Display panel, display device, and method for manufacturing a display panel

Abstract

The present invention discloses a display panel, a display device, and a method for manufacturing a display panel. The display panel includes an intermediate display area and an edge display area; it further includes: a substrate, a light-emitting layer, a packaging layer, and a light-shielding layer. The light-shielding layer includes a black matrix opening, and the black matrix opening includes a first black matrix opening and a second black matrix opening. The first black matrix opening is located in the intermediate display area, and the second black matrix opening is located in the edge display area. In a direction perpendicular to the plane of the substrate, the first black matrix opening includes opposite first and second surfaces, and the second black matrix opening includes opposite third and fourth surfaces. The third surface is on the side closer to the substrate than the fourth surface; in a direction perpendicular to the plane of the substrate, the orthographic projection area of the first surface is smaller than the orthographic projection area of the second surface, and the orthographic projection area of the third surface is larger than the orthographic projection area of the fourth surface. This application can improve the phenomenon of uneven display between the intermediate display area and the edge display area.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and more particularly, to a display panel, a display device, and a method for manufacturing a display panel. Background Art

[0002] At present, the organic light-emitting diode (OLED) display technology has become increasingly mature and has been widely used in display fields such as mobile phones and televisions. The OLED display panel usually reduces the ambient light reflectance by laminating a polarizer to achieve the integrated black effect in the standby state.

[0003] In order to pursue better folding performance, higher color gamut, and reduced power consumption of the display screen, a structure of directly forming a color filter and a black matrix on a thin film encapsulation layer - the COE (Color film on Encapsulation) structure has emerged, that is, the color film is directly made on the encapsulation layer. By using the light filtering principle of the color film, the effect of blocking external light reflection is achieved, so that the display screen has the characteristics of low power consumption and being thinner and lighter. Therefore, the COE technology has great application prospects in OLED panels, especially flexible OLED panels.

[0004] Due to the step difference caused by the printing flow of the encapsulation layer, the edge encapsulation area is uneven. When coating the color filter (CF) material, there is a difference in the CF thickness between the middle display area and the edge display area, resulting in uneven display between the middle display area and the edge display area.

[0005] Therefore, there is an urgent need to provide a display panel that can improve the uneven display between the middle display area and the edge display area. Summary of the Invention

[0006] In view of this, the present invention provides a display panel, a display device, and a method for manufacturing a display panel, which can improve the uneven display between the middle display area and the edge display area.

[0007] A display panel includes a middle display area and an edge display area surrounding the middle display area;

[0008] The display panel further includes: a substrate; a light-emitting layer located on one side of the substrate, the light-emitting layer including light-emitting units; a packaging layer located on the side of the light-emitting layer away from the substrate; and a light-shielding layer located on the side of the packaging layer away from the light-emitting layer, the light-shielding layer including a black matrix opening, the black matrix opening including a first black matrix opening and a second black matrix opening, the first black matrix opening being located in the middle display area, the second black matrix opening being located in the edge display area, in a direction perpendicular to the plane of the substrate, the first black matrix opening includes opposite first and second surfaces, the first surface being on the side of the second surface closer to the substrate, the second black matrix opening includes opposite third and fourth surfaces, the third surface being on the side of the fourth surface closer to the substrate; in a direction perpendicular to the plane of the substrate, the distance between the second black matrix opening and the substrate is less than the distance between the first black matrix opening and the substrate; in a direction perpendicular to the plane of the substrate, the projected area of the first surface is less than the projected area of the second surface, and the projected area of the third surface is greater than the projected area of the fourth surface.

[0009] The present invention also provides a display device including the above display panel.

[0010] The present invention also provides a method for manufacturing a display panel, including a middle display area and an edge display area surrounding the middle display area; providing a substrate; forming a light-emitting layer on the substrate, the light-emitting layer including light-emitting units; forming a packaging layer on the light-emitting layer, wherein when forming the packaging layer, in a direction perpendicular to the plane of the substrate, the thickness of the packaging layer corresponding to the middle display area is greater than the thickness of the packaging layer corresponding to the edge display area; forming a light-shielding layer on the packaging layer, exposing the light-shielding layer to form a black matrix and a black matrix opening, wherein a first black matrix opening is formed corresponding to the middle display area, a second black matrix opening is formed corresponding to the edge display area, and the exposure amount of the black matrix corresponding to the formation of the first black matrix opening is greater than the exposure amount of the black matrix corresponding to the formation of the second black matrix opening, so that in a direction perpendicular to the plane of the substrate, opposite first and second surfaces are formed on the first black matrix opening, the first surface being on the side of the light-shielding layer closer to the substrate, the projected area of the first surface is less than the projected area of the second surface, and opposite third and fourth surfaces are formed on the second black matrix opening, the third surface being on the side of the light-shielding layer closer to the substrate, and the projected area of the third surface is greater than the projected area of the fourth surface.

[0011] Compared with the prior art, the display panel, display device, and method for manufacturing a display panel provided by the present invention achieve at least the following beneficial effects:

[0012] In the display panel provided by the present invention, the black matrix opening includes a first black matrix opening and a second black matrix opening. The first black matrix opening is located in the middle display area, and the second black matrix opening is located in the edge display area. In a direction perpendicular to the plane of the substrate, the first black matrix opening includes opposite first and second surfaces, with the first surface on the side closer to the substrate than the second surface. The second black matrix opening includes opposite third and fourth surfaces, with the third surface on the side closer to the substrate than the fourth surface; in a direction perpendicular to the plane of the substrate, the orthographic projection area of the first surface is smaller than that of the second surface, and the orthographic projection area of the third surface is larger than that of the fourth surface. The second black matrix opening is designed to have a narrower upper part and a wider lower part. By setting a reserved coating space in the non-display area, when CF coating with a relatively thick film thickness is performed, the photoresist with increased fluidity flows into the reserved coating space in the non-display area, reducing the CF film thickness in the opening area of the edge display area, making the CF film thickness in the opening area of the edge display area basically the same as that in the opening area of the middle display area, thereby improving the uneven display phenomenon between the middle display area and the edge display area in the COE, enhancing the display uniformity of the display panel, and further being beneficial to improving the display effect of the display device.

[0013] Of course, when implementing any product of the present invention, it is not necessarily required to simultaneously achieve all the above-mentioned technical effects.

[0014] Other features and advantages of the present invention will become clear from the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings incorporated in and constituting a part of this specification illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0016] Figure 1 Shown is a schematic cross-sectional view of a display panel provided by the prior art;

[0017] Figure 2 Shown is a schematic plan view of a display panel provided by an embodiment of the present application;

[0018] Figure 3 is Figure 2 a cross-sectional view taken along A - A' in

[0019] Figure 4 is Figure 3 an enlarged view of A in

[0020] Figure 5 isFigure 2 Another cross-sectional view along A-A'

[0021] Figure 6 The figure shows a schematic cross-sectional view of adjacent first color sub-color filters and second color sub-color filters provided by the prior art;

[0022] Figure 7 The figure shows a schematic cross-sectional view of adjacent first color sub-color filters and second color sub-color filters provided by an embodiment of the present application;

[0023] Figure 8 The figure shows another schematic cross-sectional view of adjacent first color sub-color filters and second color sub-color filters provided by an embodiment of the present application;

[0024] Figure 9 is Figure 2 Another cross-sectional view along A-A'

[0025] Figure 10 The figure shows a schematic cross-sectional view of a second included angle of a second black matrix opening provided by an embodiment of the present application;

[0026] Figure 11 The figure shows another schematic cross-sectional view of a second included angle of a second black matrix opening provided by an embodiment of the present application;

[0027] Figure 12 The figure shows another schematic cross-sectional view of a second included angle of a second black matrix opening provided by an embodiment of the present application;

[0028] Figure 13 is Figure 2 Another cross-sectional view along A-A'

[0029] Figure 14 A schematic diagram of a display device provided by an embodiment of the present application;

[0030] Figure 15 The figure shows a flowchart of a method for manufacturing a display panel provided by an embodiment of the present application;

[0031] Figure 16 The figure shows another flowchart of a method for manufacturing a display panel provided by an embodiment of the present application. Detailed Description of the Embodiments

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention or its application or use.

[0034] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0035] In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values.

[0036] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] Figure 1 Shown is a schematic cross-sectional view of a display panel provided by the prior art; in the prior art, the display panel includes an intermediate display area AA1' and an edge display area AA2'. During the manufacturing process, the encapsulation layer is fabricated first, followed by the black matrix and color filter. In the direction perpendicular to the plane of the substrate 10', the cross-section of the corresponding black matrix 42' in the intermediate display area AA1' and the edge display area AA2' is substantially a right trapezoid. When fabricating the encapsulation layer 30', due to the step difference caused by the printing flow of the encapsulation layer 30', the thickness of the encapsulation layer 30' in the edge display area AA2' is less than that in the intermediate display area AA1'. When coating the CF material, it results in a difference in the CF thickness between the intermediate display area AA1' and the edge display area AA2', that is, the CF thickness h1' in the edge display area AA2' is greater than the CF thickness h2' in the intermediate display area AA1', thereby causing uneven display between the intermediate display area AA1' and the edge display area AA2', and further reducing the display effect.

[0038] In view of this, the present invention provides a display panel and a display device, which can make the CF thickness in the edge display area substantially consistent with that in the intermediate display area, improve the uneven display phenomenon between the intermediate display area and the edge display area, thereby enhancing the uniformity of the display panel, and further being beneficial to improving the display effect of the display device.

[0039] The following is described in conjunction with the drawings and specific embodiments.

[0040] Figure 2 Shown is a schematic plan view of a display panel provided by an embodiment of the present application; Figure 3 For Figure 2 a cross-sectional view taken along A - A' in Figure 4 For Figure 3Enlarged view of part A; Please refer to Figures 2 - 4 As shown in Figures 2 - 4 , an embodiment of the present application provides a display panel 100, including an intermediate display area AA1 and a peripheral display area AA2 surrounding the intermediate display area AA1;

[0041] The display panel 100 further includes:

[0042] A substrate 10;

[0043] A light-emitting layer 20, located on one side of the substrate 10, and the light-emitting layer 20 includes light-emitting units 201;

[0044] An encapsulation layer 30, located on the side of the light-emitting layer 20 away from the substrate 10; and,

[0045] A light-shielding layer 40, located on the side of the encapsulation layer 30 away from the light-emitting layer 20, the light-shielding layer 40 includes a black matrix opening 41, the black matrix opening 41 includes a first black matrix opening 401 and a second black matrix opening 402, the first black matrix opening 401 is located in the intermediate display area AA1, the second black matrix opening 402 is located in the peripheral display area AA2, in a direction perpendicular to the plane where the substrate 10 is located, the first black matrix opening 401 includes opposite first and second surfaces 4011 and 4012, the first surface 4011 is located on the side closer to the substrate 10 than the second surface 4012, the second black matrix opening 402 includes opposite third and fourth surfaces 4021 and 4022, the third surface 4021 is located on the side closer to the substrate 10 than the fourth surface 4022;

[0046] In a direction perpendicular to the plane where the substrate 10 is located, the distance h1 between the second black matrix opening 402 and the substrate 10 is less than the distance h2 between the first black matrix opening 401 and the substrate 10;

[0047] In a direction perpendicular to the plane where the substrate 10 is located, the orthographic projection area of the first surface 4011 is less than the orthographic projection area of the second surface 4012, and the orthographic projection area of the third surface 4021 is greater than the orthographic projection area of the fourth surface 4022.

[0048] Specifically, continue to refer to Figures 2 - 4 , the display panel 100 includes an intermediate display area AA1 and a peripheral display area AA2 surrounding the intermediate display area AA1;

[0049] The display panel 100 further includes:

[0050] A substrate substrate 10, the substrate substrate 10, and a driving circuit 11 located on the substrate substrate 10. Among them, the substrate substrate 10 can be formed of any suitable flexible or rigid insulating material. For example, it can be formed of polymer materials such as polyimide (PI), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyaryl compound (PAR), or glass fiber reinforced plastic (FRP), or formed of glass materials such as glass or tempered glass.

[0051] A light-emitting layer 20 is located on one side of the substrate substrate 10. The light-emitting layer 20 includes light-emitting units 201. The light-emitting layer 20 may further include a pixel definition layer 202, an anode 203, and a cathode 204. The pixel definition layer 202 is located above the driving circuit 11 and covers the edge of the anode 203. The light-emitting units 201 are located between the anode 203 and the cathode 204. Under the drive of an external voltage, electrons and holes injected by the electrodes recombine in the light-emitting units 201 to emit light.

[0052] A packaging layer 30 is located on the side of the light-emitting layer 20 away from the substrate substrate 10 , , and the packaging layer 30 is a laminated structure of an inorganic packaging layer, an organic packaging layer, and an inorganic packaging layer. The packaging layer is used to prevent water and oxygen from entering the display area and damaging the light-emitting device; and,

[0053] The light-shielding layer 40 is located on the side of the encapsulation layer 30 away from the light-emitting layer 20. The light-shielding layer 40 includes a black matrix 42 and black matrix openings 41 between adjacent black matrices 42. A color filter 50 is filled in the black matrix openings 41. The black matrix 42 can prevent light leakage, color mixing, and increase contrast. The black matrix openings 41 include a first black matrix opening 401 and a second black matrix opening 402. The first black matrix opening 401 is located in the middle display area AA1, and the second black matrix opening 402 is located in the edge display area AA2. In the direction perpendicular to the plane of the substrate 10, the first black matrix opening 401 includes opposite first and second surfaces 4011 and 4012. The first surface 4011 is on the side of the second surface 4012 closer to the substrate 10. That is, in the direction perpendicular to the plane of the substrate 10, the side closer to the light-emitting surface E of the display panel is the second surface 4012, and the side away from the light-emitting surface E of the display panel is the first surface 4011. The width of the first surface 4011 can be 27 μm, and the width of the second surface 4012 can be 30 μm. The second black matrix opening 402 includes opposite third and fourth surfaces 4021 and 4022. The third surface 4021 is on the side of the fourth surface 4022 closer to the substrate 10. That is, in the direction perpendicular to the plane of the substrate 10, the side closer to the light-emitting surface E of the display panel is the fourth surface 4022, and the side away from the light-emitting surface E of the display panel is the third surface 4021. The width of the third surface 4021 can be 35.2 μm, and the width of the fourth surface 4022 can be 30 μm. It should be noted that Figures 2 - 4 the color filter is not shown in the figure. For the convenience of guidance, Figure 3 the second surface 4012 and the fourth surface 4022 in the figure are marked with dashed lines, and Figure 4 the fourth surface 4022 in the figure is marked with a dashed line;

[0054] In the direction perpendicular to the plane of the substrate 10, the distance between the first surface 4011 of the first black matrix opening 401 and the substrate 10 is d1, and the distance between the third surface 4021 of the second black matrix opening 402 and the substrate 10 is d2. When manufacturing the encapsulation layer 30, due to the step difference caused by the printing flow of the encapsulation layer 30, d2 < d1;

[0055] In the direction perpendicular to the plane of the substrate 10, the orthographic projection area of the first surface 4011 is smaller than that of the second surface 4012, and the orthographic projection area of the third surface 4021 is larger than that of the fourth surface 4022. It can be understood that the lower opening of the first black matrix opening 401 is small and the upper opening is large, that is, the first black matrix opening 401 has a structure that is wider at the top and narrower at the bottom, presenting an inverted trapezoidal configuration; the lower opening of the second black matrix opening 402 is large and the upper opening is small, that is, the second black matrix opening 402 has a structure that is narrower at the top and wider at the bottom, presenting a regular trapezoidal configuration. The second black matrix opening 402 is designed to have a structure that is narrower at the top and wider at the bottom. By setting a reserved coating space in the non-display area, the reserved coating space can be Figure 4 the striped pattern area in Figure 4 . When CF with a relatively thick film thickness is coated, the photoresist with increased fluidity flows into the reserved coating space in the non-display area, so that the CF film thickness in the opening area of the edge display area is basically the same as that in the opening area of the middle display area, thereby improving the uneven display phenomenon between the middle display area and the edge display area in the COE, enhancing the display uniformity of the display panel, and further being beneficial to improving the display effect of the display device.

[0056] As can be seen from the above embodiments, the display panel 100 provided by the present invention at least achieves the following beneficial effects:

[0057] In the display panel of this embodiment, in the direction perpendicular to the plane of the substrate 10, the orthographic projection area of the first surface 4011 is smaller than that of the second surface 4012, and the orthographic projection area of the third surface 4021 is larger than that of the fourth surface 4022. The second black matrix opening 402 is designed to have a structure that is narrower at the top and wider at the bottom. By setting a reserved coating space in the non-display area, when CF with a relatively thick film thickness is coated, the photoresist with increased fluidity flows into the reserved coating space in the non-display area, reducing the CF film thickness in the opening area of the edge display area, so that the CF film thickness in the opening area of the edge display area is basically the same as that in the opening area of the middle display area, thereby improving the uneven display phenomenon between the middle display area and the edge display area in the COE, enhancing the display uniformity of the display panel, and further being beneficial to improving the display effect of the display device. At the same time, compared with the prior art in which the design size of the black matrix opening needs to be specifically changed to increase the accommodation space for CF coating, on the one hand, the present invention has high controllability because there is no need to add new process flows, and on the other hand, there is no need to change the CF coating amount in the prior art, so as to more effectively improve the display uniformity of the display panel.

[0058] In some optional embodiments, Figure 5 For Figure 2 another cross-sectional view of A-A' in Figure 2 , please refer to Figure 5, the display panel further includes color filters 50. The color filters 50 include a first color filter 51 and a second color filter 52 of the same color. The first color filter 51 is located in the middle display area AA1 and within the first black matrix opening 401, and the second color filter 52 is located in the edge display area AA2 and within the second black matrix opening 402. The volume of the first black matrix opening 401 corresponding to the first color filter 51 is smaller than the volume of the second black matrix opening 402 corresponding to the second color filter 52.

[0059] Specifically, the first color filter 51 and the second color filter 52 may include red color filters. The volume of the first black matrix opening 401 corresponding to the red color filter is smaller than the volume of the second black matrix opening 402 corresponding to the red color filter. By reserving space for subsequent coating of the red color filter in the non-display area of the second black matrix opening 402, when the red color filter with a relatively thick film thickness in the edge display area is coated, the red photoresist with increased fluidity flows towards the non-display area, reducing the film thickness of the red color filter in the edge display area, and making the film thickness of the red color filter in the opening area of the edge display area substantially the same as the film thickness of the red color filter in the opening area of the middle display area. For example, the film thickness of the red color filter in the opening area of the middle display area may be 3 μm, and the film thickness of the red color filter in the opening area of the edge display area may be 3.01 μm.

[0060] The first color filter 51 and the second color filter 52 may also include green color filters. The volume of the first black matrix opening 401 corresponding to the green color filter is smaller than the volume of the second black matrix opening 402 corresponding to the green color filter. By reserving space for subsequent coating of the green color filter in the non-display area of the second black matrix opening 402, when the green color filter with a relatively thick film thickness in the edge display area is coated, the green photoresist with increased fluidity flows towards the non-display area, making the film thickness of the green color filter in the opening area of the edge display area substantially the same as the film thickness of the green color filter in the opening area of the middle display area. For example, the film thickness of the green color filter in the opening area of the middle display area may be 3 μm, and the film thickness of the green color filter in the opening area of the edge display area may be 3.01 μm.

[0061] The first color filter 51 and the second color filter 52 may further include blue color filters. The volume of the first black matrix opening 401 corresponding to the blue color filter is smaller than the volume of the second black matrix opening 402 corresponding to the blue color filter. By reserving space for subsequent coating of the blue color filter in the non-display area of the second black matrix opening 402, when the blue color filter with a relatively thick film thickness in the edge display area is coated, the blue photoresist with increased fluidity flows towards the non-display area, making the film thickness of the blue color filter in the opening area of the edge display area substantially the same as the film thickness of the blue color filter in the opening area of the middle display area. For example, the film thickness of the blue color filter in the opening area of the middle display area may be 3 μm, and the film thickness of the blue color filter in the opening area of the edge display area may be 3.01 μm.

[0062] There are errors in the thicknesses of the color resistances of the above three colors. In the above three cases, the red color resistance, the green color resistance, and the blue color resistance are filled with different patterns respectively. By changing the volume of the second black matrix opening 402, the thickness of the second color resistance 52 is changed. Changing the volume of the second black matrix opening 402 is achieved by increasing the orthographic projection area of the third surface 4021, so that in the edge display area AA2, the reserved space in the non-opening area is used to share the excess CF material due to the step flow during CF coating. Thus, the CF film thickness in the opening area of the edge display area AA2 is basically the same as the CF film thickness in the opening area of the middle display area AA1, and further improves the uneven display phenomenon between the middle display area AA1 and the edge display area AA2 in the COE.

[0063] In some alternative embodiments, please continue to refer to Figure 3 , in the direction perpendicular to the plane of the substrate 10, the orthographic projection area of the second surface 4012 is equal to the orthographic projection area of the fourth surface 4022. It can be understood that the area of the fourth surface of the second black matrix opening 402 is the same as the area of the second surface of the first black matrix opening 401. When the volume of the first black matrix opening 401 corresponding to the first color resistance 51 is less than the volume of the second black matrix opening 402 corresponding to the second color resistance 52, the area of the fourth surface of the second black matrix opening 402 is made equal to the area of the second surface of the first black matrix opening 401. Only the angle between the side surface of the second black matrix opening and the third surface 4021 is changed to increase the orthographic projection area of the third surface 4021 of the second black matrix opening 402, so that the CF film thickness in the opening area of the edge display area AA2 is basically the same as the CF film thickness in the opening area of the middle display area AA1, thereby effectively improving the uneven display phenomenon between the middle display area AA1 and the edge display area AA2 in the COE.

[0064] Optionally, continue to refer to Figure 3 , the light-shielding layer 40 further includes a black matrix 42. The exposure amount of the black matrix 42 corresponding to the formation of the first black matrix opening 401 is greater than the exposure amount of the black matrix 42 corresponding to the formation of the second black matrix opening 402. Using the same process, when there is a difference in the exposure amount of the black matrix in the edge display area and the exposure amount of the black matrix in the middle display area due to the material characteristics of the negative material, for example, the exposure amount of the black matrix in the middle display area can be 100 mj, while the exposure amount of the black matrix in the edge display area is 50 mj; the exposure amount of the black matrix in the middle display area can also be 200 mj, while the exposure amount of the black matrix in the edge display area is 50 mj. When the exposure amount of the black matrix in the edge display area is insufficient, an inverted trapezoidal structure will be formed, thereby increasing the orthographic projection area of the third surface 4021 (the lower bottom surface) of the second black matrix opening 402. Furthermore, the thickness of the CF film layer in the edge display area can be reduced. At the same time, using a half-tone mask (Half Tone Mask, HTM) for exposure can achieve this effect without increasing the process.

[0065] Figure 6 The following is a schematic cross-sectional view of adjacent first color sub-color filters and second color sub-color filters provided by the prior art; please continue to refer to Figure 1 , and Figure 6 , in the prior art, in the direction perpendicular to the plane of the substrate 10', the cross-section of the corresponding black matrix 42' in the middle display area AA1' and the edge display area AA2' is basically a positive trapezoidal structure, making the black matrix opening 41' wider at the top and narrower at the bottom. The color filter 50' includes adjacent first color sub-color filters 501' and second color sub-color filters 502'. There is an overlapping area OA' between the adjacent first color sub-color filters 501' and second color sub-color filters 502'. The overlapping area OA' is located on the side of the black matrix 42' away from the substrate 10'; in the direction perpendicular to the plane of the substrate 10', the orthographic projection of the overlapping area OA' overlaps with the orthographic projection of the black matrix 42'; in the direction from the middle display area AA1' to the edge display area AA2', the first black matrix opening 401' includes adjacent third sub-openings 4013' and fourth sub-openings 4014'; there is an interface between the first color sub-color filter 501' and the second color sub-color filter 502'. The distance from the intersection point of the interface on the black matrix 42' to the third sub-opening 4013' is greater than the distance from the intersection point to the fourth sub-opening 4014'. When the CF material is coated, it causes an obvious difference in the CF thickness between the middle display area AA1' and the edge display area AA2', resulting in uneven display between the middle display area AA1' and the edge display area AA2'.

[0066] Figure 5 is Figure 2 Another cross-sectional view of A-A' in Figure 7 The following is a schematic cross-sectional view of adjacent first color sub-color filters and second color sub-color filters provided by the embodiment of the present application; please refer to Figure 7 , the light-shielding layer 40 provided in this embodiment further includes a black matrix 42; the color filter 50 includes adjacent first color sub-color filters 501 and second color sub-color filters 502. There is an overlapping area OA between the adjacent first color sub-color filters 501 and second color sub-color filters 502. The overlapping area OA is located on the side of the black matrix 42 away from the substrate 10;

[0067] In the direction from the middle display area AA1 to the edge display area AA2, the second black matrix opening 402 includes adjacent first sub-openings 4023 and second sub-openings 4024;

[0068] In the direction perpendicular to the plane of the substrate 10, the orthographic projection of the overlapping area OA overlaps with the orthographic projection of the black matrix 42;

[0069] In the direction where the middle display area AA1 points to the edge display area AA2, the distance from the intersection point of the interface on the black matrix 42 to the first sub-opening 4023 is less than or equal to the distance from the intersection point to the second sub-opening 4024. The interface is the contact surface between the first color sub-color filter 501 and the second color sub-color filter 502.

[0070] Specifically, the light-shielding layer 40 includes the black matrix 42 and the black matrix openings 41 between adjacent black matrices 42. The first color sub-color filter 501 can be a red color filter, and the second color sub-color filter 502 can be a green color filter. The first color sub-color filter 501 can also be a green color filter, and the second color sub-color filter 502 can be a blue color filter. In this embodiment, the first color sub-color filter 501 and the second color sub-color filter 502 are filled with patterns. Taking the first color sub-color filter 501 as a red color filter and the second color sub-color filter 502 as a green color filter as an example, there is an overlapping area OA between adjacent red color filters and green color filters. The overlapping area OA is located on the side of the black matrix 42 away from the substrate 10, and in the direction perpendicular to the plane where the substrate 10 is located, the orthographic projection of the overlapping area OA overlaps with the orthographic projection of the black matrix 42. In the direction where the middle display area AA1 points to the edge display area AA2, the second black matrix opening 402 includes adjacent first sub-opening 4023 and second sub-opening 4024. The red color filter is filled into the first sub-opening 4023, and the green color filter is filled into the second sub-opening 4024. There is an interface between the red color filter and the green color filter. Since the exposure amount of the first color sub-color filter 501 corresponding to the middle display area is greater than the exposure amount of the first color sub-color filter 501 corresponding to the edge display area, the intersection point of the bottom end of the interface on the black matrix 42 is closer to the first sub-opening 4023 and farther from the second sub-opening 4024. In addition to increasing the volume of the second black matrix opening 402 in this embodiment, space V can also be reserved above the black matrix 42 for the green color filter, so that the CF film thickness of the opening area in the edge display area AA2 is the same as that of the opening area in the middle display area AA1, thereby further improving the uneven display phenomenon between the middle display area AA1 and the edge display area AA2 in the COE.

[0071] It should be noted that Figure 8 The figure shows a cross-sectional schematic diagram of another adjacent first color sub-color filter and second color sub-color filter provided by the embodiment of the present application; please refer to Figure 8, in this embodiment, it is not necessary to change the volume of the second black matrix opening 402 to improve the uneven display between the middle display area AA1 and the edge display area AA2 in the COE. As long as there is still space V reserved for the adjacent second color sub-color resist 502 above the black matrix 42, the thickness of the second color sub-color resist 502 can also be reduced, so that the CF film thickness of the opening area in the edge display area AA2 is consistent with the CF film thickness of the opening area in the middle display area AA1, thereby improving the uneven display between the middle display area AA1 and the edge display area AA2 in the COE.

[0072] In some alternative embodiments, Figure 9 is Figure 2 Another cross-sectional view of A-A' in [the figure]; please refer to Figure 9 , the color resist 50 includes a first color sub-color resist 501 and a second color sub-color resist 502;

[0073] (ΔV 1 -ΔV 2 )×(λ 1 -λ 2 )<0;

[0074] Wherein, ΔV 1 is the volume difference between the second black matrix opening 402 corresponding to the first color sub-color resist 501 and the first black matrix opening 401, and ΔV 2 is the volume difference between the second black matrix opening 402 corresponding to the second color sub-color resist 502 and the first black matrix opening 401, λ 1 is the central wavelength of the first color light, and λ 2 is the central wavelength of the second color light.

[0075] Specifically, the color resist 50 includes a first color sub-color resist 501 and a second color sub-color resist 502. The first color sub-color resist 501 can be a green color resist or a blue color resist, and the second color sub-color resist 502 can be a red color resist. (ΔV 1 -ΔV 2 )×(λ 1 -λ 2 )<0, wherein, ΔV 1 is the volume difference between the second black matrix opening 402 corresponding to the first color sub-color resist 501 and the first black matrix opening 401, and ΔV 2 is the volume difference between the second black matrix opening 402 corresponding to the second color sub-color resist 502 and the first black matrix opening 401, λ 1 is the central wavelength of the first color light, and λ 2 is the central wavelength of the second color light.

[0076] In this embodiment, the first color sub-color filter 501 is taken as a green color filter, and the second color sub-color filter 502 is taken as a red color filter for example. Generally, in RGB, if the color filter CF changes by the same thickness, the fluctuation of the transmittance of the red color filter is greater than that of the green color filter. In order to balance the difference in the fluctuation of the transmittance among different colors, the thickness of the red color filter needs to be greater than that of the green color filter, that is, the thickness change of the red color filter is smaller, that is, the volume change of the second black matrix opening 402 filled with the red color filter is smaller. Since the central wavelength of red light (700 nM) is greater than that of green light (510 nM), then λ 1 -λ 2 <0. Inevitably, corresponding to (ΔV 1 -ΔV 2 )×(λ 1 -λ 2 )<0, that is: ΔV 1 >ΔV 2 , that is, ΔV 11 -ΔV 12 >ΔV 21 -ΔV 22 , where ΔV 11 is the opening volume of the second black matrix opening 402 corresponding to the green color filter, ΔV 12 is the opening volume of the first black matrix opening 401 corresponding to the green color filter, ΔV 21 is the opening volume of the second black matrix opening 402 corresponding to the red color filter, and ΔV 22 is the opening volume of the first black matrix opening 401 corresponding to the red color filter. Thus, the above scheme can balance the differences among different colors.

[0077] In some alternative embodiments, Figure 10 shows a cross-sectional view of a second included angle of the second black matrix opening provided by an embodiment of the present application; Figure 11 shows another cross-sectional view of the second included angle of the second black matrix opening provided by an embodiment of the present application; Figure 12 shows still another cross-sectional view of the second included angle of the second black matrix opening provided by an embodiment of the present application; please refer to Figure 3 , and Figures 10 - 12 , the first black matrix opening 401 further includes a first side surface 4013, the first side surface 4013 is respectively connected to the first surface 4011 and the second surface 4012, the second black matrix opening 402 further includes a second side surface 4025, and the second side surface 4025 is respectively connected to the third surface 4021 and the fourth surface 4022;

[0078] The maximum included angle between the section plane of the first side surface 4013 and the first surface 4011 is the first included angle θ 1 , 165°≥θ 1≥105°, the maximum included angle between the section plane of the second side surface 4025 and the third surface 4021 is the second included angle θ 2 , 90° ≥ θ 2 ≥ 30°.

[0079] Specifically, the maximum included angle between the section plane of the first side surface 4013 and the first surface 4011 is the first included angle θ1, 165° ≥ θ 1 ≥ 105°, and this first included angle θ 1 can be an obtuse angle, making the opening of the first black matrix 401 in the shape of an inverted trapezoid; the maximum included angle between the section plane of the second side surface 4025 and the third surface 4021 is the second included angle θ 2 , when the side surface of the black matrix 42 is a plane, the second included angle θ 2 can be 45°, as shown in Figure 10 ; when the side surface of the black matrix 42 is a curved surface, the second included angle changes gradually. The second included angle can first decrease, then increase, and finally gradually decrease again, that is, it can first decrease θ 21 , θ 22 then gradually increase, and finally θ 23 starts to gradually decrease again, as shown in Figure 11 ; the second included angle can also first increase and then decrease, that is, θ 21 first gradually increases, and then starts to gradually decrease from θ 22 , as shown in Figure 12 . In the above three cases, the opening volume of the second black matrix opening 402 can be increased, so that the CF film thickness in the opening area of the edge display area AA2 is basically the same as the CF film thickness in the opening area of the middle display area AA1, thereby improving the uneven display phenomenon between the middle display area AA1 and the edge display area AA2 in the COE.

[0080] In some alternative embodiments, Figure 13 is Figure 2 another sectional view of A - A' in Figure 4 ; please refer to Figure 13 , the first black matrix opening 401 further includes a first side surface 4013, the first side surface 4013 is respectively connected to the first surface 4011 and the second surface 4012, the second black matrix opening 402 further includes a second side surface 4025, and the second side surface 4025 is respectively connected to the third surface 4021 and the fourth surface 4022;

[0081] In the direction from the middle display area AA1 to the edge display area AA2, the included angle between the first side surface 4013 and the first surface 4011 is the third included angle θ 3 , and the third included angle θ 3 gradually decreases, such as θ 31 > θ 32 > θ 33, the included angle between the second side surface 4025 and the third surface 4021 is the fourth included angle θ 4 , the fourth included angle θ 4 gradually decreases, such as θ 41 > θ 42 > θ 43 , due to the radian of the ramp area of the edge encapsulation area, the thickness difference caused by the color resist fluidity will also be different. The fourth included angle θ of the second black matrix opening 4 can be set to be gradient. That is to say, in the direction from the middle display area AA1 to the edge display area AA2, the third included angle θ 3 and the fourth included angle θ 4 are both gradient, so that the volume of the first black matrix opening 401 and the volume of the second black matrix opening 402 gradually increase, making the CF film thickness of the opening area in the edge display area AA2 approximately equal to the CF film thickness of the opening area in the middle display area AA1, thereby being able to improve the uneven display phenomenon between the middle display area AA1 and the edge display area AA2 in the COE.

[0082] Based on the same inventive principle, the present invention also provides a display device, Figure 14 which is a schematic diagram of the display device provided by the embodiment of the present invention, as Figure 14 shown, the display device includes any one of the display panels 100 provided by the present invention. The display device provided by the embodiment of the present invention can be any electronic product with a display function, including but not limited to the following categories: television, notebook computer, desktop monitor, tablet computer, digital camera, mobile phone, smart bracelet, smart glasses, vehicle-mounted display, medical device, industrial control device, touch interaction terminal, etc.

[0083] Based on the same inventive principle, the embodiment of the present invention also provides a method for manufacturing a display panel, which can be applicable to manufacturing any one of the display panels provided by the present invention. Figure 15 Shown is a flowchart of a method for manufacturing a display panel provided by an embodiment of the present application; please refer to Figure 15 shown, the present invention provides a method for manufacturing a display panel, including:

[0084] including a middle display area AA1 and an edge display area AA2 surrounding the middle display area;

[0085] S1: Provide a substrate 10;

[0086] S2: Form a light-emitting layer on the substrate 10, and the light-emitting layer includes light-emitting units;

[0087] S3: Form a packaging layer on the light-emitting layer. Among them, when forming the packaging layer, in the direction perpendicular to the plane where the substrate 10 is located, the thickness of the packaging layer corresponding to the middle display area AA1 is greater than the thickness of the packaging layer corresponding to the edge display area AA2;

[0088] S4: Form a light-shielding layer on the encapsulation layer, expose the light-shielding layer to form a black matrix and black matrix openings. Among them, a first black matrix opening 401 is formed corresponding to the middle display area AA1, a second black matrix opening 402 is formed corresponding to the edge display area AA2, and the exposure amount of the black matrix corresponding to the formation of the first black matrix opening 401 is greater than the exposure amount of the black matrix corresponding to the formation of the second black matrix opening 402, so that in the direction perpendicular to the plane where the substrate 10 is located, opposite first surface 4011 and second surface 4012 are formed on the first black matrix opening 401. The first surface 4011 is located on the side of the light-shielding layer close to the substrate 10, and the orthographic projection area of the first surface 4011 is smaller than the orthographic projection area of the second surface 4012. Opposite third surface 4021 and fourth surface 4022 are formed on the second black matrix opening 402. The third surface 4021 is located on the side of the light-shielding layer close to the substrate 10, and the orthographic projection area of the third surface 4021 is larger than the orthographic projection area of the fourth surface 4022.

[0089] That is to say, in the above embodiment, the light-emitting layer is first formed, then the encapsulation layer is formed on the light-emitting layer, and finally the light-shielding layer is formed on the encapsulation layer. The light-shielding layer is exposed to form a black matrix and black matrix openings. Among them, a first black matrix opening 401 is formed corresponding to the middle display area AA1, a second black matrix opening 402 is formed corresponding to the edge display area AA2, and the exposure amount of the black matrix corresponding to the formation of the first black matrix opening 401 is greater than the exposure amount of the black matrix corresponding to the formation of the second black matrix opening 402. For example, the exposure amount of the black matrix corresponding to the formation of the first black matrix opening 401 can be 100 mj, while the exposure amount of the black matrix corresponding to the formation of the second black matrix opening 402 is 50 mj; the exposure amount of the black matrix corresponding to the formation of the first black matrix opening 401 can also be 150 mj, while the exposure amount of the black matrix corresponding to the formation of the second black matrix opening 402 is 50 mj; of course, the exposure amount of the black matrix corresponding to the formation of the first black matrix opening 401 can also be 200 mj, then the exposure amount of the black matrix corresponding to the formation of the second black matrix opening 402 is 50 mj. Since the black matrix is a negative photoresist, when the exposure amount of the black matrix in the edge display area is insufficient, an undercut structure will be formed, so that the second black matrix opening 402 is a structure with a narrow upper part and a wide lower part, presenting a positive trapezoidal configuration.

[0090] In this embodiment, by designing the second black matrix opening 402 into a structure that is narrow at the top and wide at the bottom, on the one hand, a reserved coating space can be set in the non-display area, so that when the color resist with a relatively thick film thickness is coated, the photoresist with increased fluidity flows into the reserved coating space in the non-display area, making the CF film thickness in the opening area of the edge display area basically the same as that in the opening area of the middle display area. Thus, the phenomenon of uneven display between the middle display area and the edge display area in the COE is improved, the display uniformity of the display panel is enhanced, and further, the display effect of the display device is improved. On the other hand, using a half-tone mask (HTM) for exposure can achieve this effect without adding processes.

[0091] Optionally, the exposure amount of the black matrix corresponding to the formation of the first black matrix opening 401 is 1.5 - 4:1 compared to the exposure amount of the black matrix corresponding to the formation of the second black matrix opening 402.

[0092] In some alternative embodiments, Figure 16 The following shows another flowchart of the method for manufacturing a display panel provided by the embodiment of the present application. Please refer to Figure 16 In this embodiment, a first color filter layer is formed by coating a first color photoresist between the first black matrix opening 401 and the second black matrix opening 402, and the first color filter layer is exposed. The first color sub-color resist 501 of the first color resist 51 is formed corresponding to the middle display area AA1, and the first color sub-color resist 501 of the second color resist 52 is formed corresponding to the edge display area AA2.

[0093] In the direction from the middle display area AA1 to the edge display area AA2, adjacent first sub-openings 4023 and second sub-openings 4024 are formed corresponding to the second black matrix opening 402.

[0094] The exposure amount of the first color sub-color resist 501 of the first color resist 51 is greater than the exposure amount of the first color sub-color resist 501 of the second color resist 52, so that there is an overlapping area between the first color sub-color resist 501 in the first color resist 51 and the second color resist 52 and a preset second color sub-color resist 502. The overlapping area is located on the side of the black matrix away from the substrate 10, and the orthographic projection of the overlapping area overlaps with the orthographic projection of the black matrix. In the direction from the middle display area AA1 to the edge display area AA2, the distance from the intersection point of the interface on the black matrix to the first sub-opening 4023 is less than the distance from the intersection point to the second sub-opening 4024. The interface is the contact surface between the first color sub-color resist 501 and the preset second color sub-color resist 502.

[0095] That is to say, in the above embodiments, after forming the black matrix, a first color photoresist is coated between the first black matrix opening 401 and the second black matrix opening 402 to form a first color filter layer, and the first color filter layer is exposed. Since the exposure amount for forming the first color sub-color resist 501 corresponding to the middle display area is greater than the exposure amount for forming the first color sub-color resist 501 corresponding to the edge display area. For example, the exposure amount for forming the first color sub-color resist 501 corresponding to the middle display area can be 200 mj, and the exposure amount for forming the first color sub-color resist 501 corresponding to the edge display area can be 50 - 100 mj. As a result, there is an overlapping area between the first color sub-color resist 501 in the first color resist 51 and the second color resist 52 and a preset second color sub-color resist 502. The orthographic projection of the overlapping area overlaps with the orthographic projection of the black matrix. In the direction from the middle display area AA1 to the edge display area AA2, the distance from the intersection point of the interface on the black matrix to the first sub-opening 4023 is less than the distance from the intersection point to the second sub-opening 4024.

[0096] In this embodiment, when increasing the volume of the second black matrix opening 402, when the exposure amount of the first color sub-color resist 501 corresponding to the edge display area is insufficient, a slope will be formed. The slope can be understood as the interface between adjacent first color sub-color resists and second color sub-color resists. The intersection point of the slope and the black matrix is close to the first sub-opening and far from the second sub-opening, thereby reserving space for subsequent coating of the film layer, and further improving the phenomenon of uneven display between the middle display area AA1 and the edge display area AA2 in the COE.

[0097] Optionally, the ratio of the exposure amount of the first color sub-color resist 501 in the first color resist 51 to the exposure amount of the first color sub-color resist 501 in the second color resist 52 is 2 - 4:1.

[0098] As can be seen from the above embodiments, the display panel, display device, and method for manufacturing a display panel provided by the present invention at least achieve the following beneficial effects:

[0099] In the display panel provided by the present invention, the black matrix opening includes a first black matrix opening and a second black matrix opening. The first black matrix opening is located in the middle display area, and the second black matrix opening is located in the edge display area. In the direction perpendicular to the plane of the substrate, the first black matrix opening includes opposite first and second surfaces, the first surface is on the side of the second surface close to the substrate, the second black matrix opening includes opposite third and fourth surfaces, and the third surface is on the side of the fourth surface close to the substrate; in the direction perpendicular to the plane of the substrate, the orthographic projection area of the first surface is smaller than that of the second surface, and the orthographic projection area of the third surface is larger than that of the fourth surface. The second black matrix opening 402 is designed to have a narrow upper part and a wide lower part. By setting a reserved coating space in the non-display area, when the color resist with a relatively thick film thickness is coated, the photoresist with increased fluidity flows into the reserved coating space in the non-display area, reducing the CF film thickness in the opening area of the edge display area, making the CF film thickness in the opening area of the edge display area consistent with that in the opening area of the middle display area, thereby improving the uneven display phenomenon between the middle display area and the edge display area in the COE, enhancing the display uniformity of the display panel, and further being beneficial to improving the display effect of the display device.

[0100] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A display panel, characterized in that, it includes an intermediate display area and an edge display area surrounding the intermediate display area; the display panel further includes: a substrate; a light-emitting layer located on one side of the substrate, and the light-emitting layer includes light-emitting units; a packaging layer located on the side of the light-emitting layer away from the substrate; and, a light-shielding layer located on the side of the packaging layer away from the light-emitting layer, the light-shielding layer includes a black matrix opening, the black matrix opening includes a first black matrix opening and a second black matrix opening, the first black matrix opening is located in the intermediate display area, the second black matrix opening is located in the edge display area, in a direction perpendicular to the plane where the substrate is located, the first black matrix opening includes opposite first and second surfaces, the first surface is located on the side of the second surface closer to the substrate, the second black matrix opening includes opposite third and fourth surfaces, the third surface is located on the side of the fourth surface closer to the substrate; in a direction perpendicular to the plane where the substrate is located, the distance between the second black matrix opening and the substrate is less than the distance between the first black matrix opening and the substrate; in a direction perpendicular to the plane where the substrate is located, the projected area of the first surface is less than the projected area of the second surface, and the projected area of the third surface is greater than the projected area of the fourth surface.

2. The display panel according to claim 1, characterized in that, the display panel further includes color filters, the color filters include a first color filter and a second color filter of the same color, the first color filter is located in the intermediate display area and in the first black matrix opening, the second color filter is located in the edge display area and in the second black matrix opening, and the volume of the first black matrix opening corresponding to the first color filter is less than the volume of the second black matrix opening corresponding to the second color filter.

3. The display panel according to claim 2, characterized in that, in a direction perpendicular to the plane where the substrate is located, the projected area of the second surface is equal to the projected area of the fourth surface.

4. The display panel according to claim 2, characterized in that, the light-shielding layer further includes a black matrix, and the exposure amount of the black matrix forming the first black matrix opening is greater than the exposure amount of the black matrix forming the second black matrix opening.

5. The display panel according to claim 2, characterized in that, the light-shielding layer further includes a black matrix; the color filters include adjacent first color sub-filters and second color sub-filters, and there is an overlapping area between the adjacent first color sub-filters and second color sub-filters, and the overlapping area is located on the side of the black matrix away from the substrate; in the direction from the intermediate display area to the edge display area, the second black matrix opening includes adjacent first sub-openings and second sub-openings; in a direction perpendicular to the plane where the substrate is located, the projection of the overlapping area overlaps with the projection of the black matrix; In the direction from the middle display area towards the edge display area, the distance from the intersection point of the interface surface on the black matrix to the first sub-opening is less than or equal to the distance from the intersection point to the second sub-opening, and the interface surface is the contact surface between the first color sub-color filter and the second color sub-color filter.

6. The display panel according to claim 2, wherein, the color filter includes a first color sub-color filter and a second color sub-color filter; (ΔV 1 -ΔV 2 )×(λ 1 -λ 2 ) < 0; Among them, ΔV 1 is the volume difference between the second black matrix opening corresponding to the first color sub-color filter and the first black matrix opening, and ΔV 2 is the volume difference between the second black matrix opening corresponding to the second color sub-color filter and the first black matrix opening, and λ 1 is the central wavelength of the first color light, and λ 2 is the central wavelength of the second color light.

7. The display panel according to claim 6, wherein, the first color sub-color filter is a green color filter or a blue color filter, and the second color sub-color filter is a red color filter.

8. The display panel according to claim 1, wherein, the first black matrix opening further includes a first side surface, the first side surface is respectively connected to the first surface and the second surface, the second black matrix opening further includes a second side surface, and the second side surface is respectively connected to the third surface and the fourth surface; The maximum angle between the section plane of the first side surface and the first surface is the first angle θ 1 , 165° ≥ θ 1 ≥ 105°, and the maximum angle between the section plane of the second side surface and the third surface is the second angle θ 2 , 90° ≥ θ 2 ≥ 30°.

9. The display panel according to claim 1, wherein, the first black matrix opening further includes a first side surface, the first side surface is respectively connected to the first surface and the second surface, the second black matrix opening further includes a second side surface, and the second side surface is respectively connected to the third surface and the fourth surface; In the direction from the middle display area towards the edge display area, the angle between the first side surface and the first surface is a third angle, and the third angle gradually decreases. The angle between the second side surface and the third surface is a fourth angle, and the fourth angle gradually decreases.

10. A display device, wherein, it includes the display panel according to any one of claims 1-9.

11. A method for manufacturing a display panel, wherein, it includes a middle display area and an edge display area surrounding the middle display area; providing a substrate; forming a light-emitting layer on the substrate, and the light-emitting layer includes light-emitting units; forming a packaging layer on the light-emitting layer. When forming the packaging layer, in the direction perpendicular to the plane where the substrate is located, the thickness of the packaging layer corresponding to the middle display area is greater than the thickness of the packaging layer corresponding to the edge display area; forming a light-shielding layer on the packaging layer, exposing the light-shielding layer to form a black matrix and black matrix openings. Among them, a first black matrix opening is formed corresponding to the middle display area, and a second black matrix opening is formed corresponding to the edge display area. The exposure amount of the black matrix corresponding to the formation of the first black matrix opening is greater than the exposure amount of the black matrix corresponding to the formation of the second black matrix opening, so that in the direction perpendicular to the plane where the substrate is located, opposite first and second surfaces are formed on the first black matrix opening. The first surface is located on the side of the light-shielding layer close to the substrate, and the orthographic projection area of the first surface is smaller than the orthographic projection area of the second surface. Opposite third and fourth surfaces are formed on the second black matrix opening. The third surface is located on the side of the light-shielding layer close to the substrate, and the orthographic projection area of the third surface is greater than the orthographic projection area of the fourth surface.

12. The method for manufacturing a display panel according to claim 11, It is characterized in that the black matrix is a negative photoresist.

13. The method for manufacturing a display panel according to claim 11, it is characterized in that the exposure amount ratio of the black matrix corresponding to the first black matrix opening to the black matrix corresponding to the second black matrix opening is 1.5 to 4:

1.

14. The method for manufacturing a display panel according to claim 11, it is characterized in that a first color photoresist is coated between the first black matrix opening and the second black matrix opening to form a first color filter layer, and the first color filter layer is exposed to form a first color sub-color resist of the first color resist corresponding to the middle display area and a first color sub-color resist of the second color resist corresponding to the edge display area; in the direction from the middle display area to the edge display area, a first sub-opening and a second sub-opening are formed adjacent to the second black matrix opening; the exposure amount for forming the first color sub-color resist of the first color resist is greater than the exposure amount for forming the first color sub-color resist of the second color resist, so that there is an overlapping area between the first color sub-color resist and a preset second color sub-color resist in the first color resist and the second color resist. The overlapping area is located on the side of the black matrix away from the substrate, and the orthographic projection of the overlapping area overlaps with the orthographic projection of the black matrix. In the direction from the middle display area to the edge display area, the distance from the intersection point of the interface on the black matrix to the first sub-opening is less than the distance from the intersection point to the second sub-opening. The interface is the contact surface between the first color sub-color resist and the preset second color sub-color resist.

15. The method for manufacturing a display panel according to claim 14, it is characterized in that the exposure amount ratio of the first color sub-color resist of the first color resist to the first color sub-color resist of the second color resist is 2 to 4:1.

Images