Display module and preparation method therefor, and display apparatus

Abstract

Provided in the present disclosure are a display module and a preparation method therefor, and a display apparatus. The display module comprises a display panel, an encapsulation layer, a patterned black photoresist layer and a patterned color resist layer, which are stacked in sequence, a cathode of the display panel being patterned. The display panel comprises pixel regions and connection regions, wherein the pixel regions correspond to pixel units in the display panel; and the connection regions are used for connecting the pixel regions, such that there is at least one communication path between any two pixel regions. The orthographic projection of the patterned black photoresist layer and the orthographic projection of the patterned color resist layer on the display panel respectively cover the connection regions and regions occupied by the pixel units. In the present disclosure, by means of the design of patterning a cathode of a display panel, the patterned shapes of a black photoresist layer and a color resist layer are determined, such that the optimized structure reduces the coverage area of the black photoresist layer on edges of pixels while reducing the reflectivity of the display panel, thereby reducing brightness decay at an angle of view of the panel and improving the usage experience of a user.

Description

Display module, manufacturing method thereof, and display device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display module and a manufacturing method thereof, and a display device. Background Art

[0002] In recent years, AMOLED panels have garnered increasing attention and favor due to their wider color gamut, higher contrast, improved color purity, and flexible foldability. This has led to an increasing demand for higher panel brightness. To achieve a larger aperture ratio, most existing OLED devices employ a top-emitting configuration. While this improves light extraction efficiency, it also significantly increases the panel's reflectivity, necessitating the introduction of a polarizer structure to reduce reflections. However, this configuration reduces the panel's RGB dominant wavelength transmittance to approximately 50%, significantly impacting panel brightness. Therefore, seeking alternative polarizer structures is crucial given current demand.

[0003] In an optimization scheme of the prior art, a COE (Color filter On Encapsulation) structure is provided to replace the polarizer structure. Specifically, the COE structure includes coating a layer of color filter (CF, Color Filter) on top of the encapsulated display panel, so that each pixel unit has a color filter corresponding to the color of the pixel above, and the gaps between the pixel units are blocked by a black matrix layer (BM, Black Matrix). It can be understood that this COE structure can solve the reflection and light transmittance problems of the display screen: for the incident light from the outside, the unnecessary part will be directly absorbed by the black matrix layer, and the part that is incident through the color filter will either be reflected as the corresponding pixel color or blocked by the black matrix layer or other color filters. At the same time, the color filter has a high transmittance for the main wavelength of RGB (about 70% to 90%, which is much higher than the main wavelength transmittance of the polarizer structure).

[0004] However, since the black matrix layer covers the gaps between the pixel units, the viewing angle brightness of the display panel is greatly attenuated, resulting in a poor viewing angle visualization effect of the display screen, affecting the user's viewing experience.

[0005] Summary of the Invention

[0006] In response to the problems in the prior art, the purpose of the present disclosure is to provide a display module and a preparation method thereof, and a display device, which reduce the reflectivity while improving the phenomenon that the black photoresist layer significantly attenuates the viewing angle brightness of the display panel, thereby overcoming the problems raised in the prior art.

[0007] Specifically, a first aspect of the present disclosure provides a display module comprising a display panel, an encapsulation layer, a patterned black photoresist layer, and a patterned color photoresist layer stacked in sequence;

[0008] The display panel includes a plurality of pixel units and a patterned cathode layer, wherein the patterned cathode layer includes a plurality of pixel regions and a connection region, wherein:

[0009] The pixel areas correspond to the pixel units one by one, and the orthographic projection of each pixel area covers the area occupied by the corresponding pixel unit;

[0010] The connection area is used to connect the pixel areas so that there is at least one connection path between any two pixel areas;

[0011] The orthographic projection of the black photoresist covering area of ​​the patterned black photoresist layer on the display panel covers the connection area;

[0012] The orthographic projection of the color photoresist coverage area of ​​the patterned color photoresist layer on the display panel covers the areas occupied by all pixel units.

[0013] In a possible implementation of the first aspect, the gap region of the patterned cathode layer is covered by an organic cathode patterning material.

[0014] In a possible implementation of the first aspect above, the orthographic projection of the pixel area coincides with an area occupied by the corresponding pixel unit.

[0015] In a possible implementation of the first aspect, the connection area includes a plurality of connection strips;

[0016] The width of the connecting strip is smaller than the length of the shortest side of the pixel unit;

[0017] Each connecting strip is placed between two adjacent pixel areas.

[0018] In a possible implementation of the first aspect, the black photoresist coverage area includes a plurality of black photoresist strips, and the black photoresist strips correspond to the connecting strips one-to-one;

[0019] The width of the black photoresist strip is greater than or equal to the width of the connecting strip.

[0020] A second aspect of the present disclosure provides a method for preparing a display module, which may specifically include the following steps:

[0021] A display panel having a patterned cathode layer and a plurality of pixel units is provided, wherein the patterned cathode layer includes a plurality of pixel regions and a connection region, wherein the pixel regions correspond one to one with the pixel units, and the connection region is used to connect the pixel regions so that at least one connection path exists between any two pixel regions;

[0022] preparing an encapsulation layer on the patterned cathode layer;

[0023] Preparing a patterned black photoresist layer on the encapsulation layer so that the orthographic projection of the black photoresist covered area on the display panel covers the connection area;

[0024] A patterned color photoresist layer is prepared on the patterned black photoresist layer so that the orthographic projection of the color photoresist coverage area on the display panel covers the area occupied by all pixel units.

[0025] In a possible implementation of the second aspect, providing a display panel having a patterned cathode layer and a plurality of pixel units includes:

[0026] Using a fine mask, an organic cathode patterning material is evaporated onto the cover layer of the display panel;

[0027] Vapor-depositing a cathode material on the organic cathode patterned material to form a patterned cathode layer;

[0028] The cathode coverage area of ​​the fine mask and the patterned cathode layer is consistent.

[0029] In a possible implementation of the second aspect, the process of preparing the patterned color photoresist layer on the patterned black photoresist layer includes:

[0030] sequentially preparing a patterned red photoresist layer, a patterned green photoresist layer, and a patterned blue photoresist layer on the patterned black photoresist layer;

[0031] The orthographic projection of the patterned red photoresist layer on the display panel corresponds to the distribution position of the red pixel units;

[0032] The orthographic projection of the patterned green photoresist layer on the display panel corresponds to the distribution position of the green pixel units;

[0033] The orthographic projection of the patterned blue photoresist layer on the display panel corresponds to the distribution position of the blue pixel units.

[0034] In a possible implementation of the second aspect above, the preparation method further includes:

[0035] A protective layer is prepared on the patterned color photoresist layer.

[0036] A third aspect of the present disclosure provides a display device, comprising the display module provided by the first aspect.

[0037] Compared with the prior art, the present disclosure has the following beneficial effects:

[0038] The technical solution provided in the present disclosure provides a patterned COE (Color Filter On Encapsulation) structure. By designing the cathode of a patterned display panel, the patterned shapes of the black photoresist layer and the color photoresist layer in the COE structure are determined. The optimized patterned COE structure effectively reduces the reflectivity of the display panel while reducing the coverage area of ​​the color photoresist layer at the edge of the pixel, thereby improving the viewing angle brightness attenuation of the panel and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features, objects and advantages of the present disclosure will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0040] FIG1 is a schematic diagram of a cross-sectional structure of a display module according to an embodiment of the present disclosure.

[0041] FIG2 is a schematic structural diagram of a patterned cathode layer on its plane according to an embodiment of the present disclosure.

[0042] FIG3 a provides a schematic structural diagram of another patterned cathode layer on its plane according to an embodiment of the present disclosure.

[0043] FIG3 b provides a schematic structural diagram of another patterned cathode layer on its plane according to an embodiment of the present disclosure.

[0044] FIG4 is a schematic structural diagram of a display module at a section formed by dashed lines C and D in FIG2 according to an embodiment of the present disclosure.

[0045] FIG5 is a schematic diagram of a process for preparing a display module according to an embodiment of the present disclosure.

[0046] FIG6 is a schematic diagram of a process for providing a display panel with a patterned cathode layer and a plurality of pixel units according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through different specific embodiments. The details in the present application can also be modified or changed according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0048] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in many different forms and is not limited to the embodiments described herein.

[0049] In the description of this application, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this application, as well as features of different embodiments or examples, unless otherwise contradictory.

[0050] In addition, the terms "first" and "second" are used only for representational purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Although the terms "first", "second" and the like are used in some instances herein to indicate various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. Furthermore, as used in this article, the singular forms "one", "an" and "the" are intended to also include plural forms, unless otherwise indicated in the context.

[0051] In order to clearly describe the present application, components not related to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0052] Throughout this specification, when a device is said to be "connected" to another device, this includes not only "direct connection" but also "indirect connection" with other elements interposed therebetween. Furthermore, when a device is said to "include" a certain component, unless otherwise stated, this does not exclude the inclusion of other components but rather implies that the device may include other components.

[0053] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly on" another device, there are no other devices between it.

[0054] It should be further understood that the terms "comprises" and "includes" indicate the presence of features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition occur only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way. "Comprises" as used in the specification means to concretize specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0055] Although not defined differently, all terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art to which this application belongs. Terms defined in commonly used dictionaries are to be interpreted as having meanings consistent with the relevant technical literature and current teachings, and unless otherwise defined, they should not be overly interpreted as ideal or highly formalized meanings.

[0056] It is understandable that, as described in the aforementioned prior art, although the use of a COE structure instead of a polarizer structure can solve the reflection and light transmittance problems of the display screen, since the black matrix layer covers the intervals between the pixel units, the viewing angle brightness of the display panel is greatly attenuated and the viewing angle visualization effect of the display screen is deteriorated, affecting the user's viewing experience. In order to overcome the above-mentioned defects and further optimize the COE structure, the present disclosure provides a display module and its preparation method, and a display device, which can improve the phenomenon of the black photoresist layer significantly attenuating the viewing angle brightness of the display panel while ensuring the benefits of the COE structure. The technical solutions involved in the present disclosure will be specifically explained and described below:

[0057] Specifically, in some embodiments of the present disclosure, FIG1 shows a schematic cross-sectional structure of a display module. As shown in FIG1 , the display module may include a display panel 100, an encapsulation layer 200, a patterned black photoresist layer, and a patterned color photoresist layer stacked in sequence, wherein:

[0058] The display panel 100 includes a plurality of pixel units 101 (including a red pixel unit 101a, a green pixel unit 101b, and a blue pixel unit 101c in the cross-sectional structural diagram shown in FIG1 ) and a patterned cathode layer 102. The patterned cathode layer 102 may include a plurality of pixel regions (not shown in FIG1 ) and a connection region (not shown in FIG1 ). The specific structure of the patterned cathode layer 102 will be described in detail below.

[0059] The orthographic projection of the black photoresist covering area 300 of the patterned black photoresist layer on the display panel covers the connection area.

[0060] The orthographic projection of the color photoresist coverage area 400 of the patterned color photoresist layer (including the red photoresist coverage area 400a, the green photoresist coverage area 400b, and the blue photoresist coverage area 400c in the cross-sectional structural diagram of FIG1 ) on the display panel covers the area occupied by all pixel units 101. Specifically, as shown in FIG1 , the patterned black photoresist layer and the patterned color photoresist layer are located on the same plane in the completed display module, and there is no overlap between the patterned black photoresist layer and the patterned color photoresist layer.

[0061] As shown in FIG1 , it can be seen from the cross-sectional view that the color photoresist covered area 400 corresponds to the pixel unit 101 one-to-one, and the "width" of the color photoresist covered area 400 is greater than the "width" of the pixel unit 101. However, FIG1 does not intuitively show the relative positional relationship between the black photoresist covered area 300 and the connection area. The following will combine the above embodiments to explain the specific structure of each layer in the display module.

[0062] In the above embodiment, specifically, FIG2 shows a schematic structural diagram of a patterned cathode layer 102 on its plane, wherein:

[0063] The pixel area 102a is square, each pixel area 102a corresponds to the pixel unit 101 one-to-one, and the orthographic projection of each pixel area 102a covers the area occupied by the corresponding pixel unit 101, so as to realize the conduction of the pixel unit 101. In some other implementations of the above embodiments, the shape of the pixel area 102a may also include other shapes including circles and hexagons, and the orthographic projection of a single pixel area 102a needs to ensure that it can at least be circumscribed to the corresponding pixel unit 101. In the specific preparation process, a fine mask can be used for evaporation of the patterned cathode. In a preferred case, the shape of the pixel area 102a can also be consistent with the shape of the corresponding pixel unit 101, that is, the orthographic projection of the pixel area 102a coincides with the area occupied by the corresponding pixel unit 101.

[0064] The connection region is used to connect pixel regions 102a, ensuring at least one connection path between any two pixel regions 102a, thereby ensuring cathode conduction. Specifically, the connection region is composed of a plurality of connection strips 102b, each of which is positioned between two adjacent pixel regions 102a, and the width of each connection strip 102b is less than the shortest side length of each pixel region 102a. In the patterned cathode layer 102 shown in FIG2 , any two adjacent pixel regions 102a have a connection strip. In another specific implementation of the above embodiment, Figures 3a and 3b respectively illustrate schematic structural diagrams of another patterned cathode layer 102 in its plane. A comparison of Figures 2 and 3a shows that the number of connecting strips 102b in the patterned cathode layer 102 shown in Figure 3a is significantly reduced compared to the number of connecting strips 102b shown in Figure 2. A comparison of Figures 2 and 3b shows that the connecting strips 102b in the patterned cathode layer 102 shown in Figure 3b are only capable of ensuring that there is one and only one path between any two pixel regions 102a. The reduction in connecting strips 102b is intended to minimize the area of ​​the black photoresist coverage area 300 while ensuring that the cathode can be conductive. Those skilled in the art may freely select and implement this method based on actual application circumstances, and this is not limited herein.

[0065] In the above embodiment, the black photoresist coverage area 300 further includes a plurality of black photoresist strips 300a. The black photoresist strips 300a correspond one-to-one with the connecting strips 102b, and the width d' of the black photoresist strips is greater than or equal to the width d of the connecting strips 102b. It will be understood that FIG1 is equivalent to a schematic diagram of the cross-section formed by dashed lines A and B in FIG2 . To illustrate the correspondence between the black photoresist strips and the connecting strips, FIG4 is a schematic diagram of the cross-section formed by dashed lines C and D in FIG2 . It can be seen that since this cross-section does not contain pixel regions 102a, there are no corresponding pixel units or color photoresist coverage areas 400. As shown in FIG4 , the black photoresist strips 300a correspond one-to-one with the connecting strips 102b in the vertical direction, and the width d' of the black photoresist strips 300a is greater than or equal to the width d of the connecting strips 102b, so that the orthographic projection of the black photoresist coverage area 300 on the display panel covers the connecting region. It can be understood that the fewer the number of connecting strips 102b, the narrower the width d of a single connecting strip 102b, and the corresponding black photoresist coverage area 300 will be relatively smaller. Compared with the prior art in which the black photoresist layer fully covers the distribution intervals of the pixel units, the above-mentioned display module provided by the present disclosure reduces the coverage area of ​​the black photoresist layer, avoids the problem of light output from the wide-viewing angle panel being blocked by the black photoresist layer, and improves the attenuation of the panel's viewing angle brightness.

[0066] In the above embodiment, further, as shown in FIG2 and FIG4, the gap area 103 of the patterned cathode layer 102 is covered by an organic cathode patterning material. It is understood that when using a fine mask to evaporate the patterned cathode, a layer of organic cathode patterning material can be evaporated first, and then the cathode material can be evaporated to form the desired patterned cathode. Those skilled in the art will

[0067] As in the above embodiment, a protective layer is further provided over the patterned color photoresist layer 400. In one specific implementation, an OC (overcoat) film can be used as the protective layer. The OC film is a cured film protective layer formed by spin-coating a layer of resin material onto the color filter film surface. This OC film improves the surface smoothness and light transmittance of the color filter film, while also providing excellent heat resistance and strength to protect the color filter film from damage and extend its service life. Those skilled in the art can select the desired protective layer based on actual needs, and this is not a limitation here.

[0068] In some embodiments of the present disclosure, FIG5 provides a flow chart of a method for preparing a display module. As shown in FIG5 , the method may specifically include the following steps:

[0069] Step 501: Provide a display panel having a patterned cathode layer and a plurality of pixel units. The patterned cathode layer includes a plurality of pixel regions and a connection region. The pixel regions correspond one to one with the pixel units. The connection region is used to connect the pixel regions so that at least one connection path exists between any two pixel regions. The relevant technical features have been specifically explained and illustrated in the aforementioned display module embodiments and will not be repeated here.

[0070] Step 502: Prepare an encapsulation layer on the patterned cathode layer.

[0071] Step 503: Prepare a patterned black photoresist layer on the encapsulation layer so that the orthographic projection of the black photoresist covered area on the display panel covers the connection area.

[0072] Step 504: Prepare a patterned color photoresist layer on the patterned black photoresist layer, so that the orthographic projection of the color photoresist coverage area on the display panel covers the area occupied by all pixel units.

[0073] In the above embodiment, as shown in FIG5 , the process may further include step 505: forming a protective layer on the patterned color photoresist layer. Based on the descriptions in the above embodiments, coating the patterned color photoresist layer and the patterned black photoresist layer with a protective layer can improve the flatness, light transmittance, and service life of the color film, which will not be further elaborated here.

[0074] In the above embodiment, further, FIG6 shows a schematic diagram of a process for providing a display panel with a patterned cathode layer and a plurality of pixel units. As shown in FIG6 , the specific implementation process of the above step 501 may include:

[0075] Step 501a: Using a fine mask, an organic cathode patterning material is evaporated onto the cover layer of the display panel. Specifically, the shape of the fine mask can be consistent with the shape of the cathode-covering area of ​​the patterned cathode layer. Specifically, the shape of the fine mask can be as shown in FIG. 2 , FIG. 3a , or FIG. 3b in the aforementioned embodiments. During the evaporation process in step 501a, the organic cathode patterning material is formed within the openings of the fine mask.

[0076] Step 501b: Vapor-depositing a cathode material onto the organic cathode patterned material to form a patterned cathode layer. It is understood that since the cathode material cannot form a film on the organic cathode patterned material during the vapor deposition process, using a fine mask consistent with the shape of the patterned cathode layer and performing the above-described step 501a allows the cathode material in step 501b to directly form the desired patterned shape after vapor deposition.

[0077] In the above embodiment, further, in the specific implementation process of the above step 504, it can include: sequentially preparing a patterned red photoresist layer, a patterned green photoresist layer and a patterned blue photoresist layer on the patterned black photoresist layer, wherein: the orthographic projection of the patterned red photoresist layer on the display panel corresponds to the distribution position of the red pixel unit; the orthographic projection of the patterned green photoresist layer on the display panel corresponds to the distribution position of the green pixel unit; the orthographic projection of the patterned blue photoresist layer on the display panel corresponds to the distribution position of the blue pixel unit, so as to realize the function of the COE structure to improve the light transmittance effect of the display screen.

[0078] In some embodiments of the present disclosure, a display device is further provided. This display device is equipped with the display module provided by the aforementioned embodiments, which will not be described in detail here.

[0079] In summary, through the technical solution provided by the present disclosure, a patterned COE (Color Filter On Encapsulation) structure is provided. Through the design of the patterned display panel cathode, the patterned shapes of the black photoresist layer and the color photoresist layer in the COE structure are determined, so that the optimized patterned COE structure can effectively reduce the reflectivity of the display panel while reducing the coverage area of ​​the light and color photoresist layer at the edge of the pixel, thereby improving the viewing angle brightness attenuation of the panel and enhancing the user experience.

[0080] The above content is a further detailed description of the present disclosure in conjunction with specific preferred embodiments, and the specific implementation of the present disclosure should not be considered to be limited to these descriptions. For those skilled in the art of the present disclosure, without departing from the concept of the present disclosure, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present disclosure.

Claims

1. A display module, characterized in that: It includes a display panel, an encapsulation layer, a patterned black photoresist layer and a patterned color photoresist layer stacked in sequence; The display panel includes a plurality of pixel units and a patterned cathode layer, wherein the patterned cathode layer includes a plurality of pixel regions and a connection region, wherein: The pixel regions correspond to the pixel units one by one, and the orthographic projection of each pixel region covers the area occupied by the corresponding pixel unit; The connection area is used to connect the pixel areas so that there is at least one connection path between any two pixel areas; The orthographic projection of the black photoresist coverage area of ​​the patterned black photoresist layer on the display panel covers the connection area; The orthographic projection of the color photoresist coverage area of ​​the patterned color photoresist layer on the display panel covers the area occupied by all the pixel units.

2. The display module according to claim 1, wherein: The gap regions of the patterned cathode layer are covered by an organic cathode patterning material.

3. The display module according to claim 1, wherein: The orthographic projection of the pixel area coincides with the area occupied by the corresponding pixel unit.

4. The display module according to claim 1, wherein: The connection area includes a plurality of connection belts; The width of the connecting strip is smaller than the shortest side length of the pixel unit; Each of the connecting strips is disposed between two adjacent pixel regions.

5. The display module according to claim 4, characterized in that: The black photoresist covering area includes a plurality of black photoresist strips, and the black photoresist strips correspond to the connecting strips one by one; The width of the black photoresist band is greater than or equal to the width of the connecting band.

6. A method for preparing a display module, characterized in that: The steps include: A display panel with a patterned cathode layer and a plurality of pixel units is provided, wherein the patterned cathode layer comprises a plurality of pixel regions and a connection region, the pixel regions correspond to the pixel units one by one, and the connection region is used to connect the pixel regions so that at least one connection path exists between any two of the pixel regions; preparing an encapsulation layer on the patterned cathode layer; Preparing a patterned black photoresist layer on the encapsulation layer so that the orthographic projection of the black photoresist coverage area on the display panel covers the connection area; A patterned color photoresist layer is prepared on the patterned black photoresist layer, so that the orthographic projection of the color photoresist coverage area on the display panel covers the area occupied by all the pixel units.

7. The method for preparing a display module according to claim 6, wherein: The process of providing a display panel with a patterned cathode layer and a plurality of pixel units includes: Using a fine mask, evaporating an organic cathode patterning material on the cover layer of the display panel; Vapor depositing a cathode material on the organic cathode patterning material to form a patterned cathode layer; The fine mask and the cathode coverage area of ​​the patterned cathode layer are consistent.

8. The method for preparing a display module according to claim 6, wherein: The process of preparing the patterned color photoresist layer on the patterned black photoresist layer includes: Sequentially preparing a patterned red photoresist layer, a patterned green photoresist layer and a patterned blue photoresist layer on the patterned black photoresist layer; The orthographic projection of the patterned red photoresist layer on the display panel corresponds to the distribution position of the red pixel unit; The orthographic projection of the patterned green photoresist layer on the display panel corresponds to the distribution position of the green pixel unit; The orthographic projection of the patterned blue photoresist layer on the display panel corresponds to the distribution position of the blue pixel units.

9. The method for preparing a display module according to claim 6, wherein: The preparation method further comprises: A protective layer is prepared on the patterned color photoresist layer.

10. A display device, characterized in that: The invention comprises a display module as claimed in any one of claims 1 to 5.

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