CN113488571B - Display panel and display device - Google Patents
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- CN113488571B CN113488571B CN202110736747.3A CN202110736747A CN113488571B CN 113488571 B CN113488571 B CN 113488571B CN 202110736747 A CN202110736747 A CN 202110736747A CN 113488571 B CN113488571 B CN 113488571B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/483—Containers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises: a substrate; the three-dimensional groove-shaped structure is arranged on the substrate; the three-dimensional groove-shaped structure comprises a positioning inclined plane; the positioning bevel comprises a lower edge close to the substrate and an upper edge far away from the substrate; the light-emitting element is arranged in the three-dimensional groove-shaped structure and is placed along the positioning inclined plane; the light-emitting element includes a first end and a second end in a length direction; the radial width of the first end is greater than the radial width of the second end; the radial width is the width in the direction perpendicular to the length direction; the distance between the center of gravity of the light emitting element and the second end is greater than the distance between the center of gravity of the light emitting element and the first end; the first end of the light-emitting element is close to the lower edge of the positioning inclined plane; the second end of the light emitting element is near the upper edge of the locating bevel. The technical scheme provided by the invention can improve the contact precision of the nano LED and the driving electrode.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
Light-Emitting diodes (LEDs) have high Light conversion efficiency, very low energy consumption, and are semi-permanent and environmentally friendly. Accordingly, LEDs are used in many fields such as traffic lights, mobile phones, car headlights, outdoor electronic billboards, backlights, and indoor/outdoor lights.
Recently, a display device using a nano-sized LED as a light emitting element has been studied.
Meanwhile, in order for the nano LED to normally emit light, the nano LED and the driving electrode should be properly contacted with each other. When the nano LED is not precisely aligned, the nano LED and the driving electrode may not contact each other, and thus, the nano LED may not emit light.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for improving the contact precision of a nano LED and a driving electrode.
In a first aspect, an embodiment of the present invention provides a display panel, including: a substrate;
the three-dimensional groove-shaped structure is arranged on the substrate; the three-dimensional groove-shaped structure comprises a positioning inclined plane; the positioning bevel comprises a lower edge close to the substrate and an upper edge far away from the substrate;
the light-emitting element is arranged in the three-dimensional groove-shaped structure and is placed along the positioning inclined plane; the light emitting element includes a first end and a second end in a length direction; the radial width of the first end is greater than the radial width of the second end; the radial width is a width in a direction perpendicular to the length direction; a distance between the center of gravity of the light emitting element and the second end is greater than a distance between the center of gravity of the light emitting element and the first end;
The first end of the light-emitting element is close to the lower edge of the positioning inclined plane; the second end of the light emitting element is close to the upper edge of the positioning inclined plane.
In a second aspect, an embodiment of the present invention further provides a display apparatus, including a display panel provided by any embodiment of the present invention.
In the invention, a three-dimensional groove-shaped structure is formed on the substrate so as to realize the positioning of the light-emitting element. Specifically, the three-dimensional groove-shaped structure comprises a positioning inclined plane, the positioning inclined plane is an inclined plane with an included angle with a plane where the substrate is located, the three-dimensional groove-shaped structure comprises an upper edge and a lower edge which are oppositely arranged, the light-emitting element is placed along the positioning inclined plane, the light-emitting element comprises a first end and a second end along the length direction, the radial width of the first end is larger than that of the second end, the gravity center of the light-emitting element is enabled to be closer to the first end, then the light-emitting element is close to the lower edge of the positioning inclined plane under the action of the gravity center and the positioning inclined plane, and the second end is close to the upper edge of the positioning inclined plane, so that the quick positioning of the light-emitting element on the positioning inclined plane is completed. In this embodiment, the first end and the second end of the light emitting element adopt the design of the big and small heads, the light emitting element realizes that the first end is close to the lower edge under the action of gravity center offset, so that the accurate positioning of the light emitting element is realized, and the light emitting element is obliquely arranged on the positioning inclined plane instead of being transversely arranged on the substrate, thereby being beneficial to reducing the transverse space occupation of the light emitting element, further being capable of arranging the light emitting element with higher density on the substrate, and improving the resolution and the display effect of the display panel.
Drawings
FIG. 1 is a schematic diagram of a nano LED structure according to the prior art;
fig. 2 is a schematic structural diagram of a three-dimensional groove structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a partial cross-sectional structure of a display panel according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure of a nano LED according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a partial cross-sectional structure of a display panel according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of another nano-LED according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 8 is a schematic top view of a display panel according to an embodiment of the invention;
FIG. 9 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention;
FIG. 10 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention;
FIG. 11 is a schematic view of another three-dimensional channel structure according to an embodiment of the present invention;
FIG. 12 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention;
FIG. 13 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention;
FIG. 14 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention;
FIG. 15 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 16 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 17 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 18 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention;
FIG. 19 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention;
fig. 20 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In general, the nano-sized LEDs may be configured as a stereoscopic pattern such as a strip shape, a cylinder, etc., as shown in fig. 1, fig. 1 is a schematic structural diagram of a nano-LED provided in the prior art, and fig. 1 shows a cylindrical nano-LED 11', where in a display panel, the pixel size can be reduced to a greater extent, the resolution can be increased, and the display effect of the display panel can be improved by applying the nano-LED 11'. When transferring each nano LED to a pixel area to form a pixel, the nano LED is placed on a substrate by adopting a coating and ink-jet printing mode, but in the process of realizing the embodiment of the invention, the inventor finds that the nano LED is difficult to be orderly arranged due to the limitation of the shape, so that the nano LED and a driving electrode are difficult to contact each other.
Specifically, an embodiment of the present invention provides a display panel, including: a substrate;
the three-dimensional groove-shaped structure is arranged on the substrate; the three-dimensional groove-shaped structure comprises a positioning inclined plane; the positioning bevel comprises a lower edge close to the substrate and an upper edge far away from the substrate;
the light-emitting element is arranged in the three-dimensional groove-shaped structure and is placed along the positioning inclined plane; the light-emitting element includes a first end and a second end in a length direction; the radial width of the first end is greater than the radial width of the second end; the radial width is the width in the direction perpendicular to the length direction; the distance between the center of gravity of the light emitting element and the second end is greater than the distance between the center of gravity of the light emitting element and the first end;
the first end of the light-emitting element is close to the lower edge of the positioning inclined plane; the second end of the light emitting element is near the upper edge of the locating bevel.
In the embodiment of the invention, a three-dimensional groove-shaped structure is formed on the substrate so as to realize the positioning of the light-emitting element. Specifically, the three-dimensional groove-shaped structure comprises a positioning inclined plane, the positioning inclined plane is an inclined plane with an included angle on the plane where the substrate is located, the three-dimensional groove-shaped structure comprises an upper edge and a lower edge which are oppositely arranged, the light-emitting element is placed along the positioning inclined plane, the light-emitting element comprises a first end and a second end along the length direction, the radial width of the first end is larger than that of the second end, the gravity center of the light-emitting element is enabled to be closer to the first end, the light-emitting element is enabled to be close to the lower edge of the positioning inclined plane under the action of the gravity center and the positioning inclined plane, the second end is close to the upper edge of the positioning inclined plane, and therefore rapid positioning of the light-emitting element on the positioning inclined plane is completed. In this embodiment, the first end and the second end of the light emitting element adopt the design of the big and small heads, the light emitting element realizes that the first end is close to the lower edge under the action of gravity center offset, so that the accurate positioning of the light emitting element is realized, and the light emitting element is obliquely arranged on the positioning inclined plane instead of being transversely arranged on the substrate, thereby being beneficial to reducing the transverse space occupation of the light emitting element, further being capable of arranging the light emitting element with higher density on the substrate, and improving the resolution and the display effect of the display panel.
The foregoing is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.
Fig. 2 is a schematic structural view of a three-dimensional groove structure provided in an embodiment of the present invention, and fig. 3 is a schematic structural view of a partial cross-section of a display panel provided in an embodiment of the present invention, as shown in fig. 2, the display panel includes a substrate 12, and a three-dimensional groove structure 13 disposed on the substrate 12, the three-dimensional groove structure 13 includes a positioning inclined surface 131, the positioning inclined surface 131 includes a lower edge L1 and an upper edge L2 disposed opposite to each other, in this embodiment, the lower edge L1 of the positioning inclined surface 131 refers to an edge relatively close to the substrate 11, and the upper edge L2 refers to an edge relatively far away from the substrate 11. The inclined angle α is formed between the positioning inclined surface 132 and the substrate 12, and the three-dimensional groove-shaped structure 13 in this embodiment may be bowl-shaped or arc-shaped, as shown in fig. 2, and fig. 2 shows the three-dimensional groove-shaped structure 13 with arc shape. In this embodiment, the three-dimensional groove-shaped structure 13 may be formed by at least one insulating layer, in one example, one insulating layer may be formed on the substrate 12 and etched to obtain the three-dimensional groove-shaped structure 13, in another example, multiple insulating layers may be formed on the substrate 12 and at least one insulating layer may be etched to obtain the three-dimensional groove-shaped structure 13, and the specific process of the three-dimensional groove-shaped structure 13 is not particularly limited in this embodiment.
The display panel further includes light emitting elements 11, and the light emitting elements 11 are disposed in the three-dimensional groove-shaped structure 13, and because the plurality of light emitting elements 11 are spray printed onto the substrate following the solution, for disordered arrangement, the three-dimensional groove-shaped structure 13 is disposed in this embodiment, and a placement position can be provided for the light emitting elements 11 through the inclined positioning inclined plane 131. The light emitting element 11 may be placed along the positioning slope 131 from the upper edge L2 toward the lower edge L1, that is, the length direction of the light emitting element 11 from the upper edge L2 toward the lower edge L1. In this embodiment, the inclined plane is provided, so that the light-emitting element 11 is obliquely placed along the inclined plane under the action of the inclined plane, which is favorable for reducing the space occupied by the light-emitting element 11 transversely on the plane of the substrate 12, is favorable for improving the resolution of the display panel, and enhances the light-emitting efficiency of the whole display panel. Fig. 4 is a schematic cross-sectional view of a nano LED according to an embodiment of the present invention, and it should be noted that, in the present embodiment, the light emitting element 11 may include a first end 111 and a second end 112 along a length direction X; the radial width R1 of the first end 111 of the light emitting element 11 is greater than the radial width R2 of the second end 112 of the light emitting element 11; the radial width is the width in the direction perpendicular to the length direction X; the distance d1 between the center of gravity O of the light emitting element 11 and the second end 112 is larger than the distance d2 between the center of gravity O of the light emitting element 11 and the first end 111. In this embodiment, the nano LED may be configured to have a large head and a small head, where the light emitting element 11 may include a first end 111 and a second end 112 along the length direction X, the first end 111 is configured to be a large head, the second end 112 is configured to be a small head, the radial width R1 of the first end 111 is greater than the radial width R2 of the second end 112, and the radial width in this embodiment is configured to be a width of the light emitting element 11 perpendicular to the length direction X, so that the center of gravity O of the light emitting element 11 is closer to the first end 111, the first end 111 of the light emitting element 11 is easily located close to the lower edge L1 of the locating inclined plane 131 under the action of gravity, so that the first end 112 of the light emitting element 11 is close to the upper edge L2 of the locating inclined plane 131.
Referring to fig. 2 and 3, the display panel may further include: a first positioning electrode 141 and a second positioning electrode 142 disposed on the substrate 11; the second positioning electrode 142 is arranged in an insulating manner with the first positioning electrode 141 and is used for positioning the light-emitting element 11; the first positioning electrode 141 is disposed near the lower edge L1 of the positioning slope 131; the second positioning electrode 142 is disposed near the upper edge L2 of the positioning slope 131.
When the positioning inclined surface 131 is used for positioning the light-emitting element 11 through the inclined surface, the first positioning electrode 141 and the second positioning electrode 142 are further arranged, the light-emitting element is aligned and positioned through an electric field, an electric field in a certain direction is formed between the first positioning electrode 141 and the second positioning electrode 142, the electric field can control the direction and the position of the light-emitting element 11, positioning is further achieved, in the embodiment, the first positioning electrode 141 is arranged near the lower edge L1 of the positioning inclined surface 131, the second positioning electrode 142 is arranged near the upper edge L2 of the positioning inclined surface 131, an electric field pointing to the upper edge L2 from the lower edge L1 of the positioning inclined surface 131 is formed, the length direction of the light-emitting element 11 is further guaranteed to be pointing to the upper edge L2 from the lower edge L1, the light-emitting element 11 is guaranteed to lean on the positioning inclined surface 131 firmly, and the light-emitting element 11 is prevented from falling off from the positioning inclined surface 131. In this embodiment, by setting the first positioning electrode 141 and the second positioning electrode 142 in cooperation with the positioning inclined plane 131, a stronger anchoring force can be provided for positioning the light emitting element 11, so that the deviation of the position of the display panel in the production and transportation process is avoided, and the positioning accuracy and stability of the light emitting element 11 are improved.
It should be noted that the first positioning electrode 141 and the second positioning electrode 142 may be disposed on a side of the three-dimensional groove-like structure 13 away from the substrate 12; alternatively, the first positioning electrode 141 and the second positioning electrode 142 may be disposed at a side of the three-dimensional groove-like structure 13 near the substrate 12; alternatively, as shown in fig. 3, the first and second positioning electrodes 141 and 142 may also be embedded in an insulating layer forming the solid groove-like structure 13, for example, the solid groove-like structure 13 may be formed of a plurality of insulating layers in which the first and second positioning electrodes 141 and 142 are formed in two adjacent layers. The film layers of the first positioning electrode 141 and the second positioning electrode 142 are not limited in this embodiment. The first positioning electrode 141 and the second positioning electrode 142 may be formed in the same layer, or may be provided in different layers, and this embodiment is not particularly limited.
With continued reference to fig. 2 and 3, the display panel may optionally further include: the first driving electrode 151 and the second driving electrode 152 are disposed on one side of the three-dimensional groove-shaped structure 13 away from the substrate 11; the first driving electrode 151 is connected to the first end 111 of the light emitting element 11; the second driving electrode 152 is connected to the second end 112 of the light emitting element 11.
After the light emitting element 11 is positioned, the first driving electrode 151 and the second driving electrode 152 need to be provided so that the driving electrodes can drive the light emitting element 11. In this embodiment, the light emitting element 11 includes a first end 111 and a second end 112, and the first end 111 of the light emitting element 11 is electrically connected to the first driving electrode 151, and the second end 112 of the light emitting element 11 is electrically connected to the second driving electrode 152, so that the light emitting element 11 emits light under the driving of the driving electrode.
With continued reference to fig. 4, in a specific example, the light emitting element 11 may include a first end 111, a first semiconductor layer 113, an active layer 115, a second semiconductor layer 114, and a second end 112 disposed in this order in a length direction, and in this embodiment, the first end 111 and the second end 112 may include conductive metals, for example, one or more metal materials that may include aluminum, titanium, indium, gold, and silver. In another embodiment, the first end 111 and the second end 112 may further include Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), which is not limited in this embodiment, but the conductive properties of the first end 111 and the second end 112 need to be ensured. The active layer 115 may have a single quantum well or multiple quantum well structure. Materials such as AlGaN and AlInGaN may be used as active layer 115. When an electric field is applied to the active layer 115, the active layer 115 generates light through coupling of electron-hole pairs. The position of the active layer 115 may be variously changed according to the type of nano LED.
In this embodiment, the first driving electrode 151 may be disposed in the three-dimensional groove-shaped structure 13 and close to the lower edge of the positioning inclined plane 131, the second driving electrode 152 may be disposed outside the three-dimensional groove-shaped structure 13 and close to the upper edge of the positioning inclined plane 131, and the first end 111 of the light-emitting element 11 is positioned close to the lower edge of the positioning inclined plane 131, so that the first end 111 is close to the first driving electrode 151, the second end 112 of the light-emitting element 11 is positioned close to the upper edge of the positioning inclined plane 131, so that the second end 112 is close to the second driving electrode 152, and the inclined arrangement of the light-emitting element 11 is realized, the setting area of the driving electrode is reduced while the transverse occupation is reduced, and the connection effect between the light-emitting element 11 and the driving electrode is improved. Alternatively, the first driving electrode 151 and the second driving electrode 152 may be disposed in the same layer.
Fig. 5 is a schematic view of a partial cross-sectional structure of a display panel according to an embodiment of the present invention, and optionally, a first positioning electrode 141 may be multiplexed into a first driving electrode 151, and connected to a first end 111 of a light emitting element 11; the second positioning electrode 142 may be multiplexed as a second driving electrode 152, and connected to the second end 112 of the light emitting element 11.
In this embodiment, the first positioning electrode 141 and the second positioning electrode 142 may be formed after the light emitting element 11 is jet printed, and the positioning electrodes may be multiplexed as driving electrodes in a subsequent process, specifically, the first positioning electrode may be multiplexed as the first driving electrode 151 and the second positioning electrode 142 may be multiplexed as the second driving electrode 152. In the positioning process of the light emitting element 11, fixed or varying alternating currents are respectively input to the first positioning electrode 141 and the second positioning electrode 142 so that a positioning electric field is formed between the first positioning electrode 141 and the second positioning electrode 142, so that the light emitting element 11 can be positioned in the electric field direction. After positioning, a driving voltage signal may be input to the first positioning electrode 141 and the second positioning electrode 142, respectively, to thereby drive the light emitting element 11 to emit light for display. In the embodiment, the positioning electrode is multiplexed into the driving electrode, a signal is input to the positioning electrode in the positioning stage to generate an electric field, and a driving signal is input to the positioning electrode in the driving stage, so that the setting of one metal layer is reduced, the thickness of the film layer of the whole display panel is effectively reduced, one metal deposition and etching process is reduced, and the manufacturing efficiency of the display panel is improved.
With continued reference to fig. 4, the first end 111 and the second end 112 may alternatively be spherical; the radial width of the light emitting element 11 gradually decreases in a direction from the first end 111 toward the second end 112; the diameter of the first end 111 ranges from 2 to 15 μm; the diameter of the second end 112 ranges from 1 to 5 μm.
In this embodiment, the end of the light emitting element 11 may be spherical, although the end of the light emitting element 11 may also be a cube, the shape of the end of the light emitting element 11 is not limited in particular, in this embodiment, the end is spherical, and meanwhile, the portion between the two ends may be cylindrical, so that the light emitting element 11 can be turned to be positioned. The radial width of the light emitting element 11 gradually decreases from the first end 111 toward the second end 112, the diameter of the first end 111 may be set to be in the range of 2 to 15 μm, the diameter of the second end 112 may be set to be in the range of 1 to 5 μm, the diameter of the region between the first end 111 and the second end 112 may be larger than the second end 112 and smaller than the first end 111, and the diameter of the region between the first end 111 and the second end 112 may be set to be in the range of 1.5 to 8 μm, for example. And in the direction from the first end 111 to the second end 112, the radial width of the light-emitting element 11 gradually decreases, which is favorable for setting the gravity center O close to the first end 111, facilitating the light-emitting element 11 to realize gravity center offset and accelerating the positioning process of the light-emitting element 11.
In this embodiment, the first end 111 and the second end 112 of the size head design of the light emitting element may be formed by conductive electrodes, and the other film layers between the first end 111 and the second end 112 are also gradually reduced in diameter range in the direction of the first end 111 pointing to the second end 112. In addition, the design of the size head may be performed by other structures, specifically, as shown in fig. 6, fig. 6 is a schematic cross-sectional structure of another nano LED provided in the embodiment of the present invention, and optionally, the light emitting element may include: a strip-shaped luminous body 116 with consistent radial width at each position and an additional layer 117 coating the strip-shaped luminous body 116; the weight of the additional layer at the first end 111 of the light emitting element 11 is greater than the weight of the additional layer at the second end 112 of the light emitting element 11.
The present embodiment may use an existing stripe-shaped nano LED as the stripe-shaped light emitting body 116, where the stripe-shaped light emitting body 116 includes two ends, and a first semiconductor layer, an active layer, and a second semiconductor layer between the two ends. An additional layer 117 may be provided on the outside of the strip-shaped light-emitting body 116 and the center of gravity bias of the entire light-emitting element is achieved by the attachment layer 117, and the weight of the additional layer at the first end 111 of the light-emitting element 11 is greater than the weight of the additional layer at the second end 112 of the light-emitting element 11 to achieve the above-described size head design. The light-emitting element 11 in this embodiment is equivalent to adding a layer of gravity coat on the basis of the existing nano LED, so as to realize gravity center shift, without changing the design of the existing nano LED, and improve the preparation efficiency of the light-emitting element 11.
Fig. 7 is a schematic cross-sectional structure of another display panel according to an embodiment of the present invention, and fig. 8 is a schematic top view of a display panel according to an embodiment of the present invention, where the three-dimensional groove structure may further include: a groove bottom 132; the positioning inclined surface 131 forms an annular structure around the groove bottom 132; the lower edge of the locating ramp 131 is connected to the groove bottom 132. As shown in fig. 7, the three-dimensional groove-like structure 13 includes a groove bottom 132 and a positioning slope 131 connected to the groove bottom 132, the positioning slope 131 includes a lower edge L1 connected to the groove bottom 132 and an upper edge L2 distant from the groove bottom 132, the positioning slope 131 is disposed sequentially distant from the groove bottom 132 in a direction from the lower edge L1 toward the upper edge L2, as shown in fig. 8, in a plane of the substrate, a projection of the upper edge L2 is disposed around the lower edge L1 such that an inclination angle α is formed between the positioning slope 131 and the substrate 12. The three-dimensional groove-like structure 13 is bowl-like or bowl-like in this embodiment. The light-emitting elements 11 are positioned in the three-dimensional groove-shaped structure 13, the light-emitting elements 11 are prevented from escaping, and at least one light-emitting element 11 can be placed in the bowl-shaped three-dimensional groove-shaped structure 13, so that the arrangement number of the light-emitting elements on the unit area of the substrate 12 can be increased, and the light-emitting efficiency of the whole display panel is enhanced.
Fig. 9 is a schematic top view of another three-dimensional groove structure provided by an embodiment of the present invention, and fig. 10 is a schematic top view of another three-dimensional groove structure provided by an embodiment of the present invention, and referring to fig. 8, fig. 9 and fig. 10, alternatively, a cross-sectional contour line of the positioning inclined plane on a plane parallel to the substrate may be a circle, an ellipse or a polygon. The positioning inclined surface 131 may include various shapes, and as shown in fig. 9, a contour line formed by a cross section of the positioning inclined surface 131 on a plane parallel to the substrate may be elliptical, so that the light emitting elements 11 are respectively disposed on the positioning inclined surface 131 along the direction of the long axis L3, and the positioning accuracy of the light emitting elements 11 is further increased. Alternatively, as shown in fig. 7, the positioning inclined surface 131 has a circular cross-sectional contour on a plane parallel to the substrate, so that the light emitting elements 11 are uniformly arranged on the positioning inclined surface 131; alternatively, as shown in fig. 10, the positioning slope 131 has a polygonal cross-sectional profile on a plane parallel to the substrate, and it is also possible to facilitate uniform arrangement of the light emitting elements 11 on the positioning slope 131. The positioning inclined surface 131 provided in this embodiment includes, but is not limited to, the shape described above in the cross-sectional profile line parallel to the plane on which the substrate is located.
Fig. 11 is a schematic structural view of another three-dimensional groove structure according to an embodiment of the present invention, and optionally, the positioning inclined surface 131 may be provided with at least one limiting groove 133 pointing from the lower edge L1 to the upper edge L2; in the direction in which the lower edge L1 is directed toward the upper edge L2, the width of the limit groove 133 in the direction parallel to the lower edge L1 gradually decreases; the light emitting elements are fixed in the corresponding limit grooves 133.
In this embodiment, one or more limiting grooves 133 are disposed on the positioning inclined plane 131, when a plurality of light emitting elements are disposed in each three-dimensional groove-shaped structure 13, each limiting groove 133 is used for fixing the position of the corresponding light emitting element, which is favorable for enabling the light emitting element to automatically slide into the limiting groove 133 by the shape of the limiting groove 133, further improving the positioning accuracy of the light emitting element, and realizing the contact between the subsequent light emitting element and the driving electrode. In addition, the light-emitting element sliding into the limiting groove 133 is not easy to escape from the limiting groove 133 due to the transfer or vibration of the display panel, so that the stability of the light-emitting element is improved, the quality of the display panel is improved, and the problem that the nano LED does not emit light due to poor contact is effectively avoided. In addition, in the present embodiment, the width of the limiting groove 133 gradually decreases in the direction from the lower edge L1 to the upper edge L2, which is consistent with the variation trend of the light emitting element along the length direction, so that the big end of the light emitting element is close to the lower edge L1, the small end is close to the upper edge L2, the light emitting element is prevented from reversing, and the positioning accuracy is improved.
With continued reference to fig. 11, alternatively, the radial width of the light emitting element in the direction from the first end toward the second end may be gradually reduced; the limiting groove 133 is matched with the surface of the light-emitting element, so that the light-emitting element can automatically slide into the limiting groove 133 by the shape of the limiting groove 133, and the positioning accuracy and stability of the light-emitting element are further improved.
With continued reference to fig. 8, alternatively, the contour line of the lower edge L1 and the contour line of the upper edge L2 of the positioning slope 131 may be concentric circles in a plane parallel to the substrate. The positioning inclined planes 131 form uniform inclined planes everywhere, so that the light-emitting elements 11 can be distributed in a whole circle by taking the center O of the concentric circle as the center, close arrangement is realized, and the light-emitting efficiency is increased. If the positioning inclined surface 131 is provided with the limiting grooves 133, the limiting grooves 133 can be uniformly arranged around the circle center O', and each three-dimensional groove-shaped structure can be provided with the limiting grooves 133 with the same number, so that the light emitting uniformity of the display panel is improved.
Fig. 12 is a schematic top view of another three-dimensional groove structure according to an embodiment of the present invention, and optionally, in a plane parallel to the substrate, the projection extending direction Y of the limiting groove 133 may pass through the center O' of the concentric circles. The limiting grooves 133 are used for limiting the corresponding light emitting elements 11, in this embodiment, a plurality of limiting grooves 133 can be disposed around the center O ' of the concentric circles, and in a plane parallel to the substrate, the projection extending direction Y of the limiting grooves 133 can pass through the center O ', and the light emitting elements 11 are distributed around the center O ' in a whole circle, so that close-packed arrangement is realized, and the light emitting efficiency is increased. It should be noted that, in the present embodiment, the extending direction Y of the projection of the limiting groove 133 refers to the extending direction of the center line L4 of the limiting groove 133.
With continued reference to fig. 12, optionally, the first end 133a of the limiting groove 133 may be disposed proximate the upper edge L2; the second end 133b of the limiting groove 133 may be disposed near the lower edge L1; the first ends 133a of the limiting grooves 133 may be disposed at equal intervals along the upper edge L2. The limiting groove 133 in this embodiment may include first ends 133a and 133b, where the first end 133a of the limiting groove 133 is disposed near the upper edge L2 and is used for limiting the second end 112 of the light emitting element 11, and the second end 133b of the limiting groove 133 may be disposed near the lower edge L1 and is used for limiting the first end 111 of the light emitting element 11. The stopper groove 133 is preferably shaped to fit the surface portion of the light emitting element 11, further improving the stability of positioning the light emitting element 11. In this embodiment, the first ends 133a of the limiting grooves 133 are disposed at equal intervals along the upper edge L2 of the positioning sidewall, so that the light emitting element 11 of each three-dimensional groove structure emits light uniformly, and the light emitting effect of the display panel is improved.
Fig. 13 is a schematic top view of another three-dimensional groove structure provided in an embodiment of the present invention, alternatively, in a plane parallel to the substrate, the projected extending direction Y of the limiting groove 133 may be tangential to the lower edge L1. In this embodiment, the extending direction Y of the vertical projection of the limiting groove 133 on the substrate may not pass through the center O', but may be tangential to the lower edge L1. As shown in fig. 12, when the extending direction Y of the vertical projection of the limiting groove 133 on the substrate is tangential to the lower edge L1, the length of the limiting groove 133 can be increased to a certain extent, so that longer light emitting elements can be placed.
FIG. 14 is a schematic top view of another three-dimensional channel structure according to an embodiment of the present invention, and optionally, a plurality of limiting grooves 133 may be formed on the positioning slope; a blocking structure 134 may be disposed between adjacent limiting grooves 133 for limiting the light emitting element to the corresponding limiting groove 133. In order to increase the luminous brightness, each three-dimensional groove-shaped structure can be provided with a plurality of limit grooves 133, so that each three-dimensional groove-shaped structure is provided with more luminous elements, and in order to further enhance the positioning stability of the luminous elements positioned in the limit grooves 133, the limit grooves 133 are prevented from escaping from the corresponding limit grooves 133, and a blocking structure 134 can be arranged between the adjacent limit grooves 133, so that the accuracy of limiting is further enhanced.
With continued reference to fig. 7 and 8, the locating ramp 131 may alternatively be a smooth curved surface; each of the three-dimensional groove-like structures may be provided with a plurality of light emitting elements 11; the plurality of light emitting elements 11 are sequentially arranged on the smooth curved surface. In this embodiment, no limiting groove is disposed on the positioning inclined plane 131, the positioning inclined plane 131 is a smooth curved surface, if the three-dimensional groove-shaped structure 13 is provided with a plurality of light emitting elements 11, the plurality of light emitting elements 11 are sequentially arranged on the smooth curved surface, and adjacent light emitting elements 11 can be arranged next to each other to form a whole circle of light emitting elements 11 arranged along the positioning inclined plane 131, so that close arrangement of the light emitting elements 11 is realized, and light emitting efficiency is increased.
With continued reference to fig. 8, the first positioning electrode 141 may alternatively be a ring-shaped structure disposed along the lower edge L1; the second positioning electrode 142 may be a ring-shaped structure disposed along the upper edge L2. If a plurality of light emitting elements 11 are placed in the three-dimensional groove-shaped structure, in order to position the plurality of light emitting elements 11 at the same time, an annular positioning electrode may be disposed, the first positioning electrode 141 forms an annular structure along the lower edge L1, and the second positioning electrode 142 forms an annular structure along the upper edge L2, so that an electric field pointing from the upper edge L2 to the lower edge L1 is formed around the whole three-dimensional groove-shaped structure, so that the plurality of light emitting elements 11 can be positioned in the electric field, the first ends 111 of the light emitting elements 11 are all close to the lower edge L1 of the positioning inclined surface 131, and the second ends 112 of the light emitting elements 11 are all close to the upper edge L2 of the positioning inclined surface 131, thereby improving the positioning accuracy of the light emitting elements 11. In another embodiment, the first and second positioning electrodes 141 and 142 may also be provided in a block shape, and each light emitting element 11 is provided with the corresponding first and second positioning electrodes 141 and 142.
Similarly, alternatively, the first driving electrode 151 may have a ring-shaped structure disposed along the lower edge L1; the second driving electrode 152 may have a ring-shaped structure disposed along the upper edge L2. In this embodiment, a three-dimensional groove structure may be used as a sub-pixel, the three-dimensional groove structure includes a plurality of light emitting elements 11 with the same parameters, and all the light emitting elements 11 in the three-dimensional groove structure are driven by the same electric potential, then the first driving electrode 151 may be set to be an annular structure, connected to the first ends 111 of all the light emitting elements 11 in the three-dimensional groove structure, and the second driving electrode 152 may be set to be an annular structure, connected to the second ends 112 of all the light emitting elements 11 in the three-dimensional groove structure. In another embodiment, the first driving electrode 151 and the second driving electrode 152 may also be provided in a block shape, and each light emitting element 11 is provided with the corresponding first driving electrode 151 and second driving electrode 152, and each light emitting element 11 may be individually driven. Alternatively, when the driving electrodes are ring-shaped, the first positioning electrode 141 may be multiplexed as the first driving electrode 151, and the second positioning electrode 142 may be multiplexed as the second driving electrode 152, so as to save manufacturing cost and manufacturing process.
With continued reference to fig. 7, the groove bottom 132 may optionally be provided with a recessed feature 136; the recess structure 136 is for receiving the first end 111 of the light emitting element 11. In this embodiment, the recess structure 136 may be disposed in the area of the groove bottom 132 near the positioning inclined plane 131, where the recess structure 136 can accommodate the first end 111 of the light emitting element 11 and effectively prevent the first end 111 of the light emitting element 11 from sliding in a direction far away from the positioning inclined plane 131, so as to ensure that the light emitting element 11 is obliquely disposed along the positioning inclined plane 131, reduce the occupation of the lateral space of the light emitting element 11, and improve the positioning accuracy of the light emitting element 11.
Alternatively, the recess structure 136 may be annular in shape in the plane of the substrate 12. When a plurality of light emitting elements 11 are densely arranged in the three-dimensional groove-shaped structures 13, the annular concave structures 136 can accommodate the first ends 111 of all the densely arranged light emitting elements 11, which is beneficial to arranging more light emitting elements 11 in each three-dimensional groove-shaped structure 13 and further improving the light emitting efficiency of the display panel.
Fig. 15 is a schematic cross-sectional structure of another display panel according to an embodiment of the present invention, and alternatively, the shape of the recess 136 in the direction perpendicular to the substrate 12 may be the same as the shape of the first end 111 of the light emitting element 11 in the direction perpendicular to the substrate 11. In this embodiment, the cross-sectional shape of the concave structure 136 in the direction perpendicular to the substrate 12 may be set, as shown in fig. 11, and may be set to be the same as the cross-sectional shape of the first end 111 of the light-emitting element 11 in the direction perpendicular to the substrate 11, so that when the first end 111 of the light-emitting element 11 extends into the concave structure 136, the concave structure 136 exactly coincides with the light-emitting element 11, and the concave structure 136 can clamp the light-emitting element 11, thereby further improving the positioning accuracy of the light-emitting element 11 and improving the quality of the finally formed display panel. For example, as shown in fig. 14, if the shape of the first end 111 of the light emitting element 11 in the direction perpendicular to the substrate 11 is circular, the shape of the concave structure 136 in the direction perpendicular to the substrate 12 is also circular, so that the positioning accuracy of the light emitting element 11 is improved.
With continued reference to fig. 7, the solid slot-like structure may also optionally include a detent center post 135; the positioning groove center post 135 is disposed at a center position of the groove bottom 132 for reflecting light emitted from the light emitting element 11 to a side away from the substrate 11. In this embodiment, the positioning groove center column 135 may be further disposed at the center of the groove bottom of the three-dimensional groove structure, on one hand, the positioning groove center column 135 may perform positioning restriction on the light emitting element 11, so as to prevent the light emitting element 11 from sliding laterally from the positioning inclined plane 131 to the groove bottom 132, on the other hand, the positioning groove center column 135 includes a side wall 135a and a top surface 135b, after the light S1 emitted by the light emitting element 11 irradiates onto the side wall 135a of the positioning groove center column 135, the light S1 is reflected by the side wall 135a and exits toward the side far from the substrate 11, so as to improve the light-emitting efficiency, so that the light S1 emitted by the obliquely placed light emitting element 11 is not wasted, but is reflected to the exit surface for displaying.
Fig. 16 is a schematic cross-sectional structure of another display panel according to an embodiment of the present invention, alternatively, in a plane perpendicular to the substrate 11, a shape of a side wall 135a of the center post 135 of the positioning groove may be a convex arc protruding toward a side away from the substrate 11, and a shape of the side wall 135a of the center post 135 of the positioning groove is a convex arc protruding toward a side away from the substrate 11, so that a light S1 reflected by the side wall 135a of the center post 135 of the positioning groove can be emitted to a light emitting surface of the display panel approximately perpendicularly, thereby enhancing a light emitting effect in the three-dimensional groove structure and improving a light emitting efficiency. For example, in fig. 15, the side wall 135a of the center pillar 135 of the positioning groove is linear in a plane perpendicular to the substrate 11, referring to fig. 15 and 16, for the same light S1, the light reflected by the side wall 135a of the center pillar 135 of the positioning groove in fig. 15 tends to reflect to the positioning inclined plane 131, and the light reflected by the side wall 135a of the center pillar 135 of the positioning groove in fig. 16 is substantially directed to the light emitting side of the display panel, and the arc-shaped side wall of the center pillar 135 of the positioning groove provided in this embodiment improves the light emitting efficiency of the light emitting element 11.
Fig. 17 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention, and optionally, the positioning inclined surface 131 may be used as a bottom surface of the three-dimensional groove structure 13; the solid trough-like structure 13 further includes a second side wall 137 that forms an annular structure around the bottom surface. In this embodiment, the three-dimensional groove-shaped structure 13 includes a positioning inclined surface 131 forming a bottom surface, and a second side wall 137 surrounding the bottom surface and connected to the bottom surface, so that the light emitting element 11 can be placed at the bottom of the three-dimensional groove-shaped structure 13, and a certain inclination angle is formed between the positioning inclined surface 131 and the substrate, so that the second side wall 137 can fix the light emitting element on the positioning inclined surface 131 while reducing the lateral occupation of the light emitting element, thereby improving the positioning accuracy and stability of the light emitting element.
With continued reference to fig. 17, the positioning slope 131 may be optionally provided with a first guide groove 138 near the lower edge L1; the positioning inclined surface 131 is provided with a second guide groove 139 near the upper edge L2; in a plane perpendicular to the substrate 12, the area of the second guide groove 139 is smaller than the area of the first guide groove 139. Based on the design of the size head of the light emitting element 11, the first end 111 with a larger radial width of the light emitting element 11 is close to the lower edge L1, in this embodiment, a first guiding groove 138 may be provided in the area of the positioning inclined surface 131 close to the lower edge L1 to accommodate the first end 111 of the light emitting element 11, the second end 112 with a smaller radial width of the light emitting element 11 is close to the upper edge L2, and a second guiding groove 139 may be provided in the area of the positioning inclined surface 131 close to the upper edge L2 to accommodate the second end 112 of the light emitting element 11, where the area of the second guiding groove 139 is smaller than that of the first guiding groove 139, so that the smaller second end 112 is accommodated in the second guiding groove 139, and the larger first end 112 cannot be accommodated in the second guiding groove 139, and only the first guiding groove 139 can be accommodated.
FIG. 18 is a schematic top view of another solid slot-like structure provided by an embodiment of the present invention, alternatively, the cross-sectional profile of the solid slot-like structure 13 may be elongated extending along a first direction Z in a plane parallel to the substrate; the first direction Z is the longitudinal direction X of the light emitting element 11. The cross-sectional contour of the solid groove-like structure 13 may be an elongated shape surrounding the light emitting element 11, and the second side wall 137 of the solid groove-like structure 13 may further limit the light emitting element 11. In addition, referring to fig. 19, fig. 19 is a schematic top view of another three-dimensional groove structure provided in the embodiment of the present invention, alternatively, in a plane parallel to the substrate, a cross-sectional outline of the three-dimensional groove structure 13 may be rectangular, and a plurality of light emitting elements 11 are sequentially arranged along a direction perpendicular to Z in the three-dimensional groove structure 13, so as to improve light emitting efficiency of the display panel.
The embodiment of the invention also provides a display device. Fig. 20 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 20, the display device according to the embodiment of the present invention includes a display panel 1 according to any embodiment of the present invention. The display device may be a mobile phone as shown in fig. 20, or may be a computer, a television, an intelligent wearable device, etc., which is not limited in this embodiment.
The display device in this embodiment has the technical features of the display panel provided in any of the above embodiments, and has the beneficial effects of the display panel provided in any of the embodiments of the present invention, which are not described herein again.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (25)
1. A display panel, comprising: a substrate;
the three-dimensional groove-shaped structure is arranged on the substrate; the three-dimensional groove-shaped structure comprises a positioning inclined plane; the positioning bevel comprises a lower edge close to the substrate and an upper edge far away from the substrate;
the light-emitting element is arranged in the three-dimensional groove-shaped structure and is placed along the positioning inclined plane; the light emitting element includes a first end and a second end in a length direction; the radial width of the first end is greater than the radial width of the second end; the radial width is a width in a direction perpendicular to the length direction; a distance between the center of gravity of the light emitting element and the second end is greater than a distance between the center of gravity of the light emitting element and the first end;
The first end of the light-emitting element is close to the lower edge of the positioning inclined plane; the second end of the light-emitting element is close to the upper edge of the positioning inclined plane;
the display panel further includes: the first driving electrode and the second driving electrode are arranged on one side of the three-dimensional groove-shaped structure, which is far away from the substrate; the first driving electrode is connected with the first end of the light-emitting element; the second driving electrode is connected with the second end of the light-emitting element.
2. The display panel of claim 1, further comprising:
the first positioning electrode and the second positioning electrode are arranged on the substrate; the second positioning electrode is arranged in an insulating way with the first positioning electrode and is used for positioning the light-emitting element;
the first positioning electrode is arranged close to the lower edge of the positioning inclined plane; the second positioning electrode is arranged close to the upper edge of the positioning inclined plane.
3. The display panel of claim 2, wherein the first positioning electrode is multiplexed as a first driving electrode connected to a first end of the light emitting element; the second positioning electrode is multiplexed into a second driving electrode and is connected with the second end of the light-emitting element.
4. The display panel of claim 1, wherein the first end and the second end are spherical; the radial width of the light emitting element gradually decreases in a direction from the first end toward the second end;
the diameter of the first end ranges from 2 mu m to 15 mu m; the diameter of the second end is in the range of 1-5 μm.
5. The display panel according to claim 1, wherein the light-emitting element includes: the strip-shaped luminous bodies with consistent radial widths at all positions and an additional layer coating the strip-shaped luminous bodies;
the weight of the additional layer at the first end of the light emitting element is greater than the weight of the additional layer at the second end of the light emitting element.
6. The display panel of claim 1, wherein the solid slot-like structure further comprises: a groove bottom; the positioning inclined plane surrounds the groove bottom to form an annular structure; the lower edge of the positioning inclined plane is connected with the groove bottom.
7. The display panel of claim 6, wherein the positioning slope has a circular, elliptical or polygonal cross-sectional profile in a plane parallel to the substrate.
8. The display panel according to claim 6, wherein the positioning slope is provided with at least one limit groove pointing from the lower edge to the upper edge; the width of the limit groove in the direction parallel to the lower edge gradually decreases in the direction that the lower edge points to the upper edge;
The light-emitting element is fixed in the limit groove.
9. The display panel according to claim 8, wherein a radial width of the light emitting element in a direction from the first end toward the second end is gradually reduced;
the limit groove is matched with the surface of the light-emitting element.
10. The display panel of claim 8, wherein a contour line of the lower edge and a contour line of the upper edge of the positioning slope are concentric circles in a plane parallel to the substrate.
11. The display panel of claim 10, wherein the display panel comprises,
in a plane parallel to the substrate, the projection extending direction of the limiting groove passes through the center of the concentric circle.
12. The display panel of claim 10, wherein the first end of the limiting groove is disposed proximate the upper edge; the second end of the limiting groove is arranged close to the lower edge;
the first ends of the limiting grooves are arranged at equal intervals along the upper edge.
13. The display panel of claim 10, wherein the projection of the limiting recess extends tangentially to the lower edge in a plane parallel to the substrate.
14. The display panel of claim 8, wherein the positioning ramp includes a plurality of the limit grooves thereon;
and a blocking structure is arranged between the adjacent limiting grooves and used for limiting the light-emitting element to correspond to the limiting grooves.
15. The display panel of claim 6, wherein the positioning slope is a smooth curved surface; each three-dimensional groove-shaped structure is provided with a plurality of light-emitting elements;
the light-emitting elements are sequentially arranged on the smooth curved surface.
16. The display panel of claim 6, wherein the second positioning electrode is a ring-shaped structure disposed along the upper edge; the first positioning electrode is a ring-shaped structure arranged along the lower edge.
17. The display panel of claim 6, wherein the groove bottom is provided with a recessed structure; the recess structure is used for accommodating the first end of the light-emitting element.
18. The display panel of claim 17, wherein the recessed feature is annular in shape in the plane of the substrate.
19. The display panel according to claim 17, wherein a shape of the concave structure in a direction perpendicular to the substrate is the same as a shape of the first end of the light emitting element in a direction perpendicular to the substrate.
20. The display panel of claim 6, wherein the solid slot-like structure further comprises a detent center post;
the positioning groove center column is arranged at the center of the groove bottom and used for reflecting light emitted by the light-emitting element to one side far away from the substrate.
21. The display panel of claim 20, wherein the first sidewall of the center post of the positioning slot has a convex arc shape protruding toward a side away from the substrate in a plane perpendicular to the substrate.
22. The display panel of claim 1, wherein the locating ramp is a bottom surface of the solid channel structure;
the solid trough-like structure further includes a second sidewall forming an annular structure around the bottom surface.
23. The display panel of claim 22, wherein the positioning slope is provided with a first guide groove near the lower edge; the positioning inclined surface is provided with a second guide groove close to the upper edge;
the second guide groove has an area smaller than an area of the first guide groove in a plane perpendicular to the substrate.
24. The display panel of claim 22, wherein a cross-sectional profile of the solid slot-like structure is elongated extending along a first direction in a plane parallel to the substrate; the first direction is a length direction of the light emitting element.
25. A display device comprising a display panel as claimed in any one of the preceding claims 1-24.
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