Display substrate, preparation method thereof and display device

Abstract

The invention provides a display substrate, a preparation method thereof and a display device. The display substrate comprises a substrate; the driving layer is arranged on the substrate, the driving layer comprises at least two driving chips and a signal wire for connecting two adjacent driving chips, and the signal wire comprises a first area and a second area; the protection layer is arranged on the driving layer and comprises a first protection area, the first protection area covers the second area, a first edge groove is formed in the first protection area and is close to the edge of the first protection area, and the edge of the first protection area is fuzzified in the exposure process due to the existence of the first edge groove, so that the exposure is more uniform; according to the embodiment of the invention, the photoresist accumulation near the edge of the first protection area can be reduced, so that no electrode material residue exists near the edge of the first protection area, the short circuit of the signal wiring of the first area below the edge of the first protection area is ensured, and the color cast of the display panel caused by the short circuit of the signal wiring is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display substrate, a preparation method thereof, and a display device. Background Art

[0002] A display panel is a device used to display images or videos and is widely used in various electronic products, such as televisions, monitors, laptops, tablets, and smartphones. Core display panel technologies include liquid crystal display (LCD) and organic light-emitting diodes (OLED). The brightness of each sub-area within a display panel must be kept as consistent as possible to ensure optimal display quality. However, in actual use, poor color shift in display panels often occurs due to residual electrode layer material. Summary of the Invention

[0003] In view of this, the purpose of the present application is to provide a display substrate, a manufacturing method thereof, and a display device.

[0004] Based on the above objectives, the first aspect of the present application provides a display substrate, comprising:

[0005] substrate;

[0006] a driving layer disposed on the substrate, the driving layer comprising at least two driving chips and a signal trace connecting two adjacent driving chips, the signal trace comprising a first region proximate to the driving chip and a second region distal to the driving chip;

[0007] The protective layer is provided on the driving layer, and the protective layer includes a first protective area, the first protective area covers the second area, and a first edge groove is provided on the first protective area, and the first edge groove is arranged close to the edge of the first protective area.

[0008] Optionally, in a direction parallel to the substrate, a distance between the first edge groove and an edge of the first protection area is less than or equal to a preset distance.

[0009] Optionally, in a direction perpendicular to the substrate, a depth of the first edge groove is smaller than a thickness of the first protection region.

[0010] Optionally, the protective layer further includes a second protective area, which is located on a side of the driver chip away from the first protective area. An opening area is provided between the second protective area and the first protective area, and the orthographic projection of the opening area on the driver layer completely covers the driver chip.

[0011] Optionally, a plurality of grooves are provided on the second protection area, and the second protection area located between two adjacent grooves and the second protection area located between the grooves and the opening area are both protection parts, and in the direction parallel to the base, the size of the grooves is larger than the size of the protection parts.

[0012] Optionally, in a direction parallel to the base, a ratio of a size of the groove to a size of the protection portion is 8:1 to 12:1.

[0013] Optionally, the protective layer also includes a third protection area, which is connected to both the first protection area and the second protection area. A plurality of second edge grooves are spaced apart on the third protection area, and the plurality of second edge grooves correspond one-to-one to the plurality of slots. The distance between the second edge groove and the edge of the third protection area close to the second protection area is less than or equal to the preset distance.

[0014] Optionally, in a direction parallel to the substrate, a size of the first edge groove and / or the second edge groove is 0.5 to 1.8 microns; and / or the preset distance is less than or equal to 1.5 microns.

[0015] Optionally, in a direction perpendicular to the substrate, the depth of the groove is equal to the thickness of the second protection region.

[0016] Optionally, the orthographic projection of at least one of the grooves on the substrate covers an edge of the substrate.

[0017] Optionally, the signal routing includes a plurality of first routings and a plurality of second routings arranged at intervals, at least one second routing is provided between two adjacent first routings, the first routing is used to transmit signals, and the second routing is used for grounding.

[0018] Based on the same inventive concept, the second aspect of the present application provides a method for preparing a display substrate, comprising:

[0019] providing a substrate;

[0020] A driving layer is provided on the substrate, wherein the driving layer includes at least two driving chips and a signal line connecting two adjacent driving chips, wherein the signal line includes a first area close to the driving chip and a second area away from the driving chip;

[0021] Disposing a protection layer on the driving layer, wherein the protection layer includes a first protection area, and the first protection area covers the second area;

[0022] A first edge groove is provided on the first protection area, and the first edge groove is provided close to an edge of the first protection area.

[0023] Based on the same inventive concept, the third aspect of the present application provides a display device, comprising the display substrate described in any one of the first aspects above or the display substrate prepared by the preparation method described in the second aspect above.

[0024] From the above description, it can be seen that the display substrate, preparation method thereof, and display device provided by the present application, the display substrate includes: a base; a driving layer, provided on the base, the driving layer includes at least two driving chips and a signal line connecting two adjacent driving chips, the signal line includes a first area close to the driving chip and a second area away from the driving chip; a protective layer, provided on the driving layer, the protective layer includes a first protective area, the first protective area covers the second area, a first edge groove is provided on the first protective area, the first edge groove is provided close to the edge of the first protective area, so that the distance between the first edge groove and the edge of the first protective area is very close, so that during the subsequent exposure and development process, due to the limited accuracy of the exposure process, the first edge groove is not The presence of the edge groove makes the positioning of the edge of the first protective area inaccurate during the exposure process, which is equivalent to blurring the edge of the first protective area. The moderately blurred edge can diffuse light, making the exposure of the photoresist more uniform during the exposure process, thereby improving the uniformity of the overall exposure, and thus reducing or even removing the photoresist accumulation near the edge of the first protective area. In this way, in the subsequent etching process, it is ensured that the electrode material cannot be etched due to the photoresist accumulation, and that there will be no electrode material residue near the edge of the first protective area, thereby ensuring that the signal line of the first area below the edge of the first protective area will not be short-circuited, and ensuring that there will be no color deviation of the display panel caused by the short circuit of the signal line. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 This is a first top view showing a substrate in the related art;

[0027] Figure 2 This is a second top view of a display substrate in the related art (with an organic layer provided);

[0028] Figure 3 Schematic diagram of the layout of signal lines in related technology;

[0029] Figure 4It is a cross-sectional schematic diagram of a display substrate in the related art in which an electrode layer and a photoresist layer are provided on an organic layer;

[0030] Figure 5 For related technologies Figure 4 A schematic cross-sectional view of a display substrate after exposure and development on a structure of FIG.

[0031] Figure 6 For related technologies Figure 5 A schematic cross-sectional view of a display substrate after an etching process is performed on the structure;

[0032] Figure 7 is a schematic top view of a display substrate according to an embodiment of the present application;

[0033] Figure 8 is a schematic cross-sectional view of a display substrate taken along the HH plane according to an embodiment of the present application;

[0034] Figure 9 Attached to this application manual Figure 7 A partial enlarged schematic diagram;

[0035] Figure 10a This is a test diagram of a real object of the first protection area when the first edge groove is not provided and the edge inclination angle of the first protection area is controlled to be minimum;

[0036] Figure 10b This is a test image of a real object of the first protection area when the edge inclination angle of the first protection area is controlled to be minimum and the first edge groove is provided;

[0037] Figure 11 Attached to this application manual Figure 7 A partial enlarged schematic diagram of B in the middle;

[0038] Figure 12 This is a partial schematic diagram of the third protection area and the second protection area in the actual product diagram in the embodiment of this application;

[0039] Figure 13 Attached to this application manual Figure 12 The test picture of the real object in Part C;

[0040] Figure 14 This is a test diagram of a physical object in the third protection area in the embodiment of the present application;

[0041] Figure 15 This is a schematic diagram of a first connection method between two driver chips and signal lines according to an embodiment of the present application;

[0042] Figure 16 This is a second connection diagram of two driver chips and signal lines in an embodiment of the present application.

[0043] In the figure: 100, display panel; 110, display area; 120, non-display area; 121, control chip; 122, signal line; 123, edge groove; 130, base substrate; 200, electrode layer; 300, photoresist layer; 400, organic layer; 500, substrate; 600, driving layer; 610, driving chip; 620, signal line; 621, second area; 622, first area; 623, first line; 624, second line; 700, protective layer; 710, first protective area; 711, first edge groove; 720, second protective area; 721, opening area; 722, groove; 723, protective part; 730, third protective area; 731, second edge groove. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0045] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] like Figure 1 and Figure 2 As shown, the display panel 100 includes a base substrate 130, a driving circuit layer located on the base substrate 130, an organic film located on the driving circuit layer, and an electrode layer 200 located on the organic film. The driving circuit layer is used to drive and control the display panel 100 to display. The driving circuit layer may include at least two control chips 121, Figure 1 The following description will be made by taking the display panel 100 including two control chips 121 as an example.

[0047] The display panel 100 includes a display area 110 and a non-display area 120 disposed on at least one side of the display area 110 . The non-display area 120 on at least one side includes a binding sub-area. Two control chips 121 are bound in the binding sub-area of ​​the display panel 100 .

[0048] At least two control chips 121 in the display panel 100 respectively drive different sub-areas in the display area 110 to realize image display. In order to ensure that the brightness of the sub-areas driven by each control chip 121 remains consistent, one of the control chips 121 can be used as a master chip (commonly known as "Master SDIC"), and the other control chips 121 can be used as slave chips (commonly known as "slave SDIC"). The master chip generates a gamma reference voltage signal (commonly known as "Gamma synchronization signal"), and transmits the generated gamma reference voltage signal to the slave chip, so that the gamma reference voltage of the slave chip is consistent with the gamma reference voltage of the master chip. In order to transmit the gamma reference voltage signal, the master chip and the slave chip need to be connected with a signal line 122 (commonly known as "Gamma synchronization signal routing").

[0049] An organic layer 400 is provided on the driving circuit layer. The organic layer 400 is used to isolate the signal line 122 from the electrode layer 200 to prevent the signal line 122 from short-circuiting. The organic layer 400 also plays a role in planarization. Figure 3 As shown, a plurality of signal lines 122 for transmitting voltage signals are set between the two control chips 121. The plurality of signal lines 122 can be GAMMA P0 signal line, GAMMA P1 signal line, GAMMA P2 signal line, GAMMA P3 signal line, GAMMAP4 signal line, GAMMA P5 signal line, GAMMA P6 signal line, GAMMA P7 signal line, GAMMA N7 signal line, GAMMA N6 signal line, GAMMA N5 signal line, GAMMA N4 signal line, GAMMA N3 signal line, GAMMA N2 signal line, GAMMA N1 signal line, GAMMA N0 signal line, etc.

[0050] After the organic layer 400 is produced, it is necessary to dig holes in the organic layer 400 to expose the control chip 121, so that other wires connected to the control chip 121 (such as data lines, etc.) can be connected to the electrode layer 200. In addition, it is necessary to dig grooves on the edge of the organic layer 400 close to the base substrate 130 to facilitate cutting of the panel.

[0051] However, in actual production, it is found that the electrode layer 200 material often remains in the holes and grooves 722. The residual electrode layer 200 material may cause the signal line 122 to short-circuit, thereby causing abnormal gamma reference voltage and ultimately causing poor color deviation in the display panel 100.

[0052] Based on this, the inventors have discovered that this is because the edge of the organic layer 400 is almost perpendicular to the base substrate 130 during the hole-digging and groove-forming 722. Thus, the edge of the organic layer 400 has an inclination angle of almost 90°, and the edge of the organic layer 400 is very clear. During the photolithography process, the photoresist layer 300 needs to undergo a chemical reaction under the irradiation of light of a certain wavelength and dosage. If the light is too sharp (clear edges), it may cause localized uneven exposure. For example, the edges may be underexposed due to diffraction or reflection, which will lead to accumulation of the photoresist layer 300 at the edges. This accumulation of the photoresist layer 300 will prevent the electrode material from being etched, which in turn leads to accumulation of electrode material at the edges.

[0053] Specifically, during actual production, after the electrode layer 200 is formed on the organic layer 400, a photoresist layer 300 (eg, Figure 4 As shown in FIG, the electrode layer 200 in the non-display area 120 is then removed by exposure, development, and etching processes. When the photoresist layer 300 is formed, an excessively large edge tilt angle may cause the photoresist layer 300 to accumulate at the bottom of the tilt angle, thereby causing the exposure process to fail to fully expose this portion of the accumulated photoresist layer 300, ultimately resulting in this portion of the photoresist layer 300 remaining at the bottom of the tilt angle (as shown in FIG. Figure 5 As shown), when the photolithography process is subsequently performed, the electrode layer 200 covered by this part of the photoresist layer 300 cannot be etched, thereby causing the electrode layer 200 material to remain near the edge tilt angle (as shown). Figure 6 shown).

[0054] Continue to see Figure 2 As shown, since the edge of the organic layer 400 is located just above the signal line 122, the electrode layer 200 material remaining near the edge inclination will be connected to the signal line 122, causing the signal line 122 to short-circuit, thereby causing abnormal gamma reference voltage, and ultimately causing poor color deviation of the display panel 100.

[0055] Therefore, how to improve the edge tilt angle of the organic layer 400 to solve the color shift of the display panel 100 caused by the residual material of the electrode layer 200 is an urgent problem to be solved.

[0056] Since the holes and grooves on the organic layer 400 are small in size, it is difficult to etch or cut the inclination of the edge morphology of the holes or grooves 722 of the organic layer 400 using existing processes. Therefore, it is difficult to directly improve the inclination of the edge morphology by etching or cutting.

[0057] Based on this, see Figure 7 、 Figure 8 and Figure 9 As shown, the present application provides a display substrate, comprising:

[0058] Base 500;

[0059] A driving layer 600 is provided on the substrate 500. The driving layer 600 includes at least two driving chips 610 and a signal trace 620 connecting two adjacent driving chips 610. The signal trace 620 includes a first region 622 close to the driving chip 610 and a second region 621 away from the driving chip 610.

[0060] The protective layer 700 is disposed on the driving layer 600 . The protective layer 700 includes a first protective area 710 . The first protective area 710 covers the second area 621 . A first edge groove 711 is provided on the first protective area 710 . The first edge groove 711 is arranged close to the edge of the first protective area 710 .

[0061] Specifically, the substrate 500 can support and protect various components of the display substrate. The material of the substrate 500 may include an inorganic material, for example, the inorganic material may be glass, quartz or metal. The material of the substrate 500 may also include an organic material, for example, the organic material may be a resin material such as polyimide, polycarbonate, polyacrylate, polyetherimide, polyethersulfone, polyethylene terephthalate and polyethylene naphthalate. The substrate 500 can be formed by multiple layers of material, for example, the substrate 500 may include a multilayer substrate 500 layer, and the material of the substrate 500 layer may be any of the above materials. Of course, the substrate 500 can also be set as a single layer, which may be any of the above materials.

[0062] The base 500 may be flexible, stretchable, foldable, bendable and / or rollable, so the display substrate may also be flexible, stretchable, foldable, bendable and / or rollable.

[0063] The substrate 500 includes a display area and a non-display area. The display area is the area in the display substrate where an image is displayed. The display area may include a plurality of sub-pixels and a driving circuit arranged in an array. A sub-pixel is the smallest unit used to configure a screen, and each of the plurality of sub-pixels may emit light of a different wavelength. For example, the plurality of sub-pixels may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. However, the plurality of sub-pixels is not limited thereto and may also include a white sub-pixel. The driving circuit of the sub-pixel is a circuit for controlling the driving of the sub-pixel to emit light. For example, the driving circuit may be configured to include a thin film transistor and a capacitor, but is not limited thereto.

[0064] The non-display area is an area where no image is displayed and where various components for driving the plurality of sub-pixels provided in the display area 110 may be located. For example, a driver IC that provides signals for driving the plurality of sub-pixels, a flexible film, etc. may be located in the non-display area. The non-display area may be an area surrounding the display area, but is not limited thereto. For example, the non-display area may be an area extending from the display area.

[0065] The driving layer 600 is disposed on the substrate 500 and includes at least two driving chips 610 and a signal trace 620 connecting two adjacent driving chips 610. The at least two driving chips 610 and the signal trace 620 are both located in the non-display area.

[0066] The signal trace 620 includes a first area 622 close to the driver chip 610 and a second area 621 away from the driver chip 610 , that is, the second area 621 is the central area of ​​the signal trace 620 , and the first area 622 is the edge area including both ends of the signal trace 620 .

[0067] The protective layer 700 is arranged on the driving layer 600, and the protective layer 700 includes a first protective area 710, and the first protective area 710 covers the second area 621. In this way, the first protective area 710 can be used to protect the second area 621 to prevent the second area 621 of the signal line 620 from contacting the electrode layer 200 above the protective layer 700 during the manufacturing work, ensuring that the second area 621 of the signal line 620 will not short-circuit.

[0068] The first protective area 710 covers the second area 621, so that the edge of the first protective area 710 is located above the first area 622. In this way, if the electrode material is accumulated on the edge of the first protective area 710 during the preparation process, it is very likely that the electrode material layer and the first area 622 of the signal line 620 will come into contact, thereby causing the signal line 620 in the first area 622 to come into contact, thereby causing a short circuit, and ultimately causing poor color deviation of the display panel 100.

[0069] Therefore, in this application, a first edge groove 711 is provided on the first protection area 710, and the first edge groove 711 is arranged close to the edge of the first protection area 710. The edge of the first protection area 710, that is, the first protection area 710 is located on the second area 621 and close to the edge of the driving chip 610.

[0070] Thus, when the first edge groove 711 is set close to the edge of the first protective region 710, the distance between the first edge groove 711 and the edge of the first protective region 710 is very close. Thus, during the subsequent exposure and development process, due to the limited accuracy of the exposure process, the presence of the first edge groove 711 makes the positioning of the edge of the first protective region 710 inaccurate during the exposure process, which is equivalent to blurring the edge of the first protective region 710. A moderately blurred edge can diffuse light, making the exposure of the photoresist more uniform during the exposure process. At the same time, the blurred edge can partially offset the diffraction effect. The light distribution is smoother, thereby improving the uniformity of the overall exposure, and reducing or even removing the photoresist accumulation near the edge of the first protective area 710. In this way, during the subsequent etching process, it is ensured that the electrode material cannot be etched due to the photoresist accumulation, and that there is no residual electrode material near the edge of the first protective area 710. This ensures that the signal line 620 in the first area 622 below the edge of the first protective area 710 will not be short-circuited, and ensures that the color deviation of the display panel 100 caused by the short circuit of the signal line 620 will not occur.

[0071] In some embodiments, in a direction parallel to the substrate 500 (ie Figure 8 and Figure 9 In the direction M described in FIG), the distance between the first edge groove 711 and the edge of the first protection area 710 is less than or equal to a preset distance.

[0072] Specifically, the preset distance is the minimum distance that can be achieved in an actual manufacturing process. For example, the preset distance can be 1.5 microns or 1 micron.

[0073] When the distance between the first edge groove 711 and the edge of the first protective area 710 is less than or equal to the preset distance, since the preset distance is a very small distance, the distance between the first edge groove 711 and the edge of the first protective area 710 is very close. In this way, when performing the subsequent exposure and development process, due to the limited accuracy of the exposure process, the existence of the first edge groove 711 makes the positioning of the edge of the first protective area 710 inaccurate during the exposure process, which is equivalent to blurring the edge of the first protective area 710. The moderately blurred edge can diffuse light, making the exposure of the photoresist more uniform during the exposure process, thereby improving the uniformity of the overall exposure.

[0074] If the distance between the first edge groove 711 and the edge of the first protective area 710 is greater than the preset distance, the distance between the first edge groove 711 and the edge of the first protective area 710 is relatively large. In this way, during the subsequent exposure and development process, although the accuracy of the exposure process is limited, the first edge groove 711 and the edge of the first protective area 710 that are too far apart can still be positioned separately. In this way, the edges of the first edge groove 711 and the first protective area 710 will be exposed at the same time. The setting of the first edge groove 711 cannot blur the edge of the first protective area 710, resulting in the edge of the first protective area 710 still being very obvious, and there will still be accumulation of photoresist due to insufficient exposure near the edge of the first protective area 710, and then there will still be accumulation of electrode material, which will still cause the signal line 620 in the first area 622 to short-circuit and the display panel 100 to have poor color deviation.

[0075] Therefore, in this application, the distance between the first edge groove 711 and the edge of the first protective area 710 must be controlled to be less than or equal to a preset distance to ensure that the setting of the first edge groove 711 can blur the edge of the first protective area 710, thereby improving the uniformity of the overall exposure, and further ensuring that there will be no accumulation of photoresist and electrode materials, no short circuit of the signal line 620, and no poor color deviation of the display panel 100.

[0076] In some embodiments, in a direction perpendicular to the substrate 500 (ie Figure 8 In the direction indicated by N in FIG), the depth of the first edge groove 711 is less than the thickness of the first protection area 710.

[0077] Specifically, the depth of the first edge groove 711 is less than the thickness of the first protective area 710, so that even if the first edge groove 711 is set, the first protective area 710 can still completely cover the second area 621, ensuring that the second area 621 can be protected by the first protective area 710, preventing the second area 621 of the signal trace 620 from contacting the electrode layer 200 above the protective layer 700, and ensuring that a short circuit does not occur in the second area 621 of the signal trace 620.

[0078] On the other hand, without affecting the coverage of the first protection area 710 on the second area 621, setting the first edge groove 711 can blur the edge of the first protection area 710, thereby improving the uniformity of the overall exposure, and further ensuring that there will be no accumulation of photoresist and electrode materials, no short circuit of the signal line 620, and no poor color deviation of the display panel 100.

[0079] In some embodiments, see Figure 10a and Figure 10bAs shown, Figure 10a This is a test diagram of the first protection area 710 when the first edge groove 711 is not provided and the edge inclination angle of the first protection area 710 is controlled to be minimum. Figure 10b This is a test diagram of the actual first protection area 710 when the edge inclination angle of the first protection area 710 is controlled to be minimum and the first edge groove 711 is set. After testing, it can be seen that when the first edge groove 711 is not set, the edge inclination angle of the first protection area 710 identified during the exposure process is 65°; when the first edge groove 711 is set, the edge inclination angle of the first protection area 710 identified during the exposure process is reduced to 26°. This shows that the setting of the first edge groove 711 can blur the edge inclination angle, which is equivalent to reducing the edge inclination angle, thereby reducing the residual photoresist near the edge inclination angle.

[0080] In some embodiments, see Figure 7 、 Figure 8 and Figure 11 As shown, the protective layer 700 also includes a second protective area 720, which is located on the side of the driver chip 610 away from the first protective area 710. An opening area 721 is provided between the second protective area 720 and the first protective area 710, and the orthographic projection of the opening area 721 on the driver layer 600 completely covers the driver chip 610.

[0081] Specifically, the orthographic projection of the opening area 721 on the driving layer 600 completely covers the driving chip 610, so that the driving chip 610 can be exposed, which facilitates the driving chip 610 and various wirings connected to the driving chip 610 to function, and ensures that the setting of the protective layer 700 will not affect the driving chip 610 and various wirings connected to the driving chip 610. At the same time, the setting of the opening area 721 can also avoid the accumulation of anisotropic conductive paste (ACP). The main function of anisotropic conductive paste (ACP) is to provide stable conductive connection and mechanical fixation.

[0082] In the actual production process, as described above and refer to Figure 2As shown, in actual production, it is necessary to dig a groove at the edge of the organic layer 400 near the base substrate 130 to form an edge groove 123, which is convenient for cutting the panel. However, for the edge groove 123, since the groove edge of the edge groove 123 (i.e., the groove edge of the organic layer 400) is almost perpendicular to the base substrate 130, the groove edge of the edge groove 123 is very clear. During the photolithography process, the photoresist needs to react chemically under the irradiation of light of a certain wavelength and dosage. If the light is too sharp (clear edges), it may cause uneven local exposure, such as insufficient exposure at the groove edge due to diffraction or reflection, which will result in the accumulation of photoresist near the groove edge. The accumulation of photoresist will affect the production of subsequent film layers, and thus affect the performance of the display panel 100.

[0083] Based on this, in some embodiments, continue to see Figure 7 、 Figure 8 and Figure 11 As shown, a plurality of grooves 722 are provided on the second protection area 720. The second protection area 720 located between two adjacent grooves 722 and the second protection area 720 located between the groove 722 and the opening area 721 are both protection parts 723. In the direction parallel to the base 500, the size of the groove 722 is larger than the size of the protection part 723.

[0084] Specifically, a plurality of slots 722 are provided on the second protection area 720. The second protection area 720 located between two adjacent slots 722 and the second protection area 720 located between the slots 722 and the opening area 721 are both protection portions 723. Figure 2 The positions of the edge grooves shown are changed to an alternating arrangement of grooves 722 , protection portions 723 , grooves 722 , and protection portions 723 .

[0085] Since the size of the groove 722 is larger than the size of the protective portion 723, the size of the protective portion 723 is very small compared to the size of the groove 722. In this way, when performing the exposure process, the setting of the very small protective portion 723 makes the edges of the adjacent grooves 722 blurred, thereby improving the uniformity of the overall exposure, and further ensuring that no photoresist will accumulate near the groove edge of the groove 722, ensuring that there will be no impact on the production of subsequent film layers.

[0086] In some embodiments, in a direction parallel to the base 500 , a ratio of a size of the slot 722 to a size of the protection portion 723 is 8:1 to 12:1.

[0087] Specifically, when the ratio of the size of the slot 722 to the size of the protection portion 723 is 8:1 to 12:1, the difference between the size of the slot 722 and the size of the protection portion 723 is moderate, ensuring that the setting of the protection portion 723 can blur the edges of the adjacent slots 722.

[0088] When the ratio of the size of the slot 722 to the size of the protection portion 723 is less than 8:1, the size of the protection portion 723 is not small enough compared to the size of the slot 722, so that the setting of the protection portion 723 cannot blur the edges of the adjacent slots 722.

[0089] When the ratio of the size of the slot 722 to the size of the protection portion 723 is greater than 12:1, the size of the protection portion 723 is too small, which is not conducive to the manufacturing process and increases the manufacturing cost.

[0090] In some embodiments, in a direction perpendicular to the substrate 500 , the depth of the groove 722 is equal to the thickness of the second protective area 720 , thereby ensuring that the setting of the groove 722 can completely expose the film layer located under the protective layer 700 , facilitating the subsequent cutting process of the display panel 100 .

[0091] In some embodiments, the orthographic projection of at least one of the slots 722 on the substrate 500 covers the edge of the substrate 500, thereby ensuring that the edge of the substrate 500 is not covered by the protective layer 700, facilitating the subsequent cutting process of the display panel 100 and ensuring that the setting of the protective layer 700 does not affect the cutting of subsequent panels.

[0092] In some embodiments, see Figure 7 、 Figure 11 、 Figure 12 and Figure 13 As shown, the protective layer 700 also includes a third protective area 730, which is connected to both the first protective area 710 and the second protective area 720. A plurality of second edge grooves 731 are spaced apart on the third protective area 730, and the plurality of second edge grooves 731 correspond one-to-one to the plurality of slots 722. The distance between the second edge groove 731 and the edge of the third protective area 730 close to the second protective area 720 is less than or equal to the preset distance.

[0093] Specifically, the third protection area 730 is connected to the first protection area 710 and the second protection area 720, and the third protection area 730 covers other areas of the display substrate (including the display area 110 on the display substrate), and the other areas refer to the areas covered by the first protection area 710 and the second protection area 720 on the display substrate.

[0094] A plurality of second edge grooves 731 are spaced apart on the third protective region 730. The plurality of second edge grooves 731 correspond one-to-one with the plurality of slots 722. The distance between the second edge grooves 731 and the edge of the third protective region 730 near the second protective region 720 is less than or equal to the predetermined distance. Thus, the second edge grooves 731 are very close to the edge of the third protective region 730 near the second protective region 720. Therefore, during the subsequent exposure and development process, due to the limited precision of the exposure process, the presence of the second edge grooves 731 results in inaccurate positioning of the edge of the third protective region 730 near the second protective region 720 during the exposure process, which is equivalent to blurring the edge of the third protective region 730. Moderately blurred edges can diffuse light, resulting in more uniform exposure of the photoresist during the exposure process. Furthermore, the blurred edges can partially offset the diffraction effect, resulting in smoother light distribution, thereby improving overall exposure uniformity. This can reduce or even eliminate photoresist buildup near the edge of the third protective region 730, ensuring that no photoresist remains near the edge of the third protective region 730, thereby not affecting the fabrication of subsequent film layers.

[0095] The preset distance is the minimum distance that can be achieved in an actual manufacturing process. For example, the preset distance can be 1.5 microns or 1 micron.

[0096] In some embodiments, in a direction parallel to the substrate 500 , a size of the first edge groove 711 and / or the second edge groove 731 is 0.5 to 1.8 microns; and / or the preset distance is less than or equal to 1.5 microns.

[0097] Specifically, the size of the first edge groove 711 and / or the second edge groove 731 is 0.5 to 1.8 microns. At this time, the size of the first edge groove 711 and / or the second edge groove 731 is moderate, and the size of the first edge groove 711 and the second edge groove 731 is small, which can play a role in blurring the edges. At the same time, the production of the first edge groove 711 and the second edge groove 731 can also be realized in terms of process.

[0098] If the size of the first edge groove 711 and / or the second edge groove 731 is less than 0.5 microns, then the size of the first edge groove 711 and / or the second edge groove 731 is too small and may not be feasible in terms of process, or even if it can be feasible in terms of process, it will be very difficult, which increases the difficulty of the process and the production cost, and is not conducive to practical use.

[0099] If the size of the first edge groove 711 and / or the second edge groove 731 is greater than 1.8 microns, then the size of the first edge groove 711 and / or the second edge groove 731 is too large. During the exposure process, the size of the first edge groove 711 and / or the second edge groove 731 cannot be ignored and has become an exposure area that can be accurately positioned. As a result, the setting of the first edge groove 711 and the second edge groove 731 cannot play the role of blurring the edges.

[0100] Illustratively, in a direction parallel to the substrate 500, the size of the first edge groove 711 and / or the second edge groove 731 may be 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, etc.

[0101] The preset distance is less than or equal to 1.5 microns and greater than 0 microns, so as to ensure that the distance between the first edge groove 711 and the second edge groove 731 and the corresponding edge is small, so as to ensure that the setting of the first edge groove 711 and the second edge groove 731 can blur the edges of the first protection area 710 and the third protection area 730, thereby improving the uniformity of the overall exposure, and further ensuring that there will be no accumulation of photoresist near the edge.

[0102] Exemplarily, the preset distance may be 0.1 micron, 0.2 micron, 0.3 micron, 0.4 micron, 0.5 micron, 0.6 micron, 0.7 micron, 0.8 micron, 0.9 micron, 1.0 micron, 1.1 micron, 1.2 micron, 1.3 micron, 1.4 micron, 1.5 micron, etc.

[0103] In some embodiments, see Figure 14 As shown, it is known from the test that by setting the second edge groove 731, the amount of photoresist residue accumulated near the edge of the third protection area 730 can be reduced from the existing Reduce to The data show that the amount of photoresist accumulated near the edge of the third protection region 730 can be effectively reduced by providing the second edge groove 731 .

[0104] In some embodiments, see Figure 15 As shown, the signal line 620 includes a plurality of first lines 623 and a plurality of second lines 624 arranged at intervals, and at least one second line 624 is provided between two adjacent first lines 623. The first lines 623 are used to transmit signals, and the second lines 624 are used for grounding.

[0105] Specifically, at least one second trace 624 is provided between two adjacent first traces 623. The first trace 623 is used to transmit signals, and the second trace 624 is used for grounding. In this way, even if there is residual electrode material,

[0106] Then the residual electrode material will only short-circuit two adjacent lines. Since in this application, there is at least one second line 624 between the two adjacent first lines 623, even if a short circuit occurs, it will not occur on the two first lines 623, but will occur on the two second lines 624, or on one first line 623 and one second line 624. In other words, the residual electrode material will not cause the two first lines 623 to be short-circuited at the same time, and the short circuit between the second lines 624 used for grounding will not cause color deviation of the display panel 100. This can effectively reduce the color deviation of the display panel 100 and the probability of defects caused by the short circuit of the signal line 620.

[0107] In specific implementation, the type of the signal trace 620 connected to the driver chip 610 can be adjusted by modifying or adjusting the pins of the driver chip 610. On the premise of ensuring that the first trace 623 can meet the signal transmission requirements, at least one second trace 624 is set between adjacent first traces 623 to reduce the risk of short circuit of the first trace 623 and improve the yield of the display panel 100.

[0108] For example, see Figure 16 As shown, multiple signal traces 620 for transmitting voltage signals are set between the two driver chips 610. The multiple signal traces 620 can be a GAMMA P0 signal trace, a GAMMA P1 signal trace, a GAMMAN1 signal trace, and a GAMMA N0 signal trace, etc. Four GND signal traces (i.e., second traces 624) are set between two adjacent signal traces 620.

[0109] In this way, even if electrode material residue occurs, it is highly likely that the residue will only cause a short circuit between two adjacent GND signal lines, and will not cause a short circuit between two adjacent GAMMA signal lines. Therefore, the risk of short circuiting the first line 623 can be reduced, and the yield of the display panel 100 can be improved.

[0110] The present application also provides a method for preparing a display substrate, comprising:

[0111] Providing a substrate 500;

[0112] A driving layer 600 is provided on the substrate 500. The driving layer 600 includes at least two driving chips 610 and a signal trace 620 connecting two adjacent driving chips 610. The signal trace 620 includes a first region 622 close to the driving chip 610 and a second region 621 away from the driving chip 610.

[0113] A protection layer 700 is provided on the driving layer 600 , wherein the protection layer 700 includes a first protection region 710 , and the first protection region 710 covers the second region 621 ;

[0114] A first edge groove 711 is provided on the first protection area 710 , and the first edge groove 711 is provided close to an edge of the first protection area 710 .

[0115] Specifically, in the present application, a first edge groove 711 is provided on the first protection area 710. The first edge groove 711 is provided close to the edge of the first protection area 710. Thus, the distance between the first edge groove 711 and the edge of the first protection area 710 is very close. In this way, during the subsequent exposure and development process, due to the limited accuracy of the exposure process, the presence of the first edge groove 711 makes the positioning of the edge of the first protection area 710 inaccurate during the exposure process, which is equivalent to blurring the edge of the first protection area 710. A moderately blurred edge can diffuse the light, making the exposure more precise. During the process, the exposure of the photoresist is more uniform, thereby improving the uniformity of the overall exposure, and thus reducing or even removing the photoresist accumulation near the edge of the first protective area 710. In this way, in the subsequent etching process, it is ensured that the electrode material cannot be etched due to the photoresist accumulation, and that there will be no electrode material residue near the edge of the first protective area 710, thereby ensuring that the signal line 620 in the first area 622 located below the edge of the first protective area 710 will not be short-circuited, and ensuring that the color deviation of the display panel 100 caused by the short circuit of the signal line 620 will not occur.

[0116] In some embodiments, the display substrate may further include an electrode layer 200 , and the electrode layer 200 is located on the protective layer 700 .

[0117] Specifically, when the display substrate is a liquid crystal display substrate, the electrode layer 200 may be a common electrode layer 200; when the display substrate is an organic light emitting diode display substrate, the electrode layer 200 may be an anode layer or a cathode layer.

[0118] The present application also provides a display device, comprising any of the display substrates described above or a display substrate prepared by the preparation method described in any of the above embodiments.

[0119] The display device can be a product with an image display function, such as: a monitor, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a digital camera, a portable camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, a home appliance, an information query device (such as business query equipment and monitors of e-government, banks, hospitals, power departments, etc.).

[0120] The display device has the technical effects described in any of the above embodiments, which will not be described in detail here.

[0121] It should be noted that the above description is limited to some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in an order different from that described in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0122] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application is limited to these examples. In line with the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0123] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display substrate, characterized in that: include: substrate; a driving layer disposed on the substrate, the driving layer comprising at least two driving chips and a signal trace connecting two adjacent driving chips, the signal trace comprising a first region proximate to the driving chip and a second region distal to the driving chip; The protective layer is provided on the driving layer, and the protective layer includes a first protective area, the first protective area covers the second area, and a first edge groove is provided on the first protective area, and the first edge groove is arranged close to the edge of the first protective area.

2. The display substrate according to claim 1, wherein: In a direction parallel to the substrate, a distance between the first edge groove and an edge of the first protection area is less than or equal to a preset distance.

3. The display substrate according to claim 1, wherein In a direction perpendicular to the substrate, a depth of the first edge groove is smaller than a thickness of the first protection region.

4. The display substrate according to claim 1, wherein The protective layer also includes a second protective area, which is located on a side of the driver chip away from the first protective area. An opening area is provided between the second protective area and the first protective area, and the orthographic projection of the opening area on the driver layer completely covers the driver chip.

5. The display substrate according to claim 4, wherein: The second protection area is provided with a plurality of grooves. The second protection area located between two adjacent grooves and the second protection area located between the grooves and the opening area are both protection parts. In the direction parallel to the base, the size of the grooves is larger than the size of the protection parts.

6. The display substrate according to claim 5, wherein: In a direction parallel to the base, a ratio of a size of the groove to a size of the protection portion is 8:1 to 12:

1.

7. The display substrate according to claim 5, wherein: In a direction perpendicular to the substrate, the depth of the groove is equal to the thickness of the second protection region.

8. The display substrate according to claim 5, wherein: The orthographic projection of at least one of the grooves on the substrate covers the edge of the substrate.

9. The display substrate according to claim 5, wherein: The protective layer also includes a third protective area, which is connected to both the first protective area and the second protective area. A plurality of second edge grooves are spaced apart on the third protective area, and the plurality of second edge grooves correspond one-to-one to the plurality of slots. The distance between the second edge groove and the edge of the third protective area close to the second protective area is less than or equal to the preset distance.

10. The display substrate according to claim 1, wherein In a direction parallel to the substrate, a size of the first edge groove and / or the second edge groove is 0.5 to 1.8 micrometers; and / or the preset distance is less than or equal to 1.5 micrometers.

11. The display substrate according to claim 1, wherein The signal routing includes a plurality of first routings and a plurality of second routings arranged at intervals, at least one second routing is provided between two adjacent first routings, the first routing is used for transmitting signals, and the second routing is used for grounding.

12. A method for preparing a display substrate, characterized in that: include: providing a substrate; A driving layer is provided on the substrate, wherein the driving layer includes at least two driving chips and a signal line connecting two adjacent driving chips, wherein the signal line includes a first area close to the driving chip and a second area away from the driving chip; Disposing a protection layer on the driving layer, wherein the protection layer includes a first protection area, and the first protection area covers the second area; A first edge groove is provided on the first protection area, and the first edge groove is provided close to an edge of the first protection area.

13. A display device, characterized in that: The display substrate comprises the display substrate according to any one of claims 1 to 11 or the display substrate prepared by the preparation method according to claim 12.

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