Display panel, preparation method of display panel and display device

Abstract

The invention discloses a display panel, a preparation method of the display panel and a display device, and relates to the technical field of display, the display panel comprises a first substrate, a second substrate and a spacer, the first substrate and the second substrate are oppositely arranged, and the spacer is arranged on the first substrate and faces the second substrate. The second substrate comprises a substrate, a plurality of black matrixes and a plurality of transparent electrode layers, the black matrixes are arranged on the substrate at intervals, the sides, away from the substrate, of the black matrixes are covered with the transparent electrode layers, and the transparent electrode layers and the black matrixes are arranged in a one-to-one correspondence mode; a limiting structure is formed on the surface of the side, away from the black matrix, of the transparent electrode layer, the limiting structure corresponds to the spacer, and the surface, facing the second substrate, of the spacer at least abuts against part of the limiting structure; through the design, poor display is avoided.

Description

Technical Field

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

[0002] With the advancement of display technology and people's increasing demands for a better visual experience, curved displays are becoming a mainstream choice for office, gaming, and entertainment. Curved displays, with their slightly curved screens, offer a better surround viewing experience, simulating glasses-free 3D visuals. With a wider viewing angle, curved displays feel larger and offer a panoramic experience. Their curved edges also conform to the human eye, providing a more comfortable viewing experience.

[0003] During the actual manufacturing process of curved displays, the flat display screens are bent and fixed to a fixed curvature by bending the backlight module, thus achieving the curved effect. However, the columnar post spacers (PS), formed through the photolithography process to maintain the gap between the array substrate and the color filter substrate (i.e., the thickness of the liquid crystal cell), have the advantages of uniform distribution and fixed position in a flat state. However, in a curved state, they become a problem that affects display quality: in this state, the PS shifts due to bending stress, which can easily cause display problems such as bubbles and mura in the liquid crystal, and also lead to severe color shift in the viewing angle. Summary of the Invention

[0004] The purpose of the present application is to provide a display panel, a method for manufacturing a display panel, and a display device that avoids display defects.

[0005] The present application discloses a display panel, comprising a first substrate and a second substrate arranged opposite to each other, and a spacer arranged on the first substrate facing the second substrate, the second substrate comprising a substrate, a plurality of black matrices and a plurality of transparent electrode layers, the plurality of black matrices being arranged at intervals on the substrate, the transparent electrode layer covering a side of the black matrix away from the substrate and being arranged in a one-to-one correspondence with the black matrix, wherein a limiting structure is formed on a surface of the transparent electrode layer on a side away from the black matrix, the limiting structure being arranged corresponding to the spacer, and the surface of the spacer facing the second substrate at least abuts against a portion of the limiting structure.

[0006] Optionally, the limiting structure includes a rough structure formed on the surface of the transparent electrode layer, and an orthographic projection area of the rough structure on the second substrate is larger than an orthographic projection area of the spacer on the second substrate.

[0007] Optionally, the limiting structure includes a rough structure and a groove structure, the surface of the transparent electrode layer is divided into a first limiting area and a second limiting area arranged adjacent to each other, the groove structure is arranged in the first limiting area, the rough structure is arranged in the groove structure and the second limiting area; the spacer is arranged corresponding to the groove structure.

[0008] Optionally, the cross-section of the groove structure is an inverted trapezoidal structure.

[0009] Optionally, the groove depth of the groove structure is 0.5μm-0.8μm, and the groove depth of the groove structure is H1, and the height of the spacer is H2, wherein 1 / 3H2≦H1≦1 / 2H2; the width of the groove surface of the groove structure and the width of the groove bottom of the groove structure are both greater than the diameter of the spacer.

[0010] Optionally, the groove structure includes a first groove and a second groove, and the spacer includes a main spacer and an auxiliary spacer, the main spacer is arranged corresponding to the first groove, and part of the main spacer is located in the first groove, and the auxiliary spacer is arranged corresponding to the second groove, and part of the auxiliary spacer is located in the second groove.

[0011] Optionally, the second substrate further includes a hydrophobic active layer and a surface active layer, the hydrophobic active layer is arranged on the side of the transparent electrode layer away from the substrate, and the surface active layer is arranged on the side of the hydrophobic active layer away from the substrate; wherein the thickness of the surface active layer is 20nm-150nm.

[0012] Optionally, the second substrate further includes a microlens structure, and the microlens structure is arranged on the substrate and located between two adjacent black matrices.

[0013] Optionally, the microlens structure includes a plurality of sub-microlens units arranged in an array, and the arch height of each sub-microlens unit is equal.

[0014] The present application also discloses a method for preparing a display panel, which is used for the display panel described above, comprising the steps of:

[0015] providing a first substrate;

[0016] forming spacers on the first substrate;

[0017] providing a substrate;

[0018] coating a black matrix material on the substrate to form a plurality of black matrices arranged at intervals;

[0019] coating a transparent electrode material corresponding to the black matrix to form a transparent electrode layer above the black matrix;

[0020] Treating the surface of the transparent electrode layer with gas to form an uneven limiting structure on the surface of the transparent electrode layer to form a second substrate;

[0021] Aligning the first substrate and the second substrate to form a display panel;

[0022] The limiting structure is arranged corresponding to the spacer, and the surface of the spacer facing the second substrate is in contact with at least a portion of the limiting structure.

[0023] The present application also discloses a display device, comprising the display panel as described above and a backlight module, wherein the backlight module is arranged on one side of the display panel to provide a backlight source for the display panel.

[0024] Compared with the prior art, in which the display panel is in a curved state, the PS is displaced due to bending stress, and the liquid crystal is prone to display problems such as bubbles and mura. The second substrate of the display panel of the present application includes a substrate, multiple black matrices and multiple transparent electrode layers. The multiple black matrices are arranged at intervals on the substrate, and the transparent electrode layer covers the side of the black matrix away from the substrate and is arranged one-to-one with the black matrix. A limiting structure is formed on the surface of the transparent electrode layer away from the black matrix, and the limiting structure is arranged corresponding to the spacer, and the surface of the spacer facing the second substrate is at least in contact with part of the limiting structure. In this way, when the display panel is bent and fixed, the bending stress acts on the spacer, squeezing the spacer toward the direction close to the second substrate. In this way, a limiting effect is formed between the limiting structure and the surface of the spacer facing the second substrate to prevent the position of the spacer from shifting, thereby avoiding display problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0026] Figure 1 is a schematic block diagram of a display device provided in an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of the cross-sectional structure of a display panel provided in an embodiment of the present application;

[0028] Figure 3 yes Figure 2 Schematic diagram of the local enlarged structure of area A in the middle;

[0029] Figure 4 This is a schematic structural diagram of the upper limit structure of the transparent electrode layer provided in an embodiment of the present application;

[0030] Figure 5 Schematic diagram of the principle of the microlens structure provided by the embodiment of the present application;

[0031] Figure 6 is a schematic flow chart of a method for manufacturing a display panel provided in an embodiment of the present application;

[0032] Figure 7 yes Figure 6 Schematic diagram of the further steps of step S6;

[0033] Figure 8 yes Figure 7 Schematic diagram of the steps after step S63;

[0034] Figure 9 yes Figure 8 Schematic diagram of the steps after step S9 in FIG.

[0035] Among them, 10, display device; 100, display panel; 110, first substrate; 120, second substrate; 121, underlay; 122, black matrix; 123, transparent electrode layer; 124, limiting structure; 125, rough structure; 126, groove structure; 127, first limiting area; 128, second limiting area; 129, first groove; 130, second groove; 140, spacer; 141, main spacer; 142, auxiliary spacer; 150, microlens structure; 151, sub-microlens unit; 200, backlight module. DETAILED DESCRIPTION

[0036] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0037] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, features defined as "first" and "second" may explicitly or implicitly include one or more of such features; "multiple" means two or more. In addition, terms indicating orientation or positional relationships such as "up", "down", "left", "right", "second direction", and "first direction" are based on the orientation or relative positional relationships shown in the accompanying drawings. They are only simplified descriptions for the convenience of describing this application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0039] Example:

[0040] Figure 1 is a block diagram of the display device provided by this application, Figure 2 is a schematic diagram of the cross-sectional structure of the display panel provided in this application, such as Figure 1-Figure 2 As shown, the present application discloses a display device 10, including a display panel 100, wherein the display panel 100 includes a first substrate 110 and a second substrate 120 arranged opposite to each other, and a spacer 140 arranged on the first substrate 110 facing the second substrate 120, characterized in that the second substrate 120 includes a substrate 121, a plurality of black matrices 122 and a plurality of transparent electrode layers 123, a plurality of the black matrices 122 are arranged at intervals on the substrate 121, and the transparent electrode layer 123 covers the side of the black matrix 122 away from the substrate 121, and is arranged one-to-one with the black matrix 122, wherein a limiting structure 124 is formed on the surface of the side of the transparent electrode layer 123 away from the black matrix 122, the limiting structure 124 is arranged corresponding to the spacer 140, and the surface of the spacer 140 facing the second substrate 120 is in contact with at least part of the limiting structure 124.

[0041] Compared with the prior art, in which the display panel 100 is in a curved state, the PS is offset due to bending stress, and the liquid crystal is prone to display problems such as bubbles and mura. The second substrate 120 of the display panel 100 of the present application includes a substrate 121, a plurality of black matrices 122 and a plurality of transparent electrode layers 123. The plurality of black matrices 122 are arranged on the substrate 121 at intervals. The transparent electrode layer 123 covers the side of the black matrix 122 away from the substrate 121 and is arranged one-to-one with the black matrix 122. The transparent electrode layer 123 is away from the black matrix. A limiting structure 124 is formed on one side surface of 122, and the limiting structure 124 is arranged corresponding to the spacer 140, and the surface of the spacer 140 facing the second substrate 120 is at least in contact with part of the limiting structure 124. In this way, when the display panel 100 is bent and fixed, the bending stress acts on the spacer 140, squeezing the spacer 140 in the direction close to the second substrate 120. In this way, a limiting effect is formed between the limiting structure 124 and the surface of the spacer 140 facing the second substrate 120, preventing the spacer 140 from shifting, thereby avoiding the problem of poor display.

[0042] Specifically, such as Figure 2 As shown, the limiting structure 124 includes a rough structure 125 formed on the surface of the transparent electrode layer 123, and the area of the orthographic projection of the rough structure 125 on the second substrate 121 is larger than the area of the orthographic projection of the spacer 140 on the second substrate 121. The direction along the first black matrix 122 points to the second black matrix 122. The transparent electrode layer 123 includes a first surface, a second surface and a third surface. The first surface and the third surface are arranged opposite to each other, and the second surface is arranged between the first surface and the third surface. The rough structure 125 is arranged on the second surface and covers the entire second surface. In this way, when in the curved state, after the spacer 140 is squeezed, it abuts against the rough structure 125 toward the bottom surface of the second substrate 120, and friction stress is generated between the rough structure 125, which blocks the sliding of the spacer 140 to ensure that the spacer 140 can play its role normally.

[0043] The rough structure 125 is formed by applying a high-pressure inert gas, such as Ar / He, to the surface of the transparent electrode layer 123 after the transparent electrode layer 123 is coated and etched. This increases the surface roughness of the transparent electrode layer 123. Specific parameters include: power: 15-30K, flow rate: 5000-15000 sccm, and time: 10-30 min. This can increase the surface roughness of the ITO and enhance the adhesion between PS and ITO. The rough structure 125 can be measured by an atomic force microscope.

[0044] Figure 3 yes Figure 2 Schematic diagram of the local enlarged structure of area A in the middle. Figure 4 Schematic diagram of the upper limit structure of the transparent electrode layer provided in the embodiment of the present application. Figure 3-Figure 4 As shown, the limiting structure 124 also includes a groove structure 126, and the surface of the transparent electrode layer 123 is divided into a first limiting area 127 and a second limiting area 128 arranged adjacent to each other. The groove structure 126 is arranged in the first limiting area 127, and the rough structure 125 is arranged in the groove structure 126 and the second limiting area 128. The spacer 140 is arranged corresponding to the groove structure 126, that is, through the combination of the rough structure 125 and the groove structure 126, the spacer 140 is further limited. Even if the spacer 140 is detached from the groove structure 126 during the bending process of the display panel 100, the friction force can be generated by the rough structure 125 of the second limiting area 128 and the lower surface of the spacer 140 to prevent the spacer 140 from continuing to slide.

[0045] Specifically, along the arrangement direction of the black matrix 122, the cross-section of the groove structure 126 is an inverted trapezoidal structure, thus forming a structure that is wide at the top and narrow at the bottom. Due to the extrusion stress after bending, after the spacer 140 is further limited by being stuck in the groove structure 126, the lower surface of the spacer 140 abuts against the rough structure 125, which will produce a certain deformation. If the curvature of the bending has not yet reached the standard, it is necessary to continue bending. The bending stress continues to act on the spacer 140, which may cause the spacer 140 to slide. At this time, the two side edges of the groove structure 126 not only limit the spacer 140, but also play a certain role in buffering stress, so that the spacer 140 can have a certain bending space in the groove structure 126 to avoid the problem of the spacer 140 falling off.

[0046] The groove depth of the groove structure 126 is 0.5 μm-0.8 μm, and the groove depth of the groove structure 126 is H1, and the height of the spacer 140 is H2, wherein 1 / 3H2≦H1≦1 / 2H2, while limiting the spacer 140, prevent the spacer 140 from bending excessively and falling off. For example, when the curvature is R1000, the groove depth can be 0.8 μm, when the curvature is R1500, the groove depth can be 0.6 μm, and when the curvature is R1800, the groove depth can be 0.5 μm.

[0047] Assuming the groove depth of the groove structure 126 is H1 and the height of the spacer 140 is H2, where 1 / 3H2≦H1≦1 / 2H2, the width of the groove surface and the width of the groove bottom of the groove structure 126 are both greater than the diameter of the spacer 140. This means that in addition to accommodating the spacer 140, there is also excess space to cushion the deformation of the spacer 140, thereby preventing the spacer 140 from breaking due to insufficient deformation space after being compressed. The diameter of the groove structure 126 is 2μm-3μm larger than the diameter of the spacer 140 on one side.

[0048] In addition, the groove structure 126 includes a first groove 129 and a second groove 130, and the spacer 140 includes a main spacer 141 and an auxiliary spacer 142. The main spacer 141 is arranged corresponding to the first groove 129, and part of the main spacer 141 is embedded in the first groove 129. The auxiliary spacer 142 is arranged corresponding to the second groove 130, and part of the auxiliary spacer 142 is embedded in the second groove 130. Assuming the height of the main spacer 141 is h1, and the height of the auxiliary spacer 142 is h2, the height of the main spacer 141 embedded in the first groove 129 is 1 / 6h1-1 / 5h1, and the height of the auxiliary spacer 142 embedded in the second groove 130 is 1 / 6h2-1 / 5h2. On the one hand, it can ensure that the main spacer 141 and the auxiliary spacer 142 are limited by the groove structure 126 to ensure that they are not easy to slide when the display panel 100 is bent. On the other hand, the embedded spacer 140 is not too high, so that the main spacer 141 and the auxiliary spacer 142 have elastic space. Even if they slip out of the groove structure 126, they can still be limited by the rough structure 125 on the surface of the transparent electrode layer 123.

[0049] Of course, it is also possible to form the rough structure 125 only on the surface of the transparent electrode layer 123 and utilize the rough structure 125 to enhance the friction between the contact surface and the spacer 140. Alternatively, the rough structure 125 is only provided in the first limiting area 127, while the rough structure 125 is not provided in the groove structure 126. In this way, if the spacer 140 is separated from the groove structure 126 under the action of bending stress, friction stress can be generated between the first limiting area 127 and the rough structure 125 to prevent the spacer 140 from continuing to slide. The specific design depends on production requirements and is not limited here.

[0050] The second substrate 120 further includes a hydrophobic active layer and a surface active layer (not shown in the figure). The hydrophobic active layer is arranged on the side of the transparent electrode layer 123 away from the substrate 121. Since the transparent electrode layer 123 has strong water absorption, after the transparent electrode layer 123 process is completed, adding a layer of hydrophobic active agent can effectively prevent the transparent electrode layer 123 from undergoing quality changes. Then, a surface active layer is plated, which can serve as an intermediate transition layer to increase the interface bonding ability between the transparent electrode layer 123 and the spacer 140. The surface active layer can be formed by a rotary spraying method. In order not to affect the supporting capacity of the spacer 140, the thickness of the surface active layer is 20nm-150nm.

[0051] The material of the surface active layer can be made of one of N-lauroyl sarcosine sodium, N-acyl glutamic acid, N-acyl-L-lysine, etc., and the material of the hydrophobic active layer can be made of silicone resin, fluorocarbon polymer, polyolefin, etc.

[0052] like Figure 2 As shown, the second substrate 120 further includes a microlens structure 150 for preventing the output light source from being fully reflected, thereby improving its visual quality. The microlens structure 150 is disposed on the substrate 121 and is located between two adjacent black matrices 122. The microlens structure 150 completely fills the area between the two adjacent black matrices 122, thereby fully extracting the light source of the display panel 100 to the outside.

[0053] Figure 5 Schematic diagram of the principle of the microlens structure provided by the embodiment of the present application. Figure 5 As shown, the microlens structure 150 is composed of a plurality of sub-microlens units 151, and the light-emitting surface of each sub-microlens unit 151 is in the shape of an arch bridge. Figure 5 The arrows in the figure represent the light emitted by the backlight module 200. When the light is emitted obliquely and reaches the arch bridge surface of the sub-microlens unit 151, it can be refracted by the arch bridge surface. The direction of the refracted light is concentrated and relatively vertically upward. This can reduce the reflected light, make the outgoing light converge, increase the transmitted light, and thus improve the viewing angle.

[0054] Materials suitable for fabricating the microlens structure 150 include commonly used materials such as polydimethylsiloxane (PDMS), polymethyl methacrylate (PMMA), photoresist, and silicon dioxide (SiO2). PDMS is a silicon-containing thermosetting polymer characterized by low surface energy and hydrophobicity, exhibiting excellent mechanical and thermal properties at high temperatures while providing a smooth surface finish. Furthermore, it prevents the polymer from adhering to the mold surface during the separation process, facilitating mold release. PDMS also exhibits excellent transmittance in the visible light region (400nm-700nm), exceeding 93%. Therefore, the microlens structure 150 is preferably fabricated from PDMS. Using a droplet jetting process or electrohydrodynamic printing, the diameter of the microlens structure 150 can be as low as tens of micrometers, with a thickness of approximately 1.0μm to 1.2μm.

[0055] Moreover, the arch heights of the arched bridge-shaped light-emitting surfaces of each of the sub-microlens units 151 are equal. In this way, after the display panel 100 is bent to form a curved screen, the arch heights of the light-emitting surfaces of the sub-microlens units 151 in the non-display area relatively close to the display panel 100 are relatively higher than the arch heights of the light-emitting surfaces of the sub-microlens units 151 close to the display area. In this way, after the emitted light reaches the sub-microlens units 151 close to the non-display area, it is gathered by the light-emitting surfaces of this part of the sub-microlens units 151 at this position, and part of the light is emitted to the edge of the curved screen, thereby increasing the brightness of the curved screen with a relatively high edge curvature and further improving the wide-viewing angle visual experience.

[0056] Figure 6 is a flow chart of a method for manufacturing a display panel provided in an embodiment of the present application, such as Figure 6 As shown, the present application also discloses a method for preparing a display panel, which is used for the display panel as described above, comprising the steps of:

[0057] S1: providing a first substrate;

[0058] S2: forming spacers on the first substrate;

[0059] S3: providing a substrate;

[0060] S4: coating a black matrix material on the substrate to form a plurality of black matrices arranged at intervals;

[0061] S5: coating a transparent electrode material corresponding to the black matrix to form a transparent electrode layer above the black matrix;

[0062] S6: processing the surface of the transparent electrode layer using a corresponding process to form an uneven limiting structure on the surface of the transparent electrode layer to form a second substrate;

[0063] S7: aligning the first substrate and the second substrate to form a display panel;

[0064] The limiting structure is arranged corresponding to the spacer, and the surface of the spacer facing the second substrate is in contact with at least a portion of the limiting structure.

[0065] Figure 7 yes Figure 6 A further step flow diagram of step S6 is shown in FIG. Figure 7 As shown, the step of processing the surface of the transparent electrode layer using a process corresponding to the process so that the surface of the transparent electrode layer forms an uneven limiting structure to form the second substrate further includes the steps of:

[0066] S61: Dividing the surface of the transparent electrode layer into a first limiting area and a second limiting area;

[0067] S62: forming a groove structure corresponding to the second limiting area;

[0068] S63: Processing the surfaces of the first limiting area and the second limiting area using a process to form a rough structure.

[0069] Among them, the process of using the surface of the transparent electrode layer to form an uneven limiting structure on the surface of the transparent electrode layer to form a second substrate includes using high-pressure inert gas, Power: 15-30K, flow rate 5000-15000sccm, time 10-30min, to impact the surface of the transparent electrode layer to form a rough structure on the surface of the transparent electrode layer.

[0070] Figure 8 yes Figure 7 The flowchart of the steps after step S63 is as follows: Figure 8 As shown, after the step of processing the surfaces of the first limiting area and the second limiting area using a process to form a rough structure, the step further includes:

[0071] S8: coating a hydrophobic active material on the transparent electrode layer to form a hydrophobic active layer;

[0072] S9: coating a surface active material on the hydrophobic active layer to form a surface active layer.

[0073] In this way, a protective transition layer is formed above the transparent electrode layer, further increasing the interface bonding ability between the transparent electrode layer and the spacer.

[0074] Figure 9 yes Figure 8 The flowchart of the steps after step S9 is as follows: Figure 9 As shown, after the step of coating the surface active material on the hydrophobic active layer to form the surface active layer, the method further includes the following steps:

[0075] S10: forming a microlens structure in a region between two adjacent black matrices on the substrate using a process.

[0076] Among them, the first substrate is an array substrate, the second substrate is a color filter substrate, and the array substrate also includes the preparation of film layers such as a metal layer, an insulating layer, a color resist layer and a transparent electrode layer. The preparation of these film layers does not belong to the invention focus of this application and will not be described here.

[0077] It should be noted that the limitations on the steps involved in this solution do not limit the order of the steps without affecting the implementation of the specific solution. The steps written in front can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0078] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0079] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A display panel comprising a first substrate and a second substrate disposed opposite to each other, and a spacer disposed on the first substrate and facing the second substrate, wherein: The second substrate includes a substrate, multiple black matrices and multiple transparent electrode layers, the multiple black matrices are arranged at intervals on the substrate, the transparent electrode layer covers the side of the black matrix away from the substrate, and is arranged one-to-one with the black matrix, wherein a limiting structure is formed on the surface of the side of the transparent electrode layer away from the black matrix, the limiting structure is arranged corresponding to the spacer, and the surface of the spacer facing the second substrate at least abuts against part of the limiting structure.

2. The display panel according to claim 1, wherein The limiting structure includes a rough structure formed on the surface of the transparent electrode layer, and the area of the orthographic projection of the rough structure on the second substrate is larger than the area of the orthographic projection of the spacer on the second substrate.

3. The display panel according to claim 1, wherein The limiting structure includes a rough structure and a groove structure, and the surface of the transparent electrode layer is divided into a first limiting area and a second limiting area that are adjacent to each other. The groove structure is arranged in the first limiting area, and the rough structure is arranged in the groove structure and the second limiting area. The spacers are arranged corresponding to the groove structures.

4. The display panel according to claim 3, wherein: The cross section of the groove structure is an inverted trapezoidal structure.

5. The display panel according to claim 4, wherein: The groove depth of the groove structure is 0.5 μm-0.8 μm, and the groove depth of the groove structure is H1, and the height of the spacer is H2, wherein 1 / 3H2≦H1≦1 / 2H2; The width of the groove surface of the groove structure and the width of the groove bottom of the groove structure are both greater than the diameter of the spacer.

6. The display panel according to claim 5, wherein: The groove structure includes a first groove and a second groove, and the spacer includes a main spacer and an auxiliary spacer. The main spacer is arranged corresponding to the first groove, and part of the main spacer is embedded in the first groove. The auxiliary spacer is arranged corresponding to the second groove, and part of the auxiliary spacer is embedded in the second groove.

7. The display panel according to claim 2 or 3, wherein: The second substrate further includes a microlens structure, which is disposed on the substrate and located between two adjacent black matrices.

8. The display panel according to claim 7, wherein: The microlens structure includes a plurality of sub-microlens units arranged in an array, and the arch height of each sub-microlens unit is equal.

9. A method for preparing a display panel, for preparing the display panel according to any one of claims 1 to 8, characterized in that: Including steps: providing a first substrate; forming spacers on the first substrate; providing a substrate; coating a black matrix material on the substrate to form a plurality of black matrices arranged at intervals; coating a transparent electrode material corresponding to the black matrix to form a transparent electrode layer above the black matrix; Treating the surface of the transparent electrode layer with gas to form an uneven limiting structure on the surface of the transparent electrode layer to form a second substrate; Aligning the first substrate and the second substrate to form a display panel; The limiting structure is arranged corresponding to the spacer, and the surface of the spacer facing the second substrate is in contact with at least a portion of the limiting structure.

10. A display device, characterized in that: It comprises the display panel according to any one of claims 1 to 8 and a backlight module, wherein the backlight module is arranged on one side of the display panel to provide a backlight source for the display panel.

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