Backlight film material layer and vehicle-mounted backlight module

Abstract

The utility model discloses a backlight film material layer and a vehicle-mounted backlight module, and relates to the field of vehicle-mounted display devices, the backlight film material layer comprises a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film which are stacked in sequence, the same side edge of the upper brightness enhancement film and the lower brightness enhancement film is provided with a first extension part and a second extension part which are staggered, one end of the diffusion film is provided with a double-sided adhesive, and the other end of the diffusion film is provided with a second extension part. The double-sided adhesive tape comprises a first surface, a second surface and a third surface, the first surface is adhered to the diffusion film, the second surface is adhered to the first extension part, the third surface is adhered to the second extension part, the second surface and the third surface are located on the same side of the double-sided adhesive tape and have a height difference, and the height difference is consistent with the thickness of the lower bright enhancement film; according to the utility model, the diaphragm is prevented from being separated in the driving process, the problem of abnormal sound caused by displacement of the diaphragm is effectively solved, and the product quality of the backlight module is improved; and the single-piece double-sided adhesive is adopted for bonding and fixing, so that the operation is simple, the technological process is saved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted display devices, in particular to a backlight film material layer and a vehicle-mounted backlight module. Background Art

[0002] There is a requirement for anti-noise for vehicle backlights. Vibration and abnormal noise of film materials in vehicle backlights are common problems. The film material layers are fixed by adhesive. For example, China's patent application No. 202022753626.3 discloses a narrow-frame backlight module for improving abnormal noise of the film, which includes an iron frame, a middle frame, a reflective sheet, a light guide plate and an optical film. The middle frame is connected to the iron frame, and a accommodating cavity is formed between the iron frame and the middle frame. The reflective sheet, the light guide plate and the optical film are arranged in the accommodating cavity. The optical film includes a diffusion film, a light-enhancing film and a brightness-enhancing film. The diffusion film is arranged on the light guide plate, the light-enhancing film is arranged on the diffusion film, and the brightness-enhancing film is arranged on the brightness-enhancing film. The brightness-enhancing film and the middle frame are fixed by double-sided tape; a single-sided tape is connected to one side of the brightness-enhancing film away from the double-sided tape, one side of the single-sided tape is adhered to the surface of the brightness-enhancing film, and the other side of the single-sided tape is adhered to the iron frame. A bonding notch is provided on the side of the brightness-enhancing film, and the diffusion film is exposed from the bonding notch. The single-sided tape is fixed to the middle frame by the bonding notch. The opening is pasted on the brightness enhancement film and the diffusion film; in this scheme, the brightness enhancement film is pasted and fixed to the middle frame by double-sided tape, which avoids the problems of shaking and abnormal noise caused by the loose fixation of the brightness enhancement film, and the brightness enhancement film and the brightness enhancement film are bonded and fixed to the iron frame by single-sided tape, but because the brightness enhancement film has a certain thickness, the adhesion between the single-sided tape and the diffusion film is weak, and the car needs to adapt to operation in various environments, the vehicle-mounted vibration is relatively high, and the diaphragms of the film material will separate, and the diaphragms are prone to shifting and producing abnormal noise, resulting in defective products; and the use of single-sided tape and double-sided tape to fix the film material at both ends is not only cumbersome, but also increases the material cost. Therefore, the utility model discloses a backlight film layer and a vehicle-mounted backlight module to solve the above problems. Utility Model Content

[0003] Based on this, it is necessary to provide a backlight film layer and a vehicle-mounted backlight module to address the above-mentioned technical problems. The diffusion film is bonded to the extension part one and the extension part two by double-sided adhesive, thereby improving the bonding strength between the film materials and improving the shock resistance. The separation of the diaphragm during driving is avoided, and the problem of abnormal noise caused by diaphragm displacement is effectively solved, thereby improving the product quality of the backlight module. In addition, a single piece of double-sided adhesive is used for fixing, which is simple to operate, saves process flow, and reduces production costs.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A backlight film layer, which comprises a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film that are stacked in sequence. The same side of the upper brightness enhancement film and the lower brightness enhancement film is provided with a staggered extension part one and extension part two. One end of the diffusion film is provided with a double-sided adhesive. The double-sided adhesive comprises a first surface, a second surface and a third surface. The first surface is bonded to the diffusion film, the second surface is bonded to the extension part one, and the third surface is bonded to the extension part two. The second surface and the third surface are located on the same side of the double-sided adhesive and have a height difference, and the height difference is consistent with the thickness of the lower brightness enhancement film.

[0006] As a preferred embodiment of the backlight film layer provided by the present utility model, the upper brightness enhancement film and the lower brightness enhancement film are of the same size, and the extension part one and the extension part two are symmetrically arranged in a planar state.

[0007] As a preferred embodiment of the backlight film layer provided by the present utility model, the length of the extension part one is half of the corresponding side length of the upper brightness enhancement film, and the length of the extension part two is half of the corresponding side length of the lower brightness enhancement film.

[0008] As a preferred embodiment of the backlight film layer provided by the present utility model, at least one arc-shaped groove is provided on the edges of the extension part one and the extension part two.

[0009] As a preferred embodiment of the backlight film layer provided by the present utility model, U-shaped grooves are provided at the joints of the extension part one and the edge of the upper brightness enhancement film and at the joints of the extension part two and the edge of the lower brightness enhancement film.

[0010] As a preferred embodiment of the backlight film layer provided by the present utility model, the width of the double-sided adhesive is 2 mm, and the widths of the extension part one and the extension part two are the same as the width of the double-sided adhesive.

[0011] As a preferred embodiment of the backlight film layer provided by the present utility model, it further comprises a light guide plate. A shallow groove is provided on one side edge of the light guide plate, and an adhesive layer is provided in the shallow groove. The adhesive layer is bonded to one side edge of the surface of the diffusion film facing away from the lower brightness enhancement film.

[0012] As a preferred embodiment of the backlight film layer provided by the present utility model, the adhesive layer is a black adhesive layer.

[0013] As a preferred embodiment of the backlight film layer provided by the present utility model, a stop block is provided on the light guide plate. The stop block is provided on the remaining side surfaces of the light guide plate except the side close to the double-sided adhesive, and the upper surface of the stop block is flush with the upper surface of the upper brightness enhancement film.

[0014] A vehicle-mounted backlight module, which comprises the above-mentioned backlight film layer.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] For the backlight film layer and the vehicle-mounted backlight module provided by the utility model, the diffusion film is bonded to the first extension part and the second extension part through double-sided adhesion, and a height difference is set between the second surface and the third surface, so as to fill the thickness gap of the lower brightness enhancement film, enabling the double-sided adhesion to fully adhere to the upper brightness enhancement film, thereby bonding the diffusion film, the lower brightness enhancement film and the upper brightness enhancement film into an integral structure, greatly improving the bonding strength between the films, further enhancing the earthquake resistance performance, avoiding the separation of the film sheets during driving, effectively solving the problem of abnormal noise caused by the displacement of the film sheets, and improving the product quality of the backlight module; moreover, a single-piece double-sided adhesion is used for bonding and fixing, with simple operation, saving the process flow and reducing the production cost.

[0017] For the backlight film layer and the vehicle-mounted backlight module provided by the utility model, the arc-shaped grooves and U-shaped grooves provided on the two extension parts can reduce the rebound stress of the film sheets, making the double-sided adhesion more firm.

[0018] For the backlight film layer and the vehicle-mounted backlight module provided by the utility model, shallow grooves are arranged on the side of the light guide plate, and each film sheet is bonded and fixed by an adhesive layer, and the adhesive layer can play a role in light shielding, and a stop block can be used to horizontally limit the film material, preventing the film material from horizontally deviating, avoiding abnormal noise caused by the impact of the film material on the iron frame, and at the same time, the stop block can be abutted against the iron frame, so as to limit the light guide plate and prevent the light guide plate from deviating. Description of the Drawings

[0019] In order to more clearly illustrate the solutions in the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the backlight film layer provided by the present utility model;

[0021] Figure 2 It is an exploded schematic diagram of the overall structure of the backlight film layer provided by the present utility model Figure 1 ;

[0022] Figure 3 It is an exploded schematic diagram of the overall structure of the backlight film layer provided by the present utility model Figure 2 ;

[0023] Figure 4 It is a plan schematic diagram of the overall structure of the backlight film layer provided by the present utility model;

[0024] Figure 5Schematic three-dimensional view of the connection structure between the backlight film layer and the light guide plate provided by the present utility model;

[0025] Figure 6 Exploded view of the connection structure between the backlight film layer and the light guide plate provided by the present utility model.

[0026] The markings in the figure are explained as follows:

[0027] 1. Diffusion film; 2. Lower brightness enhancement film; 3. Upper brightness enhancement film; 4. First extension part; 5. Second extension part; 6. Double-sided adhesive; 61. First surface; 62. Second surface; 63. Third surface; 7. Arc-shaped groove; 8. U-shaped groove; 9. Light guide plate; 10. Shallow groove; 11. Adhesive layer; 12. Stopper. Detailed implementation manners

[0028] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] As described in the background art, since the brightness enhancement film has a certain thickness, the adhesion between the single-sided tape and the diffusion film is weak, and the vehicle has to adapt to running in various environments, with relatively high vehicle vibrations. Separation may occur between the film sheets of the film material, and film sheet displacement is likely to occur, resulting in abnormal noises and causing product defects; moreover, using single-sided tape and double-sided tape to fix the film material with both ends staggered not only makes the process cumbersome but also increases the material cost.

[0030] To solve this technical problem, the present utility model provides a backlight film layer and a vehicle-mounted backlight module, which are applied to the field of vehicle-mounted display devices.

[0031] Specifically, please refer to Figures 1-4 , the backlight film layer specifically includes a diffusion film 1, a lower brightness enhancement film 2, and an upper brightness enhancement film 3 that are sequentially stacked. The same side of the upper brightness enhancement film 3 and the lower brightness enhancement film 2 is provided with a first extension part 4 and a second extension part 5 that are staggered. One end of the diffusion film 1 is provided with a double-sided adhesive 6. The double-sided adhesive 6 includes a first surface 61, a second surface 62, and a third surface 63. The first surface 61 is bonded to the diffusion film 1, the second surface 62 is bonded to the first extension part 4, the third surface 63 is bonded to the second extension part 5. The second surface 62 and the third surface 63 are located on the same side of the double-sided adhesive 6 and have a height difference, and the height difference is the same as the thickness of the lower brightness enhancement film 2.

[0032] The in-vehicle backlight module includes the above-mentioned backlight film layer.

[0033] The backlight film layer and the in-vehicle backlight module provided by the present utility model bond the diffusion film 1 to the first extension part 4 and the second extension part 5 through the double-sided adhesive 6, and a height difference is set between the second surface 62 and the third surface 63, which can fill the thickness gap of the lower brightness enhancement film 2, enabling the double-sided adhesive 6 to fully adhere to the upper brightness enhancement film 3, thereby bonding the diffusion film 1, the lower brightness enhancement film 2, and the upper brightness enhancement film 3 into an integral structure, greatly improving the bonding strength between the film materials, further enhancing the seismic performance, avoiding the separation of the film sheets during driving, effectively solving the problem of abnormal noise caused by the displacement of the film sheets, and improving the product quality of the backlight module; moreover, a single-piece double-sided adhesive 6 is used for bonding and fixing, which is simple to operate, saves the process flow, and reduces the production cost.

[0034] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

[0035] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0036] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] Please refer to Figures 1-4 , which provides a backlight film layer, which includes a diffusion film 1, a lower brightness enhancement film 2, and an upper brightness enhancement film 3 stacked in sequence. The first extension part 4 and the second extension part 5 are provided on the same side of the upper brightness enhancement film 3 and the lower brightness enhancement film 2 with a stagger. The first extension part 4 and the extension part are both provided at one end of the backlight module where the backlight source is provided. One end of the diffusion film 1 is provided with a double-sided adhesive 6. The double-sided adhesive 6 includes a first surface 61, a second surface 62, and a third surface 63. Among them, the first surface 61 is bonded to the diffusion film 1, the second surface 62 is bonded to the first extension part 4, and the third surface 63 is bonded to the second extension part 5. The first surface 61 is in an overall planar shape. The second surface 62 and the third surface 63 are located on the same side of the double-sided adhesive 6, forming a stepped structure. The second surface 62 and the third surface 63 have a height difference, and the height difference is the same as the thickness of the lower brightness enhancement film 2. In this example, the thickness of the double-sided adhesive 6 at the second surface 62 is 0.2 mm, and the thickness of the double-sided adhesive 6 at the third surface 63 is 0.1 mm.

[0038] An extension part 4 is provided on the left side of one end of the upper brightness enhancement film 3, and an extension part 5 is provided on the right side of one end of the lower brightness enhancement film 2. The upper brightness enhancement film 3 and the lower brightness enhancement film 2 are of the same size, and the extension part 4 and the extension part 5 are symmetrically arranged in a planar state. At the same time, the length of the extension part 4 is half of the corresponding side length of the upper brightness enhancement film 3, and the length of the extension part 5 is half of the corresponding side length of the lower brightness enhancement film 2. The planar size formed after the upper brightness enhancement film 3 and the lower brightness enhancement film 2 are laminated is the same as the planar size of the diffusion film 1, and the sides of the extension part 4 and the extension part 5 that are close to each other are butted and adhered.

[0039] The width of the double-sided adhesive 6 is 2 mm, and the widths of the extension part 4 and the extension part 5 are the same as the width of the double-sided adhesive 6. And the double-sided adhesive 6 is a strong adhesive double-sided adhesive 6, which increases the bonding area and enhances the bonding strength.

[0040] Applying this backlight film material layer to the in-vehicle backlight module can avoid the separation of the film pieces during driving, effectively solve the problem of abnormal noise caused by the displacement of the film pieces, and improve the product quality of the backlight module.

[0041] Further optimize the backlight film material layer and the in-vehicle backlight module provided in Embodiment 1. Specifically, as Figure 2 、 4 shown, two arc-shaped grooves 7 are provided on the edges of both the extension part 4 and the extension part 5. U-shaped grooves 8 are provided at the joints between the edge of the extension part 4 and the upper brightness enhancement film 3 and at the joints between the edge of the extension part 5 and the lower brightness enhancement film 2. The provided arc-shaped grooves 7 and U-shaped grooves 8 can reduce the rebound stress of the film pieces, making the double-sided adhesive 6 bond more firmly. The arc-shaped grooves 7 and U-shaped grooves 8 are both punched by a die-cutting machine.

[0042] Further optimize the backlight film material layer and the in-vehicle backlight module provided in Embodiment 2. Specifically, as Figure 5 、 6 shown, the diffusion film 1 is bonded to the light guide plate 9. Specifically, a shallow groove 10 is provided on the side surface of one surface of the light guide plate 9 close to the diffusion film 1. The shallow groove 10 is provided in the non-visible area of the backlight module. An adhesive layer 11 is provided in the shallow groove 10. The adhesive layer 11 is bonded to the side of the surface of the diffusion film 1 facing away from the lower brightness enhancement film 2, so as to bond and fix the film material layer on the light guide plate 9. And the adhesive layer 11 is a black adhesive layer 11, which can play a light-shielding effect.

[0043] The shallow groove 10 can adopt a continuous wire groove structure and is arranged around the periphery of the light guide plate 9. The setting of the shallow groove 10 can increase the thickness of the adhesive layer 11 and thus enhance the bonding strength. The adhesive layer 11 can be black glue, formed by dispensing, or can be a black double-sided tape.

[0044] The light guide plate 9 is provided with stoppers 12. The stoppers 12 are arranged on the remaining sides of the light guide plate 9 except for the side close to the double-sided adhesive 6, and the upper surface of the stopper 12 is flush with the upper surface of the upper brightness enhancement film 3. There are three stoppers 12, which are respectively located on the three sides of the light guide plate 9 without a backlight source. The stoppers 12 are used to limit and block the film, preventing the film material from being horizontally displaced, avoiding abnormal noise caused by the impact between the film material and the iron frame. At the same time, after being installed in the iron frame, the stopper 12 abuts against the iron frame, thereby achieving the limit of the light guide plate 9 and preventing the light guide plate 9 from being displaced.

[0045] The stopper 12 can be an integral structure with the light guide plate 9, or can be fixedly pasted separately. Of course, an adhesive layer can also be provided on the outer side surface of the stopper 12 for bonding and fixing to the light guide plate 9.

[0046] In some embodiments, the stopper 12 can also be arranged on the upper surface of the shallow groove 10, and at the same time, slots are opened at the corresponding positions on each film, which can also achieve the purpose of limiting the film.

[0047] The working principle of the backlight film material layer and the vehicle-mounted backlight module provided by the present utility model: Bond and fix the first surface 61 of the double-sided adhesive 6 to one end of the diffusion film 1, then bond the second extension 5 of the lower brightness enhancement film 2 to the third surface 63 on the double-sided adhesive 6, and bond the first extension 4 on the upper brightness enhancement film 3 to the second surface 62 on the double-sided adhesive 6, thereby bonding and fixing the various films on the film material layer together. And a height difference is provided between the second surface 62 and the third surface 63, which can fill the thickness gap of the lower brightness enhancement film 2, enabling the double-sided adhesive 6 to be fully pasted to the upper brightness enhancement film 3, thereby bonding the diffusion film 1, the lower brightness enhancement film 2 and the upper brightness enhancement film 3 into an integral structure, greatly improving the bonding strength between the film materials, further improving the seismic performance, avoiding the separation of the films during driving, effectively solving the problem of abnormal noise caused by film displacement, and improving the product quality of the backlight module; and using a single-piece double-sided adhesive 6 for bonding and fixing, the operation is simple, the process flow is saved, and the production cost is reduced.

[0048] In the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all of them. The preferred embodiments of the present utility model are shown in the accompanying drawings, but they do not limit the patent scope of the present utility model. The present utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structures made by using the content of the specification and drawings of the present utility model, directly or indirectly applied in other related technical fields, are equally within the scope of the patent protection of the present utility model.

Claims

1. A backlight film layer, which comprises a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film that are sequentially stacked, and is characterized in that, The same side of the upper brightness enhancement film and the lower brightness enhancement film is provided with a staggered extension part one and extension part two. One end of the diffusion film is provided with a double-sided adhesive. The double-sided adhesive includes a first surface, a second surface, and a third surface. The first surface is bonded to the diffusion film, the second surface is bonded to the extension part one, and the third surface is bonded to the extension part two. The second surface and the third surface are located on the same side of the double-sided adhesive and have a height difference, and the height difference is the same as the thickness of the lower brightness enhancement film.

2. The backlight film layer according to claim 1, characterized in that, The upper brightness enhancement film and the lower brightness enhancement film are of the same size, and the extension part one and the extension part two are symmetrically arranged in a planar state.

3. A backlight film layer according to claim 2, characterized in that, The length of the extension part one is half of the corresponding side length of the upper brightness enhancement film, and the length of the extension part two is half of the corresponding side length of the lower brightness enhancement film.

4. A backlight film layer according to claim 1, wherein, At least one arc-shaped groove is provided at the edges of the extension part one and the extension part two.

5. A backlight film layer according to claim 1, wherein, U-shaped grooves are provided at the joints between the extension part one and the edge of the upper brightness enhancement film and between the extension part two and the edge of the lower brightness enhancement film.

6. A backlight film layer according to claim 1, characterized in that, The width of the double-sided adhesive is 2 mm, and the widths of the extension part one and the extension part two are the same as the width of the double-sided adhesive.

7. A backlight film layer according to claim 1, characterized in that, It further includes a light guide plate. A shallow groove is provided on the side of one surface of the light guide plate, and an adhesive layer is provided in the shallow groove. The adhesive layer is bonded to the side of the surface of the diffusion film facing away from the lower brightness enhancement film.

8. A backlight film layer according to claim 7, characterized in that, The adhesive layer is a black adhesive layer.

9. The backlight film layer according to claim 7, wherein, A stop block is provided on the light guide plate. The stop block is provided on the remaining sides of the light guide plate except the side close to the double-sided adhesive, and the upper surface of the stop block is flush with the upper surface of the upper brightness enhancement film.

10. A vehicle-mounted backlight module, characterized in that, It includes a backlight film material layer according to any one of claims 1-9.

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