Foldable display panel and display device

Abstract

The embodiment of the invention discloses a foldable display panel and a display device, the foldable display panel comprises two first display areas and a second display area, the two first display areas rotate by taking the second display area as an axis, and corresponding to the second display area, the foldable display panel comprises a flexible substrate, a driving layer and a display layer which are stacked in sequence, the driving layer comprises at least two data driving circuits and a plurality of data lines, the two data driving circuits are arranged on the two opposite sides of the surface of the flexible substrate at a preset interval in the first direction, and at least one groove is formed in the position, between the two data driving circuits, of the flexible substrate; the data line is arranged along the inner wall of the groove and connected with the two data driving circuits, and when the second display area is bent or stretched, the data line deforms along with the groove, so that the tearing effect on the data line is reduced, and the service life of the data line is prolonged.

Description

Technical Field

[0001] The present application relates to the field of display technology, mainly to foldable display panels and display devices. Background Art

[0002] Flexible display panels are widely used in foldable electronic devices, which usually have folding reliability issues. During the bending process of foldable electronic devices, the stress on each film layer will produce different degrees of stress and deformation, and the stress and deformation will increase with the decrease of the bending radius. If the data line cracks or even breaks during the bending process, it will cause the folding function to fail, resulting in serious display defects such as black spots and black screens.

[0003] Therefore, how to arrange the data lines in the bending area of ​​the flexible display panel to avoid problems such as black spots and black screen caused by data line breakage is an issue that needs to be solved urgently. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present application proposes a foldable display panel and a display device, which are used to improve the tear resistance of the data line in the bending area and increase the service life of the data line, thereby reducing the probability of black spots or a black screen appearing on the display panel.

[0005] An embodiment of the present application provides a foldable display panel, comprising two first display areas and one second display area, wherein the second display area is arranged between the two first display areas along a first direction, the two first display areas rotate around the second display area as an axis, and the first display area and the second display area include a plurality of pixel units arranged in an array; corresponding to the second display area, the foldable display panel comprises a flexible substrate, a driving layer and a display layer stacked in sequence, the driving layer comprises at least two data driving circuits and a plurality of data lines, the two data driving circuits are arranged at opposite sides of a surface of the flexible substrate at a preset distance along the first direction, the flexible substrate is provided with at least one groove at a position between the two driving circuits, the data line is arranged along the inner wall of the groove and connects the two data driving circuits, and the data line is used to transmit a data signal provided by the data driving circuit to a pixel unit arranged in the display layer to drive the pixel unit to perform image display.

[0006] Optionally, the pixel unit is connected to a first data line and a second data line, and the pixel unit includes a selection module, which is electrically connected to the first data line, the second data line and a data signal input terminal, and the selection module is used to control the first data line or the second data line to transmit a data signal to the data signal input terminal. When the first data line is abnormal, the selection module controls the second data line to continue transmitting the data signal to the data signal input terminal.

[0007] Optionally, the pixel unit also includes a driving module, a first control module, a second control module and a first node, the first control module is electrically connected to the data signal input terminal and the driving module, the driving module is electrically connected to the second control module and the first node, and the first control module is used to receive a data signal from the data signal input terminal and transmit it to the first node through the driving module and the second control module, so as to charge the first node to a preset potential.

[0008] Optionally, the pixel unit also includes a first light-emitting control module, a second light-emitting control module and a light-emitting module, the first light-emitting control module is electrically connected to the driving voltage terminal, the light-emitting control terminal and the driving module; the second light-emitting control module is electrically connected to the driving module, the light-emitting module and the light-emitting control terminal; the first light-emitting control module is used to receive the driving voltage from the driving voltage terminal under the control of the control terminal and transmit it to the driving module, the driving module controls the driving voltage to be transmitted to the second light-emitting control module according to the data signal, and the second light-emitting control module is used to transmit the driving voltage to the light-emitting module under the control of the light-emitting control terminal to drive the light-emitting module to emit light.

[0009] Optionally, the driving layer also includes a plurality of scanning lines arranged in sequence along the first direction and extending along the second direction, the first direction being perpendicular to the second direction; the selection module includes a first switch tube and a first capacitor, the control end of the first switch tube is electrically connected to the ixth scanning line and the first data line, the first conductive end of the first switch tube is electrically connected to the second data line, the second conductive end of the first switch tube is electrically connected to the data signal input end, and the first capacitor is electrically connected between the control end and the ground end of the first switch tube, wherein i>x≥1, and i, x are integers; the first switch tube is used to be turned on under the control of the scanning signal output by the ixth scanning line, and to be turned on when the first data line stops transmitting the data signal, so as to control the second data line to be electrically connected to the data signal input end, and when the first data line transmits the data signal, the first switch tube is turned off, so as to control the second data line to be electrically disconnected from the data signal input end.

[0010] Optionally, the driving module includes a second switch tube and a second capacitor, the first control module includes a third switch tube, and the second control module includes a fourth switch tube, the control end of the second switch tube is electrically connected to the first node, the first conductive end of the second switch tube is electrically connected to the third switch tube, and the second conductive end of the second switch tube is electrically connected to the fourth switch tube; the control end of the third switch tube is electrically connected to the i-th scan line, the first conductive end of the third switch tube is electrically connected to the data signal input end, the second conductive end of the third switch tube is electrically connected to the first conductive end of the second switch tube, the control end of the fourth switch tube is electrically connected to the i-th scan line, and the first conductive end of the fourth switch tube is electrically connected to the second conductive end of the second switch tube; the second switch tube is turned on under the control of the first node, and the third switch tube and the fourth switch tube are turned on under the control of the scan signal output by the i-th scan line to control the data signal to be transmitted to the first node through the third switch tube, the second switch tube and the fourth switch tube in sequence, so as to charge the first node to a preset potential, and the second capacitor is used to maintain the voltage of the first node.

[0011] Optionally, the first light-emitting control module includes a fifth switch tube, and the second light-emitting control module includes a sixth switch tube; the control end of the fifth switch tube is electrically connected to the light-emitting control end, the first conductive end of the fifth switch tube is electrically connected to the driving voltage end, the second conductive end of the fifth switch tube is electrically connected to the first conductive end of the second switch tube, the control end of the sixth switch tube is electrically connected to the light-emitting control end, the first conductive end of the sixth switch tube is electrically connected to the second conductive end of the second switch tube, and the second conductive end of the sixth switch tube is electrically connected to the light-emitting module. The fifth switch tube and the sixth switch tube are used to be turned on under the control of the light-emitting control end, so that the driving voltage end transmits the driving voltage to the light-emitting module via the fifth switch tube, the second switch tube and the sixth switch tube to drive the light-emitting module to emit light.

[0012] Optionally, the pixel unit also includes a first reset module and a second reset module, the first reset module includes a seventh switch tube, the second reset module includes an eighth switch tube, the control end of the seventh switch tube is electrically connected to the ixth scan line, the first conductive end of the seventh switch tube is electrically connected to the first voltage end, the second conductive end of the seventh switch tube is electrically connected to the first node, and the seventh switch tube is used to be turned on under the control of the scan signal output by the ixth scan line to control the first voltage end to initialize and adjust the second switch tube, and to pre-charge the first node; the control end of the eighth switch tube is electrically connected to the i-th scan line, the first conductive end of the eighth switch tube is electrically connected to the second voltage end, the second conductive end of the eighth switch tube is electrically connected to the light-emitting module, and the eighth switch tube is used to be turned on under the control of the scan signal output by the i-th scan line to control the second voltage end to initialize and adjust the light-emitting module.

[0013] Optionally, each frame image display process of the pixel unit includes a continuous first time period, a second time period and a third time period. The first time period is an initialization stage. In the first time period, the first switch tube and the seventh switch tube are turned on, and the second data line is electrically connected to the data signal input end through the first switch tube. The first voltage end outputs the first voltage signal to the first node and the control end of the second switch tube through the seventh switch tube, which is used to initialize and adjust the second switch tube and pre-charge the first node; the second time period is a data writing stage. In the second time period, the second switch tube, the third switch tube, the fourth switch tube and the eighth switch tube are turned on, and the fifth switch tube, the sixth switch tube and the seventh switch tube are turned off. The data signal output from the data signal input end is transmitted to the first node through the third switch tube, the second switch tube and the fourth switch tube, which is used to pull up the first node to a preset potential. At the same time, the second voltage end initializes and adjusts the light-emitting module through the eighth switch tube. The third time period is the light-emitting stage. In the third time period, the light-emitting control end controls the fifth switch tube and the sixth switch tube to be turned on, and the third switch tube, the fourth switch tube and the eighth switch tube are turned off. The driving voltage output by the driving voltage end is transmitted to the light-emitting module through the fifth switch tube, the second switch tube and the sixth switch tube in sequence to control the light-emitting module to emit light.

[0014] An embodiment of the present application also provides a display device, including a cover plate, a host and the aforementioned foldable display panel, the foldable display panel is stacked between the cover plate and the host, the foldable display panel includes a light emitting side and a backlight side, the cover plate covers the light emitting side of the foldable display panel, the host is arranged on the backlight side of the foldable display panel, and the host is used to control the foldable display panel to display images.

[0015] Compared with the existing technical problems, by setting a groove on the flexible substrate, and setting the corresponding two data driving circuits at the two ends of the groove respectively, and laying the data line in the groove, an "island-chain" structure is formed between the data driving circuit and the data line. When the second display area is bent or stretched, the data line follows the groove to bend and deform, which can effectively reduce the tearing effect on the data line, thereby improving the service life of the data line, and an auxiliary data line, i.e., the second data line, is also set for each pixel unit, so that when an abnormality occurs in the first data line, the second data line can be enabled to transmit the data signal, thereby further reducing the problem of black spots or black screen in the second display area due to data line abnormality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0018] Figure 2 for Figure 1 A schematic diagram of the plan layout of the foldable display panel corresponding to the first display area;

[0019] Figure 3 It is a schematic diagram of the bending structure of the second display area in the related art;

[0020] Figure 4 is a schematic diagram of the layout of a data driving circuit in a second display area in the related art;

[0021] Figure 5 A method provided in the embodiment of the present application is as follows Figure 1 A schematic top view of the second display area;

[0022] Figure 6 A method provided in the embodiment of the present application is as follows Figure 1 A schematic cross-sectional view of the second display area along the AA' direction;

[0023] Figure 7 for Figure 6 Schematic diagram of equivalent circuit of pixel unit;

[0024] Figure 8 for Figure 7 Middle signal output timing diagram.

[0025] Reference numerals:

[0026] Display device-100, foldable display panel-10, cover plate-20, host-30, folding radius-R, first display area-10A, second display area-10B, first direction-X, second direction-Y, flexible substrate-101, driving layer-102, display layer-103, m data lines-S1~Sm, n scanning lines-G1~Gn, data driving circuit-12, groove-13, pixel unit-15, scanning driving circuit-18, selection module-150, first data line-S1, second data line-S2, data signal input terminal-SIN, driving module-151, first control module-152, second control module-153, first light-emitting control module-154, second light-emitting control Module-155, light-emitting module-156, first reset module-157, second reset module-158, first node-Q1, second node-Q2, driving voltage terminal-VDD, low voltage terminal-VSS, ground terminal-E, first switch tube-T1, second switch tube-T2, third switch tube-T3, fourth switch tube-T4, fifth switch tube-T5, sixth switch tube T6, seventh switch tube-T7, eighth switch tube-T8, light-emitting control terminal-EM, i-th scanning line-Gi, ix-th scanning line-Gi-x, first capacitor-C1, second capacitor-C2, first voltage terminal-V1, second voltage terminal-V2, light-emitting element-D, first time period-t1, second time period-t2, third time period-t3. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0028] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0029] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present application are used to distinguish different objects, rather than to describe a specific order.

[0030] In addition, the terms "include", "may include", "contain", or "may include" used in the present application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "include" or "contain" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions. In addition, when describing the embodiments of the present application, "may" is used to indicate "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] The embodiment of the present application provides a foldable display device. The display device includes but is not limited to a notebook, a tablet personal computer, a mobile phone, a laptop computer, a personal digital assistant (PDA), a personal computer, a navigator, a vehicle-mounted device, a wearable device (such as a smart watch), an augmented reality (AR) device, a virtual reality (VR) device, and any other product or component with a display function. The embodiment of the present application does not impose any special restrictions on the specific form of the above-mentioned display device.

[0033] Exemplarily, under different usage requirements, the display device can be unfolded to a flat state, folded to a folded state, or in an intermediate state between the flat state and the folded state. That is, the display device has at least two states, namely, the flat state and the folded state. In some cases, the display device may further include a third state, namely, an intermediate state between the flat state and the folded state. It is understandable that the intermediate state may be any one or more states between the flat state and the folded state, rather than a unique state.

[0034] For the convenience of explanation, the following embodiments are all described by taking a mobile phone as an example of the display device, which cannot be regarded as a specific limitation on the structural form of the display device.

[0035] See also Figure 1 , Figure 1 A schematic diagram of the structure of a display device 100 provided in an embodiment of the present application.

[0036] like Figure 1 As shown, the display device 100 includes a foldable display panel 10, a cover plate 20 and a host 30 ( Figure 3 ), the foldable display panel 10 is stacked between the cover plate 20 and the host 30, the foldable display panel 10 includes a light emitting side and a backlight side, the cover plate 20 covers the light emitting side of the foldable display panel, the host 30 is arranged on the backlight side of the foldable display panel, the host 30 is used to control the foldable display panel to display images, wherein the host 30 mainly includes a battery, a main board and various sensors.

[0037] The foldable display panel 10 may be a flexible display screen, and the types of the flexible display screen include various types, which can be selected and set according to actual needs. Exemplarily, the flexible display screen may be an organic light emitting diode (OLED) display screen. As a self-luminous display screen, the OLED display screen does not need to be provided with a backlight module (BLM), which is conducive to reducing the thickness and structural complexity of the display device 100.

[0038] The foldable display panel 10 includes a substrate and a film layer stacking structure (including but not limited to pixel circuits, light-emitting devices, shift registers, etc.) disposed on the substrate. The substrate can be made of a flexible resin material, including but not limited to polyethylene terephthalate (PET), and the cover plate 20 can be made of a transparent, flexible material, including but not limited to polyimide. In this way, the substrate and the cover plate 20 can be bendable.

[0039] The foldable display panel 10 includes two first display areas 10A and a second display area 10B, and the second display area 10B is located between the two first display areas 10A. The first display area 10A and the second display area 10B can be arranged alternately in sequence along the first direction X, and the second display area 10B can extend along the second direction Y. Accordingly, the bending axis of the second display area 10B is along the second direction Y. Both of the first display areas 10A can rotate around the second display area 10B as an axis, so that the display device 100 can be folded or unfolded. The first direction X and the second direction Y are parallel to the plane where the foldable display panel 10 is located, and the first direction X and the second direction Y are perpendicular to each other.

[0040] In this embodiment, the configuration of the foldable display panel in the first display area 10A is the same as the configuration of the existing OLED display panel, and this embodiment will not be described in detail here.

[0041] See also Figure 2 , Figure 2 for Figure 1 Schematic diagram of the plan layout of the foldable display panel corresponding to the first display area 10A.

[0042] like Figure 2 As shown, the first display area 10A is provided with a plurality of pixel units 15 arranged in an array, m data lines S1 -Sm and n scan lines G1 -Gn, where m and n are natural numbers greater than 1.

[0043] The n scan lines G1-Gn extend along the second direction Y and are insulated from each other and arranged in parallel along the first direction X. The m data lines S1-Sm extend along the first direction X and are insulated from each other and arranged in parallel along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0044] Corresponding to the non-display area of ​​the foldable display panel 10 , the foldable display panel 10 further includes a data driving circuit 12 and a scan driving circuit 18 for driving the pixel unit to display an image.

[0045] The data driving circuit 12 is electrically connected to the m data lines S1-Sm, and is used to transmit the data signal (Data) to be displayed to the plurality of pixel units 15 in the form of data voltage through the m data lines S1-Sm. The pixel units 15 emit light to display images according to the received data signals.

[0046] The scan driving circuit 18 is used to be electrically connected to the n scan lines G1-Gn, and is used to output scan signals through the n scan lines G1-Gn for controlling when the pixel unit 15 receives the data signal. The scan driving circuit 18 outputs scan signals from the n scan lines G1-Gn in sequence according to the scan cycle.

[0047] See also Figure 3 , Figure 3 FIG. 1 is a schematic diagram of the bending structure of the second display area 10B in the related art.

[0048] like Figure 3 As shown, the display device 100 generally includes a foldable display panel 10, a cover plate 20 and a host 30. The thickness of the entire display device 100 is much greater than the thickness of the foldable display panel 10 and the cover plate 20. Therefore, when the display device 100 is bent, whether it is folded inward or outward, in the bending area (second display area 10B), the host 30, the foldable display panel 10, the cover plate 20 and the bending radii R1, R2, and R3 are different. Since the first display areas 10A at both ends are fixed, the foldable display panel 10 will be pulled or squeezed, thereby causing damage to the foldable display panel 10.

[0049] See also Figure 4 , Figure 4 FIG. 1 is a schematic diagram of the layout of the driving circuit in the second display area 10B in the related art.

[0050] like Figure 4 As shown, corresponding to the second display area 10B, the foldable display panel 10 includes at least two data driving circuits 12 and a plurality of data lines S, wherein the two data driving circuits 12 are arranged correspondingly at a preset distance along the first direction X, and the data line S is connected between the two data driving circuits 12 for transmitting data signals. The data line S is arranged in an "S" shape between the two data driving circuits 12 to adapt to the stretching or compression effect when the second display area 10B is bent. However, even if the data line S between the data driving circuits 12 is set to an "S" shape, there is still a risk of tearing damage after multiple bendings at the maximum bending moment, and the data line S is longer due to the data line S being set to an "S" shape, which easily leads to a problem of reduced resolution.

[0051] Based on this, the embodiment of the present application provides a bending area that can be stretched and deformed to avoid squeezing the first display areas on both sides, and provides a data line setting method to increase the service life of the data line.

[0052] Please also read Figure 5 and Figure 6 , Figure 5 A method provided in the embodiment of the present application is as follows Figure 1 A schematic top view of the second display area 10B in FIG. Figure 6 A method provided in the embodiment of the present application is as follows Figure 1 A schematic cross-sectional view of the second display area 10B along the AA' direction.

[0053] like Figure 5 and Figure 6 As shown, corresponding to the second display area 10B, the foldable display panel 10 includes a flexible substrate 101, a driving layer 102 and a display layer 103, wherein the driving layer 102 includes at least two data driving circuits 12 and a plurality of data lines S, wherein the two data driving circuits 12 are arranged at a preset distance along the first direction X, and the two data driving circuits 12 are connected by at least one data line S.

[0054] The flexible substrate 101 is further provided with a groove 13 between the two data driving circuits 12, and the data line S is arranged along the inner wall of the groove 13, that is, the laying shape of the data line S is consistent with the contour of the groove 13, and the two data driving circuits 12 and the data line S form an "island-chain" structure. The side of the data line S facing away from the inner wall of the groove 13 can also be filled with elastic material to flatten the backplane.

[0055] In an exemplary embodiment, the cross-section of the groove 13 can be set according to specific needs, for example, it can be set to an inverted trapezoid, an arc, a semicircle, etc., and the present application does not limit this.

[0056] In this embodiment, the driving layer 102 is also provided with a plurality of scanning lines G, and the display layer 103 is also provided with a plurality of pixel units 15. The pixel unit 15 is connected to at least one scanning line G and at least one data line S. The pixel unit 15 is used to receive a scanning signal from the correspondingly connected scanning line G and receive a data signal from the correspondingly connected data line S under the control of the scanning signal, so as to perform image display according to the data signal.

[0057] By setting a groove 13 on the flexible substrate 101, and setting two corresponding data driving circuits 12 at the two ends of the groove 13 respectively, and laying the data line S in the groove 13, an "island-chain" structure is formed between the data driving circuit 12 and the data line S. When the second display area 10B is bent or stretched, the data line S follows the groove 13 to bend and deform. Compared with the pulling deformation of the aforementioned S-shaped data line when bending, the tearing effect on the data line S can be effectively reduced, thereby improving the service life of the data line S.

[0058] See also Figure 7 , Figure 7 for Figure 6 Schematic diagram of the equivalent circuit of the pixel unit.

[0059] like Figure 7As shown, the pixel unit 15 includes a selection module 150, the selection module 150 is electrically connected to the first data line S1, the second data line S2 and the data signal input terminal SIN, and the selection module 150 is used to control the first data line S1 or the second data line S2 to transmit the data signal to the data signal input terminal SIN. When the first data line S1 can normally transmit the data signal to the data signal input terminal SIN, the selection module 150 controls the second data line S2 to maintain a state of stopping the transmission of the data signal. When the first data line S1 is broken and cannot normally transmit the data signal to the data driving circuit 12 ( Figure 3 ) is transmitted to the data signal input terminal SIN, the selection module 150 controls the second data line S2 to receive the data signal from the data driving circuit 12 and transmits it to the data signal input terminal SIN.

[0060] In the present embodiment, the first data line S1 and the second data line S2 merely represent two data lines connected to the same pixel unit 15 among the plurality of data lines in the second display area 10B, and do not represent a specific arrangement order of the data lines.

[0061] By setting two data lines corresponding to the pixel unit 15, when one of the data lines is broken and cannot transmit the data signal, the other data line is controlled to continue transmitting the data signal, thereby avoiding the problem of poor display caused by the data line breaking after multiple bending of the second display area 10B, and further improving the service life of the data line in the second display area 10B.

[0062] The pixel unit 15 also includes a driving module 151, a first control module 152, a second control module 153 and a first node Q1, wherein the first control module 152 is electrically connected to the data signal input terminal SIN and the driving module 151, the driving module 151 is electrically connected to the second control module 153 and the first node Q1, and the first control module 152 is used to receive a data signal from the data signal input terminal SIN and transmit it to the first node Q1 through the driving module 151 and the second control module 153, so as to charge the first node Q1 to a preset potential.

[0063] The pixel unit 15 also includes a first light-emitting control module 154, a second light-emitting control module 155 and a light-emitting module 156. The first light-emitting control module 154 is electrically connected to the driving voltage terminal VDD, the light-emitting control terminal EM and the driving module 151. The second light-emitting control module 155 is electrically connected to the driving module 151, the light-emitting module 156 and the light-emitting control terminal EM. The first light-emitting control module 154 is used to receive a driving voltage from the driving voltage terminal VDD and transmit it to the driving module 151 under the control of the light-emitting control terminal EM. The driving module 151 controls the driving voltage to be transmitted to the second light-emitting control module 155 according to the data signal. The second light-emitting control module 155 is used to transmit the driving voltage to the light-emitting module 156 under the control of the light-emitting control terminal EM to drive the light-emitting module 156 to emit light.

[0064] The pixel unit 15 further includes a first reset module 157 and a second reset module 158. The first reset module 157 is electrically connected to the first voltage terminal V1 and the first node Q1, and is used to receive a first voltage signal from the first voltage terminal V1 and transmit it to the first node Q1, and transmit it to the driving module 151 through the first node Q1, and is used to initialize the first node Q1 and the driving module 151, and pre-charge the first node Q1. The second reset module 158 is electrically connected to the second voltage terminal V2 and the light emitting module 156, and is used to receive a second voltage signal from the second voltage terminal V2 and transmit it to the light emitting module 156, and is used to initialize the light emitting module 156.

[0065] Specifically, the selection module 150 includes a first switch tube T1 and a first capacitor C1, wherein the control end of the first switch tube T1 is electrically connected to the ixth scan line Gi-x and the first data line S1, the first conductive end of the first switch tube T1 is electrically connected to the second data line S2, and the second conductive end of the first switch tube T1 is electrically connected to the data signal input terminal SIN. The first switch tube T1 is used to be turned on under the control of the scan signal output by the ixth scan line Gi-x, and turned on when the first data line S1 stops transmitting the data signal, so as to control the second data line S2 to be electrically connected to the data signal input terminal SIN, and the first switch tube T1 is turned off when the first data line S1 transmits the data signal, so as to control the second data line S2 to be electrically disconnected from the data signal input terminal SIN, so that the second data line S2 can be effectively controlled to transmit the data signal when the first data line S1 is broken. The first capacitor C1 is electrically connected between the ground terminal E and the control end of the first switch tube T1, and is used to maintain the voltage of the control end of the first switch tube T1.

[0066] Wherein, i>x, and i and x are integers greater than or equal to 1.

[0067] The driving module 151 includes a second switch tube T2 and a second capacitor C2, the control end of the second switch tube T2 is electrically connected to the first node Q1, the first conductive end of the second switch tube T2 is electrically connected to the first light-emitting control module 154, the second conductive end of the second switch tube T2 is electrically connected to the second light-emitting control module 155, and the second switch tube T2 is used to be turned on when the first node Q1 is at a preset potential. The second capacitor C2 is electrically connected between the first node Q1 and the driving voltage terminal VDD, and the second capacitor C2 is used to maintain the voltage of the first node Q1.

[0068] The first control module 152 includes a third switch tube T3, and the second control module 153 includes a fourth switch tube T4. The control end of the third switch tube T3 is electrically connected to the i-th scan line Gi, the first conductive end of the third switch tube T3 is electrically connected to the data signal input end VIN, and the second conductive end of the third switch tube T3 is electrically connected to the first conductive end of the second switch tube T2. The control end of the fourth switch tube T4 is electrically connected to the i-th scan line Gi, the first conductive end of the fourth switch tube T4 is electrically connected to the second conductive end of the second switch tube T2, and the second conductive end of the fourth switch tube T4 is electrically connected to the first node Q1.

[0069] The third switch tube T3 and the fourth switch tube T4 are used to be turned on under the control of the scan signal output by the i-th scan line Gi, and the third switch tube T3 is used to receive the data signal from the data signal input terminal VIN and transmit it to the first node Q1 through the second switch tube T2 and the fourth switch tube T4, so as to charge the first node Q1 to a preset potential.

[0070] The first light-emitting control module 154 includes a fifth switch tube T5, the second light-emitting control module 155 includes a sixth switch tube T6, and the light-emitting module 156 includes a light-emitting element D, wherein the control end of the fifth switch tube T5 is electrically connected to the light-emitting control end EM, the first conductive end of the fifth switch tube T5 is electrically connected to the driving voltage end VDD, and the second conductive end of the fifth switch tube T5 is electrically connected to the first conductive end of the second switch tube T2. The control end of the sixth switch tube T6 is electrically connected to the light-emitting control end, the first conductive end of the sixth switch tube T6 is electrically connected to the second conductive end of the second switch tube T2, the second conductive end of the sixth switch tube T6 is electrically connected to the anode of the light-emitting element D, and the cathode of the light-emitting element D is electrically connected to the low voltage end VSS. The fifth switch tube T5 and the sixth switch tube T6 are used to be turned on under the control of the light-emitting control end EM, and the fifth switch tube T5 is used to receive the driving voltage from the driving voltage end VDD and transmit it to the light-emitting element D through the second switch tube T2 and the sixth switch tube T6, so as to drive the light-emitting element D to emit light.

[0071] The first reset module 157 includes a seventh switch tube T7, and the second reset module 158 includes an eighth switch tube T8, wherein the control end of the seventh switch tube T7 is electrically connected to the ixth scan line Gi-x, the first conductive end of the seventh switch tube T7 is electrically connected to the first voltage end V1, and the second conductive end of the seventh switch tube T7 is electrically connected to the first node Q1. The seventh switch tube T7 is used to be turned on under the control of the scan signal output by the ixth scan line to receive the first voltage signal from the first voltage end V1 and transmit it to the second capacitor C2 and the second switch tube T2, so as to initialize the second switch tube T2 and pre-charge the first node Q1, or pre-charge the second capacitor C2.

[0072] The second reset module 158 includes an eighth switch tube T8, a control end of the eighth switch tube T8 is electrically connected to the i-th scan line Gi, a first conductive end of the eighth switch tube T8 is electrically connected to the second voltage end V2, and a second conductive end of the eighth switch tube T8 is electrically connected to the second node Q2, i.e., the anode of the light-emitting element D. The eighth switch tube T8 is used to be turned on under the control of the scan signal output by the i-th scan line Gi, so as to receive the second voltage signal from the second voltage end V2 and transmit it to the second node Q2, so as to initialize and adjust the anode of the light-emitting element D.

[0073] In this embodiment, the first switch tube T1 to the eighth switch tube T8 are all P-type transistors, which are used to be turned on under the control of a low-level signal. Of course, the type of the switch tube can also be set according to specific needs. For example, one or more switch tubes can also be set as N-type transistors, and this application does not limit this. Among them, the data signal is a high-level signal. When the first data line transmits a data signal, the first switch tube T1 can be controlled to remain in the cut-off state. When the first data line breaks and stops transmitting the data signal, the first switch tube T1 can be controlled to be turned on, thereby controlling the second data line S2 to be electrically connected to the data signal input terminal SIN. In addition, the voltage difference between the data signal and the driving voltage is less than the threshold voltage of the second switch tube T2, so the second switch tube T2 can be controlled to be turned on.

[0074] See also Figure 8 , Figure 8 for Figure 7 Middle signal output timing diagram.

[0075] like Figure 8As shown, the pixel unit 15 includes a continuous first time period t1, a second time period t2 and a third time period t3 during each frame of image display, wherein the first time period t1 is an initialization stage. In the first time period t1, the ixth scanning line Gi-x outputs a scanning signal to control the first switch tube T1 and the seventh switch tube T7 to be turned on, the second data line S2 is electrically connected to the data signal input terminal SIN via the first switch tube T1, and the first voltage terminal V1 outputs a first voltage signal to the first node Q1 and the control terminal of the second switch tube T2 via the seventh switch tube T7, which is used to initialize and adjust the second switch tube T2 and control the second switch tube T2 to be turned on, and to pre-charge the second capacitor C2.

[0076] The second period t2 is a data writing stage. In the second period t2, the i-th scan line Gi outputs a scan signal to control the third switch tube T3, the fourth switch tube T4 and the eighth switch tube T8 to be turned on, and the fifth switch tube T5, the sixth switch tube T6 and the seventh switch tube T7 to be turned off. The data signal output by the data signal input terminal SIN is transmitted to the first node Q1 through the third switch tube T3, the second switch tube T2 and the fourth switch tube T4, and is used to pull up the first node Q1 to a preset potential to control the second switch tube T2 to maintain a conducting state, and the second capacitor C2 is used to control the first node Q1 to maintain a preset potential. The second voltage terminal V2 initializes and adjusts the second node Q2 through the eighth switch tube T8.

[0077] The third time period t3 is the light-emitting stage. In the third time period t3, the light-emitting control terminal EM controls the fifth switch tube T5 and the sixth switch tube T6 to be turned on, and the third switch tube T3, the fourth switch tube T4 and the eighth switch tube T8 are turned off. The driving voltage output by the driving voltage terminal VDD is transmitted to the light-emitting element D through the fifth switch tube T5, the second switch tube T2 and the sixth switch tube T6 in sequence to drive the light-emitting element D to emit light.

[0078] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A foldable display panel, characterized in that: The device comprises two first display areas and one second display area, wherein the second display area is arranged between the two first display areas along a first direction, the two first display areas rotate around the second display area as an axis, and the first display area and the second display area comprise a plurality of pixel units arranged in an array; Corresponding to the second display area, the foldable display panel includes a flexible substrate, a driving layer and a display layer stacked in sequence, the driving layer includes at least two data driving circuits and multiple data lines, the two data driving circuits are arranged at opposite sides of the surface of the flexible substrate at a preset distance along the first direction, the flexible substrate is provided with at least one groove at a position between the two data driving circuits, the data line is arranged along the inner wall of the groove and connects the two data driving circuits, and the data line is used to transmit the data signal provided by the data driving circuit to the pixel unit arranged in the display layer to drive the pixel unit to perform image display.

2. The foldable display panel according to claim 1, wherein: The pixel unit is connected to a first data line and a second data line, and the pixel unit includes a selection module, and the selection module is electrically connected to the first data line, the second data line and a data signal input terminal. The selection module is used to control the first data line or the second data line to transmit the data signal to the data signal input terminal. When the first data line is abnormal, the selection module controls the second data line to continue transmitting the data signal to the data signal input terminal.

3. The foldable display panel according to claim 2, wherein: The pixel unit also includes a driving module, a first control module, a second control module and a first node, the first control module is electrically connected to the data signal input terminal and the driving module, the driving module is electrically connected to the second control module and the first node, the first control module is used to receive the data signal from the data signal input terminal and transmit it to the first node through the driving module and the second control module, and is used to charge the first node to a preset potential.

4. The foldable display panel according to claim 3, wherein: The pixel unit further includes a first light-emitting control module, a second light-emitting control module and a light-emitting module, wherein the first light-emitting control module is electrically connected to a driving voltage terminal, a light-emitting control terminal and the driving module; the second light-emitting control module is electrically connected to the driving module, the light-emitting module and the light-emitting control terminal; The first light-emitting control module is used to receive the driving voltage from the driving voltage end and transmit it to the driving module under the control of the control end. The driving module controls the driving voltage to be transmitted to the second light-emitting control module according to the data signal. The second light-emitting control module is used to transmit the driving voltage to the light-emitting module under the control of the light-emitting control end to drive the light-emitting module to emit light.

5. The foldable display panel according to claim 2, wherein: The driving layer further comprises a plurality of scanning lines sequentially arranged along the first direction and extending along a second direction, wherein the first direction is perpendicular to the second direction; The selection module includes a first switch tube and a first capacitor, the control end of the first switch tube is electrically connected to the ixth scan line and the first data line, the first conductive end of the first switch tube is electrically connected to the second data line, the second conductive end of the first switch tube is electrically connected to the data signal input end, and the first capacitor is electrically connected between the control end of the first switch tube and the ground end, wherein i>x≥1, and i and x are integers; The first switch tube is used to be turned on under the control of the scan signal output by the ixth scan line, and to be turned on when the first data line stops transmitting the data signal, so as to control the second data line to be electrically connected to the data signal input end. When the first data line transmits the data signal, the first switch tube is turned off, so as to control the second data line to be electrically disconnected from the data signal input end.

6. The foldable display panel according to claim 4, wherein: The driving module includes a second switch tube and a second capacitor, the first control module includes a third switch tube, the second control module includes a fourth switch tube, the control end of the second switch tube is electrically connected to the first node, the first conductive end of the second switch tube is electrically connected to the third switch tube, and the second conductive end of the second switch tube is electrically connected to the fourth switch tube; The control end of the third switch tube is electrically connected to the i-th scan line, the first conductive end of the third switch tube is electrically connected to the data signal input end, the second conductive end of the third switch tube is electrically connected to the first conductive end of the second switch tube, the control end of the fourth switch tube is electrically connected to the i-th scan line, and the first conductive end of the fourth switch tube is electrically connected to the second conductive end of the second switch tube; The second switch tube is turned on under the control of the first node, and the third switch tube and the fourth switch tube are turned on under the control of the scan signal output by the i-th scan line to control the data signal to be transmitted to the first node through the third switch tube, the second switch tube and the fourth switch tube in sequence, so as to charge the first node to a preset potential, and the second capacitor is used to maintain the voltage of the first node.

7. The foldable display panel according to claim 6, wherein: The first light emitting control module includes a fifth switch tube, and the second light emitting control module includes a sixth switch tube; The control end of the fifth switch tube is electrically connected to the light-emitting control end, the first conductive end of the fifth switch tube is electrically connected to the driving voltage end, the second conductive end of the fifth switch tube is electrically connected to the first conductive end of the second switch tube, the control end of the sixth switch tube is electrically connected to the light-emitting control end, the first conductive end of the sixth switch tube is electrically connected to the second conductive end of the second switch tube, and the second conductive end of the sixth switch tube is electrically connected to the light-emitting module. The fifth switch tube and the sixth switch tube are used to be turned on under the control of the light-emitting control end, so that the driving voltage end transmits the driving voltage to the light-emitting module through the fifth switch tube, the second switch tube and the sixth switch tube, so as to drive the light-emitting module to emit light.

8. The foldable display panel according to claim 7, wherein: The pixel unit further includes a first reset module and a second reset module, the first reset module includes a seventh switch tube, the second reset module includes an eighth switch tube, the control end of the seventh switch tube is electrically connected to the ixth scan line, the first conductive end of the seventh switch tube is electrically connected to the first voltage end, the second conductive end of the seventh switch tube is electrically connected to the first node, the seventh switch tube is used to be turned on under the control of the scan signal output by the ixth scan line, so as to control the first voltage end to initialize and adjust the second switch tube, and pre-charge the first node; The control end of the eighth switch tube is electrically connected to the i-th scan line, the first conductive end of the eighth switch tube is electrically connected to the second voltage end, the second conductive end of the eighth switch tube is electrically connected to the light-emitting module, and the eighth switch tube is used to be turned on under the control of the scan signal output by the i-th scan line to control the second voltage end to initialize and adjust the light-emitting module.

9. The foldable display panel according to claim 8, wherein: The image display process of each frame of the pixel unit includes a continuous first period, a second period and a third period, wherein the first period is an initialization stage, during which the first switch tube and the seventh switch tube are turned on, the second data line is electrically connected to the data signal input terminal via the first switch tube, and the first voltage terminal outputs a first voltage signal to the first node and the control terminal of the second switch tube via the seventh switch tube, so as to perform initialization adjustment on the second switch tube and pre-charge the first node; The second period is a data writing stage. In the second period, the second switch tube, the third switch tube, the fourth switch tube and the eighth switch tube are turned on, the fifth switch tube, the sixth switch tube and the seventh switch tube are turned off, and the data signal output by the data signal input end is transmitted to the first node through the third switch tube, the second switch tube and the fourth switch tube, so as to pull up the first node to a preset potential. At the same time, the second voltage end performs initialization adjustment on the light emitting module through the eighth switch tube; The third time period is the light-emitting stage. In the third time period, the light-emitting control end controls the fifth switch tube and the sixth switch tube to be turned on, and the third switch tube, the fourth switch tube and the eighth switch tube are turned off. The driving voltage output by the driving voltage end is transmitted to the light-emitting module through the fifth switch tube, the second switch tube and the sixth switch tube in sequence to control the light-emitting module to emit light.

10. A display device, characterized in that: It includes a cover plate, a host and a foldable display panel as described in claims 1-9, the foldable display panel is stacked between the cover plate and the host, the foldable display panel includes a light-emitting side and a backlight side, the cover plate covers the light-emitting side of the foldable display panel, the host is arranged on the backlight side of the foldable display panel, and the host is used to control the foldable display panel to display images.

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