Backlight module and display device

Abstract

The utility model discloses a kind of backlight module and display device, belong to display technical field.The backlight module includes backplate, light guide plate, lamp strip component, optical film and light shield piece, backplate includes bottom plate and the side plate around bottom plate, and bottom plate and side plate are formed around and accommodate space;Light guide plate is located in accommodating space and is set to bottom plate;Optical film is sequentially stacked in the light side of light guide plate;Lamp strip component includes FPC board and LED lamp, FPC board includes opposite first side and second side, one end of first side is connected to light side, LED lamp is set to the other end of first side, and it is suspended in the light side of light guide plate;Light shield piece is attached to second side, and one end portion of light shield piece away from side plate is connected on optical film.The backlight module can meet the design requirement of narrow frame, while ensuring the structural strength of backlight module, reducing the risk of its fragment, improving the use safety of display device.

Description

Technical Field

[0001] This utility model relates to the field of display technology, specifically to a backlight module and display device. Background Technology

[0002] Liquid crystal displays (LCDs) have numerous advantages, including slim design, low power consumption, and no radiation, leading to their widespread use. Most LCDs on the market are backlit, consisting of an LCD panel and a backlight module. The LCD panel works by placing liquid crystal molecules between two parallel glass substrates. Numerous fine vertical and horizontal wires connect the substrates, controlling the orientation of the liquid crystal molecules by applying current, thus refracting light from the backlight module to create an image. Since the LCD panel itself does not emit light, it relies on the backlight module to display images; therefore, the backlight module is one of the key structural components of an LCD device.

[0003] like Figure 1 As shown, a backlight module typically includes a backplate 10', a lamp strip assembly 30', and a light guide plate 20'. Light emitted from the lamp strip assembly 30' enters the interior of the light guide plate 20' from its light-incident side 201', and through total internal reflection and scattering principles, the light exits from its light-emitting side 202'. To meet current market demands for thinner LCD panels and narrower bezels, some backlight modules use a thinner side plate 11' on the backplate 10', or even omit it altogether. However, this design increases the risk of backlight module breakage and reduces the safety of the display device.

[0004] In addition, a lampshade structure is also provided over the LEDs 32' of the light strip assembly 30' to guide the light emitted by the LEDs 32' and reflect it onto the light guide plate 20' as much as possible. However, the lampshade structure will affect the narrow bezel design requirements of the backlight module. Furthermore, during use, the light guide plate 20' is prone to rubbing against the lampshade structure due to thermal expansion and contraction, causing defects such as white spots and affecting the display quality of the display device.

[0005] Therefore, there is an urgent need for a backlight module and display device to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a backlight module and display device, which can ensure the uniformity of the display brightness of the display device, meet the narrow bezel design requirements of the backlight module, avoid defects such as white spots caused by the rubbing between the lamp cover structure and the light guide plate, and also ensure the structural strength of the backlight module, reduce the risk of breakage, and improve the safety of the display device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A backlight module, comprising:

[0009] The back panel includes a bottom plate and side plates surrounding the bottom plate, wherein the bottom plate and the side plates enclose an accommodating space;

[0010] A light guide plate is located in the accommodating space and disposed on the base plate;

[0011] Optical films are sequentially stacked on the light-emitting side of the light guide plate;

[0012] The light strip assembly includes an FPC board and an LED light. The FPC board includes a first side and a second side opposite to each other. One end of the first side is connected to the light-emitting side, and the LED light is disposed at the other end of the first side and suspended on the light-incident side of the light guide plate.

[0013] A light-shielding element is attached to the second side, and the end of the light-shielding element facing away from the side plate is connected to the optical film.

[0014] As a preferred embodiment of the backlight module provided by this utility model, the backlight module further includes a support structure, the support structure comprising:

[0015] A supporting horizontal plate is disposed between the light-shielding member and the FPC plate;

[0016] The support plate is perpendicularly connected to the support plate and rests on the top of the side plate.

[0017] As a preferred embodiment of the backlight module provided by this utility model, the support structure is integrally formed on the PCB bracket of the display device.

[0018] As a preferred embodiment of the backlight module provided by this utility model, the supporting horizontal plate and the supporting vertical plate are integrally formed structures.

[0019] As a preferred embodiment of the backlight module provided by this utility model, the supporting structure is made of metal.

[0020] As a preferred embodiment of the backlight module provided by this utility model, the support structure is connected to the side plate by fasteners.

[0021] As a preferred embodiment of the backlight module provided by this utility model, the side plate includes at least two sub-plates, and the at least two sub-plates are arranged along their own thickness direction and connected in sequence.

[0022] As a preferred embodiment of the backlight module provided by this utility model, at least two of the sub-boards are connected sequentially in a serpentine pattern along their own thickness direction.

[0023] As a preferred embodiment of the backlight module provided by this utility model, the FPC board is glued to the light guide plate;

[0024] And / or, the light-shielding element is glued to the FPC plate and the optical film.

[0025] This utility model also provides a display device, including a display panel and a backlight module as described above, wherein the backlight module is used to support the display panel and can provide a backlight source for the display panel.

[0026] The beneficial effects of this utility model are as follows:

[0027] The backlight module provided by this utility model connects the FPC board of the LED strip assembly to the light guide plate, keeping the relative position and gap between the LED strip assembly and the light guide plate fixed. This avoids display fluctuations caused by changes in their relative position and gap, ensuring uniformity of display brightness and providing users with a clearer and more stable visual experience. The light-shielding component ensures that all light emitted by the LEDs hits the light-incident side of the light guide plate, preventing light energy waste and eliminating the need for a lampshade structure. This allows for a further reduction in the distance between the side plate and the light guide plate during manufacturing, achieving the narrow bezel design requirements of the backlight module and preventing defects such as white spots caused by friction between the lampshade structure and the light guide plate. Furthermore, this design retains the side plate while meeting the narrow bezel design requirements, ensuring the structural strength of the backlight module and improving its safety.

[0028] The display device provided by this utility model, by applying the aforementioned backlight module, can meet the design requirements of a narrow bezel for the backlight module, and can ensure the structural strength of the backlight module, reduce the risk of breakage, and improve the safety of the display device; at the same time, it can improve the uniformity of display brightness, so that users can obtain a clearer and more stable visual experience. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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 the content of the embodiments of this utility model and these drawings without creative effort.

[0030] Figure 1This is a partial cross-sectional schematic diagram of a backlight module provided in related technologies;

[0031] Figure 2 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 1 of this utility model;

[0032] Figure 3 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 2 of this utility model;

[0033] Figure 4 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 3 of this utility model;

[0034] Figure 5 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 4 of this utility model.

[0035] Figure label:

[0036] 10' Back panel; 11' Side panel; 20' Light guide plate; 201' Light input side; 202' Light output side; 30' Light strip assembly; 32' LED light;

[0037] 100. PCB bracket; 1001. Bracket body;

[0038] 10. Back panel; 101. Accommodation space; 11. Bottom panel; 12. Side panel; 120. Sub-panel;

[0039] 20. Light guide plate; 201. Light input side; 202. Light output side;

[0040] 30. LED strip assembly; 31. FPC board; 311. First side; 312. Second side; 32. LED light;

[0041] 40. Optical films;

[0042] 50. Sunshades;

[0043] 60. Supporting structure; 61. Supporting horizontal plate; 62. Supporting vertical plate;

[0044] 701, First double-sided adhesive; 702, Second double-sided adhesive;

[0045] 80. Glass plate;

[0046] 90. Reflective film. Detailed Implementation

[0047] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0048] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0049] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0050] In this invention, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0051] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0052] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0053] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0054] Example 1

[0055] Figure 2 A partial cross-sectional view of the backlight module provided in this embodiment is shown. Figure 2 As shown, this embodiment provides a backlight module, which includes a backplate 10, a light guide plate 20, a lamp strip assembly 30, an optical film 40, and a light shield 50. The backplate 10 includes a base plate 11 and side plates 12 surrounding the base plate 11, and the base plate 11 and side plates 12 form an accommodating space 101. The light guide plate 20 is located in the accommodating space 101 and disposed on the base plate 11. The optical film 40 is sequentially stacked on the light-emitting side 2 of the light guide plate 20. 02; The light strip assembly 30 includes an FPC board 31 and an LED light 32. The FPC board 31 includes a first side 311 and a second side 312 opposite to each other. One end of the first side 311 is connected to the light-emitting side 202. The LED light 32 is disposed at the other end of the first side 311 and suspended on the light-incident side 201 of the light guide plate 20. The light shield 50 is attached to the second side 312, and the end of the light shield 50 facing away from the side plate 12 is connected to the optical film 40.

[0056] The backlight module provided in this embodiment connects the FPC board 31 of the LED strip assembly 30 to the light guide plate 20, keeping the relative position and gap between the LED strip assembly 30 and the light guide plate 20 fixed. This avoids display fluctuations caused by changes in their relative position and gap, ensuring uniformity of display brightness and providing users with a clearer and more stable visual experience. The light-shielding member 50 ensures that all light emitted by the LEDs 32 hits the light-incident side 201 of the light guide plate 20. This avoids light energy waste and eliminates the need for a lampshade structure. During actual manufacturing, the distance between the side plate 12 and the light guide plate 20 can be further reduced by the thickness of a lampshade structure, thus meeting the narrow bezel design requirements of the backlight module and preventing defects such as white spots caused by friction between the lampshade structure and the light guide plate 20. Furthermore, this design retains the side plate 12 while meeting the narrow bezel design requirements, ensuring the structural strength of the backlight module and improving its safety.

[0057] In this embodiment, the optical films 40 include, but are not limited to, diffusion films, brightness enhancement films (prism films), reflective films, quantum dot films, etc., which optimize the distribution, direction and color performance of light through synergistic effects, thereby improving the display quality of the display device and enhancing the user experience.

[0058] In some embodiments, there are multiple LEDs 32, which are spaced apart along the length of the FPC board 31. Multiple LEDs 32 can improve the uniformity of brightness in the display device, enhance contrast, improve display performance, extend the lifespan of the backlight module, and improve the user experience.

[0059] In some embodiments, the FPC board 31 is glued to the light guide plate 20 for easy assembly and a stable connection. Specifically, the FPC board 31 is connected to the light guide plate 20 by a first double-sided adhesive 701.

[0060] In some embodiments, the light-shielding component 50 is light-shielding tape. The light-shielding tape can be directly adhered to the FPC board 31 and the optical film 40, facilitating operation and ensuring a secure connection. It is understood that the light-shielding tape not only serves to block light and prevent light leakage, but also helps to fix structures such as the light guide plate 20, the lamp strip assembly 30, and the optical film 40, thereby improving the structural stability of the entire backlight module.

[0061] In some embodiments, the backlight module further includes a glass plate 80, which is located above the optical film 40 and the lamp strip assembly 30 and is connected to the light-shielding member 50. Specifically, the light-shielding member 50 is connected to the glass plate 80 by a second double-sided adhesive 702, which facilitates assembly and ensures a stable connection.

[0062] In some embodiments, a foam structure may be provided between the glass plate 80 and the light shield 50 to provide a buffer for the glass plate 80 and avoid the risk of the glass plate 80 breaking when the backlight module is subjected to external pressure.

[0063] In some embodiments, the backlight module further includes a reflective film 90 disposed between the light guide plate 20 and the base plate 11. The reflective film 90 can reflect light leaking from the light guide plate 20, thereby reducing light loss, increasing backlight brightness, optimizing light distribution, and thus enhancing the display effect of the display device.

[0064] Example 2

[0065] This embodiment provides a backlight module, the specific structure of which is roughly the same as that of the backlight module provided in Embodiment 1, the difference being that the structure of the backplate 10 is different.

[0066] Figure 3 A partial cross-sectional view of the backlight module provided in this embodiment is shown. Figure 3 As shown, in this embodiment, the side panel 12 includes at least two sub-panels 120, which are arranged along their own thickness direction and connected sequentially. This design can further improve the structural strength of the back panel 10. When the backlight module is subjected to external pressure, the multi-layer sub-panels 120 can play a supporting role, thereby reducing the risk of the glass panel 80 breaking.

[0067] In some embodiments, at least two sub-plates 120 are connected sequentially in a serpentine pattern along their thickness direction. This arrangement facilitates molding and ensures the structural integrity of the back plate 10. No other connecting structures are required between adjacent sub-plates 120, simplifying the assembly process and reducing assembly costs. In actual processing, the portion erected on the base plate 11 can be heightened and then bent sequentially to form a multi-layer structure.

[0068] For example, there are two sub-boards 120, with their top ends connected together, and the bottom end of one of the sub-boards 120 connected to the base plate 11. The two sub-boards 120 are formed by bending the sides of the back plate 10 in sequence.

[0069] In some embodiments, at least two sub-boards 120 may also be bonded or welded together, but this embodiment does not limit this.

[0070] In some embodiments, only the side plate 12 near the light-incident side 201 of the light guide plate 20 can be designed as a multi-layer structure to protect the glass plate 80 and the lamp strip assembly 30 disposed on that side, while reducing the amount of back plate 10 used and lowering the material cost of the backlight module. Of course, in other embodiments, all side plates 12 can be designed as multi-layer structures to further increase the structural strength of the backlight module and improve its pressure resistance.

[0071] It is understandable that the multi-layer structure design of the side panel 12 will inevitably increase the thickness of the side panel 12. When processing the back panel 10, the designer can consider designing the side panel 12 as a multi-layer structure or a single-layer structure, provided that the narrow bezel design requirements of the backlight module are met. This embodiment does not limit this.

[0072] Example 3

[0073] This embodiment provides a backlight module, which is a further improvement on the first embodiment.

[0074] Figure 4 A partial cross-sectional view of the backlight module provided in this embodiment is shown, as follows: Figure 4 As shown, the backlight module also includes a support structure 60, which includes a horizontal support plate 61 and a vertical support plate 62. The horizontal support plate 61 is disposed between the light-shielding member 50 and the FPC plate 31; the vertical support plate 62 is perpendicularly connected to the horizontal support plate 61 and rests on the top of the side plate 12. By setting the support structure 60 and having the vertical support plate 62 rest on the top of the side plate 12, the structural strength and compressive strength of the backlight module on the light-incident side 201 of the light guide plate 20 can be increased, further improving the safety of the backlight module and reducing the risk of breakage. By clamping the horizontal support plate 61 between the light-shielding member 50 and the FPC plate 31, the connection stability between the support structure 60 and the back plate 10 can be improved.

[0075] In some embodiments, the support structure 60 is made of metal, which has high structural strength, is easy to form, and has low cost.

[0076] In some embodiments, the supporting horizontal plate 61 and the supporting vertical plate 62 are integrally formed, which is convenient for processing and can eliminate the need for connectors used to connect the two, reducing processing costs and ensuring the structural strength of the supporting structure 60.

[0077] In some embodiments, the support structure 60 is connected to the side plate 12 by fasteners, which is simple and secure.

[0078] In some embodiments, the support plate 61 can be glued to the FPC plate 31 and the light shield 50 for easy assembly and secure connection.

[0079] Example 4

[0080] This embodiment provides a backlight module. The specific structure of the backlight module is roughly the same as that of the backlight module provided in Embodiment 1. The difference is that the support structure 60 is formed in a different way.

[0081] Figure 5 A partial cross-sectional view of the backlight module provided in Embodiment 4 is shown. Figure 5 As shown, in this embodiment, the support structure 60 is integrally formed on the PCB bracket 100 of the display device. By improving the structure of the PCB bracket 100, it not only supports the PCB board but also raises the side plate 12. This arrangement can further simplify the processing steps, improve assembly efficiency, and ensure the structural strength of the backlight module.

[0082] It should be noted that the specific connection method of the PCB bracket 100 is as described in Embodiment 5, and will not be repeated in this embodiment.

[0083] Example 5

[0084] This embodiment provides a display device, which includes a display panel and a backlight module. The backlight module supports the display panel and provides a backlight source for the display panel. The backlight module can be any of the backlight modules described in Embodiments 1, 2, 3, or 4. By using the aforementioned backlight module, on the one hand, the uniformity of the display brightness of the display device can be ensured, providing users with a clearer and more stable visual experience; on the other hand, it can meet the narrow bezel design requirements of the backlight module and avoid defects such as white spots caused by scratches between the lamp cover structure and the light guide plate; furthermore, it can ensure the structural strength of the backlight module, reduce the risk of breakage, and improve the safety of the display device.

[0085] Further, refer to Figure 5 The display device also includes a PCB board and a PCB bracket 100. The PCB bracket 100 is disposed on one side of the backlight module, and the PCB board is disposed on the PCB bracket 100. One end of the FPC board 31 away from the light guide plate 20 passes through the back plate 10 and is electrically connected to one end of the PCB board. The other end of the PCB board is electrically connected to the display panel. The backlight module is used to provide a backlight source for the display panel, and the display panel is used to display images.

[0086] When the display device uses the backlight module in Embodiment 4, the PCB bracket 100 includes a bracket body 1001 and a support structure 60. The bracket body 1001 is located on one side of the backlight module and is used to mount the PCB board. The support structure 60 is integrally formed on the bracket body 1001, and the support horizontal plate 61 of the support structure 60 is disposed between the light shield 50 and the FPC board 31. The support vertical plate 62 of the support structure 60 is supported on the top of the side plate 12. The PCB bracket 100 can support the PCB board, and the setting of its support vertical plate 62 can increase the height of the side plate 12, thereby further improving the structural strength and compressive strength of the backlight module on the light-incident side 201 of the light guide plate 20.

[0087] Optionally, the side plate 12 is also provided with clearance holes for the FPC board 31 to pass through.

[0088] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A backlight module, characterized in that, include: The back panel (10) includes a bottom panel (11) and side panels (12) surrounding the bottom panel (11), and the bottom panel (11) and the side panels (12) form an accommodating space (101). A light guide plate (20) is located in the accommodating space (101) and disposed on the base plate (11). Optical films (40) are sequentially stacked on the light-emitting side (202) of the light guide plate (20). The light strip assembly (30) includes an FPC board (31) and an LED lamp (32). The FPC board (31) includes a first side (311) and a second side (312) opposite to each other. One end of the first side (311) is connected to the light-emitting side (202). The LED lamp (32) is disposed at the other end of the first side (311) and suspended on the light-incident side (201) of the light guide plate (20). A light-shielding member (50) is attached to the second side (312), and the end portion of the light-shielding member (50) facing away from the side plate (12) is connected to the optical film (40).

2. The backlight module according to claim 1, characterized in that, The backlight module further includes a support structure (60), the support structure (60) comprising: A support plate (61) is disposed between the light-shielding member (50) and the FPC plate (31); The support plate (62) is perpendicularly connected to the support plate (61) and is supported on the top of the side plate (12).

3. The backlight module according to claim 2, characterized in that, The support structure (60) is integrally formed on the PCB bracket (100) of the display device.

4. The backlight module according to claim 2, characterized in that, The supporting horizontal plate (61) and the supporting vertical plate (62) are integrally formed structures.

5. The backlight module according to claim 4, characterized in that, The support structure (60) is made of metal.

6. The backlight module according to claim 2, characterized in that, The support structure (60) is connected to the side plate (12) by fasteners.

7. The backlight module according to claim 1, characterized in that, The side plate (12) includes at least two sub-plates (120), and the at least two sub-plates (120) are arranged along their own thickness direction and connected in sequence.

8. The backlight module according to claim 7, characterized in that, At least two of the sub-plates (120) are connected in a serpentine manner along their own thickness direction.

9. The backlight module according to any one of claims 1 to 5, characterized in that, The FPC board (31) is glued to the light guide plate (20); And / or, the light-shielding element (50) is glued to the FPC plate (31) and the optical film (40).

10. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 1 to 9, wherein the backlight module is used to support the display panel and can provide a backlight source for the display panel.

Images