Display panel, preparation method of display panel and display device

Abstract

The embodiment of the invention provides a display panel, a preparation method of the display panel and a display device.The display panel comprises a display area and a non-display area which at least encloses part of the display area, and the end, away from the display area, of the non-display area is bent to the backlight side of the display area. The non-display area comprises a first bending area and a second bending area which are located on the two sides of the display area in the first direction, and the first direction intersects with the thickness direction of the display panel; the display panel comprises a substrate and a light-emitting layer in the thickness direction, the light-emitting layer is located on one side of the substrate, and the light-emitting layer comprises a light-emitting unit located in a display area.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display panel, a method for preparing a display panel, and a display device. Background Art

[0002] Organic Light Emitting Diode (OLED) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the display effects of current OLED display products need to be improved. Summary of the invention

[0004] The embodiments of the present application provide a display panel, a method for manufacturing a display panel, and a display device, aiming to improve the display effect of the display panel.

[0005] An embodiment of the first aspect of the present application provides a display panel, comprising a display area and a non-display area that at least encloses a portion of the display area, wherein one end of the non-display area facing away from the display area is bent to a backlight side of the display area, and the non-display area comprises a first bending area and a second bending area located on both sides of the display area in a first direction, and the first direction is arranged to intersect with a thickness direction of the display panel; wherein, the display panel comprises a substrate and a light-emitting layer in the thickness direction, the light-emitting layer is located on one side of the substrate, and the light-emitting layer comprises a light-emitting unit located in the display area.

[0006] According to an implementation manner of the first aspect of the present application, the non-display area also includes a third bending area and / or a fourth bending area located on both sides of the display area in the second direction, and the first direction, the second direction and the thickness direction of the display panel are arranged to intersect each other; optionally, the non-display area also includes a binding area located on the side of the first bending area away from the display area, and a solder pad is provided on the binding area; optionally, the second bending area includes a third side away from the display area, and the third side includes at least one of an arc segment or a fold line segment; optionally, the arc segment includes at least one of a circular arc segment or an elliptical arc segment; optionally, the fold line segment includes at least two connected straight line segments; optionally, the orthographic projection shape of the second bending area after flattening includes at least one of a triangle, a trapezoid, and a semi-ellipse.

[0007] According to the implementation scheme of the first aspect of the present application, the first bending zone includes a first edge facing the display area, the third bending zone includes a second edge facing the display area, and a first angle is formed between the first edge and the second edge; the first bending zone and the third bending zone are disconnected on the side away from the first angle.

[0008] According to the implementation scheme of the first aspect of the present application, it also includes: an array layer, located between the substrate and the light-emitting layer, and a first routing line is provided on the array layer, and at least part of the first routing line extends from the display area to the first bending area; a first electrode layer, including a first electrode located on the side of the light-emitting unit away from the substrate, and the first electrode is electrically connected to the light-emitting unit; a power supply routing line, located in the first bending area and / or the second bending area, and the power supply routing line is electrically connected to the first electrode; optionally, at least part of the power supply routing line is located in the second bending area, and at least part of the first electrode extends from the display area to the second bending area and is electrically connected to the power supply routing line; optionally, the first routing line is a gate drive routing line.

[0009] According to the implementation scheme of the first aspect of the present application, the power supply lines are all located in the first bending area; the display panel also includes an auxiliary electrode layer located on the side of the first electrode layer away from the substrate, the auxiliary electrode layer includes auxiliary electrodes, at least part of the auxiliary electrodes extend from the display area to the first bending area, and at least part of the auxiliary electrodes are electrically connected to the first electrode and the power supply lines.

[0010] According to the implementation scheme of the first aspect of the present application, a first groove is provided on the surface of the substrate facing away from the light-emitting layer, and at least part of the first groove is located in the first bending zone; optionally, a second groove is provided on the surface of the substrate facing away from the light-emitting layer, and at least part of the second groove is located in the second bending zone.

[0011] According to the implementation scheme of the first aspect of the present application, it also includes: a dam, which is located on the same side of the substrate as the light-emitting layer, at least part of the dam is located between the display area and the first bending area, and the height of the dam in the thickness direction is greater than or equal to 1.5μm and less than or equal to 2.5μm; optionally, the dam includes a third surface, a first surface facing the substrate and a second surface away from the substrate, the third surface connects the first surface and the second surface, and the angle between the third surface and the first surface is less than or equal to 30°.

[0012] According to an implementation scheme of the first aspect of the present application, the non-display area also includes an overflow area that encloses at least a portion of the display area; the display panel also includes a second encapsulation layer in the thickness direction and is located on the side of the light-emitting layer away from the substrate, and at least a portion of the second encapsulation layer extends from the display area to the overflow area; optionally, the material of the second encapsulation layer includes an organic material; optionally, the display panel does not include a dam.

[0013] An embodiment of the second aspect of the present application also provides a method for preparing a display panel, which is used to prepare the display panel provided by any of the above-mentioned embodiments of the first aspect, and the preparation method includes the following steps: providing a substrate; preparing a sacrificial layer on one side of the substrate, and a protrusion is provided on the side of the sacrificial layer facing away from the substrate; setting a first material on the side of the sacrificial layer facing away from the substrate; curing and peeling off the first material to obtain a substrate, and a first groove and / or a second groove is provided on the substrate to be aligned with the protrusion.

[0014] An embodiment of the third aspect of the present application further provides a display device, comprising the display panel provided by any of the embodiments of the first aspect.

[0015] The display panel provided in the embodiment of the present application includes a display area and a non-display area enclosing at least part of the display area, the non-display area is bent at one end away from the display area to the backlight side of the display area, the non-display area includes a first bending area and a second bending area located on both sides of the display area in a first direction, and the first direction is arranged to intersect with the thickness direction of the display panel; wherein the display panel includes a substrate and a light-emitting layer in the thickness direction, the light-emitting layer is located on one side of the substrate, and the light-emitting layer includes a light-emitting unit located in the display area. The present application makes the non-display areas on both sides of the display area in the first direction both bending areas, and the bending areas on both sides can be bent toward the backlight side of the display panel to make the two side frames of the final product visually narrower, thereby improving the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0017] Figure 1 is a top view of a display panel provided in an embodiment of the present application;

[0018] Figure 2 It is an example Figure 1 A top view of the middle display panel after being flattened in the non-display area;

[0019] Figure 3 It is an example Figure 1 Sectional view at AA in the middle;

[0020] Figure 4 It is an example Figure 3 A partial enlarged cross-sectional view at point B in the middle;

[0021] Figure 5 It is an example Figure 1 Sectional view at CC;

[0022] Figure 6 Another example is Figure 1 A top view of the middle display panel after being flattened in the non-display area;

[0023] Figure 7 This is another example Figure 1 A top view of the middle display panel after being flattened in the non-display area;

[0024] Figure 8 Another example is Figure 3 A partial enlarged cross-sectional view at point B in the middle;

[0025] Fig. 9 It is an example Figure 2 A partial enlarged cross-sectional view at DD in the middle;

[0026] Fig.10 It is an example Figure 2 A partial enlarged cross-sectional view of the EE in the middle;

[0027] Fig.11 Another example is Figure 2 A partial enlarged cross-sectional view of the EE in the middle;

[0028] Fig.12 is a method flow chart of an exemplary method for preparing a display panel;

[0029] Fig.13 is a cross-sectional view of an exemplary base plate, sacrificial layer, and substrate.

[0030] Description of reference numerals:

[0031] 10. display panel; 11. first side; 12. second side; 13. third side; 14. notch; 20. substrate; 21. sacrificial layer; 211. protrusion;

[0032] 100, substrate; 110, first groove;

[0033] 200, array layer; 210, first routing;

[0034] 300, light-emitting layer; 310, light-emitting unit;

[0035] 400, pad;

[0036] 500, first electrode layer; 510, first electrode;

[0037] 600, second electrode layer; 610, second electrode;

[0038] 700, auxiliary electrode layer; 710, auxiliary electrode;

[0039] 800, encapsulation layer; 810, first encapsulation layer; 820, second encapsulation layer; 830, third encapsulation layer;

[0040] 900, dam; 910, first surface; 920, second surface; 930, third surface;

[0041] AA, display area; NA, non-display area; NA1, first bending area; NA2, second bending area; NA3, third bending area; NA4, fourth bending area; NA5, overflow area; BA, binding area; θ, first angle;

[0042] x, first direction; y, second direction; z, thickness direction. DETAILED DESCRIPTION

[0043] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0044] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] In order to better understand this application, Figures 1 to 13 The display panel, the method for manufacturing the display panel and the display device according to the embodiment of the present application are described in detail, wherein x is the first direction, y is the second direction, and z is the thickness direction of the display panel.

[0047] Please also read Figures 1 to 4 , Figure 1 is a top view of a display panel provided in an embodiment of the present application; Figure 2 It is an example Figure 1 A top view of the middle display panel after being flattened in the non-display area; Figure 3 It is an example Figure 1 Sectional view at AA in the middle; Figure 4 It is an example Figure 3 A partial enlarged cross-sectional view of point B in the middle.

[0048] like Figures 1 to 4 As shown, an embodiment of the first aspect of the present application provides a display panel 10, including a display area AA and a non-display area NA that at least encloses a portion of the display area AA, wherein one end of the non-display area away from the display area is bent to the backlight side of the display area, and the non-display area includes a first bending area and a second bending area located on both sides of the display area in a first direction, and the first direction (x direction in the figure) is arranged to intersect with a thickness direction (z direction in the figure) of the display panel; wherein the display panel includes a substrate and a light-emitting layer in the thickness direction, the light-emitting layer is located on one side of the substrate, and the light-emitting layer includes a light-emitting unit located in the display area.

[0049] Optionally, the material of the substrate 100 includes transparent polyimide.

[0050] Optionally, a side of the substrate 100 facing away from the array layer 200 is a backlight side of the display panel 10 , and both the first bending area NA1 and the second bending area NA2 are bent toward the backlight side of the display panel 10 .

[0051] The display panel 10 provided in the present application makes the non-display areas NA on both sides of the display area AA in the first direction x both be bending areas. The bending areas on both sides can be bent toward the backlight side of the display panel AA so that the two side frames of the final product are visually narrowed, thereby improving the display effect of the display panel 10.

[0052] Please refer to Figure 5 , Figure 5 It is an example Figure 1 Cross-sectional view at CC.

[0053] like Figures 1 to 5 As shown, in some optional embodiments, the non-display area NA further includes a third bending area NA3 and / or a fourth bending area NA4 located on both sides of the display area AA in the second direction y, and the first direction x, the second direction y and the thickness direction z of the display panel are arranged to intersect each other. In this embodiment, the non-display area NA includes both the third bending area NA3 and the fourth bending area NA4 as an example for explanation.

[0054] Optionally, the non-display area NA further includes a binding area BA located on a side of the first bending area NA1 away from the display area AA, and a pad 400 is disposed on the binding area BA.

[0055] Optionally, the first direction x is a vertical direction, and the second direction y is a left-right direction. The first bending area NA1 is located below the display area AA, the second bending area NA2 is located above the display area AA, the third bending area NA3 is located on the left side of the display area AA, and the fourth bending area NA4 is located on the right side of the display area AA. It can be understood that the first bending area NA1 is located at the lower frame of the display panel 10, the second bending area NA2 is located at the upper frame of the display panel 10, the third bending area NA3 is located at the left frame of the display panel 10, and the fourth bending area NA4 is located at the right frame of the display panel 10.

[0056] Optionally, the first bending area NA1, the second bending area NA2, the third bending area NA3 and the fourth bending area NA4 are all bent toward the backlight side of the display panel 10, and the side of the second bending area NA2, the third bending area NA3 and the fourth bending area NA4 away from the display area AA are all connected to the pad 400.

[0057] The display panel 10 provided in the present application makes the non-display areas NA around the display area AA all bending areas. The surrounding bending areas can be bent toward the backlight side of the display panel 10 to make the surrounding frames of the final product visually narrower, thereby further improving the display effect of the display panel 10.

[0058] Please refer to Figure 2 , Figure 6 and Figure 7 , Figure 6 Another example is Figure 1 A top view of the middle display panel after being flattened in the non-display area; Figure 7 This is another example Figure 1 A top view of the display panel after it is flattened in the non-display area.

[0059] like Figure 2 , Figure 6 , Figure 7 As shown, the second bending area NA2 includes a third side 13 away from the display area, and the third side 13 includes at least one of an arc segment or a fold line segment.

[0060] Optionally, the arc segment includes at least one of a circular arc segment or an elliptical arc segment.

[0061] Optionally, the broken line segment includes at least two connected straight line segments.

[0062] Optionally, the orthographic projection shape of the second bending area NA2 after flattening includes a semi-ellipse (eg Figure 2 As shown), triangle (as Figure 6 as shown) and trapezoidal (as Figure 7 at least one of the above (shown).

[0063] Optionally, the orthographic projection shapes of the first bending area NA1, the third bending area NA3 and the fourth bending area NA4 after being flattened are the same as the orthographic projection shape of the second bending area NA2 after being flattened.

[0064] Optionally, the orthographic projection shape of the third bending area NA3 and the fourth bending area NA4 after being flattened is the same as the orthographic projection shape of the second bending area NA2 after being flattened, and the orthographic projection shape of the first bending area NA1 after being flattened is different from the orthographic projection shape of the second bending area NA2 after being flattened. Since the first bending area NA1 needs to be provided with a binding area BA and a supporting pad 400, its projection area can be larger than that of the other three bending areas.

[0065] The display panel 10 provided in the present application reduces the overlapping area between the bending areas after bending by making the orthographic projection shape of the bending area after flattening into a semi-ellipse, a triangle or a trapezoid, thereby reducing the thickness of the display panel 10.

[0066] Please continue to refer to Figure 2 In some optional embodiments, the first bending area NA1 includes a first edge 11 facing the display area AA, and the third bending area NA3 includes a second edge 12 facing the display area AA. A first angle θ is formed between the first edge 11 and the second edge 12, and a notch 14 is formed in the non-display area NA on a side away from the first angle θ.

[0067] Optionally, the first bending area NA1 and the third bending area NA3 are disconnected on the side away from the first angle θ.

[0068] Optionally, the non-display area NA is provided with notches 14 at four corners.

[0069] The display panel 10 provided in the present application has a notch 14 at the top corner of the non-display area NA, thereby reducing the probability of wrinkles being generated at the top corner between two adjacent bending areas when the two bending areas are bent, thereby reducing the defect rate of the display panel 10. By disconnecting the first bending area NA1 and the third bending area NA3 on the side away from the first angle θ, the mutual influence between the first bending area NA1 and the third bending area NA3 when the non-display area NA is bent is reduced, thereby further reducing the defect rate of the display panel 10.

[0070] Please continue to refer to Figure 4In some optional embodiments, the display panel 10 further includes an array layer 200, a first electrode layer 500 and a power supply line (not shown), the array layer 200 is located between the substrate 100 and the light-emitting layer 300, and a first line 210 electrically connected to the light-emitting unit 310 is provided in the array layer 200, and at least part of the first line 210 extends from the display area AA to the non-display area NA. The first electrode layer 500 includes a first electrode 510 located on the side of the light-emitting unit 310 away from the substrate 100, and the first electrode 510 is electrically connected to the light-emitting unit 310. The power supply line is located in the first bending area NA1 and / or the second bending area NA2, and the power supply line is electrically connected to the first electrode 510.

[0071] Optionally, the array layer includes a first conductive layer, a second conductive layer, and a third conductive layer that are stacked. An insulating layer is provided between adjacent conductive layers. A drive device layer is also provided on the array layer, and a pixel drive circuit is provided in the drive device layer, and the pixel drive circuit includes a transistor and a storage capacitor. The transistor includes a semiconductor, a gate, a source and a drain. The storage capacitor includes a first plate and a second plate. As an example, the gate and the first plate can be located in the first conductive layer, the second plate can be located in the second conductive layer, and the source and the drain can be located in the third conductive layer. The first routing 210 can be a routing in any conductive layer in the array layer 200, such as a signal line or a data line.

[0072] Optionally, the first wiring 210 is a gate drive wiring.

[0073] Optionally, the first bending area NA1 , the second bending area NA2 , the third bending area NA3 and the fourth bending area NA4 are all provided with a first wiring 210 extending from the display area AA to the non-display area NA, and the first wiring 210 is electrically connected to the pad 400 .

[0074] Optionally, at least part of the power supply line is located in the second bending area NA2, and at least part of the first electrode 510 extends from the display area AA to the second bending area NA2 and is electrically connected to the power supply line.

[0075] Optionally, the power supply line is located in the second bending area NA2, the third bending area NA3 and the fourth bending area NA4.

[0076] Optionally, the display panel 10 further includes a second electrode layer 600, and the second electrode layer 600 includes a second electrode 610 located on the side of the light-emitting unit 310 facing the substrate 100. The first electrode 510 and the second electrode 610 are both electrically connected to the light-emitting unit 310, and the second electrode 610 and the first electrode 510 provide power to the light-emitting unit 310 to drive the light-emitting unit 310 to emit light. Specifically, one of the second electrode 610 and the first electrode 510 is an anode, and the other is a cathode. The embodiment of the present application is described by taking the second electrode 610 as an anode and the first electrode 510 as a cathode.

[0077] The display panel 10 provided in the present application increases the wiring area of ​​the first wiring 210 in the non-display area NA by setting the first wiring 210 in each of the four bending areas, thereby reducing the wiring difficulty of the first wiring 210 in the non-display area NA. By bending the four bending areas to the backlight side of the display panel 10 and connecting to the same pad 400, the first wiring 210 in the four bending areas can be connected to the external circuit through the pad 400, and the number of pads can be effectively reduced, thereby reducing the thickness and volume of the display panel 10. By locating the gate drive wiring in the first bending area NA1 and the power supply wiring in other bending areas, the wiring of the non-display area NA is dispersed, thereby reducing the wiring density and wiring difficulty of the sub-display area NA, thereby effectively reducing the visual width of the entire non-display area NA1 after bending.

[0078] Please refer to Figure 8 , Figure 8 Another example is Figure 3 A partial enlarged cross-sectional view of point B in the middle.

[0079] like Figure 8 As shown, in some optional embodiments, the power supply lines are all located in the first bending area NA1. The display panel 10 also includes an auxiliary electrode layer 700 located on the side of the first electrode layer 500 away from the substrate 100, and the auxiliary electrode layer 700 includes an auxiliary electrode 710, at least part of the auxiliary electrode 710 extends from the display area AA to the first bending area NA1 and electrically connects the first electrode 510 and the power supply lines.

[0080] Optionally, the power supply line and the first line 210 are both located in the first bending area NA1, and no lines are provided in other bending areas.

[0081] Optionally, the display panel 10 further includes an encapsulation layer 800, which is located on the side of the first electrode layer 500 facing away from the substrate 100. The encapsulation layer 800 includes a first encapsulation layer 810, and the material of the first encapsulation layer 810 includes an inorganic material, that is, the first encapsulation layer 810 is an inorganic encapsulation layer, and the inorganic encapsulation layer can be prepared by a chemical vapor deposition method, which can improve the compactness of the first encapsulation layer 810, thereby improving the encapsulation effect.

[0082] Optionally, the encapsulation layer 800 further includes a second encapsulation layer 820 located on the side of the first encapsulation layer 810 away from the substrate 100, and the material of the second encapsulation layer 820 includes an organic material. That is, the second encapsulation layer 820 is an organic encapsulation layer, and the organic encapsulation layer can be prepared by inkjet printing, so that the encapsulation layer 800 has a suitable thickness. The auxiliary electrode 710 is located between the first encapsulation layer 810 and the second encapsulation layer 820.

[0083] Optionally, the encapsulation layer 800 further includes a third encapsulation layer 830 located on the side of the second encapsulation layer 820 away from the substrate 100, and the material of the third encapsulation layer 830 includes an inorganic material. That is, the third encapsulation layer 830 is an inorganic encapsulation layer, and further adding an inorganic encapsulation layer outside the organic encapsulation layer can further improve the encapsulation effect.

[0084] Optionally, the first encapsulation layer 810 and the third encapsulation layer 30 are made of the same material, so that the first encapsulation layer 810 and the third encapsulation layer 830 can be prepared using the same equipment, thereby simplifying the preparation process of the display panel 10 .

[0085] The display panel 10 provided by the present application reduces the difficulty of bending other bending areas by making the power supply line and the first line 210 both located in the first bending area NA1, and no lines are set in other bending areas, thereby reducing the visual width of other bending areas after bending. At least part of the auxiliary electrode 710 is extended from the display area AA to the first bending area NA1 and electrically connects the first electrode 510 and the power supply line, and the auxiliary electrode 710 is located between the first encapsulation layer 810 and the second encapsulation layer 820, thereby reducing the probability of short circuit between the auxiliary electrode 710 and other conductive materials.

[0086] In other embodiments, no routing is provided in the four bending regions, the first routing 210 on the array layer 200 passes through the substrate 100 in the display area AA and is electrically connected to the pad 400 on the backlight side of the display panel 10, and the power routing passes through the array layer 200 and the substrate 100 in the display area AA and is also electrically connected to the pad 400 on the backlight side of the display panel 10. The first routing 210 and the power routing are electrically connected to the external circuit through the pad 400.

[0087] The display panel 10 provided in the present application reduces the difficulty of bending all the bending areas by not setting wiring in the four bending areas, thereby reducing the visual width of all the bending areas after bending.

[0088] Please refer to Fig. 9 , Fig. 9 It is an example Figure 2 A partial enlarged cross-sectional view at point D in the middle.

[0089] like Fig. 9 As shown, in some optional embodiments, a first concave groove 110 is provided on the surface of the substrate 100 facing away from the light emitting layer 300 , and at least a portion of the first groove 110 is located in the first bending area NA1 .

[0090] Optionally, a second groove (not shown) is provided on the surface of the substrate 100 facing away from the light-emitting layer 300 , and at least a portion of the second groove is located in the second bending area NA2 .

[0091] Optionally, grooves are provided on the substrate 100 located in the third bending area NA3 and the fourth bending area NA3.

[0092] Optionally, the thickness of the substrate 100 is greater than or equal to 10 μm, and the thickness of the groove is greater than or equal to 5 μm.

[0093] Alternatively, the grooves may be prepared by a laser cutting process, such as CO2 laser cutting or UV laser cutting.

[0094] The display panel 10 provided in the present application sets a groove on the substrate 100 located in the bending area, and uses the groove to thin the bending area to reduce the bending stress of the bending area, thereby reducing the bending radius of the bending area and reducing the width of the non-display area NA.

[0095] Please refer to Fig.10 , Fig.10 It is an example Figure 2 A partial enlarged cross-sectional view at EE in the middle.

[0096] like Fig.10 As shown, in some optional embodiments, the display panel 10 further includes a dam 900, the dam 900 and the array layer 200 are located on the same side of the substrate 100, and at least part of the dam 900 is located between the display area AA and the first bending area NA1. The height of the dam 900 in the thickness direction is greater than or equal to 1.5 μm and less than or equal to 2.5 μm.

[0097] Optionally, the dam 900 includes a third surface 930, a first surface 910 facing the substrate 100, and a second surface 920 facing away from the substrate 100, the third surface 930 connects the first surface 910 and the second surface 920, and the angle between the third surface 930 and the first surface 910 is less than or equal to 30°.

[0098] Optionally, the orthographic projection of the second surface 920 on the substrate 100 is located within the orthographic projection of the first surface 910 on the substrate 100 , and the cross-sectional shape of the dam 900 is a trapezoid.

[0099] Optionally, the dam 900 is disposed around the display area AA, and the angles formed between the third surface 930 and the first surface 910 in the dam 900 located on both sides of the display area AA in the first direction x and on both sides of the second direction y are less than or equal to 30°.

[0100] Optionally, the orthographic projection of the dam 900 on the substrate 100 is located within the orthographic projection of the first encapsulation layer 810 on the substrate 100 , and the orthographic projection of the dam 900 on the substrate 100 is located within the orthographic projection of the third encapsulation layer 830 on the substrate 100 .

[0101] Optionally, the number of dams 900 disposed around the display area AA is not limited, for example, one or two dams 900 may be provided. When the number of dams 900 is two, the heights of the dams 900 may be different, and the height of the dam 900 close to the display area AA is lower than the height of the dam 900 away from the display area AA. For example, the height of the dam 900 close to the display area AA is 1.5 μm, and the height of the dam 900 away from the display area AA is 2.5 μm.

[0102] In the related art, the height of the dam is generally 3.5-4.5μm, and the slope angle is 40°. The height of the dam 900 in the present application is shorter than that of the dam in the related art, and the slope angle is gentler. Among them, the dam 900 in the present application can be processed on the upper surface of the dam 900 to reduce its height, and the processing method can be laser cutting or etching. In addition, after the dam 900 is solidified, it can be first hot-melted to make it semi-solid, and then the dam 900 will flow around to make the height shorter and the slope angle larger, and then it will be re-solidified and formed. After the dam 900 becomes shorter, it can reduce the stress of the dam 900 when the bending zone where it is located is bent, thereby reducing the difficulty of bending the bending zone, and reducing the probability of the first encapsulation layer 810 and the third encapsulation layer 830 above the dam 900 breaking when the non-display area NA is bent.

[0103] The display panel 10 provided in the present application is provided with a dam 900 surrounding the display area AA. The dam 900 is used to prevent the liquid organic encapsulation material from overflowing when the second encapsulation layer 820 is prepared, thereby ensuring the encapsulation effect of the encapsulation layer 800. By making the height of the dam 900 in the thickness direction greater than or equal to 1.5 μm and less than or equal to 2.5 μm, the height of the dam 900 is reduced, thereby reducing the probability of the first encapsulation layer 810 and the third encapsulation layer 830 above the dam 900 breaking when the non-display area NA is bent. By making the angle between the third surface 930 and the first surface 910 less than or equal to 30°, the slope angle of the dam 900 is reduced, and the height of the dam 900 can also be reduced.

[0104] Please refer to Fig.11 , Fig.11 Another example is Figure 2 A partial enlarged cross-sectional view at EE in the middle.

[0105] like Fig.11 As shown, in other embodiments, the display panel 10 may not include the dam 900. The non-display area also includes an overflow area NA5 enclosing at least a portion of the display area AA. When the second encapsulation layer 820 is prepared, part of the liquid organic encapsulation material will overflow to the overflow area NA5, so that after the second encapsulation layer 820 is formed, at least a portion of the second encapsulation layer 820 extends from the display area AA to the overflow area NA5.

[0106] Please refer to Fig.12 and Fig.13 , Fig.12 is a method flow chart of an exemplary method for preparing a display panel; Fig.13 is a cross-sectional view of an exemplary base plate, sacrificial layer, and substrate.

[0107] like Fig.12 and Fig.13 As shown, the embodiment of the second aspect of the present application further provides a method for preparing a display panel, which is used to prepare any of the above display panels 10, and the preparation method comprises the following steps:

[0108] Step S01, providing a substrate 20;

[0109] Step S02, preparing a sacrificial layer 21 on one side of the substrate 20, and a protrusion 211 is provided on the side of the sacrificial layer 21 facing away from the substrate;

[0110] Step S03, disposing a first material on a side of the sacrificial layer 21 facing away from the substrate 20;

[0111] Step S04 , curing and peeling off the first material to obtain a substrate 100 , on which a first groove 110 and / or a second groove aligned with the protrusion 211 are provided.

[0112] Optionally, the substrate 20 is a glass substrate, the material of the sacrificial layer 21 includes amorphous silicon, and the first material includes transparent polyimide.

[0113] Optionally, in step S03 , the first material is disposed on a side of the sacrificial layer 21 facing away from the substrate 20 by a slit coating process.

[0114] The method for preparing a display panel provided in the present application utilizes a sacrificial layer with protrusions, so that when a first material is coated on the surface of the sacrificial layer through a slit, the first material forms a groove at the position where the protrusion is aligned, and then the first material is cured and peeled off from the sacrificial layer to obtain a substrate 100 with a groove.

[0115] In some other embodiments, the grooves on the substrate 100 may also be prepared by laser cutting, such as carbon dioxide laser cutting or ultraviolet laser cutting.

[0116] The embodiment of the third aspect of the present application also provides a display device, including the display panel of any of the above-mentioned embodiments of the first aspect. Since the display device provided by the embodiment of the third aspect of the present application includes the display panel of any of the above-mentioned embodiments, the display device provided by the embodiment of the third aspect of the present application has the beneficial effects of the display panel of any of the above-mentioned embodiments, which will not be repeated here.

[0117] The display device in the embodiments of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles, and other devices with display functions.

[0118] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, characterized in that: The display panel comprises a display area and a non-display area enclosing at least a portion of the display area, wherein one end of the non-display area away from the display area is bent to a backlight side of the display area, and the non-display area comprises a first bending area and a second bending area located on both sides of the display area in a first direction, and the first direction is arranged to intersect with a thickness direction of the display panel; The display panel includes a substrate and a light-emitting layer in the thickness direction, the light-emitting layer is located on one side of the substrate, and the light-emitting layer includes a light-emitting unit located in the display area.

2. The display panel according to claim 1, characterized in that: The non-display area further includes a third bending area and / or a fourth bending area located on both sides of the display area in the second direction, and the first direction, the second direction and the thickness direction of the display panel are intersected in pairs; Preferably, the non-display area further comprises a binding area located on a side of the first bending area away from the display area, and a pad is provided on the binding area; Preferably, the second bending area includes a third side away from the display area, and the third side includes at least one of an arc segment or a fold line segment; Preferably, the arc segment includes at least one of a circular arc segment or an elliptical arc segment; Preferably, the broken line segment includes at least two connected straight line segments; Preferably, the orthographic projection shape of the second bending zone after flattening includes at least one of a triangle, a trapezoid, and a semi-ellipse.

3. The display panel according to claim 2, characterized in that: The first bending zone includes a first edge facing the display area, the third bending zone includes a second edge facing the display area, and a first angle is formed between the first edge and the second edge; the first bending zone and the third bending zone are disconnected on a side away from the first angle.

4. The display panel according to claim 1, characterized in that: Also includes: An array layer, located between the substrate and the light-emitting layer, wherein a first wiring is disposed on the array layer, and at least a portion of the first wiring extends from the display area to the first bending area; A first electrode layer, comprising a first electrode located at a side of the light-emitting unit away from the substrate, the first electrode being electrically connected to the light-emitting unit; a power supply line, located in the first bending area and / or the second bending area, the power supply line being electrically connected to the first electrode; Preferably, at least part of the power supply line is located in the second bending area, and at least part of the first electrode extends from the display area to the second bending area and is electrically connected to the power supply line; Preferably, the first wiring is a gate drive wiring.

5. The display panel according to claim 4, characterized in that: The power supply lines are all located in the first bending area; The display panel also includes an auxiliary electrode layer located on the side of the first electrode layer away from the substrate, the auxiliary electrode layer includes auxiliary electrodes, at least part of which extends from the display area to the first bending area, and at least part of which electrically connects the first electrode and the power supply line.

6. The display panel according to claim 1, characterized in that: A first groove is provided on a surface of the substrate facing away from the light-emitting layer, and at least a portion of the first groove is located in the first bending area; Preferably, a second groove is provided on a surface of the substrate on a side facing away from the light-emitting layer, and at least a portion of the second groove is located in the second bending region.

7. The display panel according to claim 1, characterized in that: Also includes: a dam, which is located on the same side of the substrate as the light-emitting layer, at least part of which is located between the display area and the first bending area, and a height of the dam in the thickness direction is greater than or equal to 1.5 μm and less than or equal to 2.5 μm; Preferably, the dam includes a third surface, a first surface facing the substrate and a second surface facing away from the substrate, the third surface connects the first surface and the second surface, and an angle between the third surface and the first surface is less than or equal to 30°.

8. The display panel according to claim 1, characterized in that: The non-display area also includes an overflow area enclosing at least a portion of the display area; The display panel further comprises a second encapsulation layer located on a side of the light-emitting layer away from the substrate in the thickness direction, and at least a portion of the second encapsulation layer extends from the display area to the overflow area; Preferably, the material of the second encapsulation layer includes organic material; Preferably, the display panel does not include a dam.

9. A method for preparing a display panel, used for preparing the display panel according to any one of claims 1 to 8, characterized in that: The steps include: providing a substrate; A sacrificial layer is prepared on one side of the substrate, and a protrusion is provided on the side of the sacrificial layer facing away from the substrate; a first material is provided on the side of the sacrificial layer facing away from the substrate; The first material is solidified and peeled off to obtain a substrate, on which a first groove and / or a second groove aligned with the protrusion are provided.

10. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 8.

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