Composite diffusion film and optical module

Abstract

The utility model provides a composite diffusion film and an optical module, the composite diffusion film comprises a first diffusion film and a second diffusion film, and the second diffusion film is laminated on one side of the first diffusion film and is bonded and fixed with the first diffusion film. According to the technical scheme, the composite diffusion film convenient to assemble can be provided.

Description

Technical Field

[0001] The utility model relates to the technical field of diffusion films, in particular to a composite diffusion film and an optical module. Background Art

[0002] In the related art, in an optical module such as a backlight module of a display device, brightness gain can be achieved by setting a diffusion film. In order to meet the requirement of brightness gain, it is usually necessary to stack multiple diffusion films in the optical module. Since multiple diffusion films are usually set separately, multiple diffusion films need to be assembled separately, which has low assembly efficiency, and adjacent diffusion films are prone to positional offset, resulting in poor assembly. Utility Model Content

[0003] The main purpose of the utility model is to provide a composite diffusion film and an optical module, aiming to provide a composite diffusion film that is easy to assemble.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a composite diffusion membrane, comprising:

[0005] a first diffusion film; and

[0006] The second diffusion film is stacked on one side of the first diffusion film and is bonded and fixed to the first diffusion film.

[0007] Optionally, the composite diffusion film further includes an adhesive film layer, and the adhesive film layer is bonded and fixed between the first diffusion film and the second diffusion film by a photocuring process.

[0008] Optionally, the adhesive film layer is made of UV resin.

[0009] Optionally, the thickness of the adhesive film layer ranges from 1 μm to 2 μm.

[0010] Optionally, the first diffusion film comprises:

[0011] a first substrate layer;

[0012] A first diffusion layer, the first diffusion layer is coated on one side surface of the first substrate layer; and

[0013] The second diffusion layer is coated on a surface of the first substrate layer on a side away from the second diffusion layer.

[0014] Optionally, the second diffusion film includes:

[0015] a second substrate layer, used to be bonded to one side surface of the first diffusion membrane through the adhesive film layer; and

[0016] The third diffusion layer is coated on a surface of the second substrate layer facing away from the adhesive film layer.

[0017] Optionally, the thickness of the substrate layer of the first diffusion film and / or the second diffusion film is in the range of 50 μm-75 μm.

[0018] Optionally, at least two types of diffusion particles with different specifications are embedded in the diffusion layer of the first diffusion film and / or the second diffusion film.

[0019] Optionally, the haze range of the composite diffusion membrane is 90% to 95%.

[0020] The utility model further provides an optical module, comprising any one of the aforementioned composite diffusion films, wherein the composite diffusion film comprises:

[0021] a first diffusion film; and

[0022] The second diffusion film is stacked on a side surface of the first diffusion film and is bonded and fixed to the first diffusion film.

[0023] The technical solution of the utility model is to bond and fix the first diffusion film and the second diffusion film to form a composite diffusion film. Compared with a single diffusion film, the composite diffusion film can have a higher brightness gain and can meet the use requirements of the optical module. In addition, the bonding strength between the first diffusion film and the second diffusion film is high, which can make the composite diffusion film have high stiffness, so that the first diffusion film and the second diffusion film are not easy to peel off and cause relative displacement, thereby reducing the risk of poor assembly of the first diffusion film and the second diffusion film; the composite diffusion film can be assembled into the optical module as a whole, and the assembly is more convenient, thereby improving the assembly convenience of the composite diffusion film. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 This is a structural diagram of an embodiment of the composite diffusion membrane of the utility model.

[0026] Description of Figure Numbers:

[0027] Label name Label name 100 Composite diffusion membrane 20 Film layer 10 First diffusion film 30 Second diffuser 11 First substrate layer 31 Second substrate layer 12 First diffusion layer 32 The third diffusion layer 13 Second diffusion layer

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] The utility model provides a composite diffusion membrane 100 .

[0034] Please refer to Figure 1 In some embodiments of the utility model composite diffusion membrane 100, the composite diffusion membrane 100 comprises:

[0035] a first diffusion film 10; and

[0036] The second diffusion film 30 is stacked on one side of the first diffusion film 10 and is bonded and fixed to the first diffusion film 10 .

[0037] The composite diffusion film 100 proposed in the present application can be applied to the light emitting side of the light source of the optical module. The composite diffusion film 100 at least includes a first diffusion film 10 and a second diffusion film 30 which are stacked, and the first diffusion film 10 and the second diffusion film 30 are bonded and fixed to each other. The light emitted by the light source can pass through the first diffusion film 10 and the second diffusion film 30 in sequence, and refract, reflect and scatter in the first diffusion film 10 and the second diffusion film 30 respectively, so that the light can be emitted evenly, and the light can be made more uniform, so as to achieve a certain degree of brightness gain.

[0038] It should be noted that in an optical module such as a backlight module of a display device, the brightness gain of the light source can be achieved by setting a diffusion film. In order to meet the demand for brightness gain, it is usually necessary to stack multiple diffusion films in the optical module. Since multiple diffusion films are usually set separately, multiple diffusion films need to be assembled separately, which has low assembly efficiency, and adjacent diffusion films are prone to positional offset, resulting in poor assembly.

[0039] Therefore, it can be understood that the technical solution of the present application can composite another diffusion film on the basis of the existing single diffusion film by bonding and fixing the first diffusion film 10 and the second diffusion film 30. Compared with the single diffusion film, the composite diffusion film 100 can have a higher brightness gain, so that it can better meet the use requirements of the optical module. In addition, the bonding strength between the first diffusion film 10 and the second diffusion film 30 is high, which can make the composite diffusion film 100 have high stiffness, so that the first diffusion film 10 and the second diffusion film 30 are not easy to peel off and cause relative displacement, thereby reducing the risk of poor assembly of the first diffusion film 10 and the second diffusion film 30; the composite diffusion film 100 can be assembled into the optical module as a whole, and the assembly is more convenient, thereby improving the assembly convenience of the composite diffusion film 100.

[0040] Of course, the technical solution of the present invention is not limited thereto, and in some embodiments, multiple diffusion films can be stacked and fixed in sequence by bonding to form a composite diffusion film 100 having multiple diffusion films, so that a higher brightness gain effect can be achieved. The specific implementation method can be set according to actual needs.

[0041] Please refer to Figure 1 In some embodiments of the composite diffusion film 100 of the utility model, the composite diffusion film 100 further includes an adhesive film layer 20 , and the adhesive film layer 20 is bonded and fixed between the first diffusion film 10 and the second diffusion film 30 by a photocuring process.

[0042] In this embodiment, the adhesive film layer 20 is disposed between the first diffusion film 10 and the second diffusion film 30, and is cured and formed by the corresponding photocurable adhesive, so that the first diffusion film 10 and the second diffusion film 30 are bonded and compounded into a whole through the adhesive film layer 20. The photocurable adhesive can be cured by absorbing external light energy, and has a good shaping before light curing, so that the first diffusion film 10 and the second diffusion film 30 are bonded and compounded by the photocurable adhesive.

[0043] In some embodiments of the composite diffusion film 100 of the utility model, the adhesive film layer 20 is made of UV resin.

[0044] Specifically, UV resin may be coated on one side of one of the first diffusion film 10 and the second diffusion film 30, and then baked at 100° C. for 3 minutes, and then the other of the first diffusion film 10 and the second diffusion film 30 may be stacked on the UV resin, and the first diffusion film 10, the UV resin and the second diffusion film 30 may be rolled and laminated by a composite roller, and finally the UV resin may be UV-cured by an ultraviolet curing lamp to form the adhesive film layer 20. The curing condition of the UV resin may be set to 600 mj / cm2, so that the adhesive film layer 20 may have a better curing effect.

[0045] In some embodiments of the composite diffusion membrane 100 of the utility model, the thickness of the adhesive film layer 20 is in the range of 1 μm to 2 μm.

[0046] In this embodiment, the thickness of the adhesive film layer 20 is between 1 μm and 2 μm, and may be, but not limited to, 1 μm, 1.5 μm, 2 μm, and any value between 1 μm and 2 μm, and is more preferably 2 μm. If the thickness of the adhesive film layer 20 is less than 1 μm, the amount of adhesive in the adhesive film layer 20 is small, and a good bonding effect cannot be achieved, and the connection strength between the first diffusion film 10 and the second diffusion film 30 is low; if the thickness of the adhesive film layer 20 exceeds 2 μm, on the one hand, the production cost of the adhesive film layer 20 will increase, and on the other hand, the occupied volume of the composite diffusion film 100 will increase, and the uniform light performance of the composite diffusion film 100 will be affected.

[0047] Please refer to Figure 1 In some embodiments of the utility model composite diffusion membrane 100, the first diffusion membrane 10 comprises:

[0048] A first substrate layer 11;

[0049] a first diffusion layer 12 , wherein the first diffusion layer 12 is coated on one side surface of the first substrate layer 11 ; and

[0050] The second diffusion layer 13 is coated on a surface of the first substrate layer 11 which is away from the second diffusion layer 13 .

[0051] In this embodiment, the first diffusion film 10 includes a first diffusion layer 12, a first substrate layer 11 and a second diffusion layer 13 which are stacked in sequence. The material of the first substrate layer 11 is PET material. The diffusion layers of the first diffusion film 10 and the second diffusion film 30 both include a resin layer covering the surface of the substrate layer and a plurality of diffusion particles embedded in the resin layer. The first diffusion layer 12 and the second diffusion layer 13 can be prepared by coating on the surface of the first substrate layer 11, but are not limited to, and the preparation process is relatively simple.

[0052] Specifically, the preparation process of the first diffusion layer 12 is described in detail: first, the diffusion particles and the resin material are uniformly mixed to form a coating liquid; then, the coating liquid is uniformly coated on one side of the first substrate layer 11 by means of micro-concave roller coating; then, the coated film material is dried in an oven at a temperature of 50°C to 110°C for 1 minute, wherein the number of ovens can be but is not limited to 6, and the temperature of each oven is set from low temperature to high temperature and then from high temperature to low temperature; finally, the dried film material is aged in an aging room at a temperature of 60°C for 24 hours, and the first diffusion layer 12 can be formed on one side of the first substrate layer 11. Similarly, referring to the preparation process of the first diffusion layer 12, the second diffusion layer 13 can be prepared by the same process flow, which will not be described in detail here.

[0053] In some embodiments, the structure of the second diffusion film 30 can be set with reference to the first diffusion film 10, that is, two diffusion layers are respectively set on the opposite sides of a substrate layer; of course, the technical solution of the utility model is not limited thereto, and the structure of the second diffusion film 30 can also be set as a diffusion layer is set on one side surface of a substrate layer in the following embodiment. The specific implementation method can be set according to actual needs and is not limited here.

[0054] Please refer to Figure 1 In some embodiments of the utility model composite diffusion membrane 100, the second diffusion membrane 30 includes:

[0055] A second substrate layer 31 , used to be bonded to one side surface of the first diffusion film 10 through the adhesive film layer 20 ; and

[0056] The third diffusion layer 32 is coated on a surface of the second substrate layer 31 which is away from the adhesive film layer 20 .

[0057] In this embodiment, the second diffusion film 30 includes a second substrate layer 31 and a third diffusion layer 32 stacked in sequence, the second substrate layer 31 is made of PET material, and the diffusion layers of the third diffusion film include a resin layer covering the surface of the substrate layer and a plurality of diffusion particles embedded in the resin layer. Among them, the third diffusion layer 32 can be prepared by coating but not limited to forming on the surface of the first substrate layer 11, and the preparation process is relatively simple. Similarly, referring to the preparation process of the first diffusion layer 12, the third diffusion layer 32 can be prepared by the same process flow, which will not be repeated here.

[0058] It should be noted that the surface of the third diffusion layer 32 is a rough surface, that is, a number of diffusion particles are protruding from the surface of the third diffusion layer 32. Therefore, the second diffusion film 30 is coated only on one side of the second substrate layer 31 to form the third diffusion layer 32, and the adhesive film layer 20 is formed on the other side of the second substrate layer 31. Compared with the solution of forming the adhesive film layer 20 on the rough surface of the third diffusion layer 32, it is convenient to combine the adhesive film layer 20 and the second diffusion film 30, which is beneficial to improve the processing convenience of the composite diffusion film 100.

[0059] Please refer to Figure 1 In some embodiments of the utility model composite diffusion film 100, the thickness of the substrate layer of the first diffusion film 10 and / or the second diffusion film 30 is in the range of 50 μm-75 μm.

[0060] In this embodiment, the first diffusion film 10 and the second diffusion film 30 can form a diffusion layer by coating on one side surface of a substrate layer. The thickness of the substrate layer of the first diffusion film 10 and the second diffusion film 30 is 50 μm-75 μm, and can be, but not limited to, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, and any value between 50 μm and 75 μm. If the thickness of the substrate layer is less than 50 μm, the thickness of the substrate layer is too thin, which affects the structural strength of the diffusion film; if the thickness of the substrate layer exceeds 75 μm, the thickness of the substrate layer is too thick, which is not convenient for the coating process, and increases the difficulty of producing the composite diffusion film 100.

[0061] Please refer to Figure 1 In some embodiments of the utility model composite diffusion membrane 100, at least two types of diffusion particles with different specifications are embedded in the diffusion layer of the first diffusion membrane 10 and / or the second diffusion membrane 30.

[0062] In this embodiment, the diffusion layers of the first diffusion film 10 and the second diffusion film 30 both include a resin layer covering the surface of the substrate layer and a plurality of diffusion particles embedded in the resin layer. By dispersing the diffusion particles between the resin layers, the light can continuously pass through media with different refractive indices when passing through the diffusion layer, causing the light to undergo many refractions, reflections, and scattering phenomena, thereby achieving an optical diffusion effect and making the light output more uniform. Furthermore, at least two diffusion particles of different specifications are embedded in the diffusion layer, which may refer to, but is not limited to, different particle sizes of the diffusion particles.

[0063] It can be understood that by adopting two types of diffusion particles with different particle size specifications, on the one hand, the light can be better diffused and diffused, thereby improving the light diffusion effect; on the other hand, the diffusion particles with large particle size can form a protruding structure on the surface of the diffusion layer facing away from the substrate layer, and can fully contact the film layer 20 through multiple protruding structures, so that the diffusion layer and the film layer 20 can be well combined. Relatively speaking, the diffusion particles with small particle size can form a concave structure on the surface of the diffusion layer facing away from the substrate layer, so that an air gap layer can be enclosed between the diffusion layer and the film layer 20. In this way, due to the different refractive indices of the air gap layer and the diffusion layer, it is beneficial to further refract, reflect and scatter the light, thereby further achieving the effect of optical diffusion.

[0064] Please refer to Figure 1 In some embodiments of the utility model composite diffusion membrane 100, the haze range of the composite diffusion membrane 100 is 90% to 95%.

[0065] In this embodiment, the haze of each diffusion layer in the composite diffusion film 100 can be tested with reference to the standard of GB / T 25273-2010 "Measurement Method of Thin Film Haze for Liquid Crystal Display (LCD) - Integrating Sphere Method". The haze of the composite diffusion film 100 is in the range of 90% to 95%, that is, the composite diffusion film 100 has a high haze to homogenize the backlight source.

[0066] In some embodiments of the composite diffusion film 100 of the utility model, the brightness L0 of the first diffusion film 10 and the brightness L1 of the superposition of the first diffusion film 10 and the composite diffusion film 100 can be measured by using a specific backlight source, so that the brightness gain of the composite diffusion film 100 can be measured as L1 / L0. In some embodiments, the brightness L0 of the first diffusion film 10 measured experimentally is 158, and the brightness L1 of the superposition of the first diffusion film 10 and the composite diffusion film 100 is 230, so the brightness gain of the composite diffusion film 100 is about 1.46.

[0067] The present invention also provides an optical module, which includes the composite diffusion film 100 described in any of the above embodiments. The specific structure of the composite diffusion film 100 refers to any of the above embodiments. Since the optical module proposed in this application can apply all the technical solutions in all the above embodiments, it at least has all the beneficial effects brought by the above technical solutions, which will not be described one by one here.

[0068] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A composite diffusion membrane, characterized in that: include: a first diffusion film; and The second diffusion film is stacked on one side of the first diffusion film and is bonded and fixed to the first diffusion film.

2. The composite diffusion membrane according to claim 1, characterized in that The composite diffusion film further includes an adhesive film layer, and the adhesive film layer is bonded and fixed between the first diffusion film and the second diffusion film by a photocuring process.

3. The composite diffusion membrane according to claim 2, characterized in that The material of the adhesive film layer is UV resin.

4. The composite diffusion membrane according to claim 2, characterized in that The thickness of the adhesive film layer ranges from 1 μm to 2 μm.

5. The composite diffusion membrane according to claim 2, characterized in that: The first diffusion film comprises: a first substrate layer; A first diffusion layer, the first diffusion layer is coated on one side surface of the first substrate layer; and The second diffusion layer is coated on a surface of the first substrate layer on a side away from the second diffusion layer.

6. The composite diffusion membrane according to claim 2, characterized in that The second diffusion film comprises: a second substrate layer, used to be bonded to one side surface of the first diffusion membrane through the adhesive film layer; and The third diffusion layer is coated on a surface of the second substrate layer facing away from the adhesive film layer.

7. The composite diffusion membrane according to any one of claims 1 to 6, characterized in that: The thickness of the substrate layer of the first diffusion film and / or the second diffusion film is in the range of 50 μm to 75 μm.

8. The composite diffusion membrane according to any one of claims 1 to 6, characterized in that: At least two types of diffusion particles with different specifications are embedded in the diffusion layer of the first diffusion film and / or the second diffusion film.

9. The composite diffusion membrane according to any one of claims 1 to 6, characterized in that: The haze range of the composite diffusion membrane is 90% to 95%.

10. An optical module, characterized in that: The method comprises the composite diffusion membrane as claimed in any one of claims 1 to 9.

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