CN112669718A

CN112669718A - Optical film and LED display screen using same

Info

Publication number: CN112669718A
Application number: CN202011584350.9A
Authority: CN
Inventors: 王爱玲; 徐梦梦
Original assignee: Shenzhen Absen Optoelectronic Co Ltd
Current assignee: Shenzhen Absen Optoelectronic Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-04-16
Also published as: WO2022142425A1

Abstract

The application provides an optical film, which comprises an absorption film and a first antireflection layer which are stacked, wherein the absorption film is arranged close to the side of an LED lamp bead of a display module, the absorption film is provided with a plurality of meshes corresponding to the LED lamp bead of the display module, and the meshes penetrate through the thickness direction of the absorption film; the absorption film comprises a light absorption material, and the light absorption rate of the absorption film is 50% -100%. The application also provides an LED display screen using the optical film. This optical film can effectively reduce the reflection of ambient light, obviously promotes the contrast of LED display screen, and corresponds with LED lamp pearl based on the mesh on the high absorption film of absorptivity, and this absorption film can not obviously reduce the luminous luminance of LED display screen, makes the display screen can compromise high luminous luminance and high contrast.

Description

Optical film and LED display screen using same

Technical Field

The application relates to the technical field of LED display screens, in particular to an optical film for improving contrast and an LED display screen using the optical film.

Background

The Light Emitting Diode (LED) display screen has the advantages of high brightness, high luminous efficiency, bright color, high contrast, wide working temperature range, short response time, low energy consumption, etc., and is widely applied in the display field, such as the display of relatively common stock exchange and financial information, the display of airport flight dynamic information, the display of port and station passenger guidance information, the display of stadium information, the display of road traffic information, the display of scheduling command center information such as power scheduling and vehicle dynamic tracking, the display of business publicity information in the service field such as shopping mall, and the display of advertisement media products.

The LED display screen is generally formed by splicing a plurality of LED display screen box bodies, and each LED display screen box body comprises a box body frame and a plurality of display modules; wherein, every display module assembly includes components such as lamp plate, face guard and casing, and face guard and casing are located the both sides of lamp plate respectively, and the lamp plate includes PCB board (printed circuit board) and welds LED lamp pearl etc. at the PCB board openly through Surface Mounted Technology (SMT).

When the high-intensity ambient light irradiates the LED display screen, the more visible light is reflected to human eyes through the LED display screen, the more the human eyes can not clearly see the picture of the display screen, and the more obvious the contrast is reduced. In order to improve the contrast, a circular polarizing film is usually arranged on a light-emitting surface of a display screen in the industry, but the circular polarizing film can reduce the influence of ambient light on the contrast, and can also cause a large amount of light loss due to lower light transmittance, so that the brightness of the LED lamp beads of the LED display screen is obviously reduced.

Therefore, it is desirable to provide an optical film that can improve the contrast of a display panel without significantly reducing the brightness of the LED display panel.

Disclosure of Invention

In view of this, the application provides an optical film, and a display module and an LED display screen using the optical film, where the optical film is used for being disposed on a light-emitting surface of the display module, and includes a reflection reducing layer and an absorption film having a mesh structure, and the combination of the reflection reducing layer and the absorption film can effectively reduce reflection of ambient light, significantly improve contrast of the LED display screen under strong ambient light, and do not significantly reduce luminance of the LED display screen.

In a first aspect, the application provides an optical film, which includes an absorption film and a first antireflection layer, which are stacked, the optical film is arranged on an LED lamp bead side of a display module of an LED display screen, and the absorption film is close to the LED lamp bead side of the display module, wherein the absorption film has a plurality of meshes corresponding to the LED lamp beads of the display module, and the meshes penetrate through the thickness direction of the absorption film; the absorption film comprises a light absorption material, and the light absorption rate of the absorption film is 50% -100%.

Optionally, the absorption film has an absorbance of 50% to 80%. In this case, the absorption film has high absorbance, good film-forming properties, good toughness, and the like.

Optionally, the thickness of the absorber film is 10 μm to 100 μm. The thickness can ensure that the absorption film can absorb the light passing through the first antireflection layer, the effect of effectively enhancing the contrast is achieved, and the influence on the quality reliability of the absorption film due to the excessively thick thickness of the absorption film can be avoided.

Optionally, the light absorbing material is black, and the light absorbing material includes one or more of carbon black, carbon nanotubes, carbon fibers, and graphene. The black light absorption material can enable the absorption film to have a good light absorption effect. Further optionally, the light absorbing material has a particle size of 0.2 μm to 2 μm.

Optionally, the absorption film comprises a base material and the light absorption material distributed in the base material, and the mass of the light absorption material is 20% -60% of the mass of the absorption film. The light absorption material with proper content can enable the absorption film to have proper light absorption effect and good film forming property.

Optionally, the first antireflective layer has a light transmittance of greater than or equal to 90%; the thickness of the first antireflection layer is 0.1-10 μm. Therefore, the first antireflection layer can reduce the surface reflectivity of the optical film, and meanwhile, the light transmittance of external light cannot be reduced, and the light extraction efficiency is improved.

Optionally, the optical film further comprises a first transparent substrate layer between the first antireflection layer and the absorption film. The first transparent substrate layer can bear the first antireflection layer and also can bear the absorption film, and the preparation method of the absorption film with the mesh structure is widened.

Optionally, a first transparent adhesive layer is further disposed between the first transparent substrate layer and the absorption film.

Optionally, the optical film further comprises a second transparent substrate layer and a second antireflection layer, which are stacked, and the absorption film is located between the first transparent substrate layer and the second transparent substrate layer. The second antireflection layer can prevent light emitted by the LED display screen from being reflected by the inner side surface of the optical film, so that the light extraction efficiency is improved.

Optionally, scattering particles are further dispersed in the first transparent substrate layer. The first transparent substrate layer containing the scattering particles can have an anti-glare effect, and is beneficial to the watching of people on the display effect of the LED display screen and the health of human eyes. Optionally, the scattering particles have a particle size of 50 μm to 100 μm.

Optionally, at least one of the absorber film, the first transparent substrate layer, and the second transparent substrate layer is dispersed with scattering particles. The particle size of the scattering particles in each film layer should not exceed the thickness of the film layer.

The utility model provides an optical film that the first aspect of this application provided is arranged in setting up LED lamp pearl side of display module assembly in the LED display screen on, and LED lamp pearl is kept away from to first antireflection layer wherein, first antireflection layer can effectively reduce the reflectivity on this optical film surface, but the absorption film that has mesh structure fully absorbs a part ambient light and further reduce the reverberation after passing through first antireflection layer, under the combined action of the two, it is high to reduce the background luminance that ambient light reflection caused more effectively, thereby improve the contrast of display screen, especially the contrast of LED display screen under strong ambient light. In addition, the absorption film with the mesh structure does not cover the LED lamp beads, the light-emitting efficiency of the display module can not be influenced, the light-emitting brightness of the LED display screen can not be reduced, and then the high light-emitting brightness and the high contrast ratio can be considered for the display screen.

The second aspect of the application still provides a LED display screen, the LED display screen forms through a plurality of display module assembly concatenations, be provided with as this first aspect of the application on the LED lamp pearl side of display module assembly the blooming.

The LED display screen with the optical film can give consideration to high brightness and high contrast.

Drawings

FIG. 1 is a schematic structural diagram of an LED display screen provided in an embodiment of the present application;

FIG. 2a is a schematic structural diagram (front view) of a display module of an LED display screen;

FIG. 2b is a top view of the display module;

FIG. 3a is a schematic diagram of a structure of an optical film with improved contrast ratio according to some embodiments of the present disclosure;

FIG. 3b is a top view of an absorber film according to some embodiments of the present application;

FIGS. 4 a-4 c are schematic structural views of a display module using the optical film of FIG. 3 a;

FIGS. 5 a-5 c are schematic diagrams of structures of contrast-improving optical films according to further embodiments of the present disclosure;

fig. 6 is a schematic structural diagram of a display module using the optical film in fig. 5c according to the present application.

Description of reference numerals: the LED display screen comprises an LED display screen 1000, a display box body 200, an existing display module 100', an optical film 3, a display module 100 with the optical film, a lamp panel 11, a PCB 10, LED lamp beads 20, packaging glue 12, an absorption film 30, meshes 30a, a first antireflection layer 31, a first transparent substrate layer 32, a transparent adhesive layer 33, a second transparent substrate layer 35, a second antireflection layer 36, a glue layer 4, a frame 5 and an air gap 6.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application.

As shown in fig. 1, the structure of the LED display screen 1000 will be described first. Generally, the LED display screen 1000 is formed by splicing a plurality of display boxes 200, each display box 200 includes a box frame (not shown in fig. 1) and a plurality of display modules 100 ', and the plurality of display modules 100' are regularly fixed on the box frame to form a complete display box 200. As shown in fig. 1, the display screen 1000 includes two display cases 200, each display case 200 includes a case frame and four display modules 100 ', and the case frame of each display case 200 is fixed to the back of the display module 100'.

Referring to fig. 2a, each display module 100' includes a lamp panel 11, and the lamp panel 11 includes a PCB (printed circuit board) 10 and a plurality of LED lamp beads 20 disposed on the PCB 10 at intervals. The light emitting surface of the display module 100' is a side surface on which the LED beads are disposed (see the arrow in fig. 2 a), and may also be referred to as the front surface of the lamp panel 11 or the PCB 10. The plurality of LED beads 20 may be arranged on the PCB 10 in an array as shown in fig. 2b, or may be arranged in other ways as needed. Each display module 100' may further include components such as a bottom shell, where the bottom shell is located at the back of the lamp panel 11 (i.e., at a side where no lamp bead is disposed). Of course, the back of the PCB board 10 is further provided with a driving circuit and the like to control the orderly on/off of the lamp beads.

The optical film capable of improving the contrast is mainly added on the display module. The optical film, and a display module and an LED display screen using the optical film will be described in detail below.

Fig. 3a is a schematic structural view of an optical film capable of improving contrast according to some embodiments of the present disclosure, fig. 3b is a top view of an absorption film in an embodiment of the present disclosure, and fig. 4a to 4c are schematic structural views of a display module using the optical film in fig. 3 a. Referring to the drawings, the display module 100 includes a lamp panel 11, the lamp panel 11 includes a PCB 10 and a plurality of LED beads 20 disposed on the PCB 10 at intervals, an optical film 3 for improving contrast is disposed on a side of the LED beads of the display module 100, the optical film 3 includes an absorption film 30 and a first antireflection layer 31 disposed in a stacked manner, wherein the absorption film 30 is close to the side of the LED beads of the display module 100, the absorption film 30 has a plurality of meshes 30a corresponding to the LED beads 20 of the LED display module, and the meshes 30a penetrate through the thickness of the absorption film 30; the absorption film 30 includes a light absorption material, and the absorption rate of the absorption film 30 is 50% to 100%.

In this application, LED lamp pearl 20 is kept away from to first antireflection layer 31, be located the outside of blooming 3, first antireflection layer 31 can effectively reduce the reflectivity on blooming 3 surface, absorption film 30 that has a plurality of meshs 30a can fully absorb a part of ambient light that passes through first antireflection layer 31, further reduce the reverberation, under the combined action of the two, it is high to reduce the background luminance that ambient light reflection caused more effectively, thereby improve the contrast of display screen, especially the contrast of LED display screen under strong ambient light. In addition, because the mesh 30a of absorption film 30 is corresponding with LED lamp pearl, absorption film 30 does not cover LED lamp pearl, can not influence display module's luminous efficacy, can not reduce the luminous luminance of LED display screen, and then makes the display screen can compromise high luminous luminance and high contrast.

Optionally, the light transmittance of the first antireflection layer 31 is greater than or equal to 90%; the thickness of the first antireflection layer 31 is 0.1 μm to 10 μm. Thus, the first antireflection layer 31 reduces the surface reflectivity of the optical film 3, and also does not reduce the transmittance of external light, thereby improving the light extraction efficiency. Specifically, the thickness of the first antireflection layer 31 may be 0.2 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 5 μm, 8 μm, or 10 μm. In some embodiments, the material of the first antireflection layer 31 may be one or more of magnesium fluoride, titanium dioxide, silicon dioxide, aluminum oxide, zirconium dioxide, zinc selenide, zinc sulfide, vinyl silsesquioxane, and silicon oxynitride (SiON), and preferably, two or more of these materials are stacked. For example, the first antireflection layer 31 may be a stack of a silicon dioxide layer and a magnesium fluoride layer. In other embodiments of the present application, the first antireflection layer 31 may be a moth-eye film having a graded-index effect.

The plurality of meshes 30a are provided at intervals on the absorbent film 3, and as can be seen from "the meshes 30a penetrate the thickness of the absorbent film 30", the meshes 30a are through holes, and the depth of the meshes 30a is equal to the thickness of the absorbent film 3. As can be seen from the comparison between FIG. 3b and FIG. 2b, the arrangement of the meshes 30a is the same as that of the LED lamp beads. "mesh 30a corresponds to LED bead 20 a" can be understood as: when placing this blooming 3 in the top of lamp plate 11, the orthographic projection of LED lamp pearl 20 on absorbing film 30 falls into corresponding mesh 30 a. In other words, the projection of the absorption film 30 on the PCB board 10 does not cover any one of the LED lamp beads 20. Optionally, the size of the mesh 30a is larger than or equal to the size of the LED lamp beads 20, so that the absorption film 30 with the mesh 30a does not cover the LED lamp beads 20, and further the luminous intensity of the display module is not significantly reduced. Preferably, the size of the mesh 30a is equal to the size of the LED lamp beads 20, so that the orthographic projection of the LED lamp beads 20 on the absorption film 30 completely coincides with the mesh 30 a.

In the present embodiment, the absorption rate of the absorption film 30 is 50% to 100%, and specifically, may be 60%, 70%, 80%, 85%, 90%, or 95%. In some embodiments of the present application, the absorption rate of the absorption film 30 may be 50% to 80%. Thus, the absorption film 30 has high light absorption rate, good film forming property, good toughness and the like.

In the present embodiment, the thickness of the absorption film 30 may be 10 μm to 100 μm. The thickness can prevent the absorption film 30 from being unable to effectively absorb the light passing through the first antireflection layer 31 due to the excessively thin thickness, so as to achieve the effect of effectively enhancing the contrast ratio, and can also prevent the absorption film 30 from affecting the quality reliability (such as easy cracking and uneven surface) of the absorption film 30 due to the excessively thick thickness. In some embodiments, the thickness of the absorber film 30 may be 15 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, or 90 μm.

The light absorbing material contained in the absorbing film 30 is black. For example, the light absorbing material may include one or more of carbon black, carbon nanotubes, carbon fibers, graphene, and the like, but is not limited thereto. Optionally, the light absorbing material has a particle size of 0.2 μm to 2 μm. Thus, the absorption film 30 can be made to have suitable light absorption without affecting the quality reliability of the film layer. In some embodiments of the present application, the material of construction of the absorber film 30 may include a matrix material and a light absorbing material distributed in the matrix material. Further, the light absorbing material may be 20% to 60% by mass of the absorbing film 30. The light absorbing material with a proper content can enable the absorbing film 30 to have a proper light absorbing effect, and meanwhile, good film forming performance of the absorbing film is guaranteed.

Specifically, the base material may include one or more of a non-photosensitive resin material and a photosensitive resin material. Among them, the non-photosensitive resin material may be one or more of PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), PC (polycarbonate), PI (polyimide), PVC (vinyl chloride), PP (polypropylene), OPP (oriented polypropylene), epoxy resin, and the like. Examples of the photosensitive resin material include epoxy acrylic resins and urethane resin oligomers having a reactive acrylic functional group.

The optical film 3 shown in fig. 3a can be prepared by the following method: s10, coating the mixed slurry containing the light absorbing material and the matrix material on one side surface of the substrate, and drying to form an absorbing layer; s20, forming a first antireflection layer on the absorption layer by evaporation, sputtering or coating; and S30, removing the substrate to obtain an absorption layer and a first antireflection layer which are stacked, and carrying out laser engraving, plasma etching and the like on the surface of one side of the absorption layer, which is far away from the antireflection layer, so as to form the absorption film with a plurality of meshes which are arranged at intervals. In certain embodiments of the present application, step S20 can be omitted if a separate absorbent film 30 is desired, as shown in fig. 3 b.

When the base material contains a photosensitive resin, the absorber film 30 can be obtained by coating, baking, mask exposure, development, or the like. Specifically, the optical film 3 shown in fig. 3a can also be prepared by the following photolithography process: s1, coating photosensitive slurry containing light absorbing material and base material (such as photoresist) containing photosensitive resin on one side surface of the substrate, baking to form an absorbing layer; s2, forming a first antireflection layer 31 on the absorption layer by evaporation, sputtering or coating; s3, removing the substrate, exposing the side surface of the absorbing layer not provided with the first anti-reflection layer with a mask plate to cure the exposed area, removing the mask plate, and developing the exposed coating with a developing solution to obtain the desired patterned absorbing film 30, thereby completing the fabrication of the optical film 3 shown in fig. 3 a.

If the photoresist is positive photoresist, when a mask plate is used for exposure, the exposed area is an area corresponding to the LED lamp beads one by one, and can be dissolved by a developing solution after illumination; if the photoresist is negative photoresist, when the mask plate is used for exposure, the exposed area corresponds to the gap between the LED lamp beads and is not dissolved by the developing solution after illumination. After the development, a post-baking treatment may be performed to improve mechanical properties such as hardness of the absorption film 30. Further, in order to enhance the photo-curing effect, the base material in step S1 may further include a sensitizing pigment, a dispersant, a photoinitiator, and the like. Optionally, the photosensitive paste in step S1 may further include an ultraviolet resistant agent to inhibit and retard photo-aging of the absorbing film 30 by ultraviolet rays. In certain embodiments of the present application, step S2 can be omitted if a separate absorbent film 30 is desired, as shown in fig. 3 b.

As can be seen from fig. 4a to 4c, the optical film 3 shown in fig. 3a can be fixed on the display module 100 by gluing and/or frame-attaching. In fig. 4a, the optical film 3 is fixed on the display module 100 by gluing, and a glue layer 4 is disposed between the light-emitting surface of the display module 100 and the absorption film 30 of the optical film 3. Glue film 4 covers one side surface that PCB board 10 was equipped with LED lamp pearl 20 (i.e. lamp plate 11's lamp pearl side surface or play plain noodles), and glue film 4 covers absorbing film 30 and the mesh on it. The glue layer 4 can be coated on the absorption film 30 in advance and then is pressed with the lamp panel 11; the glue layer 4 can also be coated on the lamp bead side of the lamp panel 11 in advance and then pressed together with the optical film 3; alternatively, the absorption film 30 and the lamp panel 11 may be coated with the glue layer 4 and then pressed together. In fig. 4b, the optical film 3 is fixed on the display module 100 by frame adhesion, and the optical film 3 and the LED display module are fixed by the frame 5. The optical film 3 and the LED display module may be stacked together and then pressed and fixed by the bezel 5. In fig. 4c, the optical film 3 is fixed to the display module 100 by gluing and frame bonding.

In other embodiments of the present application, referring to fig. 5a, the optical film 3 applied to the display module 100 further includes a first transparent substrate layer 32, and the first transparent substrate layer 32 is located between the first antireflection layer 31 and the absorption film 30 having the mesh 30 a. At this time, the first transparent substrate layer 32 can serve as a carrier for supporting the first antireflection layer 31 and can also support the absorption film 30, thereby widening the preparation method of the absorption film having a mesh structure. Specifically, the optical film shown in fig. 5a may be prepared by: firstly, preparing a first antireflection layer 31 on one side surface of a first transparent substrate layer 32 in a vapor deposition, sputtering or coating mode; then, a patterned absorbing film 30 is formed on the other side surface of the first transparent substrate layer 32 by the above-mentioned photolithography process (in this case, the composition used for coating should contain a photosensitive resin), or a mesh-structured absorbing film 30 is formed by a coating-laser engraving process, or the mesh-structured absorbing film 30 is directly prepared by spraying a slurry containing a light absorbing material, or the separate absorbing films 30 are directly heat-pressed.

Optionally, the first transparent substrate layer 32 may also have scattering particles dispersed therein, such as one or more of silica, barium sulfate, calcium carbonate, diatomaceous earth, kaolin, talc, and the like. The scattering particles have a refractive index different from the material of the transparent substrate layer. The transparent substrate layer 32 containing the scattering particles has an anti-glare effect, reduces the undesirable lighting phenomenon of glare, and is beneficial to the watching of the display effect of the LED display screen by people and the health of human eyes; the reflection of ambient light can be further reduced. Optionally, the particle diameter of the scattering particles is in the range of 50 μm to 100 μm, which can provide the first transparent substrate layer 32 with some anti-glare effect without affecting the light transmittance and the integrity of the film layer. Further, the light transmittance of the transparent substrate layer 32 containing the scattering particles should be 80% or more. Similarly, in other embodiments of the present application, scattering particles may also be dispersed in the absorber film 30.

In other embodiments of the present application, referring to fig. 5b, a transparent adhesive layer 33 is further disposed between the first transparent substrate layer 32 and the patterned absorbing film 30. At this time, the optical film 3 includes an absorption film 30, a transparent adhesive layer 33, a first transparent base layer 32, and a first antireflection layer 31, which are stacked. The absorbing film 30 in fig. 5b should be a separate absorbing film as shown in fig. 3 b. The optical film shown in fig. 5b can be prepared by the following method: the first antireflection layer 31 is prepared on one side surface of the first transparent substrate layer 32 by evaporation, sputtering or coating, and the other side surface of the first transparent substrate layer 32, on which the first antireflection layer 31 is not disposed, and the independent absorption film 30 are connected together by the transparent adhesive layer 33. Among them, the transparent adhesive layer 33 may be previously coated on the absorption film 30 and/or the other side surface of the transparent base layer 32 where the first antireflection layer 31 is not disposed. Alternatively, the transparent adhesive layer 33 has a thickness of 0.1 μm to 30 μm. Specifically, it may include, but is not limited to, 0.5. mu.m, 1. mu.m, 5. mu.m, 8. mu.m, 10. mu.m, 15. mu.m, 20. mu.m, or 25. mu.m. In some embodiments, the transparent adhesive layer 33 has a thickness of 1 μm to 12 μm. The transparent adhesive layer 33 can be made of pressure-sensitive adhesive, and the light transmittance is more than or equal to 80%.

In another embodiment of the present application, in the optical film shown in fig. 5a and 5b, a laminated structure of the second transparent base layer 35 and the second antireflection layer 36 may be provided below the absorption film 30, and the second transparent base layer 35 may be close to the absorption film 30. A specific example can be seen in fig. 5 c. In fig. 5c, the contrast-improving optical film 3 includes a first antireflection layer 31, a first transparent base layer 32, an optical film 30, a second transparent base layer 35, and a second antireflection layer 36, which are sequentially stacked. The second antireflection layer 36 is added on one side of the optical film close to the display module, so that light emitted by the LED display screen can be prevented from being reflected by the inner side surface of the optical film, and the light emitting efficiency of the LED display screen is improved.

The above description regarding the thickness, light transmittance, material, and the like of the first transparent base layer 32 also applies to the second transparent base layer 35 herein. The above description about the thickness, light transmittance, material, and the like of the first antireflection layer 31 also applies to the second antireflection layer 36 here. The optical film shown in fig. 5c may be formed by directly laminating the second transparent substrate layer 35 with the second antireflection layer 3 on the side of the absorption film 30 of the optical film shown in fig. 5a, or by connecting the two layers through a transparent adhesive layer.

It should be noted that, when the optical film shown in fig. 5a and 5b is applied to a display module of an LED display screen, the optical film may be fixed on the display module by gluing and/or frame attaching, which may be specifically shown in fig. 4a to 4 c. When the optical film with the second antireflection layer is used in a display module, a gap needs to be left between the second antireflection layer and the light-emitting surface of the display module, so as to prevent the second antireflection layer 36 from exerting an antireflection effect.

Specifically, fig. 6 is a schematic structural diagram of a display module using the optical film in fig. 5 c. In fig. 6, the display module is a COB or GOB package with glue filled on the surface, the side surface of the lamp bead of the lamp panel 11 is covered with the package glue 12, the optical film 3 shown in fig. 5c is located on the light emitting surface of the display module, and the first antireflection layer 31 is far away from the light emitting surface of the display module. The optical film 3 and the display module are fixed by the frame 5, and a certain air gap 6 is left between the second antireflection layer 36 and the light-emitting surface of the LED display module. The second antireflection layer 36 on the inner side of the optical film 3 is matched with the air gap 6, so that part of the ambient light can be prevented from being reflected by the surface of the display module after penetrating through the optical film 3, and the reflection of the ambient light can be further reduced.

In addition, this application embodiment still provides an LED display screen, the LED display screen forms through a plurality of display module group concatenations, is provided with on every display module group's the play plain noodles (promptly, LED lamp pearl side) and implements foretell any kind of blooming that can improve the contrast like this application.

Be equipped with above-mentioned optical film on the light-emitting face of the display module assembly of LED display screen, and LED lamp pearl is kept away from to first antireflection layer wherein, first antireflection layer can effectively reduce the reflectivity on this optical film surface, the absorption film that has the mesh structure can be fully absorbed a part ambient light after passing through first antireflection layer and further reduce the reverberation, under the combined action of the two, it is high to reduce the background luminance that ambient light reflection caused more effectively, thereby improve the contrast of display screen, and can not reduce the luminous luminance of LED display screen, and then make the display screen can compromise high luminous luminance and high contrast.

The above examples merely represent some exemplary embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The optical film is characterized by comprising an absorption film and a first antireflection layer which are arranged in a stacked mode, wherein the optical film is arranged on the LED lamp bead side of a display module of an LED display screen, and the absorption film is close to the LED lamp bead side of the display module; the absorption film is provided with a plurality of meshes corresponding to the LED lamp beads of the display module, and the meshes penetrate through the thickness direction of the absorption film; the absorption film comprises a light absorption material, and the light absorption rate of the absorption film is 50% -100%.

2. The optical film of claim 1, wherein the absorbing film has a thickness of 10 μm to 100 μm.

3. The optical film of claim 1 or 2, wherein the light absorbing material is black and has a particle size of 0.2 μ ι η to 2 μ ι η.

4. The optical film of claim 1, wherein the absorbing film comprises a matrix material and the light absorbing material is distributed in the matrix material, and the mass of the light absorbing material is 20% to 60% of the mass of the absorbing film.

5. The optical film of claim 1, wherein the first antireflective layer has a light transmittance of greater than or equal to 90%; the thickness of the first antireflection layer is 0.1-10 μm.

6. The optical film of any one of claims 1-5, further comprising a first transparent substrate layer between the first antireflection layer and the absorber film.

7. The optical film of claim 6, wherein a transparent adhesive layer is further disposed between the first transparent substrate layer and the absorbing film.

8. The optical film of claim 6 or 7, wherein the first transparent substrate layer further comprises scattering particles dispersed therein.

9. The optical film of any of claims 6-8, further comprising a second transparent substrate layer and a second antireflective layer disposed in a stack, and wherein the absorber film is positioned between the first transparent substrate layer and the second transparent substrate layer.

10. An LED display screen, comprising a plurality of display modules, wherein the optical film of any one of claims 1-9 is arranged on the LED bead side of the display modules.