Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device. The display panel includes: a substrate; the pixel limiting structure is located on one side of the substrate, a plurality of first openings are formed in the pixel limiting structure, and the pixel limiting structure comprises side walls on the peripheral sides of the first openings; the reflecting layer covers at least part of the side wall; the light-emitting functional layer is at least partially located in the first opening; the first electrode layer is located on the side, away from the substrate, of the light-emitting functional layer; the color filter structure is located on the side, away from the substrate, of the first electrode layer and fills the first opening, and the orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflecting layer on the substrate. The first opening is filled with the color filter structure, the color filter structure covers the reflecting layer, almost all light rays reflected by the surface, deviating from the substrate, of the color filter structure can be reflected by the reflecting layer, the angle of the light rays is changed, then the light rays are emitted out of the color filter structure again, and the light extraction rate of the display panel is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a method for preparing the same, and a display device. Background Art

[0002] In display devices, an organic light emitting diode (OLED) device is a device that uses a multi-layer organic thin film structure to generate electroluminescence, and has the advantages of light weight, high brightness, low power consumption, fast response, and wide viewing angle. With the widespread application of OLED devices, the display requirements for OLED devices are getting higher and higher. However, there are still some problems with the display of OLED devices. Summary of the invention

[0003] In view of this, embodiments of the present application provide a display panel, a method for manufacturing the same, and a display device.

[0004] In a first aspect, the present application provides a display panel, comprising:

[0005] substrate;

[0006] A pixel defining structure is located on one side of the substrate, the pixel defining structure is provided with a plurality of first openings, and the pixel defining structure includes side walls around the first openings;

[0007] a reflective layer covering at least a portion of the side wall;

[0008] The light-emitting functional layer is at least partially located in the first opening;

[0009] A first electrode layer, located on a side of the light-emitting functional layer away from the substrate;

[0010] The color filter structure is located on a side of the first electrode layer away from the substrate and is filled in the first opening. The orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflective layer on the substrate.

[0011] In one embodiment, it further includes: a first encapsulation layer, located between the first electrode layer and the color filter structure, the refractive index of the first encapsulation layer being less than or equal to the refractive index of the color filter structure;

[0012] Preferably, the refractive index of the first encapsulation layer is 1.75 to 1.85, and the refractive index of the color filter structure is 1.83 to 2.0;

[0014] Preferably, the material of the color filter structure includes organic material and / or inorganic material;

[0015] Preferably, the organic material comprises acrylic and / or epoxy resin;

[0016] Preferably, the inorganic material comprises silicon nitride, silicon oxide and / or zirconium oxide;

[0017] Preferably, the material of the first encapsulation layer includes at least one of silicon nitride, silicon oxide or silicon oxynitride;

[0018] Preferably, it further comprises: a second encapsulation layer, located on a side of the color filter structure away from the substrate, wherein the refractive index of the second encapsulation layer is smaller than the refractive index of the color filter structure;

[0019] Preferably, the refractive index of the second encapsulation layer is 1.4 to 1.6;

[0020] Preferably, the second encapsulation layer comprises at least one of an organic material and an inorganic material;

[0021] Preferably, the second encapsulation layer has a porous structure;

[0022] Preferably, the second encapsulation layer comprises polyimide and hollow silica;

[0023] Preferably, it further comprises: a light adjustment layer, located between the color filter structure and the second encapsulation layer, wherein the refractive index of the light adjustment layer is smaller than the refractive index of the color filter structure;

[0024] Preferably, the material of the light adjustment layer includes hollow silica and / or LiF;

[0025] Preferably, the refractive index of the light adjustment layer is 1.1 to 1.45.

[0026] In one embodiment, it further comprises: a black matrix located on a side of the first electrode layer away from the substrate, wherein the orthographic projection of the color filter structure on the substrate is connected to or partially overlaps with the orthographic projection of the black matrix on the substrate;

[0027] Preferably, the distance between the surface of the color filter structure facing away from the substrate and the substrate is greater than or equal to the distance between the surface of the black matrix facing away from the substrate and the substrate.

[0028] In one embodiment, it further includes: a first encapsulation layer, located between the first electrode layer and the color filter structure, the refractive index of the first encapsulation layer being less than or equal to the refractive index of the color filter structure;

[0029] Preferably, it further comprises: a third encapsulation layer, located on a side of the first encapsulation layer facing away from the substrate;

[0030] Preferably, the black matrix is ​​located on a side of the first encapsulation layer facing away from the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate; or, the black matrix is ​​located on a side of the third encapsulation layer facing away from the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate.

[0031] In one embodiment, it further includes: a first encapsulation layer, located on a side of the color filter structure facing away from the substrate;

[0032] Preferably, the refractive index of the first encapsulation layer is 1.75 to 1.85, and the refractive index of the color filter structure is 1.8 to 1.9;

[0033] Preferably, the material of the color filter structure includes organic material and / or inorganic material;

[0034] Preferably, the organic material comprises acrylic and / or epoxy resin;

[0035] Preferably, the inorganic material comprises silicon nitride, silicon oxide and / or zirconium oxide;

[0036] Preferably, the material of the first encapsulation layer includes at least one of silicon nitride, silicon oxide or silicon oxynitride;

[0037] Preferably, it further comprises: a second encapsulation layer, located on a side of the first encapsulation layer away from the substrate, wherein the refractive index of the second encapsulation layer is smaller than the refractive index of the first encapsulation layer;

[0038] Preferably, the refractive index of the second encapsulation layer is 1.4 to 1.6;

[0039] Preferably, the second encapsulation layer comprises at least one of an organic material and an inorganic material;

[0040] Preferably, the second encapsulation layer has a porous structure;

[0041] Preferably, the second encapsulation layer comprises polyimide and hollow silica;

[0042] Preferably, it further comprises: a light adjustment layer, located between the first encapsulation layer and the second encapsulation layer, wherein the refractive index of the light adjustment layer is smaller than the refractive index of the first encapsulation layer;

[0043] Preferably, the material of the light adjustment layer includes hollow silica and / or LiF;

[0044] Preferably, the refractive index of the light adjustment layer is 1.1 to 1.45.

[0045] In one embodiment, it further includes: a first encapsulation layer, located on a side of the color filter structure facing away from the substrate;

[0046] Preferably, it further comprises: a third encapsulation layer, located on a side of the first encapsulation layer facing away from the substrate;

[0047] Preferably, the black matrix is ​​located on a side of the first packaging layer close to the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate; or, the black matrix is ​​located on a side of the third packaging layer away from the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate.

[0048] In one embodiment, along a direction perpendicular to the plane where the substrate is located, the thickness of the color filter structure is 2 μm to 3 μm;

[0049] Preferably, the depth of the first opening is 1 μm to 2 μm;

[0050] Preferably, the size of the first opening gradually increases along a direction away from the substrate;

[0051] Preferably, the orthographic projection of the first opening on the substrate is located within the orthographic projection range of the color filter structure on the substrate;

[0052] Preferably, the surface of the color filter structure facing away from the substrate is parallel to the plane where the substrate is located.

[0053] In one embodiment, the reflective layer includes a first conductive layer, a second conductive layer and a third conductive layer which are stacked in sequence;

[0054] Preferably, the first conductive layer comprises indium tin oxide, the second conductive layer comprises silver, and the third conductive layer comprises indium tin oxide;

[0055] Preferably, the thickness of the first conductive layer is 8 nm to 12 nm, the thickness of the second conductive layer is 90 nm to 110 nm, and the thickness of the third conductive layer is 8 nm to 12 nm;

[0056] Preferably, the display panel further comprises: an insulating layer, located on a side of the reflective layer away from the side wall, the insulating layer at least covering the reflective layer on a side of the side wall away from the substrate;

[0057] Preferably, the insulating layer is provided with a second opening, and the orthographic projection of the second opening on the substrate is located within the orthographic projection range of the first opening on the substrate;

[0058] Preferably, the material of the insulating layer includes organic material and / or inorganic material;

[0059] Preferably, the refractive index of the organic material is 1.5 to 1.6, and the refractive index of the inorganic material is 1.80 to 2.0;

[0060] Preferably, the organic material comprises photosensitive polyimide; the inorganic material comprises at least one of silicon nitride, silicon oxide and silicon oxynitride;

[0061] Preferably, the material of the insulating layer includes an organic material, and the thickness of the insulating layer is 1 μm to 1.5 μm, and / or the material of the insulating layer includes an inorganic material, and the thickness of the insulating layer is 150 nm to 500 nm.

[0062] In one embodiment, the side wall has a first end disposed close to the substrate and a second end disposed away from the substrate, and the side wall includes a plurality of first protrusions;

[0063] Preferably, in the direction from the first end to the second end, the plurality of first protrusions are arranged in sequence;

[0064] Preferably, the angle between the line connecting the first end and the second end and the plane where the substrate is located is 20° to 50°;

[0065] Preferably, along a direction parallel to the plane where the substrate is located, the distance between the first end and the second end is 3 μm to 5 μm;

[0066] Preferably, along a direction perpendicular to the plane where the substrate is located, the cross-sectional shape of the first protrusion includes a first arc shape, and the opening of the first arc shape faces away from the reflective layer;

[0067] Preferably, a line connecting the midpoints of the plurality of first arcs forms a second arc, and an opening of the second arc faces away from the reflective layer;

[0068] Preferably, the reflective layer includes a plurality of second protrusions, and the second protrusions are arranged corresponding to the first protrusions; preferably, the insulating layer includes a plurality of third protrusions, and the third protrusions are arranged corresponding to the second protrusions.

[0069] In one embodiment, the pixel defining structure comprises a planarization layer;

[0070] Preferably, the thickness of the planar layer is 1.6 μm to 4 μm;

[0071] Preferably, the reflective layer is electrically conductive.

[0072] In one embodiment, the pixel defining structure includes a planar layer and a pixel defining layer, the planar layer is located on a side of the pixel defining layer close to the substrate, and the first opening is located in the pixel defining layer;

[0073] Preferably, the thickness of the pixel defining layer is 2 μm to 3 μm;

[0074] Preferably, the display panel further comprises: a second electrode layer, located between the planar layer and the pixel defining layer, wherein a portion of the second electrode layer is exposed in the first opening;

[0075] Preferably, the reflective layer is conductive and contacts the second electrode layer.

[0076] In one embodiment, the color filter structure includes a red filter structure, a green filter structure and a blue filter structure.

[0077] A second aspect of the present application provides a display panel, including:

[0078] substrate;

[0079] A pixel defining structure is located on one side of the substrate, the pixel defining structure is provided with a plurality of first openings, and the pixel defining structure includes side walls around the first openings;

[0080] a reflective layer covering at least a portion of the side wall;

[0081] A light-emitting device, part of which is located in the first opening, the light-emitting device comprises a light-emitting functional layer, and the light-emitting functional layer is located on a side of the reflective layer away from the substrate;

[0082] The color filter structure is located on the side of the light emitting device away from the substrate. The orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflective layer on the substrate, and the surface of the color filter structure away from the substrate is parallel to the plane where the substrate is located.

[0083] In one embodiment, along a direction perpendicular to the plane where the substrate is located, the thickness of the color filter structure is 2 μm to 3 μm;

[0084] Preferably, the depth of the first opening is 1 μm to 2 μm;

[0085] Preferably, the size of the first opening gradually increases along a direction away from the substrate;

[0086] Preferably, the orthographic projection of the first opening on the substrate is located within the orthographic projection range of the color filter structure on the substrate.

[0087] In one embodiment, the pixel defining structure comprises a planarization layer;

[0088] Preferably, the thickness of the planar layer is 1.6 μm to 4 μm;

[0089] Preferably, the reflective layer is electrically conductive.

[0090] In one embodiment, the pixel defining structure includes a planar layer and a pixel defining layer, the planar layer is located on a side of the pixel defining layer close to the substrate, and the first opening is located in the pixel defining layer;

[0091] Preferably, the thickness of the pixel defining layer is 2 μm to 3 μm;

[0092] Preferably, the light emitting device comprises: a second electrode layer located between the planar layer and the pixel defining layer, wherein a portion of the second electrode layer is exposed in the first opening;

[0093] Preferably, the reflective layer is conductive and contacts the second electrode layer.

[0094] In one embodiment, the side wall has a first end disposed close to the substrate and a second end disposed away from the substrate, and an angle between a line connecting the first end and the second end and a plane where the substrate is located is 20° to 50°;

[0095] Preferably, along a direction parallel to the plane where the substrate is located, the distance between the first end and the second end is 3 μm to 5 μm.

[0096] A third aspect of the present application provides a method for preparing a display panel, comprising:

[0097] A pixel defining material layer is prepared on one side of the substrate, and a plurality of first openings are opened in the pixel defining material layer using a halftone process to obtain a pixel defining structure, wherein the pixel defining structure includes a side wall around the first opening;

[0098] preparing a reflective layer covering at least a portion of the sidewall;

[0099] preparing a light-emitting functional layer at least partially located in the first opening;

[0100] Prepare a first electrode layer on the side of the light-emitting functional layer facing away from the substrate;

[0101] A color filter structure filled in the first opening is prepared on a side of the first electrode layer facing away from the substrate, and the orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflective layer on the substrate.

[0102] In one embodiment, the step of preparing a color filter structure filled in the first opening on a side of the first electrode layer facing away from the substrate includes:

[0103] A black matrix is ​​prepared on a side of the first electrode layer facing away from the substrate, wherein the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate;

[0104] Filling the first opening with a color filter material, and the color filter material fills at least a portion of the space surrounded by the black matrix, to obtain a color filter structure;

[0105] Preferably, after the step of preparing the reflective layer covering at least a portion of the side wall and before the step of preparing the light-emitting functional layer at least partially located in the first opening, the method further comprises:

[0106] An insulating layer is prepared on the side of the reflective layer facing away from the side wall, and the insulating layer at least covers the reflective layer on the side of the side wall facing away from the substrate.

[0107] A fourth aspect of the present application provides a display device, comprising the aforementioned display panel, or comprising a display panel prepared by the aforementioned preparation method.

[0108] According to the display panel provided by the embodiment of the present application, the refractive index of the color filter structure is relatively high, and the large-angle light emitted by the light-emitting functional layer is reflected after passing through the color filter structure. The reflected light enters the reflective layer and is reflected, thereby changing the angle of the light, so that the large-angle light becomes a small-angle light, and the small-angle light can be smoothly emitted, thereby improving the light extraction efficiency; the setting position of the color filter structure of the embodiment of the present application is conducive to reducing the reflection of the color filter structure on the ambient light, improving the transmittance and color purity of the display panel, improving the display quality of the display panel, and having an excellent effect on improving color deviation; in addition, the color filter structure fills the first opening and at least partially covers the reflective layer, and the light reflected by the surface of the color filter structure away from the substrate can almost all be reflected by the reflective layer and then emitted from the color filter structure again after the angle is changed, thereby improving the light extraction efficiency of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0109] Figure 1 This is a schematic diagram of the structure of a display panel in one embodiment of the present application.

[0110] Figure 2 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0111] Figure 3 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0112] Figure 4 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0113] Figure 5 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0114] Figure 6 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0115] Figure 7 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0116] Figure 8 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0117] Fig. 9 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0118] Fig.10 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0119] Fig.11 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0120] Fig.12 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0121] Fig.13 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0122] Fig.14 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0123] Fig.15 for Fig.14 A schematic diagram of an enlarged structure of the display panel at A.

[0124] Fig.16 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0125] Fig.17 The figure is a schematic flow chart of a method for preparing a display panel in one embodiment of the present application. DETAILED DESCRIPTION

[0126] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0127] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0128] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0129] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0130] In display panels, large-angle outgoing light is often bounded by total reflection at the interface of the stacked film layers, which increases light loss, affects the light extraction efficiency of the device, and causes a significant increase in the power consumption of the screen. For example, the encapsulation layer of the display panel includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer that are stacked, wherein the first inorganic encapsulation layer generally uses a high-refractive material, and the organic encapsulation layer generally uses a low-refractive material. At the interface between the first inorganic encapsulation layer and the organic encapsulation layer, large-angle outgoing light often undergoes total reflection, causing most of the light to be constrained in a waveguide mode due to total reflection. Therefore, it is crucial for display devices to improve the original light-emitting optical path through reasonable structural design so that as much light as possible can be extracted.

[0131] In view of this, the first aspect of the present application provides a display panel, referring to Figure 1 The structural schematic diagram of the display panel shown in the figure, the display panel includes: a substrate 100; a pixel defining structure 200, which is located on one side of the substrate 100, and the pixel defining structure 200 is provided with a plurality of first openings 210, and the pixel defining structure 200 includes a sidewall 212 around the first opening 210; a reflective layer 300, which covers at least a portion of the sidewall 212; a light-emitting functional layer 400, which is at least partially located in the first opening 210; a first electrode layer 500, which is located on a side of the light-emitting functional layer 400 away from the substrate 100; a color filter structure 600, which is located on a side of the first electrode layer 500 away from the substrate 100 and filled in the first opening 210, and the orthographic projection of the color filter structure 600 on the substrate 100 at least partially covers the orthographic projection of the reflective layer 300 on the substrate 100.

[0132] According to the display panel provided by the embodiment of the present application, the refractive index of the color filter structure 600 is relatively high, and the large-angle light emitted by the light-emitting functional layer 400 is reflected after passing through the color filter structure 600. The reflected light enters the reflective layer 300 and is reflected, thereby changing the angle of the light, so that the large-angle light becomes a small-angle light, and the small-angle light can be smoothly emitted, thereby improving the light extraction efficiency; the setting position of the color filter structure 600 in the embodiment of the present application is conducive to reducing the reflection of the color filter structure 600 on the ambient light, improving the display quality of the display panel, and having an excellent effect of improving the color deviation; in addition, the color filter structure 600 is filled in the first opening 210 and at least partially covers the reflective layer 300. After the light is reflected by the surface of the color filter structure 600 away from the substrate 100, almost all of the light can be reflected by the reflective layer 300 and then emitted from the color filter structure 600 again after the angle is changed, thereby improving the light extraction efficiency of the display panel.

[0133] In one embodiment, referring to Figure 2The structural diagram of the display panel shown in the figure, the display panel further includes: a first encapsulation layer 700, located between the first electrode layer 500 and the color filter structure 600, and the refractive index of the first encapsulation layer 700 is less than or equal to the refractive index of the color filter structure 600. Therefore, the first encapsulation layer 700 can improve the encapsulation effect and improve the yield of the display panel; moreover, the large-angle light emitted from the light-emitting functional layer 400 can smoothly enter the color filter structure 600 to avoid light loss.

[0134] In one embodiment, the refractive index of the first encapsulation layer 700 is 1.75-1.85, for example, 1.75, 1.77, 1.79, 1.80, 1.82, 1.84 or 1.85, etc., and the refractive index of the color filter structure 600 is 1.83-2.0, for example, 1.83, 1.84, 1.86, 1.88, 1.90, 1.92, 1.94, 1.96, 1.98 or 2.0, etc. Thus, the refractive index of the first encapsulation layer 700 and the color filter structure 600 is not much different, and the large-angle light emitted from the light-emitting functional layer 400 can smoothly enter the color filter structure 600 to avoid light loss.

[0135] In one embodiment, the material of the color filter structure 600 includes organic material and / or inorganic material; the organic material includes acrylic and / or epoxy resin; the inorganic material includes silicon nitride, silicon oxide and / or zirconium oxide. Therefore, the refractive index of the color filter structure 600 can be within the range of 1.83 to 2.0.

[0136] Exemplarily, the material of the first encapsulation layer 700 includes at least one of silicon nitride, silicon oxide or silicon oxynitride. The first encapsulation layer 700 has a better encapsulation effect.

[0137] In one embodiment, referring to Figure 3 The structural diagram of the display panel shown in the figure, the display panel further includes: a second encapsulation layer 800, which is located on the side of the color filter structure 600 away from the substrate 100, and the refractive index of the second encapsulation layer 800 is less than the refractive index of the color filter structure 600. Therefore, at the interface between the second encapsulation layer 800 and the color filter structure 600, the outgoing light with a large angle can be totally reflected, and the light after the total reflection is reflected by the reflective layer 300, and the light angle is changed to become a small angle light, which is smoothly emitted from the second encapsulation layer 800, thereby improving the light extraction efficiency of the display panel.

[0138] Exemplarily, the first encapsulation layer 700 is an inorganic encapsulation layer, and the second encapsulation layer 800 is an organic encapsulation layer. If there is no color filter structure 600, large-angle light will be totally reflected at the interface between the first encapsulation layer 700 and the second encapsulation layer 800, resulting in the inability of large-angle light to be emitted. It can be understood that the setting of the color filter structure 600 allows large-angle reflected light to be reflected through the reflective layer to change the light path and enhance the light extraction efficiency.

[0139] In one embodiment, the refractive index of the second encapsulation layer 800 is 1.4 to 1.6, for example, 1.4, 1.45, 1.5, 1.55 or 1.6, etc. Therefore, the refractive index of the second encapsulation layer 800 is relatively matched with the refractive index of the color filter structure 600, and at the interface between the second encapsulation layer 800 and the color filter structure 600, the outgoing light with a large angle can be totally reflected, and the light after total reflection is reflected by the reflective layer 300, and the light angle is changed to a small angle light, which is smoothly emitted from the second encapsulation layer 800, thereby improving the light extraction efficiency of the display panel.

[0140] Exemplarily, the second encapsulation layer 800 includes at least one of an organic material and an inorganic material.

[0141] In one embodiment, the second encapsulation layer 800 includes a porous structure, which is beneficial to reducing the refractive index of the second encapsulation layer 800, so that large-angle light at the interface between the second encapsulation layer 800 and the color filter structure 600 is more likely to be totally reflected, thereby avoiding light loss.

[0142] Exemplarily, the second encapsulation layer 800 includes polyimide and hollow silica. Thus, the addition of hollow silica is conducive to reducing the refractive index of the second encapsulation layer 800, so that the large-angle light at the interface between the second encapsulation layer 800 and the color filter structure 600 is more likely to be totally reflected, thereby avoiding light loss.

[0143] It is understood that hollow silica refers to silica particles whose shell is mainly composed of silica and whose interior is hollow.

[0144] Exemplarily, the second encapsulation layer 800 includes polyimide and hollow silica. When manufacturing the second encapsulation layer 800, the polyimide and hollow silica are mixed and formed on the side of the color filter structure 600 away from the substrate 100 by inkjet printing (IJP), and the second encapsulation layer 800 is obtained after curing.

[0145] In one embodiment, referring to Figure 4The structural diagram of the display panel shown in the figure, the display panel also includes: a light adjustment layer 900, located between the color filter structure 600 and the second encapsulation layer 800, and the refractive index of the light adjustment layer 900 is less than the refractive index of the color filter structure 600. Optionally, the refractive index of the light adjustment layer 900 is 1.1 to 1.45, for example, it can be 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4 or 1.45. Therefore, the refractive index of the light adjustment layer 900 is relatively low, so that the light at a large angle at the interface of the light adjustment layer 900 and the color filter structure 600 is more likely to be totally reflected, thereby avoiding light loss.

[0146] In one embodiment, the material of the light adjustment layer 900 includes hollow silica and / or LiF. Therefore, the refractive index of the light adjustment layer 900 having the above materials is relatively low, so that the light at a large angle at the interface between the light adjustment layer 900 and the color filter structure 600 is more likely to be totally reflected, thereby avoiding light loss.

[0147] In one embodiment, referring to Figure 5 The structural diagram of the display panel shown in the figure further includes: a third encapsulation layer 1000, which is located on the side of the second encapsulation layer 800 away from the substrate 100. Therefore, the encapsulation effect of the display panel is excellent, which is conducive to preventing water vapor from invading the light-emitting functional layer.

[0148] In one embodiment, referring to Figure 6 The structure diagram of the display panel shown in FIG. 1 further includes: a black matrix 1100, which is located on the side of the first electrode layer 500 away from the substrate 100, and the orthographic projection of the color filter structure 600 on the substrate 100 is connected to or partially overlapped with the orthographic projection of the black matrix 1100 on the substrate 100. This helps to improve the color purity. In a specific embodiment, refer to Figure 6 The structure diagram of the display panel shown in FIG. 1 further includes: a black matrix 1100, the black matrix 1100 is located on the side of the first encapsulation layer 700 away from the substrate 100, and the orthographic projection of the black matrix 1100 on the substrate 100 surrounds the orthographic projection of the first opening 210 on the substrate 100. In another specific embodiment, referring to Figure 7 In the structural diagram of the display panel shown in the figure, the black matrix 1100 is located on the side of the third encapsulation layer 1000 away from the substrate 100, and the orthographic projection of the black matrix 1100 on the substrate 100 surrounds the orthographic projection of the first opening 210 on the substrate 100. It can be understood that the color filter structure 600 is filled in the first opening 210, and the corresponding black matrix 1100 has a more flexible expansion distance, which can reduce the reflectivity of the screen without affecting the accelerated brightness attenuation of the product at a large viewing angle and improving the product transmittance and light color purity, which is conducive to saving polarizers.

[0149] In one embodiment, the orthographic projection of the first opening 210 on the substrate 100 is located within the orthographic projection range of the color filter structure 600 on the substrate 100. Thus, almost all of the large-angle light emitted from the first opening 210 can be reflected by the color filter structure 600, and then reflected by the reflective layer 300 to become small-angle light, thereby improving the light extraction efficiency.

[0150] In one embodiment, the orthographic projection of the color filter structure 600 on the substrate 100 is connected to or partially overlapped with the orthographic projection of the black matrix 1100 on the substrate 100. This helps to avoid crosstalk between the light emitted by the adjacent color filter structures 600 and improve color purity; the black matrix 1100 can also absorb ambient light, reduce the reflection of the display panel to the ambient light, and improve the display quality of the display panel.

[0151] In one embodiment, the black matrix 1100 is located on the side of the first encapsulation layer 700 away from the substrate 100, and the distance from the surface of the color filter structure 600 away from the substrate 100 to the substrate 100 is greater than or equal to the distance from the surface of the black matrix 1100 away from the substrate 100 to the substrate 100. It can be understood that the material of the color filter structure 600 includes an organic material. In the process of preparing the color filter structure 600 and the black matrix 1100, the black matrix 1100 is first prepared, and then the color filter structure 600 is prepared at the position of the corresponding color filter structure 600 defined by the black matrix 1100, which is conducive to the color filter structure 600 filling the gap defined by the black matrix 1100, thereby improving the yield of the display panel; and because the color filter structure 600 is an organic material, after curing, the distance from the surface of the color filter structure 600 away from the substrate 100 to the substrate 100 is greater than or equal to the distance from the surface of the black matrix 1100 away from the substrate 100 to the substrate 100. The schematic diagram of the distance between the surface of the color filter structure 600 facing away from the substrate 100 and the substrate 100 is equal to the distance between the surface of the black matrix 1100 facing away from the substrate 100 and the substrate 100 can be referred to. Figure 6 , the distance between the surface of the color filter structure 600 facing away from the substrate 100 and the substrate 100 is greater than the distance between the surface of the black matrix 1100 facing away from the substrate 100 and the substrate 100 (not shown).

[0152] Exemplarily, the optical path diagram of large-angle light is shown in S1. The light emitted from the light-emitting functional layer 400 is totally reflected at the interface between the color filter structure 600 and the light adjustment layer 900. The light after total reflection passes through the first packaging layer 700, the first electrode layer 500 and the light-emitting functional layer 400, and is incident on the surface of the reflective layer 300 and is reflected. The reflected light is changed in angle to become small-angle light, and enters the color filter structure 600 after passing through the light-emitting functional layer 400, the first electrode layer 500 and the first packaging layer 700. The small-angle light will not be totally reflected at the interface between the color filter structure 600 and the light adjustment layer 900, but will be emitted from the light adjustment layer 900, and then emitted from the display panel, thereby improving the light extraction rate of the display panel and improving the display quality of the display panel.

[0153] Exemplarily, the optical path diagram of large-angle light is shown in S2. After the light emitted from the light-emitting functional layer 400 passes through the color filter structure 600, it enters the light adjustment layer 900 at a larger angle, and is totally reflected at the interface between the light adjustment layer 900 and the second packaging layer 800. The light after total reflection passes through the light adjustment layer 900, the first packaging layer 700, the first electrode layer 500 and the light-emitting functional layer 400, and is incident on the surface of the reflective layer 300 and is reflected. The reflected light is changed in angle to become small-angle light, and enters the second packaging layer 800 after passing through the light-emitting functional layer 400, the first electrode layer 500, the first packaging layer 700 and the light adjustment layer 900. The small-angle light will not be totally reflected at the interface between the light adjustment layer 900 and the second packaging layer 800, but will be emitted from the second packaging layer 800, and then emitted from the display panel, thereby improving the light extraction rate of the display panel and improving the display quality of the display panel.

[0154] In one embodiment, referring to Figure 8 In the structural diagram of the display panel shown in FIG. 1 , the first encapsulation layer 700 is located on the side of the color filter structure 600 away from the substrate 100. Thus, the large-angle light emitted from the light-emitting functional layer 500 can smoothly enter the first encapsulation layer 700 from the color filter structure 600, avoiding light loss.

[0155] In one embodiment, the refractive index of the first encapsulation layer 700 is 1.75-1.85, for example, 1.75, 1.77, 1.79, 1.80, 1.82, 1.84 or 1.85, etc., and the refractive index of the color filter structure 600 is 1.8-1.9, for example, 1.8, 1.82, 1.84, 1.86, 1.88 or 1.9, etc. Thus, the refractive index of the first encapsulation layer 700 and the color filter structure 600 are not much different, and the large-angle light emitted from the light-emitting functional layer 400 can smoothly enter the color filter structure 600 to avoid light loss.

[0156] In one embodiment, the material of the color filter structure 600 includes organic material and / or inorganic material; the organic material includes acrylic and / or epoxy resin; the inorganic material includes silicon nitride, silicon oxide and / or zirconium oxide. Therefore, the refractive index of the color filter structure 600 can be within the range of 1.8 to 1.9.

[0157] Exemplarily, the material of the first encapsulation layer includes at least one of silicon nitride, silicon oxide, or silicon oxynitride.

[0158] In one embodiment, referring to Fig. 9 The structural diagram of the display panel shown in the figure, the display panel further includes: a second encapsulation layer 800, which is located on the side of the first encapsulation layer 700 away from the substrate 100, and the refractive index of the second encapsulation layer 800 is less than the refractive index of the first encapsulation layer 700. Therefore, at the interface between the second encapsulation layer 800 and the first encapsulation layer 700, the outgoing light with a large angle is totally reflected, and the light after the total reflection is reflected by the reflective layer 300, and the light angle is changed to become a small angle light, which is smoothly emitted from the second encapsulation layer 800, thereby improving the light extraction efficiency of the display panel.

[0159] In one embodiment, the refractive index of the second encapsulation layer 800 is 1.4 to 1.6. Therefore, the refractive index of the second encapsulation layer 800 is relatively matched with the refractive index of the first encapsulation layer 700. At the interface between the second encapsulation layer 800 and the first encapsulation layer 700, the outgoing light with a large angle is totally reflected. After the total reflection, the light is reflected by the reflective layer 300, and the light angle is changed to a small angle light, which is smoothly emitted from the second encapsulation layer 800, thereby improving the light extraction efficiency of the display panel. Moreover, under the coordinated effect of the refractive index between the first encapsulation layer 700 and the second encapsulation layer 800, the total reflection of the light at the interface between the second encapsulation layer 800 and the first encapsulation layer 700 can be reduced, and most of the light can be smoothly emitted, and only the outgoing light with a large angle is totally reflected.

[0160] Exemplarily, the second encapsulation layer 800 includes at least one of an organic material and an inorganic material.

[0161] In one embodiment, the second encapsulation layer 800 has a porous structure, which helps to reduce the refractive index of the second encapsulation layer 800, and the outgoing light with a large angle is more likely to be totally reflected, thereby helping to improve the light extraction rate of the display panel.

[0162] In one embodiment, the second encapsulation layer 800 includes polyimide and hollow silica. Therefore, the addition of hollow silica is conducive to reducing the refractive index of the second encapsulation layer 800, so that the large-angle light at the interface between the second encapsulation layer 800 and the first encapsulation layer 700 is more likely to be totally reflected, thereby avoiding light loss.

[0163] In one embodiment, referring to Fig.10 The structural schematic diagram of the display panel shown in the figure, the display panel also includes: a light adjustment layer 900, located between the first encapsulation layer 700 and the second encapsulation layer 800, and the refractive index of the light adjustment layer 900 is less than the refractive index of the first encapsulation layer 700. Optionally, the refractive index of the light adjustment layer 900 is 1.1-1.45. As a result, the refractive index of the light adjustment layer 900 is relatively low, so that the light at a large angle at the interface between the light adjustment layer 900 and the first encapsulation layer 700 is more likely to be totally reflected, thereby avoiding light loss.

[0164] In one embodiment, the material of the light adjustment layer 900 includes hollow silica and / or LiF. Therefore, the refractive index of the light adjustment layer 900 having the above materials is relatively low, so that the light at a large angle at the interface between the light adjustment layer 900 and the first encapsulation layer 700 is more likely to be totally reflected, thereby avoiding light loss.

[0165] Exemplarily, the method for preparing the light adjustment layer 900 includes, but is not limited to, doping hollow SiO 2 into an organic material and preparing the light adjustment layer 900 using a printing process.

[0166] In one embodiment, referring to Fig.11 The structural diagram of the display panel shown in the figure further includes: a third encapsulation layer 1000, which is located on the side of the second encapsulation layer 800 away from the substrate 100. Therefore, the encapsulation effect of the display panel is excellent, which is conducive to preventing water vapor from invading the light-emitting functional layer.

[0167] Exemplarily, the first encapsulation layer 700 and the third encapsulation layer 1000 are formed by deposition (CVD) or the like. The second encapsulation layer 800 is formed by inkjet printing (IJP).

[0168] In a specific embodiment, referring to Fig.12 The structural diagram of the display panel shown in FIG. 1 further includes: a black matrix 1100, the black matrix 1100 is located on the side of the first encapsulation layer 700 close to the substrate 100, and the orthographic projection of the black matrix 1100 on the substrate 100 surrounds the orthographic projection of the first opening 210 on the substrate 100. This facilitates the emission of light with a wide viewing angle, and further facilitates the wide viewing angle display of the display panel. In another specific embodiment, referring to Fig.14 In the structural diagram of the display panel shown in FIG. 1 , the black matrix 1100 is located on the side of the third encapsulation layer 1000 away from the substrate 100, and the orthographic projection of the black matrix 1100 on the substrate 100 surrounds the orthographic projection of the first opening 210 on the substrate 100. Thus, the arrangement of the black matrix 1100 is conducive to reducing the risk of crosstalk of light emitted from adjacent first openings 210, and improving the color purity of the display panel; at the same time, the black matrix 1100 can absorb ambient light, reduce the reflection of ambient light by the display panel, and improve the display quality.

[0169] In one embodiment, the orthographic projection of the first opening 210 on the substrate 100 is located within the orthographic projection range of the color filter structure 600 on the substrate 100. Thus, almost all of the large-angle light emitted from the first opening 210 can be reflected by the color filter structure 600, and then reflected by the reflective layer 300 to become small-angle light, thereby improving the light extraction efficiency.

[0170] In one embodiment, the orthographic projection of the color filter structure 600 on the substrate 100 is connected to or partially overlapped with the orthographic projection of the black matrix 1100 on the substrate 100 .

[0171] It is understandable that, referring to Fig.13 As shown in the structural diagram of the display panel, the color filter structure 600 includes a red filter structure 601, a green filter structure 602 and a blue filter structure 603, etc., which can improve the color purity of the light emitted by the display panel and improve the display quality of the display panel.

[0172] In a specific embodiment, the black matrix 1100 is located on a side of the first encapsulation layer 700 close to the substrate 100, and the distance from the surface of the color filter structure 600 away from the substrate 100 to the substrate 100 is greater than or equal to the distance from the surface of the black matrix 1100 away from the substrate 100 to the substrate 100.

[0173] In one embodiment, along a direction perpendicular to the plane where the substrate 100 is located, the thickness of the color filter structure 600 is 2 μm to 3 μm, for example, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm or 3 μm, etc. Thus, the color filter structure 600 is conducive to completely filling the first opening 210, and is conducive to fully reflecting the large-angle light and then changing the exit angle of the large-angle light, thereby improving the light extraction efficiency of the display panel.

[0174] In one embodiment, the depth of the first opening 210 is 1 μm to 2 μm, for example, 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm or 2 μm, etc. Thus, the first opening 210 has an appropriate depth, which is beneficial to the preparation of the first opening 210. After the color filter structure 600 is filled into the first opening 210, it is beneficial to fully reflect the large-angle light and then change the exit angle of the large-angle light, thereby improving the light extraction efficiency of the display panel.

[0175] Exemplarily, the size of the first opening 210 gradually increases along a direction away from the substrate 100 .

[0176] It can be understood that after the color filter structure 600 is filled into the first opening 210 , the surface of the color filter structure 600 facing away from the substrate 100 is parallel to the plane where the substrate 100 is located.

[0177] In one embodiment, referring to Fig.15 As shown in the partial enlarged structural diagram of the first opening, the side wall 212 has a first end 2121 disposed close to the substrate 100 and a second end 2122 disposed away from the substrate 100, and the side wall 212 includes a plurality of first protrusions 2123, and the plurality of first protrusions 2123 are sequentially arranged in the direction from the first end 2121 to the second end 2122. In one embodiment, the reflective layer 300 includes a plurality of second protrusions 310, and the second protrusions 310 are disposed corresponding to the first protrusions 2123. It can be understood that the second protrusion 310 and the first protrusion 2123 are arranged correspondingly, which means that any second protrusion 310 has the same structure as the corresponding first protrusion 2123, and the second protrusion 310 has the same trend as the corresponding first protrusion 2123; illustratively, the thickness of the reflective layer 300 is uniform, and the reflective layer 300 is arranged on the side wall 212, and the reflective layer 300 extends in contact with the side wall 212, so that the structure of the reflective layer 300 is the same as that of the side wall 212. Therefore, the second protrusion 310 of the reflective layer 300 is more conducive to changing the angle of the large-angle light incident on the reflective layer 300, and is more conducive to improving the light extraction efficiency of the display panel.

[0178] In one embodiment, the angle α between the line connecting the first end 2121 and the second end 2122 and the plane where the substrate 100 is located is 20° to 50°, for example, 20°, 30°, 32°, 34°, 36°, 38° or 40°, etc. Thus, it is beneficial to lengthen the length of the side wall 212, and to adjust more large-angle light directions to converge to small-angle directions that are easy to emit, thereby further improving the light extraction efficiency of the display panel.

[0179] In one embodiment, along a direction parallel to the plane where the substrate 100 is located, the distance between the first end 2121 and the second end 2122 is 3μm to 5μm, for example, 3μm, 3.5μm, 4μm, 4.5μm or 5μm, etc.; thereby, it is beneficial to lengthen the length of the side wall 212, and to adjust more large-angle light directions to converge to small-angle directions that are easy to emit, thereby further improving the light extraction efficiency of the display panel.

[0180] In one embodiment, referring to Fig.15 , along a direction perpendicular to the plane where the substrate 100 is located, the cross-sectional shape of the first protrusion 2123 includes a first arc 1 , and the opening of the first arc 1 faces away from the reflective layer 300 .

[0181] In one embodiment, the midpoints of the plurality of first arcs 1 are connected to form a second arc 2, and the opening of the second arc 2 faces away from the reflective layer 300. This is beneficial to lengthen the length of the side wall 212, and to adjust more large-angle light directions to converge to small-angle directions that are easy to emit, further improving the light extraction efficiency of the display panel. It should be noted that Fig.15 In the figure, the second arc 2 is a line connecting the midpoints of multiple first arcs 1, and is not an actual line. The use of a dotted line to represent the second arc 2 is only used to explain the present application and cannot be understood as a limitation to the present application.

[0182] In one embodiment, the reflective layer includes a first conductive layer, a second conductive layer and a third conductive layer stacked in sequence; optionally, the first conductive layer includes indium tin oxide, the second conductive layer includes silver, and the third conductive layer includes indium tin oxide. Thus, the reflective layer has excellent conductive and reflective effects.

[0183] In one embodiment, the thickness of the first conductive layer is 8nm to 12nm (for example, 8nm, 9nm, 10nm, 11nm or 12nm, etc.), the thickness of the second conductive layer is 90nm to 110nm (for example, 90nm, 95nm, 100nm, 105nm or 110nm, etc.), and the thickness of the third conductive layer is 8nm to 12nm (for example, 8nm, 9nm, 10nm, 11nm or 12nm, etc.).

[0184] In one embodiment, referring to Fig.14 The structural diagram of the display panel shown in the figure further includes: an insulating layer 1200, which is located on the side of the reflective layer 300 away from the side wall 212, and the insulating layer 1200 at least covers the reflective layer 300 on the side of the side wall 212 away from the substrate 100. Therefore, when part of the light-emitting functional layer 400 is located on the side wall 212, the light emitted by the light-emitting functional layer 400 located on the side wall 212 can be prevented from being emitted, thereby reducing defects such as light crosstalk, which is conducive to improving the display quality of the display panel.

[0185] In one embodiment, the insulating layer 1200 is provided with a second opening 1220, and the orthographic projection of the second opening 1220 on the substrate 100 is located within the orthographic projection range of the first opening 210 on the substrate 100. Exemplarily, the insulating layer 1200 is located between the reflective layer 300 and the light-emitting functional layer 400, and the insulating layer 1200 at least covers the reflective layer 300 on the sidewall 212, and the insulating layer 1200 is not provided at the bottom of the first opening 210 and at least part of the side of the pixel definition structure 200 away from the substrate 100, so that the pixel light-emitting area is limited, and the risk of screen splitting caused by the discharge of gas in the film structure is reduced.

[0186] In one embodiment, referring to Fig.15, the insulating layer 1200 includes a plurality of third protrusions 1210, and the third protrusions 1210 are arranged correspondingly to the second protrusions 310. It can be understood that the corresponding arrangement of the third protrusions 1210 and the second protrusions 310 means that any third protrusion 1210 has the same structure as the corresponding second protrusion 310, and the third protrusion 1210 has the same trend as the corresponding second protrusion 310; illustratively, the thickness of the insulating layer 1200 is uniform, and the insulating layer 1200 is arranged on the surface of the reflective layer 300, and the insulating layer 1200 extends in contact with the reflective layer 300, so that the structure of the insulating layer 1200 is the same as that of the reflective layer 300. Therefore, the arrangement of the insulating layer 1200 is conducive to the propagation of light in a direction close to a straight line, and the traveling direction of the light is almost not changed.

[0187] In one embodiment, the material of the insulating layer includes organic material and / or inorganic material.

[0188] In one embodiment, the refractive index of the organic material is 1.5 to 1.6 (for example, it can be 1.5, 1.52, 1.54, 1.56, 1.58 or 1.6, etc.), and the refractive index of the inorganic material is 1.80 to 2.0 (for example, it can be 1.80, 1.85, 1.9, 1.95 or 2.0, etc.); illustratively, the material of the insulating layer includes an organic material, and the thickness of the insulating layer is 1 μm to 1.5 μm (for example, it can be 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm or 1.5 μm, etc.), and / or, the material of the insulating layer includes an inorganic material, and the thickness of the insulating layer is 150 nm to 500 nm (for example, it can be 150 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm or 500 nm, etc.). Therefore, the thickness of the insulating layer 1200 is relatively thin, which is conducive to the propagation of light in a direction close to a straight line and hardly changes the traveling direction of the light.

[0189] In one embodiment, the organic material includes an organic glue, such as photosensitive polyimide, etc.; the inorganic material includes at least one of silicon nitride, silicon oxide and silicon oxynitride.

[0190] In one embodiment, referring to Figure 1 , the pixel defining structure 200 includes a planar layer 220. Therefore, directly using the planar layer 220 as the pixel defining structure 200 is beneficial to saving film layer structures and simplifying the manufacturing process.

[0191] In one embodiment, the thickness of the planar layer 220 is 1.6 μm to 4 μm, for example, 1.6 μm, 1.8 μm, 2 μm, 3 μm or 4 μm, etc. Therefore, the thickness of the planar layer 220 is appropriate, which is conducive to the emission of light with a large viewing angle, thereby improving the light extraction rate of the display panel.

[0192] In one embodiment, the reflective layer 300 is conductive. In this case, the reflective layer 300 can be used as an electrode to excite the light-emitting functional layer 400 to emit light. Exemplarily, the reflective layer 300 is laid at the bottom of the first opening 210 and at least covers the side wall 212, which is conducive to converting more large-angle light into small-angle light, and the small-angle light can be smoothly emitted, thereby improving the light extraction efficiency; at the same time, the reflective layer 300 is not laid on the entire surface, which reduces the risk of screen splitting caused by the discharge of gas in the film structure, and is conducive to improving the transmittance of the display panel, and can take into account the effect of reflecting large-angle light, thereby improving the light extraction efficiency of the display panel.

[0193] In one embodiment, referring to Fig.16 As shown in the structural schematic diagram of the display panel, the pixel defining structure 200 includes a planar layer 220 and a pixel defining layer 230, the planar layer 220 is located on the side of the pixel defining layer 230 close to the substrate 100, and the first opening 210 is located in the pixel defining layer 230. Optionally, the display panel further includes: a second electrode layer 240, located between the planar layer 220 and the pixel defining layer 230, the second electrode layer 240 is partially exposed in the first opening 210, and the reflective layer 300 is conductive and in contact with the second electrode layer 240. Exemplarily, the second electrode layer 240 can be electrically connected to the driving circuit.

[0194] Exemplarily, the material of the second electrode layer includes but is not limited to indium tin oxide (ITO) and the like.

[0195] In one embodiment, the thickness of the pixel defining layer 230 is 2 μm to 3 μm, for example, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm or 3 μm, etc. Therefore, the thickness of the pixel defining layer 230 is appropriate, which is conducive to the emission of light with a large viewing angle, thereby improving the light extraction rate of the display panel.

[0196] Exemplarily, the display panel further includes a cover plate located on a side of the third encapsulation layer facing away from the substrate.

[0197] Exemplarily, the light-emitting functional layer includes a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a light-emitting layer (EML), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL) which are stacked in sequence. The hole injection layer is located on a side of the hole transport layer close to the reflective layer, or the electron injection layer is located on a side of the electron transport layer close to the reflective layer.

[0198] In some embodiments, the substrate may be a glass-based substrate. In some embodiments, the substrate may include an organic resin material such as epoxy resin, triazine, silicone resin or polyimide. Exemplarily, there is a pixel circuit between the substrate and the pixel defining structure 200, and the substrate and the pixel circuit constitute an array substrate. For example, the array substrate may be a FR4 type printed circuit board (Printed circuit board, PCB), or may be a flexible PCB that is easily deformed. In some embodiments, the array substrate may include a ceramic material such as silicon nitride, aluminum nitride or aluminum oxide, or include a metal or a metal compound. For example, the array substrate may be a metal core printed circuit board (Metal Core PCB, MCPCB) or a metal copper clad laminate (Metal Copper Clad Laminate, MCCL).

[0199] A second aspect of the present application provides a display panel, referring to Figure 1 The display panel includes: a substrate 100; a pixel defining structure 200, which is located on one side of the substrate 100, the pixel defining structure 200 includes a plurality of first openings 210, and the pixel defining structure 200 includes a sidewall 212 around the first opening 210; a reflective layer 300, which covers at least a portion of the sidewall 212; a light-emitting device 1300, wherein a portion of the light-emitting device 1300 is located in the first opening 210, the light-emitting device 1300 includes a light-emitting functional layer 400, and the light-emitting functional layer 400 is located on a side of the reflective layer 300 away from the substrate 100; a color filter structure 600, which is located on a side of the light-emitting device 1300 away from the substrate 100, the orthographic projection of the color filter structure 600 on the substrate 100 at least partially covers the orthographic projection of the reflective layer 300 on the substrate 100, and the surface of the color filter structure 600 away from the substrate 100 is parallel to the plane where the substrate 100 is located.

[0200] It should be noted that the display panel of this embodiment can be combined with the display panel described above in whole or in part, which will not be described in detail here.

[0201] In one embodiment, along a direction perpendicular to the plane where the substrate 100 is located, the thickness of the color filter structure 600 is 2 μm to 3 μm, for example, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm or 3 μm, etc. Thus, the color filter structure 600 is conducive to completely filling the first opening 210, and is conducive to fully reflecting the large-angle light and then changing the exit angle of the large-angle light, thereby improving the light extraction efficiency of the display panel.

[0202] In one embodiment, the depth of the first opening 210 is 1 μm to 2 μm, for example, 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm or 2 μm, etc. Thus, the first opening 210 has an appropriate depth, which is beneficial to the preparation of the first opening 210. After the color filter structure 600 is filled into the first opening 210, it is beneficial to fully reflect the large-angle light and then change the exit angle of the large-angle light, thereby improving the light extraction efficiency of the display panel.

[0203] Exemplarily, the size of the first opening 210 gradually increases along a direction away from the substrate 100 .

[0204] In one embodiment, the orthographic projection of the first opening 210 on the substrate 100 is located within the orthographic projection range of the color filter structure 600 on the substrate 100. Thus, almost all of the large-angle light emitted from the first opening 210 can be reflected by the color filter structure 600, and then reflected by the reflective layer 300 to become small-angle light, thereby improving the light extraction efficiency.

[0205] In one embodiment, referring to Figure 1 , the pixel defining structure 200 includes a planar layer 220. Therefore, directly using the planar layer 220 as the pixel defining structure 200 is beneficial to saving film layer structures and simplifying the manufacturing process.

[0206] In one embodiment, the thickness of the planar layer 220 is 1.6 μm to 4 μm, for example, 1.6 μm, 1.8 μm, 2 μm, 3 μm or 4 μm, etc. Therefore, the thickness of the planar layer 220 is appropriate, which is conducive to the emission of light with a large viewing angle, thereby improving the light extraction rate of the display panel.

[0207] In one embodiment, the reflective layer 300 is conductive. In this case, the reflective layer 300 can be used as an electrode to excite the light-emitting functional layer 400 to emit light. Exemplarily, the reflective layer 300 is laid at the bottom of the first opening 210 and at least covers the side wall 212, which is conducive to converting more large-angle light into small-angle light, and the small-angle light can be smoothly emitted, thereby improving the light extraction efficiency; at the same time, the reflective layer 300 is not laid on the entire surface, which reduces the risk of screen splitting caused by the discharge of gas in the film structure, and is conducive to improving the transmittance of the display panel, and can take into account the effect of reflecting large-angle light, thereby improving the light extraction efficiency of the display panel.

[0208] In one embodiment, referring to Fig.16 As shown in the structural schematic diagram of the display panel, the pixel defining structure 200 includes a planar layer 220 and a pixel defining layer 230, the planar layer 220 is located on the side of the pixel defining layer 230 close to the substrate 100, and the first opening 210 is located in the pixel defining layer 230. Optionally, the display panel further includes: a second electrode layer 240, located between the planar layer 220 and the pixel defining layer 230, the second electrode layer 240 is partially exposed in the first opening 210, and the reflective layer 300 is conductive and in contact with the second electrode layer 240. Exemplarily, the second electrode layer 240 can be electrically connected to the driving circuit.

[0209] Exemplarily, the material of the second electrode layer includes but is not limited to indium tin oxide (ITO) and the like.

[0210] In one embodiment, the thickness of the pixel defining layer 230 is 2 μm to 3 μm, for example, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm or 3 μm, etc. Therefore, the thickness of the pixel defining layer 230 is appropriate, which is conducive to the emission of light with a large viewing angle, thereby improving the light extraction rate of the display panel.

[0211] In one embodiment, referring to Fig.15 The schematic diagram of the partial enlarged structure of the first opening shown in the figure shows that the side wall 212 has a first end 2121 disposed close to the substrate 100 and a second end 2122 disposed away from the substrate 100, and the angle α between the line connecting the first end 2121 and the second end 2122 and the plane where the substrate 100 is located is 20° to 50°, for example, it can be 20°, 30°, 32°, 34°, 36°, 38° or 40°, etc. Therefore, it is beneficial to lengthen the length of the side wall 212, and it is beneficial to adjust more large-angle light directions to converge to small-angle directions that are easy to emit, and further improve the light extraction efficiency of the display panel.

[0212] In one embodiment, along a direction parallel to the plane where the substrate 100 is located, the distance between the first end 2121 and the second end 2122 is 3μm to 5μm, for example, 3μm, 3.5μm, 4μm, 4.5μm or 5μm, etc.; thereby, it is beneficial to lengthen the length of the side wall 212, and to adjust more large-angle light directions to converge to small-angle directions that are easy to emit, thereby further improving the light extraction efficiency of the display panel.

[0213] A third aspect of the present application provides a method for preparing a display panel, referring to Fig.17 The schematic flow chart of the method for preparing a display panel is shown, and the method for preparing a display panel includes the following steps.

[0214] S100: preparing a pixel defining material layer on one side of the substrate, and opening a plurality of first openings in the pixel defining material layer using a halftone process to obtain a pixel defining structure, wherein the pixel defining structure includes side walls around the first openings.

[0215] It should be noted that the pixel defining structure and the first opening are consistent with the above description and will not be described in detail here.

[0216] S200: preparing a reflective layer covering at least a portion of the side wall.

[0217] It should be noted that the reflective layer is consistent with the previous description and will not be elaborated here.

[0218] S300: preparing a light-emitting functional layer at least partially located in the first opening.

[0219] Illustratively, after the step of preparing a reflective layer covering at least a portion of the side wall and before the step of preparing a light-emitting functional layer at least partially located in the first opening, the method further includes: preparing an insulating layer on the side of the reflective layer facing away from the side wall, wherein the insulating layer at least covers the reflective layer on the side of the side wall facing away from the substrate. Illustratively, the insulating material can be prepared on the entire surface first, and then the insulating layer can be etched.

[0220] It should be noted that the light-emitting functional layer and the insulating layer are consistent with the above description and will not be elaborated herein.

[0221] S400: preparing a first electrode layer on the side of the light-emitting functional layer facing away from the substrate.

[0222] It should be noted that the first electrode layer is consistent with the above description, and will not be described in detail here. Exemplarily, the first electrode layer can be prepared by full-surface evaporation.

[0223] S500: preparing a color filter structure filled in the first opening on a side of the first electrode layer facing away from the substrate, wherein the orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflective layer on the substrate.

[0224] It should be noted that the color filter structure is consistent with the above description and will not be described in detail here.

[0225] In one embodiment, preparing a color filter structure filled in the first opening on a side of the first electrode layer facing away from the substrate includes: preparing a black matrix on a side of the first electrode layer facing away from the substrate, the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate; filling the first opening with a color filter material, and the color filter material fills the space enclosed by the black matrix to obtain a color filter structure.

[0226] Illustratively, before preparing the color filter structure filled in the first opening on the side of the first electrode layer facing away from the substrate, the method further includes: preparing a first encapsulation layer on the side of the first electrode layer facing away from the substrate.

[0227] Illustratively, after preparing a color filter structure filled in the first opening on the side of the first electrode layer facing away from the substrate, the method further includes: sequentially preparing a second encapsulation layer and a third encapsulation layer on the side of the color filter structure facing away from the substrate, and attaching a cover plate on the side of the third encapsulation layer facing away from the substrate.

[0228] Illustratively, after preparing a color filter structure filled in the first opening on the side of the first electrode layer facing away from the substrate, and before preparing a second encapsulation layer on the side of the color filter structure facing away from the substrate, the method further includes: preparing a light adjustment layer on the side of the color filter structure facing away from the substrate.

[0229] It should be noted that the display panel prepared by the preparation method in this embodiment can be combined with the display panel described above in whole or in part, and will not be described in detail here.

[0230] A fourth aspect of the present application provides a display device, comprising the above-mentioned display panel, or comprising a display panel prepared by the above-mentioned preparation method.

[0231] It should be noted that, in addition to the display panel described above, the display device may also include structures that a conventional display device should have, such as a touch panel, a driver chip, a housing, etc., which will not be elaborated here.

[0232] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0233] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A display panel, characterized in that: include: substrate; A pixel defining structure, located on one side of the substrate, wherein the pixel defining structure is provided with a plurality of first openings, and the pixel defining structure includes side walls around the first openings; a reflective layer, covering at least a portion of the side wall; A light-emitting functional layer, at least partly located in the first opening; A first electrode layer, located on a side of the light-emitting functional layer away from the substrate; The color filter structure is located on a side of the first electrode layer away from the substrate and is filled in the first opening. The orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflective layer on the substrate.

2. The display panel according to claim 1, characterized in that: Also includes: A first packaging layer, located between the first electrode layer and the color filter structure, wherein the refractive index of the first packaging layer is less than or equal to the refractive index of the color filter structure; Preferably, the refractive index of the first encapsulation layer is 1.75 to 1.85, and the refractive index of the color filter structure is 1.83 to 2.0; Preferably, the material of the color filter structure includes organic material and / or inorganic material; Preferably, the organic material comprises acrylic and / or epoxy resin; Preferably, the inorganic material comprises silicon nitride, silicon oxide and / or zirconium oxide; Preferably, the material of the first encapsulation layer includes at least one of silicon nitride, silicon oxide or silicon oxynitride; Preferably, it further comprises: a second encapsulation layer, located on a side of the color filter structure away from the substrate, wherein the refractive index of the second encapsulation layer is smaller than the refractive index of the color filter structure; Preferably, the refractive index of the second encapsulation layer is 1.4 to 1.6; Preferably, the second encapsulation layer comprises at least one of an organic material and an inorganic material; Preferably, the second encapsulation layer has a porous structure; Preferably, the second encapsulation layer comprises polyimide and hollow silica; Preferably, it further comprises: a light adjustment layer, located between the color filter structure and the second encapsulation layer, the refractive index of the light adjustment layer being smaller than the refractive index of the color filter structure; Preferably, the material of the light adjustment layer includes hollow silica and / or LiF; Preferably, the refractive index of the light adjustment layer is 1.1-1.

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3. The display panel according to claim 1, characterized in that: Also includes: a black matrix, located on a side of the first electrode layer away from the substrate, wherein an orthographic projection of the color filter structure on the substrate is connected to or partially overlaps with an orthographic projection of the black matrix on the substrate; Preferably, the distance between the surface of the color filter structure facing away from the substrate and the substrate is greater than or equal to the distance between the surface of the black matrix facing away from the substrate and the substrate.

4. The display panel according to claim 3, characterized in that: Also includes: A first packaging layer, located between the first electrode layer and the color filter structure, wherein the refractive index of the first packaging layer is less than or equal to the refractive index of the color filter structure; Preferably, it further comprises: a third encapsulation layer, located on a side of the first encapsulation layer away from the substrate; Preferably, the black matrix is ​​located on a side of the first encapsulation layer facing away from the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate; or, the black matrix is ​​located on a side of the third encapsulation layer facing away from the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate.

5. The display panel according to claim 1, characterized in that: Also includes: A first encapsulation layer is located on a side of the color filter structure away from the substrate; Preferably, the refractive index of the first encapsulation layer is 1.75 to 1.85, and the refractive index of the color filter structure is 1.8 to 1.9; Preferably, the material of the color filter structure includes organic material and / or inorganic material; Preferably, the organic material comprises acrylic and / or epoxy resin; Preferably, the inorganic material comprises silicon nitride, silicon oxide and / or zirconium oxide; Preferably, the material of the first encapsulation layer includes at least one of silicon nitride, silicon oxide or silicon oxynitride; Preferably, it further comprises: a second encapsulation layer, located on a side of the first encapsulation layer away from the substrate, wherein the refractive index of the second encapsulation layer is smaller than the refractive index of the first encapsulation layer; Preferably, the refractive index of the second encapsulation layer is 1.4 to 1.6; Preferably, the second encapsulation layer comprises at least one of an organic material and an inorganic material; Preferably, the second encapsulation layer has a porous structure; Preferably, the second encapsulation layer comprises polyimide and hollow silica; Preferably, it further comprises: a light adjustment layer, located between the first encapsulation layer and the second encapsulation layer, wherein the refractive index of the light adjustment layer is smaller than the refractive index of the first encapsulation layer; Preferably, the material of the light adjustment layer includes hollow silica and / or LiF; Preferably, the refractive index of the light adjustment layer is 1.1-1.

45.

6. The display panel according to claim 3, characterized in that: Also includes: A first encapsulation layer is located on a side of the color filter structure away from the substrate; Preferably, it further comprises: a third encapsulation layer, located on a side of the first encapsulation layer away from the substrate; Preferably, the black matrix is ​​located on a side of the first encapsulation layer close to the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate; or, the black matrix is ​​located on a side of the third encapsulation layer away from the substrate, and the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate.

7. The display panel according to any one of claims 1 to 6, characterized in that: Along the direction perpendicular to the plane where the substrate is located, the thickness of the color filter structure is 2 μm to 3 μm; Preferably, the depth of the first opening is 1 μm to 2 μm; Preferably, along a direction away from the substrate, a size of the first opening gradually increases; Preferably, the orthographic projection of the first opening on the substrate is located within the orthographic projection range of the color filter structure on the substrate; Preferably, a surface of the color filter structure facing away from the substrate is parallel to a plane where the substrate is located.

8. The display panel according to claim 1, characterized in that: The reflective layer comprises a first conductive layer, a second conductive layer and a third conductive layer which are stacked in sequence; Preferably, the first conductive layer comprises indium tin oxide, the second conductive layer comprises silver, and the third conductive layer comprises indium tin oxide; Preferably, the thickness of the first conductive layer is 8nm to 12nm, the thickness of the second conductive layer is 90nm to 110nm, and the thickness of the third conductive layer is 8nm to 12nm; Preferably, the display panel further comprises: an insulating layer, located on a side of the reflective layer away from the side wall, the insulating layer at least covering the reflective layer on a side of the side wall away from the substrate; Preferably, the insulating layer is provided with a second opening, and the orthographic projection of the second opening on the substrate is located within the orthographic projection range of the first opening on the substrate; Preferably, the material of the insulating layer includes organic material and / or inorganic material; Preferably, the refractive index of the organic material is 1.5 to 1.6, and the refractive index of the inorganic material is 1.80 to 2.0; Preferably, the organic material includes photosensitive polyimide; the inorganic material includes at least one of silicon nitride, silicon oxide and silicon oxynitride; Preferably, the material of the insulating layer includes an organic material, and the thickness of the insulating layer is 1 μm to 1.5 μm, and / or the material of the insulating layer includes an inorganic material, and the thickness of the insulating layer is 150 nm to 500 nm.

9. The display panel according to claim 8, characterized in that: The side wall has a first end disposed close to the substrate and a second end disposed away from the substrate, and the side wall includes a plurality of first protrusions; Preferably, in a direction from the first end to the second end, a plurality of the first protrusions are arranged in sequence; Preferably, the angle between the line connecting the first end and the second end and the plane where the substrate is located is 20° to 50°; Preferably, along a direction parallel to the plane where the substrate is located, the distance between the first end and the second end is 3 μm to 5 μm; Preferably, along a direction perpendicular to the plane where the substrate is located, the cross-sectional shape of the first protrusion includes a first arc, and an opening of the first arc faces away from the reflective layer; Preferably, a line connecting the midpoints of the plurality of first arcs forms a second arc, and an opening of the second arc faces away from the reflective layer; Preferably, the reflective layer includes a plurality of second protrusions, and the second protrusions are arranged corresponding to the first protrusions; preferably, the insulating layer includes a plurality of third protrusions, and the third protrusions are arranged corresponding to the second protrusions.

10. The display panel according to claim 1, characterized in that: The pixel defining structure includes a planar layer; Preferably, the thickness of the planar layer is 1.6 μm to 4 μm; Preferably, the reflective layer is electrically conductive.

11. The display panel according to claim 1, characterized in that: The pixel defining structure comprises a planar layer and a pixel defining layer, the planar layer is located on a side of the pixel defining layer close to the substrate, and the first opening is located in the pixel defining layer; Preferably, the thickness of the pixel defining layer is 2 μm to 3 μm; Preferably, the display panel further comprises: a second electrode layer, located between the planar layer and the pixel defining layer, wherein a portion of the second electrode layer is exposed in the first opening; Preferably, the reflective layer is conductive and in contact with the second electrode layer.

12. The display panel according to claim 1, characterized in that: The color filter structure includes a red filter structure, a green filter structure and a blue filter structure.

13. A display panel, characterized in that: include: substrate; A pixel defining structure, located on one side of the substrate, wherein the pixel defining structure is provided with a plurality of first openings, and the pixel defining structure includes side walls around the first openings; a reflective layer, covering at least a portion of the side wall; A light emitting device, part of which is located in the first opening, and the light emitting device comprises a light emitting functional layer, and the light emitting functional layer is located on a side of the reflective layer away from the substrate; A color filter structure is located on a side of the light-emitting device away from the substrate, the orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflective layer on the substrate, and the surface of the color filter structure away from the substrate is parallel to the plane where the substrate is located.

14. The display panel according to claim 13, characterized in that: Along the direction perpendicular to the plane where the substrate is located, the thickness of the color filter structure is 2 μm to 3 μm; Preferably, the depth of the first opening is 1 μm to 2 μm; Preferably, along a direction away from the substrate, a size of the first opening gradually increases; Preferably, the orthographic projection of the first opening on the substrate is located within the orthographic projection range of the color filter structure on the substrate.

15. The display panel according to claim 13, characterized in that: The pixel defining structure includes a planar layer; Preferably, the thickness of the planar layer is 1.6 μm to 4 μm; Preferably, the reflective layer is electrically conductive.

16. The display panel according to claim 13, characterized in that: The pixel defining structure comprises a planar layer and a pixel defining layer, the planar layer is located on a side of the pixel defining layer close to the substrate, and the first opening is located in the pixel defining layer; Preferably, the thickness of the pixel defining layer is 2 μm to 3 μm; Preferably, the light emitting device comprises: a second electrode layer located between the planar layer and the pixel defining layer, wherein a portion of the second electrode layer is exposed in the first opening; Preferably, the reflective layer is conductive and in contact with the second electrode layer.

17. The display panel according to claim 13, characterized in that: The side wall has a first end disposed close to the substrate and a second end disposed away from the substrate, and an angle between a line connecting the first end and the second end and a plane where the substrate is located is 20° to 50°; Preferably, along a direction parallel to the plane where the substrate is located, a distance between the first end and the second end is 3 μm to 5 μm.

18. A method for preparing a display panel, characterized in that: include: A pixel defining material layer is prepared on one side of the substrate, and a plurality of first openings are opened in the pixel defining material layer using a halftone process to obtain a pixel defining structure, wherein the pixel defining structure includes a side wall around the first opening; preparing a reflective layer covering at least a portion of the side wall; preparing a light-emitting functional layer at least partially located in the first opening; Prepare a first electrode layer on a side of the light-emitting functional layer away from the substrate; A color filter structure filled in the first opening is prepared on a side of the first electrode layer facing away from the substrate, and the orthographic projection of the color filter structure on the substrate at least partially covers the orthographic projection of the reflective layer on the substrate.

19. The preparation method according to claim 18, characterized in that: The step of preparing a color filter structure filled in the first opening on a side of the first electrode layer away from the substrate comprises: A black matrix is ​​prepared on a side of the first electrode layer facing away from the substrate, wherein the orthographic projection of the black matrix on the substrate surrounds the orthographic projection of the first opening on the substrate; Filling the first opening with a color filter material, and the color filter material fills at least a portion of the space enclosed by the black matrix, to obtain the color filter structure; Preferably, after the step of preparing the reflective layer covering at least a portion of the side wall and before the step of preparing the light-emitting functional layer at least partially located in the first opening, the method further includes: An insulating layer is prepared on a side of the reflective layer facing away from the side wall, and the insulating layer at least covers the reflective layer on a side of the side wall facing away from the substrate.

20. A display device, characterized in that: A display panel comprising any one of claims 1 to 17, or a display panel prepared by the preparation method of claim 18 or 19.

Images