Backlight module and display device

Abstract

The utility model discloses a backlight module and a display device, and belongs to the technical field of display. The backlight module comprises a back plate, a light guide plate, a light bar assembly and a shading reflecting part, wherein an accommodating space is formed on the back plate; the light bar assembly is arranged in the containing space, the light bar assembly comprises a circuit board and LED lamps, and the LED lamps are arranged on one side of the circuit board at intervals in the length direction of the circuit board; the light guide plate comprises a light guide body and a plurality of extension parts, the light guide body is connected to the other side of the circuit board, the side, facing the LED lamps, of the light guide body is a light incident side, the extension parts are all arranged on the light incident side and distributed at intervals in the length direction of the light incident side, and a containing groove used for containing the LED lamps is formed between every two adjacent extension parts; the shading reflecting piece is annular and wraps the LED lamp, part of the circuit board, the extending part and part of the light guide body. The backlight module is good in structural stability, and the finished product quality of the backlight module and the display effect of the display device can be guaranteed.

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) possess numerous advantages such as thinness, energy efficiency, and no radiation, and are widely used in electronic devices such as high-definition digital televisions, desktop computers, personal digital assistants (PDAs), laptops, mobile phones, and digital cameras. Most LCD devices in related technologies are backlit LCDs, which consist of a liquid crystal panel and a backlight module. The working principle of an LCD panel involves placing liquid crystal molecules between two parallel glass substrates. Numerous vertical and horizontal fine wires are positioned between the two glass substrates. By controlling whether or not electricity is applied, the orientation of the liquid crystal molecules is changed, refracting light from the backlight module to produce an image. Since the LCD panel itself does not emit light, it requires a light source provided by the backlight module to display images properly; therefore, the backlight module is one of the key structural components of an LCD device.

[0003] Figure 1 A partial cross-sectional schematic diagram of a backlight module provided by related technologies is shown. For example... Figure 1 As shown, the backlight module in the related technology typically includes a backplate 100', a light guide plate 200', and a light strip assembly 300'. The backplate 100' includes a base plate 110' and a side plate 120' erected on the base plate 110'. A receiving space 1001' is formed between the base plate 110' and the side plate 120'. The light guide plate 200' is disposed in the receiving space 1001'. The light strip assembly... 300' includes an FPC board 310' and a plurality of LEDs 320' disposed on the FPC board 310'. The plurality of LEDs 320' are spaced apart along the length of the FPC board 310', and the FPC board 310' is partially inserted between the light guide plate 200' and the base plate 110', and the FPC board 310' and the light guide plate 200' are bonded together with double-sided adhesive 400'. With the above arrangement, during RA testing of the finished backlight module, the LEDs 320' are easily displaced relative to the light guide plate 200', affecting the finished quality of the backlight module, and thus causing uneven backlight brightness in the display device, affecting the user experience.

[0004] To solve the above problems, the following technical solutions are commonly used in related technologies:

[0005] 1) Increase the thickness of the double-sided adhesive by 400' to improve the coupling between the LED lamp 320' and the light guide plate 200', thereby reducing the probability of relative displacement between the two during RA testing. However, this setting will increase the overall thickness of the backlight module to some extent, making it impossible to achieve the narrow bezel design requirement of the backlight module.

[0006] 2) Replace the LED with a 320' model, i.e., use a higher brightness LED. However, this will increase the manufacturing cost of the backlight module, and the higher the brightness of the LED, the greater the current, and the higher the temperature rise will be, which may cause the 400' double-sided adhesive to crack and fail during RA testing.

[0007] Therefore, there is an urgent need for a backlight module to solve the above problems. Utility Model Content

[0008] The purpose of this utility model is to provide a backlight module and display device that can prevent relative displacement between LED lamps and light guide plates during use, thereby ensuring the finished product quality of the backlight module and the display effect of the display device. At the same time, it can meet the narrow bezel design requirements of the backlight module and reduce processing costs to a certain extent.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A backlight module, comprising:

[0011] A back plate having an accommodating space formed thereon;

[0012] A light strip assembly is disposed in the accommodating space. The light strip assembly includes a circuit board and LED lights, and a plurality of LED lights are spaced apart along the length direction of the circuit board on one side of the circuit board.

[0013] A light guide plate includes a light guide body and several extensions. The light guide body is connected to the other side of the circuit board. The side of the light guide body facing the LED is the light-incident side. Several extensions are all disposed on the light-incident side and are arranged at intervals along the length direction of the light-incident side. A receiving groove for accommodating the LED is formed between two adjacent extensions.

[0014] The light-shielding reflector is ring-shaped and wraps around the LED light, part of the circuit board, the extension, and part of the light guide body.

[0015] As a preferred embodiment, the light-shielding reflector includes a substrate and a silver-plated layer disposed on the surface of the substrate, the silver-plated layer being disposed on the side facing the light strip assembly and the light guide plate.

[0016] As a preferred embodiment, the light-shielding reflector is bonded to the light strip assembly and the light guide plate.

[0017] As a preferred embodiment, the width of the light-shielding reflector covering the light guide body is 1mm to 3mm.

[0018] As a preferred embodiment, the end corner of the extension is transitioned with an arc-shaped surface.

[0019] As a preferred embodiment, both the light guide body and the extension are adhered to the circuit board.

[0020] As a preferred embodiment, the light guide plate further includes a connecting portion, wherein the ends of two adjacent extensions that are away from the light guide body are connected by the corresponding connecting portion.

[0021] As a preferred embodiment, the light guide body, the extension, and the connecting part are an integral structure.

[0022] As a preferred embodiment, the light-shielding reflector is also wrapped around the outer periphery of the connecting portion.

[0023] 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.

[0024] The beneficial effects of this utility model are as follows:

[0025] The backlight module provided by this utility model has several extensions on the light-incident side of the light guide body, and a receiving groove for accommodating the corresponding LED light can be formed between two adjacent extensions. On the one hand, the receiving groove can accommodate and limit the LED light, thereby reducing the movable space of the LED light and preventing relative displacement between the LED light and the light guide plate during the use of the backlight module. On the other hand, the extensions can also increase the connection area between the light guide plate and the circuit board, further improving the stability of the connection between the light guide plate and the light strip assembly. By setting a light-shielding reflector, it can be ensured that all the light emitted by the LED light hits the light-incident side of the light guide plate, avoiding light energy waste. Therefore, in actual production, it is not necessary to use high-brightness LED lights, thereby reducing processing costs to a certain extent. In addition, by setting a light-shielding reflector, the setting of the reflective film in related technologies can be omitted, thereby meeting the narrow bezel design requirements of the backlight module.

[0026] The display device provided by this utility model, by applying the above-mentioned backlight module, can avoid relative displacement between LED lamps and light guide plates during use, thereby ensuring the finished product quality of the backlight module and the display effect of the display device. At the same time, it can meet the narrow bezel design requirements of the backlight module and reduce processing costs to a certain extent. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a partial cross-sectional schematic diagram of the backlight module provided by related technologies;

[0029] Figure 2 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 1 of this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the light guide plate provided in Embodiment 1 of this utility model;

[0031] Figure 4 yes Figure 3 Partial structural diagram;

[0032] Figure 5 This is a partial cross-sectional schematic diagram of the backlight module provided in Embodiment 2 of this utility model;

[0033] Figure 6 This is a top view schematic diagram of the light guide plate provided in Embodiment 2 of this utility model;

[0034] Figure 7 yes Figure 6 A partial structural diagram.

[0035] Figure label:

[0036] 100' Backplate; 1001' Accommodation space; 110' Base plate; 120' Side plate; 200' Light guide plate; 300' Light strip assembly; 310' FPC board; 320' LED light; 400' Double-sided adhesive; 500' Reflective film;

[0037] 100. Back panel; 1001. Accommodation space; 110. Base plate; 120. Side panel;

[0038] 200, light guide plate; 210, light guide body; 2101, light incident side; 220, extension; 2201, receiving groove; 230, connecting part;

[0039] 300. LED strip assembly; 310. Circuit board; 320. LED light;

[0040] 400. Double-sided tape;

[0041] 500. Light-shielding and reflective components. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Example 1

[0050] Figure 2 A partial cross-sectional view of the backlight module provided in this embodiment is shown. Figure 3 A schematic diagram of the structure of the light guide plate 200 provided in this embodiment is shown. Figure 4 It shows Figure 3 A partial structural diagram. (See attached diagram.) Figures 2-4As shown, this embodiment provides a backlight module, which includes a backplate 100, a light guide plate 200, a light strip assembly 300, and a light-shielding reflector 500. A receiving space 1001 is formed on the backplate 100. The light strip assembly 300 is disposed in the receiving space 1001 and includes a circuit board 310 and LED lights 320. A plurality of LED lights 320 are spaced apart along the length of the circuit board 310 on one side of the circuit board 310. The light guide plate 200 includes a light guide body 210 and a plurality of extensions 220, guiding light... The main body 210 is connected to the other side of the circuit board 310. The side of the light guide body 210 facing the LED lamp 320 is the light-incident side 2101. Several extensions 220 are disposed on the light-incident side 2101 and are arranged at intervals along the length direction of the light-incident side 2101. A receiving groove 2201 for accommodating the LED lamp 320 is formed between two adjacent extensions 220. The light-shielding reflector 500 is annular and wraps around the LED lamp 320, part of the circuit board 310, the extensions 220 and part of the light guide body 210.

[0051] The backlight module provided in this embodiment has several extensions 220 on the light-incident side 2101 of the light guide body 210, and a receiving groove 2201 for accommodating the corresponding LED lamp 320 can be formed between two adjacent extensions 220. On the one hand, the receiving groove 2201 can accommodate and limit the LED lamp 320, thereby reducing the movable space of the LED lamp 320 and preventing the LED lamp 320 from being relatively displaced from the light guide plate 200 during the use of the backlight module. On the other hand, the extensions 220 can also... To increase the connection area between the light guide plate 200 and the circuit board 310, the stability of the connection between the light guide plate 200 and the lamp strip assembly 300 is further improved. By setting the light-shielding reflector 500, it can be ensured that all the light emitted by the LED lamp 320 hits the light-incident side 2101 of the light guide plate 200, avoiding light energy waste. Therefore, in actual production, it is not necessary to select a high-brightness LED lamp 320, thereby reducing processing costs to a certain extent. Furthermore, by setting the light-shielding reflector 500, the reflective film 500' in related technologies can also be omitted (see reference). Figure 1 The settings are configured to meet the narrow bezel design requirements of the backlight module.

[0052] Optionally, in this embodiment, the circuit board 310 is an FPC board. Of course, in other embodiments, the circuit board 310 can also be a PCB board. It should be noted that the FPC board, PCB board, and LED light 320 are all prior art, and the specific structure and working principle of the FPC board, PCB board, and LED light 320 will not be described in detail in this embodiment.

[0053] like Figure 2As shown, the back panel 100 includes a base plate 110 and side plates 120 surrounding the base plate 110. The base plate 110 and side plates 120 together form the aforementioned accommodating space 1001. The circuit board 310 is connected to the inner side of the base plate 110 and is attached to the base plate 110 via double-sided adhesive 400. This design is simple, easy to operate, and provides a stable connection.

[0054] In this embodiment, the light-shielding reflector 500 includes a substrate and a silver-plated layer disposed on the surface of the substrate, with the silver-plated layer facing the side of the lamp strip assembly 300 and the light guide plate 200. The silver layer has high reflectivity, which can reflect the light emitted by the LED lamp 320, ensuring that most of the light reaches the light-incident side 2101 of the light guide plate 200, thus avoiding light energy waste. Optionally, the substrate is generally made of polyethylene terephthalate (PET) film, which has good optical transparency and mechanical strength. To prevent the light-shielding reflector 500 from being scratched, a protective layer is also coated on the surface of the silver-plated layer to improve the durability and scratch resistance of the light-shielding reflector 500, thereby extending its service life. Optionally, the protective layer can be an optically transparent adhesive or other transparent resin material.

[0055] In this embodiment, the light-shielding reflector 500 is adhered to the light strip assembly 300 and the light guide plate 200, which facilitates operation and ensures a stable connection.

[0056] It should be explained that the surfaces of the light-shielding reflector 500 that enclose the LED strip assembly 300 and the light guide plate 200 include the upper surfaces of all LEDs 320, the upper surfaces of all extensions 220, the outer sides of the two extensions 220 at both ends, a portion of the bottom surface of the circuit board 310, and a portion of the upper surface, sides, and bottom surface of the light guide body 210. The light-shielding reflector 500 partially encloses the light guide body 210 to ensure the light-shielding effect of the light-shielding reflector 500 on the LEDs 320, preventing the light emitted by the LEDs 320 from escaping through the gap between the LEDs 320 and the light guide body 210, thereby affecting the display effect of the display device.

[0057] Optionally, the width of the light-shielding reflector 500 covering the light guide body 210 is 1mm to 3mm. This width range can reduce the material used in the light-shielding reflector 500 while achieving a good light-shielding and reflection effect, thereby reducing the processing cost of the backlight module to a certain extent. For example, the width of the light-shielding reflector 500 covering the light guide body 210 can be 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, or 2.9mm. Of course, in other embodiments, the width of the light-shielding reflector 500 covering the light guide body 210 is not limited to the above range, and designers can adjust it according to requirements.

[0058] Continue as Figure 2 and Figure 4 As shown, the end corner of the extension 220 uses a curved surface transition. This design prevents the sharp corner of the extension 220 from scratching the LED 320 during backlight module assembly. The curved surface on the extension 220 provides good protection, thus ensuring the appearance quality and performance of the LED 320. Furthermore, by providing a curved surface at the end of the extension 220, the opening of the receiving groove 2201 formed between two adjacent extensions 220 is flared, facilitating safe assembly between the LED 320 and the light guide plate 200.

[0059] Optionally, in this embodiment, the light guide body 210 and the extension 220 are an integral structure, which saves the connection structure between the light guide body 210 and the extension 220, thereby reducing the number of parts, simplifying the assembly process, and making installation simple, while also helping to improve the overall strength of the light guide plate 200.

[0060] To achieve a stable connection between the light guide plate 200 and the circuit board 310, both the light guide body 210 and the extension 220 are adhered to the circuit board 310. This design is simple, easy to operate, and provides a secure connection. Specifically, the light guide body 210 and the circuit board 310, as well as the extension 220 and the circuit board 310, are connected using double-sided adhesive 400. This method is readily available, provides good adhesion, and can reduce processing costs to some extent.

[0061] The backlight module provided in this embodiment has the following advantages: 1) By setting the extension 220, a receiving groove 2201 for accommodating the corresponding LED lamp 320 is formed. On the one hand, it can limit the LED lamp 320, and on the other hand, it can increase the connection area between the light guide plate 200 and the circuit board 310, thereby improving the stability of the connection between the light guide plate 200 and the lamp strip assembly 300; 2) By setting the light-shielding reflector 500, the setting of the reflective film 500' in the related technology can be omitted. It has been verified that this design can provide a light guide plate 200 with a thickness greater than 0.1mm in the thickness direction of the backlight module. The thermal expansion space allows for minimizing the size of the backlight module in other directions, thus meeting the narrow bezel design requirements of the backlight module; 3) By setting the light-shielding reflector 500 in a ring shape and fully enclosing it around the light strip assembly 300, the extension 220, and part of the light guide body 210, the coupling between the light guide plate 200 and the LED lamp 320 can be further increased. This design can always bind the light guide plate 200 and the LED lamp 320 as a whole, which not only facilitates the assembly of the LED lamp 320 but also reduces the risk of separation between the light guide plate 200 and the LED lamp 320 due to thermal expansion after brightness increase and RA testing.

[0062] Example 2

[0063] This embodiment provides a backlight module, the specific structure of which is roughly the same as that of the backlight module in Embodiment 1, the difference being that the structure of the light guide plate 200 is different.

[0064] Figure 5 A partial cross-sectional view of the backlight module provided in this embodiment is shown. Figure 6 A top view of the light guide plate 200 provided in this embodiment is shown. Figure 7 It shows Figure 6 A partial structural diagram. (See attached diagram.) Figures 5-7 As shown, in this embodiment, the light guide plate 200 further includes a connecting portion 230, and the ends of two adjacent extensions 220 that are away from the light guide body 210 are connected by the corresponding connecting portion 230. Compared with the first embodiment, by providing the connecting portion 230, the light guide body 210, the two adjacent extensions 220, and the corresponding connecting portion 230 can form an annular receiving space. The LED lamp 320 is received in this annular receiving space, which can further reduce the movable space of the LED lamp 320, thereby improving the limiting effect on the LED lamp 320 and preventing it from being relatively displaced from the light guide plate 200 during use.

[0065] Optionally, the light-shielding reflector 500 also wraps around the outer periphery of the connecting portion 230. On the one hand, it can prevent the light emitted by the LED lamp 320 from being emitted from the gap between the connecting portion 230 and the LED lamp 320, thereby further improving the light-shielding effect and avoiding light energy waste. On the other hand, it can also increase the contact and connection area between the light-shielding reflector 500 and the light guide plate 200, further reducing the probability of optical defects in the backlight module.

[0066] Optionally, the light guide body 210, the extension 220, and the connecting part 230 are integrated into one piece, which saves the connection structure between the light guide body 210, the extension 220, and the connecting part 230, thereby reducing the number of parts, simplifying the assembly process, and making installation simple, while also improving the overall strength of the light guide plate 200.

[0067] Example 3

[0068] This embodiment provides a display device, which may be, but is not limited to, a liquid crystal display (LCD), an LCD television, or an advertising display. Specifically, the display device includes an LCD panel and a backlight module. The backlight module supports the LCD panel and provides a backlight source for the LCD panel. The backlight module can be any of the backlight modules described in the above embodiments. By using the aforementioned backlight module, relative displacement between the LED lamp 320 and the light guide plate 200 during use can be avoided, thereby ensuring the finished product quality of the backlight module and the display effect of the display device. Simultaneously, it can meet the narrow bezel design requirements of the backlight module and reduce processing costs to a certain extent.

[0069] 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: A back plate (100) having an accommodating space (1001) formed thereon; A light strip assembly (300) is disposed in the accommodating space (1001). The light strip assembly (300) includes a circuit board (310) and LED lights (320). A plurality of LED lights (320) are spaced apart on one side of the circuit board (310) along the length direction of the circuit board (310). A light guide plate (200) includes a light guide body (210) and a plurality of extensions (220). The light guide body (210) is connected to the other side of the circuit board (310). The side of the light guide body (210) facing the LED lamp (320) is the light-incident side (2101). The plurality of extensions (220) are all disposed on the light-incident side (2101) and are arranged at intervals along the length direction of the light-incident side (2101). A receiving groove (2201) for accommodating the LED lamp (320) is formed between two adjacent extensions (220). The light-shielding reflector (500) is ring-shaped and is wrapped around the LED lamp (320), part of the circuit board (310), the extension (220) and part of the light guide body (210).

2. The backlight module according to claim 1, characterized in that, The light-shielding reflector (500) includes a substrate and a silver plating layer disposed on the surface of the substrate, the silver plating layer being disposed on the side facing the light strip assembly (300) and the light guide plate (200).

3. The backlight module according to claim 2, characterized in that, The light-shielding reflector (500) is bonded to the light strip assembly (300) and the light guide plate (200).

4. The backlight module according to claim 1, characterized in that, The width of the light-shielding reflector (500) covering the light guide body (210) is 1mm to 3mm.

5. The backlight module according to claim 1, characterized in that, The end corner of the extension (220) is transitioned with an arc-shaped surface.

6. The backlight module according to claim 1, characterized in that, The light guide body (210) and the extension (220) are both adhered to the circuit board (310).

7. The backlight module according to any one of claims 1 to 6, characterized in that, The light guide plate (200) also includes a connecting part (230), and the ends of two adjacent extensions (220) that are away from the light guide body (210) are connected by the corresponding connecting part (230).

8. The backlight module according to claim 7, characterized in that, The light guide body (210), the extension (220), and the connecting part (230) are an integral structure.

9. The backlight module according to claim 7, characterized in that, The light-shielding reflector (500) is also wrapped around the outer periphery of the connecting part (230).

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.

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