Display substrate, display module and display device

Abstract

The display substrate, the display module and the display device are provided, the display substrate comprises a main body area and a bending area on one side of the main body area, the bending area is provided with at least one first alignment mark and an alignment window corresponding to each first alignment mark; the bending area comprises a signal line metal layer which is laminated on a flexible substrate, and the signal line metal layer is arranged outside the alignment window; the main body area is provided with a second alignment mark for alignment with each first alignment mark, when the bending area is bent to the backlight side of the main body area, the orthographic projection of the second alignment mark on the flexible substrate of the main body area at least partially overlaps with the orthographic projection of the corresponding alignment window on the flexible substrate of the main body area, so as to identify the second alignment mark through the alignment window.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a display substrate, a display module and a display device. BACKGROUND

[0002] With the development of narrow frame display products, Pad Bending technology emerges as the times require. Pad Bending technology needs to perform special-shaped cutting on a display substrate, and fold a Pad area to the back of the display substrate to reduce the frame width. However, due to the influence of alignment accuracy, a folding area is prone to have a wrinkle area, and the wiring in the wrinkle area will be deformed, and even be broken in severe cases, thereby causing crack in the folding area and causing display abnormalities. SUMMARY

[0003] In view of the above problems, the present disclosure is proposed to provide a display substrate, a display module and a display device which are beneficial to improve the above problems or at least partially improve the above problems.

[0004] In a first aspect, the embodiments of the present disclosure further provide a display substrate, comprising a flexible substrate, the display substrate comprising: a main body area and a folding area located on one side of the main body area, the folding area being provided with at least one first alignment mark and an alignment window corresponding to each first alignment mark.

[0005] The folding area comprises a signal line metal layer which is laminated on the flexible substrate, and the signal line metal layer is arranged outside the alignment window.

[0006] The main body area is provided with a second alignment mark for alignment with each first alignment mark, and when the folding area is folded to the back side of the main body area, the orthographic projection of the second alignment mark on the flexible substrate of the main body area at least partially overlaps with the orthographic projection of the corresponding alignment window on the flexible substrate of the main body area, so as to identify the second alignment mark through the alignment window.

[0007] Further, a through hole is formed at the position of the alignment window, and the depth of the through hole is equal to the thickness of the folding area in the direction perpendicular to the flexible substrate.

[0008] Further, the alignment window at least retains the flexible substrate, and the transmittance of the alignment window is greater than or equal to 50%.

[0009] Further, the orthographic projection of the alignment window on the flexible substrate of the main body area is a first projection area, the orthographic projection of the second alignment mark corresponding to the alignment window on the flexible substrate of the main body area is a second projection area, and the second projection area is located in the first projection area.

[0010] Further, the size of the alignment window is greater than the size of the second alignment mark, and the edge of the second projection area has a gap with the edge of the first projection area.

[0011] Further, the bending area includes a first region, a second region and a third region arranged along a first direction, the second region is located between the first region and the third region, and the first direction is parallel to a pixel row direction of the display substrate.

[0012] At least one first alignment mark and the alignment window corresponding to each first alignment mark are located in the second region.

[0013] Further, the main body area includes a display area and a bezel area located at the periphery of the display area, and a side bezel area close to the bending area includes a first corner area close to the first region, a second corner area close to the third region, and a transition area located between the first corner area and the second corner area, the second alignment mark is arranged in the transition area, and when the bending area is bent to the backlight side of the main body area, the transition area is covered by the bending area.

[0014] The first region and / or the third region are provided with a third alignment mark, and the first corner area and / or the second corner area are correspondingly provided with a fourth alignment mark for alignment with the third alignment mark.

[0015] In a second aspect, the embodiments of the present disclosure further provide a display module, including the display substrate provided in the first aspect.

[0016] Further, the display module further includes a back film arranged on the backlight side of the display substrate, and the back film is provided with a hollow opening opposite to the alignment window.

[0017] Further, the display module further includes a heat dissipation film arranged on the backlight side of the main body area, and the heat dissipation film is provided with an opening opposite to the second alignment mark of the main body area to expose the second alignment mark.

[0018] In a third aspect, the embodiments of the present disclosure further provide a display device, including the display module provided in the second aspect.

[0019] The technical solutions provided in the embodiments of the present disclosure have at least the following technical effects or advantages:

[0020] The display substrate, the display module and the display device provided by the embodiments of the present disclosure set at least one first alignment mark and an alignment window corresponding to each first alignment mark in the bending area, and arrange the signal line metal layer of the bending area outside the alignment window, so that the alignment window has a certain transparency, thereby when the bending area is bent to the backlight side of the main body area, the second alignment mark correspondingly arranged in the main body area can be recognized through the alignment window. The scheme makes the setting position of the alignment mark not affected by the shielding of the bending area to the main body area, so that enough alignment marks can be set in the bending area according to the actual product needs, thereby facilitating to improve the bending alignment accuracy, increase the Pad Bending yield of the medium and large size product, reduce the risk of wrinkles caused by bending, and reduce the display abnormal problem caused by the line fracture of the bending area.

[0021] The above description is only a summary of the technical solutions provided by the embodiments of the present disclosure, in order to enable the technical means of the embodiments of the present disclosure to be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the embodiments of the present disclosure more obvious and easy to understand, the following specific embodiments of the present disclosure are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application. Moreover, the same reference numerals are used throughout the same figures. In the drawings:

[0023] Figure 1 A back view of an exemplary display substrate;

[0024] Figure 2 A schematic diagram of a folding area of Figure 1 A schematic diagram of a folding area of

[0025] Figure 3 A fracture micrograph of the folding area wrinkle problem;

[0026] Figure 4 A structure schematic diagram of an exemplary display substrate in the embodiments of the present disclosure;

[0027] Figure 5 A back view of an exemplary display module in the embodiments of the present disclosure;

[0028] Figure 6 A back view of another exemplary display module in the embodiments of the present disclosure;

[0029] Figure 7 A front projection schematic diagram of the alignment window and the second alignment mark in the embodiments of the present disclosure;

[0030] Figure 8 This is a schematic diagram of the partitioning of the bending area in an embodiment of this disclosure;

[0031] Figure 9 As described in this embodiment of the disclosure Figure 5 A schematic diagram of the aa cross section (using the first type of alignment window structure);

[0032] Figure 10 As described in this embodiment of the disclosure Figure 5 A schematic diagram of the AA cross section (using the second type of alignment window structure);

[0033] Figure 11 This is a schematic diagram of the heat dissipation film layout in an embodiment of this disclosure. Detailed Implementation

[0034] To improve the accuracy of bending alignment, alignment marks are usually set on the display panel, and positioning is achieved by recognizing the alignment marks.

[0035] Figure 1 The diagram shows a rear view of the display substrate with the bending area PB in a bent state, i.e., a top view of the backlight side of the display substrate. Figure 1 As shown, in some examples, alignment marks M1 are set on the left and right sides of the bending area PB of the display substrate (e.g., Figure 1 In the cross-shaped alignment mark), correspondingly, alignment mark M2 is set at the left and right corners of the main body area PM near the bend area PB (not covered by the bend area PB). Figure 1 (T-shaped alignment mark in the middle). During the Pad Bending operation, the alignment mark M1 on the bending area PB is aligned with the alignment mark M2 on the main body area PM to ensure the accuracy of Pad Bending.

[0036] However, when the product size is large, the bending area width D can reach over 350mm (the bending area width D of current conventional mobile phone products is < 60mm). For medium to large-sized products, according to... Figure 1 The alignment scheme shown has a misalignment in the middle area of ​​the bending zone PB, indicating an unmonitored state and potential risks such as wrinkles. Figure 2 As shown in the image. Microscopic observation reveals that the traces in the wrinkled areas are deformed, and in severely affected areas, they break. A microscopic image of the breakage location is shown below. Figure 3 As shown, in the bending area PB, where the deformation is more severe, the traces are deformed and the panel substrate is also broken, which can easily cause display abnormalities.

[0037] Based on this, the disclosure embodiment provides a bending area alignment scheme suitable for Pad Bending technology, at least one first alignment mark is arranged in the bending area, and a corresponding alignment window is arranged for each first alignment mark, and the signal line metal layer of the bending area is arranged outside the alignment window, so that the alignment window has a certain transparency, so that when the bending area is bent to the backlight side of the main body area, the second alignment mark arranged in the main body area can be recognized through the alignment window. The scheme makes the setting position of the alignment mark not affected by the shielding caused by the bending area to the main body area, so that enough alignment marks can be set in the bending area according to the actual product needs, for example, the alignment marks can be set in the middle area of the bending area on the basis of the scheme shown in Figure 1 The scheme effectively improves the bending alignment accuracy, is beneficial to increase the Pad Bending yield of medium and large size products, reduces the risk of line breakage caused by bending wrinkles, and reduces the display abnormal problem caused by line breakage in the bending area.

[0038] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0039] It should be noted that the term "and / or" appearing in the present document is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. The term "multiple" appearing in the present document includes two or more cases.

[0040] An embodiment of the present disclosure provides a display module, comprising a display substrate 10. The display substrate 10 is a flexible display substrate, for example, it can be an OLED (Organic Light-Emitting Diode) display substrate, a QLED (Quantum Dot Light Emitting Diodes) display substrate, etc., and the present embodiment does not limit this.

[0041] Figure 4 A schematic diagram of a display substrate is shown after the completion of the mother board cutting, and the bending area is in an unbent state. As Figure 4 shown, the display substrate 10 includes a main body area 110 and a bending area 120 located on one side of the main body area 110. The bending area 120, also known as the Pad bending area, can be bent to the backlight side of the main body area 110.

[0042] The display substrate 10 comprises a flexible substrate 100. For example, the base material of the flexible substrate 100 can be polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc., which is not limited in the embodiment.

[0043] The main area 110 of the display substrate 10 comprises a display area 101 (Active Area, AA) and a frame area 102 located at the periphery of the display area 101. The display area 101 comprises a pixel array formed by a plurality of pixel units, and the pixel array comprises pixel rows extending in a first direction and pixel columns extending in a second direction.

[0044] The driving lines (such as gate driving lines, data lines, etc.) of the display area 101 are fanned out to the bending area 120 through the fan-out lines on the frame area 102, so that the bonding pads of the driving lines are bent to the backlight side of the main area 110, and then bonded to the circuit structure such as the chip on film, so as to realize narrow frame.

[0045] The bending area 120 of the display substrate 10 is provided with at least one first alignment mark 121 and an alignment window 122 corresponding to each first alignment mark 121. The main area 110 is provided with a second alignment mark 111 for alignment with each first alignment mark 121.

[0046] The alignment window 122 has a certain transparency, and its setting position corresponds to the position of the corresponding second alignment mark 111. Figure 5 A back view of a display module composed of the above display substrate 10 is shown. In the display module, the bending area 120 of the display substrate 10 is bent to the backlight side of the display substrate 10. As shown, Figure 5 From the backlight side of the display module, the second alignment mark 111 located below the alignment window 122 can be recognized through the alignment window 122. In this way, the setting position of the alignment mark is not affected by the shielding of the bending area 120 to the main area 110, so that a sufficient number of alignment marks can be set according to the width of the bending area 120 of the actual product, which is beneficial to improve the alignment accuracy during bending, increase the Pad Bending yield of medium and large size products, reduce the risk of wrinkles caused by bending, and reduce the display abnormality problem caused by the fracture of the bending area circuit.

[0047] It should be noted that if the first alignment mark 121, the alignment window 122 corresponding to the first alignment mark 121, and the second alignment mark 111 are considered as a set of alignment mark structures 200, then the display substrate 10 can be provided with one or more sets of the above-mentioned alignment mark structures 200 to adapt to the alignment requirements of the product. For example, when the product size is relatively large, in order to ensure alignment accuracy, the bending area 120 can be provided with multiple sets of the above-mentioned alignment mark structures 200 at intervals, such as... Figure 6 As shown. It should be noted that, Figure 6 The number of 200 alignment mark structures shown is for illustrative purposes only. The actual number of alignment mark structures 200 can be determined based on the actual product's bending area width of 120.

[0048] The first alignment mark 121, the second alignment mark 111, and the alignment window 122 can be designed into any applicable shape. For example, such as Figures 4-6 As shown, the first alignment mark 121 can be cross-shaped, the second alignment mark 111 can be T-shaped, and the alignment window 122 can be rectangular. Of course, in other examples, the alignment marks and the alignment window 122 can also be designed in other shapes, and this embodiment does not limit this. For example, the alignment window 122 can also be circular or the same shape as the second alignment mark 111, such as T-shaped.

[0049] The first alignment mark 121 and the second alignment mark 111 can be made of a material with high reflectivity, such as a metal, to facilitate identification. For example, to simplify the manufacturing process, the first alignment mark 121 and the second alignment mark 111 can be disposed on the same layer as a metal layer, such as a signal line metal layer, in the frame of the display substrate 10, and the relative position tolerance between the two can be kept as low as possible to ensure alignment accuracy.

[0050] To facilitate alignment, the alignment window 122 can be positioned close to the corresponding first alignment mark 121. To accommodate the second alignment mark 111 located on the border of the main body area 110, in some examples, when the bending area 120 is in an unbent state, the alignment window 122 is located on the side of the corresponding first alignment mark 121 closest to the main body area 110 (e.g., Figure 4 The center is located above the first alignment mark 121. It should be noted that after bending the bending area 120 to the backlight side, the relative position of the alignment window 122 and the corresponding first alignment mark 121 will be reversed (e.g., Figure 5 The alignment window 122 is located below the first alignment mark 121. In specific implementations, the relative positions of the alignment window 122 and the first alignment mark 121 can be determined according to the needs of the actual product. For example, besides… Figure 4 In addition to the positional relationship shown in the diagram, the alignment window 122 can also be located on the upper left or upper right side of the corresponding first alignment mark 121. This embodiment does not impose any restrictions on this.

[0051] The positional relationship between the alignment window 122 and the second alignment mark 111 needs to satisfy: when the bending area 120 is bent to the backlight side of the main body area 110, the orthographic projection of the second alignment mark 111 on the flexible substrate 100 of the main body area 110 at least partially overlaps with the orthographic projection of the corresponding alignment window 122 on the flexible substrate 100 of the main body area 110, so that when the bending of the bending area 120 is aligned by the first alignment mark 121 and the corresponding second alignment mark 111, the corresponding second alignment mark 111 can be recognized through the alignment window 122.

[0052] For example, as shown in FIG. 2A, the orthographic projection of the alignment window 122 on the flexible substrate 100 of the main body area 110 is a first projection area 210, and the orthographic projection of the corresponding second alignment mark 111 of the alignment window 122 on the flexible substrate 100 of the main body area 110 is a second projection area 220, and the second projection area 220 is located within the first projection area 210. Further, in order to improve the recognition resolution of the second alignment mark 111, the size of the alignment window 122 can be greater than the size of the second alignment mark 111, so that the edge 202 of the second projection area 220 and the edge 201 of the first projection area 210 have a gap 203. In this way, when the second alignment mark 111 is recognized through the alignment window 122, the insulating material around the second alignment mark 111 can also be recognized, and the recognition accuracy is improved by using the contrast difference between the second alignment mark 111 and the surrounding insulating material. Figure 7 In some examples, as shown in FIG. 2B, the bending area 120 of the display substrate 10 can include: a first area 120a, a second area 120b and a third area 120c arranged along a first direction (such as the x-axis direction shown in FIG. 2B). Among them, the second area 120b is located between the first area 120a and the third area 120c. The first direction is the width direction of the bending area 120, and the first direction is parallel to the pixel row direction of the display substrate 10.

[0053] Figure 8 Correspondingly, the side frame area of the main body area 110 close to the bending area 120 can include: a first corner area close to the first area 120a, a second corner area close to the third area 120c, and a transition area located between the first corner area and the second corner area. When the bending area 120 is bent to the backlight side of the main body area 110, the above-mentioned transition area will be covered by the bending area 120. Figure 8

[0054]

[0055] ​​​At this time, the at least one first alignment mark 121 and the alignment window 122 corresponding to each first alignment mark 121 can be located in the second region 120b, i.e., in the middle region of the bending region 120, and the second alignment mark 111 is located in the transition region, so as to ensure the alignment accuracy of the middle region of the bending region 120 and reduce display abnormalities caused by wrinkles and other defects in the middle region.

[0056] On this basis, the first region 120a and / or the third region 120c can be provided with a third alignment mark 123, and the first corner region and / or the second corner region are correspondingly provided with a fourth alignment mark 112 for alignment with the third alignment mark 123. For example, the third alignment mark 123 can be arranged on the left and right sides of the bending region 120, i.e., the first region 120a and the third region 120c, as shown in FIG. 8, or only the first region is provided with the third alignment mark 123, or only the third region is provided with the third alignment mark 123. Compared with the alignment mark structure 200 used in each region of the bending region 120, this design can reduce the alignment design difficulty of the first region 120a and the third region 120c, and minimize the number of alignment windows 122 required by the bending region 120, thereby reducing the impact of the alignment mark design on the bending region 120. Figure 8

[0057] It should be noted that the shape and size of the first alignment mark 121 and the third alignment mark 123 can be the same, and the names "first" and "third" in this article are only for easy distinction. The shape and size of the second alignment mark 111 and the fourth alignment mark 112 can be the same, and the names "second" and "fourth" in this article are only for easy distinction. For example, in the specific production process, the first alignment mark 121, the second alignment mark 111, the third alignment mark 123, and the fourth alignment mark 112 can be arranged in the same layer using a metal material.

[0058] The bending region 120 of the display substrate 10 includes a signal line metal layer arranged in layers on the flexible substrate 100. The signal line metal layer is provided with signal traces for leading out the fan-out lines of the above-mentioned bezel region to the corresponding connection end. Since the signal line metal layer has high reflectivity, in order to make the alignment window 122 have a certain transparency, at least the signal line metal layer is arranged outside the alignment window 122.

[0059] Specifically, there are various embodiments of the alignment window 122, and two structures are mainly listed below for example. In other examples, other embodiments can also be used, and the present embodiment does not limit this.

[0060] The first kind, as shown in FIG. 9, is to arrange the signal line metal layer 130 in the form of a ring around the alignment window 122. Figure 9 ​As shown, considering that the film layer structure of the bending area 120 is relatively simple, except for the signal line metal layer, the other film layers such as the flexible substrate 100 base material have relatively high transmittance, the signal line metal layer with relatively strong reflectivity in the bending area 120 can be avoided to form the alignment window 122 at a predetermined alignment window 122 position. At this time, the film layers are reserved in the alignment window 122, for example, at least the flexible substrate 100 is reserved in the alignment window 122. In some examples, the transmittance of the alignment window 122 can be greater than or equal to 50%, to ensure that the alignment window is at least in a semi-transparent state, and the second alignment mark 111 of the main body area 110 can be recognized under strong light, so that alignment is performed. This alignment window structure does not need to be cut and punched, and does not need to reserve a cutting path and a crack dam around the alignment window, which is beneficial to reduce the influence of the added alignment window 122 on the wiring of the bending area 120.

[0061] For example, in a specific production process, the area in the bending area 120 that needs to be designed as the alignment window 122 can be determined in advance, and then the wiring of the bending area 120 is laid out on the signal line metal layer, and the area is avoided to form the alignment window 122 in the area.

[0062] In some examples, in order to make the alignment window 122 have relatively high transmittance, only the base material of the flexible substrate 100 such as a PI film can be reserved in the alignment window 122. It should be noted that the film layers of the bending area 120 can also be provided with other film layers such as a buffer layer, an insulating layer, etc. in addition to the base material of the flexible substrate 100 and the signal line metal layer. In other examples, in the case of meeting the transmittance requirement of the alignment window 122, other film layers with relatively high transmittance such as a buffer layer, etc. can also be reserved in the alignment window 122 in addition to the base material of the flexible substrate 100, and the present embodiment does not limit this.

[0063] Secondly, as shown in Figure 10 The depth of the through hole in the direction perpendicular to the flexible substrate 100 is equal to the thickness of the bending area 120, that is, the through hole penetrates the bending area 120 in the direction perpendicular to the flexible substrate 100. In this way, the alignment window 122 can have 100% transmittance, which is beneficial to improve the recognition accuracy of the second alignment mark 111, thereby improving the alignment accuracy. For example, in a specific production process, before the bending operation is performed on the bending area 120, a cutting path can be designed around the position of the alignment window 122, and a crack dam is reserved, and then the flexible substrate 100 at the position is cut off along the cutting path by laser cutting to form a hollow opening, that is, the above-mentioned through hole.

[0064] In some examples, such as Figure 11 As shown, the display module also includes a back film 11 disposed on the backlight side of the display substrate 10. To further improve the recognition accuracy of the second alignment mark 111, in some examples, the back film 11 is provided with a cutout opening 1101 directly opposite the alignment window 122. The orthographic projection of the cutout opening 1101 on the flexible substrate 100 at least partially overlaps with the orthographic projection of the alignment window 122 on the flexible substrate 100. For example, the orthographic projections of the cutout opening 1101 and the alignment window 122 on the flexible substrate 100 may coincide.

[0065] It should be noted that, since the bending area 120 of the display substrate 10 bends to the backlight side of the main body area 110, in some examples, in addition to the area in the bending state, a back film 11 is provided on the backlight side of the main body area 110 and on the side of the bending area 120 near the main body area 110. In this case, a cutout opening 1101 facing the alignment window 122 can be provided on the back film 11 on the side of the bending area 120 near the main body area 110, and / or, a cutout opening facing the alignment window 122 can be provided on the back film 11 on the backlight side of the main body area 110.

[0066] For example, such as Figure 9 As shown, based on the first alignment window 122 structure described above, the aforementioned hollow opening 1101 can be provided only on the back film 11 located on the side of the bending area 120 near the main body area 110. This is beneficial to improve the recognition accuracy of the second alignment mark 111 while saving the processing cost of opening the hollow opening 1101 on the back film 11 of the main body area 110.

[0067] For example, such as Figure 10 As shown, when the second alignment window 122 structure described above is adopted, considering that the alignment window 122 already has 100% transmittance, and the material of the back film 11 itself also has high transmittance, it is not necessary to set a cutout opening 1101 on the back film 11 at the position directly opposite the alignment window 122, while meeting the recognition accuracy requirements, thus reducing processing costs. Of course, in other examples, the cutout opening 1101 can also be set in the back film 11 at the position directly opposite the alignment window 122, based on the second alignment window 122 structure described above. The specific setting can be determined according to actual needs, and this embodiment does not impose any restrictions on this.

[0068] Furthermore, such as Figures 9-11As shown, the display module can further include a heat dissipation film 12 disposed on the backlight side of the main body area 110. For example, the heat dissipation film 12 can be a Super Clean Foam (SCF) composite film. The SCF composite film can buffer the stress acting on the display substrate 10 and dissipate the heat generated when the display substrate 10 is working, thereby protecting the display substrate 10 to a certain extent. As shown in FIG. 1B, the heat dissipation film 12 is provided with an opening 1201 opposite the second alignment mark 111 of the main body area 110, so as to expose the second alignment mark 111 and facilitate positioning and identification. Of course, if the main body area 110 is also provided with the fourth alignment mark 112, the heat dissipation film 12 is also provided with an opening 1201 opposite the fourth alignment mark 112, so as to expose the fourth alignment mark 112. Figure 11 As shown in FIG. 1B, the heat dissipation film 12 is provided with an opening 1201 opposite the second alignment mark 111 of the main body area 110, so as to expose the second alignment mark 111 and facilitate positioning and identification. Of course, if the main body area 110 is also provided with the fourth alignment mark 112, the heat dissipation film 12 is also provided with an opening 1201 opposite the fourth alignment mark 112, so as to expose the fourth alignment mark 112.

[0069] In some examples, the display module can further include a bending spacer 13 disposed between the heat dissipation film 12 and the back film 11 of the bending area 120.

[0070] In some examples, the display module can further include a protective layer 17 disposed on the area of the display substrate 10 in the bending state, so as to protect the bending area. For example, the protective layer 17 can be a Metal Cover Layer (MCL) adhesive.

[0071] In some examples, the light-emitting side of the display module can further include a polarizer 14 (POL), an optically clear adhesive layer 15 (OCA) and a cover glass 16 (CG) which are sequentially stacked on the display substrate 10.

[0072] An embodiment of the present disclosure further provides a display device, which includes the display module provided in the above embodiments. For example, the display device can be a display screen, a mobile phone, a notebook computer, a tablet computer, a television, a digital photo frame or any product or component having a display function.

[0073] It should be noted that each of the embodiments provided by the present disclosure is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0074] In the above description, the technical details such as the configuration of each layer of the product are not described in detail. However, those skilled in the art should understand that the layers, regions and the like with the required shape can be formed by various technical means. In addition, those skilled in the art can also design methods that are not exactly the same as the above-described methods in order to form the same structure. Although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used advantageously in combination.

[0075] In addition, those skilled in the art should understand that the discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the disclosure is limited to these examples; the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of one or more embodiments of the disclosure as described above. In order to be brief, they are not provided in detail.

[0076] Although the preferred embodiments of the disclosure have been described, those skilled in the art can make further changes and modifications to these embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the disclosure.

Claims

1. A display substrate comprising a flexible substrate, characterized by, The display substrate comprises a main area and a bending area on one side of the main area, the bending area is provided with at least one first alignment mark and an alignment window corresponding to each first alignment mark; The bending area comprises a signal line metal layer stacked on the flexible substrate, and the signal line metal layer is arranged outside the alignment window; The main area is provided with a second alignment mark for alignment with each first alignment mark, when the bending area is bent to the backlight side of the main area, the orthographic projection of the second alignment mark on the flexible substrate of the main area at least partially overlaps with the orthographic projection of the corresponding alignment window on the flexible substrate of the main area, so as to identify the second alignment mark through the alignment window; The bending area comprises a first area, a second area and a third area arranged along a first direction, the second area is located between the first area and the third area, the first direction is parallel to the pixel row direction of the display substrate, the main area comprises a display area and a frame area located at the periphery of the display area, the frame area close to one side of the bending area comprises a first corner area close to the first area, a second corner area close to the third area and a transition area located between the first corner area and the second corner area, when the bending area is bent to the backlight side of the main area, the transition area is covered by the bending area, the at least one first alignment mark and the alignment window corresponding to each first alignment mark are located in the second area, and the second alignment mark is arranged in the transition area; The first area is provided with a third alignment mark, and the first corner area is correspondingly provided with a fourth alignment mark for alignment with the third alignment mark; and / or, the second area is provided with a third alignment mark, and the second corner area is correspondingly provided with a fourth alignment mark for alignment with the third alignment mark; The orthographic projection of the alignment window on the flexible substrate of the main area is a first projection area, the orthographic projection of the second alignment mark corresponding to the alignment window on the flexible substrate of the main area is a second projection area, the second projection area is located in the first projection area, the size of the alignment window is greater than the size of the second alignment mark, and the edge of the second projection area has a gap with the edge of the first projection area.

2. The display substrate of claim 1, wherein, A through hole is formed at the position of the alignment window, and the depth of the through hole is equal to the thickness of the bending area in the direction perpendicular to the flexible substrate.

3. The display substrate of claim 1, wherein, The alignment window at least retains the flexible substrate, and the transmittance of the alignment window is greater than or equal to 50%.

4. A display module, characterized by Comprise: The display substrate of any one of claims 1-3, the bending area of the display substrate is bent to the backlight side of the main area.

5. The display module of claim 4, wherein, Further comprise: A back film is arranged on the backlight side of the display substrate, and a hollow opening opposite to the alignment window is arranged in the back film.

6. The display module of claim 4, wherein, Further comprise: A heat dissipation film is arranged on the backlight side of the main area, and the heat dissipation film is provided with an opening opposite to the second alignment mark of the main area to expose the second alignment mark.

7. A display device, characterized by comprising: Comprise: The display module of any one of claims 4-6.

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