A dual-sided light backlight module

Abstract

The utility model discloses a kind of double-sided light type backlight module, comprising: backplate;Two groups of LED light bar are oppositely arranged in two inner side walls of backplate;Reflective sheet, light guide plate and optical film piece are sequentially placed in backplate and between two groups of LED light bar;Reflective sheet, light guide plate and optical film piece are centrally arranged between two groups of LED light bar.The utility model can make the light emitted by two groups of LED light bar evenly reflect via reflective sheet, then emit via light guide plate and optical film piece, so as to realize the uniform light emission of backlight module, to ensure the display quality of liquid crystal display.

Description

Technical Field

[0001] This utility model belongs to the field of liquid crystal display technology, specifically relating to a dual-side light backlight module. Background Technology

[0002] With the rapid development of the international IT industry, the related LCD display industry is constantly innovating, and LCD display products are becoming more diversified and portable. The application fields of LCD displays, especially color LCD displays, are also constantly expanding. Driven by the LCD display market, the backlight module industry is booming. LCD displays are non-light-emitting display devices, and the backlight module, as one of the key components of LCD displays, functions to provide sufficient brightness and uniformly distributed light source so that the LCD display can display images normally.

[0003] From the perspectives of energy saving, environmental protection, and ultra-low cost, edge-lit backlight modules are gradually shifting from four-sided light source to single-sided or dual-sided light source. For dual-sided light source backlight modules, there is a problem of uneven reflection at the two edges, resulting in uneven light output from the backlight module, which in turn leads to poor image quality of the LCD monitor and fails to meet user requirements. Utility Model Content

[0004] The purpose of this utility model is to disclose a dual-sided light backlight module with uniform light output.

[0005] To achieve the above objectives, this utility model discloses a dual-sided backlight module, comprising:

[0006] Back panel;

[0007] Two sets of LED light strips are positioned opposite each other on the two inner side walls of the back panel;

[0008] The reflector, light guide plate, and optical film are sequentially placed on the back panel between the two sets of LED light strips;

[0009] The reflector, light guide plate, and optical film are all centrally located between the two sets of LED light strips.

[0010] As an optional implementation, the back panel includes a bottom plate, two first side plates and two second side plates. The two first side plates are arranged opposite each other and extend along a first direction, and the two second side plates are arranged opposite each other and extend along a second direction. The two first side plates and the two second side plates are alternately arranged around the peripheral edge of the bottom plate and located on the same side of the bottom plate.

[0011] Two sets of LED light strips are respectively installed on the inner walls of the two first side plates, and the reflector, light guide plate and optical film are placed in sequence on the base plate.

[0012] As an alternative implementation, in the second direction, the distance between the end of the reflector and the corresponding LED strip is 0.3-0.7 mm larger than the distance between the end of the light guide plate and the corresponding LED strip.

[0013] As an optional implementation, the reflector includes a bottom reflector and side reflectors. The bottom reflector is placed on a base plate, and the side reflectors are located at both ends of the bottom reflector in a first direction and fixed to the inner wall of the second side plate.

[0014] As an optional implementation, the LED light strip includes a substrate and a plurality of LED beads. The substrate is disposed on the inner wall of the corresponding first side plate, and the plurality of LED beads are spaced apart along a first direction on the side of the substrate opposite to its corresponding first side plate. In a third direction, the LED beads are disposed at the lower part of the light guide plate.

[0015] As an optional implementation, the base plate includes a base plate body and a receiving groove. A reflector, a light guide plate, and an optical film are sequentially placed on the base plate body. The receiving groove is located on both sides of the base plate body in a second direction and is arranged corresponding to the LED light strip. In a third direction, the receiving groove is recessed relative to the base plate body. The LED light strip is arranged in the receiving groove so that the LED beads are arranged corresponding to the lower part of the light guide plate.

[0016] As an optional implementation, the reflector, light guide plate, and optical film are all spaced apart from the LED light strip. In the second direction, the side of the receiving groove closest to the base plate body is located below the corresponding end of the reflector.

[0017] As an optional implementation, the bottom plate body is provided with a plurality of heat dissipation grooves at the end corresponding to the receiving groove, and the plurality of heat dissipation grooves are spaced apart along the first direction.

[0018] As an optional implementation, the light guide plate and the optical film are respectively formed with a first limiting part and a second limiting part on the side wall facing the back plate. The side wall of the back plate is provided with a matching limiting groove corresponding to the first limiting part and the second limiting part. The first limiting part and the second limiting part are fixed in the corresponding limiting groove, and a buffer pad is provided between the first limiting part and the corresponding limiting groove.

[0019] As an optional implementation, any contact between the backplate, LED strip, reflector, light guide plate, and optical film is bonded and fixed, and foam is bonded and fixed to the top periphery of the optical film in a third direction.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention places a reflective sheet, a light guide plate, and an optical film centrally between two sets of LED strips. This allows the light emitted from the two sets of LED strips to be uniformly reflected by the reflective sheet and then emitted through the light guide plate and optical film, thereby achieving uniform light output from the backlight module and ensuring the display quality of the LCD. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural schematic diagram of the dual-sided backlight module of this utility model;

[0024] Figure 2 This is an exploded view of the dual-sided backlight module of this utility model;

[0025] Figure 3 This is a cross-sectional view of the dual-sided backlight module of this utility model in the second direction;

[0026] Figure 4 This is a schematic diagram of the structure of the light guide plate, optical film and back plate of this utility model;

[0027] Figure 5 This is a structural schematic diagram of the light guide plate, buffer pad, and back plate of this utility model;

[0028] Figure 6 This is an assembly diagram of the substrate lead-out portion and the back plate of this utility model.

[0029] Explanation of key figure labels:

[0030] 1. Backplate; 11. Baseplate; 111. Baseplate body; 112. Receiving groove; 113. Heat dissipation groove; 114. Through hole; 115. Snap-fit ​​protrusion; 12. First sideplate; 13. Second sideplate; 14. Limiting groove; 2. LED light strip; 21. Substrate; 211. Substrate body; 212. Lead-out part; 213. Snap-fit ​​groove; 22. LED light bead; 3. Reflector; 31. Bottom reflector; 32. Side reflector; 321. Clearance part; 4. Light guide plate; 41. First limiting part; 5. Optical film; 51. Second limiting part; 52. Diffuser film; 53. Brightness enhancement film; 54. Brightness enhancement film; 6. Buffer pad; 7. Double-sided adhesive; 8. Foam; 9. Light shielding layer. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0035] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0036] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0037] Please see Figure 2 and Figure 3As shown, this application provides a dual-sided backlight module, including: a back plate 1; two sets of LED light strips 2 disposed opposite to each other on the two inner sidewalls of the back plate 1; a reflective sheet 3, a light guide plate 4, and an optical film 5 disposed sequentially on the back plate 1 and located between the two sets of LED light strips 2; the reflective sheet 3, the light guide plate 4, and the optical film 5 are all centrally disposed between the two sets of LED light strips 2.

[0038] The uniformity of light output from a backlight module is generally evaluated using a surface scan method. Uneven light output directly affects the image quality of a liquid crystal display (LCD). In this embodiment, by centrally positioning the reflective sheet 3, light guide plate 4, and optical film 5 between the two sets of LED strips 2, the light emitted from the two sets of LED strips 2 is uniformly reflected by the reflective sheet 3 and then uniformly emitted through the light guide plate 4 and optical film 5, thereby achieving uniform light output from the backlight module and ensuring the image quality of the LCD.

[0039] The backplate 1 is generally made by die casting. Depending on the shape and specifications of the liquid crystal display, the shape and specifications of the backplate 1 also vary. It can be large or small, or it can be square or oval, etc. In this application embodiment, a square backplate 1 is used as an example for illustration.

[0040] The back plate 1 includes a base plate 11, two first side plates 12 and two second side plates 13. The two first side plates 12 are arranged opposite each other and extend along a first direction, and the two second side plates 13 are arranged opposite each other and extend along a second direction. The two first side plates 12 and the two second side plates 13 are alternately arranged around the periphery of the base plate 11 and located on the same side of the base plate 11. Two sets of LED light strips 2 are respectively arranged on the inner walls of the two first side plates 12. The reflector 3, the light guide plate 4 and the optical film 5 are arranged in sequence on the base plate 11.

[0041] The first direction is... Figure 1 The X-direction shown is the second direction. Figure 1 The Y-direction shown is the third direction. Figure 1 As shown in the Z direction, the base plate 11 has a square structure. Two first side plates 12 and two second side plates 13 are alternately arranged around the periphery of the base plate 11 and extend upward along the third direction to form an upward-opening cavity structure in the back plate 1. This facilitates the sequentially laid and stacked reflector 3, light guide plate 4 and optical film 5 on the base plate 11. Two sets of LED light strips 2 are respectively set on the inner walls of the two first side plates 12 to realize the assembly of the backlight module.

[0042] Furthermore, see Figure 1 and Figure 2The back plate 1, LED light strip 2, reflector 3, light guide plate 4, and optical film 5 are all bonded and fixed to each other in any contact, and foam 8 is bonded and fixed to the top periphery of the optical film 5 in a third direction. The LED light strip 2 is fixed to the inner wall of the first side plate 12 by double-sided adhesive 7, the reflector 3 is fixed to the bottom plate 11 by double-sided adhesive 7, the light guide plate 4 is fixed to the reflector 3 by double-sided adhesive 7, and the optical film 5 is fixed to the light guide plate 4 by double-sided adhesive 7. Furthermore, the optical film 5 includes a diffusion film 52, a brightness enhancement film 53, and a brightness enhancement film 54 sequentially stacked on the light guide plate 4 in a third direction. The diffusion film 52 is fixed to the light guide plate 4 with double-sided adhesive 7, the brightness enhancement film 53 is fixed to the diffusion film 52 with double-sided adhesive 7, and the brightness enhancement film 54 is fixed to the brightness enhancement film 53 with double-sided adhesive 7. Thus, the backplate 1, LED strips 2, reflector 3, light guide plate 4, and optical film 5 can be stably assembled, ensuring that the distances between the two sets of LED strips 2 and the corresponding reflector 3, light guide plate 4, and optical film 5 at both ends are equal. This guarantees that the light emitted by the LED strips 2 can be uniformly reflected and emitted, thereby improving the light output uniformity of the backlight module. Simultaneously, foam 8 is fixed to the peripheral edge of the brightness enhancement film 54 with double-sided adhesive 7. The foam 8 is used to mount the liquid crystal display, facilitating the assembly of the backlight module and the liquid crystal display.

[0043] Furthermore, to further improve the stability of the backlight module installation, please refer to... Figure 2 , Figure 4 and Figure 5 The light guide plate 4 and the optical film 5 are respectively formed with a first limiting part 41 and a second limiting part 51 facing the side wall of the back plate 1. The side wall of the back plate 1 is provided with a matching limiting groove 14 corresponding to the first limiting part 41 and the second limiting part 51. The first limiting part 41 and the second limiting part 51 are fixed in the corresponding limiting groove 14, and a buffer pad 6 is provided between the first limiting part 41 and the corresponding limiting groove 14.

[0044] For the light guide plate 4, since its two sides in the second direction are LED light strips 2, in order to avoid the LED light strips 2, at least one end of the light guide plate 4 in the first direction facing the second side plate 13 of the back plate 1 is formed with a first limiting part 41. Preferably, both ends are formed with the first limiting part 41 to ensure the installation stability of the light guide plate 4. The number of first limiting parts 41 can be one, two or more. The second side plate 13 is provided with a matching limiting groove 14 corresponding to the first limiting part 41, so as to realize the fixed connection between the light guide plate 4 and the back plate 1 by the fixed connection between the first limiting part 41 and the limiting groove 14. In addition, in order to prevent damage to the light guide plate 4 due to movement, a buffer pad 6 can be provided in the limiting groove 14. The light guide plate 4 is buffered and fixed by fixing the first limiting part 41 to the buffer pad 6.

[0045] For the optical film 5, whether it is the diffusion film 52, the brightness enhancement film 53, or the brightness enhancement film 54, a second limiting part 51 is provided. The second limiting part 51 can be provided corresponding to the first limiting part 41 so that the light guide plate 4 and the optical film 5 are limited by the same limiting groove 14. The second limiting part 51 can also be formed towards the first side plate 12, but care should be taken to avoid the LED light strip 2. At the same time, the first side plate 12 is provided with a limiting groove 14 adapted to the second limiting part 51 so that the optical film 5 and the back plate 1 are fixedly connected by the fixed connection between the second limiting part 51 and the limiting groove 14.

[0046] Based on this, the embodiments of this application achieve the fixed installation of the backlight module through bonding and limiting fixation, so that the reflective sheet 3, light guide plate 4 and optical film 5 can be stably centered between the two sets of LED light strips 2, thereby ensuring the uniformity of light output of the backlight module.

[0047] In addition, in one or more embodiments, in the second direction, the distance between the end of the reflector 3 and the corresponding LED strip 2 is 0.3-0.7 mm larger than the distance between the end of the light guide plate 4 and the corresponding LED strip 2. That is, in the second direction, with both ends of the light guide plate 4 and the reflector 3 spaced apart from the two sets of LED strips 2, the end of the reflector 3 is positioned further away from the LED strip 2 relative to the light guide plate 4. Thus, the reflector 3 is slightly smaller and centrally mounted, resulting in less side reflection of the LED strip 2 and preventing excessive brightness on the sides, thereby ensuring the uniformity of light output from the entire backlight module.

[0048] Furthermore, see Figure 2 The reflective sheet 3 includes a bottom reflective sheet 31 and side reflective sheets 32. The bottom reflective sheet 31 is placed on the base plate 11, and the side reflective sheets 32 are located at both ends of the bottom reflective sheet 31 in the first direction and fixed to the inner wall of the second side plate 13. The bottom reflective sheet 31 is fixed to the base plate 11 with double-sided adhesive 7. The light guide plate 4 is fixed to the bottom reflective sheet 31 with double-sided adhesive 7, and the side reflective sheets 32 are located on both sides of the light guide plate 4 in the first direction and fixed to the second side plate 13 with double-sided adhesive 7. In this way, light can be reflected from the bottom and both sides in the first direction of the light guide plate 4 to avoid light leakage and ensure uniform light output.

[0049] It is worth noting that, since the light guide plate 4 is provided with a first limiting part 41, the side reflector 32 is provided with a clearance part 321 corresponding to the first limiting part 41, so as to realize the fixed installation of the light guide plate 4.

[0050] The LED light strip 2 includes a substrate 21 and a plurality of LED beads 22. The substrate 21 is disposed on the inner wall of the corresponding first side plate 12. The plurality of LED beads 22 are spaced apart along a first direction on the side of the substrate 21 opposite to its corresponding first side plate 12. In a third direction, the LED beads 22 are disposed at the lower part of the light guide plate 4. The LED beads 22 are disposed below the middle of the end of the light guide plate 4, which can prevent the light emitted by the LED beads 22 from leaking out from the top of the light guide plate 4 and ensure that the light emitted by the LED beads 22 can be reflected by the bottom reflector 31 to achieve uniform light output.

[0051] The substrate 21 is fixed to the inner wall of the first side plate 12 by double-sided adhesive tape 7, and the LED beads 22 are electrically connected and mounted on the substrate 21. The substrate 21 extends through the back plate 1 for power connection. See details... Figure 2 , Figure 5 and Figure 6 The substrate 21 includes a substrate body 211 and an extension portion 212. The substrate body 211 is fixed to the inner wall of the first side plate 12 by double-sided adhesive 7. The extension portion 212 is located at the bottom end of the substrate body 211 in a third direction and extends out of the base plate 11. The base plate 11 has a through hole 114 for the extension portion 212 to pass through. On the side of the base plate 11 opposite to the reflector 3, a protrusion 115 is provided corresponding to the extension portion 212. The extension portion 212 has a slot 213 adapted to the protrusion 115. After the extension portion 212 passes through the through hole 114 and is fixed to the bottom of the base plate 11 by the slot 213 and the protrusion 115, the extension portion 212 is fixed to the bottom of the base plate 11. Furthermore, a light-shielding layer 9 is attached to the side of the lead-out portion 212 that passes through the base plate 11 away from the base plate 11 by double-sided adhesive tape 7. The light-shielding layer 9 is fixed at the through hole 114 to prevent light leakage from the base plate 11.

[0052] In one or more embodiments, see Figure 3 The base plate 11 includes a base plate body 111 and a receiving groove 112. The reflector 3, the light guide plate 4 and the optical film 5 are sequentially placed on the base plate body 111. The receiving groove 112 is located on both sides of the base plate body 111 in the second direction and is arranged corresponding to the LED light strip 2. In the third direction, the receiving groove 112 is recessed relative to the base plate body 111. The LED light strip 2 is arranged in the receiving groove 112 so that the LED light beads 22 are arranged corresponding to the lower part of the light guide plate 4.

[0053] The receiving groove 112 and the base plate body 111 are an integral structure. The receiving groove 112 can be formed by opening a groove in the base plate 11, or it can be formed by being recessed relative to the base plate body 111, as long as it can ensure that when the LED light strip 2 is installed in the receiving groove 112, the LED light beads 22 are positioned at the lower part of the light guide plate 4. During assembly, the bottom end of the substrate body 211 abuts against the bottom of the receiving groove 112, so that the receiving groove 112 can be used to move the substrate body 211 downward, thereby moving the LED light beads 22 downward, so as to avoid light leakage from the upper part of the light guide plate 4.

[0054] Furthermore, the reflector 3, light guide plate 4, and optical film 5 are all spaced apart from the LED strip 2. In the second direction, the side of the receiving groove 112 closest to the base plate body 111 is located below the corresponding end of the reflector 3. The receiving groove 112 is widened in the second direction, which facilitates the installation of the LED strip 2 and also facilitates heat dissipation of the LED strip 2.

[0055] Combination Figure 2 and Figure 5 The base plate body 111 has multiple heat dissipation grooves 113 at its end corresponding to the receiving groove 112, and the multiple heat dissipation grooves 113 are spaced apart along a first direction. The heat dissipation grooves 113 can be configured as strip grooves, extending along a second direction, and multiple strip grooves are spaced apart along the first direction. The strip grooves can be used to assist in heat dissipation to prevent the backlight module temperature from rising and affecting performance. In addition, the strip grooves can assist in mold venting and shrinkage prevention during the die casting process of the back plate 1 to ensure the good manufacturing of the back plate 1.

[0056] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A dual-sided backlight module, characterized in that, include: Back panel; Two sets of LED light strips are respectively disposed on the two inner sidewalls of the back plate; A reflective sheet, a light guide plate, and an optical film are sequentially placed on the back plate and located between the two sets of LED strips; The reflective sheet, the light guide plate, and the optical film are all centrally located between the two sets of LED light strips.

2. The dual-sided backlight module according to claim 1, characterized in that: The back panel includes a bottom plate, two first side plates and two second side plates. The two first side plates are arranged opposite each other and extend along a first direction. The two second side plates are arranged opposite each other and extend along a second direction. The two first side plates and the two second side plates are alternately arranged around the peripheral edge of the bottom plate and located on the same side of the bottom plate. The two sets of LED light strips are respectively disposed on the inner walls of the two first side plates, and the reflective sheet, the light guide plate and the optical film are placed in sequence on the base plate.

3. The dual-sided backlight module according to claim 2, characterized in that: In the second direction, the distance between the end of the reflector and the corresponding LED strip is 0.3-0.7 mm greater than the distance between the end of the light guide plate and the corresponding LED strip.

4. The dual-sided backlight module according to claim 2, characterized in that: The reflective sheet includes a bottom reflective sheet and side reflective sheets. The bottom reflective sheet is placed on the base plate, and the side reflective sheets are located at both ends of the bottom reflective sheet in a first direction and fixed to the inner wall of the second side plate.

5. The dual-sided backlight module according to claim 2, characterized in that: The LED light strip includes a substrate and a plurality of LED beads. The substrate is disposed on the inner wall of the corresponding first side plate. The plurality of LED beads are spaced apart along a first direction on the side of the substrate opposite to its corresponding first side plate. In a third direction, the LED beads are disposed at the lower part of the light guide plate.

6. The dual-sided backlight module according to claim 5, characterized in that: The base plate includes a base plate body and a receiving groove. The reflective sheet, the light guide plate and the optical film are sequentially placed on the base plate body. The receiving groove is located on both sides of the base plate body in a second direction and is arranged corresponding to the LED light strip. In a third direction, the receiving groove is recessed relative to the base plate body. The LED light strip is arranged in the receiving groove so that the LED beads are arranged corresponding to the lower part of the light guide plate.

7. The dual-sided backlight module according to claim 6, characterized in that: The reflector, the light guide plate, and the optical film are all spaced apart from the LED light strip. In the second direction, the side of the receiving groove closest to the base plate body is located below the corresponding end of the reflector.

8. The dual-sided backlight module according to claim 6, characterized in that: The base plate body is provided with a plurality of heat dissipation grooves at the end corresponding to the receiving groove, and the plurality of heat dissipation grooves are spaced apart along the first direction.

9. The dual-sided backlight module according to any one of claims 1-7, characterized in that: The light guide plate and the optical film are respectively formed with a first limiting part and a second limiting part on the side wall facing the back plate. The side wall of the back plate is provided with a matching limiting groove corresponding to the first limiting part and the second limiting part. The first limiting part and the second limiting part are fixed in the corresponding limiting groove, and a buffer pad is provided between the first limiting part and the corresponding limiting groove.

10. The dual-sided backlight module according to any one of claims 1-7, characterized in that: The back plate, the LED light strip, the reflector, the light guide plate, and the optical film are all bonded and fixed together in any contact, and foam is bonded and fixed to the top periphery of the optical film in a third direction.

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