Display panel, display device and manufacturing method of display panel

Abstract

The invention provides a display panel, a display device and a manufacturing method of the display panel, the display panel comprises a substrate, a pixel defining layer and a light emitting unit, the pixel defining layer defines a first opening, a second opening and a third opening; the red light-emitting unit is arranged in the first opening, the green light-emitting unit is arranged in the second opening, and the blue light-emitting unit is arranged in the third opening; a first angle is formed between the side wall, facing the first opening, of the pixel defining layer and the substrate, a second angle is formed between the side wall, facing the second opening, of the pixel defining layer and the substrate, a third angle is formed between the side wall, facing the third opening, of the pixel defining layer and the substrate, the first angle is smaller than the second angle, and the second angle is smaller than the third angle; the thickness of the red light-emitting unit is larger than that of the green light-emitting unit, and the thickness of the green light-emitting unit is larger than that of the blue light-emitting unit. The thickness of each light-emitting unit is adjusted by adjusting the angle to form an optical microcavity, and selection and reinforcement of emergent light of the light-emitting units are achieved.

Description

Technical Field

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

[0002] An organic light-emitting diode (OLED) display, also known as an organic electroluminescent display. Compared with the existing liquid crystal displays, it has a series of advantages such as self-luminescence, wide viewing angle, ultra-light, ultra-thin, high brightness, low power consumption, and fast response, and the response speed can reach 1000 times that of liquid crystal displays. Therefore, OLED displays have become very popular flat panel display products at home and abroad and have broad application prospects. Quantum dot (QD) materials have the advantages of high emission color purity, adjustable emission wavelength, and material stability, and have significant advantages in the field of pursuing high gamut color display.

[0003] QLED (quantum-dots light emitting diodes) is a new type of light-emitting device. Quantum dot light-emitting diodes (QLEDs) have gradually become one of the mainstream development directions of display technology in the future due to their self-luminescence characteristics without the need for an additional light source, as well as advantages such as a narrow emission peak, adjustable emission color, and high emission efficiency, but there are still some problems to be solved. Summary of the Invention

[0004] Embodiments of the present application provide a display panel, a display device, and a manufacturing method of the display panel, aiming to improve the process performance of display products.

[0005] An embodiment of the first aspect of the present application provides a display panel, including: a substrate, a pixel definition layer, and a light-emitting unit. The pixel definition layer is disposed on one side of the substrate, and the pixel definition layer surrounds to form a plurality of pixel openings. The pixel openings include a first opening, a second opening, and a third opening. The light-emitting unit includes a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit. The red light-emitting unit is disposed in the first opening, the green light-emitting unit is disposed in the second opening, and the blue light-emitting unit is disposed in the third opening. Wherein, there is a first angle between the side wall of the pixel definition layer facing the first opening and the substrate, there is a second angle between the side wall of the pixel definition layer facing the second opening and the substrate, and there is a third angle between the side wall of the pixel definition layer facing the third opening and the substrate. The first angle is less than the second angle, and the second angle is less than the third angle. Along the direction perpendicular to the substrate, the thickness of the red light-emitting unit is greater than the thickness of the green light-emitting unit, and the thickness of the green light-emitting unit is greater than the thickness of the blue light-emitting unit.

[0006] In some embodiments of the present application, the area of the substrate exposed to the first opening, the area of the substrate exposed to the second opening, and the area of the substrate exposed to the third opening are all equal or at least unequal.

[0007] In some embodiments of the present application, a first electrode layer is arranged between the substrate and the pixel defining layer, and the area of the first electrode layer exposed to the first opening, the area of the first electrode layer exposed to the second opening, and the area of the first electrode layer exposed to the third opening are equal or at least the two are different.

[0008] In some embodiments of the present application, along a direction perpendicular to the substrate, heights of the pixel defining layers between the pixel openings are equal.

[0009] In some embodiments of the present application, a second electrode layer is provided on a side of the light-emitting unit facing away from the substrate.

[0010] In some embodiments of the present application, the first opening volume V1 is calculated by the following formula:

[0011] V1=L1*h1*d1+h1 2 (L1+2d1)*cotθ1+2*h1 3 *(cotθ1) 2

[0012] Wherein, L1 is the width of the substrate exposed in the first opening, d1 is the length of the substrate exposed in the first opening, h1 is the height of the first opening in a direction perpendicular to the substrate, θ1 is a first angle, and the directions in which the width and length of the substrate exposed in the first opening are perpendicular to each other.

[0013] The second opening volume V2 is calculated by the following formula:

[0014] V2=L2*h2*d2+h2 2 (L2+2d2)*cotθ2+2*h2 3 *(cotθ2) 2

[0015] Wherein, L2 is the width of the substrate exposed in the second opening, d2 is the length of the substrate exposed in the second opening, h2 is the height of the second opening in a direction perpendicular to the substrate, θ2 is the second angle, and the directions in which the width and length of the substrate exposed in the second opening are perpendicular to each other.

[0016] The third opening volume V3 is calculated by the following formula:

[0017] V3=L3*h3*d3+h3 2 (L3+2d3)*cotθ3+2*h3 3 *(cotθ3) 2

[0018] Wherein, L3 is the width of the substrate exposed to the third opening, d3 is the length of the substrate exposed to the third opening, h3 is the height of the third opening in the direction perpendicular to the substrate, θ3 is the third angle, and the directions of the width and length of the substrate exposed to the third opening are perpendicular to each other.

[0019] In some embodiments of the present application, the ratio range of the volume of the first opening to the volume of the second opening is 1.273 - 1.283, and the ratio range of the volume of the first opening to the volume of the third opening is 1.528 - 1.538.

[0020] In some embodiments of the present application, the thickness of the red light-emitting unit in the direction perpendicular to the substrate is 227 - 233 nanometers, the thickness of the green light-emitting unit in the direction perpendicular to the substrate is 177 - 183 nanometers, and the thickness of the blue light-emitting unit in the direction perpendicular to the substrate is 147 - 153 nanometers.

[0021] In some embodiments of the present application, the ratio range of the volume of the first opening to the volume of the second opening is 1.237 - 1.247, and the ratio range of the volume of the first opening to the volume of the third opening is 1.513 - 1.523;

[0022] In some embodiments of the present application, the thickness of the red light-emitting unit in the direction perpendicular to the substrate is 407 - 413 nanometers, the thickness of the green light-emitting unit in the direction perpendicular to the substrate is 327 - 333 nanometers, and the thickness of the blue light-emitting unit in the direction perpendicular to the substrate is 267 - 273 nanometers.

[0023] In some embodiments of the present application, the ratio range of the volume of the first opening to the volume of the second opening is 1.224 - 1.234, and the ratio range of the volume of the first opening to the volume of the third opening is 1.470 - 1.480;

[0024] In some embodiments of the present application, the thickness of the red light-emitting unit in the direction perpendicular to the substrate is 587 - 593 nanometers, the thickness of the green light-emitting unit in the direction perpendicular to the substrate is 477 - 483 nanometers, and the thickness of the blue light-emitting unit in the direction perpendicular to the substrate is 397 - 403 nanometers.

[0025] In some embodiments of the present application, the red light-emitting unit includes a first hole injection layer, a first hole transport layer, a first quantum dot light-emitting layer, and a first electron transport layer that are sequentially stacked. The green light-emitting unit includes a second hole injection layer, a second hole transport layer, a second quantum dot light-emitting layer, and a second electron transport layer that are sequentially stacked. The blue light-emitting unit includes a third hole injection layer, a third hole transport layer, a third quantum dot light-emitting layer, and a third electron transport layer that are sequentially stacked. Among them, along the direction perpendicular to the substrate, the thickness of the first hole injection layer is greater than that of the second hole injection layer, the thickness of the second hole injection layer is greater than that of the third hole injection layer, the thickness of the first hole transport layer is greater than that of the second hole transport layer, the thickness of the second hole transport layer is greater than that of the third hole transport layer, the thickness of the first electron transport layer is greater than that of the second electron transport layer, and the thickness of the second electron transport layer is greater than that of the third electron transport layer.

[0026] In some embodiments of the present application, a first electrode layer is disposed on the side of the light-emitting unit facing the substrate, and a second electrode layer is disposed on the side of the light-emitting unit facing away from the substrate. The first electrode layer includes a light-reflecting material, and the second electrode layer includes a semi-transparent material.

[0027] The second aspect of the present application provides a display device, including the display panel in any of the embodiments of the first aspect above.

[0028] The third aspect of the present application provides a manufacturing method of a display panel for manufacturing the display panel in any of the embodiments of the first aspect above, including the following steps:

[0029] Provide a substrate.

[0030] Form a pixel defining layer on one side of the substrate. The pixel defining layer and the substrate enclose a first opening, a second opening, and a third opening. There is a first angle between the side wall of the pixel defining layer facing the first opening and the substrate, a second angle between the side wall of the pixel defining layer facing the second opening and the substrate, and a third angle between the side wall of the pixel defining layer facing the third opening and the substrate. The first angle is less than the second angle, and the second angle is less than the third angle.

[0031] Fill the first opening, the second opening, and the third opening with hole injection layer materials, and dry the hole injection layer materials in the first opening to form a first hole injection layer, dry the hole injection layer materials in the second opening to form a second hole injection layer, and dry the hole injection layer materials in the third opening to form a third hole injection layer.

[0032] Fill the hole transport layer material in the first opening, the second opening, and the third opening, and dry the hole transport layer material in the first opening to form a first hole transport layer, dry the hole transport layer material in the second opening to form a second hole transport layer, and dry the hole transport layer material in the third opening to form a third hole transport layer.

[0033] Form a first quantum dot light-emitting layer in the first opening, where the first quantum dot light-emitting layer is used to emit red light, form a second quantum dot light-emitting layer in the second opening, where the second quantum dot light-emitting layer is used to emit green light, and form a third quantum dot light-emitting layer in the third opening, where the third quantum dot light-emitting layer is used to emit blue light.

[0034] Fill the electron transport layer material in the first opening, the second opening, and the third opening, and dry the electron transport layer material in the first opening to form a first electron transport layer, dry the electron transport layer material in the second opening to form a second electron transport layer, and dry the electron transport layer material in the third opening to form a third electron transport layer. In the embodiments of the present application, the first opening is formed by being surrounded by a pixel defining layer. By adjusting the first angle, the volume of the first opening can be adjusted, and further the thickness of the red light-emitting unit can be adjusted. The second opening is formed by being surrounded by a pixel defining layer. By adjusting the second angle, the volume of the second opening can be adjusted, and further the thickness of the green light-emitting unit can be adjusted. The third opening is formed by being surrounded by a pixel defining layer. By adjusting the third angle, the volume of the third opening can be adjusted, and further the thickness of the blue light-emitting unit can be adjusted. Both the bottom area of the pixel opening and the angle between the sidewall of the pixel defining layer facing the pixel opening and the substrate will affect the thickness of the light-emitting unit. Among them, the larger the angle, the more the sidewall surface is inclined towards the opening direction, and the smaller the opening volume. The smaller the angle, the more the sidewall surface is inclined away from the opening direction, and the larger the opening volume. By adjusting the first angle, the second angle, and the third angle, the volumes of the first opening, the second opening, and the third opening are adjusted, and further the volume of the light-emitting unit material accommodated when forming the light-emitting unit in the first opening, the second opening, and the third opening is adjusted. Since the volumes of the light-emitting unit materials are different, the thicknesses of the light-emitting unit materials when dried into films are different. The display panel in this embodiment can adjust the angle between the sidewall of the pixel defining layer facing the pixel opening and the substrate to adjust the thickness of the light-emitting unit in the pixel opening along the direction perpendicular to the substrate, thereby forming an optical microcavity, realizing the selection and enhancement of the light emitted by light-emitting units of different colors, improving the monochromaticity of the device light emission, and thus enhancing the process performance of the display panel. Description of the Drawings

[0035] By reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present application will become more apparent, where the same or similar reference numerals represent the same or similar features.

[0036] Figure 1 It is a schematic structural diagram of a display panel provided by an embodiment of the present application;

[0037] Figure 2 It is a schematic structural diagram of another display panel provided by an embodiment of the present application;

[0038] Figure 3 It is a schematic structural diagram of yet another display panel provided by an embodiment of the present application;

[0039] Figure 4 It is a schematic structural diagram of still another display panel provided by an embodiment of the present application;

[0040] Figure 5 It is a schematic structural diagram of another perspective of a display panel provided by an embodiment of the present application;

[0041] Figure 6 It is a schematic structural diagram of another display panel provided by an embodiment of the present application;

[0042] Figure 7 It is a flowchart of a manufacturing method of a display panel provided by an embodiment of the present application.

[0043] Explanation of reference numerals: 100, substrate; 110, substrate; 120, driving circuit layer; 130, planarization layer; 200, pixel definition layer; 220, first opening; 230, second opening; 240, third opening; 300, light-emitting unit; 310, red light-emitting unit; 320, green light-emitting unit; 330, blue light-emitting unit; 410, first electrode; 420, hole injection layer; 421, first hole injection layer; 422, second hole injection layer; 423, third hole injection layer; 430, hole transport layer; 431, first hole transport layer; 432, second hole transport layer; 433, third hole transport layer; 440, quantum dot light-emitting layer; 441, first quantum dot light-emitting layer; 442, second quantum dot light-emitting layer; 443, third quantum dot light-emitting layer; 450, electron transport layer; 451, first electron transport layer; 452, second electron transport layer; 453, third electron transport layer; 460, second electrode layer. Detailed implementation manners

[0044] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least some of the well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0045] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0046] The orientation terms appearing in the following description are all the directions shown in the figures, and do not specifically limit the structure of the embodiments of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0047] As Figure 1 shown, a display panel provided in an embodiment of the first aspect of the present application includes: a substrate 100, a light-emitting unit 300, and a pixel definition layer 200. The pixel definition layer 200 is disposed on one side of the substrate 100. The pixel definition layer 200 surrounds and forms a plurality of pixel openings, and the pixel openings include a first opening 220, a second opening 230, and a third opening 240. The light-emitting unit 300 includes a red light-emitting unit 310, a green light-emitting unit 320, and a blue light-emitting unit 330. The red light-emitting unit 310 is disposed in the first opening 220, the green light-emitting unit 320 is disposed in the second opening 230, and the blue light-emitting unit 330 is disposed in the third opening 240.

[0048] The sidewall of the pixel defining layer 200 facing the first opening 220 forms a first angle θ1 with the substrate 100, the sidewall of the pixel defining layer 200 facing the second opening 230 forms a second angle θ2 with the substrate 100, and the sidewall of the pixel defining layer 200 facing the third opening 240 forms a third angle θ3 with the substrate 100. The first angle θ1 is less than the second angle θ2, and the second angle θ2 is less than the third angle θ3. In a direction perpendicular to the substrate 100, the thickness of the red light-emitting unit 310 is greater than the thickness of the green light-emitting unit 320, and the thickness of the green light-emitting unit 320 is greater than the thickness of the blue light-emitting unit 330.

[0049] In this embodiment, the pixel defining layer 200 encloses a plurality of pixel openings, which are used to accommodate the light-emitting unit 300. The angle between the side wall of the pixel defining layer 200 facing the first opening 220 and the substrate 100 is a first angle θ1. The angle between the side wall of the pixel defining layer 200 facing the second opening 230 and the substrate 100 is a second angle θ2. The angle between the side wall of the pixel defining layer 200 facing the third opening 240 and the substrate 100 is a third angle θ3.

[0050] The first opening 220 is formed by the pixel defining layer 200. By adjusting the first angle θ1, the volume of the first opening 220 can be adjusted, thereby adjusting the thickness of the red light-emitting unit 310. The second opening 230 is formed by the pixel defining layer 200. By adjusting the second angle θ2, the volume of the second opening 230 can be adjusted, thereby adjusting the thickness of the green light-emitting unit 320. The third opening 240 is formed by the pixel defining layer 200. By adjusting the third angle θ3, the volume of the third opening 240 can be adjusted, thereby adjusting the thickness of the blue light-emitting unit 330. The larger the angle, the more the sidewall surface tilts toward the opening, and the smaller the opening volume. The smaller the angle, the more the sidewall surface tilts away from the opening, and the larger the opening volume. By adjusting the first angle θ1, the second angle θ2, and the third angle θ3, the volumes of the first opening 220, the second opening 230, and the third opening 240 are adjusted, thereby adjusting the volume of the light-emitting unit 300 material contained in the first opening 220, the second opening 230, and the third opening 240 when the light-emitting unit 300 is formed. Due to the different volumes of the light-emitting unit 300 material, the thickness of the dried film of the light-emitting unit 300 material varies. The display panel in this embodiment can adjust the angle between the sidewall of the pixel-defining layer 200 facing the pixel opening and the substrate 100 to adjust the thickness of the light-emitting unit 300 in the pixel opening along a direction perpendicular to the substrate 100, thereby forming an optical microcavity. This enables the selection and enhancement of light emitted by the light-emitting units 300 of different colors, improves the monochromaticity of the device's emission, and thus enhances the process performance of the display panel.

[0051] It is understandable that the wavelength range of red light is 622 - 760 nm, the wavelength range of green light is 492 - 577 nm, and the wavelength range of blue light is 435 - 450 nm. The film thickness required for the red light emitting unit 310 to form an optical microcavity is greater than the film thickness required for the green light emitting unit 320 to form an optical microcavity, and the film thickness required for the green light emitting unit 320 to form an optical microcavity is greater than the film thickness required for the blue light emitting unit 330 to form an optical microcavity. Therefore, the first angle θ1 is less than the second angle θ2, and the second angle θ2 is less than the third angle θ3, so that the volume of the first opening 220 is greater than the volume of the second opening 230, and the volume of the second opening 230 is greater than the volume of the third opening 240, thereby making the thickness of the red light emitting unit 310 greater than the thickness of the green light emitting unit 320, and the thickness of the green light emitting unit 320 greater than the thickness of the blue light emitting unit 330.

[0052] Optionally, the substrate 100 includes a substrate 110, a driving circuit layer 120, and a planar layer 130 that are sequentially stacked. Among them, the pixel defining layer 200 is disposed on the side of the planar layer 130 away from the substrate 110.

[0053] As Figure 2 shown, in some optional embodiments, the area of the substrate 100 exposed to the first opening 220, the area of the substrate 100 exposed to the second opening 230, and the area of the substrate 100 exposed to the third opening 240 are all equal, so that the process of fabricating the pixel defining layer 200 is easier, and in forming the optical microcavity structure, only by adjusting the first angle θ1, the second angle θ2, and the third angle θ3 can the volumes of the first opening 220, the second opening 230, and the third opening 240 be realized to form the optical microcavities of different color light emitting units 300.

[0054] The area of the substrate 100 exposed to the first opening 220 is the area of the substrate 100 exposed through one of the first openings 220, the area of the substrate 100 exposed to the second opening 230 is the area of the substrate 100 exposed through one of the second openings 230, and the area of the substrate 100 exposed to the third opening 240 is the area of the substrate 100 exposed through one of the third openings 240.

[0055] As Figure 3As shown, in some other embodiments, at least two of the area of the substrate 100 exposed to the first opening 220, the area of the substrate 100 exposed to the second opening 230, and the area of the substrate 100 exposed to the third opening 240 are not equal, that is, at least two of the pixel opening areas are not equal, so that the sizes of the light-emitting units 300 located in the first opening 220, the second opening 230, and the third opening 240 are at least two not equal, thereby adjusting the volume of each pixel opening and the effective light-emitting area of the light-emitting unit 300. The larger the area of the substrate 100 exposed to the pixel opening, the thinner the film thickness of the light-emitting unit 300 when the light-emitting unit 300 is formed in the pixel opening; the smaller the area of the substrate 100 exposed to the pixel opening, the thicker the film thickness of the light-emitting unit 300 when the light-emitting unit 300 is formed in the pixel opening. It is necessary to adjust the film thickness of the light-emitting unit 300 by adjusting both the angle and the area of the substrate 100 exposed to the pixel opening to realize the optical microcavity.

[0056] In these alternative embodiments, a first electrode layer 410 and a second electrode layer 460 are respectively disposed on the side of the light-emitting unit 300 facing the substrate 100 and the side facing away from the substrate 100. The light emitted by the light-emitting unit 300 forms a resonant cavity, that is, an optical microcavity, through the reflection of the first electrode layer 410 and the second electrode layer 460. The film thickness of the light-emitting unit 300 is the cavity length of the microcavity. When the cavity length of the microcavity satisfies the condition of constructive interference with the wavelength of the light emitted by the light-emitting unit 300, enhanced output of the wavelength can be achieved.

[0057] Optionally, the first electrode layer 410 is an anode and the second electrode layer 460 is a cathode.

[0058] Optionally, as Figure 2As shown, a first electrode layer 410 is disposed between the substrate 100 and the pixel defining layer 200. The first electrode layer 410 is used to drive the light-emitting unit 300 to emit light. The light of the light-emitting unit 300 is incident on the first electrode layer 410 and then reflected by the first electrode layer 410 and emitted from the front of the display panel. The areas of the first electrode layer 410 exposed to the first opening 220, the second opening 230, and the third opening 240 are equal, which makes the process of manufacturing the pixel defining layer 200 easier. When forming the optical microcavity structure, the volumes of the first opening 220, the second opening 230, and the third opening 240 can be adjusted only by adjusting the first angle θ1, the second angle θ2, and the third angle θ3 to realize the optical microcavities of different color light-emitting units 300. Among them, the area of the first electrode layer 410 exposed to the first opening 220 is the area where the first electrode layer 410 is exposed through one of the first openings 220, the area of the first electrode layer 410 exposed to the second opening 230 is the area where the first electrode layer 410 is exposed through one of the second openings 230, and the area of the first electrode layer 410 exposed to the third opening 240 is the area where the first electrode layer 410 is exposed through one of the third openings 240.

[0059] Alternatively, at least two of the areas of the first electrode layer 410 exposed to the first opening 220, the second opening 230, and the third opening 240 are not equal, so that at least two of the sizes of the light-emitting units 300 located in the first opening 220, the second opening 230, and the third opening 240 are not equal, thereby enabling the adjustment of the effective light-emitting area of the light-emitting units 300 in the entire pixel opening.

[0060] Optionally, as Figure 2 shown, the pixel defining layer 200 is disposed on the side of the first electrode layer 410 away from the substrate 100. The first angle θ1 can be the angle between the side wall of the pixel defining layer 200 facing the first opening 220 and the surface of the first electrode layer 410 on the side away from the substrate 100. The second angle θ2 can be the angle between the side wall of the pixel defining layer 200 facing the second opening 230 and the surface of the first electrode layer 410 on the side away from the substrate 100. The third angle θ3 can be the angle between the side wall of the pixel defining layer 200 facing the third opening 240 and the surface of the first electrode layer 410 on the side away from the substrate 100.

[0061] Optionally, the first angle θ1 is the angle between the side wall of the pixel defining layer 200 facing the first opening 220 and a reference plane parallel to the display plane. The second angle θ2 can be the angle between the side wall of the pixel defining layer 200 facing the second opening 230 and a reference plane parallel to the display plane. The third angle θ3 can be the angle between the side wall of the pixel defining layer 200 facing the third opening 240 and a reference plane parallel to the display plane.

[0062] Optionally, along the direction perpendicular to the substrate 100, the heights of the pixel defining layers 200 between the pixel openings are equal. During the manufacturing process of the pixel defining layer 200, the material of the pixel defining layer 200 is coated, exposed, and developed to form a shape, and the heights of the pixel defining layer 200 are set to be equal, which makes the process implementation easier during manufacturing.

[0063] As Figure 3 and Figure 4 shown, in some alternative embodiments, the ratio range of the volume of the first opening 220 to the volume of the second opening 230 is 1.273 - 1.283, and the ratio range of the volume of the first opening 220 to the volume of the third opening 240 is 1.528 - 1.538.

[0064] In these alternative embodiments, the first opening 220, the second opening 230, and the third opening 240 may be frustum - shaped structures jointly formed by the side of the substrate 100 exposed to the pixel opening and the pixel defining layer 200. The side of the substrate 100 exposed to the pixel opening is the lower base of the frustum - shaped structure, the side of the pixel opening facing away from the substrate 100 is the upper base of the frustum - shaped structure, and the wall surface of the pixel defining layer 200 facing the pixel opening is the side surface of the frustum structure.

[0065] The volume V1 of the first opening 220 is calculated by the following formula:

[0066] V1 = L1 * h1 * d1 + h1 2 (L1 + 2d1) * cotθ1 + 2 * h1 3 *(cotθ1) 2

[0067] wherein, L1 is the width of the substrate 100 exposed to the first opening 220, d1 is the length of the substrate 100 exposed to the first opening 220, wherein the directions of the width and length of the substrate 100 exposed to the first opening 220 are perpendicular to each other, h1 is the height of the first opening 220 along the direction perpendicular to the substrate 100, and θ1 is the first angle.

[0068] The volume V2 of the second opening 230 is calculated by the following formula:

[0069] V2 = L2 * h2 * d2 + h2 2 (L2 + 2d2) * cotθ2 + 2 * h2 3 *(cotθ2) 2

[0070] Wherein, L2 is the width of the substrate 100 exposed to the second opening 230, d2 is the length of the substrate 100 exposed to the second opening 230, wherein the directions of the width and length of the substrate 100 exposed to the second opening 230 are perpendicular to each other, h2 is the height of the second opening 230 in the direction perpendicular to the substrate 100, and θ2 is the second angle.

[0071] The volume V3 of the third opening 240 is calculated by the following formula:

[0072] V3 = L3 * h3 * d3 + h3 2 (L3 + 2d3) * cotθ3 + 2 * h3 3 * (cotθ3) 2

[0073] Wherein, L3 is the width of the substrate 100 exposed to the third opening 240, d3 is the length of the substrate 100 exposed to the third opening 240, the directions of the width and length of the substrate 100 exposed to the third opening 240 are perpendicular to each other, h3 is the height of the third opening 240 in the direction perpendicular to the substrate 100, and θ3 is the third angle.

[0074] Optionally, the first opening 220, the second opening 230, and the third opening 240 are frustum structures.

[0075] Through the above formula, the volumes of the first opening 220, the second opening 230, and the third opening 240 can be calculated. The ratio range of the volume of the first opening 220 to the volume of the second opening 230 is 1.273 - 1.283, and the ratio range of the volume of the first opening 220 to the volume of the third opening 240 is 1.528 - 1.538. By forming the red light-emitting unit 310 that emits red light in the first opening 220, the green light-emitting unit 320 that emits green light in the second opening 230, and the blue light-emitting unit 330 that emits blue light in the third opening 240, the red light-emitting unit 310, the green light-emitting unit 320, and the blue light-emitting unit 330 can all reach the second-order microcavity, improving the display effect of the display panel.

[0076] The following is an example for illustration:

[0077] L1 = L2 = L3 = 6, d1 = d2 = d3 = 7, h1 = h2 = h3 = 1.5, θ1 = 30°, θ2 = 40°, θ3 = 50.2°. Substituting these values into the calculation formulas for the volume V1 of the first opening 220, the volume V2 of the second opening 230, and the volume V3 of the third opening 240, we can obtain:

[0078] Substituting into the calculation formulas for the volume V1 of the first opening 220, the volume V2 of the second opening 230, and the volume V3 of the third opening 240, we can get:

[0079] V1 = 63 + 45cotθ1 + 6.75(cotθ1) 2 = 161.192

[0080] V2 = 63 + 45 cotθ2 + 6.75(cotθ2) 2 = 126.216

[0081] V3 = 63 + 45 cotθ2 + 6.75(cotθ2) 2 = 105.178

[0082] It can be obtained that the ratio of the volume of the first opening 220 to the volume of the second opening 230 is: V1 / V2 = 1.277, and the ratio of the volume of the first opening 220 to the volume of the third opening 240 is: V1 / V3 = 1.533. The red light-emitting unit 310, the second light-emitting unit, the green light-emitting unit 320, and the third light-emitting unit, the blue light-emitting unit 330, all reach the second-order microcavity. Optionally, the ratio of the volume of the first opening 220 to the volume of the second opening 230 is 1.275, 1.277, 1.278, 1.280, etc., and the ratio of the volume of the first opening 220 to the volume of the third opening 240 is 1.530, 1.533, 1.535, etc. At this time, the red light-emitting unit 310, the green light-emitting unit 320, and the blue light-emitting unit 330 achieve a better second-order microcavity effect.

[0083] Optionally, the thickness of the red light-emitting unit 310 in the direction perpendicular to the substrate 100 is 227 - 233 nanometers, the thickness of the green light-emitting unit 320 in the direction perpendicular to the substrate 100 is 177 - 183 nanometers, and the thickness of the blue light-emitting unit 330 in the direction perpendicular to the substrate 100 is 147 - 153 nanometers. Within the above range, the red light-emitting unit 310 that emits red light, the green light-emitting unit 320 that emits green light, and the blue light-emitting unit 330 that emits blue light can reach the second-order microcavity.

[0084] As Figure 3 and Figure 4 shown, in some alternative embodiments, the ratio range of the volume of the first opening 220 to the volume of the second opening 230 is 1.237 - 1.247, and the ratio range of the volume of the first opening 220 to the volume of the third opening 240 is 1.513 - 1.523.

[0085] In these alternative embodiments, the ratio range of the volume of the first opening 220 to the volume of the second opening 230 calculated by the above formula is 1.237 - 1.247, and the ratio range of the volume of the first opening 220 to the volume of the third opening 240 is 1.513 - 1.523. The red light-emitting red light-emitting unit 310 is formed in the first opening 220, the green light-emitting green light-emitting unit 320 is formed in the second opening 230, and the blue light-emitting blue light-emitting unit 330 is formed in the third opening 240, which can make the red light-emitting unit 310, the green light-emitting unit 320, and the blue light-emitting unit 330 all reach the third-order microcavity, improving the display effect of the display panel.

[0086] Optionally, the ratio of the volume of the first opening 220 to the volume of the second opening 230 is 1.239, 1.242, 1.245, etc., and the ratio of the volume of the first opening 220 to the volume of the third opening 240 is 1.515, 1.518, 1.520, etc. At this time, the red light-emitting unit 310, the green light-emitting unit 320, and the blue light-emitting unit 330 achieve better third-order microcavity effects.

[0087] Optionally, the thickness of the red light-emitting red light-emitting unit 310 in the direction perpendicular to the substrate 100 is 407 - 413 nanometers, the thickness of the green light-emitting green light-emitting unit 320 in the direction perpendicular to the substrate 100 is 327 - 333 nanometers, and the thickness of the blue light-emitting blue light-emitting unit 330 in the direction perpendicular to the substrate 100 is 267 - 273 nanometers. Within the above range, the red light-emitting red light-emitting unit 310, the green light-emitting green light-emitting unit 320, and the blue light-emitting blue light-emitting unit 330 can reach the third-order microcavity. As Figure 4 and Figure 5 shown, in some alternative embodiments, the ratio range of the volume of the first opening 220 to the volume of the second opening 230 is 1.224 - 1.234, and the ratio range of the volume of the first opening 220 to the volume of the third opening 240 is 1.470 - 1.480.

[0088] In these alternative embodiments, the ratio range of the volume of the first opening 220 to the volume of the second opening 230 calculated by the above formula is 1.224 - 1.234, and the ratio range of the volume of the first opening 220 to the volume of the third opening 240 is 1.470 - 1.480. The red light-emitting red light-emitting unit 310 is formed in the first opening 220, the green light-emitting green light-emitting unit 320 is formed in the second opening 230, and the blue light-emitting blue light-emitting unit 330 is formed in the third opening 240, which can make the red light-emitting unit 310, the green light-emitting unit 320, and the blue light-emitting unit 330 all reach the fourth-order microcavity, improving the display effect of the display panel.

[0089] Optionally, the ratio of the volume of the first opening 220 to the volume of the second opening 230 is 1.226, 1.229, 1.232, etc., and the ratio of the volume of the first opening 220 to the volume of the third opening 240 is 1.473, 1.475, 1.478, etc. At this time, the red light-emitting unit 310, the green light-emitting unit 320, and the blue light-emitting unit 330 achieve a better effect of a fourth-order microcavity.

[0090] Optionally, the thickness of the red light-emitting unit 310 in the direction perpendicular to the substrate 100 is 587 - 593 nanometers, the thickness of the green light-emitting unit 320 in the direction perpendicular to the substrate 100 is 477 - 483 nanometers, and the thickness of the blue light-emitting unit 330 in the direction perpendicular to the substrate 100 is 397 - 403 nanometers. Within the above range, the red light-emitting unit 310 that emits red light, the green light-emitting unit 320 that emits green light, and the blue light-emitting unit 330 that emits blue light can achieve a fourth-order microcavity.

[0091] As Figure 5 and Figure 6 shown, in some alternative embodiments, the red light-emitting unit 310 includes a first hole injection layer 421, a first hole transport layer 431, a first quantum dot light-emitting layer 441, and a first electron transport layer 451 that are sequentially stacked; the green light-emitting unit 320 includes a second hole injection layer 422, a second hole transport layer 432, a second quantum dot light-emitting layer 442, and a second electron transport layer 452 that are sequentially stacked; the blue light-emitting unit 330 includes a third hole injection layer 423, a third hole transport layer 433, a third quantum dot light-emitting layer 443, and a third electron transport layer 453 that are sequentially stacked; wherein, in the direction perpendicular to the substrate 100, the thickness of the first hole injection layer 421 is greater than the thickness of the second hole injection layer 422, the thickness of the second hole injection layer 422 is greater than the thickness of the third hole injection layer 423, the thickness of the first hole transport layer 431 is greater than the thickness of the second hole transport layer 432, the thickness of the second hole transport layer 432 is greater than the thickness of the third hole transport layer 433, the thickness of the first electron transport layer 451 is greater than the thickness of the second electron transport layer 452, and the thickness of the second electron transport layer 452 is greater than the thickness of the third electron transport layer 453.

[0092] In these alternative embodiments, the light-emitting unit 300 includes a hole injection layer 420, a hole transport layer 430, a quantum dot light-emitting layer 440, and an electron transport layer 450 that are sequentially stacked in a direction away from the substrate 100. A first electrode layer 410 is disposed on the side of the light-emitting unit 300 facing the substrate 100, and a second electrode layer 460 is disposed on the side of the light-emitting unit 300 facing away from the substrate 100. The light emitted by the light-emitting unit 300 is reflected on the first electrode layer 410 and the second electrode layer 460 to form an optical microcavity. The thicknesses of the sequentially stacked hole injection layer 420, hole transport layer 430, quantum dot light-emitting layer 440, and electron transport layer 450 are the cavity lengths of the optical microcavity. When the hole injection layer 420, hole transport layer 430, quantum dot light-emitting layer 440, and electron transport layer 450 are formed by coating the entire surface, adjusting the first angle θ1, the second angle θ2, and the third angle θ3 can adjust the film thicknesses of the hole injection layer 420, hole transport layer 430, and electron transport layer 450 in the first opening 220, the second opening 230, and the third opening 240, that is, the cavity length of the optical microcavity is adjusted, so that the cavity lengths of the microcavities in the first opening 220, the second opening 230, and the third opening 240 respectively satisfy the condition of constructive interference with red light, green light, and blue light, and the enhancement of the wavelength of red, green, and blue can be achieved, improving the display effect of the display panel.

[0093] The thickness of the first hole injection layer 421 is greater than the thickness of the second hole injection layer 422, the thickness of the second hole injection layer 422 is greater than the thickness of the third hole injection layer 423, the thickness of the first hole transport layer 431 is greater than the thickness of the second hole transport layer 432, the thickness of the second hole transport layer 432 is greater than the thickness of the third hole transport layer 433, the thickness of the first electron transport layer 451 is greater than the thickness of the second electron transport layer 452, and the thickness of the second electron transport layer 452 is greater than the thickness of the third electron transport layer 453. As a result, the thickness of the red light-emitting unit 310 is greater than the thickness of the green light-emitting unit 320, and the thickness of the green light-emitting unit 320 is greater than the thickness of the blue light-emitting unit 330. By adjusting the thicknesses of the three functional layers, the red light-emitting unit 310, the green light-emitting unit 320, and the blue light-emitting unit 330 form optical microcavities, realizing the selection and enhancement of the light emitted by different color light-emitting units 300, improving the monochromaticity of the device light emission, and thus improving the process performance of the display panel.

[0094] As Figure 6 shown, in some alternative embodiments, a first electrode layer 410 is disposed on the side of the light-emitting unit 300 facing the substrate 100, and a second electrode layer 460 is disposed on the side of the light-emitting unit 300 facing away from the substrate 100. The first electrode layer 410 includes a light-reflecting material, and the second electrode layer 460 includes a semi-transparent material.

[0095] In these alternative embodiments, the first electrode 410 includes a light-reflecting material. The light emitted by the light-emitting unit 300 is incident on the light-reflecting material and is reflected towards the second electrode layer 460. The second electrode layer 460 includes a translucent material. The light emitted by the light-emitting unit 300 is emitted outwards through the second electrode layer 460. The display panel in this embodiment is a top-emission device. The second electrode layer 460 is made of a metal material. Some of the light generated by the light-emitting unit 300 passes through the translucent second electrode layer 460, while the rest is reflected back. When the resonance frequency of the light matches the resonance frequency of the reflected light, strong light about 1.5 to 2 times stronger than the original emitted light passes through the second electrode layer 460, thereby improving the light efficiency.

[0096] An embodiment of the second aspect of the present application further provides a display device, including the display panel of any one of the embodiments of the first aspect above.

[0097] Since the display device provided by the embodiment of the second aspect of the present application includes the display panel of any one of the embodiments of the first aspect above, the display device provided by the embodiment of the second aspect of the present application has the beneficial effects of the display panel of any one of the embodiments of the first aspect above, which will not be elaborated here.

[0098] The display device in the embodiments of the present application includes, but is not limited to, devices with a display function such as mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline telephones, consoles, etc.

[0099] An embodiment of the third aspect of the present application further provides a manufacturing method of a display panel for manufacturing the display panel of any one of the embodiments of the first aspect above, as Figure 7 shown, including the following steps:

[0100] Step S1: Provide a substrate 100.

[0101] Step S2: Form a pixel defining layer 200 on one side of the substrate 100. The pixel defining layer 200 and the substrate 100 enclose a first opening 220, a second opening 230, and a third opening 240. There is a first angle θ1 between the side wall of the pixel defining layer 200 facing the first opening 220 and the substrate 100, a second angle θ2 between the side wall of the pixel defining layer 200 facing the second opening 230 and the substrate 100, and a third angle θ3 between the side wall of the pixel defining layer 200 facing the third opening 240 and the substrate 100. The first angle θ1 is less than the second angle θ2, and the second angle θ2 is less than the third angle θ3.

[0102] Step S3: Fill the hole injection layer material into the first opening 220, the second opening 230, and the third opening 240, and dry the hole injection layer material in the first opening 220 to form a first hole injection layer 421, dry the hole injection layer material in the second opening 230 to form a second hole injection layer 422, and dry the hole injection layer material in the third opening 240 to form a third hole injection layer 423.

[0103] Step S4: Fill the hole transport layer material into the first opening 220, the second opening 230, and the third opening 240, and dry the hole transport layer material in the first opening 220 to form a first hole transport layer 431, dry the hole transport layer material in the second opening 230 to form a second hole transport layer 432, and dry the hole transport layer material in the third opening 240 to form a third hole transport layer 433.

[0104] Step S5: Form a first quantum dot light-emitting layer 441 in the first opening 220, and the first quantum dot light-emitting layer 441 is used to emit red light; form a second quantum dot light-emitting layer 442 in the second opening 230, and the second quantum dot light-emitting layer 442 is used to emit green light; form a third quantum dot light-emitting layer 443 in the third opening 240, and the third quantum dot light-emitting layer 443 is used to emit blue light.

[0105] Step S6: Fill the electron transport layer material into the first opening 220, the second opening 230, and the third opening 240, and dry the electron transport layer material in the first opening 220 to form a first electron transport layer 451, dry the electron transport layer material in the second opening 230 to form a second electron transport layer 452, and dry the electron transport layer material in the third opening 240 to form a third electron transport layer 453.

[0106] In this embodiment, a pixel defining layer 200 is formed on one side of a substrate 100. A first opening 220 is formed by enclosing the pixel defining layer 200 and the substrate 100. The volume of the first opening 220 can be adjusted by adjusting a first angle θ1. A second opening 230 is formed by enclosing the pixel defining layer 200 and the substrate 100. The volume of the second opening 230 can be adjusted by adjusting a second angle θ2. A third opening 240 is formed by enclosing the pixel defining layer 200 and the substrate 100. The volume of the third opening 240 can be adjusted by adjusting a third angle θ3. The larger the angle of the included angle, the more the sidewall inclines towards the pixel opening direction, and the smaller the volume of the opening. The smaller the angle, the more the sidewall inclines away from the pixel opening direction, and the larger the volume of the pixel opening. By adjusting the first angle θ1, the second angle θ2, and the third angle θ3, the volumes of the first opening 220, the second opening 230, and the third opening 240 are adjusted, and further the volumes for accommodating the hole injection layer material, the hole transport layer material, and the electron transport layer material when forming a light-emitting unit 300 in the first opening 220, the second opening 230, and the third opening 240 are adjusted. The first angle θ1 is less than the second angle θ2, and the second angle θ2 is less than the third angle θ3, that is, the volumes of the hole injection layer material, the hole transport layer material, and the electron transport layer material in the first opening 220, the second opening 230, and the third opening 240 are different, and when drying to form a film, the film layer thicknesses are different. The manufacturing method in this embodiment can adjust the angle between the sidewall of the pixel defining layer 200 facing the pixel opening and the substrate 100, so as to adjust the thickness of the light-emitting unit 300 in the pixel opening, thereby forming an optical microcavity, realizing the selection and enhancement of the light emitted by different color light-emitting units 300, improving the monochromaticity of the device light emission, and thus enhancing the process performance of the display panel.

[0107] Optionally, along the direction perpendicular to the substrate, the thickness of the first hole injection layer 421 is greater than the thickness of the second hole injection layer 422, and the thickness of the second hole injection layer 422 is greater than the thickness of the third hole injection layer 423; along the direction perpendicular to the substrate 100, the thickness of the first hole transport layer 431 is greater than the thickness of the second hole transport layer 432, and the thickness of the second hole transport layer 432 is greater than the thickness of the third hole transport layer 433; along the direction perpendicular to the substrate 100, the thickness of the first electron transport layer 451 is greater than the thickness of the second electron transport layer 452, and the thickness of the second electron transport layer 452 is greater than the thickness of the third electron transport layer 453.

[0108] In some alternative embodiments, in the step of forming the pixel defining layer 200 on one side of the substrate 100, the following steps are further included:

[0109] After coating an adhesive layer on one side of the substrate 100 and then performing exposure and development, a pixel defining layer 200 that encloses to form a first opening 220 is obtained. After coating an adhesive layer on one side of the substrate 100 and then performing exposure and development, a pixel defining layer 200 that encloses to form a second opening 230 is obtained. After coating an adhesive layer on one side of the substrate 100 and then performing exposure and development, a pixel defining layer 200 that encloses to form a third opening 240 is obtained.

[0110] In some alternative embodiments, in the step of forming the pixel defining layer 200 on one side of the substrate 100, the following steps are further included:

[0111] Coat an adhesive layer on one side of the substrate to form the pixel defining layer 200, and etch the adhesive layer through a photolithography process to form a first opening 220, a second opening 230, and a third opening 240.

[0112] In some alternative embodiments, before the step of forming the pixel defining layer 200 on one side of the substrate 100, the following steps are further included:

[0113] Form a first electrode layer 410 on one side of the substrate 100. In these alternative embodiments, the positive projection of the first electrode layer 410 on the substrate 100 overlaps at least partially with the first opening 220, the second opening 230, and the third opening 240.

[0114] In some alternative embodiments, the following steps are further included:

[0115] Form a second electrode layer 460 on the side of the light-emitting unit 300 facing away from the substrate.

[0116] In some alternative embodiments, the light-emitting unit 300 includes a red light-emitting unit 310, a green light-emitting unit 320, and a blue light-emitting unit 330. The red light-emitting unit 310 is disposed in the first opening 220, the green light-emitting unit 320 is disposed in the second opening 230, and the blue light-emitting unit 330 is disposed in the third opening 240. The red light-emitting unit 310 is used to emit red light, the green light-emitting unit 320 is used to emit green light, and the blue light-emitting unit 330 is used to emit blue light. Among them, the first angle θ1 is less than the second angle θ2, and the second angle θ2 is less than the third angle θ3. The thickness of the red light-emitting unit 310 in the direction perpendicular to the substrate 100 is greater than the thickness of the green light-emitting unit 320 in the direction perpendicular to the substrate 100, and the thickness of the green light-emitting unit 320 in the direction perpendicular to the substrate 100 is greater than the thickness of the blue light-emitting unit 330 in the direction perpendicular to the substrate 100.

[0117] In some alternative embodiments, the ratio range of the volume of the first opening 220 to the volume of the second opening 230 is 1.273 - 1.283, and the ratio range of the volume of the first opening 220 to the volume of the third opening 240 is 1.528 - 1.538.

[0118] In some alternative embodiments, the ratio of the volume of the first opening 220 to the volume of the second opening 230 ranges from 1.237 to 1.247, and the ratio of the volume of the first opening 220 to the volume of the third opening 240 ranges from 1.513 to 1.523.

[0119] In some alternative embodiments, the ratio of the volume of the first opening 220 to the volume of the second opening 230 ranges from 1.224 to 1.234, and the ratio of the volume of the first opening 220 to the volume of the third opening 240 ranges from 1.470 to 1.480.

[0120] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, characterized in that, include: substrate; A pixel defining layer is provided on one side of the substrate, wherein the pixel defining layer encloses a plurality of pixel openings, and the pixel openings include a first opening, a second opening, and a third opening; a light-emitting unit, comprising a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit, wherein the red light-emitting unit is disposed at the first opening, the green light-emitting unit is disposed at the second opening, and the blue light-emitting unit is disposed at the third opening; wherein a first angle is formed between the sidewall of the pixel defining layer facing the first opening and the substrate, a second angle is formed between the sidewall of the pixel defining layer facing the second opening and the substrate, and a third angle is formed between the sidewall of the pixel defining layer facing the third opening and the substrate, the first angle being smaller than the second angle, and the second angle being smaller than the third angle; Along a direction perpendicular to the substrate, the thickness of the red light-emitting unit is greater than that of the green light-emitting unit, and the thickness of the green light-emitting unit is greater than that of the blue light-emitting unit.

2. The display panel according to claim 1, wherein The area of the substrate exposed to the first opening, the area of the substrate exposed to the second opening, and the area of the substrate exposed to the third opening are all equal or at least the two are different; Preferably, a first electrode layer is provided between the substrate and the pixel defining layer, and an area of the first electrode layer exposed to the first opening, an area of the first electrode layer exposed to the second opening, and an area of the first electrode layer exposed to the third opening are equal or at least unequal; Preferably, along a direction perpendicular to the substrate, the heights of the pixel defining layers between the pixel openings are equal; Preferably, a second electrode layer is provided on the side of the light-emitting unit facing away from the substrate.

3. The display panel according to claim 2, wherein, The first opening volume V1 is calculated by the following formula: V1 = L1 * h1 * d1 + h1 2 (L1 + 2d1) * cotθ1 + 2 * h1 3 *(cotθ1) 2 Wherein, L1 is the width of the substrate exposed in the first opening, d1 is the length of the substrate exposed in the first opening, h1 is the height of the first opening in a direction perpendicular to the substrate, θ1 is the first angle, and the directions in which the width and length of the substrate exposed in the first opening are perpendicular to each other; The second opening volume V2 is calculated by the following formula: V2 = L2 * h2 * d2 + h2 2 (L2 + 2d2) * cotθ2 + 2 * h2 3 *(cotθ2) 2 Wherein, L2 is the width of the substrate exposed in the second opening, d2 is the length of the substrate exposed in the second opening, h2 is the height of the second opening in a direction perpendicular to the substrate, θ2 is the second angle, and the directions in which the width and length of the substrate exposed in the second opening are perpendicular to each other; The third opening volume V3 is calculated by the following formula: V3 = L3 * h3 * d3 + h3 2 (L3 + 2d3) * cotθ3 + 2 * h3 3 *(cotθ3) 2 Wherein L3 is the width of the substrate exposed in the third opening, d3 is the length of the substrate exposed in the third opening, h3 is the height of the third opening in a direction perpendicular to the substrate, θ3 is the third angle, and the directions in which the width and length of the substrate exposed in the third opening are perpendicular to each other.

4. The display panel according to claim 3, characterized in that, The ratio of the volume of the first opening to the volume of the second opening is in a range of 1.273-1.283, and the ratio of the volume of the first opening to the volume of the third opening is in a range of 1.528-1.538; Preferably, the thickness of the red light-emitting unit in the direction perpendicular to the substrate is 227-233 nanometers, the thickness of the green light-emitting unit in the direction perpendicular to the substrate is 177-183 nanometers, and the thickness of the blue light-emitting unit in the direction perpendicular to the substrate is 147-153 nanometers.

5. The display panel according to claim 3, wherein, The ratio range of the volume of the first opening to the volume of the second opening is 1.237-1.247, and the ratio range of the volume of the first opening to the volume of the third opening is 1.513-1.523; Preferably, the thickness of the red light-emitting unit in the direction perpendicular to the substrate is 407-413 nanometers, the thickness of the green light-emitting unit in the direction perpendicular to the substrate is 327-333 nanometers, and the thickness of the blue light-emitting unit in the direction perpendicular to the substrate is 267-273 nanometers.

6. The display panel according to claim 3, wherein, The ratio range of the volume of the first opening to the volume of the second opening is 1.224-1.234, and the ratio range of the volume of the first opening to the volume of the third opening is 1.470-1.480; Preferably, the thickness of the red light-emitting unit in the direction perpendicular to the substrate is 587-593 nanometers, the thickness of the green light-emitting unit in the direction perpendicular to the substrate is 477-483 nanometers, and the thickness of the blue light-emitting unit in the direction perpendicular to the substrate is 397-403 nanometers.

7. The display panel according to claim 1, wherein The red light-emitting unit includes a first hole injection layer, a first hole transport layer, a first quantum dot light-emitting layer, and a first electron transport layer that are sequentially stacked. The green light-emitting unit includes a second hole injection layer, a second hole transport layer, a second quantum dot light-emitting layer, and a second electron transport layer that are sequentially stacked. The blue light-emitting unit includes a third hole injection layer, a third hole transport layer, a third quantum dot light-emitting layer, and a third electron transport layer that are sequentially stacked; Among them, in the direction perpendicular to the substrate, the thickness of the first hole injection layer is greater than the thickness of the second hole injection layer, the thickness of the second hole injection layer is greater than the thickness of the third hole injection layer, the thickness of the first hole transport layer is greater than the thickness of the second hole transport layer, the thickness of the second hole transport layer is greater than the thickness of the third hole transport layer, the thickness of the first electron transport layer is greater than the thickness of the second electron transport layer, and the thickness of the second electron transport layer is greater than the thickness of the third electron transport layer.

8. The display panel according to claim 1, wherein A first electrode layer is provided on the side of the light-emitting unit facing the substrate, and a second electrode layer is provided on the side of the light-emitting unit facing away from the substrate. The first electrode layer includes a light-reflecting material, and the second electrode layer includes a semi-transparent material.

9. A display device, characterized in that, Including the display panel according to any one of claims 1-8.

10. A manufacturing method of a display panel for manufacturing the display panel according to any one of claims 1-8, characterized in that, Including: Providing the substrate; The pixel defining layer is formed on one side of the substrate. The pixel defining layer and the substrate enclose to form the first opening, the second opening, and the third opening. There is a first angle between the side wall of the pixel defining layer facing the first opening and the substrate, a second angle between the side wall of the pixel defining layer facing the second opening and the substrate, and a third angle between the side wall of the pixel defining layer facing the third opening and the substrate. The first angle is less than the second angle, and the second angle is less than the third angle; The hole injection layer material is filled in the first opening, the second opening, and the third opening. The hole injection layer material located in the first opening is dried to form a first hole injection layer, the hole injection layer material located in the second opening is dried to form a second hole injection layer, and the hole injection layer material located in the third opening is dried to form a third hole injection layer; The hole transport layer material is filled in the first opening, the second opening, and the third opening. The hole transport layer material located in the first opening is dried to form a first hole transport layer, the hole transport layer material located in the second opening is dried to form a second hole transport layer, and the hole transport layer material located in the third opening is dried to form a third hole transport layer; A first quantum dot light emitting layer is formed in the first opening, the first quantum dot light emitting layer is used for emitting red light, a second quantum dot light emitting layer is formed in the second opening, the second quantum dot light emitting layer is used for emitting green light, and a third quantum dot light emitting layer is formed in the third opening, the third quantum dot light emitting layer is used for emitting blue light; The electron transport layer material is filled in the first opening, the second opening, and the third opening. The electron transport layer material located in the first opening is dried to form a first electron transport layer, the electron transport layer material located in the second opening is dried to form a second electron transport layer, and the electron transport layer material located in the third opening is dried to form a third electron transport layer.

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