Display module and display device

Abstract

The invention provides a display module and a display device. The display module comprises a substrate; a plurality of light emitting devices disposed on the substrate; the first flat layer is in a grid shape and is arranged on the side, away from the substrate, of the light-emitting devices, and the orthographic projection of the first flat layer on the substrate is located between the orthographic projections of the two adjacent light-emitting devices on the substrate; the second flat layer is arranged on the side, away from the substrate, of the first flat layer, and the refractive index of the second flat layer is larger than that of the first flat layer; the antireflection function layer is arranged on the side, away from the substrate, of the second flat layer, and the antireflection function layer is configured to reduce the reflectivity of incident ambient light. By constructing the patterned first flat layer with the low refractive index and the planarized second flat layer with the high refractive index, the emergent direction of light rays can be gathered in the forward direction, and the forward light emitting efficiency is improved; the reflection reduction function layer is constructed on the second flat layer, the reflectivity at the interface can be reduced, the reflectivity of the screen body is reduced, and the display quality of the screen body in the outdoor environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a display module and a display device capable of improving light efficiency and reducing reflectivity at the same time. Background Art

[0002] As the application scenarios of OLED displays gradually expand, the demand for high brightness and low power consumption has become more and more urgent. However, a considerable portion of the light emitted from the OLED light-emitting layer will be captured or confined inside the screen and will not be emitted outside the screen; and the light emitted outside the screen is not all distributed in the required direction. Therefore, it is necessary to further improve the light extraction efficiency of OLED and distribute it in the required direction to achieve higher brightness in the required direction at the same current density; or to reduce the current density and thus reduce power consumption when the brightness is the same in the required direction.

[0003] In the related technologies, COE (color filter on encapsulation) technology and MLA (Microlens array) technology are often used to solve the above technical problems. Specifically, in COE technology, BM (Black Matrix) + CF (Color Filter) is used instead of C-Pol (Circular Polarizer), and the transmittance of CF can be effectively increased to more than 60%, so the power consumption can be reduced; at the same time, the COE thickness can be reduced to less than 5um, which is suitable for flexible products such as folding and curling. However, COE technology requires multiple photolithography processes on the encapsulation layer to prepare BM and CF film layers, which greatly affects the production capacity and yield, and increases the preparation cost. In MLA technology, by constructing a patterned structure of high and low refractive index stacks on TFE (encapsulation layer), the light field of OLED (Organic Light-Emitting Diode) can be modulated to focus the light in the forward direction, thereby improving the forward light output efficiency and reducing power consumption. However, in MLA technology, the refractive index of the high refractive index film layer is too high, resulting in excessively high reflectivity of the screen, affecting the imaging quality of the screen in outdoor environments. Summary of the invention

[0004] In view of this, the embodiments of the present invention are dedicated to providing a display module, a display panel and a display device, which can improve the light efficiency and reduce the reflectivity at the same time, and improve the screen imaging quality in outdoor environments.

[0005] According to an inventive concept of one aspect of the present invention, there is provided a display module, comprising:

[0006] substrate;

[0007] A plurality of light emitting devices are arranged on the substrate;

[0008] A first flat layer in a grid shape, disposed on a side of the light emitting device away from the substrate, wherein an orthographic projection of the first flat layer on the substrate is located between orthographic projections of two adjacent light emitting devices on the substrate;

[0009] a second flat layer, disposed on a side of the first flat layer away from the substrate, wherein the refractive index of the second flat layer is greater than the refractive index of the first flat layer; and

[0010] The reflection reduction functional layer is disposed on a side of the second flat layer away from the substrate, and the reflection reduction functional layer is configured to reduce the reflectivity of incident ambient light.

[0011] In one embodiment, the second flat layer is a polymer film layer, the polymer film layer is doped with high refractive index particles, and the refractive index of the high refractive index particles is greater than the refractive index of the polymer film layer;

[0012] Preferably, the orthographic projection of the second flat layer on the substrate covers the orthographic projection of the first flat layer and the light emitting device on the substrate;

[0013] Preferably, the polymer film layer comprises an acrylic acid-based polymer, a phenol-containing polymer, or an imide-based polymer;

[0014] Preferably, the high refractive index particles include zirconium oxide, titanium oxide, niobium oxide, aluminum oxide, and tungsten oxide.

[0015] In one embodiment, the anti-reflection functional layer includes doped low-refractive index particles, and the refractive index of the low-refractive index particles is lower than the refractive index of the polymer film layer;

[0016] Preferably, the anti-reflection functional layer further comprises an independent film layer disposed on the second flat layer, wherein the low-refractive particles are doped in the independent film layer;

[0017] Preferably, the independent film layer is an organic polymer film layer;

[0018] Preferably, the low refractive index particles include magnesium fluoride or silicon dioxide;

[0019] Preferably, the low refractive index particles are hollow silica particles.

[0020] In one embodiment, the anti-reflection functional layer includes microstructures distributed in an array on the second flat layer, and the microstructures are arranged in an array;

[0021] Preferably, adjacent microstructures are spaced apart, and the distance between adjacent microstructures is less than or equal to the width of the microstructure.

[0022] Preferably, the shape of the microstructure includes a cylinder, a prism, a cone, a truncated cone, and a tetrahedron;

[0023] Preferably, the relatively close side surfaces of adjacent microstructures are recessed inwards;

[0024] Preferably, the material of the microstructure includes silicon nitride, silicon oxide, and organic polymer.

[0025] In one embodiment, the second flat layer is a polymer film layer doped with high refractive index particles, the refractive index of the high refractive index particles is greater than the refractive index of the polymer film layer, the refractive index of the low refractive index particles is less than the refractive index of the polymer film layer, the high refractive index particles are distributed on a side of the polymer film layer close to the light emitting device, and the low refractive index particles are distributed on a side of the polymer film layer away from the light emitting device;

[0026] Preferably, the high refractive index particles are non-magnetic materials, and the low refractive index particles are magnetic materials;

[0027] Preferably, the high refractive index particles include: zirconium oxide, titanium oxide, niobium oxide, aluminum oxide, and tungsten oxide;

[0028] Preferably, the low refractive index particles include: ferroferric oxide, manganese zinc ferrite, nickel zinc ferrite, and barium ferrite;

[0029] Preferably, the density of the polymer film layer is less than the density of the high refractive index particles, and greater than the density of the low refractive index particles.

[0030] In one embodiment, the display module further comprises a pixel definition layer, the pixel definition layer is provided with a pixel opening for accommodating the light-emitting device, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection range of the opening of the first planar layer on the substrate;

[0031] Preferably, the distance that the orthographic projection edge of the opening of the first planar layer on the substrate extends outward from the orthographic projection edge of the pixel opening on the substrate is less than or equal to 5 um;

[0032] Preferably, the height range of the first flat layer includes 1 to 5 um;

[0033] Preferably, the refractive index of the first flat layer ranges from 1.3 to 2.2;

[0034] Preferably, the thickness of the second flat layer is ≤30um;

[0035] Preferably, the difference in thickness between the second flat layer and the first flat layer is ≥3 um;

[0036] Preferably, a polarizer is disposed above the second flat layer, and a cover plate is disposed above the polarizer;

[0037] Preferably, the display module further comprises an encapsulation layer, the encapsulation layer is arranged between the light emitting device and the first flat layer, and the second flat layer is at least partially in contact with the encapsulation layer;

[0038] Preferably, the encapsulation layer is a multi-layer thin film structure;

[0039] Preferably, the encapsulation layer includes a first inorganic film layer, an organic film layer and a second inorganic film layer stacked in sequence.

[0040] In one embodiment, the pixel definition layer includes a black light absorbing material, the optical density of the pixel definition layer is ≥2, and the display module further includes a cover plate, the cover plate is located above the second flat layer and contacts the second flat layer;

[0041] Preferably, the transmittance of the second planar layer ranges from 50% to 80%.

[0042] In one embodiment, the display module further includes: a touch electrode in a grid shape, the touch electrode is arranged on a side of the first flat layer close to the substrate, and the orthographic projection of the touch electrode on the substrate is within the orthographic projection range of the first flat layer on the substrate.

[0043] In one embodiment, the first flat layer comprises an opening and a flat portion surrounding the opening, a reflective portion is provided on a side of the flat portion close to the opening of the first flat layer, and an orthographic projection of the reflective portion on the substrate at least partially overlaps with an orthographic projection of the first flat layer on the substrate;

[0044] Preferably, along the direction of the first flat layer away from the substrate, the cross-sectional width of the reflective portion gradually decreases;

[0045] Preferably, the side surface of the reflecting portion close to the opening is a plane;

[0046] Preferably, the reflective portion further extends to a side of the flat portion facing away from the substrate, and an orthographic projection of the flat portion on the substrate is located within a range of an orthographic projection of the reflective portion on the substrate.

[0047] According to yet another aspect of the invention, there is provided a display device, comprising the display panel as described in the above embodiment.

[0048] According to the display module and display device of the present invention, by constructing a low-refractive-index patterned first flat layer and a high-refractive-index planarized second flat layer, the emitting direction of light can be forward-focused, thereby improving the forward light-emitting efficiency; and by constructing a reflection-reducing functional layer on the second flat layer, the reflectivity at the interface can be reduced, thereby reducing the reflectivity of the screen and improving the display quality of the screen in outdoor environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a cross-sectional schematic diagram of a display module and a partial optical path schematic diagram according to an embodiment of the present invention.

[0050] Figure 2 It is a partial structural enlarged schematic diagram of a display module according to an embodiment of the present invention.

[0051] Figure 3 It is a partial structural enlarged schematic diagram of a display module according to another embodiment of the present invention.

[0052] Figure 4 FIG. 4 is a cross-sectional schematic diagram of a display module according to another embodiment of the present invention.

[0053] Figure 5 is a flow chart of a method for preparing a display module according to an embodiment of the present invention.

[0054] Figure 6 It is a schematic structural diagram of a first planar layer of a display module according to another embodiment of the present invention.

[0055] Figure 7 FIG. 4 is a schematic structural diagram of a first planar layer of a display module according to another embodiment of the present invention.

[0056] Figure 8 1 is a schematic structural diagram of a display device according to an embodiment of the present invention.

[0057] Description of reference numerals:

[0058] 10- Display panel;

[0059] 100-substrate;

[0060] 200-light emitting device;

[0061] 201-red light emitting unit;

[0062] 202-green light emitting unit;

[0063] 203- blue light emitting unit;

[0064] 300-first flat layer;

[0065] 301- flat part;

[0066] 302-reflection part;

[0067] 400-second flat layer;

[0068] 500-reflection reduction functional layer;

[0069] 501-microstructure;

[0070] 600-pixel definition layer;

[0071] 700-cover plate;

[0072] 800-Polarizer;

[0073] 900-touch electrode;

[0074] TFE1-first inorganic film layer;

[0075] TFE2-organic film layer;

[0076] TFE3-second inorganic film layer. DETAILED DESCRIPTION

[0077] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least part of the known structures and technologies are not shown in order to avoid unnecessary ambiguity of the present invention; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0078] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0079] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0080] In related technologies, the improvement of OLED's luminous efficiency is often accompanied by a decrease in production capacity and yield, or a decrease in screen imaging quality. Based on the above situation, the present invention can improve the luminous efficiency while ensuring that the screen has a lower reflectivity by performing a reflection reduction treatment on the high refractive index film layer.

[0081] Figure 1 It is a cross-sectional schematic diagram of a display module and a partial optical path schematic diagram according to an embodiment of the present invention.

[0082] According to the inventive concept of one aspect of the present invention, a display module is provided, comprising: a substrate 100, a light-emitting device 200, a first flat layer 300, a second flat layer 400 and a reflection reduction functional layer 500. A plurality of light-emitting devices 200 are arranged on the substrate 100. The first flat layer 300 is in a grid shape and is arranged on the side of the light-emitting device 200 away from the substrate 100, and the orthographic projection of the first flat layer on the substrate is located between the orthographic projections of two adjacent light-emitting devices 200 on the substrate. The second flat layer 400 is arranged on the side of the first flat layer 300 away from the substrate 100, and the refractive index of the second flat layer 400 is greater than the refractive index of the first flat layer 300. The reflection reduction functional layer 500 is arranged on the side of the second flat layer 400 away from the substrate 100, and the reflection reduction functional layer is configured to reduce the reflectivity of incident ambient light.

[0083] In this embodiment, by constructing a low-refractive-index patterned first flat layer 300 and a high-refractive-index planarized second flat layer 400, the total reflection of light can be used to converge the light emission direction in the forward direction, thereby improving the forward light emission efficiency; and, by constructing a reflection reduction functional layer 500 on the second flat layer 400, the reflectivity at the interface can be reduced, thereby reducing the reflectivity of the screen and improving the screen display quality in outdoor environments.

[0084] In one embodiment, there is a total reflection interface along the vertical direction between the second flat layer 400 and the first flat layer 300, and the light irradiated by the light emitting device on the interface will be totally reflected, thereby realizing forward focusing.

[0085] In one embodiment, the substrate 100 includes a plastic substrate (eg, polyimide, polyethylene terephthalate, etc.), a glass substrate (eg, silicate glass, quartz glass, etc.), or a metal foil substrate (eg, stainless steel, titanium, copper, etc.).

[0086] In one embodiment, the second planar layer 400 is a polymer film layer, the polymer film layer is doped with high refractive index particles, and the refractive index of the high refractive index particles is greater than the refractive index of the polymer film layer.

[0087] In this embodiment, preferably, the polymer film layer includes an acrylic-based polymer, a phenol-containing polymer, or an imide-based polymer; preferably, the high refractive index particles include zirconium oxide, titanium oxide, niobium oxide, aluminum oxide, or tungsten oxide.

[0088] In one embodiment, the orthographic projection of the second planar layer 400 on the substrate 100 covers the orthographic projection of the first planar layer 300 and the light emitting device 200 on the substrate 100 .

[0089] Figure 2 It is a partial structural enlarged schematic diagram of a display module according to an embodiment of the present invention.

[0090] In one embodiment, Figure 1 and Figure 2 As shown, the reflection reduction functional layer 500 includes a polymer film layer and low-refractive index particles doped in the polymer film layer, and the refractive index of the low-refractive index particles is lower than the refractive index of the polymer film layer.

[0091] In one embodiment, the reflection reduction functional layer 500 further includes an independent film layer disposed on the second flat layer 400 , wherein low-refractive particles are doped in the independent film layer.

[0092] In this embodiment, by providing an independent film layer with a low refractive index on the second flat layer 400 with a high refractive index, the reflectivity of ambient light on the second flat layer 400 can be reduced, thereby improving the display quality of the screen in an outdoor environment.

[0093] In one embodiment, after the second planar layer 400 is prepared, an independent film layer (polymer film layer) doped with scattering ions is additionally prepared thereon to reduce the reflectivity of ambient light.

[0094] Preferably, the independent film layer is an organic polymer film layer, for example, an acrylic-based polymer, a phenol-containing polymer, or an imide-based polymer.

[0095] Preferably, the low refractive index particles include magnesium fluoride or silicon dioxide; further preferably, the silicon dioxide is hollow silicon dioxide, which can reduce its density so that the low refractive index particles can float to the surface in the organic polymer film layer.

[0096] Figure 3 It is a partial structural enlarged schematic diagram of a display module according to another embodiment of the present invention.

[0097] In one embodiment, the anti-reflection functional layer 500 includes microstructures 501 distributed in an array on the second flat layer 400, and the microstructures 501 are arranged in an array to reduce the reflectivity of ambient light. Preferably, the shape of the microstructures 501 includes a cylinder, a prism, a cone, a truncated cone, and a quadrangular pyramid.

[0098] In this embodiment, the side surface of the microstructure 501 can be used to change the angle at which the ambient light irradiates the second planar layer 400 , thereby reducing its reflectivity.

[0099] In one embodiment, adjacent microstructures are spaced apart, and the distance between adjacent microstructures is less than or equal to the width of the microstructure, which has a better effect of reducing the reflectivity thereof.

[0100] Further preferably, adjacent microstructures 501 are first recessed toward the adjacent side surfaces to change the incident angle of the ambient light and the side surfaces of the microstructures 501 , thereby further reducing the reflectivity of the ambient light.

[0101] Preferably, the material of the microstructure 501 includes silicon nitride, silicon oxide, and organic polymer.

[0102] In one embodiment, the second planar layer 400 is a polymer film layer doped with high-refractive index particles, and the refractive index of the high-refractive index particles is greater than the refractive index of the polymer film layer.

[0103] Preferably, the polymer film layer includes an acrylic-based polymer, a phenol-containing polymer, or an imide-based polymer.

[0104] Preferably, the high refractive index particles include zirconium oxide, titanium oxide, niobium oxide, aluminum oxide, and tungsten oxide.

[0105] In this embodiment, the high refractive index particles can be doped into the polymer matrix by physical blending (for example, mixing the particles and the polymer uniformly by mechanical stirring, ultrasonic dispersion, etc.), chemical copolymerization (for example, chemically bonding the particles and the polymer matrix by chemical reaction), etc. After being uniformly mixed, a film is prepared by spin coating, blade coating, casting, etc. In the preparation process, the parameters such as the doping amount, dispersion, and film thickness are controlled to obtain the best optical and mechanical properties.

[0106] In one embodiment, the second flat layer 400 is a polymer film layer doped with both high refractive index particles and low refractive index particles, the refractive index of the high refractive index particles is greater than the refractive index of the polymer film layer, the refractive index of the low refractive index particles is less than the refractive index of the polymer film layer, the high refractive index particles are distributed on a side of the polymer film layer close to the light-emitting device 200, and the low refractive index particles are distributed on a side of the polymer film layer away from the light-emitting device 200.

[0107] In one embodiment, the high refractive index particles and the low refractive index particles have different magnetic characteristics. Preferably, the high refractive index particles are non-magnetic materials, and the low refractive index particles are magnetic materials.

[0108] In this embodiment, during the preparation of the second planar layer 400, in response to the applied magnetic field, the high refractive index particles are distributed in layers on a side close to the first planar layer, and the low refractive index particles are distributed in layers on a side away from the first planar layer.

[0109] In this embodiment, during the preparation of the second flat layer 400, high refractive index particles and low refractive index particles are simultaneously added to the polymer matrix, and then the high refractive index particles are controlled to sink and the low refractive index particles are controlled to float, thereby forming two upper and lower layers with different refractive indices in the same film layer.

[0110] Preferably, the high refractive index particles include: zirconium oxide, titanium oxide, niobium oxide, aluminum oxide, and tungsten oxide.

[0111] Preferably, the low refractive index particles include: ferroferric oxide, manganese zinc ferrite, nickel zinc ferrite, and barium ferrite.

[0112] In one embodiment, the difference in physical properties between high refractive index particles and low refractive index particles can be used to control the stratification. For example, high refractive index particles are high-density particles, which sink in a polymer matrix due to gravity greater than buoyancy, and low refractive index particles are low-density particles (for example, hollow particles), which float in a polymer matrix due to gravity less than buoyancy, thereby achieving stratification of high and low refractive index particles. For example, magnetism can also be used, wherein high refractive index particles are high-density particles and are non-magnetic, and low refractive index particles are magnetic particles, and an external magnetic field is used to control the floating of low refractive index particles, thereby achieving stratification of high and low refractive index particles.

[0113] In one embodiment, the display module also includes a pixel definition layer, which includes a pixel definition layer 600, and the pixel definition layer 600 is provided with a pixel opening for accommodating the light-emitting device 200, and the orthographic projection of the pixel opening on the substrate 100 is located within the orthographic projection range of the opening of the first flat layer 300 on the substrate 100.

[0114] The pixel definition layer 600 can define and divide the position and size of pixels, ensuring that each pixel can accurately emit light and display images. By finely dividing the screen area, the pixel definition layer 600 assigns each pixel a unique horizontal and vertical position coordinate, which determines the precise layout of the image elements on the screen. At the same time, it also defines the size of the pixel, that is, the physical space occupied by each pixel or its logical size in the display matrix. The pixel definition layer 600 can reduce the mutual crosstalk between red, green and blue light, and improve the color accuracy and contrast of the image. Optionally, the pixel definition layer 600 can have a specific structure, such as an undercut structure, a trapezoidal cross-section structure that is narrow at the top and wide at the bottom, etc.

[0115] In one embodiment, the light emitting device 200 includes a red light emitting unit 201 , a green light emitting unit 202 , and a blue light emitting unit 203 .

[0116] Preferably, the distance that the orthographic projection edge of the patterned first planar layer 300 opening on the substrate 100 extends outward from the orthographic projection edge of the pixel opening on the substrate 100 is less than or equal to 5 um.

[0117] Preferably, the height range of the first flat layer 300 includes 1 to 5 um; preferably, the refractive index range of the first flat layer 300 includes 1.3 to 2.2; preferably, the thickness of the second flat layer 400 is ≤30 um; preferably, the height difference between the thickness of the second flat layer 400 and the first flat layer 300 is ≥3 um.

[0118] In this embodiment, the relative positions and sizes of the first planar layer 300 and the pixel definition layer 600 are optimized to ensure that the light emitted from the light emitting unit with a large viewing angle can be totally reflected at the interface between the first planar layer 300 and the second planar layer 400 .

[0119] In one embodiment, a polarizer 800 is disposed above the second flat layer 400, and a cover plate 700 is disposed above the polarizer 800. Preferably, the polarizer 800 is a circular polarizer 800.

[0120] In this embodiment, the polarizer 800 is used to block and absorb the reflected light, thereby further reducing the reflectivity of the screen and improving the display quality of the screen in outdoor environments.

[0121] In one embodiment, the display module also includes an encapsulation layer, which is arranged between the light-emitting device 200 and the first flat layer. The second flat layer 400 is at least partially in contact with the encapsulation layer. The encapsulation layer plays an isolation and insulation role to protect the light-emitting device 200 and the pixel definition layer 600 from being contaminated and damaged.

[0122] Preferably, the encapsulation layer is a multi-layer thin film structure. Further preferably, the encapsulation layer comprises a first inorganic film layer TFE1, an organic film layer TFE2 and a second inorganic film layer TFE3 which are stacked in sequence.

[0123] Figure 4 FIG. 4 is a cross-sectional schematic diagram of a display module according to another embodiment of the present invention.

[0124] In one embodiment, Figure 4 As shown, the pixel definition layer includes a black light absorbing material, the optical density of the pixel definition layer is ≥ 2, and the display module further includes a cover plate 700, which is located above the second flat layer 400 and contacts the second flat layer 400. Preferably, the transmittance of the second flat layer 400 ranges from 50% to 80%.

[0125] In this embodiment, by optimizing the parameters of the pixel definition layer and the second flat layer 400, the polarizer 800 originally arranged on the second flat layer 400 can be omitted to further reduce the influence of the low transmittance of the circular polarizer 800 on the light output and improve the light efficiency. At the same time, the thickness of the screen can be greatly reduced, which is especially suitable for flexible products such as folding and curling.

[0126] In one embodiment, Figures 2 to 4 As shown, the display module also includes a touch electrode 900 , which is in a grid shape. The touch electrode 900 is arranged on a side of the first flat layer 300 close to the substrate 100 , and the orthographic projection of the touch electrode 900 on the substrate 100 is located within the orthographic projection range of the first flat layer 300 on the substrate 100 .

[0127] In this embodiment, the touch electrode 900 is disposed between other functional layers (for example, the encapsulation layer) and the patterned first flat layer 300. The touch electrode 900 can be protected by the first flat layer 300 and other functional layers, thereby saving production process flow, reducing costs and improving production efficiency.

[0128] Figure 5 is a flow chart of a method for preparing a display module according to an embodiment of the present invention.

[0129] According to another aspect of the invention, a method for preparing a display module is also provided. Figure 5 As shown, it includes: operation S510 to operation S530.

[0130] Operation S510 includes preparing a pixel definition layer, a light emitting layer, and an encapsulation layer on the substrate 100 .

[0131] Operation S520 includes preparing a first planar layer on the encapsulation layer, and patterning the first planar layer so that the first planar layer 300 is located above a spaced region between two adjacent light emitting devices 200 .

[0132] Operation S530 includes: preparing a second flat layer 400 on the first flat layer, wherein the refractive index of the second flat layer is greater than the refractive index of the first flat layer;

[0133] Operation S540 includes preparing a reflection reduction functional layer on the second planar layer, wherein the reflection reduction functional layer is configured to reduce reflectivity of incident ambient light.

[0134] In one embodiment, the second flat layer and the anti-reflection functional layer are the same film layer, and preparing the second flat layer on the first flat layer includes: adding high refractive index particles and low refractive index particles into the polymer film layer, controlling the high refractive index particles to sink to the side close to the light-emitting device, and controlling the low refractive index particles to float to the side away from the light-emitting device.

[0135] In one embodiment, the density of the polymer film layer is less than the density of the high refractive index particles and greater than the density of the low refractive index particles. Based on the difference in density between the high refractive index particles and the low refractive index particles, gravity and buoyancy are used to make the high refractive index particles sink to the side close to the light-emitting device and the low refractive index particles float to the side away from the light-emitting device.

[0136] In one embodiment, the density of the polymer film layer is less than the density of the high refractive index particles, the high refractive index particles are non-magnetic materials, and the low refractive index particles are magnetic materials. The low refractive index particles are controlled to float to the side away from the light-emitting device by applying a magnetic field, and the high refractive index particles are made to sink to the side close to the light-emitting device by utilizing the density difference.

[0137] In this embodiment, the stratification of high and low refractive index particles is regulated by applying an external magnetic field, so that the stratification effect can be accurately controlled, which is beneficial to quality control.

[0138] Figure 6 It is a schematic structural diagram of a first planar layer of a display module according to another embodiment of the present invention. Figure 7 FIG. 4 is a schematic structural diagram of a first planar layer of a display module according to another embodiment of the present invention.

[0139] In one embodiment, Figure 6 As shown in (a) and (b), the first flat layer 300 includes an opening and a flat portion 301 surrounding the opening. A reflective portion 302 is provided on the flat portion 301 near the opening of the first flat layer. The orthographic projection of the reflective portion 302 on the substrate 100 at least partially overlaps with the orthographic projection of the first flat layer 300 on the substrate 100.

[0140] In this embodiment, the flat portion 301 has a high light absorption rate, the reflective portion 302 has a high reflectivity, and the orthographic projection of the touch electrode 900 on the substrate 100 is located within the orthographic projection range of the flat portion 301 on the substrate 100, which can effectively absorb the reflected light of the touch electrode and the cathode and other metals in the non-light area, thereby reducing the overall reflectivity. The reflective portion 302 is located at the periphery of the flat portion 301, which can ensure that a high-efficiency microlens structure is formed with the second flat layer 400, and the total reflection of light can be used to positively focus the light emission direction, thereby improving the forward light emission efficiency.

[0141] In one embodiment, Figure 6 (a) and Figure 7 As shown, along the direction of the first flat layer 300 away from the substrate 100, the cross-sectional width of the reflective portion 302 gradually decreases, which can make the light at a larger angle fully reflected and forwardly focus the light emission direction, thereby improving the forward light emission efficiency.

[0142] In one embodiment, a side surface of the reflective portion close to the opening is a plane.

[0143] In one embodiment, Figure 7 As shown, the reflective portion also extends to the side of the flat portion away from the substrate, and the orthographic projection of the flat portion on the substrate is located within the orthographic projection range of the reflective portion on the substrate. By providing a patterned structure on the flat portion 301, the reflected light of the touch electrode and the cathode and other metals in the non-light area can be further reduced, thereby reducing the reflectivity of the screen.

[0144] According to yet another aspect of the invention, there is provided a display panel, comprising the display module as described in the above embodiment.

[0145] In one embodiment, the display panel may be a flexible display panel or a rigid display panel. The light extraction mode of the display panel may be a bottom light extraction mode or a top light extraction mode.

[0146] In one embodiment, the display panel can be applied to any product or component with display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a notebook computer, a navigator, an e-book reader, a player, a laptop computer, a car computer, a desktop computer or a set-top box.

[0147] Figure 8 1 is a schematic structural diagram of a display device according to an embodiment of the present invention.

[0148] According to another aspect of the invention, Figure 8 As shown, a display device is also provided, comprising the display panel 10 of the aforementioned embodiment.

[0149] It should be noted that the display device can be various electronic display products, specifically including but not limited to at least one of a mobile phone, a tablet computer, an e-book reader, a player, a digital camera, a laptop computer, a car computer, a desktop computer, a set-top box, a smart TV, and a wearable device.

[0150] In addition, according to actual needs, the display device may also include other structures such as a touch panel.

[0151] Since the display device of the embodiment of the present application includes the above Figures 1 to 4 All technical solutions of the illustrated embodiment can at least achieve all the above-mentioned technical effects, and will not be repeated here.

[0152] It should be noted that, for the sake of clarity, not all structures of the above-mentioned display panel and display device are described. To achieve the necessary functions of the display panel or display device, those skilled in the art may set other structures according to specific application scenarios.

[0153] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display module, characterized in that: include: substrate; A plurality of light emitting devices are arranged on the substrate; A first flat layer in a grid shape, disposed on a side of the light emitting device away from the substrate, wherein an orthographic projection of the first flat layer on the substrate is located between orthographic projections of two adjacent light emitting devices on the substrate; a second flat layer, disposed on a side of the first flat layer away from the substrate, wherein the refractive index of the second flat layer is greater than the refractive index of the first flat layer; and The reflection reduction functional layer is disposed on a side of the second flat layer away from the substrate, and the reflection reduction functional layer is configured to reduce the reflectivity of incident ambient light.

2. The display module according to claim 1, characterized in that: The second flat layer is a polymer film layer, the polymer film layer is doped with high-refractive index particles, and the refractive index of the high-refractive index particles is greater than the refractive index of the polymer film layer; Preferably, the orthographic projection of the second flat layer on the substrate covers the orthographic projection of the first flat layer and the light emitting device on the substrate; Preferably, the polymer film layer comprises an acrylic acid-based polymer, a phenol-containing polymer, or an imide-based polymer; Preferably, the high refractive index particles include zirconium oxide, titanium oxide, niobium oxide, aluminum oxide, and tungsten oxide.

3. The display module according to claim 2, characterized in that: The anti-reflection functional layer includes doped low-refractive index particles, and the refractive index of the low-refractive index particles is lower than the refractive index of the polymer film layer; Preferably, the anti-reflection functional layer further comprises an independent film layer disposed on the second flat layer, wherein the low-refractive particles are doped in the independent film layer; Preferably, the independent film layer is an organic polymer film layer; Preferably, the low refractive index particles include magnesium fluoride or silicon dioxide; Preferably, the low refractive index particles are hollow silica particles.

4. The display module according to claim 2, characterized in that: The anti-reflection functional layer includes microstructures distributed in an array on the second flat layer, and the microstructures are arranged in an array; Preferably, adjacent microstructures are spaced apart, and the distance between adjacent microstructures is less than or equal to the width of the microstructure; Preferably, the shape of the microstructure includes a cylinder, a prism, a cone, a truncated cone, and a tetrahedron; Preferably, the relatively close side surfaces of adjacent microstructures are recessed inwards; Preferably, the material of the microstructure includes silicon nitride, silicon oxide, and organic polymer.

5. The display module according to claim 2, characterized in that: The second flat layer is a polymer film layer doped with high refractive index particles and low refractive index particles, the refractive index of the high refractive index particles is greater than the refractive index of the polymer film layer, the refractive index of the low refractive index particles is less than the refractive index of the polymer film layer, the high refractive index particles are distributed on a side of the polymer film layer close to the light emitting device, and the low refractive index particles are distributed on a side of the polymer film layer away from the light emitting device; Preferably, the high refractive index particles are non-magnetic materials, and the low refractive index particles are magnetic materials; Preferably, the high refractive index particles include: zirconium oxide, titanium oxide, niobium oxide, aluminum oxide, and tungsten oxide; Preferably, the low refractive index particles include: ferroferric oxide, manganese zinc ferrite, nickel zinc ferrite, and barium ferrite; Preferably, the density of the polymer film layer is less than the density of the high refractive index particles, and greater than the density of the low refractive index particles.

6. The display module according to claim 1, characterized in that: The display module further comprises a pixel definition layer, the pixel definition layer is provided with a pixel opening for accommodating the light emitting device, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection range of the opening of the first planar layer on the substrate; Preferably, the distance that the orthographic projection edge of the opening of the first planar layer on the substrate extends outward from the orthographic projection edge of the pixel opening on the substrate is less than or equal to 5 um; Preferably, the height range of the first flat layer includes 1 to 5 um; Preferably, the refractive index of the first flat layer ranges from 1.3 to 2.2; Preferably, the thickness of the second flat layer is ≤30um; Preferably, the difference in thickness between the second flat layer and the first flat layer is ≥3 um; Preferably, a polarizer is disposed above the second flat layer, and a cover plate is disposed above the polarizer; Preferably, the display module further comprises an encapsulation layer, the encapsulation layer is arranged between the light emitting device and the first flat layer, and the second flat layer is at least partially in contact with the encapsulation layer; Preferably, the encapsulation layer is a multi-layer thin film structure; Preferably, the encapsulation layer includes a first inorganic film layer, an organic film layer and a second inorganic film layer stacked in sequence.

7. The display module according to claim 6, characterized in that: The pixel definition layer includes a black light absorbing material, and the optical density of the pixel definition layer is ≥2. The display module further includes a cover plate, and the cover plate is located above the second flat layer and in contact with the second flat layer; Preferably, the transmittance of the second planar layer ranges from 50% to 80%.

8. The display module according to claim 1, characterized in that: The display module also includes: The touch electrodes are in a grid shape and are arranged on a side of the first flat layer close to the substrate. The orthographic projection of the touch electrodes on the substrate is within the orthographic projection range of the first flat layer on the substrate.

9. The display module according to claim 1, characterized in that: The first flat layer comprises an opening and a flat portion surrounding the opening, a reflective portion is arranged on a side of the flat portion close to the opening of the first flat layer, and an orthographic projection of the reflective portion on the substrate at least partially overlaps with an orthographic projection of the first flat layer on the substrate; Preferably, along the direction of the first flat layer away from the substrate, the cross-sectional width of the reflective portion gradually decreases; Preferably, the side surface of the reflecting portion close to the opening is a plane; Preferably, the reflective portion further extends to a side of the flat portion facing away from the substrate, and an orthographic projection of the flat portion on the substrate is located within a range of an orthographic projection of the reflective portion on the substrate.

10. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 9.

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