Display panel and display device

Abstract

The embodiment of the utility model provides a display panel and a display device.The display panel comprises a substrate and a flat layer, and the side, away from the substrate, of the flat layer comprises grooves and protrusions which are periodically and alternately arranged; the light-emitting device layer is located on the side, away from the substrate, of the flat layer and comprises a plurality of light-emitting devices, each light-emitting device comprises a first electrode layer, a pixel defining layer, a light-emitting unit layer and a second electrode layer which are arranged in a stacked mode, the pixel defining layer defines a plurality of pixel openings, and the pixel openings expose part of the first electrode layer; the light-emitting unit layer covers the area, exposed by the pixel opening, of the first electrode layer, and the maximum thickness of the light-emitting unit layer at the groove is larger than the maximum thickness of the light-emitting unit layer at the protrusion; within the pixel opening range, the first electrode layer and / or the second electrode layer comprise / comprises a hollow structure. According to the technical scheme, the light extraction efficiency of the light-emitting device is improved, the light-emitting efficiency is improved, and the power consumption of the light-emitting device is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. 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 reaction rate, can be used for flexible panels, wide operating temperature range, full color, simple structure and process, etc., and is becoming more and more popular among users. However, there is a huge difference between the external quantum efficiency and internal quantum efficiency of OLED devices, which makes the light extraction efficiency of OLED devices only about 20%. Therefore, how to improve the light extraction efficiency of OLED devices has become an urgent problem to be solved. Utility Model Content

[0003] Embodiments of the present application provide a display panel and a display device to solve or alleviate one or more technical problems in the prior art.

[0004] As one aspect of an embodiment of the present application, an embodiment of the present application provides a display panel, 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 arranged in a stacked manner, the pixel definition layer defining a plurality of pixel openings, the pixel openings exposing partial areas of the first electrode layer, the light-emitting unit layer covering areas 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 range of the pixel openings, the first electrode layer and / or the second electrode layer comprises 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 insulating material.

[0007] In one embodiment, a portion of the light-emitting unit layer is located in the hollow structure.

[0008] In one embodiment, along the direction toward the substrate, the size of the grooves gradually decreases, and the size of the protrusions gradually increases.

[0009] In one embodiment, the light-emitting unit layer forms a concave portion at the groove, and the light-emitting unit layer forms a convex portion at the convex portion, 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 is S1, and the distance between the symmetry axis of the convex portion and the symmetry axis of the adjacent concave portion is 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.

[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 the protrusions, the size of the hollow structure is L1, and the size of the side of the groove away from the substrate is L2, wherein 0.4≤L1 / L2≤0.6.

[0012] As another aspect of an embodiment of the present application, an embodiment of the present application provides a display device, comprising a display panel of any of the above-mentioned embodiments.

[0013] The embodiment of the present application adopts the above technical solution to improve the light extraction efficiency of the light-emitting device, while improving the luminous efficiency and reducing the power consumption of the light-emitting device.

[0014] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0016] Figure 1 A schematic diagram showing the light output loss of a light emitting device;

[0017] Figure 2 A schematic structural diagram of a light emitting device according to an embodiment of the present application is shown;

[0018] Figure 3 Show Figure 2 A top view of the light emitting device shown in ;

[0019] Figure 4 Show Figure 2 A schematic diagram of light emission of the light emitting device shown in ;

[0020] Figure 5 A partial structural schematic diagram of a light emitting device according to another embodiment of the present application is shown;

[0021] Figure 6 A schematic diagram showing the structure of a display panel according to an embodiment of the present application is shown;

[0022] Figure 7 A schematic diagram showing a process of preparing a display panel according to an embodiment of the present application is shown;

[0023] Figure 8 A flow chart of a method for manufacturing a display panel according to an embodiment of the present application is shown.

[0024] Description of reference numerals:

[0025] 10: display panel; 100: light-emitting device; 110: first electrode layer; 111: electrode segment; 112: light-absorbing material; 120: light-emitting unit layer; 121: concave portion; 122: convex portion; 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 electrode; 542: second electrode; 600: encapsulation layer; 700: conductive film layer. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0027] In the related art, the main modes of light loss in light-emitting devices such as OLED devices include metal surface plasma mode, waveguide mode and substrate mode. Figure 1A schematic diagram showing the light output loss of a light-emitting device is shown. Among them, A is a metal surface plasma mode; B is a waveguide mode; C is a substrate mode; and D is light emitted to 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 which are stacked in sequence. In the metal surface plasma mode A, the light is horizontally conducted along the surface of the first electrode layer 11 or the second electrode layer 12 and cannot be emitted to the external space. In the substrate mode C, the light is refracted at the substrate 10 and also cannot be emitted to 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 another part is totally reflected 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 to 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.

[0028] Figure 2 A schematic structural diagram of a light emitting device according to an embodiment of the present application is shown; Figure 3 Show Figure 2 A top view of the light emitting device shown in FIG. 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 which are stacked. The light emitting unit layer 120 is formed into a wavy concave-convex region, and the concave-convex region includes a concave portion 121 and a convex portion 122. The top view of the concave-convex region is a hexagonal honeycomb structure. The concave-convex region can change the light emission 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 increase the light emission of the light emitting device 100.

[0029] However, since the thickness of the concave portion 121 of the concave-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 region of the light-emitting device 100 . Figure 4 Show Figure 2 FIG. 1 is a schematic diagram of a light emitting device 100 shown in FIG. Figure 4As shown, the convex portion 122 is the main light-emitting area. In the case of low voltage, the concave portion 121 does not emit light due to the high start-up voltage, resulting in a small light-emitting area, and the excessive current density in the light-emitting area will accelerate the aging of the light-emitting device 100. In addition, in the case of low voltage, the concave portion 121 does not emit light but current will flow through, and this part of the current is an invalid current. The existence of invalid current will cause the overall current efficiency of the display panel 10 to be low, and greater power consumption is required when the same brightness is achieved. In addition, in the case of high voltage, the concave portion 121 will emit light, but due to the different wavelengths of light from the concave portion 121 and the convex portion 122, the ratio of blue light in the emitted white light is low, and the color temperature is low. In order to meet the use requirements of high color temperature, it is necessary to complement the blue pixel. Since the luminous efficiency of the blue pixel is low, the power consumption of the display panel 10 will be increased. In addition, since the thickness of the concave portion 121 is greater than the thickness of the convex portion 122, when external light is incident, reflection will occur at the concave portion 121, resulting in a poor black visual effect of the display panel 10.

[0030] Figure 5 A partial structural schematic diagram of a light emitting device 100 according to another embodiment of the present application is shown; Figure 6 FIG. 2 is a schematic diagram showing the structure of a display panel according to an embodiment of the present application. Figure 5-Figure 6 As shown, the display panel 10 includes a substrate 200, a planar layer 400, and a light emitting device layer.

[0031] Specifically, the side of the flat layer 400 away from the substrate 200 includes grooves and protrusions arranged alternately in a periodic manner. The light-emitting device layer is located on the side of the flat 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, "plurality" means two or more.

[0032] 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 portion 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 groove is greater than the maximum thickness of the light emitting unit layer 120 at the protrusion. Within the pixel openings 310, the first electrode layer 110 and / or the second electrode layer 130 include a hollow structure.

[0033] For example, in combination 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. In 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. 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. 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. An encapsulation layer 600 may be provided on the side of the second electrode layer 130 away from the substrate 200.

[0034] Figure 7 A schematic diagram of the preparation process of the display panel 10 according to an embodiment of the present application is shown. By way of example, when preparing the display panel 10, a plurality of grooves 410 can first be formed on the flat layer 400 within the pixel by an exposure or etching process, and a protrusion is formed between two adjacent grooves 410. Then a conductive film layer 700 is formed on the flat layer 400, and the conductive film layer 700 is wavy. Then, a portion of the area corresponding to the conductive film layer 700 and the groove 410 is removed by an etching process to form a hollow structure. Thereafter, the light-emitting unit layer 120 and the second electrode layer 130 are sequentially evaporated so that the light-emitting unit layer 120 and the second electrode layer 130 are both wavy. Finally, an encapsulation layer 600 is formed on the side of the second electrode layer 130 that is away from the substrate 200.

[0035] 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 a 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. In 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 include: 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) in sequence along the direction from the first electrode layer 110 to the second electrode layer 130. Of course, the light-emitting unit layer 120 may also be 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.

[0036] In some embodiments, the light-emitting unit layer 120 forms a concave portion 121 at the groove, and the light-emitting unit layer 120 forms a convex portion 122 at the convex portion. That is, the orthographic projection of the groove on the substrate 200 overlaps with the orthographic projection of the concave portion 121 on the substrate 200; the orthographic projection of the convex portion on the substrate 200 overlaps with the orthographic projection of the convex portion 122 on the substrate 200. The periodically alternating concave portions 121 and convex portions 122 can be formed into a wavy concave-convex area to change the light emitting direction of the light-emitting device 100, destroy the total reflection condition of the light-emitting device 100, and 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.

[0037] 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 range of the pixel opening 310, the hollow structure can cut off the current path of the light-emitting unit layer 120 in the groove area, so that the current can flow through the light-emitting unit layer 120 in the protrusion area. Since the maximum thickness of the light-emitting unit layer 120 in the groove is greater than the maximum thickness of the light-emitting unit layer 120 in the protrusion, the turn-on voltage of the light-emitting unit layer 120 in the protrusion is lower than the turn-on voltage in the groove, so the current can flow through the area with low turn-on voltage, the luminous efficiency of the current is higher, and the power consumption of the light-emitting device 100 is reduced. At the same time, the color point of the light emitted by the light-emitting unit layer 120 in the protrusion area is more stable, and the color temperature of the emitted light can be made better by adjusting the thickness of the light-emitting unit layer 120, and the power consumption of the light-emitting device 100 is further reduced under the premise of meeting the needs of users.

[0038] In one embodiment, 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. 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 this application, "plurality" means two or more.

[0039] For example, in Figure 5 and Figure 6 In the example of , 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. The orthographic projection of the hollow structure between two adjacent electrode segments 111 on the substrate may coincide with the orthographic projection of the concave portion 121 on the substrate. In other words, the area in the light-emitting unit layer 120 that is arranged opposite to the hollow structure is the concave portion 121, and the area between two adjacent concave portions 121 is the convex portion 122.

[0040] In this embodiment, by making the first electrode layer 110 include multiple electrode segments 111, and / or the second electrode layer 130 include multiple 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, thereby making the luminous efficiency of the current higher and reducing the power consumption of the light-emitting device 100.

[0041] In one embodiment, in combination Figure 5 , the hollow structure between two adjacent electrode segments 111 may be filled with an insulating material 112. Exemplarily, the insulating material 112 may be a light-absorbing material, such as an organic dye, a semiconductor material, a metal material, a polymer material, etc., but not limited thereto. The light-absorbing material may absorb incident light from the outside, and prevent the incident light from being reflected at the concave portion 121 with a larger thickness, thereby making the black visual effect of the display panel 10 better.

[0042] Of course, the present application is not limited thereto. In another embodiment, a portion of the light-emitting unit layer 120 may be located in a hollow structure between two adjacent electrode segments 111 (not shown). In this case, the hollow structure between two adjacent electrode segments 111 may not be filled with the insulating material 112, which may simplify the preparation process of the light-emitting device 100 and improve the preparation efficiency of the light-emitting device 100. In the process of preparing the light-emitting unit layer 120, the recess 121 may be deposited in the hollow structure. Among them, the recess 121 may fill the hollow structure between two adjacent electrode segments 111, or may fill part of the hollow structure.

[0043] In one embodiment, Figure 5 and Figure 6 As shown, along the direction toward the substrate 200, the size of the groove gradually decreases, and the size of the protrusion gradually increases. With such a configuration, the side wall of the light-emitting unit layer 120 in the protrusion area (i.e., the above-mentioned protrusion 122) can be an inclined surface, which effectively changes the light emission direction of the light-emitting device 100, destroys the total reflection condition of the light-emitting device 100, and reduces the total reflection effect in the light-emitting device 100, thereby increasing the light emission of the light-emitting device 100. In addition, the side wall of the protrusion 122 can be formed as an inclined 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 concave portion 121 is located outside the driving electric field, the current can flow through the inclined thin layer with a low turn-on voltage, thereby effectively improving the luminous efficiency of the current.

[0044] In one embodiment, reference 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, the distance between the symmetry axis of the convex portion 122 and the symmetry axis of the adjacent concave portion 121 is S2, 0.4≤S2 / S1≤0.6; wherein the symmetry axis of the convex portion 122 and the symmetry axis of the concave portion 121 are both perpendicular to the substrate 200. For example, Figure 5 In FIG. 1 , 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.

[0045] In the present 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 and thus improve the display effect of the display panel 10 .

[0046] 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. Figure 5 In the example, 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 preparation process of the light-emitting device 100 is simpler, thereby effectively improving the preparation efficiency of the light-emitting device 100.

[0047] In one embodiment, in combination 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, wherein 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 area of ​​the light-emitting unit layer 120, so that the part of the light-emitting unit layer 120 corresponding to the hollow structure 123 is a concave portion 121, and a convex portion 122 can be formed between adjacent concave portions 121, so that 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 low turn-on voltage.

[0048] The present application also provides a display device, including the display panel 10 of 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 notebook computer, a digital photo frame, a navigator, etc.

[0049] The other components of the display panel 10 and the display device in the above embodiment may adopt various technical solutions known to ordinary technicians in the field now and in the future, and will not be described in detail here.

[0050] The present application also provides a method for preparing a display panel. Figure 8 FIG. 1 is a flow chart showing a method for manufacturing a display panel according to an embodiment of the present application. Figure 8 As shown, the preparation method comprises:

[0051] Step S801: providing a substrate.

[0052] Step S802: forming a flat layer on one side of the substrate; wherein the side of the flat layer away from the substrate comprises grooves and protrusions that are periodically and alternately arranged.

[0053] Step S803: forming a light-emitting device layer on a side of the flat layer away from the substrate; wherein the light-emitting device layer comprises a plurality of light-emitting devices, and the light-emitting devices comprise 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, 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 comprises a hollow structure.

[0054] 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 a Mg layer or an Ag layer. A driving electric field may be formed between the first electrode layer and the second electrode layer. In 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, thereby emitting light. In some embodiments, the light-emitting unit layer may include: a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer in sequence along the direction from the first electrode layer to the second electrode layer. Of course, the light-emitting unit layer may also be other structures, for example: the light-emitting unit layer may include: a hole transport layer, a light-emitting layer, an electron transport layer, and the present application does not limit the structure of the light-emitting unit layer.

[0055] Exemplarily, the light-emitting unit layer may form a concave portion at the groove, and the light-emitting unit layer may form a convex portion at the protrusion. The periodically alternating concave portions and convex portions may be formed into a wavy concave-convex area to change the light-emitting direction of the light-emitting device, destroy the total reflection condition of the light-emitting device, reduce the total reflection effect in the light-emitting device, and thus increase the light output 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 of the light-emitting unit layer in the groove area, so that the current can flow entirely through the light-emitting unit layer in the protrusion area. Since the maximum thickness of the light-emitting unit layer in the groove is greater than the maximum thickness of the light-emitting unit layer in the protrusion, the turn-on voltage of the light-emitting unit layer in the protrusion is lower than the turn-on voltage in the groove, so that the current can flow entirely through the area with low turn-on voltage, and the light-emitting efficiency of the current is higher, thereby reducing the power consumption of the light-emitting device.

[0056] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0058] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0060] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0061] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: A substrate and a flat layer located on one side of the substrate, wherein a side of the flat layer away from the substrate comprises grooves and protrusions arranged alternately and periodically; a light-emitting device layer, located on a side of the flat layer away from the substrate, comprising a plurality of light-emitting devices, wherein the light-emitting devices include a first electrode layer, a pixel definition layer, a light-emitting unit layer, and a second electrode layer which are stacked, wherein the pixel definition layer defines a plurality of pixel openings, wherein the pixel openings expose a portion of the first electrode layer, the light-emitting unit layer covers the area of ​​the first electrode layer exposed by the pixel openings, and wherein 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 pixel opening range, the first electrode layer and / or the second electrode layer includes a hollow structure.

2. The display panel according to claim 1, characterized in that: 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.

3. The display panel according to claim 1, characterized in that: The hollow structure is filled with insulating material.

4. The display panel according to claim 1, characterized in that: A portion of the light emitting unit layer is located in the hollow structure.

5. The display panel according to claim 1, characterized in that: Along the direction toward the substrate, the size of the groove gradually decreases, and the size of the protrusion gradually increases.

6. The display panel according to claim 5, characterized in that: The light-emitting unit layer forms a concave portion at the groove, and the light-emitting unit layer forms a convex portion at the convex portion, 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 is S1, the distance between the symmetry axis of the convex portion and the symmetry axis of the adjacent concave portion is 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 to 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 to 6, characterized in that: Along the arrangement direction of the grooves and the protrusions, the size of the hollow structure is L1, and the size of the groove on a side away from the substrate is L2, wherein 0.4≤L1 / L2≤0.

6.

9. A display device, characterized in that: The invention comprises a display panel according to any one of claims 1 to 8.

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