Display substrate, preparation method thereof and display module

Abstract

The embodiment of the invention discloses a display substrate, a preparation method thereof and a display module. The display substrate comprises a substrate body and a functional film layer arranged on the substrate body, the display substrate comprises a display area and a frame area surrounding the display area, the frame area comprises at least one section of arc-shaped edge, and at least one marking part located in the frame area is arranged on the inner side of the arc-shaped edge. The marking part comprises an arc-shaped marking line or a plurality of marks, the arc-shaped marking line is parallel to the arc-shaped edge, and an arc-shaped connecting line formed by the plurality of marks is parallel to the arc-shaped edge. According to the mark design, the accuracy of alignment and accuracy confirmation of the grinding process in the preparation process of the display substrate is improved, and therefore the accuracy of the appearance of the ground display substrate is guaranteed.

Description

Technical Field

[0001] This disclosure relates to the field of display technology. More specifically, it relates to a display substrate and its fabrication method, and a display module. Background Technology

[0002] With the development of display technologies such as Active Matrix Organic Light Emitting Diode (AMOLED), the performance requirements for display products are becoming increasingly stringent. For example, medium to large-sized display products typically use rigid substrates such as glass combined with flexible packaging, requiring rigid cutting and grinding processes on the display substrate during manufacturing. For traditional display substrates with right-angled edges (i.e., right-angled corners), high-precision grinding is relatively easy to achieve.

[0003] Currently, in order to improve the appearance and reduce the problem of easy breakage from impacts, the corners of the display substrate are usually designed to be rounded, that is, the edges of the display substrate include arc edges. Furthermore, there is also a design with varying curvature radii of the arc edges, that is, the arc edges include at least two arc edge segments with different curvature radii. In this case, it is difficult to guarantee the precision of grinding, resulting in a large difference between the shape of the ground display substrate and the design, poor appearance, and is not conducive to subsequent display module bonding processes such as adhesive coating. Summary of the Invention

[0004] The purpose of this disclosure is to provide a display substrate and its preparation method, as well as a display module, to solve at least one of the problems existing in the prior art.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solution: The first aspect of this disclosure provides a display substrate, including a substrate and a functional film layer disposed on the substrate. The display substrate includes a display area and a border area surrounding the display area. The border area includes at least one arcuate edge. At least one marking portion located in the border area is disposed on the inner side of the arcuate edge. The marking portion includes an arcuate marking line or multiple markings. The arcuate marking line is parallel to the arcuate edge, and the arcuate connecting line formed by the multiple markings is parallel to the arcuate edge.

[0006] Optionally, a plurality of marking portions are provided on the inner side of the arc-shaped edge, each marking portion being located in a different functional film layer and the orthographic projection of each marking portion on the substrate having a non-overlapping region.

[0007] Optionally, among the plurality of marking portions, at least one marking portion includes an arc-shaped marking line, and at least one marking portion includes a plurality of markings.

[0008] Optionally, at least two of the plurality of marking portions include arc-shaped marking lines.

[0009] Optionally, among the plurality of marking portions, at least two marking portions include a plurality of markings, and the markings included in different marking portions have different shapes.

[0010] Optionally, the functional film layer includes a driving circuit layer, which includes an active layer, a dielectric layer, at least one gate layer, and at least one gate insulating layer, and the marking portion is disposed in the same layer as the active layer or the gate layer.

[0011] Optionally, the arcuate edge includes at least two arcuate edge segments with different radii of curvature.

[0012] Optionally, the border area includes multiple arc-shaped edges.

[0013] A second aspect of this disclosure provides a display module, including the display substrate provided in the first aspect of this disclosure.

[0014] A third aspect of this disclosure provides a method for preparing a display substrate, comprising: A functional film layer is prepared on a substrate, wherein the functional film layer includes a display area of ​​a display substrate and a border area surrounding the display area. The border area includes at least one arc-shaped edge, and at least one marking portion located in the border area is provided on the inner side of the arc-shaped edge. The marking portion includes an arc-shaped marking line or multiple markings. The arc-shaped marking line is parallel to the arc-shaped edge, and the arc-shaped connecting line formed by the multiple markings is parallel to the arc-shaped edge. The display substrate is obtained by sequentially performing cutting and grinding processes.

[0015] The beneficial effects of this disclosure are as follows: The marking design disclosed herein helps improve the accuracy of alignment and precision confirmation during the grinding process in the fabrication of display substrates, thereby ensuring the accuracy of the shape of the polished display substrate and ensuring that the appearance of the polished display substrate conforms to the design. This marking design is applicable to display substrates with curved edges, especially when a curved edge includes at least two curved edge segments with different radii of curvature. Attached Figure Description

[0016] The specific embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0017] Figure 1 This diagram illustrates the distribution of markings on a display substrate in related technologies.

[0018] Figure 2 Show Figure 1 The diagram shows the grinding deviation of the display substrate.

[0019] Figure 3 This diagram illustrates the distribution of marking portions on a display substrate provided in an embodiment of the present disclosure.

[0020] Figure 4 This diagram illustrates the distribution of another marking portion on a display substrate provided in an embodiment of the present disclosure.

[0021] Figure 5 This diagram illustrates the distribution of another marking portion on a display substrate provided in an embodiment of the present disclosure.

[0022] Figure 6 This diagram illustrates the distribution of another marking portion on a display substrate provided in an embodiment of the present disclosure.

[0023] Figure 7 This diagram illustrates the distribution of another marking portion on a display substrate provided in an embodiment of the present disclosure.

[0024] Figure 8 This diagram shows a cross-sectional view of a display substrate provided in an embodiment of the present disclosure.

[0025] Figure 9 This diagram shows another cross-sectional view of the display substrate provided in an embodiment of the present disclosure. Detailed Implementation

[0026] The terms “on”, “formed on”, and “set on” used in this disclosure can indicate that one layer is directly formed or set on another layer, or that one layer is indirectly formed or set on another layer, meaning that there are other layers between the two layers.

[0027] It should be noted that although the terms "first," "second," etc., may be used herein to describe various components, members, elements, regions, layers, and / or parts, these components, members, elements, regions, layers, and / or parts should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer, and / or part from another. Thus, for example, the first component, first member, first element, first region, first layer, and / or first part discussed below may be referred to as a second component, second member, second element, second region, second layer, and / or second part without departing from the teachings of this disclosure.

[0028] In this disclosure, unless otherwise stated, the term "co-layer arrangement" means that two layers, components, members, elements, or portions can be formed by the same fabrication process (e.g., patterning process), and that the two layers, components, members, elements, or portions are generally formed of the same material. For example, co-layer arrangement of two or more functional layers means that these co-layer functional layers can be formed using the same material layer and the same fabrication process, thereby simplifying the fabrication process of the display substrate.

[0029] In this disclosure, unless otherwise stated, the term "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping. The term "one-step patterning process" refers to a process that uses a photomask to form patterned layers, components, or parts.

[0030] In this disclosure, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description of this disclosure and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately changed depending on the direction in which each constituent element is described. Therefore, the use of terms not limited to those described in this disclosure may be appropriately replaced as appropriate.

[0031] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the specific meaning of these terms in this disclosure based on the specific circumstances.

[0032] In this disclosure, "parallel" can be broadly defined as the state in which two straight lines form an angle of -10° or more and less than 10°, and therefore also includes the state in which the angle is -5° or more and less than 5°. In addition, "perpendicular" can be broadly defined as the state in which two straight lines form an angle of 80° or more and less than 100°, and therefore also includes the state in which the angle is 85° or more and less than 95°.

[0033] In this disclosure, triangles, rectangles, trapezoids, pentagons, or hexagons are not strictly defined, but can be approximate triangles, rectangles, trapezoids, pentagons, or hexagons. Small deformations due to tolerances are possible, and chamfers, curved edges, and other deformations are possible.

[0034] In this disclosure, “about” means a value that is not strictly limited and allows for process and measurement errors.

[0035] Currently, in order to improve the appearance and reduce the problem of easy breakage from impacts, the corners of the display substrate are usually designed to be rounded, that is, the edges of the display substrate include arc edges. Furthermore, there is also a design with varying curvature radii of the arc edges, that is, the arc edges include at least two arc edge segments with different curvature radii. In this case, it is difficult to guarantee the precision of grinding, resulting in a large difference between the shape of the ground display substrate and the design, poor appearance, and is not conducive to subsequent display module bonding processes such as adhesive coating.

[0036] Taking an OLED display substrate as an example, in the manufacturing process of a display substrate with curved edges, after the functional film layers including a driving circuit layer, a light-emitting functional layer, and an encapsulation layer are prepared on the substrate, a cutting process, such as laser cutting, is performed. A laser beam is used to cut along the cutting path to cut out the approximate outline of the display substrate. After the cutting process, a polishing process is performed. Based on a vision alignment system, such as a CCD camera, the position of a mark set on the display substrate is read to align the polishing device with the display substrate. The edges of the display substrate are polished using a rotating polishing wheel of the polishing device to obtain smooth and flat edges of the display substrate.

[0037] Marker design in related technologies, such as Figure 1 As shown, for example, a display substrate with rounded corners includes four arc-shaped edges located at the four corners, and a mark 101 is provided on the inner side of each arc-shaped edge. The inventors discovered that this mark design can only partially satisfy the initial alignment of the grinding device and the display substrate, and when issues arise... Figure 2 When there is a deviation between the grinding curve 201 shown and the preset curve 202, this marking design cannot achieve real-time adjustment of the grinding path during grinding, cannot guarantee the accuracy of alignment during grinding, and cannot confirm the accuracy of the marking after grinding to verify whether the curved edge conforms to the design. Especially for a curved edge that includes at least two curved edge segments with different radii of curvature, this marking design cannot guarantee the accuracy of the display substrate shape.

[0038] In view of the above, one embodiment of the present disclosure provides a display substrate, including a substrate and a functional film layer disposed on the substrate. The display substrate includes a display area and a border area surrounding the display area. The border area includes at least one arcuate edge. At least one marking portion located in the border area is disposed on the inner side of the arcuate edge. The marking portion includes an arcuate marking line or multiple markings. The arcuate marking line is parallel to the arcuate edge, and the arcuate connecting line formed by the multiple markings is parallel to the arcuate edge.

[0039] The marking design of the display substrate provided in this embodiment is beneficial to improving the accuracy of alignment and precision confirmation during the grinding process in the manufacturing of the display substrate. Specifically, by providing at least one marking portion, including one or more arc-shaped marking lines, for each segment of the arc-shaped edge, more precise initial alignment of the grinding device and the display substrate to be ground can be achieved. Furthermore, during grinding, the grinding path can be adjusted and compensated in real time based on the arc-shaped marking lines and / or multiple markings to ensure the accuracy of alignment during grinding. This avoids positional deviations caused by translational or rotational deviations of the grinding device or display substrate during grinding, or wear and deformation of the grinding wheel or tilting of the grinding shaft. Additionally, it allows for precise confirmation of grinding precision after grinding based on the arc-shaped marking lines and / or multiple markings. In summary, the marking design of the display substrate provided in this embodiment ensures the accuracy of the shape of the display substrate after grinding, guaranteeing that the appearance of the ground display substrate matches the design. The marking design of the display substrate provided in this embodiment is applicable to display substrates with arc-shaped edges, particularly when one arc-shaped edge includes at least two arc-shaped edge segments with different radii of curvature.

[0040] Understandably, taking the parallelism of the arc-shaped marking line to the arc-shaped edge as an example, the aforementioned parallelism means that the arc-shaped marking line and the arc-shaped edge are parallel curves or equidistant lines, that is, the distance between the arc-shaped marking line and the arc-shaped edge is equal or constant. The design of the arc-shaped marking line being parallel to the arc-shaped edge allows the arc-shaped marking line to more accurately reflect the design outline of the arc-shaped edge, making alignment during the grinding process easier and improving the accuracy of alignment and precision confirmation in the grinding process during the manufacturing of the display substrate.

[0041] In a specific example, such as Figure 3 As shown, the corners of the display substrate provided in this embodiment are rounded. The display substrate includes a display area located in the central region and a border area located in the edge region surrounding the display area. The border area includes four arc-shaped edges located at the four corners. In this example, a marking portion located in the border area is provided on the inner side of each of the four arc-shaped edges, and each marking portion includes multiple marks 301. The arc-shaped connecting line of the multiple marks 301 in each marking portion is parallel to the corresponding arc-shaped edge, for example... Figure 3 As shown, the arc-shaped line connecting the four marks 301 in the upper left corner is parallel to the arc-shaped edge of the upper left corner, and the arc-shaped line connecting the four marks 301 in the lower right corner is parallel to the arc-shaped edge of the lower right corner. It should be noted that... Figure 3 The four marker sections located at the top left, bottom left, top right, and bottom right corners respectively comprise a total of sixteen markers 301. To avoid affecting the display of the distribution shape of the markers 301, Figure 3 Only one marker, 301, is labeled in the diagram, and the same applies to subsequent diagrams.

[0042] It should be noted that, Figure 3 As shown, each marking part includes four markings 301, but this disclosure is not limited to this. The marking part may also include two or three markings, or the marking part may include more markings in order to further improve the accuracy of alignment and precision confirmation of the grinding process.

[0043] In a specific example, with Figure 3 The design shown is different, such as Figure 4 In the example shown, a marking part is provided on the inner side of each of the four arc-shaped edges, including an arc-shaped marking line 401, which is parallel to the corresponding arc-shaped edge.

[0044] It should be noted that, Figure 3 and Figure 4 As shown, the design of the markings corresponding to multiple curved edges is the same, for example... Figure 3 The markings corresponding to the four curved edges shown all include four markings 301. Figure 4 The marking portions corresponding to the four curved edges shown all include curved marking lines 401. However, this disclosure is not limited to this. Some marking portions corresponding to curved edges may include multiple markings, while others may include curved marking lines. For example, the marking portions corresponding to the upper left and upper right curved edges may include curved marking lines, while the marking portions corresponding to the lower left and lower right curved edges may include multiple markings, and so on. Furthermore, the shape and size of the markings in the marking portions corresponding to different curved edges may be designed to be different, and the width and color of the curved marking lines in the marking portions corresponding to different curved edges may be designed to be different. In this way, a vision alignment system based on, for example, a CCD camera, can identify which location of the curved edge in the display substrate it belongs to based on the different markings or the style of the curved marking lines.

[0045] The display substrate provided in this embodiment includes various types, which can be selected and set according to actual needs. For example, it can be an organic light-emitting diode (OLED) display substrate, a quantum dot light-emitting diode (QLED) display substrate, or a mini / micro light-emitting display (MLED) display substrate, etc. The OLED display substrate can be an AMOLED display substrate, etc. This embodiment does not make specific limitations here.

[0046] The following description uses the above-mentioned display substrate as an OLED display substrate as an example to illustrate the display substrate provided in the embodiments of this disclosure. However, the implementation of this disclosure is not limited to this, and any other display substrate can be considered as long as the same technical concept is applied.

[0047] In one possible implementation, the border area includes multiple curved edges.

[0048] Continuing with the previous example, for example Figure 3 and Figure 4 As shown, the display substrate provided in this embodiment is a display substrate with rounded corners, including four arc-shaped edges located at the four corners, and a marking portion is provided on the inner side of each arc-shaped edge.

[0049] In one possible implementation, the arcuate edge comprises at least two arcuate edge segments with different radii of curvature.

[0050] Continuing with the previous example, for example Figure 3 and Figure 4 As shown, the display substrate has four segments located in the arc-shaped edges at the four corners. The arc-shaped edges at the upper left and upper right corners each include three arc-shaped edge segments with different radii of curvature. That is, the arc-shaped edges at the upper left and upper right corners are three-segment arc-shaped edges, while the arc-shaped edges at the lower left and lower right corners have the same radius of curvature. It should be noted that this disclosure is not limited to this. Depending on the requirements, all four arc-shaped edges may include multiple arc-shaped edge segments with different radii of curvature, or only the arc-shaped edges at the lower left and lower right corners may include multiple arc-shaped edge segments with different radii of curvature.

[0051] It should be noted that for arc-shaped edges comprising multiple segments with varying radii of curvature, where the corresponding marking portion includes multiple marks, a design should be adopted where each arc-shaped edge segment corresponds to at least one mark to ensure the accuracy of alignment and precision confirmation during the grinding process. Furthermore, although... Figure 3 Not shown, but a design with at least two marks corresponding to each arc-shaped edge segment can be adopted to further ensure the accuracy of alignment and precision confirmation in the grinding process.

[0052] In one possible implementation, a plurality of marking portions are provided on the inner side of the arc-shaped edge, each marking portion being located in a different functional film layer and the orthographic projection of each marking portion on the substrate having a non-overlapping region.

[0053] This design, which sets multiple marks along the thickness direction of the display substrate, facilitates the detection of grinding deviations caused by factors such as grinding shaft tilt during the grinding process, thereby further improving the accuracy of alignment and precision confirmation in the grinding process. Furthermore, the design where the orthogonal projections of different marks along the thickness direction corresponding to a segment of the arc edge have non-overlapping areas on the substrate facilitates the reading of mark positions using a visual alignment system based on, for example, a CCD camera.

[0054] In one possible implementation, at least one of the plurality of marking portions includes an arc-shaped marking line, and at least one marking portion includes a plurality of markings.

[0055] In a specific example, with Figure 3 The design shown is different, such as Figure 5 In the example shown, two marking portions are respectively provided on the inner sides of the four arc-shaped edges. One marking portion includes an arc-shaped marking line 401, and the other marking portion includes multiple marks 301. The arc-shaped marking line 401 is parallel to the corresponding arc-shaped edge, and the arc-shaped connecting line of the multiple marks 301 is also parallel to the corresponding arc-shaped edge. Figure 5 As shown, the orthographic projections of multiple marks 301 and arc-shaped mark lines 401 onto the substrate do not overlap, i.e., from... Figure 5 From a top-down view, there is no overlap between the multiple markings 301 and the arc-shaped marking line 401.

[0056] In one possible implementation, at least two of the plurality of marking portions include a plurality of markings, and the markings included in different marking portions have different shapes.

[0057] In a specific example, with Figure 3 The design shown is different, such as Figure 6 In the example shown, two marking sections are respectively set on the inner sides of the four curved edges. One marking section includes multiple T-shaped marks 301, and the other marking section includes multiple figure-eight marks 302. The design of different mark shapes in the multiple marking sections corresponding to a single curved edge makes it easier for a visual alignment system based on, for example, a CCD camera to read the position of the marks in different marking sections. The arc connecting the multiple T-shaped marks 301 is parallel to the corresponding curved edge, and the arc connecting the multiple figure-eight marks 302 is also parallel to the corresponding curved edge. Figure 6 As shown, the orthographic projections of the plurality of T-shaped marks 301 and the plurality of figure-eight marks 302 on the substrate do not overlap. It should be noted that the shape of the marks in this disclosure is not limited to... Figure 3 , Figure 5 , Figure 6 The T-shape and figure-eight shape shown can also be other shapes such as cross, I-shape, triangle, rectangle, and circle.

[0058] In one possible implementation, at least two of the plurality of marking portions include arc-shaped marking lines.

[0059] In a specific example, with Figure 4 The design shown is different, such as Figure 7 In the example shown, two marking portions are respectively provided on the inner sides of the four arc-shaped edges. One marking portion includes an arc-shaped marking line 401, and the other marking portion includes an arc-shaped marking line 402. Arc-shaped marking lines 401 and 402 are parallel to their respective arc-shaped edges. Arc-shaped marking line 402 is closer to the substrate than arc-shaped marking line 401, and the width of arc-shaped marking line 402 is greater than the width of arc-shaped marking line 401. Therefore, Figure 7 As shown, although the centers of the arc-shaped marking line 401 and the arc-shaped marking line 402 roughly coincide, since the width of the arc-shaped marking line 402 is greater than the width of the arc-shaped marking line 401, there is a non-overlapping area in the orthographic projection of the arc-shaped marking line 401 and the arc-shaped marking line 402 on the substrate. From the top view, the arc-shaped marking line 401 will not obscure the arc-shaped marking line 402, thus preventing its edge from being read by a visual alignment system based on, for example, a CCD camera.

[0060] In one possible implementation, the functional film layer includes a driving circuit layer, which comprises an active layer, a dielectric layer, at least one gate layer, and at least one gate insulating layer. The marking portion is disposed on the same layer as the active layer or the gate layer. This simplifies the display substrate manufacturing process, saves costs, and ensures that the marking portion located in the bezel area and disposed on the same layer as the active layer or gate layer in the display area is not obscured by subsequently fabricated functional film layers such as high-transmittance gate insulating layers, dielectric layers, passivation layers, planarization layers, and encapsulation layers.

[0061] Continuing with the previous example, implement, for example Figure 5 or Figure 6 The design shown can employ one marker portion disposed on the same layer as the active layer, and another marker portion disposed on the same layer as the gate layer, for example... Figure 8 As shown, Figure 5 and Figure 6 The marker 301 shown is located on the same layer as the active layer 803. Figure 5 The arc-shaped marker line 401 shown Figure 6 The marker 302 shown is disposed on the same layer as gate 805. For example, implementation... Figure 7 The design shown can employ one marker portion disposed on the same layer as the active layer, and another marker portion disposed on the same layer as the gate layer, for example... Figure 9 As shown, Figure 7 The arc-shaped marker line 402 shown is disposed on the same layer as the active layer 803. Figure 7 The arc-shaped marker line 401 shown is disposed on the same layer as the gate 805.

[0062] The following is about Figure 8 and Figure 9 The functional film layers of the display substrate shown will be further explained.

[0063] Figure 8 and Figure 9 As shown, the right side of the dividing line is the display area (AA area) 890, and the left side is the border area 891.

[0064] For example Figure 8 and Figure 9 As shown, the OLED display substrate includes a substrate 801 and a driving circuit layer, a passivation layer (PVX) 808, a planarization layer (PLN) 809, a light-emitting functional layer, and a thin film encapsulation (TFE) 814 sequentially stacked on the substrate 801.

[0065] The substrate 801 is, for example, a rigid substrate made of materials such as glass or quartz.

[0066] The OLED display substrate may also include a barrier layer and a buffer layer 802 located between the substrate 801 and the driving circuit layer. For example, the barrier layer and buffer layer 802 may be formed over the entire surface of the substrate 801. For example, the barrier layer may be made of an inorganic insulating material such as silicon oxide, silicon nitride, or silicon oxynitride, and the buffer layer 802 may also be made of an inorganic insulating material such as silicon oxide, silicon nitride, or silicon oxynitride. The barrier layer helps to prevent water and oxygen from entering the OLED from the bottom. The buffer layer 802 improves the quality of subsequent material deposition.

[0067] The driving circuit layer, also known as the thin film transistor (TFT) layer, includes an active layer 803 formed on the buffer layer 802 using a patterning process, a gate insulating layer (GI) 804 formed on the active layer 803 by deposition or other methods, a gate of the thin film transistor 805 formed on the gate insulating layer 804 using a patterning process, an interlayer dielectric (ILD) 806 formed on the gate 805 by deposition or other methods, and a source / drain metal layer (SD) 807 formed on the dielectric layer 806. The active layer 803 includes a channel region and a first conductive region and a second conductive region located on both sides of the channel region, wherein the channel region retains semiconductor characteristics, and both the first and second conductive regions are conductive. The source and drain metal layers 807 form the source and drain of the thin-film transistor. For example, the gate is electrically connected to the scan line. The source and drain are electrically connected to the first and second conductive regions of the active layer 803 through vias in the dielectric layer 806, respectively. One of the source or drain is electrically connected to the data line, and the other is electrically connected to the anode 810 in the light-emitting functional layer. The dielectric layer 806 is formed, for example, across its entire surface. The active layer 803 can be made of materials such as polysilicon and metal oxides. The gate insulating layer 804 can be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride. The materials of the gate 805 and the source / drain metal layers 807 include metals or alloys such as aluminum, titanium, and cobalt, respectively.

[0068] In the bezel area 891 of the OLED display substrate, Figure 8 As shown, Figure 5 and Figure 6 The marker 301 shown is located on the same layer as the active layer 803. Figure 5 The arc-shaped marker line 401 shown Figure 6 The mark 302 shown is disposed on the same layer as the gate 805. Figure 9 As shown, Figure 7 The arc-shaped marker line 402 shown is disposed on the same layer as the active layer 803, and the arc-shaped marker line 401 is disposed on the same layer as the gate 805.

[0069] It is understood that the above-described thin-film transistor uses a top-gate structure as an example, but this disclosure is not limited thereto; bottom-gate structures are also included within the scope of this disclosure. Furthermore, Figure 8 and Figure 9Only one gate layer (i.e., the gate layer where gate 805 is located) and one gate insulating layer are shown, but this disclosure is not limited to this. This disclosure may also adopt a dual gate structure, that is, the display substrate includes two gate layers and two gate insulating layers. In this case, the two marking portions corresponding to the same arc edge can be respectively disposed in the same layer as the two gate layers.

[0070] The passivation layer 808 can be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride, which serves to isolate and protect the thin-film transistor area.

[0071] The planarization layer 809 is, for example, an organic material (e.g., resin Resin).

[0072] The light-emitting functional layer includes an anode 810, a pixel definition layer (PDL) 811, a light-emitting device layer 812, and a cathode (CTD) 813, wherein: The anode 810 is, for example, a metal oxide material such as ITO or IZO, and the anode 810 is electrically connected to the drain through a via penetrating the planarization layer 809 and the passivation layer 808.

[0073] The pixel defining layer 811 may be made of organic insulating materials such as negative photoresist, polyimide, and epoxy resin.

[0074] The light-emitting device layer 812 is formed on the anode 810 exposed by the opening in the pixel defining layer, forming the light-emitting area of ​​the sub-pixel. Figure 8 and Figure 9 The light-emitting device layer 812 shown includes an emitting layer (EML), for example... Figure 8 and Figure 9 As shown, different color sub-pixels have independent light-emitting layers. For example, red sub-pixels include red light-emitting layers, green sub-pixels include green light-emitting layers, and blue sub-pixels include blue light-emitting layers. The light-emitting device layer 812 may also include auxiliary light-emitting layers that facilitate the emission of the light-emitting layer. These auxiliary light-emitting layers may include one or more films selected from the following: a hole injection layer (HIL), a hole transport layer (HTL), an electron block layer (EBL), a hole block layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL). The light-emitting layer and the auxiliary light-emitting layer may be, for example, organic material layers.

[0075] The cathode 813 is formed over an entire surface, covering the light-emitting device layer 812 and the exposed pixel defining layer 811. The material of the cathode 813 may include metals such as Mg, Ca, Li or Al or their alloys, or metal oxides such as IZO or ZTO, or organic materials with conductive properties such as PEDOT / PSS (poly(3,4-ethylenedioxythiophene / polystyrene sulfonate)).

[0076] The encapsulation layer 814 is located on the cathode 813. For example, the encapsulation layer 814 includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. For example, the first and second inorganic encapsulation layers are formed by deposition or other methods. The organic encapsulation layer is formed by inkjet printing. For example, the first and second inorganic encapsulation layers can be formed using inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, while the organic encapsulation layer can be formed using organic materials such as polyimide (PI) and epoxy resin. Thus, the first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer form a composite encapsulation layer. This composite encapsulation layer can provide multiple layers of protection for the functional structure of the display substrate, resulting in better encapsulation performance.

[0077] Another embodiment of this disclosure provides a method for preparing a display substrate, comprising: A functional film layer is prepared on a substrate, wherein the functional film layer includes a display area of ​​a display substrate and a border area surrounding the display area. The border area includes at least one arc-shaped edge, and at least one marking portion located in the border area is provided on the inner side of the arc-shaped edge. The marking portion includes an arc-shaped marking line or multiple markings. The arc-shaped marking line is parallel to the arc-shaped edge, and the arc-shaped connecting line formed by the multiple markings is parallel to the arc-shaped edge. The display substrate is obtained by sequentially performing cutting and grinding processes.

[0078] refer to Figure 8 and Figure 9 As shown, the display substrate preparation method provided in this embodiment involves a cutting process and a grinding process after the encapsulation layer is fabricated. In the grinding process, the pre-fabricated marking portion is used for alignment and accuracy confirmation, which can effectively improve the accuracy of alignment and accuracy confirmation in the grinding process during the preparation of the display substrate. For details, please refer to the description of the foregoing embodiment, which will not be repeated here.

[0079] In addition, other necessary functional film layers can be formed in the display area and the bezel area as needed, such as storage capacitors in the display area. These functional film layers can be formed using conventional methods, which will not be elaborated here.

[0080] After the grinding process to obtain the display substrate, polarizer attachment, bonding, and cover plate (e.g., glass cover plate) bonding processes can be carried out to obtain the display module. Finally, testing can be performed.

[0081] It should be noted that the marking design and use in the display substrate preparation method provided in this embodiment have been described in the description of the display substrate provided in the foregoing embodiment. The relevant parts can be referred to in the foregoing embodiment, and will not be repeated here.

[0082] Another embodiment of this disclosure provides a display module, including the display substrate provided in the above embodiments. The display module can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator; this embodiment does not limit its application to this.

[0083] Obviously, the above embodiments of this disclosure are merely examples for clearly illustrating this disclosure, and are not intended to limit the implementation of this disclosure. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all implementation methods here. Any obvious variations or modifications derived from the technical solutions of this disclosure are still within the protection scope of this disclosure.

Claims

1. A display substrate, comprising a substrate and a functional film layer disposed on the substrate, characterized in that, The display substrate includes a display area and a border area surrounding the display area. The border area includes at least one arc-shaped edge. At least one marking portion located in the border area is provided on the inner side of the arc-shaped edge. The marking portion includes an arc-shaped marking line or multiple markings. The arc-shaped marking line is parallel to the arc-shaped edge, and the arc-shaped connecting line formed by the multiple markings is parallel to the arc-shaped edge.

2. The display substrate according to claim 1, characterized in that, Multiple marking portions are provided on the inner side of the arc-shaped edge. Each marking portion is located in a different functional film layer, and the orthogonal projection of each marking portion on the substrate has a non-overlapping area.

3. The display substrate according to claim 2, characterized in that, Of the plurality of marking portions, at least one marking portion includes an arc-shaped marking line, and at least one marking portion includes a plurality of markings.

4. The display substrate according to claim 2, characterized in that, Of the plurality of marking portions, at least two marking portions include arc-shaped marking lines, and the widths of the arc-shaped marking lines included in different marking portions are different.

5. The display substrate according to claim 2, characterized in that, Of the plurality of marking portions, at least two marking portions include a plurality of markings.

6. The display substrate according to any one of claims 1-5, characterized in that, The functional film layer includes a driving circuit layer, which includes an active layer, a dielectric layer, at least one gate layer, and at least one gate insulating layer. The marking portion is disposed in the same layer as the active layer or the gate layer.

7. The display substrate according to claim 1, characterized in that, The arc-shaped edge includes at least two arc-shaped edge segments with different radii of curvature.

8. The display substrate according to claim 1, characterized in that, The border area includes multiple curved edges.

9. A display module, characterized in that, The display substrate includes any one of claims 1-8.

10. A method for preparing a display substrate, characterized in that, include: A functional film layer is prepared on a substrate, wherein the functional film layer includes a display area of ​​a display substrate and a border area surrounding the display area. The border area includes at least one arc-shaped edge, and at least one marking portion located in the border area is provided on the inner side of the arc-shaped edge. The marking portion includes an arc-shaped marking line or multiple markings. The arc-shaped marking line is parallel to the arc-shaped edge, and the arc-shaped connecting line formed by the multiple markings is parallel to the arc-shaped edge. The display substrate is obtained by sequentially performing cutting and grinding processes.

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