Dodging film, backlight module and display device

Abstract

The utility model discloses a dodging film, a backlight module and a display device, and relates to the technical field of display. The dodging film comprises a base material layer, a light source layer and a light source layer, the first atomization layer is arranged on the light emitting surface of the base material layer; and the second atomization layer is stacked on the first atomization layer far away from one side of the base material layer. The utility model solves the problems that the existing dodging film technology has complex microstructure design, so that the die processing is very difficult, the processing time is long, the success rate is low, and the roll-to-roll production efficiency and the cost of dodging film products are seriously influenced; and an existing uniform light film product still has insufficient shielding performance, so that an enough shielding effect is provided in a mode of overlapping three films during use, and the cost is relatively high.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and in particular to a light uniforming film, a backlight module and a display device. Background Art

[0002] With the development of display technology, mini-LED has many advantages such as long life, wide color gamut, high contrast, and low energy consumption. It is an emerging display solution. Currently, it has appeared in notebook computers and car screen applications, and is gradually developing towards medium and large-size applications.

[0003] For mini-LED applications, the traditional optical film solution in the backlight module is no longer applicable, and a light-homogenizing film with better diffusion efficiency is needed to obtain a sufficiently good light-homogenizing effect to shield the LED light spots and take into account the brightness of the picture at the same time. Therefore, the light-homogenizing film has become an important component for realizing mini-LED backlight applications.

[0004] Patent No. CN101666461B proposes a light homogenizing film, comprising: a substrate film layer, on which a plurality of light homogenizing structures arranged in an array are arranged, the light homogenizing structure comprising: a first groove located on a light incident surface of the substrate film layer and a second groove located on a light exit surface of the substrate film layer, the light incident surface and the light exit surface are arranged opposite to each other, the first groove and the second groove are both regular pyramids, and the number of side edges of the regular pyramid corresponding to the first groove is equal to the number of side edges of the regular pyramid corresponding to the second groove; the orthographic projection of the second groove on the plane where the main body of the substrate film layer is located completely covers the orthographic projection of the first groove on the plane where the main body of the substrate film layer is located, the outline of the orthographic projection of the first groove on the plane where the main body of the substrate film layer is located is a first regular polygon, the outline of the orthographic projection of the second groove on the plane where the main body of the substrate film layer is located is a second regular polygon, the centers of the first regular polygon and the second regular polygon coincide, and the minimum distance from any point on the first regular polygon to the second regular polygon is equal.

[0005] Patent No. CN209821564U proposes an optical film, including a transparent substrate and at least one first annular lens unit whose reflectivity to light gradually decreases along the direction away from the axis; the transparent substrate includes a first surface and a second surface arranged opposite to each other, and the at least one first annular lens unit is arranged on the second surface.

[0006] At present, the design of uniform light film is mainly focused on improving the shielding property of the film. This is because mini-LED belongs to the light source distribution mode of direct backlight. When applied to small and medium-sized or car-mounted display solutions, it is impossible to use a thick diffuser with high shielding effect to provide sufficient shielding. Therefore, it is necessary to use a thin film to improve the shielding property to solve the shielding problem of the light source point.

[0007] The existing uniform light film technology has a complex microstructure design, so the mold processing is very difficult, the processing time is long and the success rate is low, which seriously affects the roll-to-roll production efficiency and cost of the uniform light film products; and the existing uniform light film products still have insufficient shielding properties, so when used, they generally need to be stacked in three films to provide sufficient shielding effect, which is costly. There is currently no effective solution to the above problems. Utility Model Content

[0008] Purpose of the utility model: to provide a light-homogenizing film, a backlight module and a display device to at least solve one of the problems existing in the above-mentioned prior art.

[0009] Technical solution: A light-homogenizing film comprises: a substrate layer; a first atomizing layer, arranged on the light-emitting surface of the substrate layer; and a second atomizing layer, stacked on the first atomizing layer on the side away from the substrate layer; wherein a double atomizing structure of stacking the first atomizing layer and the second atomizing layer is adopted so that the light-homogenizing film has multiple hazes.

[0010] Preferably, the refractive index of the first atomized layer is different from the refractive index of the second atomized layer, so that the light uniforming film has high shielding properties.

[0011] Preferably, the refractive index of the first atomized layer is smaller than the refractive index of the second atomized layer.

[0012] Preferably, the haze of the first atomized layer ranges from 20% to 80%, and it has a low refractive index of 1.35 to 1.45.

[0013] Preferably, hollow particles are arranged in the first atomization layer, and the particle size of the hollow particles is 0.5-50 um.

[0014] Preferably, the second atomized layer is a microlens layer arranged in an array in a preset direction.

[0015] Preferably, the microlens layer is a hemisphere with a preset size and randomly arranged.

[0016] Preferably, the hemisphere has a diameter of 10-100 um and a height of 5-50 um.

[0017] Preferably, the second atomized layer has a high refractive index of 1.5-1.7.

[0018] Preferably, the second atomization layer is provided with high-fold inorganic nanoparticles, and the particle size of the high-fold inorganic nanoparticles is 10-500 nm.

[0019] Preferably, a prism structure layer is disposed on a side of the substrate layer away from the first atomized layer, and the prism structure layer is located on a light incident surface of the substrate layer.

[0020] In order to achieve the above objective, according to another aspect of the present application, a backlight module is also provided.

[0021] The backlight module according to the present application includes the light uniforming film as described above.

[0022] In order to achieve the above objective, according to another aspect of the present application, a display device is also provided.

[0023] The display device according to the present application includes the backlight module as described above.

[0024] Beneficial effect: In the embodiment of the present application, a double atomization structure is adopted, and a double atomization structure in which a first atomization layer and a second atomization layer are superimposed is adopted so that the uniform light film has multiple hazes, thereby achieving the purpose of having multiple hazes, thereby achieving the technical effect of improving the shielding performance, and further solving the problem that the existing uniform light film technology has a complex microstructure design, so the mold processing is very difficult, the processing time is long and the success rate is low, which seriously affects the roll-to-roll production efficiency and cost of the uniform light film product; and the existing uniform light film product still has insufficient shielding properties, so when used, it is generally necessary to use three films in a stacked manner to provide sufficient shielding effect, which is a technical problem of high cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the planar structure of the light homogenizing film of the utility model; and

[0026] Figure 2 The utility model is a schematic diagram of the process of preparing the light-homogenizing film.

[0027] The accompanying drawings are marked as follows:

[0028] 10. Base material layer;

[0029] 20. first atomization layer; 201. hollow particles;

[0030] 30. Second atomization layer; 301. High-fold inorganic nanoparticles;

[0031] 40. Prism structure layer. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] like Figure 1-2 As shown, the present application relates to a light-homogenizing film, a backlight module, a display device and a method for preparing the light-homogenizing film. Figure 1 As shown, the uniform light film includes: a substrate layer 10; the substrate layer 10 refers to a basic material layer, which can achieve a good supporting effect; at the same time, it can also cooperate with other components to achieve multiple functional effects. It should be noted that the substrate layer 10 includes: two end faces; one end face is a light emitting surface, and the other end face is a light incident surface.

[0037] Preferably, the substrate layer 10 includes, but is not limited to, any one of polyethylene terephthalate (PET), polycarbonate (PC) or polymethyl methacrylate (PMMA), which has excellent mechanical properties, transparency and heat resistance, and serves as the main substrate layer 10 in the uniform light film, providing strength and stability while maintaining the transparency of the material; it can also achieve the effect of having a variety of materials to choose from, thereby achieving the effect of flexible use.

[0038] More preferably, the thickness of the substrate layer 10 is 20-250 um. It can be understood that a good supporting effect can be achieved, and at the same time, a variety of sizes can be selected.

[0039] The first atomized layer 20 is arranged on the light emitting surface of the substrate layer 10; the main function of the atomized layer is to scatter light and make it evenly distributed, thereby eliminating hot spots and shadows of the light source and improving the brightness uniformity of the display screen or lighting equipment. The above effect is usually achieved by introducing micron or nanometer-scale scattering particles into the film.

[0040] The second atomized layer 30 is stacked on the first atomized layer 20 on the side away from the substrate layer 10; by stacking the second atomized layer 30 on the upper surface of the first atomized layer 20, a good molding effect can be achieved, and at the same time, a good secondary atomization effect and wear resistance can also be achieved.

[0041] The double atomization structure of the first atomization layer 20 and the second atomization layer 30 is adopted so that the light-homogenizing film has multiple hazes. The first atomization layer 20 and the second atomization layer 30 are sequentially arranged on the upper surface of the substrate layer 10 from bottom to top to form a double atomization structure, so that the light-homogenizing film has multiple haze effects, and finally has a good shielding effect.

[0042] The utility model obtains multiple haze effects by means of double-surface diffusion of the coating surface structure and light scattering caused by the difference in the coating refractive index, so as to improve the shielding property of a single film.

[0043] The utility model provides a light-homogenizing film product which has high shielding performance, a simple microstructure and is easy to produce.

[0044] In order to provide high shielding performance, the utility model first uses a sandblasting mold to reprint a rough surface, and the high roughness of the reprinted surface creates a surface diffusion effect to provide a portion of haze, and then the surface diffusion effect of the microlens array is used to obtain another portion of haze.

[0045] From the above description, it can be seen that the present application achieves the following technical effects:

[0046] In the embodiment of the present application, a double atomization structure is adopted, and a double atomization structure in which a first atomization layer 20 and a second atomization layer 30 are superimposed is adopted so that the homogenizing film has multiple hazes, thereby achieving the purpose of having multiple hazes, thereby achieving the technical effect of improving the shielding performance, and further solving the problem that the existing homogenizing film technology has a complex microstructure design, so the mold processing is very difficult, the processing time is long and the success rate is low, which seriously affects the roll-to-roll production efficiency and cost of the homogenizing film product; and the existing homogenizing film product still has insufficient shielding properties, so when used, it is generally necessary to use three films in a stacked manner to provide sufficient shielding effect, which is a technical problem of high cost.

[0047] Furthermore, the refractive index of the first atomized layer 20 is different from the refractive index of the second atomized layer 30, so that the light homogenizing film has high shielding properties. It can be understood that by setting the refractive index of the first atomized layer 20 and the refractive index of the second atomized layer 30 to be different, the refractive index difference can be used to further improve the shielding effect, thereby further improving the performance of the light homogenizing film.

[0048] Furthermore, the refractive index of the first mist layer 20 is less than the refractive index of the second mist layer 30. It is understood that by placing the first mist layer 20 with a lower refractive index before the second mist layer 30 with a higher refractive index, a gradient optical path is formed, thereby enhancing the uniform diffusion of light and reducing reflection.

[0049] Specifically, the first mist layer 20 has a relatively low refractive index, and its main function is to initially diffuse and scatter the incident light so that the light enters the second layer uniformly. The second mist layer 30 has a relatively high refractive index, and further diffuses and scatters the light, enhances optical uniformity, and reduces direct reflection and hot spots of the light.

[0050] By controlling the refractive index gradient of the two layers of atomized light, the light can be diffused and homogenized layer by layer, improving the overall optical performance. For example, in a display backlight module, this design can significantly improve the uniformity of screen brightness.

[0051] Furthermore, the haze of the first atomized layer 20 is in the range of 20%-80%, and it has a low refractive index of 1.35-1.45. It can be understood that, through the above configuration, the first atomized layer 20 can have a good low refractive index and haze effect.

[0052] Furthermore, hollow particles 201 are provided in the first atomization layer 20, and the particle size of the hollow particles 201 is 0.5-50 um. It can be understood that the hollow particles 201 can not only improve the scattering and diffusion effect of light, but also reduce the density and weight of the material.

[0053] Specifically, the hollow particle 201 has unique structural characteristics, and its inner cavity and shell can significantly affect the propagation path of light and increase the scattering and diffusion effects of light.

[0054] For example: Enhanced light scattering: The shell and inner cavity interface of the hollow particle 201 will produce a multiple scattering effect, causing the light to be scattered more when passing through the atomization layer, thereby improving the uniformity of the light. Refractive index gradient: The difference in refractive index inside and outside the hollow particle 201 can produce a stronger optical interface effect, enhancing the diffusion and uniform distribution of light. Weight reduction: The structure of the hollow particle 201 can reduce the overall density and weight of the material, reducing cost and weight while maintaining optical performance.

[0055] Furthermore, the second atomized layer 30 is a microlens layer arranged in a preset direction. It is understood that a microlens layer of a desired shape can be obtained, thereby obtaining the desired optical performance, and at the same time, a good coordination effect with the first atomized layer 20 can be achieved. The preset direction can be the two-dimensional direction of the X and Y axes in the two coordinate systems.

[0056] It should be noted that the rough surface of the sandblasting mold is a traditional diffusion film structure, which has a certain diffusion atomization effect. The microlens array layer is also a traditional high-efficiency diffusion film structure, which has a high shielding and diffusion effect and a good optical gain effect.

[0057] Furthermore, the microlens layer is a hemispherical layer with a preset size and randomly arranged. It is understandable that a randomly arranged hemispherical microlens layer can be prepared according to actual usage requirements.

[0058] Furthermore, the diameter of the hemisphere is 10-100um, and the height is 5-50um. It is understandable that by setting the size of the hemisphere within the above range, good optical performance can be ensured; at the same time, the effect of providing multiple sizes to choose from can be achieved, so as to adapt to the needs of various usage environments, thereby improving practicality. Of course, the size of the hemisphere can be random, as long as it meets the above range, and in this application, the hemisphere is not limited to a uniform size.

[0059] Furthermore, the second atomized layer 30 has a high refractive index of 1.5-1.7. It is understandable that the second atomized layer 30 can have a good high refractive index, thereby achieving a good matching effect with the first atomized layer 20.

[0060] Furthermore, the second atomized layer 30 is provided with high-refractive-index inorganic nanoparticles 301, and the particle size of the high-refractive-index inorganic nanoparticles 301 is 10-500 nm. It can be understood that the high-refractive-index inorganic nanoparticles 301 have high refractive index, good chemical stability and unique optical properties, and can ensure good optical performance.

[0061] Preferably, the high-refractive-index inorganic nanoparticles 301 include, but are not limited to, titanium dioxide and zinc oxide, etc. They have high refractive index and good chemical stability.

[0062] Furthermore, a prism structure layer 40 is provided on the side of the substrate layer 10 away from the first atomization layer 20, and the prism structure layer 40 is located on the light incident surface of the substrate layer 10. It can be understood that by providing a prism structure layer 40 on the light incident surface of the substrate layer 10, the effect of improving the optical performance can be achieved. Due to structural reasons, the prism structure layer 40 on the back of the substrate layer 10 has a high penetration effect to increase the intensity of light entering the substrate surface, which can make the uniform light film of the utility model have high brightness. Among them, the prism is a linear extension with one-dimensional directionality.

[0063] Preferably, the prism structure layer 40 has a refractive index of 1.4-1.6 and an isosceles triangle shape with a vertex angle of 60°-95°. In the present application, there is no special requirement for the refractive index of the prism structure layer 40, which only needs to meet the above range.

[0064] The specific examples are further described below:

[0065] First, the basic structure of the light homogenizing film includes a substrate layer 10 and a prism structure layer 40 disposed on the light incident side of the substrate layer 10 , and the prism structure layer 40 has an isosceles triangle shape with a top angle of 90° and a bottom width of 50 um.

[0066] Secondly, prepare the test equipment: stack the light-homogenizing film directly on the mini-LED light source to observe the shielding effect, and measure the brightness with BM-7A.

[0067] Example 1

[0068] The microlens layer is a randomly arranged hemisphere with a diameter of 50um and a height of 25um. The refractive index of the microlens layer is 1.65, the refractive index of the first atomized layer 20 is 1.35, the haze of the first atomized layer 20 is 20%, and the refractive index of the prism structure layer 40 is 1.53.

[0069] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7556cd / M 2 .

[0070] Example 2

[0071] The difference between Example 2 and Example 1 is that the refractive index of the first atomized layer is 1.45.

[0072] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7717cd / M 2 .

[0073] Example 3

[0074] The difference between Example 3 and Example 1 is that the haze of the first atomized layer 20 is 50%.

[0075] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7210cd / M 2 .

[0076] Example 4

[0077] The difference between Example 4 and Example 1 is that the refractive index of the first atomized layer 20 is 1.45, and the haze of the first atomized layer 20 is 50%.

[0078] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7297cd / M 2 .

[0079] Example 5

[0080] The difference between Example 5 and Example 1 is that the haze of the first atomized layer 20 is 80%.

[0081] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7021cd / M 2 .

[0082] Example 6

[0083] The difference between Example 6 and Example 1 is that the refractive index of the first atomized layer 20 is 1.45, and the haze of the first atomized layer 20 is 80%.

[0084] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7104cd / M 2 .

[0085] Example 7

[0086] The difference between Example 7 and Example 1 is that the microlens layer uses randomly arranged hemispheres with a diameter of 10 um and a height of 5 um.

[0087] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7398cd / M 2 .

[0088] Example 8

[0089] The difference between Example 8 and Example 1 is that the microlens layer uses randomly arranged hemispheres with a diameter of 100 um and a height of 50 um.

[0090] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7666cd / M 2 .

[0091] Example 9

[0092] The difference between Example 9 and Example 1 is that the refractive index of the microlens layer is 1.5.

[0093] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7087cd / M 2 .

[0094] Comparative Example 1

[0095] The difference between Comparative Example 1 and Example 1 is that it only has a substrate layer, a microlens layer and a prism structure layer, and the refractive index of the microlens layer is 1.65, and the refractive index of the prism structure layer is 1.53.

[0096] At this time, after testing, the uniform light film results are: the number of sheets that can be shielded is 4, and the brightness is 6101cd / M 2 .

[0097] Comparative Example 2

[0098] The difference between Comparative Example 2 and Example 1 is that the haze of the first atomized layer is 10%.

[0099] At this time, after testing, the uniform light film results are: the number of sheets that can be shielded is 3, and the brightness is 6579cd / M 2 .

[0100] Comparative Example 3

[0101] The difference between Comparative Example 3 and Example 1 is that the refractive index of the first atomized layer is 1.55.

[0102] At this time, after testing, the uniform light film results are: the number of sheets that can be shielded is 3, and the brightness is 6289cd / M 2 .

[0103] Comparative Example 4

[0104] The difference between Comparative Example 4 and Example 1 is that the haze of the first atomized layer is 90%.

[0105] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 6548cd / M 2 .

[0106] Comparative Example 5

[0107] The difference between Comparative Example 5 and Example 1 is that the refractive index of the microlens layer is 1.45.

[0108] At this time, after testing, the uniform light film results are: the number of sheets that can be shielded is 3, and the brightness is 6478cd / M 2 .

[0109] Comparative Example 6

[0110] The difference between Comparative Example 6 and Example 1 is that the refractive index of the microlens layer is 1.75.

[0111] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 6814cd / M 2 .

[0112] Comparative Example 7

[0113] The difference between Comparative Example 7 and Example 1 is that the microlens layer uses randomly arranged hemispheres with a diameter of 8 um and a height of 4 um.

[0114] At this time, after testing, the uniform light film results are: the number of sheets that can be shielded is 2, and the brightness is 6911cd / M 2 .

[0115] Comparative Example 8

[0116] The difference between Comparative Example 8 and Example 1 is that the microlens layer uses randomly arranged hemispheres with a diameter of 110 um and a height of 55 um.

[0117] At this time, after testing, the uniform light film results are: the number of sheets that can be blocked is 1, and the brightness is 7752cd / M 2 .

[0118] The results of various embodiments and comparative examples are shown in Table 1:

[0119] Table 1

[0120]

[0121] From the above test results we can see that:

[0122] 1. It can be seen from Example 1 and Comparison 1 that, under the premise that other parameters remain unchanged, a double atomization structure is adopted and a refractive index difference is used at the same time, the shielding effect and brightness of the uniform light film are improved, and a single film can be used to achieve the purpose of shielding LED lamp beads.

[0123] 2. It can be seen from Examples 1, 3 and 5 that, under the premise that other parameters remain unchanged, as the haze value of the first atomized layer continues to increase within the threshold range of the present application, the uniform light film maintains a good shielding effect, but the brightness decreases as the haze increases.

[0124] 3. It can be seen from Examples 1, 3 and 5 and Comparative Examples 2 and 4 that, under the premise that other parameters remain unchanged, as the haze value of the first atomized layer exceeds the threshold range of the present application, the uniform light film will have poor shielding effect or poor brightness.

[0125] 4. It can be seen from Examples 1-2, 3-4 and 5-6 that, under the premise that other parameters remain unchanged, as the refractive index of the first atomized layer continues to increase within the threshold range of the present application, the uniform light film maintains a good shielding effect, and the brightness increases with the increase of the refractive index.

[0126] 5. It can be seen from Examples 1-2 and Comparative Example 3 that, under the premise that other parameters remain unchanged, as the refractive index of the first atomized layer exceeds the threshold range of the present application, the light homogenizing film will have a poor shielding effect.

[0127] 6. It can be seen from Examples 1, 7-8 and Comparative Examples 7-8 that, under the premise that other parameters remain unchanged, as the size of the microlens layer exceeds the threshold range of the present application, the uniform light film effect will be poor. When the size of the microlens layer is too small, the shielding property becomes poor. When the size of the microlens layer is too large, the shielding property is good, but the microstructure is too large, making the film thickness too large, which is not conducive to the thinning requirements, and the microstructure visible to the naked eye makes the picture taste poor.

[0128] 7. It can be seen from Examples 1, 9 and Comparative Examples 5-6 that, under the premise that other parameters remain unchanged, as the refractive index of the microlens layer exceeds the threshold range of the present application, the uniform light film effect will be poor. When the refractive index of the microlens layer is too small, the shielding property becomes poor. When the refractive index of the microlens layer is too large, the shielding property is too strong, resulting in low brightness.

[0129] In summary, 1. When the parameters are outside the set values ​​of this application, the shielding effect of the uniform light film is poor, so multiple sheets must be stacked to achieve sufficient shielding effect, which also leads to low optical brightness.

[0130] 2. When the haze of the first atomized layer is too high, the brightness is too low, which will also cause the uniform light film to fail to achieve the expected high brightness target.

[0131] 3. When the size of the microlens layer is too large, the shielding property is good, but the microstructure is too large, which makes the film thickness too large and is not conducive to the thinning demand, and the microstructure is visible to the naked eye, which makes the picture taste poor.

[0132] The utility model also has the following beneficial effects:

[0133] The utility model improves the light utilization of the mini-LED output light through an inverted prism structure layer on the back, and provides ultra-high shielding through a double-layer microstructure design on the front, so as to achieve a single film with sufficient shielding and high brightness.

[0134] The present application also relates to a backlight module, including the light homogenizing film as described above, which can be used in a liquid crystal display device to improve the display quality of the display device. The backlight module of this embodiment includes a light guide plate and other known structures such as a light emitting unit, which will not be described in detail here.

[0135] The present application also relates to a display device, comprising a display panel and the above-mentioned backlight module, wherein the backlight module is used to provide a backlight source for the display panel.

[0136] The display device of this embodiment may be any product or component having a display function, such as a liquid crystal panel, electronic paper, a liquid crystal television, or a liquid crystal display.

[0137] like Figure 2 As shown, the present application also relates to a method for preparing a light-homogenizing film, which is applied to prepare the light-homogenizing film as described above; the method comprises the following steps:

[0138] Step 1: preparing a substrate layer 10;

[0139] Step 2: coating a first light-curing coating on the substrate layer 10;

[0140] Step 3: Using a sandblasting mold to obtain a first atomized layer 20 by embossing using a light-curing transfer process;

[0141] Step 4: coating a second light-curing coating on the first atomized layer 20;

[0142] Step 5: Using a microlens mold and performing photocuring transfer process to emboss and obtain a second atomized layer 30;

[0143] Step 6: coating a third light-curing coating on the substrate layer 10 away from the first atomized layer 20;

[0144] Step seven: obtaining the prism structure layer 40 by mold embossing.

[0145] Specifically, step 1: preparing a substrate layer 10;

[0146] The selected substrate layer 10 is cleaned to ensure that there is no dust, oil or other impurities on its surface to ensure the effect of the subsequent coating process. Commonly used materials for the substrate layer 10 include polyethylene terephthalate (PET), polycarbonate (PC), glass, etc.

[0147] Step 2: coating a first light-curing coating on the substrate layer 10;

[0148] The coating method includes, but is not limited to: uniformly coating the first photocurable coating on the substrate layer 10 by spin coating, spray coating or dip coating.

[0149] Coating thickness: According to the design requirements, the coating thickness is controlled between a few microns and tens of microns.

[0150] Step 3: obtaining the first atomized layer 20 by embossing through a sandblasting mold using a light-curing transfer process;

[0151] Die preparation: Use a die with a sandblasted pattern and fix it on the imprinting equipment.

[0152] Embossing molding: The substrate layer 10 coated with the first photocurable coating is placed under a mold and cured by ultraviolet (UV) light curing equipment to obtain a first atomized layer 20 with a microstructure.

[0153] Step 4: coating a second light-curing coating on the first atomized layer 20;

[0154] Coating method: The second light-curing coating is evenly coated on the first atomized layer 20 using the same coating method as in step 2.

[0155] Coating thickness: also controlled within the design requirements.

[0156] Step 5: Obtain a second atomized layer by using a microlens mold and performing imprinting molding by a photocuring transfer process;

[0157] Mold preparation: Use a mold with a microlens pattern and fix it on the imprinting equipment.

[0158] Embossed molding: The substrate layer coated with the second photocurable coating is placed under the mold and cured by UV light curing equipment to form a second atomized layer with a microlens structure.

[0159] Step 6: Apply a third light-curing coating on the substrate layer away from the first atomized layer;

[0160] Coating method: evenly coat the third light-curing coating on the other side of the substrate layer.

[0161] Coating thickness: Control coating thickness according to design requirements.

[0162] Step 7: Obtaining a prism structure layer by mold embossing;

[0163] Mold preparation: Use a mold with a prismatic structure and fix it on the imprinting equipment.

[0164] Embossed molding: The substrate layer coated with the third light-curing coating is placed under the mold and cured by UV light-curing equipment to form a prism structure layer.

[0165] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A light homogenizing film, characterized in that: include: A substrate layer (10); A first atomized layer (20) is disposed on the light emitting surface of the substrate layer (10); and A second atomized layer (30) is stacked on the first atomized layer (20) at a side away from the substrate layer (10); A double atomization structure in which a first atomization layer (20) and a second atomization layer (30) are superimposed is adopted so that the light-homogenizing film has multiple hazes.

2. The light homogenizing film according to claim 1, characterized in that: The refractive index of the first atomized layer (20) and the refractive index of the second atomized layer (30) are different, so that the light homogenizing film has high shielding properties.

3. The light homogenizing film according to claim 1, characterized in that: The refractive index of the first atomized layer (20) is smaller than the refractive index of the second atomized layer (30).

4. The light homogenizing film according to claim 1, characterized in that: The haze of the first haze layer (20) is in the range of 20%-80%, and it has a low refractive index of 1.35-1.

45.

5. The light homogenizing film according to claim 1, characterized in that: Hollow particles (201) are arranged in the first atomization layer (20), and the particle size of the hollow particles (201) is 0.5-50 um.

6. The light homogenizing film according to claim 1, characterized in that: The second atomized layer (30) is a microlens layer arranged in an array in a preset direction.

7. The light homogenizing film according to claim 6, characterized in that: The microlens layer is a hemisphere with a preset size and randomly arranged.

8. The light homogenizing film according to claim 7, characterized in that: The diameter of the hemisphere is 10-100um and the height is 5-50um.

9. The light homogenizing film according to claim 1, characterized in that: The second mist layer (30) has a high refractive index of 1.5-1.

7.

10. The light homogenizing film according to claim 1, characterized in that: The second atomization layer (30) is provided with high-fold inorganic nanoparticles (301), and the particle size of the high-fold inorganic nanoparticles (301) is 10-500 nm.

11. The light homogenizing film according to claim 1, characterized in that: A prism structure layer (40) is provided on a side of the substrate layer (10) away from the first atomization layer (20), and the prism structure layer (40) is located on the light incident surface of the substrate layer (10).

12. A backlight module, characterized in that: It comprises the light homogenizing film as described in any one of claims 1 to 11.

13. A display device, characterized in that Comprising the backlight module as claimed in claim 12.

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