Display panel, preparation method thereof and display device

Abstract

The present disclosure provides a display panel, a preparation method thereof and a display device, and belongs to the technical field of display. The display panel comprises a driving back plate, a light-emitting functional layer and a light extraction layer, the light-emitting functional layer and the light extraction layer are sequentially located on a bearing surface of the driving back plate; the light-emitting functional layer comprises a plurality of light-emitting units arranged in an array; the light extraction layer comprises a first sub-layer and a second sub-layer, the first sub-layer and the second sub-layer are sequentially stacked on the light-emitting functional layer, the refractive index of the first sub-layer is lower than the refractive index of the second sub-layer, the first sub-layer has a plurality of grooves, each groove in the plurality of grooves is opposite to a light-emitting unit in the plurality of light-emitting units, and part of the second sub-layer is located in the plurality of grooves; at least part of the outer contour of the orthographic projection of the groove on the bearing surface is located in the orthographic projection of the corresponding light-emitting unit on the bearing surface. The present disclosure can make more light exit from the display panel and improve the light extraction effect of the display panel.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, in particular to a display panel, a preparation method thereof and a display device. BACKGROUND

[0002] An organic light-emitting diode (OLED) display panel is a multi-layer film structure. After light is emitted from a light-emitting functional layer, the light will be reflected and refracted by the multi-layer film layers located on the light-emitting functional layer, resulting in a large amount of light loss and affecting the light-out effect of the display panel. SUMMARY

[0003] The present disclosure provides a display panel, a preparation method thereof and a display device, which can make more light exit from the display panel and improve the light-out effect of the display panel. The technical solution is as follows:

[0004] The display panel provided by the present disclosure includes a driving backplane, a light-emitting functional layer and a light extraction layer. The light-emitting functional layer and the light extraction layer are sequentially located on a bearing surface of the driving backplane. The light-emitting functional layer includes a plurality of light-emitting units arranged in an array. The light extraction layer includes a first sub-layer and a second sub-layer. The first sub-layer and the second sub-layer are sequentially stacked on the light-emitting functional layer. The refractive index of the first sub-layer is lower than the refractive index of the second sub-layer. The first sub-layer has a plurality of grooves. Each groove in the plurality of grooves is opposite to a light-emitting unit in the plurality of light-emitting units. Part of the second sub-layer is located in the plurality of grooves. At least part of the outer contour of the orthographic projection of the groove on the bearing surface is located in the orthographic projection of the corresponding light-emitting unit on the bearing surface.

[0005] In an implementation manner of the display panel provided by the present disclosure, a side wall of at least one groove in the plurality of grooves has a protrusion. The orthographic projection of the protrusion on the bearing surface is located in the orthographic projection of the light-emitting unit on the bearing surface. Part of the surface of the protrusion is coplanar with the side surface of the first sub-layer close to the light-emitting unit.

[0006] In another implementation manner of the display panel provided by the present disclosure, the maximum height of the protrusion is 1-3 μm, and the maximum width of the protrusion is 1-5 μm.

[0007] In another implementation manner of the display panel provided by the present disclosure, the outer wall surface of the protrusion is a conical surface. One end of the protrusion with a larger size is coplanar with the side surface of the first sub-layer close to the light-emitting unit. The cross section of the protrusion parallel to the bearing surface is semicircular.

[0008] In another implementation manner of the embodiment of the present disclosure, the outer wall surface of the protrusion is a cylindrical surface, and a straight generatrix of the cylindrical surface is parallel to the side wall of the groove.

[0009] In another implementation manner of the embodiment of the present disclosure, the protrusion is multiple, and the multiple protrusions are distributed around the geometric center of the groove.

[0010] In another implementation manner of the embodiment of the present disclosure, the groove has multiple side walls connected in sequence, and each side wall of the groove has at most one protrusion.

[0011] In another implementation manner of the embodiment of the present disclosure, the protrusion is in a frame shape, and the geometric center of the protrusion is the same as the geometric center of the groove.

[0012] In another implementation manner of the embodiment of the present disclosure, the side wall of the groove has a recessed portion recessed in a direction away from the geometric center of the groove, and the recessed portion is located at least on the side of the first sub-layer close to the light-emitting functional layer; at least part of the orthographic projection of the recessed portion on the bearing surface is located outside the orthographic projection of the corresponding light-emitting unit on the bearing surface.

[0013] In another implementation manner of the embodiment of the present disclosure, the orthographic projection of the recessed portion on the bearing surface is a rectangle, a trapezoid or a triangle.

[0014] In another implementation manner of the embodiment of the present disclosure, the recessed depth of the recessed portion is not greater than 5 μm.

[0015] In another implementation manner of the embodiment of the present disclosure, the groove has a first opening and a second opening, the first opening is located on the side of the first sub-layer close to the driving backboard, the second opening is located on the side of the first sub-layer away from the driving backboard, and the orthographic projection of the first opening on the bearing surface is located in the orthographic projection of the second opening on the bearing surface.

[0016] In another implementation manner of the embodiment of the present disclosure, the included angle between the side wall of the groove and the driving backboard is 40° to 80°.

[0017] In another implementation manner of the embodiment of the present disclosure, the side wall of the groove comprises multiple planes connected in sequence between the first opening and the second opening, and the two connected planes have an included angle.

[0018] In another implementation manner of the embodiment of the present disclosure, the side wall of the groove is a curved surface, and the side wall of the groove is recessed in a direction away from the center of the groove.

[0019] In another implementation manner of the embodiment of the present disclosure, the grooves correspond to the light emitting units one by one.

[0020] In another implementation manner of the embodiment of the present disclosure, the first sub-layer is a transparent optical material layer or an ink material layer, and the second sub-layer is a transparent optical material layer or an ink material layer.

[0021] In another implementation manner of the embodiment of the present disclosure, the display panel further comprises a touch layer and an encapsulation layer, the encapsulation layer and the touch layer are sequentially stacked between the light emitting functional layer and the light extraction layer, and the first sub-layer and the second sub-layer are sequentially stacked on the touch layer.

[0022] The embodiment of the present disclosure provides a preparation method of a display panel, the preparation method comprising: providing a driving back plate; forming a light emitting functional layer on a bearing surface of the driving back plate, the light emitting functional layer comprising a plurality of light emitting units arranged in an array; forming a light extraction layer on the light emitting functional layer, the light extraction layer comprising a first sub-layer and a second sub-layer, the first sub-layer and the second sub-layer being sequentially stacked on the light emitting functional layer, a refractive index of the first sub-layer being lower than a refractive index of the second sub-layer, the first sub-layer having a plurality of grooves, each groove of the plurality of grooves corresponding to one light emitting unit of the plurality of light emitting units, and part of the second sub-layer being located in the plurality of grooves; at least part of an outer contour of a normal projection of the grooves on the bearing surface is located in a normal projection of the corresponding light emitting unit on the bearing surface.

[0023] The embodiment of the present disclosure provides a display device, which comprises a power supply assembly and the display panel as described above, and the power supply assembly is electrically connected with the display panel.

[0024] The technical scheme provided by the embodiment of the present disclosure has at least the following beneficial effects:

[0025] In the display panel provided by the embodiment of the present disclosure, the driving back plate, the light emitting functional layer and the light extraction layer are sequentially stacked, wherein two sub-layers with different refractive indexes and being stacked are arranged on the light emitting layer. The first sub-layer with a low refractive index has grooves, and the second sub-layer with a high refractive index is partially located in the grooves to fill the grooves. In this way, when the light is obliquely irradiated from the light emitting functional layer to the interface between the sidewall of the groove and the second sub-layer, the light is reflected because the light is irradiated from the second sub-layer with a high refractive index to the second sub-layer with a low refractive index, so as to change the emission direction of the obliquely emitted light, and the light can be emitted from the display panel after being reflected at the interface, so as to improve the forward light extraction efficiency.

[0026] Meanwhile, the outer contour of the projection of the groove is partially within the projection of the light emitting unit, that is, the first sub-layer has a region directly opposite the light emitting unit. Thus, part of the light emitted by the light emitting unit opposite the region can enter the first sub-layer of the low refractive index corresponding to the region. When the light enters the second sub-layer of the high refractive index from the first sub-layer of the low refractive index, refraction occurs, so that the refraction angle of the light is smaller than the incident angle of the light. Thus, part of the light emitted by the light emitting unit at the edge position in the direction away from the center of the light emitting unit is close to the center of the light emitting unit, thereby further increasing the light emitted in the forward direction and improving the light extraction efficiency of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a plan view of a display panel provided by an embodiment of the present disclosure;

[0029] Figure 2 is a cross-sectional view of a display panel provided by an embodiment of the present disclosure;

[0030] Figure 3 is a projection relationship diagram of a first sub-layer and a light emitting unit provided by an embodiment of the present disclosure;

[0031] Figure 4 is a cross-sectional view of a display panel provided by an embodiment of the present disclosure;

[0032] Figure 5 is a structure diagram of a light extraction layer provided by an embodiment of the present disclosure;

[0033] Figure 6 is a structure diagram of a light extraction layer provided by an embodiment of the present disclosure;

[0034] Figure 7 is a structure diagram of a light extraction layer provided by an embodiment of the present disclosure;

[0035] Figure 8 is a partial structure diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0036] Figure 9 is a partial structure diagram of another first sub-layer provided by an embodiment of the present disclosure;

[0037] Figure 10is a partial structure schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0038] Figure 11 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0039] Figure 12 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0040] Figure 13 is a partial structure schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0041] Figure 14 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0042] Figure 15 is a cross-sectional view of a first sub-layer provided by an embodiment of the present disclosure;

[0043] Figure 16 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0044] Figure 17 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0045] Figure 18 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0046] Figure 19 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0047] Figure 20 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0048] Figure 21 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0049] Figure 22 is a plane schematic diagram of a first sub-layer provided by an embodiment of the present disclosure;

[0050] Figure 23 is a cross-sectional schematic diagram of a display panel provided by an embodiment of the present disclosure;

[0051] Figure 24 is a flowchart of a preparation method of a display panel provided by an embodiment of the present disclosure.

[0052] The following is a description of the various marks in the drawings:

[0053] 10, drive backplane;

[0054] 20, light-emitting functional layer; 21, light-emitting unit; 22, encapsulation layer; 23, pixel definition layer;

[0055] 30, light extraction layer; 31, first sub-layer; 310, groove; 311, first opening; 312, second opening; 32, second sub-layer;

[0056] 40, protrusion;

[0057] 50, recess;

[0058] 60, touch layer. DETAILED DESCRIPTION

[0059] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the drawings.

[0060] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first", "second", "third" and similar terms used in the specification and claims of the present patent application do not denote any order, quantity or importance, but are used to distinguish different components. Similarly, the terms "one" or "a" or similar terms do not denote a quantity limitation, but denote the existence of at least one. The terms "include" or "contain" or similar terms mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", "top", "bottom" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0061] Figure 1 is a plan view of a display panel provided by an embodiment of the present disclosure. As shown in Figure 1 , the display panel includes a display area X and a non-display area Y surrounding the display area X, and a plurality of light-emitting units arranged in an array are included in the display area X. The structure of the display panel is described below by way of example of a cross section at one of the light-emitting units.

[0062] Figure 2 is a cross-sectional view of a display panel provided by an embodiment of the present disclosure. Figure 2 is Figure 1 the cross-sectional view shown at AA in Figure 2As shown, the display panel includes a driving backplate 10, a light-emitting functional layer 20, and a light extraction layer 30, which are sequentially located on a bearing surface of the driving backplate 10.

[0063] The bearing surface refers to a surface of the driving backplate 10 for bearing other film layers. For example, when the light-emitting functional layer is formed on the driving backplate, the surface of the driving backplate 10 in contact with the light-emitting functional layer 20 is the bearing surface.

[0064] As shown in FIG. 1, Figure 2 the light-emitting functional layer includes a plurality of light-emitting units 21 arranged in an array. The light-emitting functional layer includes a pixel defining layer 23 having a plurality of openings, and each opening is provided with a light-emitting unit. The range of the opening of the pixel defining layer is the outer contour range of the light-emitting unit.

[0065] As shown in FIG. 1, Figure 2 the light extraction layer 30 includes a first sub-layer 31 and a second sub-layer 32, which are sequentially stacked on the light-emitting functional layer 20. The refractive index of the first sub-layer 31 is lower than that of the second sub-layer 32. The first sub-layer 31 has a plurality of grooves 310 (only one is shown in the figure), and part of the second sub-layer 32 is located in the plurality of grooves 310. Figure 2

[0066] Figure 3 is a projection relationship diagram of the first sub-layer and the light-emitting unit provided by the embodiment of the present disclosure. As shown in FIG. 1, Figure 3 each groove 310 is opposite to one light-emitting unit 21 (see the dashed line in the figure) of the plurality of light-emitting units 21. At least part of the outer contour of the orthographic projection of the groove 310 on the bearing surface (see the solid line in the figure) is located in the orthographic projection of the corresponding light-emitting unit 21 on the bearing surface (see the dashed line in the figure). Here, the orthographic projection of the light-emitting unit 21 on the bearing surface can be the orthographic projection of the pixel defining layer 23 in the light-emitting layer.

[0067] Figure 4 is a cross-sectional schematic view of a display panel provided by the embodiment of the present disclosure. Figure 4 The cross section shown in FIG. 2 is Figure 3 The cross-sectional view shown at NN in FIG. 2. As shown in FIG. 2, Figure 4 In the area where no protrusion 40 is arranged in the groove 310, in the direction of the NN cross-sectional line, the width K of the groove of the first sub-layer 31 is not less than the length of the light-emitting unit 21.

[0068] Figure 2 is also Figure 4 the cross-sectional view shown at MM in FIG. 2. As shown in FIG. 2, Figure 2 ​As shown, in the area where the protrusion 40 is arranged in the groove 310, in the direction of the MM cross-section line, the width of the groove of the first sub-layer 31 is smaller than the length of the light-emitting unit 21, so that at least part of the outer contour of the orthographic projection of the groove 310 on the bearing surface is located within the orthographic projection of the corresponding light-emitting unit 21 on the bearing surface.

[0069] In the display panel provided by the embodiments of the present disclosure, the driving backboard 10, the light-emitting functional layer 20, and the light extraction layer 30 are sequentially stacked, wherein two sub-layers with different refractive indexes are arranged on the light-emitting layer. The first sub-layer 31 with a low refractive index has a groove 310, and the second sub-layer 32 with a high refractive index is partially located in the groove 310 to fill the groove 310. In this way, when the light is obliquely irradiated from the light-emitting functional layer 20 to the interface between the sidewall of the groove 310 and the second sub-layer 32, the light is reflected because it is emitted from the second sub-layer 32 with a high refractive index to the first sub-layer 32 with a low refractive index, thereby changing the emission direction of the obliquely emitted light and enabling the light to be emitted from the display panel after being reflected at the interface.

[0070] Meanwhile, part of the outer contour of the orthographic projection of the groove 310 is within the orthographic projection of the light-emitting unit 21, that is, part of the area of the first sub-layer 31 is directly opposite the light-emitting unit 21, so that part of the light emitted by the light-emitting unit opposite the part of the area can enter the first sub-layer 31 with a low refractive index corresponding to the part of the area. When the light enters the second sub-layer 32 with a high refractive index from the first sub-layer 31 with a low refractive index, refraction occurs, so that the refraction angle of the light is smaller than the incidence angle of the light, thereby enabling part of the light emitted from the edge position of the light-emitting unit 21 in a direction away from the center of the light-emitting unit to move closer to the center of the light-emitting unit, thereby further increasing the forward emission of the light and improving the light extraction efficiency of the display panel.

[0071] The light-emitting unit 21 comprises an anode layer, a light-emitting layer, and a cathode layer which are sequentially stacked.

[0072] Exemplarily, the light-emitting layer can comprise a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), an electron injection layer (EIL), a hole block layer (HBL), an electron block layer (EBL), and a light-emitting material layer. The electron injection layer, the electron transport layer, the hole block layer, the light-emitting material layer, the hole transport layer, the hole injection layer, and the electron block layer are sequentially stacked.

[0073] Optionally, the cathode layer can be a transparent conductive layer, and the anode layer can be a transparent conductive layer or a metal layer.

[0074] For example, the transparent conductive layer can be an ITO (Indium tin oxide) layer and an IZO (Indium Zinc Oxide) layer.

[0075] For example, the metal layer can be a Mg, Al, Au, Pt, Cu, etc. metal layer. The metal layer can be a single metal layer or stacked by at least two metal layers.

[0076] The driving backboard 10 can include a substrate and a plurality of driving circuits, and the plurality of driving circuits are arranged in an array on the substrate. Each driving circuit is connected with a corresponding light emitting unit 21. For example, the driving circuit is electrically connected with the anode layer of the light emitting unit 21. In this way, the light emitting unit 21 can emit light under the driving of the connected driving circuit.

[0077] In the embodiments of the present disclosure, the driving backboard 10 can be a TFT (Thin Film Transistor) substrate, and each driving circuit on the driving backboard 10 includes at least two TFTs for controlling the light emitting unit 21 connected thereto to emit light.

[0078] For example, the driving circuit includes an active layer, a gate insulating layer, a gate layer, an interlayer dielectric layer and a source-drain layer which are stacked in sequence on the substrate. The light emitting unit 21 is connected with the source-drain layer of the corresponding driving circuit.

[0079] For example, the substrate can be made of glass, quartz, plastic, etc.; the active layer can be made of amorphous silicon, polysilicon or metal oxide semiconductor, etc.; the gate insulating layer can be made of silicon oxide, silicon nitride, silicon oxynitride, etc.; the gate metal layer can be a single layer of metal film such as molybdenum, copper, titanium, etc., or a multi-layer metal film such as molybdenum / aluminum / molybdenum or titanium / aluminum / titanium, etc.; the interlayer dielectric layer can be made of silicon oxide, silicon nitride, etc.; and the source-drain metal layer can be a single layer of metal film such as aluminum, molybdenum, copper, titanium, etc., or a multi-layer metal film such as molybdenum / aluminum / molybdenum or titanium / aluminum / titanium, etc.

[0080] For example, when the active layer of each TFT of the driving backboard is made of polysilicon, the driving backboard is an LTPS (Low Temperature Poly-Silicon) driving backboard.

[0081] Exemplarily, when the active layers of some TFTs in the TFTs driving the backplane are made of polysilicon and the active layers of other TFTs are made of metal oxide, the backplane is an LTPO (Low Temperature Polycrystalline Oxide) backplane.

[0082] It should be noted that the TFT substrate structure with a single-layer gate metal layer is only exemplified, and the TFT substrate structure can also be a double-layer gate metal layer or other structures, which are not limited by the embodiments of the present disclosure.

[0083] Optionally, as shown in FIG. 3, the recesses 310 correspond to the light emitting units 21 one by one. Figure 3 In other implementations, the number of recesses 310 can be less than the number of light emitting units 21, each recess 310 has one light emitting unit 21 corresponding thereto, and part of the light emitting units 21 do not have recesses 310 corresponding thereto.

[0084] In the embodiments of the present disclosure, the shape of the recess can be any shape, such as a rectangle, a circle, an ellipse, or a polygon, and the arrangement of the recesses can also be arranged in any way.

[0085] In some examples, the light emitting units include light emitting units of multiple colors, and the sizes of the light emitting units of different colors are different, and accordingly, the sizes of the recesses 310 corresponding to the light emitting units are also different.

[0086] For example, the area of the red light emitting unit R is greater than the area of the green light emitting unit G, and the area of the green light emitting unit G is greater than the area of the blue light emitting unit B. Among them, the area of the recess 310 corresponding to the red light emitting unit R is also greater than the area of the recess 310 corresponding to the green light emitting unit G, and the area of the recess 310 corresponding to the green light emitting unit G is also greater than the area of the recess 310 corresponding to the blue light emitting unit B.

[0087] Optionally, the first sub-layer 31 is a transparent optical material layer or an ink material layer, and the second sub-layer 32 is a transparent optical material layer or an ink material layer.

[0088] The transparent optical material layer can be a polyimide resin layer or an acrylic material layer, and the ink material layer can be an acrylic material layer or an epoxy material layer.

[0089] Optionally, as shown in FIG. 3, the recesses 310 correspond to the light emitting units 21 one by one. Figure 2As shown, the groove 310 has a first opening 311 and a second opening 312, the first opening 311 is located on the side of the first sub-layer 31 close to the driving back plate 10, and the second opening 312 is located on the side of the first sub-layer 31 away from the driving back plate 10, the orthographic projection of the first opening 311 on the bearing surface is located within the orthographic projection of the second opening 312 on the bearing surface. That is, the opening of the groove 310 close to the driving back plate 10 is smaller than the opening of the groove 310 away from the driving back plate 10.

[0090] In some implementations, as shown in FIG. 3, the groove 310 has a first opening 311 and a second opening 312, the first opening 311 is located on the side of the first sub-layer 31 close to the driving back plate 10, and the second opening 312 is located on the side of the first sub-layer 31 away from the driving back plate 10, the orthographic projection of the first opening 311 on the bearing surface is located within the orthographic projection of the second opening 312 on the bearing surface. That is, the opening of the groove 310 close to the driving back plate 10 is smaller than the opening of the groove 310 away from the driving back plate 10. Figure 2 As shown, the side wall of the groove 310 is a plane. That is, the side wall of the groove 310 is inclined relative to the driving back plate 10.

[0091] In this way, when the light is obliquely irradiated from the light emitting unit 21 to the interface between the side wall of the groove 310 and the second sub-layer 32, since the light is emitted from the second sub-layer 32 with high refractive index to the first sub-layer 31 with low refractive index, the light will be reflected at the interface, thereby changing the exit angle of the obliquely emitted light. Since the side wall of the groove 310 is inclined, the exit direction of the light after reflection on the side wall of the groove 310 is more likely to be perpendicular to the light exit surface of the display panel, so that more light is emitted in the forward direction.

[0092] Exemplarily, as shown in FIG. 3, the angle α between the side wall of the groove 310 and the driving back plate 10 is 40° to 80°. Figure 2

[0093] By limiting the angle between the side wall of the groove 310 and the driving back plate 10 within the above range, the inclination angle of the side wall can be avoided to be too large or too small, and the function of controlling the exit direction of the light to be perpendicular to the light exit surface of the display panel cannot be achieved.

[0094] For example, the angle between the side wall of the groove 310 and the driving back plate 10 is 60°. By setting the inclination angle of the side wall of the groove 310 to this angle, part of the light incident to the side wall of the groove can have an angle within a certain range with the side wall of the groove, so that the light is totally reflected, the light extraction efficiency is improved, and the exit direction of most of the light is adjusted to be perpendicular to the light exit surface of the display panel, so that the light extraction efficiency in the forward direction is improved.

[0095] Wherein, when the angle θ between the light and the side wall of the groove is less than or equal to 90-arcsin(n2 / n1), total reflection occurs. The refractive index of the first sub-layer is n2, and the refractive index of the second sub-layer is n1.

[0096] In some other implementations, as shown in FIG. 4, the side wall of the groove 310 is a curved surface. Figure 5 is a structural schematic diagram of a light extraction layer provided by an embodiment of the present disclosure. As shown in FIG. 4, the side wall of the groove 310 is a curved surface. Figure 5 ​As shown in the figure, the side wall of the groove 310 is curved, and the side wall of the groove 310 is recessed towards the center of the groove 310.

[0097] As shown in the figure, Figure 5 As shown in the figure, the side wall of the groove 310 can be a circular arc surface.

[0098] In some other implementations, Figure 6 is a structural schematic diagram of a light extraction layer provided by an embodiment of the present disclosure. As shown in the figure, Figure 6 As shown in the figure, the side wall of the groove 310 is curved, and the side wall of the groove 310 is recessed towards the center of the groove 310.

[0099] As shown in the figure, Figure 6 As shown in the figure, the side wall of the groove 310 can be a circular arc surface.

[0100] By setting the side wall of the groove 310 as a circular arc surface, the obliquely emitted light is reflected on the circular arc surface, and the emission direction of the reflected light tends to be perpendicular to the light-emitting surface of the display panel, so that more light is emitted in the forward direction.

[0101] Optionally, the side wall of the groove 310 includes a plurality of planes connected in sequence between the first opening and the second opening, and the two connected planes have an included angle therebetween.

[0102] As shown in the figure, Figure 7 is a structural schematic diagram of a light extraction layer provided by an embodiment of the present disclosure. As shown in the figure, Figure 7 As shown in the figure, the side wall of the groove is two connected planes, and the included angle between the two connected planes is an obtuse angle.

[0103] By setting the side wall of the groove 310 as two connected planes, the light emitted at the same angle to the side wall of the groove can be emitted from the display panel at different angles, so as to increase the light-emitting area of the light-emitting unit.

[0104] It should be noted that the side wall of the groove 310 can also be other structures, as long as the obliquely emitted light is reflected at the side wall of the groove 310, so that the light can be emitted along the direction perpendicular to the display panel, and the present disclosure does not make any limitation.

[0105] Optionally, as shown in the figure, Figure 2 , 3 As shown in the figure, the side wall of at least one groove 310 of the plurality of grooves 310 has a protrusion 40, the orthographic projection of the protrusion 40 on the bearing surface is located within the orthographic projection of the light-emitting unit 21 on the bearing surface, and part of the surface of the protrusion 40 is coplanar with the side surface of the first sub-layer 31 close to the light-emitting unit 21.

[0106] Part of the surface of the protrusion 40 and the side of the first sub-layer 31 close to the light-emitting unit 21 are in contact with the same surface of the same film layer. For example, when the first sub-layer 31 is directly located on the light-emitting functional layer 20, part of the surface of the protrusion 40 is in contact with the side of the light-emitting unit 21 close to the first sub-layer.

[0107] In the embodiments of the present disclosure, the protrusion 40 extends to the center of the groove 310, so that the orthographic projection of the protrusion 40 on the bearing surface is located within the orthographic projection of the corresponding light-emitting unit 21 on the bearing surface.

[0108] In the above implementation, compared with the side wall of the groove 310 without the protrusion 40, the protrusion 40 arranged on the side wall of the groove 310 can increase the reflection area of the side wall of the groove 310, thereby further improving the forward light emission. At the same time, the protrusion 40 is directly opposite to the light-emitting unit 21, so that the part of the light-emitting unit 21 opposite to the protrusion 40 emits light, and the light can be directly incident into the first sub-layer 31 with low refractive index. When the light enters the second sub-layer 32 with high refractive index from the first sub-layer 31 with low refractive index, refraction occurs. Referring to the light path shown in Figure 2 , part of the light is emitted towards the periphery of the display panel. Not only more light is emitted from the display panel, but also the display panel can uniformly emit light at each position, thereby improving the overall light emission effect of the display panel.

[0109] Optionally, as shown in Figure 3 , the maximum height L of the protrusion 40 is 1 μm to 3 μm, and the maximum width h of the protrusion 40 is 1 μm to 5 μm.

[0110] The height of the protrusion is the maximum distance from the point of the outer wall surface of the protrusion in the cross section parallel to the bearing surface to the side wall of the groove.

[0111] The width of the protrusion is the maximum distance of the protrusion in the cross section parallel to the bearing surface and perpendicular to the height direction of the protrusion.

[0112] In some implementations, Figure 8 is a partial structure diagram of a first sub-layer provided by an embodiment of the present disclosure. As shown in Figure 8 , the outer wall surface of the protrusion 40 is a conical surface, and the larger end of the protrusion 40 is coplanar with the side of the first sub-layer 31 close to the light-emitting unit 21. As shown in Figure 2 , the cross section of the protrusion 40 parallel to the bearing surface is semicircular.

[0113] The outer wall surface of the protrusion 40 refers to the surface of the protrusion 40 in contact with the second sub-layer 32.

[0114] The protrusion 40 is conical in shape, which can make the light emitted by the light emitting unit 21 opposite to the protrusion 40 directly incident into the first sub-layer 31 of low refractive index, refract at the junction of the first sub-layer 31 and the second sub-layer 32, and make part of the light exit towards the periphery of the display panel. Since the outer wall surface of the protrusion 40 is a conical surface, compared with an inclined surface, most of the light from the second sub-layer 32 to the first sub-layer 31 in various directions can be reflected by the conical surface and exit from the light extraction layer at a similar exit angle, so as to adjust the light incident to the first sub-layer 31 in various directions to be perpendicular to the light exit surface of the display panel.

[0115] Optionally, as shown in Figure 3 , the maximum radius of the cross section of the protrusion 40 in the direction parallel to the driving back plate 10 is 1 μm to 3 μm.

[0116] By setting the size of the protrusion 40 in the above range, it can avoid that the size of the protrusion 40 is too large, which reduces the size of the groove 310 and reduces the amount of light emitted in the forward direction. It can also avoid that the size of the protrusion 40 is too small, which cannot effectively improve the light emission rate in the forward direction.

[0117] Exemplarily, as shown in Figure 3 , the maximum radius of the protrusion 40 can be 1 μm to 2 μm. The maximum radius of the protrusion 40 is the radius of the side of the protrusion 40 towards the one end of the driving back plate 10. For example, the maximum radius of the protrusion 40 can be 2 μm.

[0118] Figure 9 is another partial structure diagram of the first sub-layer provided by the embodiment of the present disclosure. As shown in Figure 9 , the outer wall surface of the protrusion 40 is the arc side of a circular truncated cone, and the larger end of the protrusion 40 is coplanar with the side of the first sub-layer 31 close to the light emitting unit 21.

[0119] Since the protrusion 40 is a circular truncated cone, compared with the conical protrusion 40, the area of the outer wall surface of the circular truncated cone is larger, which can provide a larger area for light reflection and adjust the light incident to the first sub-layer 31 in various directions to be perpendicular to the light exit surface of the display panel.

[0120] Figure 10 is another partial structure diagram of the first sub-layer provided by the embodiment of the present disclosure. As shown in Figure 10 , the outer wall surface of the protrusion 40 is a cylindrical surface, and the straight generatrix of the cylindrical surface is parallel to the side wall of the groove 310.

[0121] The protrusion 40 is set in a cylindrical shape. In addition to enabling the light-emitting unit 21 opposite to the protrusion 40 to emit light directly into the first sub-layer 31 of low refractive index, the light is refracted at the junction of the first sub-layer 31 and the second sub-layer 32, and part of the light is emitted towards the periphery of the display panel. Since the outer wall surface of the protrusion 40 is a cylindrical surface, compared with an inclined surface, light of various directions from the second sub-layer 32 to the first sub-layer 31 is well reflected on the outer wall surface of the protrusion 40, so as to adjust the light of various directions incident on the first sub-layer 31 to be perpendicular to the light-emitting surface of the display panel.

[0122] Figure 11 FIG. 1 is a plan view of a first sub-layer according to an embodiment of the present disclosure. Figure 11 Figure 10 FIG. 2 is a plan view of a first sub-layer according to an embodiment of the present disclosure. Figure 11 As shown in FIG. 2, the protrusion 40 has a semicircular cross section in the direction parallel to the driving back plate 10. Compared with the protrusion 40 set in a conical shape, the protrusion 40 of the same size (radius) has a larger area opposite to the light-emitting unit 21, so as to enable more light to directly enter the first sub-layer 31, thereby enabling more light to be emitted towards the periphery of the display panel, and enabling the display panel to uniformly emit light at each position, thereby improving the overall light-emitting effect of the display panel.

[0123] Optionally, the radius of the protrusion 40 is not more than 3 μm. For example, the radius of the protrusion 40 can be 2 μm.

[0124] By setting the size of the protrusion 40 in the above range, it can be avoided that the size of the protrusion 40 is set too large, the size of the groove 310 is reduced, and the amount of light emitted in the forward direction is reduced. It can also be avoided that the size of the protrusion 40 is set too small, and the light-emitting rate in the forward direction cannot be effectively improved.

[0125] In some implementations of the embodiments of the present disclosure, as shown in FIG. 3, the protrusion 40 has a plurality of protrusions 40, and the plurality of protrusions 40 are distributed in a ring shape around the geometric center of the groove 310. Figure 3

[0126] By setting the plurality of protrusions 40 on the side wall of the groove 310, the area of the protrusion 40 opposite to the light-emitting unit 21 can be increased, so as to enable more light to directly enter the first sub-layer 31, thereby enabling more light to be emitted towards the periphery of the display panel, and improving the overall light-emitting effect of the display panel.

[0127] Optionally, the groove 310 has a plurality of side walls connected in sequence and end to end, and each side wall of the groove 310 has at most one protrusion 40.

[0128] For example, as shown in FIG. 4, the protrusion 40 has a plurality of protrusions 40, and the plurality of protrusions 40 are distributed in a ring shape around the geometric center of the groove 310. Figure 3 ​​As shown, the groove 310 includes four side walls connected in sequence end to end, and two adjacent side walls are perpendicular. Each side wall of each groove 310 is provided with a protrusion 40.

[0129] In this way, each side wall of the groove 310 can allow part of the light to directly enter the first sub-layer, so that each side wall has light emitted towards the periphery of the display panel, thereby improving the overall light emission effect of the display panel.

[0130] Exemplarily, Figure 12 is a plan view of a first sub-layer provided by an embodiment of the present disclosure. As shown, Figure 12 As shown, the groove 310 includes four side walls connected in sequence end to end, and two adjacent side walls are perpendicular. Part of the side walls of part of the grooves 310 can not be provided with the protrusion 40, and each side wall of the other part of the grooves 310 is provided with the protrusion 40, so as to meet the requirement of improving the overall light emission effect of the display panel while ensuring the forward light emission rate of the light.

[0131] It should be noted that the side walls of part of the grooves 310 can also not be provided with the protrusion 40 in the groove 310, as long as the overall light emission effect of the display panel meets the requirement, and the present disclosure does not limit this.

[0132] Figure 13 is a partial structure view of a first sub-layer provided by an embodiment of the present disclosure. As shown, Figure 13 As shown, the protrusion 40 is in a frame shape, and the geometric center O of the protrusion 40 is the same as the geometric center O of the groove 310.

[0133] The frame shape can refer to a symmetrical shape with an inner hole, for example, the frame shape can be a square frame, a circular ring, etc. The geometric center is the most central position of a figure with certain symmetry, for example, when the figure is a circular ring, the geometric center is the center of the circular ring.

[0134] By setting the protrusion 40 in a frame shape, the area opposite to the light emitting unit 21 of the protrusion 40 can be maximized, so that more light can directly enter the first sub-layer 31, and more light can be emitted towards the periphery of the display panel, thereby improving the overall light emission effect of the display panel.

[0135] In the present embodiment, the shape of the cross section of the groove 310 in the direction parallel to the driving back plate 10 can be the same as the shape of the cross section of the protrusion 40 in the direction of the driving back plate 10, so that the outer edge of the protrusion 40 is connected to the side wall of the groove 310.

[0136] Exemplarily, Figure 13 As shown, the cross section of the groove 310 and the cross section of the protrusion 40 can both be circular, that is, the protrusion 40 is in a circular ring shape.

[0137] Exemplarily, the cross section of the groove 310 and the cross section of the protrusion 40 can both be rectangular.

[0138] Figure 14 is a plan view of a first sub-layer provided by an embodiment of the present disclosure. As shown in Figure 14 The side wall of the groove 310 has a recessed portion 50 recessed in a direction away from the geometric center of the groove 310, and the recessed portion 50 is located at least on the side of the first sub-layer 31 close to the light-emitting functional layer 20.

[0139] As shown in Figure 14 At least part of the orthographic projection of the recessed portion 50 on the bearing surface is located outside the orthographic projection of the corresponding light-emitting unit 21 on the substrate of the driving backboard 10.

[0140] In some implementations, the orthographic projection of the groove on the substrate, except for the protrusion, covers the orthographic projection of the light-emitting unit on the substrate. At this time, the orthographic projection of the recessed portion on the substrate is completely located outside the orthographic projection of the corresponding light-emitting unit on the substrate.

[0141] In other implementations, part of the recessed portion is opposite to the light-emitting unit, and the orthographic projection of the other part of the recessed portion on the substrate, which is not opposite to the light-emitting unit, is located outside the orthographic projection of the corresponding light-emitting unit on the substrate.

[0142] By setting the recessed portion 50 as an extension of the size of the groove 310, the light emitted by the edge region of the light-emitting unit 21 can be more incident to the recessed portion 50, so that more light is reflected at the surface of the recessed portion 50, and then emitted from the light-emitting surface of the display panel, thereby improving the front light-emitting efficiency of each light-emitting unit 21.

[0143] Optionally, the recessed depth of the recessed portion 50 is not greater than 5 μm. The recessed depth of the recessed portion 50 refers to the length of the recessed portion 50 recessed in a direction away from the center of the groove 310 in a direction parallel to the substrate.

[0144] By setting the recessed depth of the recessed portion 50 in the above range, the recessed depth of the recessed portion 50 can be set not too large, thereby reducing the amount of light directly incident to the first sub-layer 31 from the light-emitting unit 21, and reducing the light emitted toward the periphery of the display panel, so that the display panel emits light uniformly at each position.

[0145] In the embodiment of the present disclosure, the recessed depth of the recessed portion 50 can be 1 μm to 3 μm. For example, the recessed depth of the recessed portion 50 is 2 μm.

[0146] Exemplarily, as shown in Figure 14As shown in FIG. 1, the projection of the recess 50 on the bearing surface is a rectangle. The length of the rectangle is 1-2 μm, and the width of the rectangle, i.e., the recess depth H of the recess 50, is 1-3 μm.

[0147] Figure 15 FIG. 1 is a sectional view of a first sub-layer according to an embodiment of the present disclosure. Figure 15 FIG. 2 is a sectional view of the first sub-layer along the line B-B in FIG. 1. Figure 14 FIG. 3 is a sectional view of the first sub-layer along the line C-C in FIG. 1. Figure 13 As shown in FIG. 3, the side wall of the recess 310 can be an inclined surface, and correspondingly, the side wall where the long side of the rectangle is located can also be an inclined surface. The angle between the side wall of the recess 310 and the driving back plate 10 is equal to the angle between the side wall where the long side of the rectangle is located and the driving back plate 10.

[0148] As shown in FIG. 4, the side wall of the recess 310 is arranged to be parallel to the side wall of the recess 50 where the long side of the rectangle is located. In this way, the light obliquely incident on the side wall of the first sub-layer 31 and the light incident on the side wall where the long side of the rectangle is located will exit from the light exit surface of the display panel at the same exit angle. Figure 15 As shown in FIG. 5, the projection of the recess 50 on the bearing surface is a trapezoid. The length of the rectangle is 1-2 μm, and the height of the rectangle, i.e., the recess depth H of the recess 50, is 1-3 μm.

[0149] Figure 16 In the above implementation, the side wall of the recess 310 can be an inclined surface, and correspondingly, the side wall where the top side of the trapezoid is located can also be an inclined surface. The angle between the side wall of the recess 310 and the driving back plate 10 is equal to the angle between the side wall where the top side of the trapezoid is located and the driving back plate 10.

[0150] In this way, the side wall of the recess 310 is arranged to be parallel to the side wall where the top side of the trapezoid is located. In this way, the light obliquely incident on the side wall of the first sub-layer 31 and the light incident on the side wall where the top side of the trapezoid is located will exit from the light exit surface of the display panel at the same exit angle.

[0151] As shown in FIG. 6, the projection of the recess 50 on the bearing surface is a triangle. The triangle is an isosceles triangle, and the length of the base of the isosceles triangle is the same as the length of the side wall of the recess 310 in the direction parallel to the driving back plate 10. The distance from the fixed point of the isosceles triangle to the base, i.e., the recess depth H of the recess 50, is 1-3 μm.

[0152] As shown in FIG. 6, the projection of the recess 50 on the bearing surface is a triangle. The triangle is an isosceles triangle, and the length of the base of the isosceles triangle is the same as the length of the side wall of the recess 310 in the direction parallel to the driving back plate 10. The distance from the fixed point of the isosceles triangle to the base, i.e., the recess depth H of the recess 50, is 1-3 μm. Figure 17

[0153] ​​Compared with the case that the orthographic projection of the recessed portion 50 is a rectangle or a trapezoid, when the orthographic projection of the recessed portion 50 is a triangle, the area of the orthographic projection of the recessed portion 50 on the bearing surface is larger, and more light can be reflected at the surface of the recessed portion 50.

[0154] Optionally, only the recessed portion can be arranged on the side wall of the groove, that is, no protrusion is arranged on the side wall of the groove.

[0155] Figure 18 is a planar schematic diagram of a first sub-layer provided by an embodiment of the present disclosure. As shown in Figure 18 the side wall of the groove 310 has a recessed portion 50, the recessed portion 50 is recessed in a direction away from the geometric center of the groove 310, and the recessed portion 50 is located at least on the side of the first sub-layer 31 close to the light-emitting functional layer.

[0156] As shown in Figure 18 at least part of the orthographic projection of the recessed portion 50 on the bearing surface is located outside the orthographic projection of the corresponding light-emitting unit 21 on the substrate of the driving backboard 10.

[0157] In some implementations, the orthographic projection of the recessed portion on the substrate is completely located outside the orthographic projection of the corresponding light-emitting unit on the substrate.

[0158] In another implementation, a part of the recessed portion is opposite to the light-emitting unit, and the orthographic projection of another part of the recessed portion which is not opposite to the light-emitting unit on the substrate is located outside the orthographic projection of the corresponding light-emitting unit on the substrate.

[0159] By arranging the recessed portion 50, the size of the groove 310 is expanded, and the light emitted by the edge region of the light-emitting unit 21 can be more incident to the recessed portion 50, so that more light is reflected at the surface of the recessed portion 50, and then emitted from the light-emitting surface of the display panel, thereby improving the front light-emitting rate of each light-emitting unit 21.

[0160] Optionally, the recess depth H of the recessed portion 50 is not greater than 5 μm. The recess depth of the recessed portion 50 refers to the length of the recessed portion 50 recessed in a direction away from the center of the groove 310 in a direction parallel to the substrate.

[0161] By setting the recess depth of the recessed portion 50 in the above range, the recess depth of the recessed portion 50 can be prevented from being set too large, and the amount of light directly incident to the first sub-layer 31 from the light-emitting unit 21 is reduced, so that the light emitted toward the periphery of the display panel is reduced, and the display panel emits light uniformly at each position.

[0162] In the embodiment of the present disclosure, the recess depth H of the recessed portion 50 can be 1 μm to 3 μm. For example, the recess depth of the recessed portion 50 is 2 μm.

[0163] Optionally, the orthographic projection of the recess on the bearing surface can be a regular polygon, a circle, an ellipse, or an arbitrary irregular closed figure.

[0164] As shown in FIG. 5, the orthographic projection of the recess 50 on the bearing surface is a rectangle. The length of the rectangle is 1-2 μm, and the width of the rectangle, i.e., the recess depth H of the recess 50, is 1-3 μm. Figure 18

[0165] As shown in FIG. 6, the orthographic projection of the recess 50 on the bearing surface is a trapezoid. The length of the rectangle is 1-2 μm, and the height of the rectangle, i.e., the recess depth H of the recess 50, is 1-3 μm. Figure 19

[0166] In the above implementation, the side wall of the groove 310 can be an inclined surface, and correspondingly, the side wall where the top side of the trapezoid is located can also be an inclined surface. The angle between the side wall of the groove 310 and the driving back plate 10 is equal to the angle between the side wall where the top side of the trapezoid is located and the driving back plate 10.

[0167] In this way, the side wall of the groove 310 is parallel to the side wall where the top side of the trapezoid is located, so that the light rays obliquely incident on the side wall of the first sub-layer 31 and the light rays incident on the side wall where the top side of the trapezoid is located will be emitted from the light-emitting surface of the display panel at the same exit angle.

[0168] As shown in FIG. 7, the orthographic projection of the recess 50 on the bearing surface is a triangle. The triangle is an isosceles triangle, and in the direction parallel to the driving back plate 10, the length of the base of the isosceles triangle is the same as the length of the side wall of the groove 310. The distance from the fixed point of the isosceles triangle to the base, i.e., the recess depth H of the recess 50, is 1-3 μm. Figure 20 Compared with the orthographic projection of the recess 50 being a rectangle or a trapezoid, when the orthographic projection of the recess 50 is a triangle, the area of the orthographic projection of the recess 50 on the bearing surface is larger, and more light rays can be reflected at the surface of the recess 50.

[0169] In the above implementation, the orthographic projection of the outer contour of the recess on the bearing surface is the same as the range defined by the opening of the pixel definition layer 23.

[0170] In other implementations, as shown in FIG. 8, the outer contour of the orthographic projection of the groove 310 on the bearing surface is located outside the orthographic projection of the light-emitting unit 21 on the bearing surface. The width K of the groove 310 is greater than the opening length of the pixel definition layer.

[0171] Figure 21 In other implementations, as shown in FIG. 8, the outer contour of the orthographic projection of the groove 310 on the bearing surface is located outside the orthographic projection of the light-emitting unit 21 on the bearing surface. The width K of the groove 310 is greater than the opening length of the pixel definition layer. ​​

[0172] In some other implementations, as shown in FIG. 4, the side walls of part of the grooves 310 are provided with recesses 50, and the side walls of the other part of the grooves 310 are not provided with the recesses 50. In the premise that a sufficient number of recesses are provided to allow more light to be reflected at the surface of the recesses 50 and improve the front light extraction efficiency of the light-emitting unit 21, the recesses can not be provided in part of the grooves to prevent the problem of light mixing between the light-emitting units. Figure 22

[0173] Figure 23 FIG. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the present disclosure. As shown in FIG. 1, the display panel comprises a light-emitting functional layer 20, a light extraction layer 30, and a packaging layer 22. The light-emitting functional layer 20 and the light extraction layer 30 are sequentially stacked between the packaging layer 22 and a driving backplane (not shown in the figure). Figure 23 As shown in FIG. 1, the display panel further comprises a touch layer 60 and the packaging layer 22 and the touch layer 60 are sequentially stacked between the light-emitting functional layer 20 and the light extraction layer 30, and the first sub-layer 31 and the second sub-layer 32 are sequentially stacked on the touch layer 60.

[0174] In some implementations of the present disclosure, the touch layer 60 comprises a plurality of touch units and a plurality of touch lines. The plurality of touch units are arrayed on the packaging layer 22, and the plurality of touch lines are located on the packaging layer 22. The touch lines are connected to at least one touch unit, and the touch lines are used to electrically connect the connected touch units to a touch integrated circuit.

[0175] Exemplarily, the touch unit can be a transparent conductive layer, for example, the transparent conductive layer can be an ITO (Indium tin oxide) layer and an IZO (Indium Zinc Oxide) layer.

[0176] Exemplarily, the touch unit can be a metal mesh structure. The metal mesh structure is formed by interlacing metal wires and has a network shape. The touch unit of this structure is a touch layer in the FMLOC (Flexible Multi-Layer On Cell) technology.

[0177] Since the metal mesh structure is a metal wire, in order to avoid the metal mesh structure from blocking the light emitted by the light-emitting unit 21, the metal mesh structure can be distributed in a manner of surrounding the light-emitting unit 21 to ensure the display effect of the display substrate.

[0178] Figure 24 FIG. 6 is a flowchart of a preparation method of a display panel according to an embodiment of the present disclosure. As shown in FIG. 6, the preparation method comprises the following steps. Figure 16

[0179] Step S1: providing a driving backplane.

[0180] The driving backplane can comprise a substrate and a plurality of driving circuits. The plurality of driving circuits are arrayed on the substrate. ​​

[0181] In this embodiment of the disclosure, the driving backplane can be a TFT substrate, and each driving circuit on the driving backplane includes at least two TFTs.

[0182] Step S2: Form a light-emitting functional layer on the bearing surface of the drive backplate.

[0183] The light-emitting functional layer includes multiple light-emitting units arranged in an array.

[0184] Optionally, before step S3, the process may further include: forming an encapsulation layer on the light-emitting functional layer, and then forming a touch layer on the encapsulation layer.

[0185] Step S3: Form a light extraction layer on the light-emitting functional layer.

[0186] If a touch layer is formed in the aforementioned steps, then the light extraction layer formed in step S3 is located on the touch layer.

[0187] like Figure 2 As shown, the light extraction layer 30 includes a first sub-layer 31 and a second sub-layer 32, which are sequentially stacked on the light-emitting functional layer 20. The refractive index of the first sub-layer 31 is lower than that of the second sub-layer 32. The first sub-layer 31 has multiple grooves 310, with one groove 310 opposite to one light-emitting unit 21. A portion of the second sub-layer 32 is located within the grooves 310.

[0188] At least a portion of the outer contour of the orthographic projection of the groove 310 onto the bearing surface is located within the orthographic projection of the corresponding light-emitting unit 21 onto the bearing surface.

[0189] In this embodiment of the disclosure, the sidewall of the groove may have a protrusion, and the orthographic projection of the protrusion on the substrate of the driving back plate is located within the orthographic projection of the light-emitting unit on the substrate of the driving back plate.

[0190] The number and shape of the protrusions, as well as the positional relationship between the protrusions and the grooves, can be found in the preceding text. Figures 1 to 11 Illustrated embodiment.

[0191] This disclosure provides a display device, which includes a display panel as described above and a power supply component, wherein the power supply component is electrically connected to the display panel. The power supply component may be a power source, etc.

[0192] The display device can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0193] The above is not any form of restriction on the present disclosure, although the present disclosure has been disclosed as above by examples, however, not to limit the present disclosure, any skilled person in the art, without departing from the technical solution range of the present disclosure, can make some more changes or modifications as equivalent embodiments of equivalent changes by using the above disclosed technical content, but as long as it does not deviate from the technical solution of the present disclosure, according to the technical essence of the present disclosure, any simple modification, equivalent change and modification of the above examples, still belongs to the range of the technical solution of the present disclosure.

Claims

1. A display panel, characterized by, The display panel comprises a driving back plate (10), a light-emitting functional layer (20) and a light extraction layer (30), the light-emitting functional layer (20) and the light extraction layer (30) are sequentially located on a bearing surface of the driving back plate (10); The light-emitting functional layer (20) comprises a plurality of light-emitting units (21) arranged in an array; The light extraction layer (30) comprises a first sub-layer (31) and a second sub-layer (32), the first sub-layer (31) and the second sub-layer (32) are sequentially laminated on the light-emitting functional layer (20), the refractive index of the first sub-layer (31) is lower than the refractive index of the second sub-layer (32), the first sub-layer (31) has a plurality of grooves (310), each groove (310) in the plurality of grooves is opposite to a light-emitting unit (21) in the plurality of light-emitting units (21), and part of the second sub-layer (32) is located in the plurality of grooves (310); At least part of the outer contour of the orthographic projection of the groove (310) on the bearing surface is located in the orthographic projection of the corresponding light-emitting unit (21) on the bearing surface; The sidewall of at least one groove (310) in the plurality of grooves (310) has a protrusion (40), the orthographic projection of the protrusion (40) on the bearing surface is located in the orthographic projection of the light-emitting unit (21) on the bearing surface, part of the surface of the protrusion (40) is coplanar with the side surface of the first sub-layer (31) close to the light-emitting unit (21), the outer wall surface of the protrusion (40) is a conical surface, one end of the protrusion (40) with a larger size is coplanar with the side surface of the first sub-layer (31) close to the light-emitting unit (21), and the cross section of the protrusion (40) parallel to the bearing surface is semicircular; The sidewall of the groove (310) is a circular arc surface, and the sidewall of the groove (310) is recessed in a direction away from the center of the groove (310); or the sidewall of the groove (310) is a circular arc surface, and the sidewall of the groove (310) is protruded in a direction towards the center of the groove (310); The sidewall of the groove (310) has a recessed part (50), the recessed part (50) is recessed in a direction away from the geometric center of the groove (310), and the recessed part (50) is located at least at the side surface of the first sub-layer (31) close to the light-emitting functional layer (20); at least part of the orthographic projection of the recessed part (50) on the bearing surface is located outside the orthographic projection of the corresponding light-emitting unit (21) on the bearing surface; The orthographic projection of the recessed part (50) on the bearing surface is rectangular, the sidewall of the groove (310) is an inclined surface, the sidewall of the recessed part (50) on the bearing surface is an inclined surface, and the inclination angle between the sidewall of the groove (310) and the driving back plate (10) is equal to the inclination angle between the sidewall of the recessed part (50) on the bearing surface and the driving back plate (10); or, A projection of the recess (50) on the bearing surface is a trapezoid, a side wall of the groove (310) is an inclined surface, a side wall where a top side of the projection of the recess (50) on the bearing surface is located is an inclined surface, and an included angle between the side wall of the groove (310) and the driving back plate (10) is equal to an included angle between the side wall where the top side of the projection of the recess (50) on the bearing surface is located and the driving back plate (10). In the plurality of grooves (310), a side wall of a part of the grooves (310) is provided with the recess (50), and a side wall of another part of the grooves (310) is not provided with the recess (50).

2. The display panel of claim 1, wherein, A maximum height of the protrusion (40) is 1 μm to 3 μm, and a maximum width of the protrusion (40) is 1 μm to 5 μm.

3. The display panel of claim 1, wherein, An outer wall surface of the protrusion (40) is a cylindrical surface, and a straight generatrix of the cylindrical surface is parallel to the side wall of the groove (310).

4. The display panel of any one of claims 1 to 3, wherein, The protrusion (40) is provided in a plurality of forms, and the plurality of protrusions (40) are distributed at intervals around the geometric center of the groove (310).

5. The display panel of claim 4, wherein, The groove (310) has a plurality of side walls connected in sequence and end to end, and each side wall of the groove (310) has at most one protrusion (40).

6. The display panel of any one of claims 1 to 3, wherein, The protrusion (40) is in a frame shape, and a geometric center of the protrusion (40) is the same as a geometric center of the groove (310).

7. The display panel of claim 1, wherein, A recess depth of the recess (50) is not greater than 5 μm.

8. The display panel of any of claims 1 to 3, 5, 7, wherein, The groove (310) has a first opening (311) and a second opening (312), the first opening (311) is located on a side of the first sub-layer (31) close to the driving back plate (10), the second opening (312) is located on a side of the first sub-layer (31) away from the driving back plate (10), and a projection of the first opening (311) on the bearing surface is located in a projection of the second opening (312) on the bearing surface.

9. The display panel of claim 8, wherein, An included angle between the side wall of the groove (310) and the driving back plate (10) is 40° to 80°.

10. The display panel of claim 8, wherein, The side wall of the groove (310) includes a plurality of planes connected in sequence between the first opening (311) and the second opening (312), and the two connected planes have an included angle therebetween.

11. The display panel of claim 8, wherein, The side wall of the groove (310) is a curved surface, and the side wall of the groove (310) is recessed in a direction away from the center of the groove (310). 12.The display panel of any one of claims 1-3, 5, 7, 9-11, wherein, The groove (310) corresponds to the light-emitting unit (21) in one-to-one correspondence.

13. The display panel of any of claims 1-3, 5, 7, 9-11, wherein, The first sub-layer (31) is a transparent optical material layer or an ink material layer, and the second sub-layer (32) is a transparent optical material layer or an ink material layer. 14.The display panel of any one of claims 1-3, 5, 7, 9-11, wherein, The display panel further comprises a touch layer (60) and an encapsulation layer (22), the encapsulation layer (22) and the touch layer (60) are sequentially stacked between the light-emitting functional layer (20) and the light extraction layer (30), and the first sub-layer (31) and the second sub-layer (32) are sequentially stacked on the touch layer (60).

15. A method for manufacturing a display panel, characterized by, The preparation method comprises: providing a driving back plate; Form a light-emitting functional layer on the carrying surface of the driving backplane, the light-emitting functional layer comprising a plurality of light-emitting units arranged in an array; Form a light extraction layer on the light-emitting functional layer, the light extraction layer comprising a first sub-layer and a second sub-layer, the first sub-layer and the second sub-layer being stacked in sequence on the light-emitting functional layer, the first sub-layer having a refractive index lower than that of the second sub-layer, the first sub-layer having a plurality of grooves, each groove of the plurality of grooves being opposite to a light-emitting unit of the plurality of light-emitting units, part of the second sub-layer being located within the plurality of grooves; at least part of the outer contour of the orthographic projection of the groove on the carrying surface is located within the orthographic projection of the corresponding light-emitting unit on the carrying surface; The sidewall of at least one groove of the plurality of grooves has a protrusion, the orthographic projection of the protrusion on the carrying surface being located within the orthographic projection of the light-emitting unit on the carrying surface; part of the surface of the protrusion is coplanar with the side of the first sub-layer close to the light-emitting unit; the outer wall surface of the protrusion is a conical surface, one end of the protrusion with a larger size is coplanar with the side of the first sub-layer close to the light-emitting unit, and the cross section of the protrusion parallel to the carrying surface is semicircular; The sidewall of the groove is a circular arc surface, and the sidewall of the groove is recessed in a direction away from the center of the groove; or, the sidewall of the groove is a circular arc surface, and the sidewall of the groove is protruded in a direction towards the center of the groove; The sidewall of the groove has a recessed portion, the recessed portion is recessed in a direction away from the geometric center of the groove, and the recessed portion is located at least on the side of the first sub-layer close to the light-emitting functional layer; at least part of the orthographic projection of the recessed portion on the carrying surface is located outside the orthographic projection of the corresponding light-emitting unit on the carrying surface; The orthographic projection of the recessed portion on the carrying surface is rectangular, the sidewall of the groove is an inclined surface, the sidewall on which the long side of the orthographic projection of the recessed portion on the carrying surface is located is an inclined surface, and the inclination angle between the sidewall of the groove and the driving backplane is equal to the inclination angle between the sidewall on which the long side of the orthographic projection of the recessed portion on the carrying surface is located and the driving backplane; or, The orthographic projection of the recessed portion on the carrying surface is trapezoidal, the sidewall of the groove is an inclined surface, the sidewall on which the top side of the orthographic projection of the recessed portion on the carrying surface is located is an inclined surface, and the inclination angle between the sidewall of the groove and the driving backplane is equal to the inclination angle between the sidewall on which the top side of the orthographic projection of the recessed portion on the carrying surface is located and the driving backplane; In the plurality of grooves, the sidewall of a part of the grooves is provided with the recessed portion, and the sidewall of another part of the grooves is not provided with the recessed portion.

16. A display device comprising: The display device comprises a power supply assembly and a display panel as claimed in any one of claims 1 to 14, the power supply assembly being electrically connected with the display panel.

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