High-reflectivity coating, backlight module and display panel

Abstract

The utility model discloses a high-reflectivity coating, a backlight module and a display panel, and belongs to the technical field of display. The high-reflectivity coating comprises multiple layers of basic units, and each basic unit comprises low-refractive-index coatings and high-refractive-index coatings which are alternately stacked. The technical problem that a conventional reflecting film is low in reflectivity is solved.

Description

Technical Field

[0001] This application relates to the field of display technology, and particularly to a high reflectivity coating, a backlight module, and a display panel. Background Art

[0002] In the field of display technology, as an indispensable core component, the core function of the reflective film is to maximize the effective utilization of light through its excellent high reflection characteristics. This characteristic is directly related to the light energy utilization efficiency of the entire display system and the final visual effect display.

[0003] Conventional reflective films are mainly based on PET (polyethylene terephthalate), and are made by adding inorganic particles such as TiO2 and BaSO4, and through processes such as melt extrusion, casting, stretching, and heat setting. Although these traditional methods have improved the performance of the reflective film to a certain extent, their reflectivity is still difficult to meet the requirements of high brightness and high energy efficiency for high-end backlight modules. Summary of the Utility Model

[0004] The main purpose of this application is to provide a high reflectivity coating, a backlight module, and a display panel, aiming to solve the technical problem of the low reflectivity of conventional reflective films.

[0005] To achieve the above object, an embodiment of this application provides a high reflectivity coating, which includes multiple basic units, and each basic unit includes: a low refractive index coating and a high refractive index coating.

[0006] In one embodiment, the low refractive index coating includes: a first curing glue and low refractive index particles dispersed in the first curing glue, wherein the low refractive index particles include: PMMA, PS, MS, PC, or SiO2;

[0007] And / or, the high refractive index coating includes: a second curing glue and high refractive index particles dispersed in the second curing glue, wherein the high refractive index particles include: TiO2 or Ti3O5

[0008] And / or, the refractive index difference between the low refractive index coating and the high refractive index coating is 0.8 to 1.5.

[0009] In one embodiment, the particle size of the low refractive index particles is 2 to 10 μm;

[0010] And / or, the particle size of the high refractive index particles is 5 to 20 μm;

[0011] And / or, the curing glue includes: a thermosetting glue or a photocuring glue;

[0012] And / or, the second curing glue includes: heat-curable glue or light-curable glue.

[0013] In one embodiment, the number of layers of the basic unit is: 11 - 20.

[0014] In one embodiment, the refractive index of the low refractive index coating is: 1.3 - 1.8.

[0015] In one embodiment, the refractive index of the high refractive index coating is: 2.2 - 2.8.

[0016] In one embodiment, the thickness of the low refractive index coating satisfies: T1 = λ / (N1×4), where T1 is the thickness of the low refractive index coating, N1 is the refractive index of the low refractive index coating, and λ is the wavelength of the incident light;

[0017] And / or, the thickness of the high refractive index coating satisfies: T2 = λ / (N2×4), where T2 is the thickness of the high refractive index coating, N2 is the refractive index of the high refractive index coating, and λ is the wavelength of the incident light.

[0018] In one embodiment, the low refractive index coating and the high refractive index coating are sequentially stacked and formed by a spraying process.

[0019] The embodiment of the present application further provides a backlight module, and the backlight module includes the high reflectivity coating as described above.

[0020] The embodiment of the application further provides a display panel, and the display panel includes the high reflectivity coating as described above, or the backlight module as described above.

[0021] The embodiment of the present application provides a high reflectivity coating, which includes multiple basic units. Among them, the basic unit includes: a low refractive index coating and a high refractive index coating. When light is incident on the high reflectivity coating, the light will be reflected and refracted due to passing through interfaces with different refractive indices; and because the high reflectivity coating of the embodiment of the present application has a periodic laminated structure composed of a high refractive index coating and a low refractive index coating, this layout enables the light to experience multiple reflection and refraction processes inside the film layer. Although each refraction will cause part of the light to enter the adjacent film layer, these lights can basically be reflected back to the original incident direction after experiencing multiple internal reflections, greatly limiting the loss of transmitted light. In addition, the lights reflected from each layer of the film can be superimposed on each other to produce constructive interference; this interference phenomenon makes the wave peaks of the reflected light meet the wave peaks (or wave valleys meet wave valleys), thereby significantly enhancing the intensity of the reflected light and improving the reflectivity of the entire high reflectivity coating. Description of the Drawings

[0022] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings required for use in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic structural diagram of the high-reflectivity coating in the embodiments of this application;

[0025] Figure 2 Schematic diagram of the scenario where light is incident on the high-reflectivity coating in the embodiments of this application;

[0026] Figure 3 Schematic structural diagram of the backlight module in the embodiments of this application;

[0027] Figure 4 Schematic diagram of the reflectivity test results of the embodiments of this application and the comparative examples;

[0028] Explanation of the reference numerals in the drawings:

[0029] Label Name Label Name 100 High-reflectivity coating 110 Basic unit 111 Low-refractive-index coating 112 High-refractive-index coating 200 Backlight module 210 Backplane 220 Light source

[0030] The achievement of the objectives, functional features, and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of this utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the embodiments of this utility model.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of this utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0033] In addition, in the embodiments of the present utility model, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the embodiments of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In the embodiments of the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0035] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present utility model.

[0036] The first aspect of the embodiments of the present application provides a high-reflectivity coating, and the high-reflectivity coating includes multiple basic units, and the basic unit includes: a low-refractive-index coating and a high-refractive-index coating.

[0037] In a feasible embodiment, referring to Figure 1 , the high-reflectivity coating 100 includes multiple basic units 110, and the basic unit 110 is composed of alternately stacked low-refractive-index coatings 111 and high-refractive-index coatings 112.

[0038] It should be understood that Figure 1 In the high-reflectivity coating 100 shown in

[0039] Exemplarily, referring to Figure 2 , it is a schematic diagram of the scenario where light enters the high-reflectivity coating 100, where the arrow direction represents the propagation direction of light. From Figure 2It can be seen that when light is incident on the high-reflectivity coating 100, refracted light and reflected light will be simultaneously generated at the interface between the low-refractive-index coating 111 and the high-refractive-index coating 112. The refracted light will further enter the adjacent film layer and cause refraction and reflection again at the next interface. After experiencing multiple internal reflections, these light rays can basically be reflected back to the original incident direction, greatly limiting the loss of transmitted light. In addition, the light rays reflected from each film layer can be superimposed on each other to produce constructive interference, thereby significantly enhancing the intensity of the reflected light and increasing the reflectivity of the entire high-reflectivity coating 100.

[0040] Exemplarily, the refractive index of the low-refractive-index coating is lower than that of the high-refractive-index coating.

[0041] Exemplarily, the refractive index difference between the low-refractive-index coating and the high-refractive-index coating is 0.8 to 1.5.

[0042] In a feasible embodiment, the low-refractive-index coating includes: a first cured glue and low-refractive-index particles dispersed in the first cured glue, wherein the low-refractive-index particles include: PMMA, PS, MS, PC or SiO2.

[0043] In a feasible embodiment, the low-refractive-index particles are dispersed in the first cured glue to form a low-refractive-index coating material; during the preparation process of the high-reflectivity coating, the low-refractive-index coating material can be sprayed onto the target position (for example, the backplane surface of the backlight module) through a spraying process and form a refractive index film after curing. Conventional reflective films usually need to use double-sided tape to fix the reflective film to the target position; however, when the base layer of the reflective film is deformed, this processing method makes the reflective film prone to debonding or damage. The film layer formed by the spraying process used in the embodiments of the present application is continuous and seamless, which helps to improve the integrity of functions such as waterproofing and dustproofing, and can adapt to local deformation of the base layer, and is not prone to warping or cracking. The low-refractive-index particles added to the low-refractive-index coating have a low refractive index, so they can effectively reduce the refractive index of the film layer.

[0044] Conventional reflective films are based on PET as the substrate, and are laid flat on the bottom surface of the backplane of the backlight module, and several double-sided tapes are required for pasting and fixing to prevent warping and deformation; and through holes need to be opened at the LED light strip of the backlight module for avoidance. The high-reflectivity coating of the embodiments of the present application can be formed layer by layer on the backplane of the backlight module through a spraying process, can adapt to local deformation of the base layer, and is not prone to warping or cracking. And because conventional reflective films are based on PET as the substrate, they are also extremely susceptible to the influence of environmental temperature and humidity, resulting in warping deformation; while the substrate of the high-reflectivity coating of the embodiments of the present application has stronger stability.

[0045] PMMA (polymethyl methacrylate) itself has a relatively low refractive index and extremely high transparency, allowing more than 90% of external light to pass through. This helps reduce light reflection and scattering in the film layer, further lowering the refractive index. In addition, PMMA also has good mechanical properties, especially impact resistance, which enables it to maintain the stability and durability of the film layer when making low-refractive-index coatings.

[0046] PS (polystyrene) is a low-refractive-index material and also has relatively high impact strength and flexural strength, which enables it to maintain the overall performance of the film layer when making low-refractive-index coatings.

[0047] MS (silane-modified polyether resin) is a low-refractive-index material and also has high light transmittance, which helps reduce light loss in the film layer and improve the light transmittance.

[0048] PC (polycarbonate) has excellent impact resistance and heat resistance, which enables it to provide better protection and durability when making low-refractive-index coatings.

[0049] SiO2 (silicon dioxide) is a low-refractive-index material and has good chemical stability and abrasion resistance, which enables it to maintain the long-term stability and durability of the film layer when making low-refractive-index coatings.

[0050] In a feasible embodiment, the first curing glue includes: thermosetting glue or photocuring glue.

[0051] In a feasible embodiment, the particle size of the low-refractive-index particles is 2 - 10 μm; for example, the particle size of the low-refractive-index particles is 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc. When the particle size of the low-refractive-index particles is too large, the scattering effect of light on the particle surface will increase, resulting in the deviation of the light propagation direction, reducing the light transmittance and clarity of the film; and large-particle-size particles have a higher refractive index, increasing the refractive index of the low-refractive-index coating and affecting the overall reflectivity of the high-reflectivity coating. In addition, the dispersion difficulty of large-particle-size particles in the film layer increases, easily leading to particle agglomeration and forming an uneven film layer structure, affecting the performance stability of the film. When the particle size of the low-refractive-index particles is too small, it may lead to an enhanced light interference effect, resulting in phenomena such as color shift or interference fringes; and the preparation and dispersion technology of small-particle-size particles is relatively complex, requiring high-precision equipment and process control, increasing the preparation cost of the high-reflectivity coating. Therefore, the particle size of the low-refractive-index particles is determined to be 2 - 10 μm in the embodiments of this application.

[0052] Exemplarily, the content of the first curing glue in the low refractive index coating is 1 to 5 wt.%; for example, the content of the first curing glue in the low refractive index coating is 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, 5 wt.%, etc.

[0053] In a feasible embodiment, the refractive index of the low refractive index coating is: 1.3 to 1.8; for example, the refractive index of the low refractive index coating is 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, etc.

[0054] Exemplarily, the comprehensive refractive index of the low refractive index coating is 1.5.

[0055] In a feasible embodiment, the thickness of the low refractive index coating satisfies: T1 = λ / (N1×4), where T1 is the thickness of the low refractive index coating, N1 is the refractive index of the low refractive index coating, and λ is the wavelength of the incident light.

[0056] In a feasible embodiment, the high refractive index coating includes: a second curing glue and high refractive index particles dispersed in the second curing glue, where the high refractive index particles include: TiO2 or Ti3O5.

[0057] In a feasible example, the high refractive index particles are dispersed in the second curing glue to form a high refractive index coating material; during the preparation of the high reflectivity coating, the high refractive index coating material can be sprayed onto the target position (for example, the backplane surface of the backlight module) through a spraying process, and a refractive index film is formed after curing. Conventional reflective films usually need to use double-sided tape to fix the reflective film to the target position; however, when the base layer of the reflective film deforms, this processing method makes the reflective film prone to debonding or damage. The film layer formed by the spraying process used in the embodiments of the present application is continuous and seamless, which helps to improve the integrity of functions such as waterproofing and dustproofing, and can adapt to local deformations of the base layer, and is not prone to warping or cracking. The high refractive index particles added to the high refractive index coating have a relatively high refractive index, so they can effectively increase the refractive index of the film layer.

[0058] TiO2 (titanium dioxide) is a thin film material with high optical properties. Its refractive index is very high in the entire visible band and near-infrared band spectral regions, and it is almost one of the film materials with the highest refractive index in the visible light band. Therefore, it can effectively increase the refractive index of the film layer. In addition, TiO2 is hard and resistant to chemical corrosion, so it can maintain the stability of the film layer in various environments.

[0059] In a feasible embodiment, the particle size of the high refractive index particles is 5-20 μm; for example, the particle size of the high refractive index particles is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc. When the particle size of the high refractive index particles is too large, the scattering effect of light on the particle surface will be enhanced, resulting in the deviation of the light propagation direction, reducing the light transmittance and clarity of the film; and the dispersion difficulty of large particle size particles in the film layer increases, which easily leads to particle agglomeration, forming an uneven film layer structure and affecting the performance stability of the film. When the particle size of the high refractive index particles is too small, it may lead to the enhancement of the light interference effect, resulting in phenomena such as color shift or interference fringes; and the preparation and dispersion technology of small particle size particles is relatively complex, requiring high-precision equipment and process control, increasing the preparation cost of the high reflectivity coating. Therefore, the particle size of the high refractive index particles is determined to be 5-20 μm in the embodiments of the present application.

[0060] Exemplarily, the content of the second curing glue in the high refractive index coating is 1-5 wt.%; for example, the content of the second curing glue in the high refractive index coating is 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, 5 wt.%, etc.

[0061] In a feasible embodiment, the second curing glue includes: a thermosetting glue or a photocuring glue.

[0062] In a feasible embodiment, the refractive index of the high refractive index coating is: 2.2-2.8; for example, the refractive index of the high refractive index coating is: 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, etc.

[0063] Exemplarily, the comprehensive refractive index of the high refractive index coating is: 2.5.

[0064] In a feasible embodiment, the thickness of the high refractive index coating satisfies: T2 = λ / (N2×4), where T2 is the thickness of the high refractive index coating, N2 is the refractive index of the high refractive index coating, and λ is the wavelength of the incident light.

[0065] Exemplarily, the wavelength of the incident light can be set according to the central wavelength of the light source in the backlight module during the actual application of the high reflectivity coating.

[0066] Exemplarily, a high-reflectivity coating is usually applied to a backlight module, and the light source of the backlight module is usually a white light LED (light-emitting diode), and its wavelength is usually 380-750 nm; taking the center wavelength of white light of 550 nm as an example, when the comprehensive refractive index of the high-refractive-index coating is 2.5, the comprehensive refractive index of the low-refractive-index coating is 1.5, and the number of layers of the basic unit is 15, the thickness of a single high-refractive-index coating is 55 nm, and the thickness of a single low-refractive-index coating is 91.7 nm. Furthermore, the overall thickness of the high-reflectivity coating is 22 μm. Compared with a conventional reflective film (with a thickness of 188 μm for small size and 225 μm for large size), the embodiment of the present application can effectively reduce the film layer thickness of the reflective film while ensuring a high reflectivity, thereby reducing costs.

[0067] In a feasible implementation manner, the number of layers of the basic unit is: 11-20; for example, the number of layers of the basic unit is: 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20.

[0068] Exemplarily, the number of layers of the basic unit is 15.

[0069] In a feasible implementation manner, the low-refractive-index coating and the high-refractive-index coating are sequentially stacked and formed by a spraying process.

[0070] Exemplarily, the materials of the low-refractive-index coatings in a single high-reflectivity coating are the same, and the materials of the high-refractive-index coatings are the same.

[0071] Exemplarily, the curing methods of each layer in a single high-reflectivity coating are the same.

[0072] Exemplarily, since TiO2 and Ti3O5 have better weather resistance and lower water absorption, the top layer of the high-reflectivity coating (i.e., the side close to the light source) can be a high-refractive-index coating, thereby improving the overall stability of the high-reflectivity coating.

[0073] In this embodiment, the high-reflectivity coating includes multiple basic units, where each basic unit includes a low-refractive-index coating and a high-refractive-index coating. When light is incident on the high-reflectivity coating, the light will be reflected and refracted due to passing through interfaces with different refractive indices. Since the high-reflectivity coating in the embodiment of the present application has a periodic laminated structure composed of high-refractive-index coatings and low-refractive-index coatings, this layout enables the light to experience multiple reflection and refraction processes inside the film layer. Although each refraction causes part of the light to enter the adjacent film layer, after experiencing multiple internal reflections, these lights can basically be reflected back to the original incident direction, greatly limiting the loss of transmitted light. In addition, the lights reflected from each layer of the film can be superimposed on each other to produce constructive interference. This interference phenomenon causes the wave peaks of the reflected light to meet (or the wave valleys to meet), thereby significantly enhancing the intensity of the reflected light and increasing the reflectivity of the entire high-reflectivity coating.

[0074] In the second aspect of the embodiment of the present application, a backlight module is provided. Referring to Figure 3 , the backlight module 200 includes a high-reflectivity coating 100; the high-reflectivity coating 100 is disposed on the surface of the back plate 210 of the backlight module 200 close to the light source 220.

[0075] The high-reflectivity coating includes multiple basic units, and each basic unit includes a low-refractive-index coating and a high-refractive-index coating.

[0076] In a feasible implementation manner, the low-refractive-index coating includes a first cured glue and low-refractive-index particles dispersed in the first cured glue, where the low-refractive-index particles include PMMA, PS, MS, PC, or SiO2;

[0077] And / or, the high-refractive-index coating includes a second cured glue and high-refractive-index particles dispersed in the second cured glue, where the high-refractive-index particles include TiO2 or Ti3O5;

[0078] And / or, the refractive index difference between the low-refractive-index coating and the high-refractive-index coating is 0.8 to 1.5.

[0079] In a feasible implementation manner, the particle size of the low-refractive-index particles is 2 to 10 μm;

[0080] And / or, the particle size of the high-refractive-index particles is 5 to 20 μm;

[0081] And / or, the first cured glue includes a thermosetting glue or a photocuring glue;

[0082] And / or, the second cured glue includes a thermosetting glue or a photocuring glue.

[0083] In a feasible embodiment, the number of layers of the basic unit is: 11 to 20.

[0084] In a feasible embodiment, the refractive index of the low-refractive-index coating is: 1.3 to 1.8.

[0085] In a feasible embodiment, the refractive index of the high-refractive-index coating is: 2.2 to 2.8.

[0086] In a feasible embodiment, the thickness of the low-refractive-index coating satisfies: T1 = λ / (N1×4), where T1 is the thickness of the low-refractive-index coating, N1 is the refractive index of the low-refractive-index coating, and λ is the wavelength of the incident light;

[0087] And / or, the thickness of the high-refractive-index coating satisfies: T2 = λ / (N2×4), where T2 is the thickness of the high-refractive-index coating, N2 is the refractive index of the high-refractive-index coating, and λ is the wavelength of the incident light.

[0088] In a feasible embodiment, the low-refractive-index coating and the high-refractive-index coating are sequentially stacked on the back plate of the backlight module by a spraying process.

[0089] The backlight module solves the technical problem of the low reflectivity of the conventional reflective film. Compared with the prior art, the beneficial effects of the backlight module provided by the embodiment of the present invention are the same as those of the high-reflectivity coating provided by the above embodiment, and other technical features in this backlight module are the same as those disclosed in the above embodiment method, and will not be elaborated here.

[0090] The third aspect of the embodiment of the present application provides a display panel, which includes a high-reflectivity coating; the high-reflectivity coating includes multiple basic units, and the basic unit includes: a low-refractive-index coating and a high-refractive-index coating.

[0091] In a feasible embodiment, the low-refractive-index coating includes: a first cured glue and low-refractive-index particles dispersed in the first cured glue, where the low-refractive-index particles include: PMMA, PS, MS, PC or SiO2;

[0092] And / or, the high-refractive-index coating includes: a second cured glue and high-refractive-index particles dispersed in the second cured glue, where the high-refractive-index particles include: TiO2 or Ti3O5;

[0093] And / or, the refractive index difference between the low-refractive-index coating and the high-refractive-index coating is 0.8 to 1.5.

[0094] In a feasible embodiment, the particle size of the low-refractive-index particles is 2 to 10 μm;

[0095] And / or, the particle size of the high refractive index particles is 5 to 20 μm;

[0096] And / or, the first curable glue includes: heat curable glue or light curable glue;

[0097] And / or, the second curable glue includes: heat curable glue or light curable glue.

[0098] In a feasible embodiment, the number of layers of the basic unit is: 11 to 20.

[0099] In a feasible embodiment, the refractive index of the low refractive index coating is: 1.3 to 1.8.

[0100] In a feasible embodiment, the refractive index of the high refractive index coating is: 2.2 to 2.8.

[0101] In a feasible embodiment, the thickness of the low refractive index coating satisfies: T1 = λ / (N1×4), where T1 is the thickness of the low refractive index coating, N1 is the refractive index of the low refractive index coating, and λ is the wavelength of the incident light;

[0102] And / or, the thickness of the high refractive index coating satisfies: T2 = λ / (N2×4), where T2 is the thickness of the high refractive index coating, N2 is the refractive index of the high refractive index coating, and λ is the wavelength of the incident light.

[0103] In a feasible embodiment, the low refractive index coating and the high refractive index coating are sequentially stacked and formed by a spraying process.

[0104] The display panel solves the technical problem of the low reflectivity of the conventional reflective film. Compared with the prior art, the beneficial effects of the display panel provided by the embodiments of the present invention are the same as those of the high reflectivity coating provided by the above embodiments, and other technical features in the display panel are the same as those disclosed in the above embodiment method, and will not be elaborated here.

[0105] In order to enable those skilled in the art to clearly understand the details and operations of the above embodiments of the present application, and to significantly reflect the progressive performance of the embodiments of the present application, the following uses multiple embodiments to illustrate the above technical solutions.

[0106] Example 1

[0107] (1) Provide a high-reflectivity coating, which includes multiple basic units, and the number of layers of the basic unit is 15; the basic unit includes: alternately stacked low-refractive-index coatings and high-refractive-index coatings; the low-refractive-index coating includes: UV curable glue and low-refractive-index particles (PMMA) dispersed in the UV curable glue, and the particle size of PMMA is 5 μm; the high-refractive-index coating includes: UV curable glue and high-refractive-index particles (TiO2) dispersed in the UV curable glue, and the particle size of TiO2 is 10 μm; the comprehensive refractive index of the low-refractive-index coating is 1.5, and the comprehensive refractive index of the high-refractive-index coating is 2.5;

[0108] (2) Set the high-reflectivity coating on the surface of the backplane of the backlight module close to the light source. Among them, the wavelength of the light source of the backlight module is: white light of 380-750 nm, and its central wavelength is 550 nm.

[0109] Example 2

[0110] The setting of the backlight module is the same as that of Example 1, except that: the number of layers of the basic unit of the high-reflectivity coating is 20.

[0111] Comparative Example 1

[0112] The setting of the backlight module is the same as that of Example 1, except that: the high-reflectivity coating is a commercially available PET (polyester) reflective film.

[0113] Comparative Example 2

[0114] The setting of the backlight module is the same as that of Example 1, except that: the number of layers of the basic unit of the high-reflectivity coating is 5.

[0115] Comparative Example 3

[0116] The setting of the backlight module is the same as that of Example 1, except that: the number of layers of the basic unit of the high-reflectivity coating is 10.

[0117] Perform brightness tests on the backlight modules of Example 1, 2 and Comparative Examples 1-3, and the experimental results are shown in Table 1 below:

[0118] Table 1

[0119] Test group Average brightness (nits) Example 1 363.9 Example 2 363.2 Comparative example 1 330.8 Comparative example 2 313.0 Comparative example 3 328.5

[0120] According to the above test results, it can be seen that the backlight modules prepared in Examples 1 and 2 of the present application have relatively high average brightness, and compared with Comparative Examples 1-3, the light energy loss is lower. And by comparing Examples 1, 2 and Comparative Examples 2, 3, it can be seen that the average brightness of the backlight module increases with the increase of the number of layers of the basic unit, and the optimal effect is achieved when the number of layers is 15. And, with the further increase of the number of layers, the average brightness has no obvious improvement effect.

[0121] The reflectivity of the high reflectivity coatings of Example 1, Example 2 and Comparative Example 3 was tested, and the experimental results are as follows Figure 4 as shown; in Figure 4 N represents the number of layers of the basic unit of the high reflectivity coating. Therefore, N = 10 corresponds to Comparative Example 3, N = 15 corresponds to Example 1, and N = 20 corresponds to Example 2. Referring to Figure 4 , it can be seen that when the number of layers is 10 (Comparative Example 3), the reflectivity at the white light center wavelength of 550 nm can reach about 80%, but the spectral reflection band is relatively narrow. When the number of layers is 15 (Example 1), the reflectivity at the white light center wavelength of 550 nm is close to 100%, and a very high reflectivity is maintained from 430 to 580 nm. When the number of layers is 20 (Example 2), the reflectivity at the white light center wavelength of 550 nm and the global reflectivity are both close to those of the case with 15 layers. Therefore, the high reflectivity coating of the embodiment of the present application has a high reflectivity.

[0122] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be included in the patent scope of the present application by the same token.

Claims

1. A high reflectivity coating, characterized in that, The high-reflectivity coating includes multiple basic units, and each basic unit includes: a low-refractive-index coating and a high-refractive-index coating. The refractive index of the low-refractive-index coating is 1.3 to 1.8, the refractive index of the high-refractive-index coating is 2.2 to 2.8, and the refractive index difference between the low-refractive-index coating and the high-refractive-index coating is 0.8 to 1.

5.

2. The highly reflective coating according to claim 1, wherein The low-refractive-index coating includes: a first cured glue and low-refractive-index particles dispersed in the first cured glue. Among them, the low-refractive-index particles include: PMMA, PS, MS, PC, or SiO2; And / or, the high-refractive-index coating includes: a second cured glue and high-refractive-index particles dispersed in the second cured glue. Among them, the high-refractive-index particles include: TiO2 or Ti3O5.

3. The high reflectivity coating according to claim 2, characterized in that, The particle size of the low-refractive-index particles is 2 to 10 μm; And / or, the particle size of the high-refractive-index particles is 5 to 20 μm; And / or, the first cured glue includes: a thermosetting glue or a photocuring glue; And / or, the second cured glue includes: a thermosetting glue or a photocuring glue.

4. The highly reflective coating according to claim 1, wherein The number of layers of the basic unit is: 11 to 20.

5. The high reflectivity coating according to claim 1, characterized in that, The thickness of the low-refractive-index coating satisfies: T1 = λ / (N1×4), where T1 is the thickness of the low-refractive-index coating, N1 is the refractive index of the low-refractive-index coating, and λ is the wavelength of the incident light; And / or, the thickness of the high-refractive-index coating satisfies: T2 = λ / (N2×4), where T2 is the thickness of the high-refractive-index coating, N2 is the refractive index of the high-refractive-index coating, and λ is the wavelength of the incident light.

6. The highly reflective coating according to claim 1, characterized in that, The low-refractive-index coating and the high-refractive-index coating are sequentially stacked and formed by a spraying process.

7. A backlight module, characterized in that, The backlight module includes the high-reflectivity coating according to any one of claims 1 to 6.

8. A display panel, characterized in that, The display panel includes: the high-reflectivity coating according to any one of claims 1 to 6, or the backlight module according to claim 7.

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