Display panel, manufacturing method thereof and display device

Abstract

This disclosure provides a display panel, its manufacturing method, and a display device, belonging to the field of display technology. The display panel includes: a light-emitting substrate; a defining dam disposed on one side of the light-emitting surface of the light-emitting substrate, defining a plurality of spaced-apart defined openings; and a light conversion layer disposed on one side of the light-emitting surface of the light-emitting substrate, comprising a plurality of light conversion units, each corresponding to one of the defined openings. The defining dam has a first surface close to the light-emitting substrate, a second surface away from the light-emitting substrate, and a side surface connecting the outer edges of the first and second surfaces. A line connecting any point on the side surface to the outer edge of the first surface forms a first angle with the first surface; a line connecting the outer edge of the second surface and the outer edge of the first surface forms a second angle with the first surface; the first angle is greater than the second angle and less than 90°. This avoids problems such as color crosstalk and dirt in the display panel.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] QD-OLED display panels consist of a light-emitting substrate and a quantum dot layer. Light-emitting quantum dot particles are used in the quantum dot layer, which converts backlight into emitted pure primary colors. The light conversion layer is formed using inkjet printing; however, in existing technologies, quantum dot inks are prone to color crosstalk problems during printing.

[0003] The information disclosed in the background section is only for enhancing the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this disclosure is to provide a display panel and its manufacturing method, as well as a display device, to avoid problems such as color crosstalk and dirt on the display panel.

[0005] To achieve the above-mentioned objectives, the present disclosure adopts the following technical solution:

[0006] According to a first aspect of this disclosure, a display panel is provided, the display panel having a plurality of sub-pixels;

[0007] The display panel includes:

[0008] Light-emitting substrate;

[0009] A limiting dam is provided on one side of the light-emitting surface of the light-emitting substrate. The limiting dam defines a plurality of spaced-apart limiting openings, and each limiting opening defines the range of a sub-pixel.

[0010] A light conversion layer is disposed on one side of the light-emitting surface of the light-emitting substrate, and the light conversion layer includes a plurality of light conversion units, which are located one-to-one within each of the defined openings, and at least a portion of the light conversion units are made of quantum dot material;

[0011] The defining dam has a first surface close to the light-emitting substrate, a second surface away from the light-emitting substrate, and a side surface connecting the outer edge of the first surface and the outer edge of the second surface. The orthographic projection of the second surface on the light-emitting substrate is located within the orthographic projection of the first surface on the light-emitting substrate.

[0012] The second surface of the defined dam is provided with multiple grooves;

[0013] In a direction perpendicular to the light-emitting substrate, the line connecting any point on the side surface and the outer edge of the first surface forms a first angle with the first surface; the line connecting the outer edge of the second surface and the outer edge of the first surface forms a second angle with the first surface.

[0014] The first included angle is greater than the second included angle but less than 90°.

[0015] In one exemplary embodiment of this disclosure, the side surface includes a first side surface and a second side surface sequentially connected along the direction from the outer edge of the first surface to the outer edge of the second surface;

[0016] The angle between the first side and the first surface is greater than the angle between the second side and the first surface.

[0017] In one exemplary embodiment of this disclosure, the included angle between the first side and the first surface is 75°-85°;

[0018] The angle between the second side and the first surface is 10°-30°.

[0019] In one exemplary embodiment of this disclosure, the height of the first side surface is 1μm-3μm in the direction perpendicular to the light-emitting substrate, and the height of the second side surface is 10μm-15μm.

[0020] In one exemplary embodiment of this disclosure, the depth of the groove is 1μm-3μm in the direction perpendicular to the light-emitting substrate, and the height of the defining dam is 10μm-18μm.

[0021] In one exemplary embodiment of this disclosure, the display panel further includes:

[0022] A low refractive index layer is disposed between the light-emitting substrate and the light conversion layer, wherein the refractive index of the low refractive index layer is less than the refractive index of the light conversion layer.

[0023] In one exemplary embodiment of this disclosure, the light-emitting substrate includes:

[0024] Drive backplane;

[0025] A light-emitting layer is disposed on one side of the driving backplate. The light-emitting layer includes a pixel definition layer and a plurality of light-emitting devices defined by the pixel definition layer. In the direction perpendicular to the driving backplate, the light-emitting devices correspond one-to-one with the defined openings.

[0026] An encapsulation layer is disposed on the side of the light-emitting layer away from the driving backplate. The encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer that are sequentially stacked along the direction away from the substrate.

[0027] The low-refractive-index layer covers at least a portion of the surface of the second inorganic layer on the side away from the substrate, and the low-refractive-index layer has a higher oleophilicity than the second inorganic layer.

[0028] In one exemplary embodiment of this disclosure, the material of the low refractive index layer comprises organic materials and hollow silica particles.

[0029] In one exemplary embodiment of this disclosure, the plurality of sub-pixels includes a plurality of sub-pixel groups spaced apart along a first direction, each sub-pixel group including a plurality of sub-pixels arranged along a second direction, the second direction intersecting the first direction;

[0030] The sub-pixels in two adjacent sub-pixel groups are staggered in the first direction.

[0031] In an exemplary embodiment of this disclosure, the orthographic projection of the defining opening on the light-emitting substrate is a first polygon, and at least a portion of the plurality of grooves have orthographic projections on the light-emitting substrate that are second polygons;

[0032] Wherein, at least one side of the second polygon is parallel to and equal to at least one side of the first polygon.

[0033] In one exemplary embodiment of this disclosure, the plurality of grooves includes a plurality of first grooves;

[0034] The orthographic projection of the defined opening onto the light-emitting substrate is a first quadrilateral, which has two first sides arranged in parallel and two second sides arranged in parallel, with the side length of the first side being greater than the side length of the second side.

[0035] The orthographic projection of the first groove on the light-emitting substrate is a second quadrilateral. The second quadrilateral is located between the first sides of two adjacent first quadrilaterals. The second quadrilateral has two third sides and two fourth sides arranged in parallel. The side length of the first side and the side length of the third side differ by no more than ±0.1μm, and the third side is parallel to the first side.

[0036] In one exemplary embodiment of this disclosure, the plurality of grooves further includes a plurality of second grooves;

[0037] The orthographic projection of the second groove on the light-emitting substrate is a third quadrilateral. The third quadrilateral is located on one side of the second side of the first quadrilateral. The third quadrilateral has two fifth sides and two sixth sides arranged in parallel. The sixth sides are parallel to the second side. The lengths of the fifth and sixth sides are not greater than the length of the second side.

[0038] According to a second aspect of this disclosure, a method for manufacturing a display panel is provided, the display panel having a plurality of sub-pixels, the method for manufacturing the display panel comprising:

[0039] Forming a light-emitting substrate;

[0040] A limiting dam is formed on one side of the light-emitting surface of the light-emitting substrate, the limiting dam defining a plurality of spaced limiting openings, each of the limiting openings defining the range of a sub-pixel;

[0041] A light conversion layer is formed within the defined opening. The light conversion layer includes a plurality of light conversion units, which are located one-to-one within each of the defined openings. At least a portion of the light conversion units are made of quantum dot material.

[0042] The defining dam has a first surface close to the light-emitting substrate, a second surface away from the light-emitting substrate, and a side surface connecting the outer edge of the first surface and the outer edge of the second surface. The orthographic projection of the second surface on the light-emitting substrate is located within the orthographic projection of the first surface on the light-emitting substrate.

[0043] The second surface of the defined dam is provided with multiple grooves;

[0044] In a direction perpendicular to the light-emitting substrate, the line connecting any point on the side surface and the outer edge of the first surface forms a first angle with the first surface; the line connecting the outer edge of the second surface and the outer edge of the first surface forms a second angle with the first surface.

[0045] The first included angle is greater than the second included angle but less than 90°.

[0046] According to a third aspect of this disclosure, a display device is provided, including a display panel as described in the first aspect.

[0047] The display panel disclosed herein has a second surface of the defined dam having multiple grooves, and the line connecting any point on the side surface of the defined dam to the outer edge of the first surface forms a first angle with the first surface; the line connecting the outer edge of the second surface to the outer edge of the first surface forms a second angle with the first surface; the first angle is greater than the second angle but less than 90°. That is, the side surface of the defined dam has a slope. Thus, during inkjet printing, ink printed outside the defined opening area can be effectively collected in the grooves and guided into the corresponding defined opening through both the grooves and the slope, thereby avoiding color crosstalk and contamination problems on the display panel. Attached Figure Description

[0048] The above and other features and advantages of this disclosure will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0049] Figure 1 This is a schematic diagram of the planar structure of the display panel in an exemplary embodiment of this disclosure;

[0050] Figure 2 This is a schematic diagram of the planar structure of the display panel in another exemplary embodiment of this disclosure;

[0051] Figure 3 This is a schematic diagram of the planar structure of the display panel in yet another exemplary embodiment of this disclosure;

[0052] Figure 4 This is a schematic diagram of the planar structure of the display panel in yet another exemplary embodiment of this disclosure;

[0053] Figure 5 yes Figure 1 Cross-sectional view along the A-A' direction;

[0054] Figure 6 yes Figure 1 Cross-sectional view along the B-B' direction;

[0055] Figure 7 yes Figure 1 Cross-sectional view along the C-C' direction;

[0056] Figure 8 This is a schematic diagram of the dam structure in one direction as defined in an exemplary embodiment of this disclosure;

[0057] Figure 9 This is a schematic diagram of the dam structure in another direction as defined in an exemplary embodiment of this disclosure;

[0058] Figure 10 The opening is defined in the exemplary embodiments of this disclosure.

[0059] The annotations for the main components in the diagram are explained below:

[0060] 100 - Light-emitting substrate; 101 - Substrate; 102 - Planarization layer; 103 - First electrode; 104 - Light-emitting functional layer; 105 - Second electrode; 106 - Pixel definition layer; 1061 - Pixel aperture; 107 - First inorganic layer; 108 - Organic layer; 109 - Second inorganic layer; 110 - Light-emitting device; 200 - Low refractive index layer; 301 - Red sub-pixel; 302 - Green sub-pixel; 303 - Blue sub-pixel; 304 - White sub-pixel; 310 - Defining dam; 311 - First groove; 312 - Second groove; 313 - First surface; 314 - Second surface; 315 - Side surface; 151 - First side surface; 152 - Second side surface; 316 - Defined opening; 320 - Light conversion layer; 321 - First light conversion unit; 322 - Second light conversion unit; 323 - Light transmission unit; 400 - First leveling layer; 500 - Filter layer; 510 - Light blocking part; 520 - Filter part; 521 - First filter part; 522 - Second filter part; 523 - Third filter part; 600 - Second leveling layer; 700 - Protective layer; α1 - First included angle; α2 - Second included angle. Detailed Implementation

[0061] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are set forth to give a full understanding of embodiments of this disclosure.

[0062] For clarity, the thickness of regions and layers may be exaggerated in the figures. The same reference numerals in the figures denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0063] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the main technical concept of this disclosure.

[0064] When a structure is "on" other structures, it may mean that the structure is integrally formed on other structures, or that the structure is "directly" set on other structures, or that the structure is "indirectly" set on other structures through another structure.

[0065] The terms “a,” “one,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and that other elements / components / etc. may exist in addition to those listed. The terms “first” and “second” are used only as markers and are not a limitation on the number of objects.

[0066] QD-OLED display panels consist of a light-emitting substrate and a quantum dot layer, with the quantum dot layer containing quantum dot materials. Quantum dots (QDs) are composed of zinc, cadmium, selenium, and sulfur atoms. They are nanomaterials with crystal diameters between 2 and 10 nm. They have unique photoelectric properties; when stimulated by photoelectric signals, they emit pure monochromatic light of various colors depending on the diameter of the quantum dots, thus changing the color of the light source.

[0067] In related technologies, quantum dot layers are usually printed into the corresponding pixel pits using inkjet printing. However, during the printing process, the ink drop point may sometimes deviate or trail, which can easily cause ink to be printed into adjacent pixel pits or above the structure of adjacent pixel pits, resulting in color crosstalk and dirt problems.

[0068] like Figure 1 , Figure 5 and Figure 8As shown, this embodiment of the present disclosure provides a display panel having a plurality of sub-pixels. The display panel includes a light-emitting substrate 100, a defining dam 310, and a light conversion layer 320. The defining dam 310 is disposed on one side of the light-emitting surface of the light-emitting substrate 100, and defines a plurality of spaced defining openings 316, each defining the range of a sub-pixel. The light conversion layer 320 is disposed on one side of the light-emitting surface of the light-emitting substrate 100, and the light conversion layer 320 includes a plurality of light conversion units, each light conversion unit being located correspondingly within each defining opening 316, and at least some of the light conversion units being made of quantum dot material. The defining dam 310 has a first surface 313 near the light-emitting substrate 100, a second surface 314 away from the light-emitting substrate 100, and a side surface 315 connecting the outer edges of the first surface 313 and the second surface 314. The orthographic projection of the second surface 314 onto the light-emitting substrate 100 lies within the orthographic projection of the first surface 313 onto the light-emitting substrate 100. The second surface 314 of the defining dam 310 is provided with a plurality of grooves. In a direction perpendicular to the light-emitting substrate 100, the line connecting any point on the side surface 315 and the outer edge of the first surface 313 forms a first angle α1 with the first surface 313. The line connecting the outer edge of the second surface 314 and the outer edge of the first surface 313 forms a second angle α2 with the first surface 313. The first angle α1 is greater than the second angle α2 and less than 90°.

[0069] The display panel provided in this disclosure has a second surface 314 of the defining dam 310 with multiple grooves, and the line connecting any point on the side surface 315 of the defining dam 310 and the outer edge of the first surface 313 forms a first angle α1 with the first surface 313; the line connecting the outer edge of the second surface 314 and the outer edge of the first surface 313 forms a second angle α2 with the first surface 313; the first angle α1 is greater than the second angle α2 and less than 90°. That is, the side surface 315 of the defining dam 310 has a slope. In this way, during inkjet printing, some ink printed outside the defined opening 316 can be effectively collected in the grooves and guided into the corresponding defined opening 316 through both the grooves and the slope, thereby avoiding color crosstalk and dirt problems on the display panel.

[0070] The components of the display panel provided in this embodiment will now be described in detail with reference to the accompanying drawings:

[0071] like Figure 1 , Figure 5 and Figure 8As shown, this disclosure provides a display panel, which may be a QD-OLED (quantum dot-organic light-emitting diode) display panel. The display panel has multiple sub-pixels. The display panel includes a light-emitting substrate 100, a defining dam 310, and a light conversion layer 320. The defining dam 310 is disposed on one side of the light-emitting surface of the light-emitting substrate 100, and defines a plurality of spaced-apart defining openings 316, each defining the area of ​​a sub-pixel. The light conversion layer 320 is disposed on one side of the light-emitting surface of the light-emitting substrate 100, and the light conversion layer 320 includes a plurality of light conversion units, each light conversion unit being located correspondingly within each defining opening 316, and at least some of the light conversion units are made of quantum dot material.

[0072] like Figure 1 As shown, each sub-pixel can emit light of a different color. Multiple sub-pixels can include multiple red sub-pixels 301, multiple green sub-pixels 302, and multiple blue sub-pixels 303. (See diagram below.) Figure 3 As shown, further, the multiple sub-pixels may include multiple white sub-pixels 304. Specifically, red sub-pixels 301 emit red light; green sub-pixels 302 emit green light; blue sub-pixels 303 emit blue light; and white sub-pixels 304 emit white light. Different sub-pixels can be combined to form different pixel units. For example, in some embodiments of this disclosure, a red sub-pixel 301, a green sub-pixel 302, and a blue sub-pixel 303 are combined to form a pixel unit. In another embodiment, a red sub-pixel 301, a green sub-pixel 302, a blue sub-pixel 303, and a white sub-pixel 304 are combined to form a pixel unit. The color of the light emitted by each sub-pixel is influenced by the structure of the light-emitting substrate 100 and the light conversion layer 320. Different light conversion layers 320 can cause different sub-pixels to emit different colors of light.

[0073] There are various ways to arrange multiple sub-pixels. In some embodiments of this disclosure, the multiple sub-pixels include multiple sub-pixel groups 30 spaced apart along a first direction Y, and each sub-pixel group 30 includes multiple sub-pixels arranged along a second direction X, which intersects with the first direction Y. The sub-pixels in two adjacent sub-pixel groups 30 are staggered in the first direction Y. It should be noted that the staggered arrangement of the sub-pixels in two adjacent sub-pixel groups 30 in the first direction Y means that the line connecting the sub-pixels in one sub-pixel group 30 to the sub-pixels in the other sub-pixel group 30 at the same position is located between the first direction Y and the second direction X, that is, the line is not parallel to either the first direction Y or the second direction X. Of course, the sub-pixels can also be arranged in an array along the first direction Y and the second direction X, and the specific arrangement can be as follows. Figure 2 As shown.

[0074] like Figure 5 As shown, Figure 5 yes Figure 1 Cross-sectional view along the A-A' direction. The light-emitting substrate 100 can be used to provide a light source. In some embodiments of this disclosure, the light-emitting substrate 100 includes a driving backplate and a light-emitting layer disposed on one side of the driving backplate.

[0075] The driving backplane includes a substrate 101 and a driving circuit layer disposed on one side of the substrate 101. The substrate 101 includes a display area and a peripheral area located around the display area. The substrate 101 can be a glass substrate or a flexible substrate, etc., and this disclosure does not limit the specific application.

[0076] The driving circuit layer may include driving circuits, which include pixel circuits and peripheral circuits. The pixel circuits are located in the display area, and the peripheral circuits are located in the peripheral area, connected to the pixel circuits. The light-emitting layer includes a pixel definition layer 106 and multiple light-emitting devices 110 defined by the pixel definition layer 106. The light-emitting devices 110 are located in the display area. The pixel circuits are used to drive the light-emitting devices 110 of the OLED display panel to emit light, and the peripheral circuits are used to provide driving signals to the pixel circuits to control the light-emitting devices 110 to emit light. One pixel circuit and one light-emitting device 110 combine to form a sub-pixel. The pixel circuit can be a 7T1C, 7T2C, 6T1C, or 6T2C pixel circuit, etc., and its structure is not specifically limited here. Wherein, nTmC indicates that one pixel circuit includes n transistors (represented by the letter "T") and m capacitors (represented by the letter "C"). The transistors have a gate G, a source S, and a drain D. There are multiple pixel circuits, and one pixel circuit drives one light-emitting device 110 to emit light. The peripheral circuitry may include gate drive circuitry and light emission control circuitry, and may also include other circuitry. No specific limitations are placed on the specific structure of the peripheral circuitry here. The drive circuit layer also includes a planarization layer 102 for planarization.

[0077] The pixel definition layer 106 can be disposed on one side of the driving backplane, for example, on the surface of the planarization layer 102 away from the substrate 101. The pixel definition layer 106 is used to separate the individual light-emitting devices 110. Specifically, the pixel definition layer 106 can have multiple pixel openings 1061, and the area defined by each pixel opening 1061 is the area of ​​one light-emitting device 110. The shape of the pixel opening 1061, that is, the shape of the outline of the orthographic projection of the pixel opening 1061 onto the driving backplane, can be a polygon, a smooth closed curve, or other shapes. The smooth closed curve can be a circle, an ellipse, etc., and is not specifically limited here.

[0078] The light-emitting device 110 can be connected to each pixel circuit in a one-to-one correspondence, thereby emitting light under the drive of the driving circuit. For example, the light-emitting device 110 can be connected to the source (S) or drain (D) of the transistor in the pixel circuit, and can emit light under the drive of the driving circuit. Taking the light-emitting device 110 as an OLED light-emitting device as an example, the light-emitting device 110 may include a first electrode 103, a light-emitting functional layer 104, and a second electrode 105 stacked sequentially along the direction away from the driving backplate. The first electrode 103 can be disposed on the same surface of the driving backplate as the pixel definition layer 106, and it can serve as the anode of the light-emitting device 110. The outline of the orthographic projection of the first electrode 103 on the driving backplate can be a polygon, a smooth curve, or other shapes. Each pixel opening 1061 of the pixel definition layer 106 exposes each first electrode 103 in a one-to-one correspondence. Each pixel opening 1061 is no larger than the first electrode 103 it exposes, that is, the range of any pixel opening 1061 is within the boundary of its corresponding first electrode 103. The first electrode 103 can be a single-layer or multi-layer structure, and its material can include one or more of conductive metals, metal oxides, and alloys. The light-emitting functional layer 104 is at least partially disposed within the pixel opening 1061, and can include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer sequentially stacked along the direction away from the driving backplate. Visible light is generated by recombinating holes and electrons into excitons in the light-emitting material layer, and the excitons radiate photons. The specific light-emitting principle will not be detailed here.

[0079] The light-emitting functional layers 104 of each light-emitting device 110 can be independent of each other and are arrayed within each pixel opening 1061. That is, the light-emitting functional layers 104 of different light-emitting devices 110 are independent of each other. Of course, the light-emitting functional layers 104 of each light-emitting device 110 can also share at least a portion of the film layer of the light-emitting functional layer 104, thereby reducing the difficulty of the process. For example, in some embodiments of this disclosure, each light-emitting device 110 can share at least one of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. The number of light-emitting material layers is multiple, and they are correspondingly disposed within each pixel opening 1061. The second electrode 105 can cover the light-emitting functional layer 104 and can serve as the cathode of the light-emitting device 110. The second electrode 105 can be a single-layer or multi-layer structure, and its material can include one or more of conductive metals, metal oxides, and alloys. Each light-emitting device 110 can share the same second electrode 105. Specifically, the second electrode 105 is a continuous conductive layer covering the light-emitting functional layer 104 and the pixel definition layer 106 of each light-emitting device 110. That is, the orthogonal projection of the second electrode 105 on the pixel definition layer 106 covers each pixel opening 1061.

[0080] In this embodiment, the light-emitting device 110 emits blue light, meaning the light-emitting substrate 100 can provide a blue light source. This blue light source, combined with the light conversion function of the light conversion layer 320, enables the display panel to display color.

[0081] Furthermore, the light-emitting substrate 100 also includes an encapsulation layer disposed on the side of the light-emitting layer away from the driving backplate. The encapsulation layer may include a first inorganic layer 107, an organic layer 108, and a second inorganic layer 109 sequentially stacked along a direction away from the substrate 101. The first inorganic layer 107 covers the surface of the light-emitting layer away from the driving backplate. The organic layer 108 may be disposed on the surface of the first inorganic layer 107 away from the driving backplate, and the boundary of the organic layer 108 is defined inside the boundary of the first inorganic layer 107. The second inorganic layer 109 covers the organic layer 108 and the first inorganic layer 107 not covered by the organic layer 108. The second inorganic layer 109 can block water and oxygen intrusion, and the flexible organic layer 108 can achieve planarization.

[0082] A limiting dam 310 is disposed on one side of the light-emitting surface of the light-emitting substrate 100, defining a plurality of spaced-apart limiting openings 316, each defining the area of ​​a sub-pixel. Further, in the direction perpendicular to the driving backplate, the light-emitting device 110 corresponds one-to-one with the limiting opening 316. The orthographic projection of the limiting opening 316 onto the light-emitting substrate 100 can be a polygon, a smooth closed curve, or other shapes. The smooth closed curve can be a circle, an ellipse, etc., without special limitation. When it is a polygon, the polygon can be a polygon with chamfered or rounded corners. For example, the orthographic projection of the limiting opening 316 onto the light-emitting substrate 100 is a quadrilateral with chamfered or rounded corners, such as a square or rectangle with chamfered or rounded corners, specifically... Figure 4 As shown.

[0083] like Figure 1 , Figure 5 and Figure 8 As shown, the defining dam 310 has a first surface 313 close to the light-emitting substrate 100, a second surface 314 away from the light-emitting substrate 100, and a side surface 315 connecting the outer edges of the first surface 313 and the second surface 314. The orthographic projection of the second surface 314 onto the light-emitting substrate 100 lies within the orthographic projection of the first surface 313 onto the light-emitting substrate 100. That is, the area of ​​the first surface 313 of the defining dam 310 is larger than the area of ​​the second surface 314. It should be noted that the outer edge of the first surface 313 of the defining dam 310 can be understood as defining the opening boundary of the opening 316 close to the light-emitting substrate 100, and the outer edge of the second surface 314 of the defining dam 310 can be understood as defining the opening boundary of the opening 316 away from the light-emitting substrate 100.

[0084] The second surface 314 of the limiting dam 310 is provided with multiple grooves. The orthographic projection of the grooves onto the light-emitting substrate 100 can be a polygon, a smooth closed curve, or other shapes. The smooth closed curve can be a circle, an ellipse, etc., without special limitation. When it is a polygon, the polygon can be a polygon with chamfered or rounded corners. For example, the orthographic projection of the grooves onto the light-emitting substrate 100 is a quadrilateral with chamfered or rounded corners, such as a square or rectangle with chamfered or rounded corners. There can be multiple grooves, and the shapes and sizes of different grooves can be the same or different.

[0085] like Figure 1 and Figure 10 As shown, the shape and size of the groove can be set according to the shape and size of the defined opening 316. In some embodiments of this disclosure, the orthographic projection of the defined opening 316 onto the light-emitting substrate 100 is a first polygon, and at least some of the grooves have an orthographic projection onto the light-emitting substrate 100 that is a second polygon. At least one side of the second polygon is parallel to and equal to at least one side of the first polygon, meaning they are equal in length. This facilitates patterning design and increases the probability of ink collection outside the defined opening 316 area.

[0086] like Figure 1 , Figures 5 to 7 As shown, Figure 6 yes Figure 1 Cross-sectional view along the B-B' direction; Figure 7 yes Figure 1 A cross-sectional view along the C-C' direction. In one embodiment of this disclosure, the plurality of grooves includes a plurality of first grooves 311. The orthographic projection of the opening 316 on the light-emitting substrate 100 is a first quadrilateral, which has two relatively parallel first sides L1 and two relatively parallel second sides L2, the side length of the first side L1 being greater than the side length of the second side L2. The orthographic projection of the first groove 311 on the light-emitting substrate 100 is a second quadrilateral, which is located between the first sides L1 of two adjacent first quadrilaterals, and has two relatively parallel third sides L3 and two relatively parallel fourth sides L4, the side length of the first side L1 and the side length of the third side L3 differing by no more than ±0.1 μm, that is, the side length of the first side L1 and the side length of the third side L3 are approximately equal, and the third side L3 is parallel to the first side L1.

[0087] Furthermore, the plurality of grooves also includes a plurality of second grooves 312. The orthographic projection of the second groove 312 onto the light-emitting substrate 100 is a third quadrilateral, which is located on one side of the second side L2 of the first quadrilateral. The third quadrilateral has two relatively parallel fifth sides L5 and two relatively parallel sixth sides L6. The sixth sides L6 are parallel to the second side L2, and the side lengths of both the fifth sides L5 and the sixth sides L6 are not greater than the side length of the second side L2. The side length of the sixth side L6 may be approximately equal to the side length of the fourth side L4.

[0088] like Figure 1 , Figures 5 to 7 , Figure 8 and Figure 9 As shown, in this disclosure, in addition to providing a groove in the limiting dam 310, the shape of the side surface 315 of the limiting dam 310 is further used to solve problems such as ink deviation from the limiting opening 316. In some embodiments of this disclosure, in the direction perpendicular to the light-emitting substrate 100, the line connecting any point on the side surface 315 of the limiting dam 310 and the outer edge of the first surface 313 has a first included angle α1 with the first surface 313; the line connecting the outer edge of the second surface 314 and the outer edge of the first surface 313 has a second included angle α2 with the first surface 313; the first included angle α1 is greater than the second included angle α2 and less than 90°. Within this range, the side surface 315 of the limiting dam 310 has a suitable slope, which helps to guide ink outside the limiting opening 316 into the corresponding limiting opening 316.

[0089] In some embodiments of this disclosure, the depth of the groove in the direction perpendicular to the light-emitting substrate 100 is 1μm-3μm, such as 1μm, 1.2μm, 1.4μm, 1.5μm, 1.6μm, 1.8μm, 2μm, 2.2μm, 2.4μm, 2.5μm, 2.6μm, 2.7μm, 2.8μm, 2.9μm, 3μm, etc., but not limited thereto. The height of the dam 310 is limited to 10μm-18μm. For example, it can be 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, etc., but not limited thereto.

[0090] In some embodiments of this disclosure, the side surface 315 includes a first side surface 151 and a second side surface 152 sequentially connected along the direction from the outer edge of the first surface 313 to the outer edge of the second surface 314. The angle between the first side surface 151 and the first surface 313 is greater than the angle between the second side surface 152 and the first surface 313. The angle between the first side surface 151 and the first surface 313 is 75°-85°, such as 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, etc., but is not limited thereto. The angle between the second side surface 152 and the first surface 313 is 10°-30°, such as 10°, 12°, 14°, 16°, 18°, 20°, 22°, 24°, 27°, 28°, 30°, etc., but is not limited thereto.

[0091] Furthermore, in the direction perpendicular to the light-emitting substrate 100, the height of the first side surface 151 is 1μm-3μm, such as 1μm, 1.2μm, 1.4μm, 1.5μm, 1.6μm, 1.8μm, 2μm, 2.2μm, 2.4μm, 2.5μm, 2.6μm, 2.7μm, 2.8μm, 2.9μm, 3μm, etc., but not limited thereto. The height of the second side surface 152 is 10μm-15μm, such as 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, etc., but not limited thereto.

[0092] The light conversion layer 320 is disposed on one side of the light-emitting surface of the light-emitting substrate 100, and the light conversion layer 320 includes a plurality of light conversion units, which are located in each defined opening 316 in a corresponding manner, and at least some of the light conversion units are made of quantum dot material.

[0093] like Figure 1 , Figure 5 and Figure 7 As shown, in some embodiments of this disclosure, the light conversion unit includes a first light conversion unit 321, a second light conversion unit 322, and a light transmission unit 323. The materials of the first light conversion unit 321 and the second light conversion unit 322 may include quantum dot materials. For example, the first light conversion unit 321 contains red quantum dot material to convert blue light emitted by the light-emitting substrate 100 into red light, and the second light conversion unit 322 contains green quantum dot material to convert blue light emitted by the light-emitting substrate 100 into green light. The light transmission unit 323 can be an air layer or a transparent material layer. For example, a transparent polymer resin material, such as acrylic, can be used as the transparent material layer. Furthermore, the materials of the first light conversion unit 321, the second light conversion unit 322, and the light transmission unit 323 may also include light scattering particles, such as titanium dioxide (TiO2) scattering particles, to increase the light extraction efficiency of each sub-pixel.

[0094] In other embodiments of this disclosure, the light conversion unit may further include a third light conversion unit. The material of the third light conversion unit may include quantum dot materials. For example, the material of the third light conversion unit may include yellow quantum dot materials and a transparent material, used to convert blue light emitted by the light-emitting substrate 100 into yellow light, while simultaneously transmitting some blue light. The converted yellow light and the transmitted blue light mix to form white light. Alternatively, the material of the third light conversion unit may include red quantum dot materials, green quantum dot materials, and a transparent material, used to partially convert the blue light emitted by the light-emitting substrate 100 into red light and partially into green light, while simultaneously transmitting some blue light. The converted red light, green light, and transmitted blue light mix to form white light.

[0095] Furthermore, the display panel also includes a low refractive index layer 200 disposed between the light-emitting substrate 100 and the light conversion layer 320. The refractive index of the low refractive index layer 200 is lower than that of the light conversion layer 320. When light emitted from the light-emitting substrate 100 passes through the low refractive index layer 200 and enters the light conversion layer 320, since the refractive index of the low refractive index layer 200 is lower than that of the light conversion layer 320, light (including transmitted blue light and light converted by quantum dots in the light conversion layer 320) can be prevented from exiting the light conversion layer 320 to the low refractive index layer 200, thus preventing a decrease in light extraction efficiency.

[0096] A low-refractive-index layer 200 covers at least a portion of the surface of the second inorganic layer 109 on the side away from the substrate 101. The low-refractive-index layer 200 has a higher oleophilicity than the second inorganic layer 109, allowing printing ink to adhere to it and improving printing accuracy. In some embodiments of this disclosure, the material of the low-refractive-index layer 200 comprises organic materials and hollow silica particles.

[0097] The display panel also includes a light filter layer 500 disposed on the side of the light conversion layer 320 away from the light-emitting substrate 100. The light filter layer 500 includes a light-shielding portion 510 and a plurality of light filter portions 520 separated by the light-shielding portion 510. The light-shielding portion 510 may be made of a light-shielding material; for example, the material of the light-shielding portion 510 may include black resin. In the direction perpendicular to the light-emitting substrate 100, the plurality of light filter portions 520 are disposed one-to-one with each defined opening 316; for example, the center line of each light filter portion 520 is collinear with the center line of each defined opening 316. The light filter portions 520 may be made of a light-filtering material, and each light filter portion 520 allows only one color of light to pass through. Light emitted from the light-emitting substrate 100 passes through the light conversion layer 320 and exits through the corresponding light filter portion 520. The light filtering unit 520 may include a first light filtering unit 521, a second light filtering unit 522, and a third light filtering unit 523. The first light filtering unit 521 corresponds to the first light conversion unit 321 and allows only red light to pass through. The second light filtering unit 522 corresponds to the second light conversion unit 322 and allows only green light to pass through. The third light filtering unit 523 corresponds to the light transmission unit 323 and allows only blue light to pass through. Furthermore, the light filtering unit 520 may also include a light transmitting unit, corresponding to the transmission unit, which allows all light to pass through, i.e., white light.

[0098] The display panel also includes a first leveling layer 400, a second leveling layer 600, and a protective layer 700. The first leveling layer 400 covers the surface 315 of the defining dam 310 and the light conversion layer 320 away from the light-emitting substrate 100. The first leveling layer 400 may contain organic materials, achieving planarization of the defining dam 310 and the light conversion layer 320. Further, a light filter layer 500 is disposed on the side of the first leveling layer 400 away from the light-emitting substrate 100. The second leveling layer 600 covers the surface 315 of the light filter layer 500 away from the light-emitting substrate 100, specifically covering the surface 315 of the light-shielding portion 510 and the light filter portion 520 away from the light-emitting substrate 100. The second leveling layer 600 may contain organic materials, achieving planarization of the light filter portion 520 and the light-shielding portion 510. The protective layer 700 is disposed on the side of the light filter layer 500 away from the light-emitting substrate 100. The material of the protective layer 700 may include inorganic materials. The protective layer 700 covers the side surface 315 of the second leveling layer 600 away from the light-emitting substrate 100 to block water and oxygen intrusion through the protective layer 700.

[0099] like Figure 1 , Figure 5 and Figure 7 As shown, this disclosure also provides a method for manufacturing a display panel, including:

[0100] Step S100: Forming the light-emitting substrate 100;

[0101] In step S200, a limiting dam 310 is formed on one side of the light-emitting surface of the light-emitting substrate 100. The limiting dam 310 defines a plurality of spaced limiting openings 316, and each limiting opening 316 defines the range of a sub-pixel.

[0102] In step S300, a light conversion layer 320 is formed within a defined opening 316. The light conversion layer 320 includes a plurality of light conversion units, which are located one-to-one within each defined opening 316. At least some of the light conversion units are made of quantum dot material.

[0103] The limiting dam 310 has a first surface 313 close to the light-emitting substrate 100, a second surface 314 away from the light-emitting substrate 100, and a side surface 315 connecting the outer edge of the first surface 313 and the outer edge of the second surface 314. The orthographic projection of the second surface 314 on the light-emitting substrate 100 is located within the orthographic projection of the first surface 313 on the light-emitting substrate 100.

[0104] The second surface 314 of the limiting dam 310 is provided with a plurality of grooves;

[0105] In the direction perpendicular to the light-emitting substrate 100, the line connecting any point on the side surface 315 and the outer edge of the first surface 313 has a first included angle α1 with the first surface 313; the line connecting the outer edge of the second surface 314 and the outer edge of the first surface 313 has a second included angle α2 with the first surface 313.

[0106] The first included angle α1 is greater than the second included angle α2 and less than 90°.

[0107] In some embodiments of this disclosure, after step S100 and before step S200, the method for manufacturing the display panel further includes:

[0108] In step S110, a low refractive index layer 200 is formed on one side of the light-emitting surface of the light-emitting substrate 100. The refractive index of the low refractive index layer 200 is less than the refractive index of the light conversion layer 320.

[0109] In some embodiments of this disclosure, after step S200, the method for manufacturing the display panel further includes:

[0110] In step S300, a first leveling layer 400 is formed on the side of the limiting dam 310 and the light conversion layer 320 away from the light-emitting substrate 100;

[0111] In step S400, a light filter layer 500 is formed on the side of the first leveling layer 400 away from the light-emitting substrate 100. The light filter layer 500 includes a light-shielding portion 510 and a plurality of light filter portions 520 separated by the light-shielding portion 510. In the direction perpendicular to the light-emitting substrate 100, the plurality of light filter portions 520 are disposed in a one-to-one correspondence with each defined opening 316.

[0112] In step S500, a second leveling layer 600 is formed on the side of the filter layer 500 away from the light-emitting substrate 100.

[0113] In step S600, a protective layer 700 is formed on the side of the second leveling layer 600 away from the light-emitting substrate 100.

[0114] This disclosure also provides a display device, including a display panel. The display panel can be any of the display panels described in the above embodiments, and its specific structure and beneficial effects can be referred to the embodiments of the display panel described above, which will not be repeated here. The display device of this disclosure can be an electronic device such as a mobile phone, tablet computer, or television, which will not be listed here.

[0115] It should be noted that although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps, such as omitting certain steps, combining multiple steps into one step, and / or breaking down one step into multiple steps, should all be considered part of this disclosure.

[0116] It should be understood that this disclosure is not limited to the detailed structure and arrangement of the components presented in this specification. This disclosure is capable of other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this disclosure. It should be understood that this disclosure, as disclosed and defined in this specification, extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of this disclosure. The embodiments described in this specification illustrate the best known mode for implementing this disclosure and will enable those skilled in the art to utilize this disclosure.

Claims

1. A display panel, characterized in that, The display panel has multiple sub-pixels; The display panel includes: A light-emitting substrate; the light-emitting substrate includes a driving backplate, a light-emitting layer and an encapsulation layer, the light-emitting layer is disposed on one side of the driving backplate, the light-emitting layer includes a pixel definition layer and a plurality of light-emitting devices defined by the pixel definition layer; the encapsulation layer is disposed on the side of the light-emitting layer away from the driving backplate, the encapsulation layer includes a first inorganic layer, an organic layer and a second inorganic layer stacked sequentially along the direction away from the driving backplate; A limiting dam is provided on one side of the light-emitting surface of the light-emitting substrate. The limiting dam defines a plurality of spaced limiting openings. In the direction perpendicular to the driving back plate, the light-emitting device corresponds one-to-one with the limiting opening. Each limiting opening defines the range of a sub-pixel. A light conversion layer is disposed on one side of the light-emitting surface of the light-emitting substrate, and the light conversion layer includes a plurality of light conversion units, which are located one-to-one within each of the defined openings, and at least a portion of the light conversion units are made of quantum dot material; The defining dam has a first surface close to the light-emitting substrate, a second surface away from the light-emitting substrate, and a side surface connecting the outer edges of the first surface and the second surface. The orthographic projection of the second surface on the light-emitting substrate lies within the orthographic projection of the first surface on the light-emitting substrate. The second surface of the defining dam is provided with a plurality of grooves. In a direction perpendicular to the light-emitting substrate, the line connecting any point on the side surface and the outer edge of the first surface forms a first angle with the first surface. The line connecting the outer edge of the second surface and the outer edge of the first surface forms a second angle with the first surface. The first angle is greater than the second angle and less than 90°. A low refractive index layer is disposed between the light-emitting substrate and the light conversion layer, wherein the refractive index of the low refractive index layer is less than that of the light conversion layer; the low refractive index layer covers at least a portion of the surface of the second inorganic layer on the side away from the driving backplate, and the oleophilicity of the low refractive index layer is greater than that of the second inorganic layer.

2. The display panel according to claim 1, characterized in that, The side surface includes a first side surface and a second side surface that are sequentially connected along the direction from the outer edge of the first surface to the outer edge of the second surface; The angle between the first side and the first surface is greater than the angle between the second side and the first surface.

3. The display panel according to claim 2, characterized in that, The angle between the first side and the first surface is 75°-85°; The angle between the second side and the first surface is 10°-30°.

4. The display panel according to claim 3, characterized in that, In the direction perpendicular to the light-emitting substrate, the height of the first side is 1μm-3μm, and the height of the second side is 10μm-15μm.

5. The display panel according to claim 1, characterized in that, In the direction perpendicular to the light-emitting substrate, the depth of the groove is 1μm-3μm, and the height of the limiting dam is 10μm-18μm.

6. The display panel according to claim 1, characterized in that, The low-refractive-index layer is composed of organic materials and hollow silica particles.

7. The display panel according to claim 1, characterized in that, The plurality of sub-pixels includes a plurality of sub-pixel groups arranged at intervals along a first direction, and each sub-pixel group includes a plurality of sub-pixels arranged along a second direction, the second direction intersecting the first direction; The sub-pixels in two adjacent sub-pixel groups are staggered in the first direction.

8. The display panel according to claim 1, characterized in that, The orthographic projection of the defined opening onto the light-emitting substrate is a first polygon, and at least a portion of the plurality of grooves onto the light-emitting substrate are orthographic projections of a second polygon; Wherein, at least one side of the second polygon is parallel to and equal to at least one side of the first polygon.

9. The display panel according to claim 1, characterized in that, The plurality of grooves includes a plurality of first grooves; The orthographic projection of the defined opening onto the light-emitting substrate is a first quadrilateral, which has two first sides arranged in parallel and two second sides arranged in parallel, with the side length of the first side being greater than the side length of the second side. The orthographic projection of the first groove on the light-emitting substrate is a second quadrilateral. The second quadrilateral is located between the first sides of two adjacent first quadrilaterals. The second quadrilateral has two third sides and two fourth sides arranged in parallel. The side length of the first side and the side length of the third side differ by no more than ±0.1μm, and the third side is parallel to the first side.

10. The display panel according to claim 9, characterized in that, The plurality of grooves also includes a plurality of second grooves; The orthographic projection of the second groove on the light-emitting substrate is a third quadrilateral. The third quadrilateral is located on one side of the second side of the first quadrilateral. The third quadrilateral has two fifth sides and two sixth sides arranged in parallel. The sixth sides are parallel to the second side. The lengths of the fifth and sixth sides are not greater than the length of the second side.

11. A method for manufacturing a display panel, characterized in that, The display panel has multiple sub-pixels, and the method for manufacturing the display panel includes: A light-emitting substrate is formed; the light-emitting substrate includes a driving backplate, a light-emitting layer and an encapsulation layer, the light-emitting layer is disposed on one side of the driving backplate, the light-emitting layer includes a pixel definition layer and a plurality of light-emitting devices defined by the pixel definition layer; the encapsulation layer is disposed on the side of the light-emitting layer away from the driving backplate, the encapsulation layer includes a first inorganic layer, an organic layer and a second inorganic layer stacked sequentially along the direction away from the driving backplate; A low refractive index layer is formed on one side of the light-emitting surface of the light-emitting substrate; the low refractive index layer covers at least a portion of the surface of the second inorganic layer away from the driving back plate, and the oleophilicity of the low refractive index layer is greater than that of the second inorganic layer; A limiting dam is formed on the side of the low refractive index layer away from the light-emitting substrate. The limiting dam defines a plurality of spaced limiting openings. In the direction perpendicular to the driving backplate, the light-emitting device corresponds one-to-one with the limiting opening. Each limiting opening defines the range of a sub-pixel. A light conversion layer is formed within the defined opening, the refractive index of the low refractive index layer is less than the refractive index of the light conversion layer, the light conversion layer includes a plurality of light conversion units, the plurality of light conversion units are located one-to-one within each of the defined openings, and at least a portion of the light conversion units are made of quantum dot material; The defining dam has a first surface close to the light-emitting substrate, a second surface away from the light-emitting substrate, and a side surface connecting the outer edge of the first surface and the outer edge of the second surface. The orthographic projection of the second surface on the light-emitting substrate is located within the orthographic projection of the first surface on the light-emitting substrate. The second surface of the defined dam is provided with multiple grooves; In a direction perpendicular to the light-emitting substrate, the line connecting any point on the side surface and the outer edge of the first surface forms a first angle with the first surface; the line connecting the outer edge of the second surface and the outer edge of the first surface forms a second angle with the first surface. The first included angle is greater than the second included angle but less than 90°.

12. A display device, characterized in that, Includes the display panel as described in any one of claims 1-10.

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