Flexible display panel, display device and control method thereof

Abstract

The application discloses a flexible display panel, a display device and a control method thereof. The flexible display panel comprises at least one folding display area and a plurality of non-folding display areas. The flexible display panel comprises a substrate, a light emitting device layer, a deformation detection layer and a driving circuit layer. The light emitting device layer is located on one side of the substrate and comprises a plurality of light emitting units. The deformation detection layer is located on the side of the light emitting device layer away from the substrate and comprises a plurality of detection capacitors located in the folding display area. The driving circuit layer is located on the side of the light emitting device layer close to the substrate and is electrically connected with the light emitting units. The driving circuit layer is used for adjusting the light emitting brightness of the light emitting units located in the folding display area according to the change of the capacitance. According to the embodiments provided in the application, the flexible display panel, the display device and the control method thereof provided in the application reduce the perception degree of the user to the uneven folding display area.

Description

Technical Field

[0001] This application relates to the field of flexible display panels, specifically to a flexible display panel, a display device, and a control method thereof. Background Technology

[0002] With the development of display technology, users have put forward various different usage requirements for display panels. Foldable flexible display panels are foldable panels made of soft materials, which have advantages such as small size and portability, and are being used more and more widely in various fields.

[0003] Typically, the flexible materials used in foldable flexible display panels have a certain bending strength. However, when the bending strength exceeds the bending strength of the flexible material, or when there is film slippage between multiple layers of flexible materials during bending, the flexible display panel may undergo irreversible deformation, such as creases. When the flexible display panel is in a flat state, creases will cause optical differences between the folded display area and the non-folded display area, affecting the appearance and display effect of the flexible display panel. Summary of the Invention

[0004] This application provides a flexible display panel, a display device, and a control method thereof, with the aim of improving the optical difference between the folded display area and the non-folded display area caused by creases generated during folding.

[0005] An embodiment of the first aspect of this application provides a flexible display panel, which includes at least one foldable display area and a plurality of non-foldable display areas, wherein the at least one foldable display area divides the flexible display panel into a plurality of non-foldable display areas; the flexible display panel includes:

[0006] Substrate;

[0007] The light-emitting device layer is located on one side of the substrate and includes multiple light-emitting units;

[0008] The deformation detection layer is located on the side of the light-emitting device layer away from the substrate. The deformation detection layer includes multiple detection capacitors located in the folded display area. The capacitance of the detection capacitors changes with the degree of bending of the folded display area.

[0009] The driving circuit layer is located on the side of the light-emitting device layer closest to the substrate. The driving circuit layer is electrically connected to the light-emitting unit and is used to adjust the luminous brightness of the light-emitting unit according to the change in capacitance.

[0010] According to any of the foregoing embodiments of the first aspect of this application, the deformation detection layer includes an electrode layer, the electrode layer includes a plurality of first detection electrode groups and a plurality of second detection electrode groups, the plurality of first detection electrode groups are arranged along a first direction, the plurality of second detection electrode groups are arranged along a second direction, the first detection electrode group includes a plurality of first detection electrodes arranged along the second direction, the second detection electrode group includes a plurality of second detection electrodes arranged along the first direction, a detection capacitor is formed between adjacent first detection electrodes and second detection electrodes, and the first direction and the second direction are intersected.

[0011] According to any of the foregoing embodiments of the first aspect of this application, a gap is formed between two adjacent first detection electrodes arranged along the second direction. The deformation detection layer further includes a bridging layer and an insulating layer. The insulating layer covers the bridging layer. The electrode layer is disposed on the side of the insulating layer away from the bridging layer. The bridging layer includes a bridging structure. The projection of the bridging structure on the electrode layer at least partially overlaps with the gap. The bridging structure is connected to the vias of two adjacent first detection electrodes arranged along the second direction.

[0012] According to any of the foregoing embodiments of the first aspect of this application, the deformation detection layer further includes a buffer layer located on the side of the light-emitting device layer away from the substrate, and a bridging layer is disposed on the side of the buffer layer away from the substrate.

[0013] According to any of the foregoing embodiments of the first aspect of this application, the deformation detection layer further includes a passivation layer located on the side of the electrode layer opposite to the substrate.

[0014] According to any of the foregoing embodiments of the first aspect of this application, the folded display area is divided into multiple sub-display areas, at least one detection electrode and at least one light-emitting unit are located in the sub-display areas, and the driving circuit layer is used to adjust the light emission brightness of the light-emitting units located in the same sub-display area according to the change in capacitance of the detection capacitor in the sub-display area.

[0015] According to any of the foregoing embodiments of the first aspect of this application, the driving circuit layer is used to adjust the operating current and / or light emission duration of the light-emitting unit located in the folding display area according to the change in capacitance in order to adjust the brightness of the light-emitting device.

[0016] According to any of the foregoing embodiments of the first aspect of this application, the flexible display panel further includes a touch layer, which includes a plurality of first touch electrodes and a plurality of second touch electrodes. The first touch electrodes located in the folded display area are multiplexed as first detection electrodes, and the second touch electrodes located in the folded display area are multiplexed as second detection electrodes.

[0017] An embodiment of the second aspect of this application also provides a display device, including:

[0018] Control unit;

[0019] Such as any of the flexible display panels in the first aspect.

[0020] An embodiment of the third aspect of this application also provides a method for controlling a display device, including:

[0021] Obtain the capacitance change value of the detection capacitor;

[0022] Based on the change in capacitance, information on crease changes is generated;

[0023] When the flexible display panel is in a flat state, the brightness of the light-emitting unit is adjusted by controlling the driving circuit layer based on the crease change information.

[0024] In the flexible display panel, display device, and control method provided in this application embodiment, multiple detection capacitors are provided in the deformation detection layer. The electrodes of each detection capacitor deform to different degrees as the flexible display panel bends, and the spacing between the electrodes deforms to different degrees, causing changes in the capacitance of the detection capacitors. By analyzing the capacitance changes of the detection capacitors distributed in the folded display area, the bending condition of the folded display area when the flexible display panel is in a flat state, i.e., the irreversible crease changes, can be obtained. Therefore, based on the bending condition of the folded display area, the luminous intensity of the light-emitting unit can be controlled through the driving circuit layer, reducing the user's perception of the uneven folded display area and thus minimizing the impact of the uneven folded display area on the user's visual experience. Attached Figure Description

[0025] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0026] Figure 1 This is a schematic diagram of the structure of a flexible display panel provided in the first aspect embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the folded state of a flexible display panel provided in the first aspect embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the structure of a flexible display panel in a flat state according to the first aspect embodiment of this application;

[0029] Figure 4 This is a cross-sectional structural schematic diagram of a flexible display panel provided in the first aspect embodiment of this application;

[0030] Figure 5 This is a cross-sectional structural diagram of a flexible display panel provided in the first aspect of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Flexible display panel; BB. Foldable display area; AA. Non-foldable display area; CC. Sub-display area; 200. Crease;

[0033] 1. Substrate; 2. Light-emitting device layer; 21. Light-emitting unit; 22. Pixel aperture; 23. Pixel definition layer; 24. Encapsulation layer;

[0034] 3. Deformation detection layer; 32. First detection electrode group; 321. First detection electrode; 322. Spacing part; 33. Second detection electrode group; 331. Second detection electrode; 341. Bridging structure; 35. Insulating layer; 36. Buffer layer;

[0035] 4. Driving circuit layer; 41. Sub-pixel control unit; 5. Cover plate; 6. Touch layer; 61. First touch electrode; 62. Second touch electrode.

[0036] Specific implementation methods

[0037] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0039] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0040] With the development of display technology, users have put forward various different usage requirements for display panels. Foldable flexible display panels are foldable panels made of soft materials, which have advantages such as small size and portability, and are being used more and more widely in various fields.

[0041] Typically, the multi-layer flexible materials used in foldable flexible display panels have a certain bending strength. However, when the bending strength exceeds the bending strength of the flexible materials, or when there is film slippage between the multi-layer flexible materials during bending, the flexible display panel may undergo irreversible deformation, such as creases. When the flexible display panel is in a flat state, creases will cause optical differences between the folded display area and the non-folded display area, affecting the appearance and display effect of the flexible display panel.

[0042] Existing solutions cannot adequately address the technical problems. To resolve these issues, this application provides a flexible display panel, a display device, and a control method thereof. The following description, in conjunction with the accompanying drawings, will illustrate various embodiments of the flexible display panel, the display device, and the control method thereof.

[0043] Please see Figure 1 , Figure 2 and Figure 3 The flexible display panel 100 includes at least one foldable display area BB and a plurality of non-foldable display areas AA, wherein the at least one foldable display area BB divides the flexible display panel 100 into a plurality of non-foldable display areas AA.

[0044] The flexible display panel 100 can be used to display images. The flexible display panel 100 has a folded state and a flat state. When the flexible display panel 100 is folded, the folded display area BB is at least partially bent into an arc shape. Multiple non-folded display areas AA connected to the folded display area BB can be stacked, thereby reducing the volume of the flexible display screen. Figure 2 The illustrated embodiment is a schematic diagram of the flexible display panel 100 in a folded state. When the folded display area BB unfolds, both the folded display area BB and the non-folded display area AA connected to it can be displayed flat, thereby achieving a larger display area. Figure 3The illustrated embodiment is a structural schematic diagram of the flexible display panel 100 in a flat state. Optionally, the number of foldable display areas BB can be one, and the number of non-foldable display areas AA can be two.

[0045] Please refer to the following: Figure 4 The flexible display panel 100 includes: a substrate 1, a light-emitting device layer 2, a deformation detection layer 3, and a driving circuit layer 4. The light-emitting device layer 2 is located on one side of the substrate 1 and includes a plurality of light-emitting units 21. The deformation detection layer 3 is located on the side of the light-emitting device layer 2 away from the substrate 1 and includes a plurality of detection capacitors 31 located in the folded display area BB. The capacitance of the detection capacitors 31 changes with the degree of bending of the folded display area BB. The driving circuit layer 4 is located on the side of the light-emitting device layer 2 close to the substrate 1 and is electrically connected to the light-emitting units 21. The driving circuit layer 4 is used to adjust the light emission brightness of the light-emitting units 21 according to the change in capacitance.

[0046] Substrate 1 is a flexible substrate, such as polyimide. The light-emitting device layer 2 includes a pixel definition layer 23 and multiple light-emitting units 21. The pixel definition layer 23 includes multiple pixel openings 22, and the light-emitting units 21 are disposed in the pixel openings 22. The multiple light-emitting units 21 can each emit light of different colors. For example, they can be red light-emitting units that emit red light, green light-emitting units that emit green light, and blue light-emitting units that emit blue light. Exemplarily, in this embodiment, an organic light-emitting diode (OLED) can be selected to fabricate the aforementioned light-emitting units 21. Alternatively, the light-emitting units 21 can be configured as micro light-emitting diodes (Micro-LEDs) or quantum light-emitting diodes (QLEDs). The driving circuit layer 4 may include multiple sub-pixel control units 41 for controlling whether the light-emitting units 21 emit light and the duration of light emission. The driving circuit layer 4 may include a gate metal layer, a source-drain metal layer, an active layer, etc. The flexible display panel 100 in this embodiment may also include a cover plate 5, an optical adhesive, and a thin film encapsulation layer, etc., which will not be described in detail here.

[0047] The deformation detection layer 3 contains multiple detection capacitors 31, the capacitance of which is related to the area of ​​the two electrodes facing each other. When the flexible display panel 100 is in a flat state, and the surface of the deformation detection layer 3 near the light-emitting device layer 2 is a flat surface, each detection capacitor 31 maintains a certain capacitance. However, when the flexible display panel 100 undergoes multiple bends, resulting in an irreversible bending deformation in the folded display area BB while the flexible display panel 100 is in a flat state, the surface of the deformation detection layer 3 near the light-emitting device layer 2 also deforms. This deformation, for example... Figure 2 The crease 200 is shown. In the flat state, the deformation detection layer 3 is no longer a flat surface. The electrodes of each detection capacitor 31 deform to different degrees, and the spacing between the electrodes deforms to different degrees, causing the capacitance of the detection capacitor 31 to change. By analyzing the capacitance changes of the detection capacitors 31 distributed in the folded display area BB, the irreversible crease bending of the folded display area BB in the flat state of the flexible display panel 100 can be determined. Therefore, based on the crease bending of the folded display area BB, the luminous intensity of the light-emitting unit 21 can be controlled by the driving circuit layer 4 to reduce the user's perception of the uneven folded display area BB, thereby reducing the impact of the uneven folded display area BB on the user's visual experience.

[0048] The two electrodes forming the detection capacitor 31 can be spaced apart along the thickness direction of the flexible display panel 100, or they can be spaced apart along a direction perpendicular to the thickness direction of the flexible display panel 100. Please refer to [reference needed]. Figure 5 The deformation detection layer 3 includes an electrode layer, which includes a plurality of first detection electrode groups 32 and a plurality of second detection electrode groups 33. The plurality of first detection electrode groups 32 are arranged along a first direction X, and the plurality of second detection electrode groups 33 are arranged along a second direction Y. The first detection electrode group 32 includes a plurality of first detection electrodes 321 arranged along the second direction Y, and the second detection electrode group 33 includes a plurality of second detection electrodes 331 arranged along the first direction X. A detection capacitor 31 is formed between adjacent first detection electrodes 321 and second detection electrodes 331. The first direction X and the second direction Y are intersected.

[0049] It should be noted that the first detection electrode 321 described above can be a detection driving electrode Tx, and the second detection electrode 331 can be a detection sensing electrode Rx; or, the first detection electrode 321 can be a detection sensing electrode Rx, and the second detection electrode 331 can be a detection driving electrode Tx. Furthermore, the number of the first detection electrode 321 and the second detection electrode 331 shown in the figure is merely illustrative; the actual electrode structure used can be configured with the required size and precision to determine the number of the first detection electrode 321 and the second detection electrode 331.

[0050] Multiple first detection electrodes 321 arranged along the second direction Y can be electrically connected in sequence, and multiple second detection electrodes 331 arranged along the first direction X can be electrically connected in sequence. Multiple first detection electrode groups 32 and multiple second detection electrode groups 331 can be electrically connected to an external control chip through signal lines, thereby sending the electrical signals of the changes in each detection capacitor 31 to the control chip so that the control chip can analyze and obtain the crease change information of the bending display area, that is, the bending curve of the crease.

[0051] Optionally, the folded display area BB can be bent along a bending axis parallel to the first direction X and / or the second direction Y, which can, to some extent, prevent the electrode layer from breaking due to the bending of the flexible display panel 100, thus avoiding power loss between adjacent first detection electrodes 321 or adjacent second detection electrodes 331.

[0052] In one embodiment, a gap 322 is formed between two adjacent first detection electrodes 321 arranged along the second direction Y. The deformation detection layer 3 further includes a bridging layer and an insulating layer 35. The insulating layer 35 covers the bridging layer. The electrode layer is disposed on the side of the insulating layer 35 away from the bridging layer. The bridging layer includes a bridging structure 341. The projection of the bridging structure 341 on the electrode layer at least partially overlaps with the gap 322. The bridging structure 341 is connected to the vias of two adjacent first detection electrodes 321 arranged along the second direction Y.

[0053] By setting a bridging layer, the first detection electrode 321 and the second detection electrode 331 can be disposed in the same layer, that is, formed using the same material layer and the same patterning process. The bridging structure 341 can electrically connect the first detection electrodes 321 arranged along the second direction Y.

[0054] In some embodiments, the deformation detection layer 3 further includes a buffer layer 36 located on the side of the light-emitting device layer 2 away from the substrate 1, and a bridging layer is disposed on the side of the buffer layer 36 away from the substrate 1.

[0055] The light-emitting device layer 2 may further include an encapsulation layer 24 covering the pixel definition layer 23, and a buffer layer 36 may be disposed on the encapsulation layer 24. The buffer layer 36 may be a SiNx layer, a SiOx layer, or a combination thereof, and the bridging structure 341 disposed on the buffer layer 36 may be a metal such as Cu, Al, Mo, Cr, Nd, Ni, Mn, Ti, or W. Of course, in order to prevent the deformation detection layer 3 from blocking the light emitted by the light-emitting unit 21, the deformation detection layer 3 is a light-transmitting material.

[0056] The deformation detection layer 3 also includes a passivation layer 37 located on the side of the electrode layer away from the substrate 1. The passivation layer 37 can achieve insulation between the electrode layer and other layer structures in the flexible display panel 100.

[0057] The folded display area BB is divided into multiple sub-display areas CC. At least one detection capacitor 31 and at least one light-emitting unit 21 are located in the sub-display area CC. The driving circuit layer 4 is used to adjust the light emission brightness of the light-emitting unit 21 located in the same sub-display area CC according to the change in capacitance of the detection capacitor 31 in the sub-display area.

[0058] Those skilled in the art can pre-divide the folded display area BB into multiple sub-display areas CC as needed. The detection capacitors 31 and light-emitting units 21 distributed in each sub-display area CC have a mapping relationship. The mapped light rays are pre-stored in the control chip, so that the control chip can adjust the light-emitting brightness of the light-emitting unit 21 located in the sub-display area CC according to the change in capacitance of the detection capacitors 31 in each sub-display area CC, so that the driving circuit layer 4 can more precisely adjust the light-emitting brightness of the light-emitting unit 21.

[0059] The driving circuit layer 4 is used to adjust the operating current and / or light emission duration of the light-emitting unit 21 located in the folded display area BB according to the change in capacitance in order to adjust the brightness of the light-emitting device.

[0060] According to Bloch's law: I*T=C, where I is the operating current, T is the light emission duration, and C is the brightness, it can be seen that the brightness depends on the product of the operating current and the light emission duration. That is, within a certain light emission duration and under a certain operating current, a certain brightness of light effect will be produced. Therefore, in specific implementation, different operating currents or different energizing durations can be provided to the light-emitting unit 21 through the driving circuit layer 4 to adjust the brightness of the light-emitting unit 21.

[0061] Since the folding display area BB is usually folded along a fixed bending axis, the deformation of multiple regions in the folding display area BB along the bending axis extension direction is roughly the same, that is, the capacitance change of multiple detection capacitors 31 along the bending axis extension direction is roughly the same, while the capacitance change of multiple detection capacitors 31 along the direction perpendicular to the folding bending axis extension direction is much different. Therefore, in order to reduce the amount of computation, the driving circuit layer 4 can adjust the light emission brightness of the light emission unit 21 located in the folding display area BB according to the capacitance change of multiple detection capacitors 31 along the direction perpendicular to the folding bending axis extension direction.

[0062] For example, the bending axis of the folding display area BB is set along the second direction Y. After the flexible display panel 100 is bent multiple times, a crease extending along the second direction Y is formed in the folding display area BB. The folding display area BB includes a first side and a second side extending along the second direction Y. The capacitance changes of the detection capacitors 31 located on the first side are approximately the same, and the capacitance changes of the detection capacitors 31 located on the second side are also approximately the same. However, the capacitances of the multiple detection capacitors 31 along the direction from the first side to the second side differ significantly. The driving circuit layer 4 can adjust the light emission brightness of the light-emitting unit 21 located in the folding display area BB according to the capacitance changes of the multiple detection capacitors 31 along the direction from the first side to the second side.

[0063] In some embodiments, the flexible display panel 100 further includes a touch layer 6, which includes a plurality of first touch electrodes 61 and a plurality of second touch electrodes 62. The first touch electrodes 61 located in the folded display area BB are multiplexed as first detection electrodes 321, and the second touch electrodes 62 located in the folded display area BB are multiplexed as second detection electrodes 331.

[0064] The touch layer 6 is distributed in the folded display area BB and the non-folded display area AA, enabling touch operation on the entire flexible display panel 100. The first touch electrode 61 located in the folded display area BB is reused as the first detection electrode 321, and the second touch electrode 62 located in the folded display area BB is reused as the second detection electrode. That is, in addition to realizing the touch function, the first touch electrode 61 and the second touch electrode 62 are also used to collect bending change information of the folded display area BB, thereby simplifying the structure of the flexible display panel 100.

[0065] Secondly, this application also provides a display device. The display device provided in this application has the relevant structure of the aforementioned flexible display panel 100. Refer to the flexible display panel 100 provided in the above embodiments. It has all the beneficial effects of the aforementioned flexible display panel 100, which will not be repeated here.

[0066] Thirdly, embodiments of this application also provide a control method for a display device, wherein the control direction is used to control the display device as described above, and the control method includes:

[0067] S10, obtain the capacitance change value of the detection capacitor;

[0068] S20 generates crease change information based on the capacitance change value;

[0069] S30, when the flexible display panel is in a flat state, controls the drive circuit layer to adjust the brightness of the light-emitting unit based on the crease change information.

[0070] The crease change information includes the crease depth and curvature of the crease in the bent display area. By controlling the light intensity of the light-emitting unit through the driving circuit layer, the user's perception of the uneven folded display area is reduced, thereby minimizing the impact of the uneven folded display area on the user's visual experience.

[0071] When the first touch electrode located in the folded display area is reused as the first detection electrode, and the second touch electrode located in the folded display area is reused as the second detection electrode, the capacitance of the detection capacitor will change over a period of time when the user touches the first touch electrode and the second touch electrode. In order to avoid abnormal adjustment of the light emission unit's brightness caused by the capacitance change due to the user's touch, and since the capacitance change caused by the user's touch has the characteristic of large change per unit time, capacitance change values ​​greater than a preset threshold within a preset time period can be excluded, and only capacitance change values ​​less than the preset threshold within a preset time period can be used to generate crease change information.

[0072] In some embodiments, user gaze information, ambient light information, etc., can also be acquired, and the brightness of the light-emitting unit can be adjusted by controlling the driving circuit layer based on multiple parameters such as crease change information, user gaze information, and ambient light information, so as to reduce the user's perception of the uneven folded display area.

[0073] The embodiments described above are not exhaustive and do not limit the invention to specific examples. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A flexible display panel, characterized in that, The flexible display panel includes at least one foldable display area and multiple non-foldable display areas, wherein the at least one foldable display area divides the flexible display panel into multiple non-foldable display areas; The flexible display panel includes: Substrate; A light-emitting device layer is located on one side of the substrate, and the light-emitting device layer includes a plurality of light-emitting units; A deformation detection layer is located on the side of the light-emitting device layer facing away from the substrate. The deformation detection layer includes a plurality of detection capacitors located in the folded display area. The capacitance of the detection capacitors changes with the degree of bending of the folded display area. A driving circuit layer is located on the side of the light-emitting device layer close to the substrate. The driving circuit layer is electrically connected to the light-emitting unit and is used to adjust the light-emitting brightness of the light-emitting unit according to the change in capacitance. The deformation detection layer includes an electrode layer, which includes a plurality of first detection electrode groups and a plurality of second detection electrode groups. The plurality of first detection electrode groups are arranged along a first direction, and the plurality of second detection electrode groups are arranged along a second direction. The first detection electrode group includes a plurality of first detection electrodes arranged along the second direction, and the second detection electrode group includes a plurality of second detection electrodes arranged along the first direction. A detection capacitor is formed between adjacent first detection electrodes and second detection electrodes. The first direction and the second direction are intersected.

2. The flexible display panel according to claim 1, characterized in that, A gap is formed between two adjacent first detection electrodes arranged along the second direction. The deformation detection layer further includes a bridging layer and an insulating layer. The insulating layer covers the bridging layer. The electrode layer is disposed on the side of the insulating layer away from the bridging layer. The bridging layer includes a bridging structure. The projection of the bridging structure on the electrode layer at least partially overlaps with the gap. The bridging structure is connected to the vias of two adjacent first detection electrodes arranged along the second direction.

3. The flexible display panel according to claim 2, characterized in that, The deformation detection layer further includes a buffer layer located on the side of the light-emitting device layer away from the substrate, and the bridging layer is disposed on the side of the buffer layer away from the substrate.

4. The flexible display panel according to claim 1, characterized in that, The deformation detection layer also includes a passivation layer located on the side of the electrode layer opposite to the substrate.

5. The flexible display panel according to claim 1, characterized in that, The folded display area is divided into multiple sub-display areas, at least one of the detection capacitors and at least one of the light-emitting units are located in the sub-display areas, and the driving circuit layer is used to adjust the light-emitting brightness of the light-emitting units located in the same sub-display area according to the change in capacitance of the detection capacitor in the sub-display area.

6. The flexible display panel according to any one of claims 1 to 5, characterized in that, The driving circuit layer is used to adjust the operating current and / or light emission duration of the light-emitting unit located in the folded display area according to the change in capacitance in order to adjust the brightness of the light-emitting device.

7. The flexible display panel according to claim 1, characterized in that, The flexible display panel further includes a touch layer, which includes a plurality of first touch electrodes and a plurality of second touch electrodes. The first touch electrodes located in the folded display area are multiplexed as the first detection electrodes, and the second touch electrodes located in the folded display area are multiplexed as the second detection electrodes.

8. A display device, characterized in that, include: Control unit; The flexible display panel as described in any one of claims 1-7.

9. A control method for a display device, applied to the display device as described in claim 8, characterized in that, include: Obtain the capacitance change value of the detection capacitor; Based on the capacitance change value, crease change information is generated; When the flexible display panel is in a flat state, the brightness of the light-emitting unit is adjusted by controlling the driving circuit layer according to the crease change information.

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