Display panel, display device and preparation method of display panel
By adopting periodic grooves and convex structures and hollow electrode layer design in the OLED display panel, the problem of low light extraction efficiency of OLED devices is solved, and the display effect of efficient light emission and low power consumption is achieved.
Patent Information
- Application Number
- CN202410101327.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-24
- Publication Date
- 2025-07-25
AI Technical Summary
The light extraction efficiency of existing OLED devices is low, resulting in luminous efficiency and power consumption problems.
The display panel adopts a periodically alternately arranged grooves and convex structure, combined with the hollow electrode layer design, changes the light output direction of the light emitting device, cuts off the current path, reduces the opening voltage, improves the luminous efficiency and reduces power consumption.
It improves the light extraction efficiency of OLED devices, improves the luminous efficiency, reduces the power consumption of the light emitting device, and improves the black visual effect and color temperature stability of the display panel.
Smart Images
Figure CN120379461A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of display technologies, and in particular, to a display panel, a display device, and a method for manufacturing a display panel. Background Art
[0002] Organic Light-Emitting Diode (OLED) has excellent characteristics such as self-luminescence, wide viewing angle, high contrast, low power consumption, thin thickness, high response rate, can be used for flexible panels, wide operating temperature range, full colorization, and relatively simple structure and manufacturing process, and is increasingly favored by users. However, there is a huge difference between the external quantum efficiency and the internal quantum efficiency of OLED devices, resulting in a light extraction efficiency of only about 20% for OLED devices. Therefore, how to improve the light extraction efficiency of OLED devices has become an urgent problem to be solved. Summary of the Invention
[0003] Embodiments of the present application provide a display panel, a display device, and a method for manufacturing a display panel to solve or alleviate one or more technical problems in the prior art.
[0004] As an aspect of the embodiments of the present application, the embodiments of the present application provide a display panel, including: a substrate and a flat layer located on one side of the substrate, the side of the flat layer away from the substrate includes periodically alternating grooves and protrusions; a light-emitting device layer, located on the side of the flat layer away from the substrate, includes a plurality of light-emitting devices, the light-emitting device includes a first electrode layer, a pixel definition layer, a light-emitting unit layer, and a second electrode layer stacked, the pixel definition layer defines a plurality of pixel openings, the pixel openings expose a partial area of the first electrode layer, the light-emitting unit layer covers the area of the first electrode layer exposed by the pixel openings, and the maximum thickness of the light-emitting unit layer at the grooves is greater than the maximum thickness of the light-emitting unit layer at the protrusions; within the pixel openings, the first electrode layer and / or the second electrode layer includes a hollow structure.
[0005] In one embodiment, the first electrode layer includes a plurality of electrode segments, and / or the second electrode layer includes a plurality of electrode segments; wherein, a hollow structure is formed between two adjacent electrode segments; the orthographic projection of the electrode segment on the substrate overlaps with the orthographic projection of the protrusion on the substrate, and the orthographic projection of the hollow structure on the substrate overlaps with the orthographic projection of the groove on the substrate.
[0006] In one embodiment, the hollow structure is filled with an insulating material.
[0007] In one embodiment, a part of the light-emitting unit layer is located within the hollow structure.
[0008] In one embodiment, along the direction towards the substrate, the size of the groove gradually decreases, and the size of the protrusion gradually increases.
[0009] In one embodiment, the light-emitting unit layer forms a recess at the groove and a protrusion at the protrusion. The maximum distance between the side of the protrusion facing away from the substrate and the side of the recess facing the substrate is S1, and the distance between the symmetry axis of the protrusion and the symmetry axis of the adjacent recess is S2, where 0.4 ≤ S2 / S1 ≤ 0.6; wherein, the symmetry axes of the protrusion and the recess are both perpendicular to the substrate.
[0010] In one embodiment, the shape of the first electrode layer is adapted to the shape of the light-emitting unit layer; and / or, the shape of the second electrode layer is adapted to the shape of the light-emitting unit layer.
[0011] In one embodiment, along the arrangement direction of the grooves and protrusions, the size of the hollow structure is L1, and the size of the side of the groove away from the substrate is L2, where 0.4 ≤ L1 / L2 ≤ 0.6.
[0012] As another aspect of the embodiments of the present application, the embodiments of the present application provide a display device, including the display panel of any one of the above embodiments.
[0013] As yet another aspect of the embodiments of the present application, the embodiments of the present application provide a method for manufacturing a display panel, including: providing a substrate; forming a planar layer on one side of the substrate; wherein, the side of the planar layer away from the substrate includes periodically alternating grooves and protrusions; forming a light-emitting device layer on the side of the planar layer away from the substrate; wherein, the light-emitting device layer includes a plurality of light-emitting devices, and each light-emitting device includes a first electrode layer, a pixel definition layer, a light-emitting unit layer, and a second electrode layer stacked in sequence. The pixel definition layer defines a plurality of pixel openings, and the pixel openings expose a partial area of the first electrode layer. The light-emitting unit layer covers the area of the first electrode layer exposed by the pixel openings. The maximum thickness of the light-emitting unit layer at the groove is greater than the maximum thickness of the light-emitting unit layer at the protrusion; within the range of the pixel openings, the first electrode layer and / or the second electrode layer includes a hollow structure.
[0014] By adopting the above technical solutions, the embodiments of the present application can improve the light extraction efficiency of the light-emitting device, increase the light-emitting efficiency, and reduce the power consumption of the light-emitting device.
[0015] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the above-described illustrative aspects, embodiments, and features, further aspects, embodiments, and features of the present application will become apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in accordance with the present application and should not be considered as limiting the scope of the present application.
[0017] Figure 1 Schematic diagram showing the light output loss of the light-emitting device;
[0018] Figure 2 Schematic structural diagram of a light-emitting device according to an embodiment of the present application;
[0019] Figure 3 Show Figure 2 Top view of the light-emitting device shown in
[0020] Figure 4 Show Figure 2 Schematic diagram of the light emission of the light-emitting device shown in
[0021] Figure 5 Schematic partial structural diagram of a light-emitting device according to another embodiment of the present application;
[0022] Figure 6 Schematic structural diagram of a display panel according to an embodiment of the present application;
[0023] Figure 7 Schematic diagram of the preparation process of a display panel according to an embodiment of the present application;
[0024] Figure 8 Flow chart of the preparation method of a display panel according to an embodiment of the present application.
[0025] Explanation of reference numerals:
[0026] 10: Display panel; 100: Light-emitting device; 110: First electrode layer; 111: Electrode segment; 112: Light-absorbing material; 120: Light-emitting unit layer; 121: Recess; 122: Protrusion; 123: Hollow structure; 130: Second electrode layer; 200: Substrate; 300: Pixel definition layer; 310: Pixel opening; 400: Flat layer; 410: Groove; 420: Protrusion; 510: Gate metal layer; 520: Buffer layer; 530: Active layer; 541: First pole; 542: Second pole; 600: Encapsulation layer; 700: Conductive thin film layer. Detailed description of the embodiments
[0027] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the accompanying drawings and the description are considered to be exemplary in nature rather than restrictive.
[0028] In the related art, the main modes of light loss in light-emitting devices such as OLED devices include metal surface plasmon mode, waveguide mode, and substrate mode. Figure 1 A schematic diagram showing the light output loss of a light-emitting device is shown. Among them, A is the metal surface plasmon mode; B is the waveguide mode; C is the substrate mode; D is the light emitted into the external space. The light-emitting device includes a substrate 10, a first electrode layer 11, a light-emitting unit layer 12, and a second electrode layer 13 that are sequentially stacked. In the metal surface plasmon mode A, light is horizontally conducted along the surface of the first electrode layer 11 or the second electrode layer 12 and cannot be emitted into the external space. In the substrate mode C, light is refracted at the substrate 10 and also cannot be emitted into the external space. In the waveguide mode B, part of the light is confined in the substrate 10, the first electrode layer 11, the light-emitting unit layer 12, and the second electrode layer 13 in the form of a waveguide, and part of the light undergoes total reflection at the interface between the first electrode layer 11 and the substrate 10 and at the interface between the substrate 10 and the external space, so that the light emitted into the external space accounts for about 20% of the total light. Therefore, how to reduce the total reflection effect in OLED devices is an urgent problem to be solved.
[0029] Figure 2 A schematic structural diagram of a light-emitting device according to an embodiment of the present application is shown; Figure 3 Shown Figure 2 The top view of the light-emitting device shown in Figure 2 and Figure 3 As shown, the light-emitting device 100, such as an OLED device, includes a first electrode layer 110, a light-emitting unit layer 120, and a second electrode layer 130 that are stacked. Among them, the light-emitting unit layer 120 is formed into a wavy concave and convex region, and the concave and convex region includes a concave portion 121 and a convex portion 122. The top view of the concave and convex region is a hexagonal honeycomb structure. The concave and convex region can change the light-emitting direction of the light-emitting device 100, destroy the total reflection condition of the light-emitting device 100, reduce the total reflection effect in the light-emitting device 100, and thus improve the light output of the light-emitting device 100.
[0030] However, since the thickness of the concave portion 121 in the concave and convex region is greater than the thickness of the convex portion 122, the turn-on voltage of the concave portion 121 is very high, resulting in the convex portion 122 being the main light-emitting area of the light-emitting device 100. Figure 4 Shown Figure 2 The light-emitting schematic diagram of the light-emitting device 100 shown in Figure 4As shown, the convex portion 122 is the main light-emitting region. In the case of low voltage, the concave portion 121 does not emit light because the turn-on voltage is too high, resulting in a small light-emitting area. Moreover, the current density in the light-emitting region is too large, which will accelerate the aging of the light-emitting device 100. Also, in the case of low voltage, although no light is emitted from the concave portion 121, current still flows through this part, and this part of the current is ineffective current. The existence of the ineffective current will lead to a low current efficiency of the entire display panel 10, and greater power consumption is required to achieve the same brightness. Additionally, in the case of high voltage, the concave portion 121 will emit light. However, since the light wavelengths of the concave portion 121 and the convex portion 122 are different, the blue light ratio in the emitted white light is low, and the color temperature is low. To meet the usage requirements of a high color temperature, it is necessary to compensate for the blue pixels. Since the light-emitting efficiency of the blue pixels is low, the power consumption of the display panel 10 will increase. In addition, since the thickness of the concave portion 121 is greater than that of the convex portion 122, when external light enters, reflection will occur at the concave portion 121, resulting in a poor black visual effect of the display panel 10.
[0031] Figure 5 FIG. shows a partial structural schematic diagram of a light-emitting device 100 according to another embodiment of the present application; Figure 6 FIG. shows a structural schematic diagram of a display panel according to an embodiment of the present application. As Figure 5 - Figure 6 shown, the display panel 10 includes a substrate 200, a planarization layer 400, and a light-emitting device layer.
[0032] Specifically, on the side of the planarization layer 400 away from the substrate 200, there are periodically alternating grooves and protrusions. The light-emitting device layer is located on the side of the planarization layer 400 away from the substrate 200. The light-emitting device layer includes a plurality of light-emitting devices 100. In the description of the present application, "a plurality of" means two or more.
[0033] The light-emitting device 100 includes a first electrode layer 110, a pixel definition layer 300, a light-emitting unit layer 120, and a second electrode layer 130 which are stacked. The pixel definition layer 300 defines a plurality of pixel openings 310. The pixel openings 310 expose a partial area of the first electrode layer 110. The light-emitting unit layer 120 covers the area of the first electrode layer 110 exposed by the pixel openings 310. The maximum thickness of the light-emitting unit layer 120 at the grooves is greater than the maximum thickness of the light-emitting unit layer 120 at the protrusions. Within the range of the pixel openings 310, the first electrode layer 110 and / or the second electrode layer 130 includes a hollow structure.
[0034] Exemplarily, in combination with Figure 6, the pixel definition layer 300 may cover the edge of the first electrode layer 110. The display panel 10 may further include a driving structure layer located between the substrate 200 and the light-emitting device 100. Along the direction away from the substrate 200, the driving structure layer includes a gate metal layer 510, a buffer layer 520, an active layer 530, and a source-drain metal layer stacked in sequence. Among them, the source-drain metal layer includes a first electrode 541 and a second electrode 542, and the first electrode layer 110 is connected to the first electrode 541. Among them, one of the first electrode 541 and the second electrode 542 is a source electrode, and the other of the first electrode 541 and the second electrode 542 is a drain electrode. A packaging layer 600 may be provided on the side of the second electrode layer 130 away from the substrate 200.
[0035] Figure 7 FIG. shows a schematic diagram of the manufacturing process of the display panel 10 according to an embodiment of the present application. Exemplarily, when manufacturing the display panel 10, first, a plurality of grooves 410 may be formed on the pixel inner flat layer 400 through an exposure or etching process, and a protrusion is provided between two adjacent grooves 410. Then, a conductive thin film layer 700 is formed on the flat layer 400, and the conductive thin film layer 700 is wavy. Next, a part of the region of the conductive thin film layer 700 corresponding to the grooves 410 is removed through an etching process to form a hollow structure. After that, the light-emitting unit layer 120 and the second electrode layer 130 are sequentially vapor-deposited, so that both the light-emitting unit layer 120 and the second electrode layer 130 are wavy. Finally, a packaging layer 600 is formed on the side of the second electrode layer 130 away from the substrate 200.
[0036] Exemplarily, the first electrode layer 110 may be an anode layer, such as an ITO layer or an IGO layer; the second electrode layer 130 may be a cathode layer, such as an Mg layer or an Ag layer. A driving electric field may be formed between the first electrode layer 110 and the second electrode layer 130. During the driving of the display panel, holes are injected from the anode layer, electrons are injected from the cathode layer, and holes and electrons are combined in the light-emitting unit layer 120, thereby emitting light. Among them, the light-emitting unit layer 120 may sequentially include, along the direction from the first electrode layer 110 to the second electrode layer 130: a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL). Of course, the light-emitting unit layer 120 may also have other structures. For example, the light-emitting unit layer 120 may include: a hole transport layer, a light-emitting layer, and an electron transport layer. The present application does not limit the structure of the light-emitting unit layer 120.
[0037] In some embodiments, the light-emitting unit layer 120 forms a recess 121 at the groove and a protrusion 122 at the protrusion. That is, the orthographic projection of the groove on the substrate 200 overlaps with the orthographic projection of the recess 121 on the substrate 200; the orthographic projection of the protrusion on the substrate 200 overlaps with the orthographic projection of the protrusion 122 on the substrate 200. The periodically alternating recesses 121 and protrusions 122 can be formed into a wavy concave-convex region to change the light-emitting direction of the light-emitting device 100, break the total reflection condition of the light-emitting device 100, reduce the total reflection effect in the light-emitting device 100, thereby improving the light extraction efficiency of the light-emitting device 100 and increasing the light output.
[0038] According to the display panel 10 of the embodiment of the present application, by making the first electrode layer 110 and / or the second electrode layer 130 include a hollow structure within the pixel opening 310 range, the hollow structure can cut off the current path in the area of the light-emitting unit layer 120 at the groove, so that the current can all flow through the area of the light-emitting unit layer 120 at the protrusion. Since the maximum thickness of the light-emitting unit layer 120 at the groove is greater than the maximum thickness of the light-emitting unit layer 120 at the protrusion, the turn-on voltage of the light-emitting unit layer 120 at the protrusion is lower than that at the groove. Therefore, the current can all flow through the area with a lower turn-on voltage, and the luminous efficiency of the current is higher, reducing the power consumption of the light-emitting device 100. At the same time, the color point of the light emitted from the area of the light-emitting unit layer 120 at the protrusion is more stable, and by adjusting the thickness of the light-emitting unit layer 120, the color temperature of the emitted light can be better, further reducing the power consumption of the light-emitting device 100 on the premise of meeting the user's needs.
[0039] In one implementation, the first electrode layer 110 includes a plurality of electrode segments 111, and / or the second electrode layer 130 includes a plurality of electrode segments 111. That is, at least one of the first electrode layer 110 and the second electrode layer 130 includes a plurality of electrode segments 111. Among them, a hollow structure is formed between two adjacent electrode segments 111; the orthographic projection of the electrode segment 111 on the substrate overlaps with the orthographic projection of the protrusion on the substrate, and the orthographic projection of the hollow structure on the substrate 200 overlaps with the orthographic projection of the groove on the substrate. In the description of the present application, the meaning of "a plurality" is two or more.
[0040] For example, in Figure 5 and Figure 6 example, the first electrode layer 110 includes a plurality of electrode segments 111 arranged at intervals, and the second electrode layer 130 is an integral structure. Among them, the orthographic projection of the hollow structure between two adjacent electrode segments 111 on the substrate can coincide with the orthographic projection of the recess 121 on the substrate. That is, the area of the light-emitting unit layer 120 opposite to the hollow structure is the recess 121, and the area between two adjacent recesses 121 is the protrusion 122.
[0041] In this embodiment, by making the first electrode layer 110 include a plurality of electrode segments 111, and / or the second electrode layer 130 include a plurality of electrode segments 111, the hollow structure between two adjacent electrode segments 111 can cut off the current path of the recess 121, ensuring that the current can all flow through the protrusion 122 with a low turn-on voltage, making the luminous efficiency of the current higher and reducing the power consumption of the light-emitting device 100.
[0042] In one implementation, combined with Figure 5 , an insulating material 112 can be filled in the hollow structure between two adjacent electrode segments 111. Exemplarily, the insulating material 112 can be a light-absorbing material, such as organic dyes, semiconductor materials, metal materials, polymer materials, etc., but not limited thereto. The light-absorbing material can absorb the incident light from the outside, avoiding the reflection of the incident light at the recess 121 with a larger thickness, so as to make the black visual effect of the display panel 10 better.
[0043] Of course, the present application is not limited thereto. In another implementation, a part of the light-emitting unit layer 120 can be located in the hollow structure between two adjacent electrode segments 111 (not shown in the figure). At this time, the insulating material 112 may not be filled in the hollow structure between two adjacent electrode segments 111, which can simplify the manufacturing process of the light-emitting device 100 and improve the manufacturing efficiency of the light-emitting device 100. During the process of manufacturing the light-emitting unit layer 120, the recess 121 can be deposited in the hollow structure. Among them, the recess 121 can fill the hollow structure between two adjacent electrode segments 111, or can be filled in a partial area of the hollow structure.
[0044] In one implementation, as Figure 5 and Figure 6 shown, along the direction towards the substrate 200, the size of the groove gradually decreases, and the size of the protrusion gradually increases. With such a setting, the side wall of the area of the light-emitting unit layer 120 at the protrusion (i.e., the above-mentioned protrusion 122) can be an inclined surface, effectively changing the light-emitting direction of the light-emitting device 100, destroying the total reflection condition of the light-emitting device 100, reducing the total reflection effect in the light-emitting device 100, and thus improving the light output of the light-emitting device 100. In addition, the side wall of the protrusion 122 can be formed as an inclined surface thin layer. Since the protrusion 122 is located in the driving electric field between the first electrode layer 110 and the second electrode layer 130, and the recess 121 is located outside the driving electric field, the current can flow through the inclined surface thin layer with a low turn-on voltage, thereby effectively improving the luminous efficiency of the current.
[0045] In one implementation, referring to Figure 5 and Figure 6, the maximum distance between the side of the convex portion 122 facing away from the substrate 200 and the side of the concave portion 121 facing the substrate 200 is S1, and the distance between the symmetry axis of the convex portion 122 and the symmetry axis of the adjacent concave portion 121 is S2, where 0.4 ≤ S2 / S1 ≤ 0.6; wherein, the symmetry axes of both the convex portion 122 and the concave portion 121 are perpendicular to the substrate 200. Exemplarily, in Figure 5 In it, the solid line E1 is the symmetry axis of the convex portion 122, and the left and right halves of the convex portion 122 are symmetric about the solid line E1. The solid line E2 is the symmetry axis of the concave portion 121, and the left and right halves of the concave portion 121 are symmetric about the solid line E2.
[0046] In this embodiment, by making 0.4 ≤ S2 / S1 ≤ 0.6, the slope of the side wall of the convex portion 122 is reasonable, which can maximize the light output of the light-emitting device 100, thereby improving the display effect of the display panel 10.
[0047] In one embodiment, the shape of the first electrode layer 110 is adapted to the shape of the light-emitting unit layer 120; and / or, the shape of the second electrode layer 130 is adapted to the shape of the light-emitting unit layer 120. For example, in Figure 5 In the example of, the shape of the first electrode layer 110 is adapted to the shape of the light-emitting unit layer 120, and the shape of the second electrode layer 130 is adapted to the shape of the light-emitting unit layer 120. In this way, the manufacturing process of the light-emitting device 100 is simpler, thereby effectively improving the manufacturing efficiency of the light-emitting device 100.
[0048] In one embodiment, in combination with Figure 7 , along the arrangement direction of the grooves 410 and the protrusions 420, the size of the hollow structure 123 is L1, and the size of the side of the groove 410 away from the substrate 200 (i.e., the notch of the groove 410) is L2, where 0.4 ≤ L1 / L2 ≤ 0.6. In this way, the size of the hollow structure 123 is reasonable, ensuring that the hollow structure 123 can correspond to the thicker region of the light-emitting unit layer 120, making the part of the light-emitting unit layer 120 corresponding to the hollow structure 123 be the concave portion 121, and the convex portion 122 can be formed between the adjacent concave portions 121. Thus, the hollow structure can cut off the current path of the concave portion 121, ensuring that the current can all flow through the convex portion 122 with a lower turn-on voltage.
[0049] This application also provides a display device, including the display panel 10 in any of the above embodiments. Exemplarily, the display device can be any product or component with a display function such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc.
[0050] The display panel 10 of the above embodiments and other components of the display device may adopt various technical solutions known to those of ordinary skill in the art now and in the future, and will not be described in detail here.
[0051] The present application also provides a method for manufacturing a display panel. Figure 8 The flowchart showing the method for manufacturing a display panel according to an embodiment of the present application is as follows. Figure 8 As shown, the manufacturing method includes:
[0052] Step S801: Provide a substrate.
[0053] Step S802: Form a planarization layer on one side of the substrate; wherein, the side of the planarization layer away from the substrate includes periodically alternating grooves and protrusions.
[0054] Step S803: Form a light-emitting device layer on the side of the planarization layer away from the substrate; wherein, the light-emitting device layer includes a plurality of light-emitting devices, and each light-emitting device includes a first electrode layer, a pixel definition layer, a light-emitting unit layer, and a second electrode layer stacked in sequence. The pixel definition layer defines a plurality of pixel openings, and the pixel openings expose a partial area of the first electrode layer. The light-emitting unit layer covers the area of the first electrode layer exposed by the pixel openings. The maximum thickness of the light-emitting unit layer at the grooves is greater than the maximum thickness of the light-emitting unit layer at the protrusions; within the range of the pixel openings, the first electrode layer and / or the second electrode layer includes a hollow structure.
[0055] Exemplarily, the first electrode layer may be an anode layer, such as an ITO layer or an IGO layer; the second electrode layer may be a cathode layer, such as an Mg layer or an Ag layer. A driving electric field may be formed between the first electrode layer and the second electrode layer. During the driving of the display panel, holes are injected from the anode layer, electrons are injected from the cathode layer, and holes and electrons are combined within the light-emitting unit layer, thereby emitting light. In some embodiments, the light-emitting unit layer may sequentially include, in the direction from the first electrode layer to the second electrode layer: a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer. Of course, the light-emitting unit layer may also have other structures. For example, the light-emitting unit layer may include: a hole transport layer, a light-emitting layer, and an electron transport layer. The present application does not limit the structure of the light-emitting unit layer.
[0056] Exemplarily, the light-emitting unit layer may form a recess at the groove and a protrusion at the protrusion. The periodically alternating recesses and protrusions may be formed into a wavy concave-convex region to change the light-emitting direction of the light-emitting device, break the total reflection condition of the light-emitting device, reduce the total reflection effect in the light-emitting device, and thus increase the light-emitting amount of the light-emitting device. By making the first electrode layer and / or the second electrode layer include a hollow structure within the pixel opening range, the hollow structure can cut off the current path in the region of the light-emitting unit layer at the groove, so that the current can all flow through the region of the light-emitting unit layer at the protrusion. Since the maximum thickness of the light-emitting unit layer at the groove is greater than the maximum thickness of the light-emitting unit layer at the protrusion, the turn-on voltage of the light-emitting unit layer at the protrusion is lower than that at the groove. Therefore, the current can all flow through the region with a lower turn-on voltage, and the luminous efficiency of the current is higher, reducing the power consumption of the light-emitting device.
[0057] In the description of this specification, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.
[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.
[0059] In this application, unless otherwise clearly specified and defined, the terms "mount", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0060] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include contact between the first and second features not directly but through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and diagonally below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.
[0061] The above disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between various embodiments and / or settings discussed.
[0062] As described above, only the specific embodiments of this application are provided, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of various changes or substitutions, and these should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.
Claims
1. A display panel, characterized in that, Comprising: A substrate and a flat layer located on one side of the substrate, the side of the flat layer away from the substrate comprising periodically alternating grooves and protrusions; A light-emitting device layer, located on the side of the flat layer away from the substrate, comprising a plurality of light-emitting devices, the light-emitting devices comprising a first electrode layer, a pixel definition layer, a light-emitting unit layer, and a second electrode layer stacked, the pixel definition layer defining a plurality of pixel openings, the pixel openings exposing a partial region of the first electrode layer, the light-emitting unit layer covering the region of the first electrode layer exposed by the pixel openings, the maximum thickness of the light-emitting unit layer at the grooves being greater than the maximum thickness of the light-emitting unit layer at the protrusions; Within the pixel openings, the first electrode layer and / or the second electrode layer comprises a hollowed-out structure.
2. The display panel according to claim 1, wherein The first electrode layer comprises a plurality of electrode segments, and / or the second electrode layer comprises a plurality of electrode segments; wherein, a hollowed-out structure is formed between two adjacent electrode segments; the orthographic projection of the electrode segments on the substrate overlaps with the orthographic projection of the protrusions on the substrate, and the orthographic projection of the hollowed-out structure on the substrate overlaps with the orthographic projection of the grooves on the substrate.
3. The display panel according to claim 1, wherein The hollowed-out structure is filled with an insulating material.
4. The display panel according to claim 1, wherein A part of the light-emitting unit layer is located within the hollowed-out structure.
5. The display panel according to claim 1, wherein Along the direction towards the substrate, the size of the grooves gradually decreases, and the size of the protrusions gradually increases.
6. The display panel according to claim 5, wherein The light-emitting unit layer forms a concave portion at the grooves and a convex portion at the protrusions, the maximum distance between the side of the convex portion facing away from the substrate and the side of the concave portion facing the substrate being S1, the distance between the symmetry axis of the convex portion and the symmetry axis of an adjacent concave portion being S2, 0.4 ≤ S2 / S1 ≤ 0.6; wherein, the symmetry axis of the convex portion and the symmetry axis of the concave portion are both perpendicular to the substrate.
7. The display panel according to any one of claims 1-6, characterized in that, The shape of the first electrode layer is adapted to the shape of the light-emitting unit layer; and / or, the shape of the second electrode layer is adapted to the shape of the light-emitting unit layer.
8. The display panel according to any one of claims 1-6, characterized in that, Along the arrangement direction of the grooves and the protrusions, the size of the hollowed-out structure is L1, and the size of the side of the grooves away from the substrate is L2, wherein, 0.4 ≤ L1 / L2 ≤ 0.
6.
9. A display device, characterized in that, Comprising a display panel according to any one of claims 1-8.
10. A method for preparing a display panel, characterized in that, Comprising: Providing a substrate; Forming a flat layer on one side of the substrate; wherein, the side of the flat layer away from the substrate comprises periodically alternating grooves and protrusions; A light-emitting device layer is formed on a side of the flat layer away from the substrate; wherein, the light-emitting device layer includes a plurality of light-emitting devices, and each light-emitting device includes a first electrode layer, a pixel definition layer, a light-emitting unit layer, and a second electrode layer which are stacked. The pixel definition layer defines a plurality of pixel openings, and the pixel openings expose partial regions of the first electrode layer. The light-emitting unit layer covers the regions of the first electrode layer exposed by the pixel openings, and a maximum thickness of the light-emitting unit layer at the groove is greater than a maximum thickness of the light-emitting unit layer at the protrusion; within the range of the pixel openings, the first electrode layer and / or the second electrode layer includes a hollowed-out structure.