 0311 is insulated from the redundant electrode 0312. The bridge line 04 is located on the side of the first insulating layer 05 away from the flexible display substrate 02, and the first insulating layer 05 has bridge holes ( Figure 2 The bridge line 04 electrically connects the two adjacent redundant electrodes 0312 through the bridge holes corresponding to the two adjacent redundant electrodes 0312. The materials of the redundant electrodes 0312, the touch electrodes 0311, and the bridge line 04 may be the same or different. For example, the redundant electrodes 0312, the touch electrodes 0311, and the bridge line 04 are all transparent structures made of indium tin oxide (ITO).

[0067] In an optional embodiment, the flexible display screen further includes a touch control chip, and an isolation trace 07 and a plurality of touch control traces 08 located on the flexible display substrate 02. The touch control chip and the detection chip 011 may be the same chip or different chips. Figure 1Take the touch chip and the detection chip 011 as an example. The touch electrodes 0311 in each touch channel of the flexible display are electrically connected, and each of the multiple touch traces 08 is used to electrically connect the touch electrode 0311 in a touch channel to the touch chip 011. The isolation trace 07 is located between the detection trace 012 and the touch trace 08, and the isolation trace 07 is used to isolate the signal between the detection trace 012 and the touch trace 08. For example, when there are electrical signals transmitted in both the detection trace 012 and the touch trace 08, since the isolation trace 07 is located between the detection trace 012 and the touch trace 08, the electrical signal in the detection trace 012 affects the isolation trace 07 more, and the isolation trace 07 can shield the electrical signal in the detection trace 012 to prevent the electrical signal in the detection trace 012 from affecting the electrical signal in the touch trace 08. Similarly, the electrical signal in the touch wiring 08 affects the isolation wiring 07 more, and the isolation wiring 07 can shield the electrical signal in the touch wiring 08 to prevent the electrical signal in the touch wiring 08 from affecting the electrical signal in the detection wiring 012. That is, the present application sets the isolation wiring 07 between the detection wiring 012 and the touch wiring 08 to prevent the electrical signal in the detection wiring 012 from affecting the electrical signal in the touch wiring 08. Among them, the isolation wiring 07 and the detection wiring 012 are located in the same layer (the first detection wiring 0121, the second detection wiring 0122 and the third detection wiring 0123 are located in the same layer), the detection wiring 012 and the detection sensor (for example, the redundant electrode 0312 included in the detection sensor) can be located in the same layer, or the detection wiring 012 and the detection sensor (for example, the redundant electrode 0312 included in the detection sensor) are located in different layers. For example, the detection sensor (eg, the redundant electrode 0312 included in the detection sensor) is located at a side of the detection trace 012 away from the flexible display substrate 02 .

[0068] For examples, please refer to Figure 4 and Figure 5 , Figure 4 and Figure 5 Shown are cross-sectional views of two flexible display screens provided in embodiments of the present application. Figure 4 Can be Figure 1 The cross-sectional view of the CC portion of the flexible display shown in FIG. Figure 4 As shown, the isolation line 07 and the first detection line 0121 are located on the same layer, and the first detection line 0121 and the redundant electrode 0312 are located on the same layer, that is, the isolation line 07, the first detection line 0121 and the redundant electrode 0312 are located on the same layer. Figure 5As shown, the isolation line 07 and the first detection line 0121 are located in the same layer, and the redundant electrode 0312 is located on the side of the first detection line 0121 away from the flexible display substrate 02. When the detection line 012 and the redundant electrode 0312 are located in different layers, as shown in FIG. Figure 5 As shown in FIG. 1 , the flexible display screen further includes a second insulating layer 11 located between the detection wiring 012 and the redundant electrode 0312 to insulate the detection wiring 012 from the redundant electrode 0312. Figure 4 and Figure 5 As shown, the redundant electrode 0312 , the receiving electrode 0311R, and the receiving trace 08R are all located in the touch layer 03 .

[0069] As mentioned above, the touch channel includes a transmitting channel 03T and a receiving channel 03R, and the touch electrode 0311 includes a transmitting electrode 0311T located in the transmitting channel 03T and a receiving electrode 0311R located in the receiving channel 03R. In the embodiment of the present application, according to the type of the touch electrode 0311 connected to the touch trace 08, the touch trace 08 may include a transmitting trace 08T and a receiving trace 08R, the transmitting trace 08T electrically connects the transmitting electrode 0311T in the transmitting channel 03T with the touch chip, and the receiving trace 08R electrically connects the receiving electrode 0311R in the receiving channel 03R with the touch chip. Figure 1 As shown, all the transmitting electrodes 0311T in each transmitting channel 03T are electrically connected, and every two adjacent transmitting electrodes 0311T in the transmitting channel 03T are electrically connected through the transmitting electrode connecting line 09, and all the receiving electrodes 0311R in each receiving channel 03R are electrically connected, and every two adjacent receiving electrodes 0311R in the receiving channel 03R are electrically connected through the receiving electrode connecting line 10. Among them, the transmitting electrode 0311T and the receiving electrode 0311R are located in the same layer, and one of the transmitting electrode connecting line 09 and the receiving electrode connecting line 10 is located in the same layer as the transmitting electrode 0311T, and the other connecting line is located in a different layer from the transmitting electrode 0311T. For example, the transmitting electrode 0311T, the receiving electrode 0311R and the receiving electrode connecting line 10 are located in the same layer, and the transmitting electrode connecting line 09 is located on the side of the transmitting electrode 0311T away from the flexible display substrate 02. In the embodiment of the present application, the transmitting electrode 0311T, the receiving electrode 0311R, the redundant electrode 0312 and the receiving electrode connecting line 10 are located in the same layer, and the transmitting electrode connecting line 09 is located on the side of the transmitting electrode 0311T away from the flexible display substrate 02 as an example.

[0070] For example, Figure 6 yes Figure 1 The cross-sectional view of the BB portion of the flexible display is shown. Figure 2 , Figures 4 to 6, the transmitting electrode 0311T, the receiving electrode 0311R and the receiving electrode connection line 10 are all located in the touch layer 03, the transmitting electrode connection line 09 is located on the side of the transmitting electrode 0311T away from the flexible display substrate 02, and the transmitting electrode connection line 09 and the bridge line 04 are located in the same layer. The material of the transmitting electrode connection line 09 and the material of the receiving electrode connection line 10 can be the same as the material of the touch electrode 0311, for example, the material of the transmitting electrode connection line 09 and the material of the receiving electrode connection line 10 are both ITO.

[0071] Please continue to refer to Figure 2 , Figures 4 to 6 The flexible display screen further includes a protective layer 06 located on the side of the bridge line 04 away from the flexible display substrate 02. The protective layer 06 can be a whole layer structure, and the protective layer 06 covers all or part of the structure below it, and the protective layer 06 is used to provide protection for the structure below it.

[0072] Optionally, the flexible display substrate 02 includes: a flexible substrate 021, and a display structure layer 022 located on the flexible substrate 021. The touch layer 03 is located on a side of the display structure layer 022 away from the flexible substrate 021. The display structure layer 022 includes a plurality of sub-pixels ( Figure 2 , Figure 4 and Figure 5 (not shown in the figure), each sub-pixel includes a switching unit and a light-emitting unit, and the switching unit is connected to the light-emitting unit to control the light-emitting unit to emit light. Among them, the switching unit can be a thin film transistor (Thin Film Transistor, TFT), and the switching unit includes a gate, a gate insulating layer, an active layer, an interlayer insulating layer (Inter-Layer Dielectric, ILD), a source and a drain. The light-emitting unit can be an electroluminescent unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED), and the light-emitting unit includes an anode, a light-emitting layer and a cathode stacked in sequence. The anode of the light-emitting unit is connected to the drain of the TFT.

[0073] Optionally, the flexible display substrate 02 further includes: an encapsulation structure 023 located on a side of the display structure layer 022 away from the flexible substrate 021. The touch layer 03 is located on a side of the encapsulation structure 023 away from the flexible substrate 021, and the encapsulation structure 023 is used to encapsulate the display structure layer 022 to prevent external water and oxygen from entering the display structure layer 022 to corrode the light-emitting unit. The encapsulation structure 023 may be a thin film encapsulation structure, which includes inorganic layers and organic layers alternately stacked, for example, the encapsulation structure 023 includes a first inorganic layer, an organic layer, and a second inorganic layer sequentially stacked in a direction away from the flexible substrate 021.

[0074] Figures 1 to 6 This is only an example of the flexible display screen provided in the embodiment of the present application, and does not constitute a structural limitation on the flexible display screen. In practical applications, the structure of the flexible display screen can be adjusted as needed. For example, Figure 1 For simplicity, the detection chip 011 is drawn on the flexible display substrate 02. In practical applications, the detection chip 011 can be located on a circuit board of a flexible display screen, which is usually bound to the flexible display screen. The circuit board can be a flexible printed circuit (FPC) or a printed circuit board (PCB), which is not limited in the present embodiment.

[0075] In summary, in the flexible display provided by the embodiment of the present application, the redundant electrodes in the first touch channel in the touch layer of the flexible display are electrically connected, the flexible display includes a curling detection structure, the curling detection structure includes the redundant electrodes electrically connected in the first touch channel, and the curling detection structure can detect the curling length of the flexible display. Since the flexible display includes the curling detection structure for detecting the curling length of the flexible display, the curling length of the flexible display can be detected, which helps to prevent the flexible display from curling to the limit and damaging the flexible display.

[0076] The above is an introduction to the flexible display screen provided in the embodiment of the present application. The following is an introduction to a method for detecting the curling length of the flexible display screen.

[0077] As mentioned above, the flexible display screen can be rolled along a first direction, and the flexible display screen includes a rolling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate; the touch layer includes a plurality of touch channels, the touch channels include a plurality of touch structures, the touch structures include touch electrodes and redundant electrodes filled in the touch electrodes, the touch electrodes are insulated from the redundant electrodes, the redundant electrodes in the first touch channel among the plurality of touch channels are electrically connected, the extension direction of the first touch channel is parallel to the first direction, and the rolling detection structure includes the redundant electrodes electrically connected in the first touch channel. Based on this structure of the flexible display screen, the detection method includes: the rolling detection structure detects the rolling length of the flexible display screen.

[0078] Optionally, the curling detection structure includes a detection chip, a detection wiring, and a detection sensor composed of redundant electrodes electrically connected in the first touch channel, the detection wiring is electrically connected to the detection sensor and the detection chip respectively, and the resistance value of the detection sensor changes with the curling of the flexible display screen. The curling detection structure detects the curling length of the flexible display screen, including: the detection chip detects the resistance value of the detection sensor. The detection chip determines the curling length of the flexible display screen according to the resistance value of the detection sensor.

[0079] The following introduces the process of the detection chip detecting the resistance value of the detection sensor and the process of the detection chip determining the curling length of the flexible display screen according to the resistance value of the detection sensor respectively in conjunction with the flow chart.

[0080] For examples, please refer to Figure 7 , which shows a flow chart of a method for detecting the curling length of a flexible display screen provided in an embodiment of the present application, see Figure 7 , the method may include the following steps:

[0081] In step 701, the detection chip applies a detection voltage to the detection sensor through the second detection trace.

[0082] like Figure 1 As shown, the detection trace 012 includes a first detection trace 0121, a second detection trace 0122, and a third detection trace 0123. One end of the first detection trace 0121 is electrically connected to the detection sensor, and the other end of the first detection trace 0121 is electrically connected to one end of the second detection trace 0122 and one end of the third detection trace 0123, respectively. The other end of the second detection trace 0122 and the other end of the third detection trace 0123 are electrically connected to the detection chip 011. The connection point between the second detection trace 0122 and the detection chip 011 is a pressure point. The detection chip 011 can apply a detection voltage to the second detection trace 0122 through the pressure point. The detection voltage applied to the second detection trace 0122 is transmitted to the detection sensor through the first detection trace 0121 to apply the detection voltage to the detection sensor. The curling detection structure further includes a target resistor 013 connected in series to the second detection trace 0122 . Therefore, the detection chip 011 applies a detection voltage to the second detection trace 0122 through a pressure point, which is then transmitted to the detection sensor through the target resistor 013 and the first detection trace 0121 .

[0083] In step 702, the detection chip receives a response voltage of the detection voltage through a third detection line.

[0084] After the detection chip 011 applies the detection voltage to the detection sensor, the response voltage of the detection voltage can be detected through the third detection line 0123. For example, the connection point between the third detection line 0123 and the detection chip 011 is a pressure measuring point, and the detection chip 011 detects the response voltage of the detection voltage through the pressure measuring point.

[0085] In step 703, the detection chip determines the resistance value of the detection sensor according to the detection voltage and the response voltage.

[0086] Generally, if the flexible display screen is not rolled, the resistance value of the detection sensor is constant, and when the detection voltage is constant, the response voltage of the detection voltage is constant. If the flexible display screen is rolled, the resistance value of the detection sensor will change, and even if the detection voltage is constant, the response voltage of the detection voltage will change with the change of the resistance value of the detection sensor, so the resistance value of the detection sensor can be determined according to the detection voltage and the response voltage.

[0087] Optionally, the detection chip 011 determines the resistance value of the detection sensor according to the detection voltage, the response voltage and the resistance value of the target resistor 013. For example, the detection chip 011 uses the formula V1=R1×V according to the detection voltage, the response voltage of the detection voltage and the resistance value of the target resistor 013. ref / (R1+R2) determines the resistance value of the detection sensor. In this formula, V ref is the detection voltage (i.e., the detection voltage applied to the detection sensor by the detection chip 011 in step 701), V1 is the response voltage of the detection voltage (i.e., the response voltage received by the detection chip 011 in step 702), R2 is the resistance value of the target resistor 013, R1 is the resistance value of the detection sensor, V ref , V1 and R2 are all known numbers, and R1 is an unknown number.

[0088] In step 704, the detection chip determines the curling length of the flexible display screen according to the resistance value of the detection sensor and the first corresponding relationship, where the first corresponding relationship is the corresponding relationship between the sensing resistance value and the curling length.

[0089] Among them, the resistance value of the detection sensor is determined by step 703, and the first corresponding relationship is the corresponding relationship between the resistance value of the detection sensor and the curling length of the flexible display screen obtained by testing the flexible display screen before the flexible display screen leaves the factory. Before the flexible display screen leaves the factory, the flexible display screen can be curled along the first direction x, and in the process of curling the flexible display screen along the first direction x, the resistance value of the detection sensor (i.e., the sensed resistance value) and the curling length of the flexible display screen are observed to obtain the sensed resistance value corresponding to each curling length, and the first corresponding relationship is obtained based on multiple curling lengths and the sensed resistance value corresponding to each curling length, and the first corresponding relationship is recorded into the detection chip 011. Optionally, the first corresponding relationship is a one-to-one corresponding relationship between the sensed resistance value and the curling length (i.e., the first corresponding relationship is a corresponding table), or it can be a function with the sensed resistance value as an independent variable and the curling length as a dependent variable. The embodiment of the present application does not limit the expression form of the first corresponding relationship. When the first corresponding relationship is a one-to-one corresponding relationship between the sensing resistance value and the curling length, the detection chip 011 can query the first corresponding relationship according to the resistance value of the detection sensor detected in step 703 to obtain the curling length of the flexible display screen. When the first corresponding relationship is a function with the sensing resistance value as the independent variable and the curling length as the dependent variable, the detection chip 011 can output the resistance value of the detection sensor detected in step 703 to the function to calculate the curling length of the flexible display screen.

[0090] In summary, the curling length detection method of the flexible display provided by the embodiment of the present application detects the electrical connection of the redundant electrodes in the first touch channel in the touch layer of the flexible display, and the flexible display includes a curling detection structure, and the curling detection structure includes the redundant electrodes electrically connected in the first touch channel, and the curling detection structure can detect the curling length of the flexible display. Since the flexible display includes the curling detection structure for detecting the curling length of the flexible display, the curling length of the flexible display can be detected, which helps to prevent the flexible display from curling to the limit and damaging the flexible display.

[0091] Please refer to Figure 8 , which shows a flow chart of a method for manufacturing a flexible display screen provided in an embodiment of the present application. The method can be used to manufacture the flexible display screen provided in the above embodiment. Figure 8 , the method may include the following steps:

[0092] In step 801, a flexible display substrate is formed, where the flexible display substrate includes a flexible base substrate and a display structure layer and a packaging structure layer located on the flexible base substrate.

[0093] For example, Fig. 902 is a schematic diagram of the structure of a flexible display substrate 02 provided in an embodiment of the present application. The flexible display substrate 02 includes a flexible substrate 021, a display structure layer 022 and a packaging structure 023 located on the flexible substrate 021, and the packaging structure 023 is located on a side of the display structure layer 022 away from the flexible substrate 021. The packaging structure 023 is used to encapsulate the display structure layer 022 to prevent external water and oxygen from entering the display structure layer 022.

[0094] The flexible substrate 021 may be a flexible substrate made of a flexible material such as polyimide (PI). The display structure layer 022 includes a plurality of sub-pixels ( Fig. 9 021 ), each sub-pixel includes a switching unit and a light-emitting unit, and the switching unit is electrically connected to the light-emitting unit. The switching unit may be a top-gate thin film transistor (Thin Film Transistor, TFT) or a bottom-gate TFT. For example, the switching unit is a bottom-gate TFT, including a gate, a gate insulating layer, an active layer, an interlayer insulating layer, a source electrode, and a drain electrode arranged in sequence in a direction away from the flexible substrate substrate 021. The light-emitting unit includes an anode, a light-emitting layer, and a cathode arranged in sequence in a direction away from the flexible substrate substrate 021. The anode of the light-emitting unit is electrically connected to the drain of the switching unit. The encapsulation structure 023 may include inorganic layers and organic layers alternately stacked.

[0095] For example, a display structure layer 022 is first formed on a flexible substrate substrate 021, and then a packaging structure 023 is formed on a side of the display structure layer 022 away from the flexible substrate substrate 021. Forming the display structure layer 022 on the flexible substrate substrate 021 includes: sequentially forming a switch unit and a light-emitting unit on the flexible substrate substrate 021. For example, first, a gate, a gate insulating layer, an active layer, an interlayer insulating layer, and a source-drain electrode layer (including a source electrode and a drain electrode) are sequentially formed on the flexible substrate substrate 021 to obtain a switch unit, and then a flat layer, an anode, a pixel defining layer, a light-emitting layer, and a cathode are sequentially formed on a side of the source-drain electrode layer away from the flexible substrate substrate 021, and the anode, the light-emitting layer, and the cathode are superimposed to form a light-emitting unit, and the light-emitting unit is located in a sub-pixel area defined by the pixel defining layer. Forming a packaging structure 023 on a side of the display structure layer 022 away from the flexible substrate 021 includes: forming alternatingly stacked inorganic layers and organic layers on a side of the display structure layer 022 away from the flexible substrate 021, for example, forming a first inorganic layer, an organic layer, and a second inorganic layer in sequence on a side of the display structure layer 022 away from the flexible substrate 021 to obtain a packaging structure 023.

[0096] In step 802, a touch layer is formed on the flexible display substrate. The touch layer includes a touch structure, touch wiring, isolation wiring and detection wiring, and the isolation wiring is located between the touch wiring and the detection wiring.

[0097] Fig.10 Schematic diagram of a touch layer 03 formed on a flexible display substrate 02 according to an embodiment of the present application. The touch layer 03 includes a touch structure 031, a touch trace 08 (e.g., a transmitting trace 08R), a detection trace 012, and an isolation trace 07. The isolation trace 07 is located between the touch trace 08 and the detection trace 012. The touch structure 031 includes a touch electrode 0311 and a redundant electrode 0312 filled in the touch electrode 0311. The touch electrode 0311 does not contact the redundant electrode 0312. Figure 1 As shown, the touch layer 03 includes a transmitting channel 03T and a receiving channel 03R, the touch electrode 0311 located in the transmitting channel 03T is a transmitting electrode 0311T, and the touch electrode 0311 located in the receiving channel 03R is a receiving electrode 0311R. The touch layer 03 also includes a receiving electrode connecting line 10, which electrically connects adjacent receiving electrodes 0311R in the same receiving channel 03R.

[0098] Among them, the materials of the structures of the touch electrode 0311, the redundant electrode 0312, the receiving electrode connection line 10, the touch wiring 08, the detection wiring 012 and the isolation wiring 07 can be the same or different. For example, the materials of the touch electrode 0311, the redundant electrode 0312, the receiving electrode connection line 10, the touch wiring 08, the detection wiring 012 and the isolation wiring 07 are all ITO, or the materials of the touch electrode 0311, the redundant electrode 0312 and the receiving electrode connection line 10 are all ITO, and the materials of the touch wiring 08, the detection wiring 012 and the isolation wiring 07 are all metal. For example, an ITO material layer is formed on the flexible display substrate 02 by a plasma enhanced chemical vapor deposition (PECVD) process, and the ITO material layer is processed by a single patterning process to obtain the touch layer 03. Alternatively, first, an ITO material layer is formed on the flexible display substrate 02 by a PECVD process, and the ITO material layer is processed by a single patterning process to obtain the touch electrode 0311, the redundant electrode 0312, and the receiving electrode connecting line 10. Then, a metal material layer is formed on the flexible display substrate 02 by a PECVD process, and the metal material layer is processed by a single patterning process to obtain the touch wiring 08, the detection wiring 012, and the isolation wiring 07.

[0099] In step 803, a first insulating layer is formed on a side of the touch layer away from the flexible display substrate.

[0100] Fig.11 05 is a schematic diagram of a touch layer 03 provided in an embodiment of the present application after a first insulating layer 05 is formed on a side away from the flexible display substrate 02. Fig.11As shown, the first insulating layer 05 covers the side of the touch layer 03 away from the flexible display substrate 02, and the first insulating layer 05 is partially located in the gap between the touch electrode 0311 and the redundant electrode 0312, so that the touch electrode 0311 is insulated from the redundant electrode 0312. The first insulating layer 05 has a plurality of bridge holes M, and the orthographic projection of the bridge hole M on the plane where the flexible display substrate 02 is located is located within the orthographic projection of the redundant electrode 0312 in the first touch channel on the plane where the flexible display substrate 02 is located.

[0101] For example, a SiNx (Chinese: silicon nitride) material layer is formed on the side of the touch layer 03 away from the flexible display substrate 02 through a PECVD process, and the SiNx material layer is processed through a patterning process to form a bridge hole M on the SiNx material layer to obtain a first insulating layer 05.

[0102] In step 804, a bridge line is formed on a side of the first insulating layer away from the flexible display substrate, and the bridge line electrically connects adjacent redundant electrodes in the first touch channel through the bridge hole.

[0103] Fig.12 04 is a schematic diagram of a bridge line 04 formed on a side of a first insulating layer 05 away from a flexible display substrate 02 provided by an embodiment of the present application. The bridge line 04 electrically connects the redundant electrodes 0312 in the first touch channel through the bridge hole M. The redundant electrodes 0312 in the first touch channel and the bridge line 04 connecting these redundant electrodes 0312 constitute a detection sensor. Optionally, in the process of forming the bridge line, an emission electrode connection line ( Fig.12 The transmitting electrode connecting wires electrically connect the transmitting electrodes in the same transmitting channel.

[0104] For example, an ITO material layer is formed on a side of the first insulating layer 05 away from the flexible display substrate 02 by a PECVD process, and the ITO material layer is processed by a single patterning process to obtain the emitter electrode connection line and the bridge line 04 .

[0105] In step 805 , a protection layer is formed on a side of the bridge line away from the flexible display substrate.

[0106] The schematic diagram after forming the protective layer 06 on the side of the bridge line 04 away from the flexible display substrate 02 can be referred to Figure 2 The protective layer 06 covers all structures thereunder to protect them.

[0107] The material of the protective layer 06 may be SiOx (Chinese: silicon oxide). For example, a SiOx material layer is formed as the protective layer 06 on the side of the bridge line 04 away from the flexible display substrate 02 by a PECVD process.

[0108] The sequence of steps in the method for manufacturing a flexible display screen provided in the embodiment of the present application can be adjusted appropriately, and the steps can be increased or decreased accordingly according to the circumstances. Any technician familiar with the technical field can easily think of the changes within the technical scope disclosed in the present application, and the changes should be included in the protection scope of the present application, so they will not be repeated here.

[0109] In summary, in the manufacturing method of the flexible display provided by the embodiment of the present application, in the flexible display manufactured by the method, the redundant electrodes in the first touch channel in the touch layer are electrically connected, and the flexible display includes a curling detection structure, the curling detection structure includes the redundant electrodes electrically connected in the first touch channel, and the curling detection structure can detect the curling length of the flexible display. Since the flexible display includes the curling detection structure for detecting the curling length of the flexible display, the curling length of the flexible display can be detected, which helps to prevent the flexible display from curling to the limit and damaging the flexible display.

[0110] An embodiment of the present application further provides a display device, which includes the flexible display screen provided in the above embodiment. The display device can be any product with a display function, such as a tablet computer, electronic paper, a smart phone, a laptop computer or a monitor.

[0111] The one-time patterning process involved in the embodiment of the present application includes photoresist coating, exposure, development, etching and photoresist stripping. The material layer (e.g., ITO material layer) is processed by the one-time patterning process, including: coating a layer of photoresist on the material layer (e.g., ITO material layer) to form a photoresist layer, exposing the photoresist layer using a mask plate so that the photoresist layer forms a completely exposed area and a non-exposed area, and then using a development process to completely remove the photoresist in the completely exposed area, and retain all the photoresist in the non-exposed area, and etching the area corresponding to the completely exposed area on the material layer (e.g., ITO material layer) using an etching process, and finally stripping the photoresist in the non-exposed area to obtain a corresponding structure (e.g., touch electrode 0311). Here, the photoresist is a positive photoresist as an example for explanation. When the photoresist is a negative photoresist, the process of the one-time patterning process can refer to the description in this paragraph, and the embodiment of the present application will not be repeated here.

[0112] In this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "electrically connected" means that the connection can transfer charge, but does not limit the need for charge transfer. For example, A and B are electrically connected, which means that A and B are connected and charge can be transferred between A and B, but does not limit the need for charge transfer between A and B.

[0113] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element.

[0114] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A flexible display screen, characterized in that: The flexible display screen can be rolled up along a first direction, and the flexible display screen comprises: a rolling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate; The touch layer includes a plurality of touch channels, the touch channels include a plurality of touch structures, the touch structures include touch electrodes and redundant electrodes filled in the touch electrodes, the touch electrodes are insulated from the redundant electrodes, the redundant electrodes in a first touch channel among the plurality of touch channels are electrically connected, and an extension direction of the first touch channel is parallel to the first direction; The curling detection structure includes: a detection chip, a detection wiring, and a detection sensor composed of redundant electrodes electrically connected in the first touch channel; the detection wiring is electrically connected to the detection sensor and the detection chip respectively; when the flexible display screen is curled along the first direction, the resistance value of the detection sensor changes with the curling of the flexible display screen; the detection chip is used to detect the resistance value of the detection sensor, and determine the curling length of the flexible display screen according to the resistance value of the detection sensor.

2. The flexible display screen according to claim 1, characterized in that: The detection line includes a first detection line, a second detection line and a third detection line, one end of the first detection line is electrically connected to the detection sensor, the other end of the first detection line is electrically connected to one end of the second detection line and one end of the third detection line respectively, and the other end of the second detection line and the other end of the third detection line are electrically connected to the detection chip respectively; The detection chip is used to apply a detection voltage to the detection sensor through the second detection line, receive a response voltage to the detection voltage through the third detection line, and determine a resistance value of the detection sensor according to the detection voltage and the response voltage.

3. The flexible display screen according to claim 2, characterized in that: The curl detection structure further includes: a target resistor; The target resistor is connected in series to the second detection line; The detection chip is used to determine the resistance value of the detection sensor according to the detection voltage, the response voltage and the resistance value of the target resistor.

4. The flexible display screen according to any one of claims 1 to 3, characterized in that: The step of determining the curling length of the flexible display screen according to the resistance value of the detection sensor comprises: The curling length of the flexible display screen is determined according to the resistance value of the detection sensor and a first corresponding relationship, wherein the first corresponding relationship is a corresponding relationship between the sensing resistance value and the curling length.

5. The flexible display screen according to any one of claims 1 to 3, characterized in that: The flexible display screen further includes: a touch control chip, and an isolation wiring and a plurality of touch control wirings located on the flexible display substrate; The touch electrodes in each of the touch channels are electrically connected, and each of the plurality of touch wires is used to electrically connect the touch electrodes in one of the touch channels to the touch chip; The isolation line is located between the detection line and the touch line, and the isolation line is used to perform signal isolation between the detection line and the touch line.

6. The flexible display screen according to claim 5, characterized in that: The isolation wiring and the detection wiring are located on the same layer; The detection trace and the detection sensor are located on the same layer, or the detection sensor is located on a side of the detection trace away from the flexible display substrate.

7. A method for detecting the curling length of a flexible display screen, characterized in that: The flexible display screen can be rolled along a first direction, the flexible display screen comprises a rolling detection structure, a flexible display substrate, and a touch layer located on the flexible display substrate; the touch layer comprises a plurality of touch channels, the touch channels comprise a plurality of touch structures, the touch structures comprise touch electrodes and redundant electrodes filled in the touch electrodes, the touch electrodes are insulated from the redundant electrodes, the redundant electrodes in a first touch channel among the plurality of touch channels are electrically connected, and the extension direction of the first touch channel is parallel to the first direction, the rolling detection structure comprises: a detection chip, a detection wiring, and a detection sensor composed of the redundant electrodes electrically connected in the first touch channel; the detection wiring is electrically connected to the detection sensor and the detection chip respectively; in the process of the flexible display screen rolling along the first direction, the resistance value of the detection sensor changes with the rolling of the flexible display screen; The method comprises: the detection chip detecting the resistance value of the detection sensor; The detection chip determines the curling length of the flexible display screen according to the resistance value of the detection sensor.

8. The method according to claim 7, characterized in that The detection line includes a first detection line, a second detection line and a third detection line, one end of the first detection line is electrically connected to the detection sensor, the other end of the first detection line is electrically connected to one end of the second detection line and one end of the third detection line respectively, and the other end of the second detection line and the other end of the third detection line are electrically connected to the detection chip respectively; The detection chip detects the resistance value of the detection sensor, including: The detection chip applies a detection voltage to the detection sensor through the second detection wiring; The detection chip receives a response voltage of the detection voltage through the third detection line; The detection chip determines the resistance value of the detection sensor according to the detection voltage and the response voltage.

9. The method according to claim 8, characterized in that The curling detection structure further includes a target resistor, the target resistor is connected in series to the second detection line, and the detection chip determines the resistance value of the detection sensor according to the detection voltage and the response voltage, including: The detection chip determines the resistance value of the detection sensor according to the detection voltage, the response voltage and the resistance value of the target resistor.

10. The method according to any one of claims 7 to 9, characterized in that: The step of determining the curling length of the flexible display screen according to the resistance value of the detection sensor comprises: The curling length of the flexible display screen is determined according to the resistance value of the detection sensor and a first corresponding relationship, wherein the first corresponding relationship is a corresponding relationship between the sensing resistance value and the curling length.

11. A display device, characterized in that: Comprising the flexible display screen as described in any one of claims 1 to 6.

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