Optical film assembly, backlight module and display device

Abstract

The embodiment of the utility model provides an optical film assembly, a backlight module and a display device, and the optical film assembly comprises an optical film which comprises a first prism layer; the polaroid comprises a body diffusion layer, air holes are formed in the body diffusion layer so as to reflect and refract light rays, and at least one side face of the body diffusion layer is a flat surface so as to be tightly connected with the first prism layer. The air holes in the diffusion layer are used in the polaroid to diffuse light rays, existing diffusion coating particles are replaced, the particles can be prevented from scratching the prism layer, and therefore the probability that the optical film is abraded is reduced, optical devices are reduced on the basis that the optical index requirement of the polaroid is guaranteed, and the thickness of the backlight module is reduced.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular relates to an optical film assembly, a backlight module and a display device. Background Art

[0002] In liquid crystal display technology, liquid crystal boxes have been produced as a single product in liquid crystal panel factories. The upper polarizer and the lower polarizer are mounted on the basis of the preparation of the glass monomer. An optical film is usually provided in the backlight module to improve the luminous effect of the backlight source. Since the lower polarizer and the optical film are made by different manufacturers, there is no setting method for the intermediate connecting layer. In the related technology, the prism structure in the optical film is in direct contact with the lower polarizer, which easily leads to the problem of wear of the optical film. Utility Model Content

[0003] The embodiments of the present application provide an optical film assembly, a backlight module and a display device, which can reduce the probability of the optical film being scratched and ensure the optical index requirements of the polarizer.

[0004] In a first aspect, an embodiment of the present application provides an optical film assembly, comprising:

[0005] An optical film including a first prism layer;

[0006] The polarizer comprises a body diffusion layer, wherein the body diffusion layer has pores inside to reflect and refract light, and at least one side surface of the body diffusion layer is a flat surface to be closely connected with the first prism layer.

[0007] Optionally, the haze of the bulk diffusion layer ranges from 5% to 70%.

[0008] Optionally, the transmittance of the body diffusion layer ranges from 30% to 90%.

[0009] Optionally, the thickness of the bulk diffusion layer is 0.2 to 0.5 of the thickness of the polarizer.

[0010] Optionally, the material of the bulk diffusion layer includes nano-silicon dioxide, nano-aluminum oxide, glass micro-beads and polyethylene terephthalate resin.

[0011] Optionally, the overall thickness of the polarizer and the optical film ranges from 250 microns to 400 microns.

[0012] Optionally, the polarizer further includes:

[0013] A polarizing functional layer is arranged on a side of the body diffusion layer away from the optical film;

[0014] The support layer is arranged on a side of the polarization functional layer away from the body diffusion layer.

[0015] Optionally, the optical film further includes:

[0016] A first substrate layer is disposed on a side of the first prism layer away from the polarizer;

[0017] A second prism layer is disposed on a side of the first substrate layer away from the first prism layer;

[0018] The second substrate layer is disposed on a side of the second prism layer away from the first prism layer.

[0019] In a second aspect, an embodiment of the present application further provides a backlight module, comprising an optical film assembly as described in any one of the above items.

[0020] In a third aspect, an embodiment of the present application further provides a display device, comprising the backlight module as described above.

[0021] In the optical film assembly, backlight module and display device of the embodiments of the present application, the pores in the body diffusion layer in the polarizer are used to diffuse the light, replacing the existing diffusion coating particles. This can avoid scratching the prism layer by the particles, thereby reducing the probability of the optical film being worn. In addition, the optical devices are reduced while ensuring the optical index requirements of the polarizer, which is beneficial to reducing the thickness of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0023] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0024] Figure 1 A first structural schematic diagram of a display device provided in an embodiment of the present application.

[0025] Figure 2 A second structural schematic diagram of the display device provided in an embodiment of the present application.

[0026] Figure 3 This is a schematic diagram of the first structure of the optical film assembly provided in an embodiment of the present application.

[0027] Figure 4 A schematic diagram of the structure of an optical film provided in an embodiment of the present application.

[0028] Figure 5This is a schematic diagram of the structure of the polarizer provided in an embodiment of the present application.

[0029] Figure 6 A second structural schematic diagram of the optical film assembly provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely 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, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0031] See also Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of a first structure of a display device provided in an embodiment of the present application. Figure 2 A second structural diagram of a display device provided in an embodiment of the present application. An embodiment of the present application provides a display device 1, which may be a device with a display function such as a mobile phone, a television, a computer, or a vehicle-mounted video device.

[0032] The embodiments of the present application are described using a liquid crystal type display device as an example. The liquid crystal display utilizes the photoelectric effect of its liquid crystal under external voltage control, and utilizes the refractive properties of the liquid crystal molecules to utilize their ability to rotate light to obtain visible optical contrast changes, thereby achieving its display purpose.

[0033] Exemplarily, the display device 1 includes a backlight module 10 and a display screen 20. The backlight module 10 provides backlight for the display screen 20. The display screen 20 is generally constructed by sandwiching a liquid crystal layer between an array substrate and a color film substrate. The backlight module 10 cooperates with the display screen 20 to realize picture display.

[0034] Among them, in liquid crystal display technology, liquid crystal boxes have been produced as a single product in liquid crystal panel factories. The upper polarizer and the lower polarizer are mounted on the basis of the preparation of the glass monomer. An optical film is usually provided in the backlight module to improve the luminous effect of the backlight source. Since the lower polarizer and the optical film are made by different manufacturers, there is no setting method for the intermediate connecting layer. In the related technology, the prism structure in the optical film is in direct contact with the lower polarizer, which easily leads to the problem of wear of the optical film.

[0035] In order to reduce the occurrence of the above situation, the embodiment of the present application improves the backlight module.

[0036] Please combine Figure 1 and Figure 2 Also see Figure 3 As shown, Figure 3 The first structural schematic diagram of the optical film assembly provided in the embodiment of the present application. Exemplarily, the backlight module 10 includes the optical film assembly 100. Of course, the backlight module 10 also includes other components such as backlight source lamp beads, backboard, etc., which are not specifically limited here and should not be understood as limiting the backlight module 10.

[0037] The optical film assembly 100 includes an optical film 110 and a polarizer 120. The optical film 110 is an optical device for adjusting the backlight source, such as adjusting the brightness and light uniformity of the backlight source. The polarizer 120 can be understood as a lower polarizer. The imaging of a liquid crystal display must rely on polarized light. Usually, two polarizers are set on both sides of the liquid crystal close to the liquid crystal glass. These two polarizers are also called upper polarizers and lower polarizers, which are distinguished according to different positions.

[0038] Exemplarily, the optical film 110 includes a first prism layer 111. The polarizer 120 includes a body diffusion layer 121, and the body diffusion layer 121 has pores 122 inside to reflect and refract light. At least one side of the body diffusion layer 121 is a flat surface to be tightly connected with the first prism layer 111. Tight connection can be understood as the two being connected in a fitting manner, or in a close connection, that is, there is no gap or a state of almost no gap between the body diffusion layer 121 and the first prism layer 111. It can be understood that compared with the spherical particles on the surface of the polarizer in the prior art, the embodiment of the present application transfers the component for diffusing light to the inside of the body diffusion layer 121, that is, the pores 122 can diffuse the light, thereby eliminating the spherical particles on the surface of the polarizer, which reduces the risk of scratching the optical film 110 on the one hand, and can also reduce the overall thickness of the polarizer 120 and the optical film 110 on the other hand.

[0039] At least one side surface of the body diffusion layer 121 is a flat surface, so that the polarizer 120 and the optical film 110 are closely arranged, and the overall thickness of the polarizer 120 and the optical film 110 can be further reduced. To facilitate connection, the flat surface of the body diffusion layer 121 is sticky, and the sticky surface of the body diffusion layer 121 is bonded to the first prism layer 111, which can prevent the polarizer 120 and the optical film 110 from sliding against each other, and further ensure the optical performance of the polarizer 120 and the optical film 110.

[0040] It should be noted that in the related art, the optical film and the lower polarizer are prone to prism scratches during the module construction process, mainly because the surface of the protective layer in the lower polarizer has a 5% diffusion requirement, and there are spherical particles on the surface, which easily cause prism scratches on the surface of the brightening film in the optical film. Therefore, in order to improve the above situation, the embodiment of the present application uses a body diffusion layer 121 to replace the protective layer with certain diffusion requirements, and makes at least one side of the body diffusion layer 121 a flat surface to avoid scratches and wear of the optical film 110 by particles, and to ensure the optical effect of the polarizer 120.

[0041] Among them, in the related art, optical films and polarizers are usually produced by different manufacturers, and it is easy to ignore the problems caused by the combination of optical films and polarizers. The embodiment of the present application takes into account the problems that are easy to occur when the optical film 110 and the polarizer 120 are combined, so the polarizer 120 is improved. In the actual production process, the optical film 110 and the polarizer 120 can be laminated and then assembled with the liquid crystal glass. At this time, for the convenience of explanation, the optical film assembly 100 composed of the optical film 110 and the polarizer 120 is artificially divided into a part of the backlight module 10, but it should not be understood as a limitation on the optical film assembly 100.

[0042] In some embodiments, the optical film 110 and the polarizer 120 may also be manufactured by different manufacturers, that is, the optical film 110 is attached to the liquid crystal glass and then assembled with the polarizer 120 .

[0043] In the optical film assembly 100 and the backlight module 10 provided in the embodiment of the present application, the pores 122 in the body diffusion layer 121 in the polarizer 120 are used to diffuse the light, replacing the existing diffusion coating particles. This can avoid scratching the prism layer by the particles, thereby reducing the probability of the optical film 110 being worn. In addition, the optical devices are reduced on the basis of ensuring the optical index requirements of the polarizer 120, which is conducive to thinning the thickness of the backlight module 10.

[0044] Exemplarily, the body diffusion layer 121 is transparent, for example, the transmittance range of the body diffusion layer 121 is 30% to 90%, including endpoint values ​​30% and 90%, so that the backlight source of the backlight module 10 can pass through the body diffusion layer 121, or reduce the influence of the body diffusion layer 121 on the transmittance of the backlight source.

[0045] Among them, the body diffusion layer 121 has certain haze requirements. The haze is the percentage of the transmitted light intensity that deviates from the incident light by more than 2.5° to the total transmitted light intensity. The larger the haze, the lower the gloss and transparency of the film, especially the imaging degree. Haze is an important parameter for the optical transparency of transparent or translucent materials. The haze of the polarizer 120 is generally around 5%. In order to better solve the optical problems in the diffusion and brightening prism, the haze range of the body diffusion layer 121 is set to 5% to 70%. Preferably, the haze range of the body diffusion layer 121 is 5% to 50%. It can be understood that haze is another parameter that represents the degree of transparency. The embodiment of the present application sets a larger range for the haze of the body diffusion layer 121. It can be set specifically according to the requirements of the backlight module 10, or optimized according to process limitations, so as to meet the optical requirements of the polarizer 120. For example, when the haze of the body diffusion layer 121 is 5%, the body diffusion layer 121 has good transparency. If the manufacturing process can meet the requirements, the body diffusion layer 121 will basically not affect the transmittance of the backlight source. When the haze of the body diffusion layer 121 is 30%, the transparency of the body diffusion layer 121 is slightly poor, but the diffusion is easier to meet the optical requirements, and the manufacturing is more convenient. It can take into account the manufacturing process and transmittance requirements, and can also meet the light transmission requirements of the backlight source. When the haze of the body diffusion layer 121 is 50%, the transparency of the body diffusion layer 121 is poor, but the diffusion is good, and the manufacturing process is simple, which can speed up the manufacturing process of the optical film assembly 100 and improve production efficiency.

[0046] Exemplarily, the material of the body diffusion layer 121 includes nano-silicon dioxide, nano-alumina, glass micro-beads and polyethylene terephthalate (PET) resin. The preparation process of the body diffusion layer 121 can be: nano-silicon dioxide, nano-alumina, glass micro-beads or hollow glass micro-beads and other micro-nano particles are uniformly dispersed in the PET resin, and the PET and the master batch containing nano-particles are added to the inverted screw extruder according to a certain formula, and further heated and melted, and after passing through the extrusion die head, the body diffusion layer 121 is prepared by biaxial stretching. Due to the stretching of PET, there is no corresponding change in the nano-particles in the resin system, and air bubbles are formed between the PET and the nano-particles, and finally a PET film with air bubbles, that is, the body diffusion layer 121, is prepared.

[0047] In the embodiment of the present application, the body diffusion layer 121 is applied as a protective layer of the polarizer 120 , and at the same time, the polarizer 120 and the optical film 110 are compounded in a composite form on the prism surface of the optical film 110 , which not only solves the abrasion problem of the optical film 110 , but also compounds the optical film 110 and the polarizer 120 into a functional film, which is beneficial to reduce the thickness of the backlight module 10 .

[0048] Among them, for the mounting equipment suitable for the polarizer 120, the thickness of the corresponding polarizer 120 is about 200 microns. The thickness of the body diffusion layer 121 accounts for 0.2 to 0.5 of the thickness of the polarizer 120, that is, the thickness of the body diffusion layer 121 ranges from 40 microns to 100 microns, preferably from 50 microns to 80 microns, so that the optical requirements of the polarizer 120 can be met and the polarizer 120 can be conveniently processed using the mounting equipment.

[0049] The thickness of the optical film 110 is in the range of 100 microns to 200 microns, and thus the overall thickness of the polarizer 120 and the optical film 110 is in the range of 250 microns to 400 microns. It is understandable that since there is no need to add a device specifically for bonding, the number of optical film assemblies 100 can be reduced, which is conducive to reducing the thickness of the optical film assembly 100 and the backlight module 10.

[0050] Please combine Figures 1 to 3 Also see Figure 4 As shown, Figure 4 A schematic diagram of the structure of an optical film provided in an embodiment of the present application. It should be noted that the optical film 110 in the embodiment of the present application may be in the form of UPOP, that is, a combination of upper and lower brightness enhancement films. Exemplarily, the optical film 110 also includes a first substrate layer 112, a second prism layer 113, and a second substrate layer 114. The first substrate layer 112 is disposed on the side of the first prism layer 111 away from the polarizer 120, and the first substrate layer 112 and the first prism layer 111 constitute a brightness enhancement film. Similarly, the second prism layer 113 and the second substrate layer 114 constitute another brightness enhancement film, the second prism layer 113 is disposed on the side of the first substrate layer 112 away from the first prism layer 111, and the second substrate layer 114 is disposed on the side of the second prism layer 113 away from the first prism layer 111.

[0051] Please combine Figures 1 to 4 Also see Figure 5 and Figure 6 As shown, Figure 5 This is a schematic diagram of the structure of the polarizer provided in the embodiment of the present application. Figure 6 A second structural schematic diagram of an optical film assembly provided in an embodiment of the present application. Exemplarily, other structural components of the polarizer 120 may be: the polarizer 120 further includes a polarizing functional layer 123 and a supporting layer 124. The polarizing functional layer 123 may also be referred to as a PVA layer, the main material of which is polyvinyl alcohol, and the polarizing functional layer 123 is disposed on the side of the body diffusion layer 121 away from the optical film 110. The supporting layer 124 may also be referred to as a TAC layer, the main material of which is triacetyl cellulose, and the supporting layer 124 is disposed on the side of the polarizing functional layer 123 away from the body diffusion layer 121.

[0052] In the optical film assembly 100, backlight module 10 and display device 1 provided in the embodiment of the present application, the pores 122 in the body diffusion layer 121 in the polarizer 120 are used to diffuse the light, replacing the existing diffusion coating particles. This can avoid scratching the prism layer by the particles, thereby reducing the probability of the optical film 110 being worn. In addition, the optical devices are reduced on the basis of ensuring the optical index requirements of the polarizer 120, which is conducive to thinning the thickness of the backlight module 10.

[0053] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0054] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0055] The optical film assembly, backlight module and display device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An optical film assembly, characterized in that: include: An optical film including a first prism layer; The polarizer comprises a body diffusion layer, wherein the body diffusion layer has pores inside to reflect and refract light, and at least one side surface of the body diffusion layer is a flat surface to be closely connected with the first prism layer.

2. The optical film assembly according to claim 1, characterized in that: The haze of the bulk diffusion layer ranges from 5% to 70%.

3. The optical film assembly according to claim 2, characterized in that: The transmittance of the bulk diffusion layer ranges from 30% to 90%.

4. The optical film assembly according to claim 3, characterized in that: The thickness of the bulk diffusion layer is 0.2 to 0.5 of the thickness of the polarizer.

5. The optical film assembly according to any one of claims 1 to 4, characterized in that: The overall thickness of the polarizer and the optical film is in the range of 250 micrometers to 400 micrometers.

6. The optical film assembly according to claim 5, characterized in that: The polarizer also includes: A polarizing functional layer is arranged on a side of the body diffusion layer away from the optical film; The support layer is arranged on a side of the polarization functional layer away from the body diffusion layer.

7. The optical film assembly according to claim 5, characterized in that: The optical film further comprises: A first substrate layer, disposed on a side of the first prism layer away from the polarizer; A second prism layer is disposed on a side of the first substrate layer away from the first prism layer; The second substrate layer is disposed on a side of the second prism layer away from the first prism layer.

8. A backlight module, characterized in that: The optical film assembly comprises the optical film assembly as described in any one of claims 1 to 7.

9. A display device, characterized in that: Comprising the backlight module as claimed in claim 8.

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