Display panel and preparation method thereof

Abstract

The invention provides a display panel and a preparation method thereof, and the display panel comprises a screen body which comprises a display part, a bending part and a bonding part which are connected in sequence, the display part and the bonding part are arranged at an interval, and the bending part is connected between the display part and the bonding part; the first supporting layer and the second supporting layer are arranged between the display part and the bonding part, the first supporting layer is attached to the display part, and the second supporting layer is attached to the bonding part; wherein the projection of the bending part in the first direction and the projection of the display part in the first direction have an overlapping area. According to the display panel provided by the invention, the stress of the bending part can be reduced under the condition of the same bending radius, so that the probability of metal wire breakage and film layer tearing in the bending part is reduced, and finally, the risks of black spots and bright lines are reduced; and the bending radius can also be reduced under the same stress condition, so that a narrower frame can be realized.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) is an active light-emitting device with a sandwich structure consisting of multiple organic layers and electrodes on both sides. At present, display screens based on AMOLED (Active-matrix organic light-emitting diode) have been commercialized in the fields of smart phones, watches and laptops.

[0003] However, the performance of existing displays needs to be improved. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a display panel that is beneficial to reducing the stress and bending radius of the bending portion, thereby achieving a narrower frame.

[0005] Based on the above purpose, the present application provides a display panel, which includes:

[0006] The screen body comprises a display portion, a bending portion and a bonding portion connected in sequence, wherein the display portion and the bonding portion are arranged at intervals from each other, and the bending portion is connected between the display portion and the bonding portion; a projection of the display portion in a first direction and a projection of the bonding portion in the first direction at least partially overlap; wherein the first direction is a thickness direction of the display panel;

[0007] a first supporting layer and a second supporting layer, wherein the first supporting layer and the second supporting layer are arranged between the display portion and the bonding portion, and the first supporting layer is attached to the display portion, and the second supporting layer is attached to the bonding portion; a projection of the first supporting layer in a first direction and a projection of the second supporting layer in the first direction at least partially overlap;

[0008] There is an overlapping area between the projection of the bending portion in the first direction and the projection of the display portion in the first direction.

[0009] The bending portion includes a main bending portion and an over-pull portion which are continuously arranged, a projection of the main bending portion in the first direction does not overlap with a projection of the display portion in the first direction, and a projection of the over-pull portion in the first direction is located within a projection of the display portion in the first direction;

[0010] Preferably, the bending portion comprises a wiring area, wherein a portion of the wiring area is located in the main bending portion and a portion of the wiring area is located in the over-pull portion.

[0011] In one embodiment, the thickness of the display panel and the bending radius of the main bending portion satisfy the following relationship:

[0012] 0.3d≤r4≤0.5d

[0013] Wherein, d is the thickness of the display panel, and r4 is the bending radius of the main bending portion.

[0014] In one embodiment, the projection of the over-pull portion in the first direction is a rectangle;

[0015] Preferably, the bending radius of the main bending portion is greater than the width of the rectangle;

[0016] Preferably, the width of the rectangle is 20-200 μm.

[0017] In one embodiment, the width of the bending portion is 500-1200 μm.

[0018] In one embodiment, the bending portion forms a free space with the first supporting layer and the second supporting layer, so that the bending portion can bend freely.

[0019] In one embodiment, the bending portion includes a first end and a second end, the first end is connected to the display portion, and the second end is connected to the bonding portion, and the bending portion is freely bent so that the curvature radius of the second end is greater than the curvature radius of the first end.

[0020] In one embodiment, the display panel further includes:

[0021] The adhesive layer is partially located between the display portion and the first supporting layer, partially located between the bonding portion and the second supporting layer, and partially located inside the bending portion.

[0022] In one embodiment, the first supporting layer and the second supporting layer are formed by etching the same supporting layer.

[0023] Based on the same inventive concept, the present application also discloses a method for preparing a display panel, which comprises:

[0024] A display panel to be bent is provided, wherein the display panel to be bent comprises a screen body and a supporting layer which are stacked, wherein a display portion, a portion to be bent and a bonding portion which are sequentially connected are arranged on the screen body;

[0025] Providing a first supporting layer and a second supporting layer;

[0026] The portion to be bent is bent to form a bending portion, so that the display portion and the bonding portion are spaced apart from each other, and the projection of the display portion in a first direction at least partially overlaps with the projection of the bonding portion in the first direction; the first supporting layer and the second supporting layer are located between the display portion and the bonding portion, and the projection of the first supporting layer in the first direction at least partially overlaps with the projection of the second supporting layer in the first direction; wherein, there is an overlapping area between the projection of the bending portion in the first direction and the projection of the display portion in the first direction, and the first direction is the thickness direction of the display panel to be bent.

[0027] In one embodiment, setting the portion to be bent includes setting a main bending portion, and setting an over-pull portion connected to the main bending portion;

[0028] The step of bending the portion to be bent to form a bent portion comprises:

[0029] Bend the portion to be bent to form a bending portion so that the projection of the main bending portion in the first direction does not overlap with the projection of the display portion in the first direction, and over-pull the over-pull portion to below the display portion by an over-pull method so that the projection of the over-pull portion in the first direction is located within the projection of the display portion in the first direction.

[0030] In one embodiment, the setting of the first supporting layer and the second supporting layer includes: etching the supporting layer to remove the area on the supporting layer corresponding to the portion to be bent, so as to form a first supporting layer on the supporting layer in the area corresponding to the display portion, and forming a second supporting layer on the supporting layer in the area corresponding to the bonding portion.

[0031] Based on the same inventive concept, the present application also discloses a display device, which includes any one of the display panels described above.

[0032] Compared with the prior art, the display panel provided by the present application has an overlapping area between the projection of the bending portion in the first direction and the projection of the display portion in the first direction, that is, part of the bending portion is hidden on the non-display side of the display panel, which can reduce the stress of the bending portion under the condition of the same bending radius, thereby reducing the probability of metal wiring breakage and film tearing in the bending portion, and ultimately reducing the risk of black spots and bright lines; it can also reduce the bending radius under the same stress conditions, which is conducive to achieving a narrower frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a schematic diagram of a related display panel before being bent;

[0035] Figure 2 for Figure 1 Schematic diagram of the layer structure of the display panel;

[0036] Figure 3 is a schematic diagram of a related display panel after being bent;

[0037] Figure 4 for Figure 3 Schematic diagram of the layer structure of the display panel;

[0038] Figure 5 is a schematic diagram of the layer structure of another related display panel after being bent;

[0039] Figure 6 is a schematic diagram of the layer structure of another related display panel after being bent;

[0040] Figure 7 A schematic diagram of the layer structure of a display panel after being bent according to an embodiment of the present application;

[0041] Figure 8 for Figure 7 Schematic diagram of the layer structure of the display panel before bending;

[0042] Fig. 9 for Figure 8 Schematic diagram of the layer structure of the display panel before the groove area is formed;

[0043] Fig.10 A schematic diagram of the layer structure of a display panel before being bent provided by another embodiment of the present application;

[0044] Fig.11 A flow chart of a method for preparing a display panel provided in another embodiment of the present application.

[0045] Marking Description:

[0046] 100. Display panel; 1. Screen body; 10. Display part; 20. Bending part; 21. First end; 22. Second end; 23. Main bending part; 24. Over-pull part; 30. Bonding part; 40. Grooved area; 50. Support layer; 51. First support layer; 52. Second support layer; 60. Free space; 70. Adhesive layer; 80. Part to be bent; 200. Display panel to be bent. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0048] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] Please refer to Figure 1 and 2 As shown, a related display panel 100 includes a screen body 1, the screen body 1 includes a display part 10, a bending part 20 and a bonding part 30, a signal terminal is arranged in the display part 10, a bonding electrode is arranged in the bonding part 30, and the signal terminal and the binding electrode are electrically connected through a signal line.

[0050] In order to reduce the frame (usually the lower frame) of the display panel 100, the bonding portion 30 needs to be bent to the back of the display panel 100. Since the hardness of the support layer 50 is relatively large, Figure 2 As shown, in order to achieve the desired bending radius, the area corresponding to the bending portion 20 on the support layer 50 needs to be removed to form a groove area 40, and then the bending portion 20 is bent. The bent display panel 100 is shown in FIG. Figure 3 and 4 The width of the slotted area 40 is D1 , and the width of the slotted area 40 determines the width of the bent portion 20 .

[0051] Please refer to Figure 4As shown in the figure, in a related display panel 100, the bending portion 20 is bent into a semicircular arc with point o as the center and a radius of r1, wherein r1 is the bending radius. At the starting position of the bend (position a1 and position b1 in the figure), the screen body 1 undergoes a sudden change from a flat state to an arc state, and the thickness of the support layer 50 also undergoes a sudden change. Therefore, stress concentration occurs at the starting position of the bend, and the thickness of the screen body 1 is usually very thin, which can easily cause the signal line on the screen body 1 to break; especially when the bending shape is adjusted, the display portion 10 and the bonding portion 30 will be deformed along the bending shape. Figure 4 The -X and X directions in the figure make relative movements, which makes it easier for the screen body 1 to be subjected to a larger force at the a1 position and the b1 position, thereby causing the signal line to break.

[0052] Please refer to Figure 5 As shown, in another related display panel 100, when the thickness d of the display panel 100 remains unchanged, the width of the slotted area 40 is increased, that is, the width of the bent portion 20 is increased, so that the bent portion 20 is bent into an elliptical arc. At this time, the stress at the position a2 is less than Figure 4 The stress at position a1 and the stress at position b2 are less than Figure 4 However, the cost is that the bending radius r2 is larger than Figure 4 The bending radius r1 is not conducive to achieving a narrow frame.

[0053] Please refer to Figure 6 As shown, in another related display panel 100, when the thickness d of the display panel 100 remains unchanged, the width of the slotted area 40 is reduced, that is, the width of the bent portion 20 is reduced, so that the bent portion 20 is bent into an elliptical arc. At this time, the bending radius r3 is less than Figure 4 The bending radius r1 in the middle is conducive to achieving a narrower frame. However, it will cause the stress at position a3 to be greater than Figure 4 The stress at position a1 and the stress at position b3 are greater than Figure 4 The stress at position b1 is more likely to cause the signal line on the screen 1 to break.

[0054] Therefore, how to reduce the stress of the bending portion 20 while achieving a narrow frame is a problem that needs to be solved urgently.

[0055] To this end, the present application provides a display panel solution to solve the above problems.

[0056] Please refer to Figure 7As shown, a display panel 100 provided in an embodiment of the present application includes a screen body 1, a first supporting layer 51 and a second supporting layer 52. The screen body 1 includes a display portion 10, a bending portion 20 and a bonding portion 30 connected in sequence. The display portion 10 and the bonding portion 30 are arranged at intervals from each other, and the bending portion 20 is connected between the display portion 10 and the bonding portion 30. The first supporting layer 51 and the second supporting layer 52 are arranged between the display portion 10 and the bonding portion 30, and the first supporting layer 51 is attached to the display portion 10, and the second supporting layer 52 is attached to the bonding portion 30. The projection of the display portion 10 in the first direction (such as -Y or Y direction in the figure) at least partially overlaps with the projection of the bonding portion 30 in the first direction, and the projection of the first supporting layer 51 in the first direction at least partially overlaps with the projection of the second supporting layer 52 in the first direction. The first direction is the thickness direction of the display panel. The projection of the bending portion 20 in the first direction and the projection of the display portion 10 in the first direction have an overlapping area.

[0057] The display panel 100 provided in this embodiment has an overlapping area between the projection of the bending portion 20 in the first direction and the projection of the display portion 10 in the first direction, that is, a part of the bending portion 20 is hidden on the non-display side of the display panel 100, which can reduce the stress of the bending portion 20 under the condition of the same bending radius, thereby reducing the probability of metal wiring breakage and film tearing in the bending portion 20, and ultimately reducing the risk of black spots and bright lines; or, reducing the bending radius under the same stress condition is conducive to achieving a narrower frame.

[0058] Please continue to refer to Figure 7 As shown, in one embodiment, the bending portion 20 includes a main bending portion 23 and an over-tension portion 24 which are continuously arranged, the projection of the main bending portion 23 in the first direction does not overlap with the projection of the display portion 10 in the first direction, and the projection of the over-tension portion 24 in the first direction is located within the projection of the display portion 10 in the first direction. That is, the second supporting layer 52 shrinks in the X direction relative to the first supporting layer 51. Figure 4-6 As shown, in the direction perpendicular to the display panel 100 (-Y and Y directions in the figure), the left side of the second supporting layer 52 is flush with the left side of the first supporting layer 51, ensuring that the bending portion 20 is a vertically symmetrical structure. In this embodiment, the left side of the second supporting layer 52 and the left side of the first supporting layer 51 are vertically misaligned, so that part of the bending portion 20 is hidden to the non-display side (back side) of the display panel 100, so that the width of the bending portion 20 can be larger under the same bending radius, and the buffer range at the a4 position and the b4 position during the bending process is increased, effectively reducing the stress at the a4 position and the b4 position during the bending process, and can also reduce the bending radius under the same stress conditions, which is conducive to achieving a narrower frame.

[0059] Preferably, the bending portion 20 includes a wiring area, which is partially located in the main bending portion 23 and partially located in the over-pull portion 24. The wiring area is used to realize metal routing, and the entire bending portion 20 is the wiring area to ensure stable transmission of signals between the display portion 10 and the bonding portion 30.

[0060] Please continue to refer to Figure 7 As shown, in one embodiment, the thickness of the display panel 100 and the bending radius of the main bending portion 23 satisfy the following relationship:

[0061] 0.3d≤r4≤0.5d

[0062] Wherein, d is the thickness of the display panel 100, and r4 is the bending radius of the main bending portion 23. Under this relationship, the bending radius of the main bending portion 23 can be ensured to be small enough, and at the same time, the stress of the bending portion 20 can be reduced. Wherein, the bending radius r4 of the main bending portion 23 determines the frame width of the display panel 100, and the smaller the bending radius r4 of the main bending portion 23, the smaller the frame width of the corresponding display panel 100.

[0063] Optionally, r4=0.3d, r4=0.35d, r4=0.4d, r4=0.45d, r4=0.5d, etc.

[0064] In one of the embodiments, the projection of the over-pull portion 24 in the first direction is a rectangle, which means that the width of the over-pull portion 24 is constant along the direction perpendicular to the XY plane, thereby ensuring that the bending radius of the main bending portion 23 remains unchanged along the direction perpendicular to the XY plane, thereby ensuring the consistency of the width of the frame of the display panel 100.

[0065] Preferably, the width s of the rectangle is 20-200 μm, for example, 20 μm, 50 μm, 80 μm, 150 μm, 200 μm, etc. Within this width range, the stress on the bending portion 20 can be effectively reduced. In other embodiments, the width of the rectangle can be set as needed, without specific limitation.

[0066] Preferably, the width of the bending portion 20 is 500-1200 μm, for example, 500 μm, 800 μm, 1000 μm, 1200 μm, etc. Within this width range, the bending radius of the main bending portion 23 can be better achieved within a preset range, and at the same time, the stress of the bending portion 20 is within a preset range. In other embodiments, the width of the bending portion 20 can be set as needed, and is not specifically limited.

[0067] Preferably, the bending radius of the main bending portion 23 is greater than the width s of the rectangle to avoid excessive stress on one end of the bending portion 20 connected to the display portion 10 .

[0068] Please continue to refer to Figure 7As shown, the bending portion 20 and the first supporting layer 51 and the second supporting layer 52 form a free space 60, so that the bending portion 20 can bend freely, which is convenient for adjusting the bending radius. At the same time, no additional supporting structure is required, avoiding increasing process complexity and cost.

[0069] Specifically, a free space 60 is formed between the inner side of the bend of the bending portion 20 and the first supporting layer 51 and the second supporting layer 52, so that the bending portion 20 is supported and positioned only by the two ends respectively connected to the first supporting layer 51 and the second supporting layer 52, so as to facilitate the adjustment of the relative positions of the display portion 10 and the bonding portion 30 along the -X and X directions, thereby achieving the adjustment of the bending radius r4.

[0070] Please continue to refer to Figure 7 As shown, in one embodiment, the bending portion 20 includes a first end 21 and a second end 22, the first end 21 is connected to the display portion 10, and the second end 22 is connected to the bonding portion 30. The bending portion 20 is free to bend, so that the curvature radius of the second end 22 is greater than the curvature radius of the first end 21, ensuring that the stress at the position b4 of the second end 22 can be greatly reduced. At the same time, since part of the bending portion 20 is hidden to the non-display side of the display panel 100, the width of the bending portion 20 can be made larger while meeting the bending radius, thereby increasing the buffer range of the first end 21 and the second end 22 during the bending process, thereby reducing the stress at the position a4 of the first end 21.

[0071] For ease of understanding, Figure 6 The display panel 100, Figure 7 The display panel 100 in the embodiment is equivalent to increasing the width of the bending portion 20 by a part, and the width of the increased part is s. The increased part increases the buffer range of the first end 21 and the second end 22 during the bending process, thereby significantly reducing the stress at the a4 position of the first end 21 and the b4 position of the second end 22. At the same time, part of the bending portion 20 is hidden to the non-display side of the display panel 100 to avoid increasing the bending radius. Therefore, relative to Figure 6 The display panel 100 in this embodiment can effectively reduce the stress borne by the bending portion 20 at the same bending radius, thereby reducing the probability of metal wiring breakage and film tearing in the bending portion 20, and ultimately reducing the risk of black spots and bright lines.

[0072] Relative to Figure 5 The display panel 100, Figure 7 The display panel 100 in the embodiment is equivalent to keeping the width of the bent portion 20 unchanged and hiding part of the width of the bent portion 20 to the non-display side of the display panel 100, similar to Figure 5The second supporting layer 52 and the bonding portion 30 are pulled in the X direction by a distance s, so as to reduce the bending radius from r2 to r4, thereby achieving a significant reduction in the bending radius without causing a significant increase in the stress of the bending portion 20.

[0073] Likewise, relative to Figure 4 The display panel 100, Figure 7 The display panel 100 can reduce the bending radius and, at the same time, can also reduce the stress of the bending portion 20.

[0074] Reference Figure 8 , which is a schematic diagram of the structure of the display panel 100 before bending in one embodiment of the present application, wherein the width of the slotted area 40 is D2, and the bending portion 20 corresponds to the to-be-bent portion 80, that is, the width of the bending portion 20 is D2, relative to Figure 4 and Figure 6 The display panel 100 in this embodiment is equivalent to increasing the width of the slot area 40, and hiding the increased width part to the non-display side of the display panel 100. Figure 5 The display panel 100 in this embodiment is equivalent to keeping the width of the slot area 40 unchanged, and only hiding part of the width of the slot area 40 to the non-display side of the display panel 100.

[0075] Table 1

[0076]

[0077]

[0078] Referring to Table 1, in order to prove the effectiveness of the present invention, the inventors verified the display panel of the present invention with several related display panels. It can be seen that the display panel of the present invention can significantly reduce the stress of the bending portion 20, especially the stress at both ends of the bending portion 20.

[0079] Reference Fig. 9 As shown, in one embodiment, the first support layer 51 and the second support layer 52 are formed by etching the same support layer 50, and the preparation process is very simple, which reduces the difficulty of preparation. Specifically, the groove area 40 is formed by etching on the support layer 50, and then the bending portion 20 is bent. The first support layer 51 and the second support layer 52 after preparation have the same thickness and can play the same supporting effect.

[0080] Reference Fig.10As shown, in another embodiment, the display panel 100 further includes an adhesive layer 70, wherein the adhesive layer 70 is partially located between the display portion 10 and the first supporting layer 51, partially located between the bonding portion 30 and the second supporting layer 52, and partially located inside the bending portion 20. The adhesive layer 70 is used to bond the screen body 1 to the supporting layer 50. In addition, when the groove area 40 is formed, the adhesive layer 70 can prevent the screen body 1 from being damaged.

[0081] Based on the same inventive concept, another embodiment of the present application further discloses a method for preparing a display panel, the method comprising the following steps:

[0082] Step S10, providing a display panel 200 to be bent, wherein the display panel 200 to be bent comprises a screen body 1 and a support layer 50 which are stacked, wherein a display portion 10, a portion to be bent 80 and a bonding portion 30 which are sequentially connected are arranged on the screen body 1; the display panel 200 to be bent can refer to Fig. 9 .

[0083] Step S20 , providing a first supporting layer 51 and a second supporting layer 52 .

[0084] Optionally, in step S20, providing the first supporting layer 51 and the second supporting layer 52 includes: etching the supporting layer 50 to remove the area of ​​the supporting layer 50 corresponding to the to-be-bent portion 80, so as to form the first supporting layer 51 in the area of ​​the supporting layer 50 corresponding to the display portion 10, and forming the second supporting layer 52 in the area of ​​the supporting layer 50 corresponding to the bonding portion 30. Specifically, referring to Figure 8 After etching the support layer 50 , a groove area 40 is formed. The purpose of the groove is to remove the area on the harder support layer 50 corresponding to the portion to be bent 80 , so as to facilitate the subsequent bending of the portion to be bent 80 .

[0085] Step S30, bend the portion to be bent 80 to form a bending portion 20, so that the display portion 10 and the bonding portion 30 are spaced apart from each other, and the projection of the display portion 10 in the first direction at least partially overlaps with the projection of the bonding portion 30 in the first direction; the first supporting layer 51 and the second supporting layer 52 are located between the display portion 10 and the bonding portion 30, and the projection of the first supporting layer 51 in the first direction at least partially overlaps with the projection of the second supporting layer 52 in the first direction; wherein the projection of the bending portion 20 in the first direction and the projection of the display portion 10 in the first direction have an overlapping area, and the first direction is the thickness direction of the display panel 200 to be bent. Specifically, referring to Figure 7 , is the display panel 100 after being bent.

[0086] The method for preparing a display panel provided in the present embodiment has an overlapping area between the projection of the bending portion 20 in the first direction and the projection of the display portion 10 in the first direction, that is, a part of the bending portion 20 is hidden on the non-display side of the display panel 100. The stress of the bending portion 20 can be reduced under the condition of the same bending radius, thereby reducing the probability of metal wiring breakage and film tearing in the bending portion 20, and ultimately reducing the risk of black spots and bright lines; or, reducing the bending radius under the same stress condition is conducive to achieving a narrower frame.

[0087] Reference Figure 7 As shown, in one embodiment, setting the portion to be bent 80 includes setting a main bending portion 23 and setting an over-pull portion 24 connected to the main bending portion 23. In step S30, the portion to be bent 80 is bent to form the bending portion 20, including:

[0088] The portion to be bent 80 is bent to form the bending portion 20, so that the projection of the main bending portion 23 in the first direction does not overlap with the projection of the display portion 10 in the first direction, and the over-pull portion 24 is over-pull to the bottom of the display portion 10 by over-pull, so that the projection of the over-pull portion 24 in the first direction is located within the projection of the display portion 10 in the first direction. That is, the second supporting layer 52 is contracted relative to the first supporting layer 51 in the X direction. Figure 4-6 As shown, in the direction perpendicular to the display panel 100 (-Y and Y directions in the figure), the left side of the second supporting layer 52 is flush with the left side of the first supporting layer 51, ensuring that the bending portion 20 is a vertically symmetrical structure. In this embodiment, the left side of the second supporting layer 52 and the left side of the first supporting layer 51 are vertically misaligned, so that part of the bending portion 20 is hidden to the non-display side (back side) of the display panel 100, so that the width of the bending portion 20 can be larger under the same bending radius, and the buffer range at the a4 position and the b4 position during the bending process is increased, effectively reducing the stress at the a4 position and the b4 position during the bending process, and can also reduce the bending radius under the same stress conditions, which is conducive to achieving a narrower frame.

[0089] Please continue to refer to Figure 7 As shown, in the display panel 100 after bending in step S30, the bending portion 20 forms a free space 60 with the first supporting layer 51 and the second supporting layer 52, so that the bending portion 20 can bend freely, which is convenient for adjusting the bending radius. At the same time, there is no need to add additional supporting structures, avoiding increasing process complexity and cost.

[0090] Specifically, in the display panel 100 after being bent in step S30, a free space 60 is formed between the inner side of the bend facing the bending portion 20 and the first supporting layer 51 and the second supporting layer 52, so that the bending portion 20 is supported and positioned only by the two ends respectively connected to the first supporting layer 51 and the second supporting layer 52, so as to facilitate the adjustment of the relative positions of the display portion 10 and the bonding portion 30 along the -X and X directions, thereby realizing the adjustment of the bending radius r4.

[0091] Based on the same inventive concept, another embodiment of the present application further discloses a display device, which includes the display panel in the above embodiment. Further, the display device includes a mobile phone, VR equipment, computer, television, car display equipment, etc.

[0092] A display device provided in this embodiment has a display panel 100 in which a projection of a bending portion 20 in a first direction and a projection of a display portion 10 in the first direction have an overlapping area, that is, a partial area of ​​the bending portion 20 is hidden to the non-display side of the display panel 100, which can reduce the stress of the bending portion 20 under the condition of the same bending radius, thereby reducing the probability of metal wiring breakage and film tearing in the bending portion 20, and ultimately reducing the risk of black spots and bright lines; or, reducing the bending radius under the same stress condition is conducive to achieving a narrower frame and improving the performance of the display device.

[0093] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0094] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0095] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: The screen body comprises a display portion, a bending portion and a bonding portion connected in sequence, wherein the display portion and the bonding portion are arranged at intervals from each other, and the bending portion is connected between the display portion and the bonding portion; a projection of the display portion in a first direction and a projection of the bonding portion in the first direction at least partially overlap; wherein the first direction is a thickness direction of the display panel; a first supporting layer and a second supporting layer, wherein the first supporting layer and the second supporting layer are arranged between the display portion and the bonding portion, and the first supporting layer is attached to the display portion, and the second supporting layer is attached to the bonding portion; a projection of the first supporting layer in a first direction and a projection of the second supporting layer in the first direction at least partially overlap; There is an overlapping area between the projection of the bending portion in the first direction and the projection of the display portion in the first direction.

2. The display panel according to claim 1, characterized in that: The bending portion includes a main bending portion and an over-pull portion which are continuously arranged, a projection of the main bending portion in the first direction does not overlap with a projection of the display portion in the first direction, and a projection of the over-pull portion in the first direction is located within a projection of the display portion in the first direction; Preferably, the bending portion comprises a wiring area, wherein a portion of the wiring area is located in the main bending portion and a portion of the wiring area is located in the over-pull portion.

3. The display panel according to claim 2, characterized in that: The thickness of the display panel and the bending radius of the main bending portion satisfy the following relationship: 0.3d≤r4≤0.5d Wherein, d is the thickness of the display panel, and r4 is the bending radius of the main bending portion.

4. The display panel according to claim 2, characterized in that: The projection of the over-pull portion in the first direction is a rectangle; Preferably, the bending radius of the main bending portion is greater than the width of the rectangle; Preferably, the width of the rectangle is 20-200 μm.

5. The display panel according to claim 1, characterized in that: The width of the bending portion is 500-1200 μm.

6. The display panel according to claim 1, characterized in that: The bending portion includes a first end and a second end, the first end is connected to the display portion, and the second end is connected to the bonding portion. The bending portion is freely bent so that the curvature radius of the second end is greater than the curvature radius of the first end.

7. The display panel according to claim 1, characterized in that: The display panel further includes: A bonding layer, partly located between the display portion and the first supporting layer, partly located between the bonding portion and the second supporting layer, and partly located inside the bending portion; Preferably, the first supporting layer and the second supporting layer are formed by etching the same supporting layer.

8. A method for preparing a display panel, characterized in that: include: A display panel to be bent is provided, wherein the display panel to be bent comprises a screen body and a supporting layer which are stacked, wherein a display portion, a portion to be bent and a bonding portion which are sequentially connected are arranged on the screen body; A first supporting layer and a second supporting layer are provided to bend the portion to be bent to form a bent portion, so that the display portion and the bonding portion are spaced apart from each other, and the projection of the display portion in the first direction at least partially overlaps with the projection of the bonding portion in the first direction; the first supporting layer and the second supporting layer are located between the display portion and the bonding portion, and the projection of the first supporting layer in the first direction at least partially overlaps with the projection of the second supporting layer in the first direction; wherein, there is an overlapping area between the projection of the bending portion in the first direction and the projection of the display portion in the first direction, and the first direction is the thickness direction of the display panel to be bent.

9. The method for preparing a display panel according to claim 8, wherein: Setting the portion to be bent includes setting a main bending portion and setting an over-pull portion connected to the main bending portion; The step of bending the portion to be bent to form a bent portion comprises: Bend the portion to be bent to form a bending portion so that the projection of the main bending portion in the first direction does not overlap with the projection of the display portion in the first direction, and over-pull the over-pull portion to below the display portion by an over-pull method so that the projection of the over-pull portion in the first direction is located within the projection of the display portion in the first direction.

10. The method for preparing a display panel according to claim 8, wherein: The provision of the first supporting layer and the second supporting layer includes: etching the supporting layer to remove the area on the supporting layer corresponding to the portion to be bent, so as to form a first supporting layer on the supporting layer in an area corresponding to the display portion, and forming a second supporting layer on the supporting layer in an area corresponding to the bonding portion.

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