CN108563065B

CN108563065B - Backlight module, manufacturing method and display device

Info

Publication number: CN108563065B
Application number: CN201810198690.4A
Authority: CN
Inventors: 王小龙; 艾江波; 舒伟
Original assignee: Shanghai Tianma Microelectronics Co Ltd; Shanghai AVIC Optoelectronics Co Ltd; Xiamen Tianma Microelectronics Co Ltd
Current assignee: Shanghai Tianma Microelectronics Co Ltd; Shanghai AVIC Optoelectronics Co Ltd; Xiamen Tianma Microelectronics Co Ltd
Priority date: 2018-03-12
Filing date: 2018-03-12
Publication date: 2022-01-07
Anticipated expiration: 2038-03-12
Also published as: CN108563065A

Abstract

The invention discloses a backlight module, a manufacturing method and a display device. The backlight module includes a light guide plate, a backlight source, and a reflective film, wherein the backlight module further includes a curved surface composite film; the curved surface composite film includes a substrate, a diffusion layer and a light enhancement film layer arranged in sequence; the light enhancement film layer is in the shape of a curved surface, and the substrate is The surface of the diffusion layer close to the base is flat, and the surface of the diffusion layer away from the base is curved; the light guide plate is flat; the backlight module is sequentially provided with a reflective film, a light guide plate and a curved composite film. The backlight module disclosed by the invention can solve the problem of film peeling caused by tension when the traditionally designed backlight module is bent; meanwhile, it also overcomes the difficulty of making a curved light guide plate in the traditional backlight module.

Description

Backlight module, manufacturing method and display device

Technical Field

The invention relates to the technical field of display, in particular to a backlight module, a manufacturing method and a display device.

Background

In the conventional display device technology, the display panel is mainly divided into two mainstream technologies, namely a liquid crystal display panel and an organic self-luminous display panel. The liquid crystal display panel forms an electric field capable of controlling the deflection of liquid crystal molecules by applying voltage to two ends of the liquid crystal molecules, and further controls the transmission of light rays to realize the display function of the display panel. In a liquid crystal display device, a backlight module is needed to provide a light source for the display device, and the backlight module is generally divided into an edge type backlight module and a direct type backlight module, wherein the edge type backlight module is a mainstream technology because the thickness of the whole display device can be reduced.

In recent years, people have increasingly demanded higher and higher sensory experiences of display devices, and display devices with curved screens have appeared. The existing backlight module comprises a multi-film-layer structure, and comprises optical films such as a light guide plate, a diffusion sheet, an upper reflection sheet and a lower reflection sheet, when the backlight module is bent, the edge of the bent position is easy to peel off or tilt due to tension in the stacked structure of each film material, and the performance reliability of the display device is affected; the difficulty of the manufacturing process of the curved light guide plate is high, and the manufacturing cost of the liquid crystal display device is increased.

Therefore, it is an urgent need to solve the problem in the art to provide a backlight module with reliable performance, a manufacturing method thereof, and a display device.

Disclosure of Invention

In view of the above, the present invention provides a backlight module, a manufacturing method thereof, and a display device to solve the technical problem encountered when the backlight module is bent in the prior art.

In a first aspect, an embodiment of the present invention provides a backlight module, including a light guide plate, a backlight source, a reflective film, and a curved composite film; the curved surface composite film comprises a substrate, a diffusion layer and a light intensifying film layer which are sequentially arranged; the light intensifying film layer is in a curved surface shape, the substrate is in a plane shape, the surface of the diffusion layer close to the substrate is in a plane shape, and the surface of the diffusion layer far away from the substrate is in a curved surface shape; the light guide plate is planar; the backlight module is sequentially provided with the reflecting film, the light guide plate and the curved surface composite film.

In a second aspect, an embodiment of the present invention provides a method for manufacturing a backlight module, including: sequentially forming a reflecting film light guide plate and a curved surface composite film; forming a backlight source on one side of the backlight module; the method is characterized in that the curved surface composite film is formed by forming a substrate, a diffusion layer and a light intensifying film layer, wherein the substrate is formed in a plane shape, the light intensifying film layer is formed in a curved surface shape, the surface, close to the substrate, of the diffusion layer is formed in a plane shape, and the surface, far away from the substrate, of the diffusion layer is formed in a curved surface shape.

In a third aspect, an embodiment of the present invention provides a display device, where the display device includes any one of the backlight modules provided in the embodiment of the present invention.

Compared with the prior art, the backlight module provided by the invention comprises a light guide plate, a backlight source, a reflecting film and a curved surface composite film. The curved surface composite film comprises a substrate, a diffusion layer and a light-intensifying film layer which are arranged in sequence: the intensifying film layer is in a curved surface shape, the substrate is in a plane shape, the surface of the diffusion layer close to the substrate is in a plane shape, and the surface of the diffusion layer far away from the substrate is in a curved surface shape; the light guide plate is planar; the backlight module is sequentially provided with the reflecting film, the light guide plate and the curved surface composite film. The backlight module provided by the invention achieves the bending effect by arranging the curved surface composite film, and avoids the problems of peeling and the like of the film material during bending; on the other hand, the light guide plate is not required to be bent, the light guide plate still keeps a flat plate shape, and the manufacturing cost is not additionally increased.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an exploded view of a part of a backlight module according to an embodiment of the present invention;

fig. 2 is a schematic top view of a curved composite film of a backlight module according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line AA' of FIG. 2;

fig. 4 is a schematic top view illustrating a backlight module according to an embodiment of the invention;

FIG. 5 is a schematic cross-sectional view taken along line BB' of FIG. 4;

FIG. 6 is a schematic flow chart illustrating a method for manufacturing a backlight module according to an embodiment of the present invention;

FIG. 7 is a schematic flow chart of a method for forming a curved composite film according to an embodiment of the present invention;

FIG. 8 is a schematic flow chart illustrating the formation of a curved composite film in the manufacturing method according to the embodiment of the present invention;

FIG. 9 is a schematic flow chart illustrating a method for manufacturing a backlight module according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a backlight module, as shown in fig. 1, fig. 2 and fig. 3, fig. 1 is a partial structure exploded view of a backlight module provided in an embodiment of the present invention, fig. 2 is a schematic top view of a curved composite film of a backlight module provided in an embodiment of the present invention, fig. 3 is a schematic cross-sectional view along line AA' in fig. 2, a backlight module 100 includes a light guide plate 2, a backlight source 3, a reflective film 4, and a curved composite film 1; the curved surface composite film 1 comprises a substrate 10, a diffusion layer 20 and a light intensifying film layer 40 which are sequentially arranged; the intensifying film layer 40 is curved, the substrate 10 is planar, the surface of the diffusion layer 20 close to the substrate 10 is planar, and the surface of the diffusion layer 20 far away from the substrate 10 is curved; the light guide plate 2 is planar; the backlight module 100 is sequentially provided with a reflective film 4, a light guide plate 2 and a curved surface composite film 1.

The backlight module provided by the embodiment of the invention achieves the effect of bending the backlight module by arranging the curved surface composite film, and the curved surface composite film can avoid the defects and shortcomings generated when the backlight module is bent in the traditional technology by arranging the planar substrate, the diffusion layer with the curved surface and the planar surface and the curved surface intensifying film layer. Meanwhile, the embodiment of the invention does not need to bend the light guide plate of the backlight module, and still keeps the plane shape of the light guide plate, thereby reducing the pressure and the cost of the process manufacturing.

In some alternative embodiments, with continued reference to fig. 3, the curved composite membrane 1 further includes a glue layer 30. The glue layer in the curved surface composite film can ensure that each film material is compact and not easy to separate when being bent, and the phenomenon of peeling or tilting of the film material in the prior art is improved.

In some alternative embodiments, with continued reference to fig. 3, the brightening film layer 40 includes a first brightening film layer 41 and a second brightening film layer 42, and the glue layer 30 includes a first glue layer 31 and a second glue layer 32. The curved-surface composite film 1 includes a substrate 10, a diffusion layer 20, a second glue layer 32, a second brightening film layer 42, a first glue layer 31, and a first brightening film layer 41, which are sequentially disposed. In the above optional embodiment, the first polishing film layer and the second polishing film layer are bonded by the first glue layer, and the second polishing film layer and the diffusion layer are bonded by the second glue layer, so that the bonding tightness of the first polishing film layer, the second polishing film layer and the diffusion layer can be ensured during bending treatment, and the film layer is not easy to peel off and tilt.

In some alternative embodiments, the diffusion layer 20 comprises glue, wherein the type of glue comprises Ultraviolet (UV) glue. In this embodiment, the diffusion layer does not include diffusion particles, and the diffusion mode is particle-free diffusion. It should be noted that the type of glue in the embodiment of the present invention is not limited to UV glue, and those skilled in the art can use the existing technology to replace the UV glue.

In some alternative embodiments, the diffusion layer 20 includes glue and diffusion particles. The glue type includes Ultraviolet (UV) glue, and the diffusion particle material includes acrylic material (PMMA), nylon, and the like. In this embodiment, the diffusion mode of the diffusion layer is particle diffusion. Compared with the particle-free diffusion, the particle diffusion can cause more refraction, reflection and scattering phenomena of light, and achieve better light diffusion effect. It should be noted that the type of glue in the embodiment of the present invention is not limited to UV glue, and the material of the diffusion particles is not limited to PMMA and nylon, and those skilled in the art can use the existing technology to replace them.

In some alternative embodiments, the material of the substrate 10 in the curved composite film 1 is a transparent material, such as a polyethylene terephthalate (PET) material, and the like, and is not limited thereto.

In some alternative embodiments, as shown in fig. 4 and fig. 5, fig. 4 is a schematic top view of a backlight module according to an embodiment of the present invention, fig. 5 is a schematic cross-sectional view taken along line BB' of fig. 4, and the light guide plate 2 is provided with a sawtooth-shaped structure 221 near the surface of the curved composite film 1.

Alternatively, referring to fig. 5, the saw-toothed structure 221 is a V-shaped groove. The structural design can ensure that light rays can obtain a uniform surface light source on the light emergent surface of the light guide plate after being totally reflected for multiple times in the light guide plate, and the uniformity and the directionality of the emergent light are controlled by controlling the distribution density and the geometric configuration of the grooves.

It should be noted that, in the present embodiment, the zigzag structure is only exemplified by the V-shaped groove, but is not limited thereto. Furthermore, the parameters of the sawtooth-shaped structure are not specifically limited in the embodiments of the present invention: taking V-shaped grooves as an example, the above parameters may include the width and depth of the grooves, the arrangement density of the grooves, the arrangement mode (such as longitudinal, transverse or cross), etc., and those skilled in the art can select the parameters according to the prior art and the product requirements.

In some alternative embodiments, please continue to refer to fig. 5, the surface of the light guide plate 2 away from the curved composite film 1 is provided with dots 220. The arrangement of the dots can ensure that the light rays incident into the light guide plate can be emitted to the light emitting surface above the light guide plate without regular total reflection, and the light ray emission quantity of the light emitting surface of the light guide layer can be controlled by controlling the density of the dots. Those skilled in the art can adjust the size and density of the dots according to the product requirements, and the embodiment of the present invention is not limited thereto.

In some optional embodiments, please continue to refer to fig. 5, the backlight module 100 further includes a frame 6, a reflective film tape 7, and a light-shielding tape 5.

Optionally, a rubber frame 6 is disposed at an edge of a main body of the backlight module 100, wherein the main body includes a backlight source 3 (not shown in fig. 5), a light guide plate 2, and a curved composite film 1; the reflective film tape 7 is disposed on the edge of the reflective film 4 near the surface of the frame 6.

Optionally, the light-shielding tape 5 is disposed on an edge of the surface of the curved composite film 1 away from the light guide plate 2.

It should be noted that, in the above optional embodiments, the positions of the rubber frame, the reflective film tape and the light shielding tape in the backlight module are only examples, and the present invention is not limited thereto, for example, the structure of the rubber frame may further include a structural design of the rubber frame and the metal frame, and the like, and those skilled in the art may adjust the positions according to the prior art or the product requirement.

An embodiment of the present invention provides a method for manufacturing a backlight module, as shown in fig. 6, fig. 6 is a schematic flow chart of the method for manufacturing the backlight module, the method includes:

s1: forming a reflective film;

s2: forming a light guide plate;

s3: forming a curved surface composite film;

s4: a backlight source is formed on one side of the backlight module.

Referring to fig. 1, forming the backlight module 100 includes sequentially forming a reflective film 4, a light guide plate 2, and a curved composite film 1. It should be noted that, in the embodiment of the present invention, the order of setting the backlight 3 in step S4 is only an example, and a person skilled in the art may adjust the order according to the prior art and product requirements, and the embodiment of the present invention is not limited; meanwhile, the backlight type in the embodiment of the present invention is not limited to the edge-lit backlight, and this is merely an example.

Alternatively, "S3: the formation of the curved composite film "includes the following steps, as shown in fig. 7, and fig. 7 is a schematic flow chart of the formation of the curved composite film in the manufacturing method according to the embodiment of the present invention:

s31: forming a substrate;

s32: forming a diffusion layer on a substrate;

s33: and forming a light intensifying film layer on the diffusion layer.

Referring to fig. 3, the substrate 10 is formed in a planar shape, the light-enhancing film layer 40 is formed in a curved shape, the surface of the diffusion layer 20 close to the substrate 10 is formed in a planar shape, and the surface of the diffusion layer 20 far from the substrate 10 is formed in a curved shape.

The diffusion layer with the structure that one surface is the plane and the other surface is the curved surface formed on the plane-shaped substrate forms the basis of the bent backlight module, so that the difficult problem that the light guide plate needs to be bent when the bent backlight module is formed in the prior art can be avoided, and the difficulty and the process cost of manufacturing the bent backlight module are reduced.

In some alternative embodiments, please refer to fig. 3, "S3: forming the curved composite film "further includes: a glue layer 30 is formed. The glue layer formed in the curved surface composite film can ensure that each film material is compact and not easy to separate when being bent, and the phenomenon of peeling or tilting of the film material in the prior art is improved.

In some alternative embodiments, please continue to refer to fig. 3, the light-increasing film layer 40 includes a first light-increasing film layer 41 and a second light-increasing film layer 42; the glue layer 30 comprises a first glue layer 31 and a second glue layer 32. As shown in fig. 8, fig. 8 is another schematic flow chart of forming a curved composite film in the manufacturing method according to the embodiment of the present invention, "S3: the method for forming the curved surface composite film comprises the following steps:

s31: forming a substrate;

s32: forming a diffusion layer on a substrate;

s331: forming a second brightening film layer on the diffusion layer, wherein the diffusion layer and the second brightening film layer are adhered through a second glue layer;

s332: and forming a first brightening film layer on the second brightening film layer, wherein the second brightening film layer and the first brightening film layer are attached through a second glue layer.

In the above optional embodiment, the first polishing film layer and the second polishing film layer are bonded by the first glue layer, and the second polishing film layer and the diffusion layer are bonded by the second glue layer, so that the bonding tightness of the first polishing film layer, the second polishing film layer and the diffusion layer can be ensured during bending treatment, and the film layer is not easy to peel off and tilt.

In some alternative embodiments, the "S32: forming a diffusion layer on a substrate "includes: and coating glue on the substrate to enable one side of the glue, which is far away from the substrate, to be in a curved surface shape.

In some alternative embodiments, the "S32: forming a diffusion layer on a substrate "includes: and coating glue on the substrate to enable one side of the glue, which is far away from the substrate, to be in a curved surface shape, wherein the glue is added with diffusion particles. The step of adding the diffusion particles can cause more phenomena of refraction, reflection and scattering of the light, thereby achieving better light diffusion effect.

It should be noted that, in the embodiment of the present invention, the radian of the curved surface can be adjusted by controlling the thickness of the glue on the plane perpendicular to the substrate, for example, the thickness at the center is large, the thickness at the edge is small, or the thickness at the center is small and the thickness at the edge is large, which is not limited in the present invention. The type of glue and/or diffusion particles will not be described in detail here, and reference is made to the preceding description.

In some alternative embodiments, referring to fig. 5, the backlight source 3 (not shown), the light guide plate 2 and the curved composite film 1 form a main body of the backlight module, and the backlight module 100 further includes a reflective film tape 7, a plastic frame 6 and a light blocking tape 5. As shown in fig. 9, fig. 9 is another schematic flow chart of a method for manufacturing a backlight module according to an embodiment of the present invention, where the method for manufacturing a backlight module includes:

s1: forming a reflective film;

s12: arranging a reflecting film adhesive tape on the edge of the reflecting film close to the surface of the adhesive frame;

s13: arranging a rubber frame around the edge of the main body of the backlight module;

s2: forming a light guide plate;

s3: forming a curved surface composite film;

s4: forming a backlight source on one side of the backlight module;

s5: and arranging a shading adhesive tape at the edge of the surface of the curved surface composite film, which is far away from the light guide plate.

The edge of the main body of the backlight module is provided with the rubber frame which can play a role in supporting and protecting the internal components; the reflecting film adhesive tape is used for attaching the reflecting film and the adhesive frame; the edge of the surface of the curved surface composite film, which is far away from the light guide plate, is provided with the shading adhesive tape, so that the fixing and shading effects (the light of the edge light and the light of the lamp position are shaded) are achieved. It should be noted that, in the embodiment of the present invention, the sequence of the steps S12 and S13 is not limited at all, and those skilled in the art can adjust the sequence according to the prior art and the product requirement.

An embodiment of the invention provides a display device, as shown in fig. 10, fig. 10 is a schematic structural diagram of the display device provided in the embodiment of the invention, and the display device 300 includes any one of the backlight modules (not shown in the drawings) provided in the embodiment of the invention and the display panel 200. The display device provided by the invention can avoid the defect that a film material is peeled or tilted when a backlight module in the display device is bent, and improves the use stability of the display device; meanwhile, the light guide plate in the backlight module is not required to be bent, so that the manufacturing cost of the display device is reduced.

The backlight module, the manufacturing method thereof and the display device provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the embodiment of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A backlight module, comprising a light guide plate, a backlight source, a reflective film, is characterized in that,

The backlight module further includes a curved composite film;

The curved composite film includes a substrate, a diffusion layer and a light enhancement film layer arranged in sequence;

The light-enhancing film layer is in the shape of a curved surface, the substrate is in a plane shape, the surface of the diffusion layer close to the substrate is in the shape of a plane, the surface of the diffusion layer away from the substrate is in the shape of a curved surface, and the diffusion layer includes glue and a diffusion layer. particle;

The surface of the light guide plate close to the curved composite film is provided with a zigzag structure, and the surface of the light guide plate away from the curved composite film is provided with dots;

The backlight module is provided with the reflective film, the light guide plate and the curved composite film in sequence;

The curved composite film further includes a glue layer; the light enhancement film layer includes: a first light enhancement film layer and a second light enhancement film layer, and the glue layer includes a first glue layer and a second glue layer;

The curved composite film includes the substrate, the diffusion layer, the second glue layer, the second light enhancement film layer, the first glue layer and the first light enhancement film layer which are arranged in sequence.

2. The backlight module of claim 1, wherein the substrate is a transparent material.

3. The backlight module of claim 1, wherein

Also includes plastic frame and reflective film tape;

The plastic frame is provided on the edge of the main body of the backlight module, wherein the main body includes the backlight source, the light guide plate and the curved composite film;

The reflective film tape is disposed on the edge of the reflective film close to the surface of the plastic frame.

4 . The backlight module of claim 1 , further comprising a light-shielding tape, the light-shielding tape being disposed on an edge of the surface of the curved composite film away from the light guide plate. 5 .

5. A method for manufacturing a backlight module, comprising:

A reflective film, a light guide plate and a curved composite film are formed in sequence, wherein the surface of the light guide plate close to the curved composite film is provided with a zigzag structure, and the surface of the light guide plate away from the curved composite film is provided with dots;

forming a backlight source on one side of the backlight module;

The forming of the curved composite film includes forming a substrate, a diffusion layer, and a light-enhancing film layer, wherein the formed substrate is flat, the formed light-enhancing film layer is a curved surface, and the formed diffusion layer is close to the base. The surface is a plane, and the surface of the formed diffusion layer away from the substrate is a curved surface;

The forming of the curved composite film further includes forming a glue layer; the glue layer includes a first glue layer and a second glue layer; the enhancement film layer includes a first enhancement film layer and a second enhancement film layer;

The forming of the curved composite film sequentially includes:

forming the substrate;

Coating glue on the base, so that the side of the glue away from the base has a curved surface, wherein diffusing particles are added to the glue;

forming the second light enhancement film layer on the diffusion layer, wherein the diffusion layer and the second light enhancement film layer are pasted together through the second glue layer;

The first light enhancement film layer is formed on the second light enhancement film layer, wherein the second light enhancement film and the first light enhancement film layer are pasted together through the second glue layer.

6. The manufacturing method according to claim 5, wherein the backlight source, the light guide plate and the curved composite film form the main body of the backlight module, and the manufacturing method further comprises:

A plastic frame is arranged on the edge of the main body;

A reflective film tape is arranged on the edge of the reflective film close to the surface of the plastic frame.

7. The manufacturing method of claim 5, wherein the manufacturing method further comprises:

A light shielding tape is arranged on the edge of the surface of the curved composite film away from the light guide plate.

8 . A display device, characterized in that , comprising the backlight module according to any one of claims 1 to 4 .