Display back panel and preparation method thereof, and mobile terminal

Abstract

The present application discloses a display backplane and a preparation method thereof, and a mobile terminal; the display backplane comprises a driving backplane, a reflective film layer arranged on the driving backplane, and a plurality of terminals, the reflective film layer comprises a plurality of openings, a plurality of the terminals are arranged in the plurality of the openings, one terminal corresponds to one opening, the thickness of the reflective film layer is greater than the thickness of the terminal, the reflective film layer comprises a dark pigment, and the mass percentage of the dark pigment in the reflective film layer is 0.01% to 0.1%; the present application reduces the reflectivity of the reflective film layer by adding a dark pigment to the reflective film layer, so that the light during exposure can penetrate to the bottom of the reflective film layer, so that the bottom material of the reflective film layer is completely cured, and the reflective film layer at the bottom of the exposure area is prevented from being undercut by the developer during development to form an undercut structure, thereby preventing the protrusion from falling off.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display backplane and a preparation method thereof, and a mobile terminal. Background Art

[0002] Sub-millimeter light-emitting diode (Mini LED) display panels have significant advantages such as higher brightness, better luminous efficiency and lower power consumption, and have become the focus of research in the display panel industry.

[0003] At present, Mini LED display panels generally prepare a layer of photosensitive white ink on the surface of the panel, and use white ink to improve the reflectivity of the Mini LED display panel. However, the high reflectivity of white ink makes it difficult for light to penetrate the white ink at the bottom during exposure, resulting in incomplete curing of the white ink at the bottom, and an undercut structure will be generated during development. The undercut structure will fall off in the pad area due to external force, resulting in poor contact between the lamp bead and the pad; at the same time, the film thickness in the undercut area is lower than that in the non-undercut area, resulting in the technical problem of uneven reflectivity in the display panel. Summary of the invention

[0004] The present application provides a display backplane and a method for preparing the same, and a mobile terminal, so as to improve the technical problem of an undercut structure existing in the ink layer of the current display backplane.

[0005] To solve the above-mentioned problems, the technical solutions provided by this application are as follows:

[0006] The present application proposes a display backplane, which includes:

[0007] Driver backplane;

[0008] A reflective film layer, disposed on the driving back plate, wherein the reflective film layer comprises a plurality of openings;

[0009] A plurality of terminals are arranged on the driving backplane, the plurality of terminals are arranged in the plurality of openings, one terminal corresponds to one opening, and the thickness of the reflective film layer is greater than the thickness of the terminal;

[0010] Wherein, the reflective film layer includes a dark pigment, and the mass percentage of the dark pigment in the reflective film layer is 0.01% to 0.1%.

[0011] In the display backplane of the present application, the reflective film layer further comprises a protrusion disposed on the side wall of the opening and extending toward the central axis of the opening, and a surface of the protrusion away from the driving backplane and a surface of the reflective film layer away from the driving backplane are located on the same plane;

[0012] Wherein, the ratio of the length of the protrusion extending toward the central axis of the opening to the thickness of the reflective film layer is in a range of 0.1 to 0.3.

[0013] In the display backplane of the present application, in the direction of the protrusion from the side wall of the opening to the central axis of the opening, the thickness of the protrusion gradually decreases or the thickness of the protrusion is equal.

[0014] In the display backplane of the present application, the ratio of the thickness of the protruding portion to the thickness of the reflective film layer ranges from 0.1 to 0.3.

[0015] In the display backplane of the present application, the dark pigment includes at least one of a basic dye or guaiazulene.

[0016] In the display backplane of the present application, the mass proportion of the dark pigment on the side of the reflective film layer close to the driving backplane is greater than the mass proportion of the dark pigment on the side away from the driving backplane.

[0017] In the display backplane of the present application, the driving backplane further comprises an insulating film layer in contact with the reflective film layer, and the insulating film layer comprises the dark pigment;

[0018] Wherein, the mass proportion of the dark pigment in the insulating film layer is smaller than the mass proportion of the dark pigment in the reflective film layer.

[0019] The present application also proposes a method for preparing a display backplane, which comprises:

[0020] A plurality of terminals and a reflective material layer are sequentially formed on the driving backplane, wherein the reflective material layer covers the plurality of terminals, and the reflective material layer includes a dark pigment;

[0021] Performing patterning on the reflective material layer to form a plurality of openings corresponding to the plurality of terminals on the reflective material layer;

[0022] heating the reflective material layer at a preset temperature so that the reflective material layer forms a reflective film layer;

[0023] Wherein, the preset temperature is greater than the melting point of the dark pigment.

[0024] In the method for preparing the display backplane of the present application, the reflective material layer further includes white ink, and the mass ratio of the dark pigment to the white ink in the reflective material layer is 0.1 to 0.4.

[0025] The present application also proposes a mobile terminal, the mobile terminal comprising the above-mentioned display back panel

[0026] Beneficial effects: The present application discloses a display backplane and a preparation method thereof, and a mobile terminal; the display backplane includes a driving backplane and a reflective film layer and a plurality of terminals arranged on the driving backplane, the reflective film layer includes a plurality of openings, the plurality of terminals are arranged in the plurality of openings, one terminal corresponds to one opening, the thickness of the reflective film layer is greater than the thickness of the terminal, the reflective film layer includes a dark pigment, and the mass percentage of the dark pigment in the reflective film layer is 0.01% to 0.1%; the present application reduces the reflectivity of the reflective film layer by adding a dark pigment to the reflective film layer, so that the light during exposure can penetrate to the bottom of the reflective film layer, so that the bottom material of the reflective film layer is completely cured, and the reflective film layer at the bottom of the exposure area is prevented from being undercut by the developer during development to form an undercut structure, thereby preventing the protrusion from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0028] Figure 1 A simplified structural diagram of the back panel is shown for this application;

[0029] Figure 2 A structural diagram of a driving backplane in a display backplane for this application;

[0030] Figure 3 A process diagram showing the backplane manufacturing method for this application;

[0031] Figures 4a to 4c A process flow chart showing a backplane preparation method for this application. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0033] See also Figure 1 to Figure 2 The present application proposes a display backplane 100 , which includes a driving backplane 10 , a reflective film layer 20 disposed on the driving backplane 10 , and a plurality of terminals 30 .

[0034] In this embodiment, the reflective film layer 20 includes a plurality of openings 210 , a plurality of the terminals 30 are disposed in the plurality of openings 210 , one terminal 30 corresponds to one opening 210 , and the thickness of the reflective film layer 20 is greater than the thickness of the terminal 30 .

[0035] In this embodiment, the reflective film layer 20 includes a dark pigment, and the mass percentage of the dark pigment in the reflective film layer 20 is 0.01% to 0.1%.

[0036] The present application reduces the reflectivity of the reflective film layer 20 by adding dark pigments to the reflective film layer 20, so that the light during exposure can penetrate to the bottom of the reflective film layer 20, so that the bottom material of the reflective film layer 20 is completely cured, and the reflective film layer 20 at the bottom of the exposure area is prevented from being undercut by the developer during development, thereby preventing the protrusions from falling off.

[0037] It should be noted that the display backplane 100 can be used as a direct display device. For example, the light-emitting device of the display backplane 100 can be Mini LED or Micro LED, etc., or the display backplane 100 can also be used as a backlight source of a liquid crystal display panel.

[0038] The technical solution of the present application is now described in conjunction with specific embodiments.

[0039] See also Figure 2 The driving backplane 10 may include a substrate 101 and a thin film transistor layer disposed on the substrate 101. When the driving backplane 10 is a flexible backplane, the substrate 101 may be made of a flexible material such as polyimide, or a laminated film layer of a flexible material and an inorganic material; when the driving backplane 10 is a flexible backplane, the substrate 101 may be made of a rigid material such as glass or quartz.

[0040] In this example, see Figure 2 The thin film transistor layer may include a plurality of thin film transistors, and the thin film transistors may be of an etch barrier type, a back channel etch type, or may be divided into a bottom gate thin film transistor, a top gate thin film transistor, and the like structure according to the position of the gate electrode and the active layer, and there is no specific limitation. For example, Figure 2 The thin film transistor shown in the figure is a bottom-gate thin film transistor, which may include a gate layer 102 arranged on the substrate 101, a gate insulating layer 103 arranged on the gate layer 102, an active layer 104 arranged on the gate insulating layer 103, an inter-insulating layer 105 arranged on the active layer 104, a source-drain layer 106 arranged on the inter-insulating layer 105, and a planarizing layer 107 arranged on the source-drain layer 106.

[0041] In this embodiment, the reflective film layer 20 may be in contact with the planar layer 107 , and the plurality of terminals 30 are electrically connected to the source-drain electrode layer 106 on the thin film transistor layer through via holes on the planar layer 107 .

[0042] See also Figure 1The reflective film layer 20 also includes a protrusion 220 arranged on the side wall of the opening 210 and extending toward the central axis O of the opening 210. The surface of the protrusion 220 away from the driving backplane 10 and the surface of the reflective film layer 20 away from the driving backplane 10 are located on the same plane.

[0043] In this embodiment, a ratio of a length L2 of the protrusion 220 extending toward the central axis O of the opening 210 to a thickness L1 of the reflective film layer 20 is in a range of 0.1 to 0.3.

[0044] In the prior art, due to the high reflectivity of the reflective film layer 20, when the reflective film layer 20 is subjected to an exposure process, most of the light irradiated on the reflective film layer 20 is reflected by the reflective film layer 20, and the light in the exposure process cannot penetrate the reflective film layer 20 material at the bottom, so that the film layer material of the reflective film layer 20 close to the driving backplane 10 cannot be solidified, resulting in that in the process of forming the opening 210, the lateral etching rate is greater than the longitudinal etching rate, resulting in an undercut structure in the opening area, and the film layer material of the undercut structure is easy to fall off and cover the terminal 30 in the opening 210, resulting in poor contact between the lamp bead and the terminal 30.

[0045] In this embodiment, dark-colored material is added to the reflective film layer 20 to reduce the reflectivity of the reflective film layer 20, so that the light irradiated on the reflective film layer 20 passes through the reflective film layer 20, so that the film material of the reflective film layer 20 close to the driving backplane 10 is solidified, the rate of lateral etching in the development process is reduced, and the dimension L2 extending from the protrusion 220 to the central axis O of the opening 210 is reduced, so that the ratio of the dimension L2 extending from the protrusion 220 to the central axis O of the opening 210 to the thickness dimension L1 of the reflective film layer 20 falls within a safe range, thereby reducing the risk of the film material of the bottom cut structure falling off.

[0046] In the display backplane 100 of the present application, in the direction from the protrusion 220 to the central axis O of the opening 210 , the thickness of the protrusion 220 from the side wall of the opening 210 gradually decreases or the thickness of the protrusion 220 is uniform.

[0047] In this example, see Figure 1 The protrusion 220 includes a first surface S1 away from the driving back plate 10 and a second surface S2 close to the driving back plate 10. The thickness of the protrusion 220 from the side wall S3 of the opening 210 is the distance L4 between the first surface S1 and the second surface S2. The thickness L4 of the protrusion 220 from the side wall of the opening 210 gradually decreases or the thickness L4 of the protrusion 220 is equal.

[0048] In this embodiment, the doping of the dark material in the reflective film layer 20 reduces the reflectivity of the reflective film layer 20, so that the light irradiated on the reflective film layer 20 passes through the reflective film layer 20, and reduces the lateral etching rate in the development process, so that the longitudinal etching and lateral etching rates tend to be balanced. Figure 1 In the structure shown, in the direction from the protrusion 220 to the central axis O of the opening 210, the thickness L4 of the protrusion 220 is equal; or, the thickness L4 of the protrusion 220 gradually decreases, that is, the thickness L4 of the protrusion 220 close to the central axis O of the opening 210 is smaller than the thickness L4 of the protrusion 220 away from the central axis O of the opening 210, thereby reducing the extension length and mass of the protrusion 220 and reducing the risk of the protrusion 220 falling off and covering the corresponding terminal 30.

[0049] In the display backplane 100 of the present application, please refer to Figure 1 , the ratio of the thickness L4 of the protrusion 220 to the thickness L1 of the reflective film layer 20 is in a range of 0.1 to 0.3.

[0050] In the display backplane 100 of the present application, the dark pigment may include at least one of a basic dye or guaiazulene.

[0051] In the present embodiment, the main material of the reflective film layer 20 is white ink, for example. White ink has a high reflectivity. For example, the reflectivity of white ink with a thickness of 30 microns is between 88% and 90%. When no dark pigment is added, during the exposure process, most of the light irradiated on the reflective film layer 20 is reflected by the reflective film layer 20, and the light in the exposure process cannot penetrate the reflective film layer 20 material at the bottom, so that the film layer material of the reflective film layer 20 close to the driving backplane 10 cannot be cured; after the dark pigment is added, for example, the mass ratio of the dark pigment to the white ink in the reflective material layer is 0.1 to 0.4, the refractive index of the reflective film layer 20 with a thickness of 30 microns can be reduced to 50% to 60%, which greatly reduces the reflectivity of the reflective film layer 20, improves the extension length and quality of the protrusion 220 in the opening 210, and reduces the risk of the protrusion 220 falling off and covering the corresponding terminal 30.

[0052] In the present embodiment, guaiazulene (1,4-dimethyl-7-(1-methylethyl azulene)) is a volatile blue dye, the boiling point of guaiazulene at 7.00 mmHg is 153°C, guaiazulene is stable at room temperature and pressure, and the mixture of guaiazulene and white ink makes the reflective material blue, and when heated to a preset temperature, guaiazulene will volatilize, and the blue color will fade significantly or disappear visually.

[0053] In this embodiment, in order to improve the display uniformity of the display panel, it is usually necessary to set a reflective film with high reflectivity between the light-emitting units. After the dark pigment is added to the white ink of the present application, the reflectivity decreases, resulting in poor display uniformity of the final product. Therefore, in this embodiment, before the white ink is exposed and developed, the dark pigment is added to the white ink for mixing, so as to reduce the reflectivity of the white ink and improve the undercut structure in the opening 210. After the development process is completed, the reflective film layer 20 can be baked at a temperature of 150° C. to 200° C. After the dark pigment volatilizes, the content of the dark pigment in the white ink is reduced, thereby improving the reflectivity of the white ink. In this way, it is possible to ensure that the undercut structure is improved in the process of forming the opening 210 and the display uniformity of the final product is ensured.

[0054] In this embodiment, the basic dye can be mixed with guaiazulene for use, and the boiling point of the basic dye can be between 150° C. and 200° C. or less than this range.

[0055] In the display backplane 100 of the present application, the mass proportion of the dark pigment on the side of the reflective film layer 20 close to the driving backplane 10 is greater than the mass proportion of the dark pigment on the side away from the driving backplane 10 .

[0056] In this embodiment, after the development process of the reflective film layer 20 is completed, the dark pigment in the reflective film layer 20 needs to be removed. However, since the dark pigment is evenly mixed with the white ink, after the reflective film layer 20 is baked at a preset temperature, a portion of the reflective film layer 20 still remains in the reflective film layer 20, and the mass percentage of the dark pigment in the reflective film layer 20 is 0.01% to 0.1%.

[0057] In this embodiment, since the dark pigment overflows from the side of the reflective film layer 20 away from the driving backplane 10, the dark pigment on the side of the reflective film layer 20 away from the driving backplane 10 overflows first, and the dark pigment on the side of the reflective film layer 20 close to the driving backplane 10 overflows later, so that the residual amount of the dark pigment on the side of the reflective film layer 20 close to the driving backplane 10 is greater than the residual amount of the dark pigment on the side away from the driving backplane 10.

[0058] In this embodiment, taking white ink with a thickness of 30 microns as an example, since a small amount of dark pigment remains in the reflective film layer 20, the reflectivity of the reflective film layer 20 is reduced by 0.5% to 1% compared with the white ink without the dark pigment mixed therein.

[0059] In the display backplane 100 of the present application, the driving backplane 10 also includes an insulating film layer in contact with the reflective film layer 20 , the insulating film layer includes the dark pigment, and the mass proportion of the dark pigment in the insulating film layer is less than the mass proportion of the dark pigment in the reflective film layer 20 .

[0060] In this embodiment, the insulating film layer may be an organic insulating material or an inorganic insulating material. In this embodiment, the insulating film layer is taken as the flat layer 107. When the reflective film layer 20 mixed with the dark pigment is coated on the flat layer 107, the dark pigment may penetrate into the flat layer 107. In the subsequent baking process, the dark pigment may remain in the flat layer 107. Since the mass proportion of the dark pigment in the flat layer 107 is small before baking, the mass proportion of the dark pigment in the flat layer 107 is less than the mass proportion of the dark pigment in the reflective film layer 20 after baking.

[0061] The present application reduces the reflectivity of the reflective film layer 20 by adding a dark pigment to the reflective film layer 20, so that the light during exposure can penetrate to the bottom of the reflective film layer 20, so that the bottom material of the reflective film layer 20 is completely cured, and the undercut structure at the position of the opening 210 during development is improved, the extension length and mass of the protrusion 220 are reduced, and the risk of the protrusion 220 falling off and covering the corresponding terminal 30 is reduced.

[0062] See also Figure 3 The present application also proposes a method for preparing a display backplane 100, which comprises:

[0063] S10 , forming a plurality of terminals 30 and a reflective material layer 40 in sequence on the driving backplane 10 , wherein the reflective material layer 40 covers the plurality of terminals 30 , and the reflective material layer 40 includes a dark pigment.

[0064] See also Figure 4a , step S10 may include:

[0065] S101, providing a driving backplane 10.

[0066] In this embodiment, the driving backplane 10 may include a substrate 101 and a thin film transistor layer disposed on the substrate 101. The substrate 101 may be made of materials such as polyimide, glass or quartz.

[0067] In this example, see Figure 2 The thin film transistor layer may include a plurality of thin film transistors, and the thin film transistors may be of an etch barrier type, a back channel etch type, or may be divided into a bottom gate thin film transistor, a top gate thin film transistor, and the like according to the position of the gate electrode and the active layer, and there is no specific limitation.

[0068] S102 , forming a plurality of terminals 30 on the driving backplane 10 .

[0069] In this embodiment, the plurality of terminals 30 may be disposed on the planar layer 107 of the driving backplane 10 , and the plurality of terminals 30 may be electrically connected to the source-drain layer 106 in the driving backplane 10 .

[0070] S103 , forming a reflective material layer 40 on the driving backplane 10 , wherein the reflective material layer 40 covers the plurality of terminals 30 .

[0071] In this embodiment, the reflective material layer 40 may include white ink and dark pigment, and the mass ratio of the dark pigment to the white ink in the reflective material layer 40 may be 0.1 to 0.4. The dark pigment may include at least one of a basic dye or guaiazulene.

[0072] In the present embodiment, guaiazulene (1,4-dimethyl-7-(1-methylethyl azulene)) is a volatile blue dye, the boiling point of guaiazulene at 7.00 mmHg is 153°C, guaiazulene is stable at room temperature and pressure, and the mixture of guaiazulene and white ink makes the reflective material blue, and when heated to a preset temperature, guaiazulene will volatilize, and the blue color will fade significantly or disappear visually.

[0073] In this embodiment, the basic dye can be mixed with guaiazulene for use, and the boiling point of the basic dye can be between 150° C. and 200° C. or less than this range.

[0074] S20 , patterning the reflective material layer 40 to form a plurality of openings 210 corresponding to the plurality of terminals 30 on the reflective material layer 40 .

[0075] See also Figure 4b First, the reflective material layer 40 is exposed using a mask, and then the reflective material layer 40 is developed using a developer to remove the reflective material corresponding to the plurality of terminals 30 to form a plurality of openings 210 on the reflective material layer 40 .

[0076] In this embodiment, the reflective film layer 20 further includes a protrusion 220 extending toward the central axis O of the opening 210 , and the surface of the protrusion 220 away from the driving backplane 10 and the surface of the reflective film layer 20 away from the driving backplane 10 are located on the same plane.

[0077] In this embodiment, the ratio of the dimension of the protrusion 220 extending toward the central axis O of the opening 210 to the thickness of the reflective film layer 20 is in the range of 0.1 to 0.3; and the ratio of the distance between the surface of the terminal 30 away from the driving backplane 10 and the surface of the protrusion 220 close to the terminal 30 to the thickness of the reflective film layer 20 is in the range of 0.1 to 0.3.

[0078] S30, heating the reflective material layer 40 at a preset temperature so that the reflective material layer 40 forms a reflective film layer 20, wherein the preset temperature is greater than the melting point of the dark pigment.

[0079] See also Figure 4c In order to improve the display uniformity of the display panel, it is usually necessary to set a reflective film with high reflectivity between the light-emitting units. After adding dark pigments to the white ink of the present application, the reflectivity decreases, resulting in poor display uniformity of the final product. Therefore, after the development process is completed, the reflective film layer 20 can be baked at a temperature of 150°C to 200°C to remove the dark pigment and restore the high reflectivity of the white ink, which can ensure that the undercut structure is improved in the process of forming the opening 210 and the display uniformity of the final product is guaranteed.

[0080] Finally, the lamp bead can be bonded to the terminal 30, and subsequent packaging or other processes can be completed.

[0081] The present application also proposes a mobile terminal, which includes a terminal body and the above-mentioned display backplane, and the terminal body and the display panel are combined into one. For example, when the display backplane is a backlight source, the terminal body can be a liquid crystal display panel, and the display backplane and the liquid crystal display panel are combined into the mobile terminal; when the display backplane is a direct display device, the terminal body can be a circuit board or other device bound to the display panel and a cover plate covering the display panel. The mobile terminal can include electronic devices such as mobile phones, televisions, and laptops.

[0082] The present application discloses a display backplane and a preparation method thereof, and a mobile terminal; the display backplane comprises a driving backplane, a reflective film layer arranged on the driving backplane, and a plurality of terminals, the reflective film layer comprises a plurality of openings, a plurality of the terminals are arranged in the plurality of the openings, one terminal corresponds to one opening, the thickness of the reflective film layer is greater than the thickness of the terminal, the reflective film layer comprises a dark pigment, and the mass percentage of the dark pigment in the reflective film layer is 0.01% to 0.1%; the present application reduces the reflectivity of the reflective film layer by adding a dark pigment to the reflective film layer, so that the light during exposure can penetrate to the bottom of the reflective film layer, so that the bottom material of the reflective film layer is completely cured, and the reflective film layer at the bottom of the exposure area is prevented from being undercut by the developer during development to form an undercut structure, thereby preventing the protrusion from falling off.

[0083] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] The above is a detailed introduction to a display backplane and a preparation method thereof, and a mobile terminal provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display backplane, characterized in that: include: Driver backplane; A reflective film layer is disposed on the driving back plate, the reflective film layer includes a plurality of openings, and the reflective film layer also includes a protrusion disposed on the side wall of the opening and extending toward the central axis of the opening, and a surface of the protrusion away from the driving back plate and a surface of the reflective film layer away from the driving back plate are located on the same plane; A plurality of terminals are arranged on the driving backplane, the plurality of terminals are arranged in the plurality of openings, one terminal corresponds to one opening, and the thickness of the reflective film layer is greater than the thickness of the terminal; Among them, the reflective film layer includes a dark pigment, the mass percentage of the dark pigment in the reflective film layer is 0.01% to 0.1%, and the mass percentage of the dark pigment on the side of the reflective film layer close to the driving backplane is greater than the mass percentage of the dark pigment on the side away from the driving backplane.

2. The display backplane according to claim 1, characterized in that: The ratio of the length of the protrusion extending toward the central axis of the opening to the thickness of the reflective film layer is in a range of 0.1 to 0.

3.

3. The display backplane according to claim 2, characterized in that: In the direction of the protrusion from the side wall of the opening to the central axis of the opening, the thickness of the protrusion gradually decreases or the thickness of the protrusion is equal.

4. The display backplane according to claim 3, characterized in that: The ratio of the thickness of the protrusion to the thickness of the reflective film layer is in a range of 0.1 to 0.

3.

5. The display backplane according to any one of claims 1 to 4, characterized in that: The dark pigment includes at least one of a basic dye or guaiazulene.

6. The display backplane according to any one of claims 1 to 4, characterized in that: The driving backplane further comprises an insulating film layer in contact with the reflective film layer, and the insulating film layer comprises the dark pigment; The mass proportion of the dark pigment in the insulating film layer is smaller than the mass proportion of the dark pigment in the reflective film layer.

7. A method for preparing a display backplane according to any one of claims 1 to 6, characterized in that: include: A plurality of terminals and a reflective material layer are sequentially formed on the driving backplane, wherein the reflective material layer covers the plurality of terminals, and the reflective material layer includes a dark pigment; Performing patterning on the reflective material layer to form a plurality of openings corresponding to the plurality of terminals on the reflective material layer; heating the reflective material layer at a preset temperature so that the reflective material layer forms a reflective film layer; Wherein, the preset temperature is greater than the melting point of the dark pigment.

8. The method for preparing a display backplane according to claim 7, characterized in that: The reflective material layer further includes white ink, and a mass ratio of the dark pigment to the white ink in the reflective material layer is 0.1 to 0.

4.

9. A mobile terminal, characterized in that: The mobile terminal comprises the display back panel according to any one of claims 1 to 6.

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