Touch screen, display device and method for manufacturing touch screen

Abstract

The embodiments of the present application provide a touch screen, a display device, and a method for preparing the touch screen, which are used to solve the problem of inorganic film layer falling off on the surface of the display panel in the touch screen. The touch screen includes a display area and a peripheral area located outside the display area; the display panel includes at least one retaining wall, and the retaining wall is located in the peripheral area; the touch panel is arranged on the light-emitting side of the display panel, and the touch panel includes a first metal layer and a second metal layer, and the second metal layer is arranged on the side of the first metal layer away from the display panel; the first metal layer includes a touch auxiliary pattern and a first auxiliary pattern, the touch auxiliary pattern is located in the display area, the first auxiliary pattern is located in the peripheral area, and the orthographic projection of the first auxiliary pattern on the display panel overlaps with the orthographic projection of the retaining wall on the display panel; the first auxiliary pattern is a solid pattern; the second metal layer includes a touch pattern, and the touch pattern is located in the display area.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a touch screen, a display device and a method for manufacturing the touch screen. Background Art

[0002] With the development of display technology, display devices with touch screens are becoming more and more popular because of their simple and convenient operation and better user experience. A touch screen includes a display panel and a touch sensor panel (TSP for short). The touch panel is arranged on the light-emitting side of the display panel to facilitate touch operation. The touch panel can be manufactured by a flexible multi-layer on cell (FMLOC) process. Usually, the touch panel includes a plurality of film layer structures.

[0003] However, when some film layers in the touch panel are made through the FMLOC process, water-containing processes such as water washing, gluing and developing are required. The external force of water impact in the water process can easily cause cracks in the inorganic film layer on the surface of the display panel, causing water vapor to enter the display panel along the cracks, causing the inorganic film layer on the surface of the display panel to fall off. Summary of the invention

[0004] Embodiments of the present invention provide a touch screen, a display device and a method for manufacturing the touch screen, which are used to solve the problem of inorganic film layer falling off on the surface of the display panel in the touch screen.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] On the one hand, a touch screen is provided, which includes a display area and a peripheral area located outside the display area; a display panel includes at least one retaining wall, and the retaining wall is located in the peripheral area; a touch panel is arranged on the light-emitting side of the display panel, and the touch panel includes a first metal layer and a second metal layer, and the second metal layer is arranged on the side of the first metal layer away from the display panel; the first metal layer includes a touch auxiliary pattern and a first auxiliary pattern, the touch auxiliary pattern is located in the display area, the first auxiliary pattern is located in the peripheral area, and the orthographic projection of the first auxiliary pattern on the display panel overlaps with the orthographic projection of the retaining wall on the display panel; the first auxiliary pattern is a solid pattern; the second metal layer includes a touch pattern, and the touch pattern is located in the display area.

[0007] Optionally, the first auxiliary pattern is correspondingly arranged on a side of each retaining wall close to the touch panel.

[0008] Optionally, the first auxiliary pattern at least covers a side surface of the retaining wall.

[0009] Optionally, a plurality of the first auxiliary patterns corresponding to a plurality of the retaining walls are connected to each other.

[0010] Optionally, the touch screen includes a reference ground signal terminal, and the first auxiliary pattern is coupled to the reference ground signal terminal;

[0011] Optionally, the touch screen includes an integrated circuit, and the first auxiliary pattern is coupled to the integrated circuit.

[0012] Optionally, the display panel also includes a flat layer and a pixel defining layer arranged on the side of the flat layer facing the touch panel; the flat layer has a first hollow pattern, and the pixel defining layer has a second hollow pattern; the first hollow pattern and the second hollow pattern are located on the side of the retaining wall away from the display area; the first metal layer also includes a second auxiliary pattern, and the orthographic projection of the second auxiliary pattern on the display panel overlaps with the orthographic projection of the second hollow pattern on the display panel.

[0013] Optionally, the second auxiliary pattern covers the second hollow pattern and overlaps with the pixel defining layer.

[0014] Optionally, the flat layer also has a third hollow pattern, and the pixel defining layer has a fourth hollow pattern; the third hollow pattern and the fourth hollow pattern are located on a side of the first hollow pattern close to the display area; the first metal layer also includes a third auxiliary pattern, and the orthographic projection of the third auxiliary pattern on the display panel overlaps with the orthographic projection of the fourth hollow pattern on the display panel.

[0015] Optionally, the third auxiliary pattern covers the fourth hollow pattern and overlaps with the pixel defining layer.

[0016] Optionally, the display panel also includes a flat layer and a pin group; the flat layer has a fifth hollow pattern, and the pin group is located within the outline of the fifth hollow pattern and on the backlight side of the display panel; the first metal layer also includes a fourth auxiliary pattern, and the orthographic projection of the fourth auxiliary pattern on the display panel overlaps with the orthographic projection of the fifth hollow pattern on the display panel, and does not overlap with the orthographic projection of the pin group on the display panel.

[0017] Optionally, the fourth auxiliary pattern overlaps with the planar layer.

[0018] Optionally, the distance from the edge of the first auxiliary pattern to the edge of the retaining wall is greater than 5 microns.

[0019] Optionally, a distance from an edge of the second auxiliary pattern to an edge of the second hollow pattern is greater than 5 micrometers.

[0020] Optionally, a distance from an edge of the third auxiliary pattern to an edge of the fourth hollow pattern is greater than 5 micrometers.

[0021] Optionally, a distance from an edge of the fourth auxiliary pattern to an edge of the fifth hollow pattern is greater than 5 micrometers.

[0022] Optionally, the touch panel further includes a barrier layer; the barrier layer is disposed between the display panel and the first metal layer.

[0023] Optionally, the display panel further includes an inorganic encapsulation layer; the inorganic encapsulation layer is arranged on a surface of the retaining wall close to the touch panel, and extends from the display area to a side of the retaining wall away from the display area.

[0024] On the other hand, a display device includes the touch screen described in the first aspect.

[0025] On the other hand, a method for preparing a touch screen includes: forming an inorganic packaging layer located on the surface of a display panel; using a gas-phase ultrasonic cleaning process to clean the surface of the inorganic packaging layer; forming a barrier layer on the surface of the inorganic packaging layer; using the gas-phase ultrasonic cleaning process to clean the surface of the barrier layer away from the inorganic packaging layer; forming a first metal layer on the surface of the barrier layer away from the inorganic packaging layer, the first metal layer including a touch auxiliary pattern and a first auxiliary pattern; wherein the touch pattern is located in the display area of ​​the touch screen, the first auxiliary pattern is located in the peripheral area of ​​the touch screen, the orthographic projection of the first auxiliary pattern on the display panel overlaps with the orthographic projection of a retaining wall in the display panel on the display panel; the first auxiliary pattern is a solid pattern.

[0026] The present invention provides a first auxiliary pattern on the surface of the retaining wall, and the first auxiliary pattern is a metal and solid pattern. On the one hand, because the first auxiliary pattern is a metal and has good ductility, in the water-containing processes such as water washing, glue coating and development after the first metal layer film, the first auxiliary pattern with good ductility can alleviate the external force impact of water washing in the water process, thereby reducing the possibility of cracks in the inorganic film layer on the surface of the retaining wall caused by the external force impact of water washing.

[0027] On the other hand, even if the inorganic film layer on the surface of the retaining wall is cracked under the impact of water force in the water process, the first auxiliary pattern is a solid pattern, and the first auxiliary pattern covers the surface of the retaining wall. In this way, the first auxiliary pattern can cover the cracks generated by the inorganic film layer on the surface of the retaining wall, thereby greatly reducing the possibility of water vapor in the water process entering the retaining wall, thereby reducing the possibility of the inorganic film layer on the surface of the retaining wall falling off, and also reducing the possibility of water vapor further entering the display panel and causing poor display. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A structural diagram of a display device provided in an embodiment of the present application;

[0030] Figure 2 A structural diagram of a touch screen provided in an embodiment of the present application;

[0031] Figure 3 A top view of a touch screen provided in an embodiment of the present application;

[0032] Figure 4 A cross-sectional view of a touch screen provided in an embodiment of the present application;

[0033] Figure 5 A top view of another touch screen provided in an embodiment of the present application;

[0034] Figure 6 A cross-sectional view of another touch screen provided in an embodiment of the present application;

[0035] Fig. 7A A flow chart of a touch screen manufacturing method provided in an embodiment of the present application;

[0036] Figure 7B A flowchart of another touch screen manufacturing method provided in an embodiment of the present application;

[0037] Figure 7C A flowchart of another touch screen manufacturing method provided in an embodiment of the present application;

[0038] Figure 8 A cross-sectional view of another touch screen provided in an embodiment of the present application;

[0039] Fig. 9 A structural diagram of a first auxiliary pattern provided in an embodiment of the present application;

[0040] Fig.10 A structural diagram of another first auxiliary pattern provided in an embodiment of the present application;

[0041] Fig.11 A structural diagram of another first auxiliary pattern provided in an embodiment of the present application;

[0042] Fig.12 A cross-sectional view of another touch screen provided in an embodiment of the present application;

[0043] Fig.13 A cross-sectional view of another touch screen provided in an embodiment of the present application;

[0044] Fig.14 A cross-sectional view of another touch screen provided in an embodiment of the present application.

[0045] Reference numerals:

[0046] 1000-display device; 100-touch screen; 110-middle frame; 120-housing; 130-cover plate; 1-display panel; 2-touch panel 10-blocking wall; 101-first blocking wall; 102-second blocking wall; 11-substrate; 12-light-emitting device; 121-anode; 122-cathode; 123-light-emitting material layer; 13-flat layer; 13(a)-first flat layer; 13(b)-second flat layer; 131-first hollow pattern; 132-third hollow pattern; 133-fifth hollow pattern; 14-encapsulation layer; 141-first inorganic encapsulation layer; 142-organic encapsulation layer; 143-second inorganic encapsulation layer; 15-pixel defining layer; 151-second hollow pattern; 152-fourth hollow pattern; 16-spacer; 17-anode transfer layer; 21-barrier layer; 22-first metal layer; 220-touch auxiliary pattern; 221-first auxiliary pattern; 222-second auxiliary pattern; 223-third auxiliary pattern; 224-fourth auxiliary pattern; 23-insulating layer; 24-second metal layer; 240-touch pattern; 25-protective layer; 30-pin group; AA-display area; Q-peripheral area; B-bending area. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0049] In addition, in the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components in the drawings.

[0050] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is just a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0051] With the continuous development of technology, full-screen technology is being used more and more widely. In order to achieve a full-screen, a part of the display device needs to be bent. Those skilled in the art have proposed a solution, that is, using a bending process to reduce the width of the lower frame of the display device. In the bending process, part of the display device needs to be folded to the back of the display panel, so as to achieve the purpose of reducing the width of the lower frame of the display device.

[0052] Based on this, an embodiment of the present application provides a display device. The display device involved in the embodiment of the present application can be, for example: a tablet computer, a mobile phone, an e-reader, a remote control, a personal computer (PC), a laptop computer, a personal digital assistant (PDA), a car-mounted device, an Internet TV, a wearable device, a television, and other smart devices with network functions.

[0053] The embodiments of the present application do not impose any special restrictions on the specific form of the above-mentioned display device. For the convenience of explanation, the following description is made using a mobile phone as an example of the display device.

[0054] like Figure 1 As shown, the display device 1000 mainly includes a touch screen 100 , a middle frame 110 , a housing 120 and a cover plate 130 , and the touch screen 100 and the middle frame 110 are disposed in the housing 120 .

[0055] The middle frame 110 is located between the touch screen 100 and the housing 120 . The surface of the middle frame 110 away from the touch screen 100 is used to install internal components such as batteries, circuit boards, cameras, antennas, etc.

[0056] The cover plate 130 is located at a side of the touch screen 100 away from the middle frame 110 . The cover plate 130 may be, for example, a cover glass (CG for short), and the cover glass may have a certain toughness.

[0057] The touch screen 100 has a light emitting side through which a display screen can be seen and a back side arranged opposite to the light emitting side. The back side of the touch screen 100 is close to the middle frame 110 , and the cover plate 130 is arranged on the light emitting side of the touch screen 100 .

[0058] The touch screen 100, as Figure 2 As shown, it includes a display panel 1 (display panel, DP for short) and a touch screen panel 2 (touch screen panel, TSP for short) arranged on the light emitting side of the display panel 1.

[0059] like Figure 2 As shown, in the bending process, part of the touch screen 100 is usually folded to the backlight side of the display panel 1 to reduce the border width of the touch screen 100 .

[0060] It should be noted that, in order to clearly illustrate the overall structure of the touch screen 100 , the bent portion of the display panel 1 is laid flat to illustrate the structure of the touch screen 100 .

[0061] like Figure 3 As shown in FIG. 1 (a top view of the touch screen 100), the touch screen 100 includes an active area (AA for short, also referred to as an effective display area), a peripheral area Q located outside the display area AA, and a bending area B located on one side of the display area AA. The bending area B is used to bend the touch screen 100 during the bending process. The touch panel 2 covers the display area AA of the touch screen 100.

[0062] Regarding the type of the display panel 1, in some embodiments of the present application, the display panel 1 may be, for example, an organic light emitting diode (OLED) display panel or a quantum dot light emitting diode (QLED) display panel.

[0063] For the convenience of description, the following description is given by taking the display panel 1 as an OLED display panel as an example.

[0064] The OLED display panel may be a top gate structure or a bottom gate structure. In addition, the OLED display panel may be a single data line layer (SD) structure or a double data line layer (double SD) structure. The OLED display panel provided in the embodiment of the present application is only an illustration and is not intended to be limiting.

[0065] In some embodiments provided in this application, Figure 4 As shown ( Figure 3 (a cross-sectional view taken along the AA direction), the display panel 1 may be a single SD structure OLED display panel.

[0066] like Figure 4 As shown, the display panel 1 includes a retaining wall 10 , a substrate 11 , a pixel driving circuit D, a light emitting device 12 , a planar layer 13 and an encapsulation layer 14 .

[0067] The substrate 11 may be made of a flexible resin material. In this case, the display panel 1 is a flexible display panel.

[0068] Regarding the pixel driving circuit D, for example, Figure 4 As shown, the pixel driving circuit D is disposed on one side of the substrate 11 , and the pixel driving circuit D is located in the display area AA of the touch screen 100 .

[0069] The pixel driving circuit D (or pixel circuit) is generally composed of thin film transistors (TFT), capacitors and other electronic devices. For example, the pixel circuit D can be a 2T1C pixel circuit composed of two thin film transistors (a switching TFT and a driving TFT) and a capacitor C. Of course, the pixel driving circuit D can also be composed of more than two thin film transistors (multiple switching TFTs and one or more driving TFTs) and at least one capacitor. The multiple switching TFTs included in the pixel driving circuit D can be formed synchronously with the driving TFT. Figure 4 Only the driving TFT in the pixel driving circuit D is shown schematically.

[0070] Regarding the structure of the light emitting device 12, for example, Figure 4 As shown, the light emitting device 12 is disposed on a side of the pixel driving circuit D away from the substrate 11 , and the light emitting device 12 is located in the display area AA of the touch screen 100 .

[0071] The light emitting device 12 includes an anode 121, a cathode 122, and an organic material functional layer disposed between the anode 121 and the cathode 122, wherein the organic material functional layer includes a light emitting material layer 123. The light emitting material layer 123 emits light when driven by a driving current between the anode 121 and the cathode 122.

[0072] like Figure 4As shown, in some embodiments, in order to improve the transmission efficiency of holes and electrons, the organic material functional layer may further include a hole transport layer (HTL) disposed between the anode 121 and the light-emitting material layer 123, and an electron transport layer (ETL) disposed between the cathode 122 and the light-emitting material layer 123.

[0073] like Figure 4 As shown, in some embodiments, in order to improve the efficiency of electron and hole injection into the light-emitting material layer 123, the organic material functional layer may further include a hole injection layer (HIL) disposed between the anode 121 and the HTL, and an electron injection layer (EIL) disposed between the cathode 122 and the ETL.

[0074] Regarding the planarization layer 13 (PLN for short), for example, Figure 4 As shown, the planar layer 13 is disposed between the pixel driving circuit D and the light emitting device 12 , and the planar layer 13 extends from the display area AA of the touch screen 100 to the edge of the substrate 11 .

[0075] It should be understood that the edge of the substrate 11 is included in the edge of the bent portion of the touch screen 100 during the bending process.

[0076] The material of the planar layer 13 is generally an insulating organic material, such as an organic siloxane resin. The organic siloxane resin material has good leveling properties, so the formed planar layer 13 can further improve the flatness of the surface of the pixel driving circuit D.

[0077] A plurality of vias are generally provided on the flat layer 13. The pixel driving circuit D can be coupled to the anode 121 of the light-emitting device 12 through the vias on the flat layer 13. The pixel driving circuit D is used to transmit a driving signal to the anode 121 of the light-emitting device 12. The cathode 122 of the light-emitting device 12 receives a power signal, thereby forming a driving current between the anode 121 and the cathode 122 to drive the light-emitting material layer 123 to emit light.

[0078] The plurality of light emitting devices 12 can emit light of multiple colors, for example, at least a first color, a second color, and a third color, where the first color, the second color, and the third color are three primary colors (for example, red, green, and blue). It can also be said that the display panel 1 includes a red sub-pixel (R) emitting red light, a green sub-pixel (G) emitting green light, and a blue sub-pixel (B) emitting blue light.

[0079] In addition, in order to avoid crosstalk between primary color lights emitted by adjacent light emitting devices 12, as shown in FIG. Figure 4 As shown, the display panel 1 further includes a pixel define layer 15 (PDL for short), and the PDL 15 is disposed between adjacent light emitting material layers 123 .

[0080] like Figure 4 As shown, the PDL 15 is disposed on the side of the flat layer 13 facing the touch panel 2 , and the PDL 15 extends from the display area AA to the bending area B of the touch screen 100 .

[0081] The main component of the PDL 15 is an organic material. For example, the PDL 15 may be mainly composed of black acrylic, or the PDL 15 may be mainly composed of polyacrylate.

[0082] In addition, if Figure 4 As shown, the display panel 1 further includes a spacer 16, which is disposed on a surface of the PDL 15 away from the substrate 11, and extends from the display area AA of the touch screen 100 to the peripheral area Q. The spacer 16 can be used to support a high-precision metal mask FMM (Fine Metal Mask, referred to as FMM) when evaporating the light-emitting material layer 123.

[0083] Regarding the encapsulation layer 14, for example, Figure 4 As shown, the encapsulation layer 14 is disposed on a side of the light emitting device 12 away from the substrate 11 , and the encapsulation layer 14 extends from the display area AA to the peripheral area Q of the touch screen 100 .

[0084] In some embodiments of the present application, the encapsulation layer 14 is composed of multiple layers of inorganic encapsulation layers and organic encapsulation layers arranged alternately. Figure 4 As shown, the encapsulation layer 14 is composed of a first inorganic encapsulation layer 141, an organic encapsulation layer 142, and a second inorganic encapsulation layer 143 which are stacked in sequence. The first inorganic encapsulation layer 141 is disposed on the surface of the retaining wall 10 close to the touch panel 2, and the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 extend from the display area AA of the touch screen 100 to the side of the retaining wall 10 away from the display area AA. The organic encapsulation layer 142 extends from the display area AA to the side of the retaining wall 10 close to the display area AA.

[0085] The materials of the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 are inorganic materials, such as one or more of silicon oxide, silicon nitride or silicon oxynitride, etc. The material of the organic encapsulation layer 142 is generally an organic material, such as polymethyl methacrylate.

[0086] On this basis, the organic encapsulation layer 142 located between the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 can be made by ink jet printing (IJP for short). In addition, the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 can be made by chemical vapor deposition (CVD for short). Since the material of the organic encapsulation layer 142 is an organic material, and the toughness of the organic material is good, it is beneficial for the display device 1000 to achieve curved display. The materials of the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 are inorganic materials. On the one hand, they can isolate water and oxygen in the outside air. On the other hand, they can protect the organic encapsulation layer 142 located between the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 and prevent the organic encapsulation layer 142 from being scratched and damaged.

[0087] Regarding the retaining wall 10, Figure 3 As shown, the display panel 1 includes at least one retaining wall 10, which is located in the peripheral area Q of the touch screen 100 and is used to prevent the organic material of the organic encapsulation layer 142 in the encapsulation layer 14 from overflowing. For example, the retaining wall 10 is arranged around the display area AA of the touch screen 100.

[0088] The number of the retaining walls 10 in the display panel 1 may be one or more, which is not limited in the embodiment of the present application.

[0089] In some embodiments, the display panel 1 includes a retaining wall.

[0090] In some other embodiments, the display panel 1 includes a plurality of retaining walls, for example, Figure 4 As shown, the display panel 1 includes two retaining walls 10, namely a first retaining wall 101 and a second retaining wall 102. Compared with the second retaining wall 102, the first retaining wall 101 is closer to the display area AA side.

[0091] The first retaining wall 101 is composed of a PDL 15 and a spacer 16 which are stacked in sequence, and the second retaining wall 102 is composed of a planar layer 13 , a PDL 15 , and a spacer 16 which are stacked in sequence.

[0092] like Figure 4As shown, the surfaces of the first retaining wall 101 and the second retaining wall 102 away from the substrate 11 are covered with the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 stacked. There is a large step difference between the sides of the first retaining wall 101 and the second retaining wall 102, and the force in the step difference area is uneven. Therefore, in the step difference area, the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 on the surface of the first retaining wall 101 are prone to cracks, and the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 on the surface of the second retaining wall 102 are prone to cracks. As a result, water vapor easily enters the display panel 1 along the cracks, causing the display panel 1 to display poorly.

[0093] The side surface of the first retaining wall 101 can be understood as a surface parallel to the extension direction of the first retaining wall 101 and intersecting with the substrate 11. The side surface of the second retaining wall 102 can be understood as a surface parallel to the extension direction of the second retaining wall 102 and intersecting with the substrate 11.

[0094] like Figure 3 As shown, the display panel 1 includes a bending area B, which is located on a side of the retaining wall 10 away from the display area AA and is used to realize bending of the touch screen 100 in a bending process.

[0095] Or it can be understood that the display panel 1 is a chip on PI (COP for short) type display panel 1 .

[0096] On this basis, if Figure 3 As shown, the display panel 1 further includes a pin group 30, and the pin group 30 includes a plurality of pins. According to the positions of the components on the substrate 11, the pin group 30 is located on the side of the bending area B away from the display area AA. Alternatively, it can be understood that the pin group 30 is closer to the edge of the substrate 11 relative to the bending area B.

[0097] like Figure 4 As shown, the pin group 30 is located on the surface of the flat layer 13 , so as to couple the pins with the wiring and the integrated circuit (IC) in the touch screen 100 , respectively, and transmit the control signal in the IC to the touch screen 100 .

[0098] Alternatively, in some other embodiments provided in this application, such as Figure 6 As shown, the display panel 1 is a dual SD structure OLED display panel.

[0099] like Figure 6 As shown, the display panel 1 includes a retaining wall 10 , a substrate 11 , a pixel driving circuit D, a light emitting device 12 , a planar layer 13 , an encapsulation layer 14 , a PDL 15 , a spacer 16 and an anode switching layer 17 .

[0100] The structures of the substrate 11, the pixel driving circuit D, the light emitting device 12, the encapsulation layer 14, the PDL 15 and the spacer 16 can be the same as those of the single SD structure OLED display panel, which can be referred to as Figure 4 Related description in .

[0101] Regarding the flat layer 13, Figure 6 As shown, the planar layer 13 is different from the planar layer 13 of the single SD structure OLED display panel in that the planar layer 13 includes a first planar layer 13 (a) and a second planar layer 13 (b) which are stacked in sequence.

[0102] The first planar layer 13 (a) and the second planar layer 13 (b) are disposed between the pixel driving circuit D and the light emitting device 12. The first planar layer 13 (a) and the second planar layer 13 (b) extend from the display area AA of the touch screen 100 to the edge of the substrate 11.

[0103] In some embodiments, the materials of the first planar layer 13 (a) and the second planar layer 13 (b) may be the same, for example, they may be organic siloxane resin. The first planar layer 13 (a) is used to improve the flatness of the surface of the pixel driving circuit D, and the second planar layer 13 (b) is used to improve the flatness of the surface of the anode switching layer 17.

[0104] Regarding the anode switching layer 17, Figure 6 As shown, the anode switching layer 17 is disposed on the surface of the first flat layer 13 (a) away from the substrate 11, and is located between the first flat layer 13 (a) and the second flat layer 13 (b). A plurality of vias are disposed on both the first flat layer 13 (a) and the second flat layer 13 (b). The anode switching layer 17 can be coupled to the pixel driving circuit D through the vias on the first flat layer 13 (a), and at the same time, coupled to the anode 121 of the light-emitting device 12 through the vias on the second flat layer 13 (b). The anode switching layer 17 is used to transmit the driving signal of the pixel driving circuit D to the light-emitting device 12.

[0105] Regarding the retaining wall 10, Figure 6 As shown, the difference between the retaining wall 10 and the retaining wall 10 of the single SD structure OLED display panel is that the film layer structure of the retaining wall 10 is different.

[0106] For example, Figure 6 As shown, the first retaining wall 101 is composed of a second flat layer 13 (b), PDL 15 and a spacer 16 stacked in sequence, and the second retaining wall 102 is composed of a first flat layer 13 (a), a second flat layer 13 (b), PDL 15 and a spacer 16 stacked in sequence.

[0107] The structure of the touch screen 100 is described in detail below by taking a single SD structure OLED display panel as an example.

[0108] Regarding the structure of the touch panel 2, in some embodiments of the present application, such as Figure 4 The touch panel 2 can be manufactured by a flexible multi-layer on cell (FMLOC) process. The FMLOC process refers to directly manufacturing a metal mesh electrode layer on the encapsulation layer 14 of the display panel 1 as a TSP, thereby performing touch control without an external TSP.

[0109] For example, Figure 5 As shown, on the side of the packaging layer 14 away from the substrate 11 , metal mesh wiring is made between the openings of the PDL 15 , and the metal mesh wiring constitutes the trigger electrode block and the receiving electrode block of the touch panel 2 .

[0110] In some embodiments of the present application, Figure 4 As shown, the touch panel 2 is arranged on the light emitting side of the display panel 1 , and the touch panel 2 includes a barrier layer 21 , a first metal layer 22 , an insulating layer 23 , a second metal layer 24 and a protective layer 25 which are stacked in sequence.

[0111] The barrier layer 21 is disposed on the surface of the second inorganic encapsulation layer 143 away from the barrier wall 10. It can also be said that the barrier layer 21 is disposed between the display panel 1 and the first metal layer 22, and the barrier layer 21 extends from the display area AA of the touch screen 100 to the edge of the substrate 11. The material of the barrier layer 21 may be an inorganic material, for example, silicon oxide, silicon nitride or silicon oxynitride.

[0112] like Figure 4 As shown, the barrier layer 21 covers the surface of the first retaining wall 101 and the second retaining wall 102. It can be understood that the surfaces of the first retaining wall 101 and the second retaining wall 102 are covered with the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143 and the barrier layer 21 which are stacked in sequence. There is a large step difference on the side of the first retaining wall 101 and the second retaining wall 102, and the force in the step difference area is uneven. Therefore, in the step difference area, the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143 and the barrier layer 21 are prone to cracks, so that water vapor easily enters the display panel 1 along the cracks, thereby causing poor display.

[0113] Regarding the first metal layer 22, for example, Figure 4 As shown, the first metal layer 22 includes a touch auxiliary pattern 220, and the touch auxiliary pattern 220 is located in the display area AA of the touch screen 100. The touch auxiliary pattern 220 can be used as a bridge film layer between the trigger electrode block and the receiving electrode block.

[0114] In some embodiments, the first metal layer 22 may be formed by stacking three metal film layers such as titanium / aluminum / titanium (Ti / Al / Ti).

[0115] In some other embodiments, the first metal layer 22 may be formed by stacking two oxide film layers such as indium tin oxide / silver / indium tin oxide (ITO / Ag / ITO) and a metal film layer.

[0116] Regarding the second metal layer 24, for example, Figure 4 As shown, the second metal layer 24 includes a touch pattern 240, and the touch pattern 240 is located in the display area AA of the touch screen 100. The touch pattern 240 can constitute the above-mentioned trigger electrode block and receiving electrode block for touch operation.

[0117] In some embodiments, the second metal layer 24 may be formed by stacking three metal film layers such as titanium / aluminum / titanium (Ti / Al / Ti).

[0118] In some other embodiments, the second metal layer 24 may be formed by stacking two oxide film layers such as indium tin oxide / silver / indium tin oxide (ITO / Ag / ITO) and a metal film layer.

[0119] Regarding the insulating layer 23, for example, Figure 4 As shown, the insulating layer 23 is disposed between the first metal layer 22 and the second metal layer 24 to prevent the first metal layer 22 from contacting the second metal layer 24. The material of the insulating layer 23 may be, for example, silicon oxide, silicon nitride or silicon oxynitride.

[0120] Regarding the protective layer 25, for example, Figure 4 As shown, the protection layer 25 is disposed on the surface of the second metal layer 24 away from the display panel 1 , and the material of the protection layer 25 may be, for example, polyimide (PI for short).

[0121] Based on this, in locations with step differences in the touch screen 100 , such as the side of the retaining wall 10 , the surfaces of the first hollow pattern 131 and the third hollow pattern 132 , etc., the inorganic film layer at such locations is prone to cracks.

[0122] The present application provides a method for preparing a touch screen. Fig. 7A and Figure 7B As shown, the following steps are included:

[0123] S10 , forming an inorganic encapsulation layer on the surface of the display panel 1 , and cleaning the surface of the inorganic encapsulation layer by using a water cleaning process.

[0124] For example, Figure 4As shown, the inorganic encapsulation layer includes a first inorganic encapsulation layer 141 and a second inorganic encapsulation layer 143 which are stacked. A water cleaning process is used to clean the surface of the second inorganic encapsulation layer 143 away from the substrate 11.

[0125] Then, during the water cleaning process, the external force during water cleaning will impact the surface of the second inorganic encapsulation layer 143 away from the substrate 11. From the above description, it can be seen that due to the step difference on the side of the retaining wall 10, the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 covering the side of the retaining wall 10 are prone to cracks. In this way, during the water cleaning process, the external force during water cleaning will impact the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 on the surface of the retaining wall 10, making it easier to crack. However, the water vapor in the water cleaning process will enter the retaining wall 10 along the cracks, causing the film layers of the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 on the surface of the retaining wall 10 to fall off. In severe cases, the water vapor further enters the display panel 1, causing poor display problems.

[0126] S20 , forming a barrier layer 21 on the surface of the inorganic encapsulation layer (the second inorganic encapsulation layer 143 ), and cleaning the surface of the barrier layer 21 away from the display panel 1 by a water cleaning process.

[0127] Similarly, during the water cleaning process, the external force during water cleaning will impact the surface of the barrier layer 21 away from the display panel 1. In this way, during the water cleaning process, the barrier layer 21 on the surface of the retaining wall 10 is subjected to the external force of water flushing, which makes it easy for cracks to form on the barrier layer 21 on the surface of the retaining wall 10, especially the barrier layer 21 on the side of the retaining wall 10 (the existence of a step difference), causing water vapor to enter the retaining wall 10 along the cracks, causing the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143 and the film layer of the barrier layer 21 on the surface of the retaining wall 10 to fall off.

[0128] S30, forming a first metal layer 22 on the surface of the barrier layer 21 away from the inorganic packaging layer, the first metal layer 22 including a touch auxiliary pattern 220, the touch auxiliary pattern 220 is located in the display area AA of the touch screen 100, and the touch auxiliary pattern 220 is prepared by a composition process (for example, including steps such as coating, exposure, development, and etching).

[0129] The touch auxiliary pattern 220 is prepared by a patterning process (for example, including steps such as glue coating, exposure, development, and etching), and the steps such as glue coating and development contain water-containing processes. In addition, before the patterning process, a water cleaning process is required to clean the surface of the first metal layer 22 away from the display panel 1. The external force impact of water during water cleaning can easily cause cracks in the various inorganic film layers (for example, the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143, and the barrier layer 21) on the surface of the retaining wall 10, especially the inorganic film layer on the side of the retaining wall 10 (the presence of a step difference). The water vapor in the water-containing processes such as glue coating and development will enter the retaining wall 10 along the cracks, causing the film layers of the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143, and the barrier layer 21 on the surface of the retaining wall 10 to fall off.

[0130] S40 , forming an insulating layer 23 on a surface of the first metal layer 22 away from the barrier layer 21 , and cleaning the surface of the insulating layer 23 away from the first metal layer 22 by a water cleaning process.

[0131] Similarly, water vapor in the water cleaning process will enter the retaining wall 10 along the cracks, causing the first inorganic encapsulation layer 141 , the second inorganic encapsulation layer 143 and the barrier layer 21 on the surface of the retaining wall 10 to fall off.

[0132] S50 , forming a second metal layer 24 on a surface of the insulating layer 23 away from the first metal layer 22 , wherein the second metal layer 24 includes a touch pattern 240 , and the touch pattern 240 is located in the display area AA. The touch pattern 240 is prepared by a patterning process.

[0133] The touch auxiliary pattern 220 is prepared by a patterning process (for example, including steps such as coating, exposure, development, and etching), and the coating and development steps include water-containing processes. Similarly, before the patterning process, a water cleaning process is required to clean the surface of the second metal layer 22 away from the display panel 1.

[0134] Similarly, cracks are easily generated in each inorganic film layer (e.g., the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143, and the barrier layer 21) on the surface of the retaining wall 10. Water vapor in water-containing processes such as coating and developing will enter the retaining wall 10 along the cracks, causing the film layers of the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143, and the barrier layer 21 on the surface of the retaining wall 10 to fall off.

[0135] S60 , forming a protective layer on a surface of the second metal layer 24 away from the insulating layer 23 .

[0136] In the above-mentioned method for preparing the touch screen 100, a water cleaning process is used to clean the inorganic encapsulation layer located on the surface of the display panel 1 and the barrier layer 21 located on the surface of the inorganic encapsulation layer. In the process of using the water cleaning process to clean the surface of the inorganic encapsulation layer, the external force during water cleaning will impact the surface of the inorganic encapsulation layer away from the substrate 11. As a result, it is easy to cause cracks in the inorganic encapsulation layer on the surface of the retaining wall 10, especially the inorganic encapsulation layer on the side of the retaining wall 10 (the existence of a step difference), which in turn causes water vapor to enter the retaining wall 10 along the cracks, causing the inorganic encapsulation layer on the surface of the retaining wall 10 to easily fall off. Similarly, using a water cleaning process to clean the barrier layer 21 is easy to cause cracks in the barrier layer 21, especially the barrier layer 21 on the side of the retaining wall 10 (the existence of a step difference). As a result, it is easy to cause water vapor to enter the retaining wall 10 along the cracks, causing the inorganic encapsulation layer on the surface of the retaining wall 10 and the barrier layer 21 to easily fall off.

[0137] Based on this, another method for preparing a touch screen 100 is provided in an embodiment of the present application. The method is different from the above-mentioned method for preparing the touch screen 100 in that a gas-phase ultrasonic cleaning process is used to clean the inorganic encapsulation layer on the surface of the display panel 1 and the surface of the barrier layer 21 on the surface of the inorganic encapsulation layer respectively.

[0138] A method for preparing a touch screen 100, such as Figure 7C As shown, the following steps are included:

[0139] S100 , forming an inorganic encapsulation layer on the surface of the display panel 1 , and cleaning the surface of the inorganic encapsulation layer by using a gas phase ultrasonic cleaning process.

[0140] For example, Figure 4 As shown, the inorganic encapsulation layer includes a first inorganic encapsulation layer 141 and a second inorganic encapsulation layer 143 which are stacked. A gas phase ultrasonic cleaning process is used to clean the surface of the second inorganic encapsulation layer 143 away from the substrate 11.

[0141] The solvents used in the gas-phase ultrasonic cleaning process are all highly volatile organic solvents, and no aqueous solvents are used. This avoids the problem that water vapor may enter the retaining wall 10 when using a water cleaning process, causing the first inorganic encapsulation layer 141 and the second inorganic encapsulation layer 143 on the surface of the retaining wall 10 to fall off.

[0142] S200 , forming a barrier layer 21 on the surface of the second inorganic encapsulation layer 143 , and cleaning the surface of the barrier layer 21 away from the display panel 1 by using a gas phase ultrasonic cleaning process.

[0143] Similarly, since the solvents used in the gas-phase ultrasonic cleaning process are all highly volatile organic solvents, and no aqueous solvents are used, this avoids the problem that water vapor may enter the retaining wall 10 when using a water cleaning process, causing the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143 and the barrier layer 21 on the surface of the retaining wall 10 to fall off.

[0144] S300 , forming a first metal layer 22 on a surface of the barrier layer 21 away from the second inorganic encapsulation layer 143 .

[0145] The formation process of the first metal layer 22 is the same as the formation process of the first metal layer 22 in the method for manufacturing the touch screen 100 , and reference may be made to the above description.

[0146] S400 , forming an insulating layer 23 on a surface of the first metal layer 22 away from the barrier layer 21 .

[0147] The formation process of the insulating layer 23 is the same as the formation process of the first metal layer 22 in the above-mentioned method for preparing the touch screen 100 , and the above description may be referred to.

[0148] S500 , forming a second metal layer 24 on a surface of the insulating layer 23 away from the first metal layer 22 .

[0149] The formation process of the second metal layer 24 is the same as the formation process of the insulating layer 23 in the above-mentioned method for preparing the touch screen 100 , and reference may be made to the above description.

[0150] S600 , forming a protective layer on a surface of the second metal layer 24 away from the insulating layer 23 .

[0151] However, in the preparation process of the first metal layer 22 and the second metal layer 24, processes such as water cleaning, glue coating and development are still involved, and in the preparation process of the insulating layer 23, a water cleaning process is still involved. The external force impact during the water cleaning process can still easily cause cracks in the various inorganic film layers (such as the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143 and the barrier layer 21) on the surface of the retaining wall 10. However, the water vapor in the glue coating and development process will still enter the retaining wall 10 along the cracks, causing the film layers of the first inorganic encapsulation layer 141, the second inorganic encapsulation layer 143 and the barrier layer 21 on the surface of the retaining wall 10 to fall off. In severe cases, water vapor may enter the display panel 1, causing the display panel 1 to display poorly.

[0152] In order to solve the above problems, the present application embodiment provides another touch screen 100, such as Figure 8 As shown, the touch screen 100 is different from the above touch screen 100 in that the first metal layer 22 in the touch panel 2 further includes a first auxiliary pattern 221 .

[0153] The touch screen 100 includes a display area AA and a peripheral area Q located outside the display area AA. The touch screen 100 includes a display panel 1 and a touch panel 2.

[0154] Regarding the display panel 1, Figure 8 As shown, the display panel 1 is the same as the display panel 1 in the above-mentioned touch screen 100 , and the above-mentioned related description may be referred to, and will not be repeated here.

[0155] Regarding the touch panel 2, Figure 8 As shown, the touch panel 2 includes a barrier layer 21, a first metal layer 22, an insulating layer 23, a second metal layer 24 and a protective layer 25. The barrier layer 21, the insulating layer 23, the second metal layer 24 and the protective layer 25 are the same as those in the above touch screen 100, and the above related descriptions may be referred to, and will not be repeated here.

[0156] like Figure 8 As shown, the first metal layer 22 includes a touch auxiliary pattern 220 and a first auxiliary pattern 221 .

[0157] The touch auxiliary pattern 220 is located in the display area AA of the touch screen 100 . In some embodiments, the touch auxiliary pattern 220 is a metal mesh pattern, which can constitute a bridging film layer between the trigger electrode block and the receiving electrode block of the touch screen 100 .

[0158] like Figure 8 As shown, the first auxiliary pattern 221 is located in the peripheral area Q of the touch screen 100, and the first auxiliary pattern 221 is a solid pattern. The orthographic projection of the first auxiliary pattern 221 on the display panel 1 overlaps with the orthographic projection of the retaining wall 10 on the display panel 1. It can be understood that the first auxiliary pattern 221 includes a portion covering the surface of the retaining wall 10.

[0159] In some embodiments, the orthographic projection of the first auxiliary pattern 221 on the display panel 1 partially overlaps with the orthographic projection of the retaining wall 10 on the display panel 1 , but partially does not overlap.

[0160] In some other embodiments, the orthographic projection of the first auxiliary pattern 221 on the display panel 1 completely overlaps with the orthographic projection of the retaining wall 10 on the display panel 1 .

[0161] In some other embodiments, Figure 8 As shown, the orthographic projection of the first auxiliary pattern 221 on the display panel 1 covers the orthographic projection of the retaining wall 10 on the display panel 1 .

[0162] Alternatively, it can be understood that the orthographic projection of the retaining wall 10 on the display panel 1 falls within the orthographic projection of the first auxiliary pattern 221 on the display panel 1 .

[0163] In this way, on the one hand, because the first auxiliary pattern 221 is metal and has good ductility, in the water-containing processes such as water cleaning, gluing and development after the first metal layer 22 film layer, the first auxiliary pattern 221 with good ductility can alleviate the external force impact of water washing in the water process, thereby reducing the possibility of cracks in the inorganic film layer on the surface of the retaining wall 10 (for example, the first inorganic packaging layer 141, the second inorganic packaging layer 143 and the barrier layer 21) caused by the external force impact of water washing.

[0164] On the other hand, even if the inorganic film layer on the surface of the retaining wall 10 is cracked under the impact of water force in the water process, the first auxiliary pattern 221 is a solid pattern, and the first auxiliary pattern 221 includes a portion covering the surface of the retaining wall 10. Then, the first auxiliary pattern 221 may cover the cracks generated by the inorganic film layer on the surface of the retaining wall 10, thereby reducing the possibility of water vapor in the water process entering the retaining wall 10, thereby reducing the possibility of the inorganic film layer on the surface of the retaining wall 10 falling off, and also reducing the possibility of water vapor further entering the display panel 1 and causing poor display.

[0165] On the other hand, the first auxiliary pattern 221 can block water and oxygen in the atmosphere, thereby preventing water and oxygen from invading the display panel 1 and causing poor display of the display panel 1 .

[0166] In some embodiments provided in the present application, a first auxiliary pattern 221 is correspondingly disposed on a side of each retaining wall 10 close to the touch panel 2 .

[0167] It can also be understood that the orthographic projection of each first auxiliary pattern 221 on the display panel 1 overlaps with the orthographic projection of its corresponding retaining wall 10 on the display panel 1 .

[0168] For example, Figure 8 As shown, a first auxiliary pattern 221 is disposed on a side of the first retaining wall 101 close to the touch panel 2, and the orthographic projection of the first auxiliary pattern 221 on the display panel 1 overlaps with the orthographic projection of the first retaining wall 101 on the display panel 1. A first auxiliary pattern 221 is also disposed on a side of the second retaining wall 102 close to the touch panel 2, and the orthographic projection of the first auxiliary pattern 221 on the display panel 1 overlaps with the orthographic projection of the second retaining wall 102 on the display panel 1.

[0169] In this way, the first auxiliary pattern 221 can cover the surface of each retaining wall 10, that is, the position where cracks may occur in the inorganic film layer on the surface of each retaining wall 10 is covered by the first auxiliary pattern 221. Then, the possibility of water vapor entering the retaining wall 10 during the water-containing processes such as water cleaning, glue coating and development of the film layer after the first metal layer 22 can be further reduced.

[0170] In some embodiments provided in the present application, the first auxiliary pattern 221 at least covers the side surface of the barrier wall 10 . The side surface of the barrier wall 10 can be understood as a surface parallel to the extension direction of the barrier wall 10 and intersecting with the substrate 11 .

[0171] For example, Fig. 9 As shown, the first auxiliary pattern 221 only covers the side surfaces of the retaining wall 10 .

[0172] Or, for example, Fig.10 As shown, the first auxiliary pattern 221 covers the surface of the barrier wall 10. It can also be understood that the first auxiliary pattern 221 covers the side surface of the barrier wall 10 and the upper surface of the barrier wall 10 farthest from the substrate 11.

[0173] As can be seen from the above description, the side of the retaining wall 10 has a large step difference, and the force at the step difference is uneven. In the step difference area, the inorganic film layer on the surface of the retaining wall 10 is more likely to crack. Therefore, the first auxiliary pattern 221 covers at least the side of the retaining wall 10, which also covers the position where the inorganic film layer on the surface of the retaining wall 10 is most likely to crack, thereby greatly reducing the possibility of water vapor entering the retaining wall 10 during water-containing processes such as water cleaning, glue coating and development of the film layer after the first metal layer 22.

[0174] In some embodiments provided in the present application, a plurality of first auxiliary patterns 221 corresponding to a plurality of retaining walls 10 are connected to each other.

[0175] For example, Fig.11 As shown, the first auxiliary pattern 221 corresponding to the first retaining wall 101 and the first auxiliary pattern 221 corresponding to the second retaining wall 102 are connected to each other.

[0176] That is to say, the inorganic film layer between the plurality of retaining walls 10 is also covered by the first auxiliary pattern 221, and the cracks that may be generated on the inorganic film layer between the plurality of retaining walls 10 are also covered by the first auxiliary pattern 221. In this way, on the one hand, water vapor can be better blocked, and on the other hand, the difficulty of patterning when preparing the first auxiliary pattern 221 can be reduced.

[0177] In some embodiments provided in this application, Fig. 9 As shown, the distance from the edge of the first auxiliary pattern 221 to the edge of the retaining wall 10 is greater than 5 micrometers, for example, 6 micrometers, 7 micrometers, 10 micrometers, 12 micrometers, 16 micrometers, 18 micrometers or 20 micrometers.

[0178] That is to say, the first auxiliary pattern 221 can cover the edge of the retaining wall 10, so that the position where the inorganic film layer on the surface of the retaining wall 10 may have cracks can be covered by the first auxiliary pattern 221. In this way, the possibility of water vapor entering the retaining wall 10 during the water-containing processes such as water cleaning, glue coating and development of the film layer after the first metal layer 22 can be further reduced.

[0179] In some embodiments provided in the present application, the touch screen 100 further includes a reference ground signal terminal, and the first auxiliary pattern 221 is coupled to the reference ground signal terminal. In other words, the reference ground signal terminal can output a constant signal to the first auxiliary pattern 221 .

[0180] Alternatively, in some other embodiments provided in the present application, the first auxiliary pattern 221 is coupled to an IC. In other words, the IC can output a constant signal to the first auxiliary pattern 221 .

[0181] In this way, on the one hand, electrostatic damage caused by the accumulation of charges on the first auxiliary pattern 221 can be prevented, and on the other hand, interference of external noise on the touch signal in the touch panel 2 can be reduced.

[0182] The embodiment of the present application provides a method for manufacturing a touch screen 100 , which still uses a gas phase ultrasonic cleaning process to clean the inorganic encapsulation layer on the surface of the display panel 1 and the surface of the barrier layer 21 on the surface of the inorganic encapsulation layer.

[0183] Then, a first metal layer 22 is formed on a surface of the barrier layer 21 away from the inorganic encapsulation layer. The first metal layer 22 includes a touch auxiliary pattern 220 and a first auxiliary pattern 221 .

[0184] The touch auxiliary pattern 220 is located in the display area AA of the touch screen 100, and the first auxiliary pattern 221 is located in the peripheral area Q of the touch screen 100. The orthographic projection of the first auxiliary pattern 221 on the display panel 1 overlaps with the orthographic projection of the display panel 1 retaining wall 10 on the display panel 1. The first auxiliary pattern 221 is a solid pattern.

[0185] In this way, on the one hand, because the solvents used in the gas-phase ultrasonic cleaning process are all highly volatile organic solvents, and no aqueous solvents are used, the possibility of water vapor entering the retaining wall 10 caused by the water cleaning process can be avoided. On the other hand, the first auxiliary pattern 221 covers the surface of the retaining wall 10. The first auxiliary pattern 221 is metal and has good ductility, so it can buffer the external force of water washing in the water-containing processes such as water cleaning, glue coating and development of the film layer after the first metal layer 22, and reduce the possibility of inorganic film layer on the surface of the retaining wall 10. The first auxiliary pattern 221 is a solid pattern, so the possibility of water vapor entering the retaining wall 10 in the above-mentioned water process can be reduced.

[0186] In some implementations provided in this application, such as Figure 8 As shown, the display panel 1 includes a planar layer 13 and a PDL 15 disposed on a side of the planar layer 13 facing the touch panel 2 .

[0187] The flat layer 13 has a first hollow pattern 131 in the bending area B, and the first hollow pattern 131 is located on the side of the retaining wall 10 away from the display area AA. It can also be understood that the first hollow pattern 131 is arranged at the edge of the bending area B close to the peripheral area Q.

[0188] The existence of the first hollow pattern 131 can interrupt the bending stress when the touch screen 100 is bent, so as to achieve the effect of releasing the bending stress when the touch screen 100 is bent, thereby extending the service life of the touch screen 100.

[0189] The PDL 15 has a second hollow pattern 151 in the bending area B. The second hollow pattern 151 is located on a side of the retaining wall 10 away from the display area AA.

[0190] In some embodiments, the orthographic projection of the second hollow pattern 151 on the display panel 1 partially overlaps with the orthographic projection of the first hollow pattern 131 on the display panel 1 .

[0191] In some other embodiments, the orthographic projection of the second hollow pattern 151 on the display panel 1 does not overlap with the orthographic projection of the first hollow pattern 131 on the display panel 1 .

[0192] In some other embodiments, Figure 8 As shown, the orthographic projection of the second hollow pattern 151 on the display panel 1 and the orthographic projection of the first hollow pattern 131 on the display panel 1 completely overlap.

[0193] For example, Figure 8 As shown, the first hollow pattern 131 and the second hollow pattern 151 constitute a groove located in the bending area B.

[0194] The groove formed by the second hollow pattern 151 on the PDL 15 and the first hollow pattern 131 on the flat layer 13 can interrupt the bending stress of the touch screen 100 when it is bent, so as to release the bending stress of the touch screen 100 when it is bent and extend the service life of the touch screen 100.

[0195] like Figure 8 As shown, the barrier layer 21 covers the surface of the first hollow pattern 131 on the flat layer 13. However, the surface where the first hollow pattern 131 and the flat layer 13 intersect has a large step difference, and the force in the step difference area is uneven. Therefore, in the step difference area, the barrier layer 21 on the surface of the first hollow pattern 131 is prone to cracks.

[0196] like Figure 8As shown, the barrier layer 21 covers the surface of the second hollow pattern 151 on the PDL 15. However, the surface where the second hollow pattern 151 and the PDL 15 intersect has a large step difference, and the force in the step difference area is uneven. Therefore, in the step difference area, the barrier layer 21 on the surface of the second hollow pattern 151 is prone to cracks.

[0197] Based on this, in some embodiments provided in this application, such as Fig.12 As shown, the first metal layer 22 further includes a second auxiliary pattern 222. The second auxiliary pattern 222 is a solid pattern.

[0198] The orthographic projection of the second auxiliary pattern 222 on the display panel 1 overlaps with the orthographic projection of the second hollow pattern 151 on the display panel 1 .

[0199] In some embodiments, the orthographic projection of the second auxiliary pattern 222 on the display panel 1 completely overlaps with the orthographic projection of the second hollow pattern 151 on the display panel 1 .

[0200] In some other embodiments, the orthographic projection of the second auxiliary pattern 222 on the display panel 1 partially overlaps with the orthographic projection of the second hollow pattern 151 on the display panel 1 .

[0201] In some other embodiments, Fig.12 As shown, the orthographic projection of the second auxiliary pattern 222 on the display panel 1 covers the orthographic projection of the second hollow pattern 151 on the display panel 1 .

[0202] It should be understood that the second auxiliary pattern 222 is located on the surface of the barrier layer 21 away from the display panel 1, and the second auxiliary pattern 222 can cover the surface of the barrier layer 21 that is prone to cracks. In this way, the possibility of water vapor entering between the barrier layer 21 and the PDL 15 during the water-containing processes such as water cleaning, glue coating and development of the film layer after the first metal layer 22 can be greatly reduced, thereby reducing the possibility of the bonding force between the PDL 15 and the barrier layer 21 being reduced, and the possibility of the barrier layer 21 film falling off is reduced.

[0203] In some embodiments of the present application, Fig.12 As shown, the second auxiliary pattern 222 covers the second hollow pattern 151 and overlaps with the PDL 15 .

[0204] That is to say, the second auxiliary pattern 222 can cover the outside of the contour of the second hollow pattern 151, and the barrier layer 21 outside the contour of the second hollow pattern 151 is also covered by the second auxiliary pattern 151, so the positions of the barrier layer 21 outside the contour of the second hollow pattern 151 where cracks may occur are all covered by the second auxiliary pattern 222. In this way, the possibility of water vapor entering between the barrier layer 21 and the PDL 15 is further reduced, and the possibility of the barrier layer 21 film falling off is reduced.

[0205] In some embodiments of the present application, the distance from the edge of the second auxiliary pattern 222 to the edge of the second hollow pattern 151 is greater than 5 microns, for example, it can be 6 microns, 7 microns, 10 microns, 12 microns, 16 microns, 18 microns or 20 microns.

[0206] In some embodiments provided in this application, Fig.12 As shown, the planar layer 13 further has a third hollow pattern 132, and the PDL 15 has a fourth hollow pattern 152. The third hollow pattern 132 and the fourth hollow pattern 152 are located on a side of the first hollow pattern 131 close to the peripheral region Q.

[0207] It can be understood that the third hollow pattern 132 and the fourth hollow pattern 152 are located on a side of the retaining wall 10 close to the bending area B.

[0208] In some embodiments, Fig.12 As shown, the orthographic projection of the fourth hollow pattern 152 on the display panel 1 covers the orthographic projection of the third hollow pattern 132 on the display panel 1 .

[0209] like Fig.12 As shown, the barrier layer 21 covers the surface of the third hollow pattern 132 on the flat layer 13 away from the retaining wall 10. However, there is a large step difference between the surface where the third hollow pattern 132 intersects with the flat layer 13 in the bending area B, and the force in the step difference area is uneven. Therefore, in the step difference area, the barrier layer 21 on the surface of the third hollow pattern 132 is prone to cracks.

[0210] like Fig.12 As shown, the barrier layer 21 covers the surface of the fourth hollow pattern 152 on the PDL 15 away from the retaining wall 10. However, there is a large step difference between the surface where the fourth hollow pattern 152 intersects with the PDL 15 in the bending area B, and the force in the step difference area is uneven. Therefore, in the step difference area, the barrier layer 21 on the surface of the fourth hollow pattern 152 is prone to cracks.

[0211] Based on this, in some embodiments provided in this application, such as Fig.13 As shown, the first metal layer 22 further includes a third auxiliary pattern 223. The third auxiliary pattern 223 is a solid pattern.

[0212] The orthographic projection of the third auxiliary pattern 223 on the display panel 1 overlaps with the orthographic projection of the fourth hollow pattern 152 on the display panel 1. The positional relationship between the third auxiliary pattern 223 and the fourth hollow pattern 152 is the same as the positional relationship between the second auxiliary pattern 222 and the second hollow pattern 151, and the above description may be referred to.

[0213] Similarly, the third auxiliary pattern 223 can cover the surface of the barrier layer 21 that is prone to cracks. In this way, the possibility of water vapor entering between the barrier layer 21 and the PDL 15 during the water-containing processes such as water cleaning, glue coating and development of the film layer after the first metal layer 22 can be reduced, thereby reducing the possibility of the bonding force between the PDL 15 and the barrier layer 21 being reduced, and thus reducing the possibility of the barrier layer 21 film falling off.

[0214] In some embodiments of the present application, Fig.13 As shown, the third auxiliary pattern 223 covers the fourth hollow pattern 152 and overlaps with the PDL 15 .

[0215] That is to say, the third auxiliary pattern 223 can cover the outside of the outline of the fourth hollow pattern 152, and the barrier layer 21 outside the outline of the fourth hollow pattern 152 is also covered by the third auxiliary pattern 223, so the positions of the barrier layer 21 outside the outline of the fourth hollow pattern 152 where cracks may occur are all covered by the third auxiliary pattern 223. In this way, the possibility of water vapor entering between the barrier layer 21 and the PDL 15 in the above-mentioned water-containing process is further reduced, and the possibility of the barrier layer 21 film falling off is reduced.

[0216] In some embodiments of the present application, the distance from the edge of the third auxiliary pattern 223 to the edge of the fourth hollow pattern 152 is greater than 5 microns, for example, it can be 6 microns, 7 microns, 10 microns, 12 microns, 16 microns, 18 microns or 20 microns.

[0217] In some implementations provided in this application, such as Fig.13 As shown, the display panel 1 includes a planar layer 13 and a pin group 30 .

[0218] The flat layer 13 also has a fifth hollow pattern 133, and the location of the fifth hollow pattern 133 is used to set the pin group 30 of the display panel 1. Fig.13 As shown, the pin group 30 is located within the outline of the fifth hollow pattern 133 (after the touch screen 100 is bent, the pin group 30 is located on the backlight side of the display panel 1, Fig.13 100 is the touch screen 100 when it is not bent).

[0219] like Fig.13 As shown, the barrier layer 21 covers the surface of the fifth hollow pattern 133 on the flat layer 13. However, the surface where the fifth hollow pattern 133 and the flat layer 13 intersect has a large step difference, and the force in the step difference area is uneven. Therefore, in the step difference area, the barrier layer 21 on the surface of the fifth hollow pattern 133 is prone to cracks.

[0220] Based on this, in some embodiments provided in this application, such as Fig.14As shown, the first metal layer 22 further includes a fourth auxiliary pattern 224. The fourth auxiliary pattern 224 is a solid pattern.

[0221] The orthographic projection of the fourth auxiliary pattern 224 on the display panel 1 overlaps with the orthographic projection of the fifth hollow pattern 133 on the display panel 1 , and does not overlap with the orthographic projection of the pin group 30 on the display panel 1 .

[0222] It should be understood that the fourth auxiliary pattern 224 is located on the surface of the barrier layer 21 away from the display panel 1, and the fourth auxiliary pattern 224 can cover the surface of the barrier layer 21 that is prone to cracks. In this way, the possibility of water vapor entering between the barrier layer 21 and the flat layer 13 during the water-containing processes such as water cleaning, glue coating and development of the film layer after the first metal layer 22 can be greatly reduced, thereby reducing the possibility of the barrier layer 21 film falling off due to the reduction of the bonding force between the flat layer 13 and the barrier layer 21 caused by the invasion of water vapor. Then, the pin group 30 on the surface of the barrier layer 21 is not easy to fall off.

[0223] In some embodiments of the present application, Fig.14 As shown, the fourth auxiliary pattern 224 overlaps with the planar layer 13 .

[0224] In some embodiments of the present application, the distance from the edge of the fourth auxiliary pattern 224 to the edge of the fifth hollow pattern 133 is greater than 5 microns, for example, it can be 6 microns, 7 microns, 10 microns, 12 microns, 16 microns, 18 microns or 20 microns.

[0225] In this way, the fourth auxiliary pattern 224 can cover the outside of the outline of the fifth hollow pattern 133, and the barrier layer 21 outside the outline of the fifth hollow pattern 133 is also covered by the fourth auxiliary pattern 224, so the positions of the barrier layer 21 outside the outline of the fifth hollow pattern 133 where cracks may occur are all covered by the fourth auxiliary pattern 224. In this way, the possibility of water vapor entering between the barrier layer 21 and the flat layer 13 in the above-mentioned water-containing process is further reduced, and the possibility of the barrier layer 21 film falling off is reduced.

[0226] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A touch screen, characterized in that: comprising a display area and a peripheral area located outside the display area; The display panel comprises at least one retaining wall, wherein the retaining wall is located in the peripheral area; A touch panel, arranged on the light-emitting side of the display panel, the touch panel comprising a first metal layer and a second metal layer, wherein the second metal layer is arranged on a side of the first metal layer away from the display panel; The first metal layer includes a touch auxiliary pattern and a first auxiliary pattern, the touch auxiliary pattern is located in the display area, the first auxiliary pattern is located in the peripheral area, and the orthographic projection of the first auxiliary pattern on the display panel overlaps with the orthographic projection of the retaining wall on the display panel; the first auxiliary pattern is a solid pattern; The second metal layer includes a touch pattern, and the touch pattern is located in the display area.

2. The touch screen according to claim 1, characterized in that: The first auxiliary pattern is correspondingly arranged on one side of each of the retaining walls close to the touch panel.

3. The touch screen according to claim 2, characterized in that: The first auxiliary pattern at least covers a side surface of the retaining wall.

4. The touch screen according to claim 2, characterized in that: The plurality of first auxiliary patterns corresponding to the plurality of retaining walls are connected to each other.

5. The touch screen according to any one of claims 1 to 4, characterized in that: The touch screen includes a reference ground signal terminal, and the first auxiliary pattern is coupled to the reference ground signal terminal; or, The touch screen includes an integrated circuit, and the first auxiliary pattern is coupled to the integrated circuit.

6. The touch screen according to claim 1, characterized in that: The display panel further includes a planar layer and a pixel defining layer arranged on a side of the planar layer facing the touch panel; The planar layer has a first hollow pattern, and the pixel defining layer has a second hollow pattern; the first hollow pattern and the second hollow pattern are located on a side of the retaining wall away from the display area; The first metal layer further includes a second auxiliary pattern, and an orthographic projection of the second auxiliary pattern on the display panel overlaps with an orthographic projection of the second hollow pattern on the display panel.

7. The touch screen according to claim 6, characterized in that: The second auxiliary pattern covers the second hollow pattern and overlaps with the pixel defining layer.

8. The touch screen according to claim 6, characterized in that: The planar layer further has a third hollow pattern, and the pixel defining layer has a fourth hollow pattern; the third hollow pattern and the fourth hollow pattern are located on a side of the first hollow pattern close to the display area; The first metal layer further includes a third auxiliary pattern, and an orthographic projection of the third auxiliary pattern on the display panel overlaps with an orthographic projection of the fourth hollow pattern on the display panel.

9. The touch screen according to claim 8, characterized in that: The third auxiliary pattern covers the fourth hollow pattern and overlaps with the pixel defining layer.

10. The touch screen according to any one of claims 1 to 4 or any one of claims 6 to 9, characterized in that: The display panel also includes a flat layer and a pin group; The flat layer has a fifth hollow pattern, and the pin group is located within the outline of the fifth hollow pattern and on the backlight side of the display panel; The first metal layer further includes a fourth auxiliary pattern, an orthographic projection of the fourth auxiliary pattern on the display panel overlaps with an orthographic projection of the fifth hollow pattern on the display panel, and does not overlap with an orthographic projection of the pin group on the display panel.

11. The touch screen according to claim 10, characterized in that: The fourth auxiliary pattern overlaps the planar layer.

12. The touch screen according to claim 10, characterized in that: The distance between the edge of the first auxiliary pattern and the edge of the retaining wall is greater than 5 microns; and / or, The distance between the edge of the second auxiliary pattern and the edge of the second hollow pattern is greater than 5 microns; and / or, The distance between the edge of the third auxiliary pattern and the edge of the fourth hollow pattern is greater than 5 micrometers; and / or, The distance from the edge of the fourth auxiliary pattern to the edge of the fifth hollow pattern is greater than 5 micrometers.

13. The touch screen according to claim 1, characterized in that: The touch panel further includes a barrier layer; The barrier layer is disposed between the display panel and the first metal layer.

14. The touch screen according to claim 1 or 13, characterized in that: The display panel further includes an inorganic encapsulation layer; The inorganic encapsulation layer is arranged on a surface of the retaining wall close to the touch panel, and extends from the display area to a side of the retaining wall away from the display area.

15. A display device, characterized in that: A touch screen comprising any one of claims 1-14.

16. A method for preparing a touch screen, characterized in that: include: forming an inorganic encapsulation layer on the surface of the display panel; Using a gas phase ultrasonic cleaning process to clean the surface of the inorganic encapsulation layer; forming a barrier layer on the surface of the inorganic encapsulation layer; Using the gas phase ultrasonic cleaning process to clean the surface of the barrier layer away from the inorganic encapsulation layer; forming a first metal layer on a surface of the barrier layer away from the inorganic encapsulation layer, wherein the first metal layer includes a touch auxiliary pattern and a first auxiliary pattern; Among them, the touch auxiliary pattern is located in the display area of ​​the touch screen, the first auxiliary pattern is located in the peripheral area of ​​the touch screen, and the orthographic projection of the first auxiliary pattern on the display panel overlaps with the orthographic projection of the retaining wall in the display panel on the display panel; the first auxiliary pattern is a solid pattern.

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