Display panel, method for manufacturing display panel, and display device

Abstract

This invention provides a display panel, a method for manufacturing the display panel, and a display device. The display panel includes a substrate, which includes a first surface and a second surface disposed opposite to each other, and a side surface connecting the first surface and the second surface. The first surface is located on one side of the light-emitting surface of the display panel. The first surface includes a first display area, a second display area, and a side trace connection area. The side trace connection area is located on at least one side of the first surface, and the second display area is located between the first display area and the side trace connection area. The second display area includes multiple pixel areas, each pixel area including a first area and a second area. The first area is used to set pixel units, and the first surface of the substrate corresponding to the second area is provided with a hydrophilic coating, a groove, or a sacrificial layer. The display panel provided by this invention solves the problem of easy damage to the substrate surface during peeling off residual adhesive, leading to low yield of side traces, by providing a hydrophilic coating, a groove, or a sacrificial layer at the interface between the side trace and the first surface of the substrate.

Description

[Technical Field]

[0001] This invention relates to the field of display technology, and in particular to a display panel, a method for manufacturing the display panel, and a display device. [Background Technology]

[0002] Ultra-narrow bezel displays are a crucial technology for the large-scale development of Micro LEDs. This technology requires side wiring on the display panel, transferring non-display areas such as fan-out and bonding leads from the traditional front to the back. The display area wiring on the front and the bonding wiring on the back are then connected by U-shaped lines crossing the glass side. However, the side wiring stripping process in related technologies, while ensuring no corrosion of the wiring, struggles to address the issue of residual adhesive and can damage the substrate surface to some extent, posing a risk of short circuits and resulting in low yield rates for side wiring. [Summary of the Invention]

[0003] In view of this, embodiments of the present invention provide a display panel, a method for manufacturing the display panel, and a display device to solve the problem of damage to the substrate surface during the removal of residual adhesive, resulting in low yield of side traces.

[0004] In a first aspect, embodiments of the present invention provide a display panel, comprising:

[0005] The substrate includes a first surface and a second surface disposed opposite to each other, and a side surface connecting the first surface and the second surface, wherein the first surface is located on one side of the light-emitting surface of the display panel.

[0006] The first surface includes a first display area, a second display area, and a side wiring connection area, wherein the side wiring connection area is located on at least one side of the first surface, and the second display area is located between the first display area and the side wiring connection area.

[0007] The substrate also includes multiple side traces, which are bent along the side. One end of each side trace is located in the side trace connection area, and the other end of each side trace is located on the second surface.

[0008] The second display area includes multiple pixel areas, each pixel area including a first area and a second area. The first area is used to set pixel units, and the first surface of the substrate corresponding to the second area is provided with a hydrophilic coating, or the first surface of the substrate corresponding to the second area is provided with a groove.

[0009] Secondly, embodiments of the present invention provide a method for manufacturing a display panel, comprising:

[0010] A substrate is provided, the substrate includes a first surface and a second surface disposed opposite to each other, and a side surface connecting the first surface and the second surface, the first surface being located on one side of the light-emitting surface of the display panel;

[0011] The first surface includes a first display area, a second display area, and a side wiring connection area, wherein the side wiring connection area is located on at least one side of the first surface, and the second display area is located between the first display area and the side wiring connection area.

[0012] The second display area includes multiple pixel areas, which include a first area and a second area. The first area is used to set pixel units.

[0013] A sacrificial layer is prepared on the first surface of the substrate corresponding to the second region;

[0014] A photoresist layer is prepared, and the preset positions of the photoresist layer are exposed to form a side-line hollow pattern in the photoresist layer.

[0015] The photoresist layer is attached to the second display area and side wiring connection area of ​​the first surface, as well as the side surface and part of the second surface;

[0016] A metal layer is deposited at the location of the side trace cutout pattern and on the photoresist layer;

[0017] Remove the photoresist layer, sacrificial layer, and portion of the metal layer located on the photoresist to form a side trace on the metal layer.

[0018] Thirdly, embodiments of the present invention provide a display device, including a display panel as described in the first aspect, or a display panel made by the method for preparing the display panel described in the second aspect.

[0019] The display panel, display panel fabrication method, and display device provided in this invention reduce the adhesion between the adhesive layer and the first surface of the substrate by providing a hydrophilic coating, groove, or sacrificial layer at the interface between the side traces and the first surface of the substrate. This makes the adhesive layer easier to peel off, solving the problem of easy damage to the substrate surface during adhesive removal, which leads to low yield of side traces. Furthermore, the hydrophilic coating, groove, or sacrificial layer is located in the second region of the pixel area, which can be adjusted according to the pixel pitch of the substrate, meeting the design requirements of the panel. [Attached Image Description]

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention;

[0022] Figure 2This is a schematic diagram of the structure of a first surface provided in an embodiment of the present invention;

[0023] Figures 3(a)-(c) are Figure 2 Three cross-sectional views along the a-a' direction;

[0024] Figure 4 yes Figure 2 A magnified view of the Q region in the diagram;

[0025] Figure 5 This is a schematic diagram of the structure of another first surface provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of another first surface provided in an embodiment of the present invention;

[0027] Figure 7 yes Figure 6 A cross-sectional view along the b-b' direction;

[0028] Figure 8 yes Figure 6 Another cross-sectional view along the b-b' direction;

[0029] Figure 9 This invention provides a method for manufacturing a display panel.

[0030] Figure 10 This is a schematic diagram of the substrate structure provided in an embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the structure of another first surface provided in an embodiment of the present invention;

[0032] Figures 12(a)-(c) are Figure 11 Three cross-sectional views along the c-c' direction;

[0033] Figure 13 This is a schematic diagram of the photoresist peeling process where the sacrificial layer is a UV anti-adhesion film;

[0034] Figure 14 This is a schematic diagram of the photoresist stripping process where the sacrificial layer is a pyrolytic anti-adhesion film;

[0035] Figure 15 This is a schematic diagram of the stripping process for photoresist with a sacrificial layer of titanium-tungsten alloy.

[0036] Figure 16 This is a schematic diagram of the structure of a display device provided by the present invention.

Detailed Implementation Methods

[0037] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0040] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0041] It should be understood that although the terms "first," "second," etc., may be used to describe the display areas in the embodiments of the present invention, these display areas should not be limited to these terms. These terms are only used to distinguish the display areas from each other. For example, without departing from the scope of the embodiments of the present invention, the first display area may also be referred to as the second display area, and similarly, the second display area may also be referred to as the first display area.

[0042] In the photoresist stripping step of the side wiring process, it is difficult to remove the photoresist layer while ensuring that the stripper does not corrode the traces. Especially at the interface between the side traces and the front side of the substrate, the photoresist layer is difficult to remove and is prone to leaving residue. If the residue is removed forcefully, it can easily damage the substrate surface, causing short circuits in the substrate circuits and resulting in low yield of the side wiring.

[0043] In view of this, the present invention provides a display panel, a method for manufacturing a display panel, and a display device to solve the problem of damage to the substrate surface during the removal of residual adhesive, resulting in low yield of side traces. Specific embodiments of the display panel, the method for manufacturing a display panel, and the display device will be described in detail below.

[0044] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a first surface provided in an embodiment of the present invention, such as... Figure 1 and Figure 2As shown, the display panel 100 includes a substrate 10, which includes a first surface 11 and a second surface 12 disposed opposite to each other, and a side surface 13 connecting the first surface 11 and the second surface 12. The first surface 11 is located on one side of the light-emitting surface of the display panel 100. The first surface 11 includes a first display area 111, a second display area 112, and a side trace connection area 113. The side trace connection area 113 is located on at least one side of the first surface 11, and the second display area 112 is located between the first display area 111 and the side trace connection area 113. The substrate 10 also includes a plurality of side traces 14, which extend along a first direction (i.e., the Y direction) and are arranged along a second direction (i.e., the X direction). The plurality of side traces 14 are bent along the side surface 13, with one end of the side trace 14 located in the side trace connection area 113 and the other end of the side trace 14 located on the second surface 12. The second display area 112 includes multiple pixel areas 20. Each pixel area 20 includes a first area 21 and a second area 22. The first area 21 is used to set pixel units, and the second area 22 is disposed on the planarization layer of the substrate. A metal electrode is provided below the substrate corresponding to the second area 22. The multiple pixel areas 20 and the second area 22 are arranged along a second direction (i.e., the X direction), and the second area 22 is located between the first area 21 and the side trace connection area 113. The first surface of the substrate corresponding to the second area 22 is provided with a hydrophilic coating, or the first surface of the substrate corresponding to the second area 22 is provided with a groove.

[0045] Understandable, Figure 1 The substrate is a cuboid with four sides, of which side traces are provided on two sides. Correspondingly, Figure 2 The first surface shown has a side trace connection area on each side along the Y direction. Depending on actual design requirements, side traces can also be provided on one or more sides of the substrate, correspondingly providing one or more side trace connection areas on the first surface. This invention does not limit this. The shape and size of the hydrophilic coating or groove at different locations in the second display area can be the same or different. For example, the shape and size of the hydrophilic coating or groove at the left and right ends of the second display area can be the same or different from the shape and size of the hydrophilic coating or groove in the middle area of ​​the second display area.

[0046] Figures 3(a)-(c) are Figure 2 Figure 3(a) shows three cross-sectional views along the a-a' direction. A hydrophilic coating 31 (a patterned hydrophilic coating is shown in the figure) is provided on the first surface 11 of the substrate 10 corresponding to the second region. The thickness h1 of the hydrophilic coating is less than or equal to 5 micrometers. In the side wiring fabrication process, when the photoresist layer (not shown in the figure) covers the second display area, that is, the surface of the hydrophilic coating is covered with the photoresist layer, since the photoresist is mainly hydrophobic, when the photoresist layer comes into contact with the hydrophilic coating, the adhesion can be reduced, and the photoresist layer can be more easily removed with a resist remover.

[0047] As shown in FIGS. 3(b) and 3(c), a groove 32 is provided on the first surface 11 of the substrate 10 corresponding to the second region. The cross-section of the groove can be a rectangle as shown in FIG. 3(b) or a semi-circle as shown in FIG. 3(c), and can also be any shape such as an inverted cone or a square. It should be noted that the thickness h2 of the groove 32 is less than or equal to 5 micrometers. For the convenience of illustration in FIGS. 3(b) and 3(c), the shape of the groove is enlarged. In fact, the volume of the groove in the overall substrate is very small. In the preparation process of the side wiring, when the photoresist layer (not shown in the figure) covers the second display region, due to the very small volume of the groove, the glue layer will not fill the groove without applying strong pressure. Therefore, the direct contact area between the glue layer and the substrate can be reduced, the adhesion force can be lowered, and the glue layer can be more easily removed.

[0048] In the embodiment of the present invention, by providing a hydrophilic coating or a groove in the junction region (i.e., the second display region) between the side wiring and the first surface of the substrate, the adhesion force between the glue layer and the first surface of the substrate is reduced, so that the glue layer is easier to peel off, solving the problem that the surface of the substrate is easily damaged when peeling off the residual glue, resulting in a low yield of the side wiring. Moreover, the position where the hydrophilic coating or the groove is provided is in the second region of the pixel region of the second display region, and can be adjusted according to the pixel pitch of the substrate, meeting the design requirements of the panel.

[0049] In one optional embodiment, hydrophilic coatings are provided in the regions corresponding to the second region 22 on the first surface 11 and the second surface 12 respectively, or grooves are provided in the regions corresponding to the second region 22 on the first surface 11 and the second surface 12 respectively. In this embodiment, by providing hydrophilic coatings or grooves on both the first surface and the second surface, the glue layer can be more easily peeled off and residual glue is not easily generated. Optionally, the shapes and sizes of the second region on the first surface and the second region on the second surface can be the same or different, and this is not limited thereto.

[0050] Figure 4 is Figure 2 a partial enlarged schematic diagram of the Q region in, as Figure 4 shown. Considering the size of the pixel design and the design requirements of the panel, in the X direction, the spacing between adjacent second regions 22 is D1, the spacing between adjacent side wirings 14 is D2, and the spacing between adjacent pixel regions 20 is D3, and D2 < D3 < D1. When designing the panel, the number of side wirings is large, the spacing between adjacent side wirings is small, and the second region corresponding to the hydrophilic coating or the groove is provided in the pixel region. Therefore, the spacing between adjacent second regions 22 is greater than the spacing between adjacent pixel regions 20.

[0051] Optionally, the width of the second region 22 in the X direction is W1, the width of the side trace 14 is W2, and the width of the pixel region 20 in the X direction is W3, where W2 < W1 < W3. In the X direction, signal lines (such as gate lines, data lines, etc.) are provided between adjacent pixel regions 20. In order to reduce the influence of the hydrophilic coating or the groove on the signal lines, the projection of the second region 22 on the substrate does not overlap with the signal lines. The width of the pixel region in the X direction is greater than the width of the second region 22 in the X direction, and the number of side traces is large and the designed width is small. Therefore, the width of the side trace is the smallest.

[0052] In one optional embodiment, a hydrophilic coating is provided on the first surface of the substrate corresponding to the second region. In the arrangement direction of the side traces, the second display region includes two end regions and a middle region, and the thickness of the hydrophilic coating in the two end regions is greater than the thickness of the hydrophilic coating in the middle region; or the projected area of the hydrophilic coating on the substrate in the two end regions is greater than the projected area of the hydrophilic coating on the substrate in the middle region.

[0053] Figure 5 and Figure 6 are schematic diagrams of another structure of the first surface provided by the embodiments of the present invention. As shown in Figure 5 and Figure 6 shown, the first surface 11 includes a first display region 111, a second display region 112, and a side trace connection region 113. The second display region 112 includes a plurality of pixel regions 20 (not shown in the figure). Each pixel region 20 includes a first region 21 (not shown in the figure) and a second region 22. A hydrophilic coating is provided on the first surface of the substrate corresponding to the second region 22, or a groove is provided on the first surface of the substrate corresponding to the second region 22. In the arrangement direction of the side traces (i.e., the X direction), the second display region 112 includes two end regions and a middle region. Exemplarily, Figure 5 the two end regions of the second display region 112 shown include region B1 and region B2, which are respectively located at the left and right ends of the substrate 11, and each of region B1 and region B2 includes 2 second regions 22. The other regions of the second display region 112 excluding the two end regions are the middle region.

[0054] It can be understood that the two end regions may include one or more second regions at both ends of the substrate, and the number of second regions included at each end may be the same or different. The middle region may be the other regions of the second display region excluding the two end regions, or may be the region near the center of the second display region.

[0055] In Figure 5In the illustrated embodiment, the projected area of ​​the hydrophilic coating or groove (i.e., the second region) in the end regions B1 and B2 on the substrate is greater than the projected area of ​​the hydrophilic coating or groove (i.e., the second region) in the middle region on the substrate. In this embodiment, since the adhesive layer on the side traces in the left and right end regions of the substrate is more difficult to remove than that in the middle region, setting the projected area of ​​the hydrophilic coating in the left and right end regions on the substrate to be greater than that in the middle region increases the contact area between the adhesive layer and the hydrophilic coating, enhances the anti-adhesion effect of the hydrophilic coating in the left and right end regions, and improves the removal of the adhesive layer in the left and right end regions. Alternatively, setting the projected area of ​​the groove in the left and right end regions on the substrate to be greater than that in the middle region reduces the contact area between the adhesive layer and the substrate, enhances the anti-adhesion effect of the groove in the left and right end regions, and improves the removal of the adhesive layer in the left and right end regions.

[0056] See also Figure 6 , Figure 7 and Figure 8 , Figure 7 yes Figure 6 A cross-sectional view along the b-b' direction. Figure 8 yes Figure 6 Another cross-sectional view along the b-b' direction, in Figure 6 In the illustrated embodiment, the projected area of ​​the hydrophilic coating or groove (i.e., the second region) in the end regions B1 and B2 on the substrate is equal to the projected area of ​​the hydrophilic coating or groove (i.e., the second region) in the middle region on the substrate, and the thickness of the hydrophilic coating in the end regions is greater than the thickness of the hydrophilic coating in the middle region (see [reference]). Figure 7 ), or the depth of the grooves in the two end regions is greater than the depth of the groove in the middle region (see Figure 8 In this embodiment, since the adhesive layer on the side traces is more difficult to remove from the left and right end areas of the substrate than from the middle area, the depth of the grooves in the end areas is greater than the depth of the grooves in the middle area, or the thickness of the hydrophilic coating in the end areas is greater than the thickness of the hydrophilic coating in the middle area. This increases the distance between the adhesive layer and the substrate, enhances the anti-adhesion effect of the hydrophilic coating or grooves in the left and right end areas, and facilitates better removal of the adhesive layer in the left and right end areas. Optionally, Figure 6 The projected area of ​​the hydrophilic coating or groove (i.e., the second region) in the two end regions B1 and B2 on the substrate may not be equal to the projected area of ​​the hydrophilic coating or groove (i.e., the second region) in the middle region on the substrate. For example, the projected area of ​​the second region in the two end regions may be greater than the projected area of ​​the second region in the middle region, as long as the depth of the groove in the two end regions is greater than the depth of the groove in the middle region, or the thickness of the hydrophilic coating in the two end regions is greater than the thickness of the hydrophilic coating in the middle region.

[0057] like Figure 9As shown in the figure, this embodiment of the invention also provides a method for manufacturing a display panel, the specific steps of which are as follows:

[0058] Step S91: Provide a substrate.

[0059] See Figure 10 and Figure 11 The substrate 10 includes a first surface 11 and a second surface 12 disposed opposite to each other, and a side surface 13 connecting the first surface 11 and the second surface 12. The first surface 11 is located on one side of the light-emitting surface of the display panel. Optionally, the first surface 11 and the second surface 12 of the substrate are provided with a PI film (polyimide film) with a thickness of 30 to 100 μm, preferably 50 μm, for protecting the substrate.

[0060] The first surface 11 includes a first display area 111, a second display area 112, and a side trace connection area 113. The side trace connection area 113 is located on at least one side of the first surface 11, and the second display area 112 is located between the first display area 111 and the side trace connection area 113. The second display area 112 includes a plurality of pixel areas 20. The pixel areas 20 include a first area 21 and a second area 22. The first area 21 is used to set pixel units. The second area 22 is disposed on the planarization layer of the substrate, and a metal electrode is provided under the substrate corresponding to the second area 22.

[0061] Step S92: Prepare a sacrificial layer on the first surface of the substrate corresponding to the second region.

[0062] A sacrificial layer 33 is prepared on the first surface corresponding to the second region 22. Figure 11 The sacrificial layer 33 shown is a patterned structure and a block structure. The specific shape can be a rectangle, a circle, etc.

[0063] Optionally, the sacrificial layer is made of a UV anti-adhesion film, a pyrolytic anti-adhesion film, or a titanium-tungsten alloy.

[0064] In some alternative embodiments, a sacrificial layer may also be prepared on the second surface 12 in the region corresponding to the second region 22. In this embodiment, by providing sacrificial layers on both the first and second surfaces, the adhesive layer can be more easily peeled off and less likely to leave residue. Optionally, the shape and size of the second regions on the first and second surfaces may be the same or different, and are not limited thereto.

[0065] Step S93: Prepare a photoresist layer and expose the preset position of the photoresist layer to form a side-line hollow pattern.

[0066] Specifically, a photoresist layer is first coated onto PET, and then the photoresist layer is exposed at predetermined positions using photolithography or other methods to form a side-line cutout pattern. PET is a transparent plastic film made of polyethylene terephthalate with a thickness of approximately 20 μm to 120 μm, preferably 70 μm; the photoresist layer is a negative photoresist with a thickness of 10 to 50 μm, preferably 25 μm, and is prepared by spin coating or direct coating.

[0067] Optionally, in the manufacturing process of the display panel, a sacrificial layer can be prepared on the first surface of the substrate corresponding to the second region, or a sacrificial layer can be set at the edge of the photoresist layer by alignment technology, and the sacrificial layer is attached to the second region of the first surface by the following step S94.

[0068] Step S94: The photoresist layer is attached to the substrate.

[0069] Specifically, the PET film coated with a photoresist layer can be bent so that the photoresist layer is attached to the second display area and side wiring connection area of ​​the first surface, as well as the side surface and part of the second surface.

[0070] See Figures 12(a)-(c), Figures 12(a)-(c) are Figure 11 Three cross-sectional views along the c-c' direction.

[0071] As an optional embodiment, as shown in FIG12(a), a sacrificial layer 33 is disposed on the first surface 11 of the substrate 10, and a photoresist layer 30 is attached to the first and second surfaces of the substrate. The thickness of the sacrificial layer is H1, and the thickness of the photoresist layer is H2, where H1:H2 ≤ 1:10. The thickness of the sacrificial layer should not be too thick, so that the overall thickness difference between the photoresist layer and the sacrificial layer is small. Optionally, H1 = 1 μm, H2 = 20 μm.

[0072] It should be noted that the thickness of the photoresist layer in Figures 12(a)-(c) where the sacrificial layer is provided is the same as the thickness of the photoresist layer where the sacrificial layer is not provided, and it is a fixed thickness. Since the thickness of the sacrificial layer is relatively thin, for the sake of illustration, the influence of the thickness of the sacrificial layer on the overall thickness is ignored in the figure. However, it can be understood that the overall thickness with the sacrificial layer is greater than the overall thickness without the sacrificial layer.

[0073] As an optional embodiment, as shown in FIG12(b), a sacrificial layer 33 is provided on both the first surface 11 and the second surface 12 of the substrate. By providing a sacrificial layer on both the first and second surfaces, the adhesive layer can be more easily peeled off and less likely to produce adhesive residue.

[0074] As an optional embodiment, as shown in Figure 12(c), in the extension direction of the side trace (i.e., the Y direction), the minimum distance between the edge of the sacrificial layer 33 and the edge of the photoresist layer 30 is D4, where D4 ≤ 200 μm. That is, the sacrificial layer is located at the edge of the photoresist layer, and the edges of the sacrificial layer and the photoresist layer may or may not overlap, with a minimum distance between their edges less than or equal to 200 μm. The closer the sacrificial layer is to the edge of the photoresist layer, the easier it is for the photoresist edge to be peeled off, and the less likely it is to generate residual photoresist.

[0075] Step S95: Deposit a metal layer at the location of the side trace cutout pattern and on the photoresist layer.

[0076] Specifically, a metal layer is deposited at the location of the side trace cutout pattern and on the photoresist layer. This metal can be Cu, Au, or other metals, but is not limited to these.

[0077] Step S96: Remove the photoresist layer, sacrificial layer, and portion of the metal layer located on the photoresist, so that the metal layer forms a side trace.

[0078] After removing the photoresist, sacrificial layer, and metal layer on the photoresist, the remaining metal layer (the metal layer at the location of the side trace cutout pattern) can form the side trace.

[0079] Specifically, if the sacrificial layer is made of UV anti-adhesion film 331, the flowchart of the photoresist stripping process is as follows: Figure 13 As shown, the specific steps are as follows:

[0080] ① A blue film 35 is attached to the surface of the metal layer 34;

[0081] ② The metal layer 34 on the surface of the photoresist layer 30 is removed using the blue film 35 peeling film. The blue film is made of adhesive polyethylene with a thickness of 30μm to 100μm. The metal layer is removed first because the photoresist layer needs to be transparent.

[0082] ③Tear off the PI film 36;

[0083] ④ UV light irradiation of UV anti-adhesion film 331 reduces the stickiness of the UV anti-adhesion film, making it easier to remove;

[0084] ⑤ The photoresist layer 30 is removed in a wet process using a non-corrosive photoresist remover solution. The removal time is 3–20 minutes, preferably 8 minutes. The remaining metal layer can then be used to form the side traces.

[0085] If the sacrificial layer is made of a thermally desiccant film 332 (which can be an acrylic adhesive that can be automatically peeled off upon heating), the flowchart of the photoresist peeling process is as follows: Figure 14 As shown, the specific steps are as follows:

[0086] ①Tear off the PI film 36;

[0087] ② Heating reduces the viscosity of the pyrolysis anti-adhesion film 332. The heating temperature is 130-200℃, preferably 140℃.

[0088] ③ The photoresist layer 30 is removed in a wet process using a non-corrosive stripper solution. The stripper time is 3 to 20 minutes, preferably 8 minutes. The metal layer 34 on the surface of the photoresist layer 30 is peeled off together with the photoresist layer, and the remaining metal layer can form the side trace.

[0089] If the sacrificial layer is made of titanium-tungsten alloy 333, the flowchart of the photoresist stripping process is as follows: Figure 15 As shown, the specific steps are as follows:

[0090] ①Tear off the PI film 36;

[0091] ②The titanium-tungsten alloy 333 was removed by wet treatment with H2O2 and other methods;

[0092] ③ The photoresist layer 30 is removed in a wet process using a non-corrosive stripper solution. The stripper time is 3 to 20 minutes, preferably 8 minutes. The metal layer 34 on the surface of the photoresist layer 30 is peeled off together with the photoresist layer, and the remaining metal layer can form the side trace.

[0093] If the sacrificial layer is made of titanium-tungsten alloy 333, the projection of the second region of the sacrificial layer onto the plane of the substrate does not overlap with the first region, and it does not overlap with the metal traces between pixel areas, thus avoiding short circuits due to the conductivity of titanium-tungsten alloy.

[0094] The display panel fabrication method provided in this invention provides a sacrificial layer at the interface between the side traces and the first surface of the substrate. When peeling off the adhesive layer, the sacrificial layer is removed first, followed by complete removal of the adhesive layer. This reduces the adhesion between the adhesive layer and the first surface of the substrate, making the adhesive layer easier to peel off. This solves the problem of damaging the substrate surface during adhesive removal, leading to low yield of the side traces. Furthermore, the sacrificial layer is positioned in the second region of the pixel area, which can be adjusted according to the pixel pitch of the substrate, meeting the design requirements of the panel.

[0095] Optionally, the layout of the second region where the sacrificial layer is provided can refer to the layout of the second region where the hydrophilic coating or groove is provided in the above embodiments. See details... Figure 4, a plurality of side traces 14 extend along the first direction (Y direction) and are arranged along the second direction (X direction); a plurality of pixel regions 20 and the second region 22 are arranged along the second direction; in the second direction, the pitch between adjacent second regions 22 is D1, the pitch between adjacent side traces 14 is D2, and the pitch between adjacent pixel regions 20 is D3, where D2 < D3 < D1. The width of the second region 22 in the second direction is W1, the width of the side trace 14 is W2, and the width of the pixel region 20 in the second direction is W3, where W2 < W1 < W3. For the specific technical principles and technical effects, reference can be made to the above description and will not be elaborated here.

[0096] Optionally, in the arrangement direction of the side traces, the second display region includes two end regions and a middle region, and the thickness of the sacrificial layer in the two end regions is greater than or equal to the thickness of the sacrificial layer in the middle region; or the projected area of the sacrificial layer on the substrate in the two end regions is greater than or equal to the projected area of the sacrificial layer on the substrate in the middle region. For the specific technical principles and technical effects, reference can be made to the above description and will not be elaborated here.

[0097] An embodiment of the present invention also provides a display device, as Figure 16 shown, Figure 16 is a schematic structural diagram of the display device provided by the embodiment of the present invention. The display device includes the above-mentioned display panel 100. The shape of the display panel can be circular or elliptical, and it is also applicable to a display panel with a curved lower border. The present invention does not limit the shape of the display panel. Moreover, the present invention does not limit the type of the display panel 100. The display panel 100 can be a liquid crystal display panel, an OLED display panel, or a micro LED display panel. Among them, the specific structure included in the display panel 100 has been described in detail in the above embodiments and will not be elaborated here.

[0098] For the display device provided by the embodiment of the present invention, by providing a hydrophilic coating, a groove, or a sacrificial layer in the junction region between the side trace and the first surface of the substrate, the adhesion force between the adhesive layer and the first surface of the substrate is reduced, making the adhesive layer easier to peel off, and solving the problem that the surface of the substrate is easily damaged when peeling off the residual glue, resulting in a low yield of the side trace. Moreover, the position where the hydrophilic coating, the groove, or the sacrificial layer is provided is in the second region of the pixel region, and it can be adjusted according to the pixel pitch of the substrate, meeting the design requirements of the panel.

[0099] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, include: The substrate includes a first surface and a second surface disposed opposite to each other, and a side surface connecting the first surface and the second surface, wherein the first surface is located on one side of the light-emitting surface of the display panel; The first surface includes a first display area, a second display area, and a side wiring connection area, wherein the side wiring connection area is located on at least one side of the first surface, and the second display area is located between the first display area and the side wiring connection area; The substrate also includes a plurality of side traces, which are bent along the side surface. One end of each side trace is located in the side trace connection area, and the other end of each side trace is located on the second surface. The second display area includes multiple pixel areas, each pixel area including a first area and a second area. The first area is used to set pixel units, and the first surface of the substrate corresponding to the second area is provided with a hydrophilic coating. In the arrangement direction of the side traces, the second display area includes two end areas and a middle area, wherein the thickness of the hydrophilic coating in the two end areas is greater than the thickness of the hydrophilic coating in the middle area; or the projected area of ​​the hydrophilic coating in the two end areas on the substrate is greater than the projected area of ​​the hydrophilic coating in the middle area on the substrate.

2. The display panel according to claim 1, characterized in that, A hydrophilic coating is provided on the second surface in the area corresponding to the second region, or a groove is provided on the second surface in the area corresponding to the second region.

3. The display panel according to claim 1 or 2, characterized in that, The multiple side routing lines extend along a first direction and are arranged along a second direction; The plurality of pixel regions and the second region are arranged along the second direction; In the second direction, the spacing between adjacent second regions is D1, the spacing between adjacent side traces is D2, and the spacing between adjacent pixel regions is D3. <D3<D1。 4. The display panel according to claim 3, characterized in that, The width of the second region in the second direction is W1, the width of the side trace is W2, and the width of the pixel region in the second direction is W3. <W1<W3。 5. The display panel according to claim 1, characterized in that, The first surface of the substrate corresponding to the second region is provided with a groove. In the arrangement direction of the side traces, the second display area includes two end regions and a middle region. The depth of the groove in the two end regions is greater than the depth of the groove in the middle region; or the projected area of ​​the groove in the two end regions on the substrate is greater than the projected area of ​​the groove in the middle region on the substrate.

6. A method for manufacturing a display panel as described in any one of claims 1-5, characterized in that, include: A substrate is provided, the substrate including a first surface and a second surface disposed opposite to each other, and a side surface connecting the first surface and the second surface, wherein the first surface is located on one side of the light-emitting surface of the display panel; The first surface includes a first display area, a second display area, and a side wiring connection area, wherein the side wiring connection area is located on at least one side of the first surface, and the second display area is located between the first display area and the side wiring connection area; The second display area includes multiple pixel areas, including a first area and a second area, wherein the first area is used to set pixel units; A sacrificial layer is prepared on the first surface of the substrate corresponding to the second region; A photoresist layer is prepared, and the photoresist layer is exposed at a preset position to form a side-line cutout pattern. The photoresist layer is attached to the second display area and side trace connection area of ​​the first surface, as well as the side surface and part of the second surface; A metal layer is deposited at the location of the side trace cutout pattern and on the photoresist layer; Remove the portion of the photoresist layer, the sacrificial layer, and the metal layer located on the photoresist layer, so that the metal layer forms a side trace; In the arrangement direction of the side traces, the second display area includes two end areas and a middle area, wherein the thickness of the sacrificial layer in the two end areas is greater than the thickness of the sacrificial layer in the middle area; or the projected area of ​​the sacrificial layer in the two end areas on the substrate is greater than the projected area of ​​the sacrificial layer in the middle area on the substrate.

7. The method for manufacturing a display panel according to claim 6, characterized in that, Prior to the preparation of the photoresist layer, the method further includes, The sacrificial layer is prepared on the second surface in the region corresponding to the second region.

8. The method for manufacturing a display panel according to claim 6, characterized in that, The side routing extends along a first direction and is arranged along a second direction; The plurality of pixel regions and the second region are arranged along the second direction; In the second direction, the spacing between adjacent second regions is D1, the spacing between adjacent side traces is D2, and the spacing between adjacent pixel regions is D3. <D3<D1。 9. The method for manufacturing a display panel according to claim 8, characterized in that, The width of the second region in the second direction is W1, the width of the side trace is W2, and the width of the pixel region in the second direction is W3. <W1<W3。 10. The method for manufacturing a display panel according to claim 6, characterized in that, In the extension direction of the side trace, the minimum distance between the edge of the sacrificial layer and the edge of the photoresist layer is less than or equal to 200 μm.

11. The method for manufacturing a display panel according to claim 6, characterized in that, The thickness of the sacrificial layer is H1, and the thickness of the photoresist layer is H2, where H1:H2≤1:

10.

12. The method for manufacturing a display panel according to any one of claims 6-11, characterized in that, The sacrificial layer is made of UV anti-adhesion film, pyrolytic anti-adhesion film, or titanium-tungsten alloy.

13. A display device, characterized in that, It includes the display panel as described in any one of claims 1-5, or the display panel made by the method of making the display panel as described in any one of claims 6-12.

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