High contrast film, polarizing plate and display device

Abstract

The utility model discloses a high-contrast film, a polarizing plate and a display device, and relates to the technical field of optical films. The high-contrast film comprises a base material layer, a first electrode layer and a second electrode layer, the diffusion layer is arranged on one side of the base material layer; the transparent structure layer is arranged on one side, far away from the diffusion layer, of the base material layer; the light absorption structure layer is arranged on the transparent structure layer in a filling manner; wherein the light absorption structure layer flatly fills the surface of one side, far away from the diffusion layer, of the transparent structure layer. According to the utility model, the problems that the existing optical film is complex in design and complicated in framework, and the viewing angle of an observer cannot be effectively controlled according to a use scene are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical films, in particular to a high-contrast film, a polarizing plate and a display device. Background Art

[0002] Image contrast refers to the measurement of the different brightness levels between the brightest white and the darkest black when the display is displayed, that is, the size of the grayscale contrast of a display screen. The larger the difference range, the greater the contrast, and the smaller the difference range, the smaller the contrast. A contrast ratio of 120:1 can easily display vivid and rich colors. When the contrast ratio reaches 300:1, it can support colors of all gray levels.

[0003] LED direct display screen is a large-screen display product that can be spliced ​​to form a large display area. It is widely used in various occasions where large screens are needed, such as conferences, displays, videos, security monitoring, command centers, etc. It can realize multiple display modes such as single screen, full screen, split, and cross-screen roaming.

[0004] In recent years, with the widespread application of LED direct display splicing large screens, the control of the effective viewing angle of viewers in different usage scenarios has become increasingly important. When the screen is at a relatively high position, the viewer is located in the area below the screen, and the effective light must be transferred to the bottom as much as possible; when the screen is at the same height as the person, the viewer is located in the area in front of the screen, and the effective light must be maintained in front of the display as much as possible. Therefore, it is particularly necessary to adjust the optical viewing angle of the screen.

[0005] Patent No. CN116457707A proposes a contrast-improving optical film, including a high-refractive layer having a plurality of spaced-apart gravure patterns on one surface; and a low-refractive layer, which is combined with one surface of the high-refractive layer while filling the gravure pattern, wherein the gravure pattern includes: a concave flat portion, which is concave at the central area and formed horizontally; and a convex curved surface inclined portion, which protrudes from the high-refractive layer to the low-refractive layer between the concave flat portion and one surface of the high-refractive layer and is inclined in a curved surface form. This patent uses a combination of high and low refractive index materials and microstructures to improve the viewing angle by increasing the lateral brightness, thereby achieving a high contrast effect.

[0006] Patent No. CN110537121A proposes a contrast-improving optical film, including a contrast-improving layer, wherein the contrast-improving layer includes a first resin layer and a second resin layer facing the first resin layer, the second resin layer includes a pattern portion having an optical pattern and a flat portion between the optical patterns, the optical pattern has at least one inclined surface relative to the flat portion, the flat portion or the inclined surface has a light absorption layer formed thereon, and the contrast-improving optical film has a minimum reflectivity of 0.5% or less. A polarizing plate, on which a polarizing film and a contrast-improving optical film are stacked in sequence. The invention relates to a contrast-improving optical film (contrastratio improving optical film, contrast-improving optical film, contrast-enhancing optical film, contrast-enhancing optical film), a polarizing plate (polarizing plate, polarizing plate) containing the same, and a liquid crystal display device containing the same, and more specifically, to a contrast-improving optical film for a liquid crystal display (LCD), a polarizing plate containing the same, and a liquid crystal display device containing the same.

[0007] Generally, the most basic high contrast film is a black film that increases the blackness of the display when it is in a black state, thereby increasing the contrast of the display screen. Many other more complex design schemes have also appeared later, such as the previous example CN116457707A, which uses a combination of high and low refractive index materials and microstructures to improve the viewing angle by increasing the side brightness, thereby obtaining a high contrast effect. Or the previous example CN110537121A, which uses microstructures and polarizing plates to obtain high contrast. The disadvantages of these schemes are that the design is complex and the structure is complicated, and the viewer's viewing angle cannot be effectively controlled according to the usage scenario. No effective solution has been proposed for the above-mentioned problems. Utility Model Content

[0008] Purpose of the utility model: to provide a high contrast film, a polarizing plate and a display device to solve the above problems existing in the prior art.

[0009] Technical solution: A high contrast film, comprising: a substrate layer; a diffusion layer, arranged on one side of the substrate layer; a transparent structure layer, arranged on the substrate layer away from the diffusion layer; and a light-absorbing structure layer, filled and arranged on the transparent structure layer; wherein the light-absorbing structure layer fills and flattens the surface of the transparent structure layer away from the diffusion layer.

[0010] Preferably, the transparent structural layer is in the shape of an isosceles triangle, wherein the transmitted light is distributed bilaterally symmetrically and has the highest intensity at a viewing angle of 0 degrees.

[0011] Preferably, the transparent structural layer is in the shape of a non-isosceles triangle, wherein the transmitted light is asymmetrically distributed left and right, and has the highest intensity at a viewing angle deviating from 0 degrees.

[0012] Preferably, the total thickness of the light-absorbing structural layer and the transparent structural layer is 15-25 μm.

[0013] Preferably, the transparent structural layer is a prism structure, the prism structure has a top angle of 55-90°, a bottom width of 30-50 μm, and a height of 15-25 μm.

[0014] Preferably, the transparent structural layer is a first light-curing glue, and the refractive index of the first light-curing glue is in the range of 1.5-1.7.

[0015] Preferably, the light absorbing structure layer is a black structure layer, the black structure layer is a second light-curing glue, and the refractive index range of the second light-curing glue is 1.4-1.55.

[0016] Preferably, the structure of the diffusion layer is a volume diffusion structure, a surface diffusion structure or a microlens array structure.

[0017] In order to achieve the above objective, according to another aspect of the present application, a polarizing plate is also provided.

[0018] The polarizing plate according to the present application includes the high contrast film as described above.

[0019] In order to achieve the above objective, according to another aspect of the present application, a display device is also provided.

[0020] The display device according to the present application includes the polarizing plate as described above.

[0021] Beneficial effect: In the embodiment of the present application, the microstructure is optimized to fill and level the surface of the transparent structure layer away from the diffusion layer through the light-absorbing structure layer, thereby achieving the purpose of controllable viewing angle and high contrast, thereby achieving the technical effect of simplifying the optical film structure and adjusting the viewing angle, and further solving the technical problems of the existing optical film having complex design, complicated structure, and inability to effectively control the viewer's viewing angle according to the usage scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the high contrast film of the utility model;

[0023] Figure 2 It is another schematic diagram of a high contrast film of the utility model;

[0024] Figure 3 This is a simulated diagram of the optical effect of the high contrast film of the utility model having a prism structure of an isosceles triangle;

[0025] Figure 4 This is a simulation diagram of the optical effect of the high contrast film of the utility model having a prism structure of a non-isosceles triangle;

[0026] Figure 5 This is a structural schematic diagram of the first embodiment of the utility model;

[0027] Figure 6 This is a schematic structural diagram of Embodiment 3 of the present utility model;

[0028] Figure 7 This is a schematic structural diagram of the fourth embodiment of the utility model;

[0029] Figure 8 is a structural schematic diagram of the sixth embodiment of the utility model; and

[0030] Fig. 9 It is a structural schematic diagram of comparative example 1 of the present utility model.

[0031] The accompanying drawings are marked as follows:

[0032] 1. Base material layer;

[0033] 2. Diffusion layer;

[0034] 3. Transparent structural layer;

[0035] 4. Light-absorbing structural layer;

[0036] 5. Pressure-sensitive adhesive layer. DETAILED DESCRIPTION

[0037] 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.

[0038] 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 sequence. 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.

[0039] 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.

[0040] 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.

[0041] like Figure 1-2 As shown, the present application relates to a high contrast film, a polarizing plate and a display device. The high contrast film comprises: a substrate layer 1; the substrate layer 1 refers to the base material or substrate to which the optical film or coating is attached, which can achieve good fixing and supporting effects; at the same time, it can also cooperate with other film layer structures to achieve multiple functional effects. Preferably, the substrate layer 1 is PET, PC, PMMA, PE, PVC or PS. It can achieve the effect of multiple materials to be selected, so that the effect can be easily achieved.

[0042] The diffusion layer 2 is arranged on one side of the substrate layer 1; by arranging the diffusion layer 2 on the front side of the substrate layer 1, the effect of light scattering or light diffusion can be achieved, such as: changing the propagation direction of light, reducing reflection, increasing the uniformity of light or softening the light, so as to obtain the desired optical effect. Preferably, the material of the diffusion layer 2 includes but is not limited to: organic materials, such as polymers, resins; silicone, etc.

[0043] The transparent structural layer 3 is arranged on the substrate layer 1 on the side away from the diffusion layer 2; by adopting methods including but not limited to: sputtering, evaporation, spraying, coating, etc., the transparent structural layer 3 is deposited or coated on the bottom (back) of the substrate layer 1, so as to achieve the effect of obtaining the transparent structural layer 3. Preferably, the transparent structural layer 3 is a prism structure. The prism structure can be a conventional prism structure in the field of optical films, which can be used for various optical applications such as light splitting, focusing, and beam splitting; at the same time, these prisms can be arranged into various geometric shapes to achieve different optical functions. Preferably, the transparent structural layer 3 is a black structural layer.

[0044] Of course, it is important to know that the top angle, bottom width, and height of the prism can be adjusted according to specific needs, thereby achieving the effect of adjusting the optical viewing angle.

[0045] Furthermore, the transparent structure layer 3 is in the shape of an isosceles triangle or a non-isosceles triangle. It is understandable that by respectively setting the transparent structure layer 3 in the shape of an isosceles triangle or a non-isosceles triangle, a variety of controllable viewing angles can be achieved, thereby meeting the needs of a variety of use occasions.

[0046] Furthermore, the refractive index of the light-curing glue of the transparent structure layer 3 is 1.5-1.7, which can ensure good optical performance.

[0047] The light-absorbing structural layer 4 is filled in the transparent structural layer 3. By filling the light-absorbing structural layer 4 in the transparent structural layer 3, a good matching effect can be achieved. At the same time, it can also absorb light and reduce reflection to improve the performance of the optical device.

[0048] The light absorbing structure layer 4 fills and levels the surface of the transparent structure layer 3 away from the diffusion layer 2, so that the film layer has a controllable viewing angle and a high contrast. The light absorbing structure layer 4 is used to fill the concave part of the transparent structure layer 3, so that the transparent structure layer 3 is filled to form a flat surface, thereby making the film layer have a controllable viewing angle and a high contrast.

[0049] Specifically, Figure 3 As shown, the transparent structure layer 3 is in the shape of an isosceles triangle, wherein the transmitted light is distributed bilaterally symmetrically and has the highest intensity at a viewing angle of 0 degrees.

[0050] Specifically, when the prisms of the transparent structure layer 3 are isosceles triangles, the transmitted light is bilaterally symmetrical and has the highest intensity at a viewing angle of 0 degrees.

[0051] like Figure 4 As shown, the transparent structural layer 3 is in the shape of a non-isosceles triangle, wherein the transmitted light is asymmetrically distributed left and right, and has the highest intensity at a viewing angle deviating from 0 degrees.

[0052] Specifically, when the prisms of the transparent structural layer 3 are non-isosceles triangles, the transmitted light is asymmetric on the left and right, and has the highest intensity at other higher or lower angles deviating from the 0 degree viewing angle. In this way, the viewing angle control for the highest intensity of the light output can be achieved, thereby obtaining a viewing angle that meets actual usage requirements.

[0053] The light-absorbing structure layer 4 is also a black structure layer, so that the black structure layer provides the blackness of the black screen when the display screen is in a dark state, thereby realizing the contrast-enhancing function of the high-contrast film.

[0054] The high-contrast film of the present application adopts a simple structural design, which can maintain high contrast while controlling the optical viewing angle, further improving the display effect of the LED direct display screen in different usage scenarios, and ultimately achieving the maximum brightness viewing angle while improving the contrast.

[0055] From the above description, it can be seen that the present application achieves the following technical effects:

[0056] In the embodiment of the present application, the microstructure is optimized and the surface of the transparent structure layer 3 away from the diffusion layer 2 is filled and smoothed through the light-absorbing structure layer 4 so that the film layer has a controllable viewing angle and a high contrast ratio, thereby achieving the purpose of having a controllable viewing angle and a high contrast ratio, thereby achieving the technical effect of simplifying the optical film structure and adjusting the viewing angle, and further solving the technical problems of the existing optical film having a complex design, a complicated structure, and an inability to effectively control the viewer's viewing angle according to the usage scenario.

[0057] Furthermore, a pressure-sensitive adhesive layer 5 is provided on the side of the light-absorbing structure layer 4 away from the substrate layer 1. It can be understood that by coating the bottom of the light-absorbing structure with a pressure-sensitive adhesive layer 5, the film can be adhered to another surface under slight pressure, thereby achieving an effect of facilitating assembly and matching.

[0058] Specifically, Figure 4 As shown, for ease of use, a pressure-sensitive adhesive layer 5 is coated below the high-contrast film, and the film is directly attached to the surface of the LED direct display when in use. The diffusion layer 2 on the surface can also provide atomization and scratch resistance functions.

[0059] Furthermore, the total thickness of the light absorbing structure layer 4 and the transparent structure layer 3 is 15-25 μm. It can be understood that by setting the total thickness of the light absorbing structure layer 4 and the transparent structure layer 3 in the range of 15-25 μm, it can be ensured that the film has a good high contrast and brightness effect. At the same time, it can be seen from the experimental data of this application that the brightness of the display is related to the thickness of the transparent structure layer 3, and the greater the thickness, the lower the brightness; therefore, setting the total thickness within the preset size range of this application can obtain the desired optical performance.

[0060] Furthermore, the transparent structure layer 3 is a prism structure, the prism structure has a top angle of 55-90°, a bottom width of 30-50 μm, and a height of 15-25 μm. It is understandable that a variety of sizes can be selected to meet diverse usage requirements.

[0061] Preferably, the total thickness of the light absorbing structure layer 4 and the transparent structure layer 3 is consistent with the height of the prism structure; this can ensure that the light absorbing structure layer 4 fills and flattens one side plane of the transparent structure layer 3, thereby obtaining good optical performance.

[0062] Furthermore, the structure of the diffusion layer 2 is a body diffusion structure, a surface diffusion structure or a microlens array structure. It is understandable that the structure of the diffusion layer 2 can be realized by adopting a variety of structural forms, which can achieve a variety of selected effects, and can also make the light diffused and uniform, and have the effects of scratch resistance and blemish concealment.

[0063] Specifically, the diffusion layer 2 can be a volume diffusion (particle coating), in which tiny particles or powders of the diffusion material are usually directly mixed into a transparent substrate and then applied to the surface of the substrate by coating or dipping, etc. The size and distribution of these tiny particles will affect the scattering effect of light, thereby achieving light diffusion.

[0064] It can also be surface diffusion (sandblasting mold reprinting microstructure), which is usually achieved by making microstructures on the surface of transparent substrates. One common method is to use sandblasting or mold reprinting technology. Sandblasting can produce tiny particles or concave-convex structures on the surface of the substrate, which can scatter light and change its propagation direction to achieve the effect of light diffusion.

[0065] Microlens array (microlens) Microlens array is a special diffusion structure, which consists of many tiny lenses. The geometric shape and arrangement of these lenses can be designed and prepared as needed. Microlens arrays are usually made of optically transparent materials, such as glass or polymers, which can form microlens arrays on the surface of the substrate to achieve light diffusion and homogenization through the refraction and scattering effects of the lenses.

[0066] Further, the transparent structural layer 3 is a first photocurable glue, and the refractive index range of the first photocurable glue is 1.5-1.7. Furthermore, the first photocurable glue is composed of monomers, oligomers, photosensitive substances and additives. It is understandable that the first photocurable glue is a special type of glue that can be rapidly cured when exposed to ultraviolet light or visible light. Its main function is that under light irradiation, the photoinitiator (also called photosensitizer) triggers the monomers or prepolymers in the glue to undergo polymerization or cross-linking reactions, thereby forming a solid structure. Preferably, the photosensitive substance can be a photoinitiator or a photoinitiator monomer. These substances will undergo a chemical reaction when exposed to ultraviolet light or visible light, causing polymerization or cross-linking, thereby achieving the effect of curing the glue.

[0067] Furthermore, the light-absorbing structure layer 4 is a black structure layer, and the black structure layer is a second photocurable glue, and the refractive index range of the second photocurable glue is 1.4-1.55. Furthermore, the second photocurable glue is composed of monomers, oligomers, photosensitive substances, additives and sunscreens. It can be understood that the light-absorbing structure layer 4 is a black structure layer, which can achieve good optical absorption performance. At the same time, a sunscreen is added to the first photocurable glue to make it have the function of light absorption. By setting the refractive index of the photocurable glue of the light-absorbing structure layer 4 in a preset range, a good refractive index can be ensured. At the same time, it can also achieve the effect of reducing the reflection of light at the interface, and by reducing the reflection, the light can more effectively penetrate the light-absorbing structure layer 4, thereby improving the performance of the optical device.

[0068] Furthermore, the sunscreen is carbon black, titanium oxide, phthalocyanine red, phthalocyanine blue or phthalocyanine green. It is understood that the above materials have good optical absorption performance; meanwhile, a uniform black coating with good absorption performance is usually formed on the surface of the transparent structure layer 3 by methods including but not limited to: sputtering, evaporation, spraying, etc.

[0069] Furthermore, the oligomer is epoxy acrylate, polyurethane acrylate or polyester acrylate. It is understandable that by using the oligomer of the above materials, it can play the role of thickening, enhancing the viscosity of the glue and enhancing the durability of the glue in the light-curing glue, which helps to adjust the performance of the glue to meet the needs of different applications.

[0070] The specific examples are further described below:

[0071] Testing equipment: Use TOPCON's BM-7AS to test the brightness of display screens at different viewing angles. The triangular microstructure of the controllable viewing angle high contrast film is attached in a direction parallel to the bottom edge of the display screen and directly attached to a 135-inch LED direct display screen for measurement.

[0072] Example 1

[0073] like Figure 5 As shown, the substrate layer 1 is 125μm PET, the diffusion layer 2 is an 85% haze coating, and the prism of the transparent structure layer 3 is an isosceles triangle structure with a vertex angle of 90°, a bottom width of 30μm, and a height of 15μm. The refractive index of the photocurable glue of the transparent structure layer 3 is 1.6. The black structure layer is arranged on the transparent structure layer 3 to fill and cover the prism structure. The total thickness of the black structure layer and the transparent structure layer 3 is 15μm; the refractive index of the photocurable glue of the black structure layer is 1.53.

[0074] At this time, after testing, the performance parameters of the high contrast film are: maximum brightness viewing angle is 0°, brightness is 131.2, contrast is 624.8, and applicable scenarios include but are not limited to: floor-standing TV walls in shopping malls, viewing distance 5-10M.

[0075] Example 2

[0076] The difference between Example 2 and Example 1 is that the isosceles triangle structure has a bottom width of 40 μm and a height of 20 μm, and the total thickness of the black structure layer and the transparent structure layer 3 is 20 μm.

[0077] At this time, after testing, the performance parameters of the high contrast film are: maximum brightness viewing angle is 0°, brightness is 122.4, contrast is 617.2, and applicable scenarios include but are not limited to: floor-standing TV walls in shopping malls, viewing distance 5-10M.

[0078] Example 3

[0079] like Figure 6 As shown, the difference between Example 3 and Example 1 is that the isosceles triangle structure has a bottom width of 50 μm and a height of 25 μm, and the total thickness of the black structure layer and the transparent structure layer 3 is 25 μm.

[0080] At this time, after testing, the performance parameters of the high contrast film are: maximum brightness viewing angle is 0°, brightness is 109.9, contrast is 610.5, and applicable scenarios include but are not limited to: floor-standing TV walls in shopping malls, viewing distance 5-10M.

[0081] Example 4

[0082] like Figure 7 As shown, the difference between Example 4 and Example 1 lies in the non-isosceles triangle structure with a vertex angle of 80°.

[0083] At this time, after testing, the performance parameters of the high contrast film are: maximum brightness viewing angle is 15°, brightness is 128.6, contrast is 621.3, and applicable scenarios include but are not limited to: hanging TV wall in the central control room, viewing distance 5-10M.

[0084] Example 5

[0085] The difference between Example 5 and Example 1 is that the non-isosceles triangle structure has a top angle of 60°, a bottom width of 30 μm, and a height of 25 μm, and the total thickness of the black structure layer and the transparent structure layer 3 is 25 μm.

[0086] At this time, after testing, the performance parameters of the high contrast film are: maximum brightness viewing angle of 5°, brightness of 108.5, contrast of 603.6, and applicable scenarios include but are not limited to: hanging TV wall in the central control room, viewing distance of 5-10M.

[0087] Example 6

[0088] like Figure 8 As shown, the difference between Example 6 and Example 1 is that the non-isosceles triangle structure has a top angle of 55°, a bottom width of 30 μm, and a height of 25 μm, and the total thickness of the black structure layer and the transparent structure layer 3 is 25 μm.

[0089] At this time, after testing, the performance parameters of the high contrast film are: maximum brightness viewing angle of 7°, brightness of 107.2, contrast of 603.4, and applicable scenarios include but are not limited to: hanging TV wall in the central control room, viewing distance of 5-10M.

[0090] Comparative Example 1

[0091] like Fig. 9 As shown, the difference between Comparative Example 1 and Example 1 is that the comparative example 1 has the same structure, but the black structure layer is not filled, and the pressure-sensitive adhesive layer 5 is directly attached to the top of the triangular structure.

[0092] At this time, after testing, the performance parameters of the diaphragm are: maximum brightness viewing angle is 0°, brightness is 156.6, and contrast is 570.3.

[0093] The results of various embodiments and comparative examples are shown in Table 1:

[0094]

[0095] From the above test results we can see that:

[0096] 1. It can be seen from Examples 1 to 3 that when the transparent structural layer 3 is an isosceles triangle, the maximum brightness viewing angle is located in the 0 degree direction of normal viewing, and compared with Comparative Example 1, a significant improvement in display contrast is achieved under the condition of losing limited brightness, and the product can be suitable for floor-standing application scenarios.

[0097] 2. It can be seen from Examples 4 to 6 that when the transparent structure layer 3 is a non-isosceles triangle, the highest brightness viewing angle will shift the short side of the triangle of the transparent structure layer 3 when the display presents a high contrast, and the product can be applied to hanging applications. And from the data, it can be seen that the brightness of the display is related to the thickness of the transparent structure layer 3, and the brightness tends to decrease as the thickness increases.

[0098] Therefore, according to the controllable viewing angle high contrast film of this embodiment, the optical viewing angle can be adjusted, the contrast can be increased, and the design requirements of the present utility model can be met.

[0099] The present application also relates to a polarizing plate, comprising the high contrast film as described above.

[0100] The present application also relates to a display device, comprising the polarizing plate as described above.

[0101] 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 high contrast film, characterized in that: include: A substrate layer (1); A diffusion layer (2) is arranged on one side of the substrate layer (1); a transparent structural layer (3) disposed on the substrate layer (1) at a side away from the diffusion layer (2); and A light-absorbing structural layer (4) filled and arranged on the transparent structural layer (3); The light absorbing structural layer (4) fills and flattens the surface of the transparent structural layer (3) on the side away from the diffusion layer (2).

2. The high contrast film according to claim 1, characterized in that: The transparent structural layer (3) is in the shape of an isosceles triangle; The transmitted light is distributed symmetrically on the left and right, and has the highest intensity at a viewing angle of 0 degrees.

3. The high contrast film according to claim 1, characterized in that: The transparent structural layer (3) is in the shape of a non-isosceles triangle; The transmitted light is distributed asymmetrically on the left and right, and has the highest intensity at a viewing angle deviating from 0 degrees.

4. The high contrast film according to claim 1, characterized in that: The total thickness of the light-absorbing structural layer (4) and the transparent structural layer (3) is 15-25 μm.

5. The high contrast film according to claim 1, characterized in that: The transparent structural layer (3) is a prism structure, the prism structure has a top angle of 55-90°, a bottom width of 30-50 μm, and a height of 15-25 μm.

6. The high contrast film according to claim 1, characterized in that: The transparent structural layer (3) is a first light-curing glue, and the refractive index of the first light-curing glue is in the range of 1.5-1.

7.

7. The high contrast film according to claim 1, characterized in that: The light absorbing structure layer (4) is a black structure layer, the black structure layer is a second light-curing glue, and the refractive index range of the second light-curing glue is 1.4-1.

55.

8. The high contrast film according to claim 1, characterized in that: The structure of the diffusion layer (2) is a volume diffusion structure, a surface diffusion structure or a microlens array structure.

9. A polarizing plate, characterized in that: The invention comprises the high contrast film as claimed in any one of claims 1 to 8.

10. A display device, characterized in that Comprising the polarizing plate as claimed in claim 9.

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