Backlight module and display device

Abstract

Embodiments of the present application provide a backlight module and a display device, and relate to the technical field of display. The purpose is to improve the problem that the middle frame of the backlight module easily falls down in the related art, thereby causing the light leakage of the display device in the dark state. The backlight module comprises a back plate, a light guide plate, a support and a middle frame. The light guide plate is located on the back plate, and an opening is formed in the side surface of the light guide plate. The support passes through the opening and is supported on the back plate. The middle frame is supported on the support and is used for supporting a display panel.

Description

Technical Field

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

[0002] In liquid crystal display devices, the backlight module is the core component that provides the light source. Its optical performance directly determines the display effect of the display panel, such as brightness uniformity, contrast, and light leakage control. Existing backlight modules typically include a back plate, a light guide plate on the back plate, and a mid-frame (or plastic frame) for supporting the display panel. The function of the light guide plate is to conduct and homogenize the light emitted by the light source to achieve the output of a surface light source.

[0003] In related technologies, the mid-frame is mainly connected to the back panel or other components via its edges, and the mid-frame usually maintains a certain gap with the light guide plate or optical film located below it. This causes the suspended part of the backlight module to easily sag and deform during assembly due to the weight of the mid-frame itself or external assembly stress. This deformation is directly transmitted to the display panel supported above, resulting in light leakage when the display device is in a dark state, which seriously affects the contrast and image quality of the displayed picture. Utility Model Content

[0004] This application provides a backlight module and a display device to improve the problem in the related art where the middle frame of the backlight module is prone to sagging, resulting in light leakage in the dark state of the display device.

[0005] On one hand, embodiments of this application provide a backlight module, including:

[0006] Back panel;

[0007] A light guide plate is located on the back plate, and an opening is provided on the side of the light guide plate;

[0008] A support member, passing through the opening and supported on the back plate; and

[0009] The middle frame is supported on the support member and is used to support the display panel.

[0010] In some embodiments, the backlight module further includes a light source disposed on the back plate and located on one side of the light guide plate, the opening includes a first sub-opening located on the side of the light guide plate near the light source, the support includes a first sub-support located within the first sub-opening, the first sub-support being connected to the back plate and abutting against the bottom wall of the first sub-opening.

[0011] In some embodiments, the first sub-support is a transparent support.

[0012] In some embodiments, the light source includes a circuit board and a plurality of sub-light sources, the plurality of sub-light sources being located on the circuit board and spaced apart along the length of the circuit board, and the first sub-support member being offset from the plurality of sub-light sources.

[0013] In some embodiments, the width of the first sub-support member is greater than or equal to 0.4 mm and less than or equal to 1 mm.

[0014] In some embodiments, the opening further includes a second sub-opening located on the side of the light guide plate away from the light source, and the support includes a second sub-support located within the second sub-opening, the second sub-support being connected to the back plate and abutting against the bottom wall of the second sub-opening.

[0015] In some embodiments, the support member has a chamfer on the side near the back plate.

[0016] In some embodiments, the depth of the opening is the same as the length of the support.

[0017] In some embodiments, the width of the opening is the same as the width of the support member.

[0018] In some embodiments, the back plate includes a base plate portion and a side plate portion that are bent and connected. The light guide plate and the support member are both supported on the base plate portion. The side plate portion is spaced apart from the support member, and the middle frame is also supported on the side plate portion.

[0019] On the other hand, embodiments of this application also provide a display device, which includes a backlight module as described in any of the above embodiments.

[0020] For the backlight module provided in this application embodiment, by setting a support member to support the middle frame, the problem of the middle frame being suspended and sagging can be effectively avoided, thereby improving the problem of light leakage in the dark state of the display panel due to deformation of the middle frame. Furthermore, since the side of the light guide plate has an opening for placing the support member, the problem of mutual squeezing caused by positional interference between the support member and other components (such as the light source) between the light guide plate and the back plate can be avoided. In addition, the cooperation between the support member and the opening also helps to improve the assembly efficiency of the backlight module. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1It is a cross-sectional view of a display device based on related technologies;

[0023] Figure 2 These are cross-sectional views of a display device provided in some embodiments of this application;

[0024] Figure 3 This is a diagram showing the relative positions of the light source, support member, and opening according to some embodiments of this application;

[0025] Figure 4 This is another relative positional relationship diagram of the light source, support member, and opening according to some embodiments of this application. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The described technical solutions are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different technical features. The term "multiple" and similar words indicate two or more, unless otherwise expressly defined.

[0028] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0029] In this application, the term "example" is used to mean "used as an example, illustration, or illustration." Any embodiment described as "example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application.

[0030] The various embodiments of this application are similar, and features from different embodiments and / or different examples can be combined with each other.

[0031] In related technologies, such as Figure 1As shown, the backlight module includes a back plate 011, a light guide plate 012 and an optical film 013 stacked on the back plate 011, and a middle frame 014 connected to the back plate 011. The middle frame 014 is used to support the display panel 02 so that the backlight module and the display panel 02 maintain a certain distance.

[0032] To prevent the mid-frame 014 from rubbing against the optical film 013 located below it, foam 015 is provided on the side of the mid-frame 014 near the light guide plate 012. A certain gap (usually controlled within the range of 0.05mm to 0.2mm) is typically required between the foam 015 and the optical film 013 to prevent warping under high temperature or high humidity conditions after the mid-frame 014 presses against the optical film 013. However, the presence of this gap, along with the cavity 0110 located below the edge of the light guide plate 012, can cause the suspended portion of the mid-frame 014 to sag and deform during assembly due to its own weight or external assembly stress, leading to dark light leakage and other display abnormalities in the display panel.

[0033] Based on this, some embodiments of this application provide a backlight module, such as... Figure 2 As shown, the backlight module 100 includes a back plate 11, a light guide plate 12, a support member 13, and a middle frame 14. The light guide plate 12 is located on the back plate 11, and an opening 120 is formed on the side of the light guide plate 12; the support member 13 passes through the opening 120 of the light guide plate 12 and is supported on the back plate 11; the middle frame 14 is supported on the support member 13 and is used to carry and support the display panel 200 (such as a liquid crystal display panel).

[0034] In this embodiment, by providing a support member 13 to support the middle frame 14, the problem of the middle frame 14 being suspended and sagging can be effectively avoided, thereby improving the problem of light leakage in the dark state of the display panel 200 due to deformation of the middle frame 14. Furthermore, since the light guide plate 12 has an opening 120 on its side for placing the support member 13, the problem of mutual compression between the support member 13 and other components (such as the light source 15) between the light guide plate 12 and the back plate 11 can be avoided. In addition, the cooperation between the support member 13 and the opening 120 also helps to improve the assembly efficiency of the backlight module 100.

[0035] In some examples, the support 13 can be pre-installed on the back plate 11. When installing the light guide plate 12, the opening 120 of the light guide plate 12 can be aligned with the position of the support 13 to achieve the positioning of the light guide plate 12, thereby improving the assembly efficiency of the light guide plate 12.

[0036] In other examples, the light guide plate 12 can be pre-installed on the back plate 11. When installing the support member 13, the support member 13 can be aligned with the opening 120 of the light guide plate 12 to achieve the positioning of the support member 13, thereby improving the assembly efficiency of the support member 13.

[0037] As an example, the support member 13 is connected to the middle frame 14. This enhances the structural stability between the two and improves the assembly efficiency of the backlight module 100. For instance, the support member 13 and the middle frame 14 can be integrally formed. This allows the support member 13 and the middle frame 14 to be positioned and installed as a whole after the light guide plate 12 is pre-installed, thereby increasing the installation speed of the support member 13 and the middle frame 14.

[0038] In some embodiments, please continue reading Figure 2 The support member 13 has a chamfer 1301 on the side near the back plate 11. Exemplarily, the support member 13 includes an upper surface and a lower surface disposed opposite each other along its height direction, and a front surface and a rear surface disposed opposite each other along its length direction, wherein the lower surface contacts the back plate 11. At least one of the front surface and the rear surface is connected to the lower surface by a first transition plane, and the angle between the first transition plane and the lower surface is an obtuse angle.

[0039] By setting a chamfer 1301 on the side of the support member 13 near the back plate 11, it can alleviate the scratches caused by the sharp corner of the support member 13 to the light guide plate 12; on the other hand, it can also facilitate the smooth insertion of the support member 13 into the opening 120 of the light guide plate 12 during the assembly process, reduce assembly resistance, and improve assembly efficiency.

[0040] In some examples, the support member 13 also includes a left side surface and a right side surface disposed opposite each other along its width direction, at least one of the left side surface and the right side surface being connected to the lower surface by a second transition plane, the angle between the second transition plane and the lower surface being an obtuse angle. By increasing the number of chamfers, the sharp corners of the support member 13 can be further reduced to prevent scratches on the light guide plate 12, and the support member 13 can be assembled smoothly.

[0041] As an example, the support member 13 can be bonded to the back plate 11. This can improve the assembly efficiency between the support member 13 and the back plate 11.

[0042] In some embodiments, please continue reading Figure 2 The back panel 11 includes a base plate portion 111 and a side plate portion 112 that are bent and connected. The light guide plate 12 and the support member 13 are both supported on the base plate portion 111. The side plate portion 112 and the support member 13 are spaced apart, and the middle frame 14 is also supported on the side plate portion 112.

[0043] With this configuration, the side panel 112 and the support member 13 can provide dual support for the middle frame 14, thereby further improving structural stability and reducing the risk of the middle frame 14 collapsing due to the failure of a single support.

[0044] In some examples, the extending direction of the base plate portion 111 may be perpendicular to the extending direction of the side plate portion 112. The base plate portion 111 may include a bent and connected main body portion and an edge portion, forming a step between the main body portion and the edge portion. The light guide plate 12 is located on the main body portion, and the support member 13 is located on the edge portion. The edge portion may also be used to mount the light source 15, such that the light emission height of the light source 15 is adapted to the light incident surface of the light guide plate 12.

[0045] In some examples, the backlight module 100 also includes an optical film 16 located on the light guide plate 12, which may include, for example, a diffusion film and a brightness enhancement film. Furthermore, the optical film 16 is spaced apart from the support member 13. For example, the optical film 16 is spaced apart from the support member 13 in its thickness direction, thus preventing friction between the support member 13 and the optical film 16. The optical film 16 is also spaced apart from the support member 13 in its planar direction, which helps to provide expansion space for the optical film 16 under high temperature or high humidity conditions, thereby preventing the expansion of the optical film 16 from affecting the support member 13.

[0046] In some examples, the middle frame 14 includes a bent-connected support portion 141 and an overlap portion 142, the support portion 141 being supported on the side plate portion 112 and the support member 13, and the overlap portion 142 being located on the side of the side plate portion 112 away from the support member 13. Exemplarily, the extending direction of the support portion 141 may be perpendicular to the extending direction of the overlap portion 142.

[0047] In some embodiments, such as Figure 2 and Figure 3 As shown, the backlight module 100 also includes a light source 15 disposed on the back plate 11 and located on one side of the light guide plate 12. In this case, the backlight module 100 is a side-lit backlight. The side of the light guide plate 12 near the light source 15 is the light-incident surface, while the side of the light guide plate 12 facing the display panel 200 is the light-emitting surface.

[0048] The opening 120 on the light guide plate 12 includes at least one first sub-opening 1201, which is located on the side of the light guide plate 12 closer to the light source 15; correspondingly, the support member 13 includes a first sub-support member 131, which is located inside the first sub-opening 1201, and the first sub-support member 131 is connected to the back plate 11 and abuts against the bottom wall of the first sub-opening 1201.

[0049] In related technologies, a stop is typically provided on the side of the light guide plate 12 near the light source 15 to ensure a certain optical coupling distance between the light source 15 and the light guide plate 12, and to prevent the backlight module 100 from colliding with the light source 15 due to the shaking of the light guide plate 12 during transportation. In this embodiment, since the first sub-support 131 is located within the first sub-opening 1201 and abuts against the bottom wall of the first sub-opening 1201, the first sub-support 131 can block the light guide plate 12, maintaining a certain optical coupling distance between the light guide plate 12 and the light source 15, and preventing the backlight module 100 from colliding with the light source 15 due to the shaking of the light guide plate 12 during transportation. Therefore, the first sub-support 131 in this embodiment can replace the stop, thereby reducing the number of components in the backlight module 100 and lowering the manufacturing cost of the backlight module 100.

[0050] In some examples, please refer to [link / reference]. Figure 3 Multiple first sub-openings 1201 can be spaced out on the side of the light guide plate 12 near the light source 15; correspondingly, multiple first sub-support members 131 are also provided, and are respectively located within the corresponding first sub-openings 1201. This arrangement can effectively ensure the spacing between the light source 15 and the light guide plate 12, and improve the light coupling effect.

[0051] In some embodiments, the first sub-support 131 is a transparent support. In this case, the light emitted from the light source 15 and passing through the first sub-support 131 can be emitted towards the light guide plate 12 in roughly the original direction, thus effectively ensuring the light utilization efficiency of the light source 15.

[0052] For example, the material of the first sub-support 131 may include polymethyl methacrylate (PMMA). PMMA has a light transmittance of over 92%, which effectively reduces light loss during transmission through the first sub-support 131. Of course, the material of the first sub-support 131 may also include polycarbonate or optical-grade polystyrene, etc. This application embodiment does not impose any limitations on this.

[0053] In some embodiments, please continue reading Figure 3 The light source 15 includes a circuit board 151 and a plurality of sub-light sources 152, which are arranged at intervals along a first direction X (the length direction of the circuit board 151). The circuit board 151 is electrically connected to the plurality of sub-light sources 152 to drive the plurality of sub-light sources 152 to emit light. For example, the sub-light sources 152 can be LED beads.

[0054] The first sub-support member 131 is staggered with the multiple sub-light sources 152, meaning that the orthographic projection of the first sub-support member 131 on the circuit board 151 does not overlap with the orthographic projection of any of the sub-light sources 152 on the circuit board 151. This reduces the obstruction of light emitted by the first sub-support member 131 from the sub-light sources 152, ensuring that the light emitted by the sub-light sources 152 can enter the light guide plate 12 efficiently.

[0055] For example, the orthographic projection of the first sub-support 131 on the circuit board 151 and the orthographic projection of any sub-light source 152 on the circuit board 151 are spaced apart from each other. This can effectively prevent the light emitted from the front of the sub-light source 152 from being blocked by the first sub-support 131, and improve the efficiency of the light emitted by the sub-light source 152 entering the light guide plate 12.

[0056] In some embodiments, please continue reading Figure 3 The width of the first sub-support member 131 is greater than or equal to 0.4 mm and less than or equal to 1 mm. The width direction of the first sub-support member 131 is the same as the arrangement direction of the plurality of sub-light sources 152.

[0057] By setting the width of the first sub-support member 131 within the aforementioned range, the problem of weak support performance of the first sub-support member 131 for the middle frame 14 due to its excessively small width can be avoided. Conversely, the problem of reduced light utilization efficiency of the light source 15 due to its excessively large width can also be avoided. In other words, by setting the width of the first sub-support member 131 within the aforementioned size range, the influence of the first sub-support member 131 on the light output of the light source 15 can be effectively controlled while ensuring support strength, thus achieving a balance between support stability and optical performance.

[0058] In some examples, the width of the first sub-support 131 can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

[0059] In some embodiments, such as Figure 4 As shown, the opening 120 on the light guide plate 12 also includes a second sub-opening 1202, which is located on the side of the light guide plate 12 away from the light source 15; correspondingly, the support member 13 includes a second sub-support member 132, which is located inside the second sub-opening 1202, and the second sub-support member 132 is connected to the back plate 11 and abuts against the bottom wall of the second sub-opening 1202.

[0060] By providing a first sub-opening 1201 and a second sub-opening 1202 on opposite sides of the light guide plate 12 (the side closer to the light source 15 and the side farther from the light source 15), and by using a first sub-support 131 and a second sub-support 132 to abut against the bottom walls of the first sub-opening 1201 and the second sub-opening 1202, the movement of the light guide plate 12 can be restricted, preventing the light guide plate 12 from swaying in the direction toward or away from the light source 15. Furthermore, the second sub-support 132 can also support the portion of the middle frame 14 located on the side of the light guide plate 12 away from the light source 15, thereby effectively preventing the portion of the middle frame 14 located on the side of the light guide plate 12 away from the light source 15 from becoming suspended and falling.

[0061] In some embodiments, please refer to Figure 3 and Figure 4 The depth of the opening 120 is the same as the length of the support member 13. The depth direction of the opening 120 is consistent with the length direction of the support member 13; for example, both are parallel to the second direction Y. In this case, the surface of the light guide plate 12 on one side of the opening 120 can be flush with the end face of the support member 13, thus preventing the support member 13 from extending beyond the opening 120 and interfering with the assembly of other components in the backlight module 100.

[0062] In some embodiments, the width of the opening 120 is the same as the width of the support member 13. The width direction of the opening 120 is consistent with the width direction of the support member 13; for example, both are parallel to the first direction X. In this case, the support member 13 can restrict the movement of the light guide plate 12 along the first direction X, thereby preventing displacement of the light guide plate 12 in the first direction X. This configuration effectively prevents the light guide plate 12 from wobbling, enhancing the structural stability of the backlight module 100.

[0063] Some embodiments of this application also provide a display device, such as... Figure 2 As shown, the display device 300 includes the backlight module 100 described in any of the above embodiments.

[0064] Since it includes the backlight module 100, the display device 300 has the technical effects of the backlight module 100 described above, which will not be repeated here.

[0065] In some examples, the display device 300 also includes a display panel 200 supported on the mid-frame 14. Exemplarily, foam tape 21 may be provided between the display panel 200 and the mid-frame 14, which can effectively connect and cushion the display panel 200.

[0066] In some examples, the display device 300 further includes a first housing 22 and a second housing 23 connected to the first housing 22. The backlight module 100 and the display panel 200 are installed within the space defined by the first housing 22 and the second housing 23. The first housing 22 and the second housing 23 together can protect the backlight module 100 and the display panel 200 to mitigate the problem of damage to the backlight module 100 and the display panel 200 under external impact.

[0067] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A backlight module, characterized in that, include: Back panel; A light guide plate is located on the back plate, and an opening is provided on the side of the light guide plate; A support member passes through the opening and is supported on the back plate; as well as The middle frame is supported on the support member and is used to support the display panel.

2. The backlight module according to claim 1, characterized in that, The backlight module further includes a light source disposed on the back plate and located on one side of the light guide plate. The opening includes a first sub-opening located on the side of the light guide plate near the light source. The support includes a first sub-support located within the first sub-opening. The first sub-support is connected to the back plate and abuts against the bottom wall of the first sub-opening.

3. The backlight module according to claim 2, characterized in that, The first sub-support is a transparent support.

4. The backlight module according to claim 2, characterized in that, The light source includes a circuit board and multiple sub-light sources. The multiple sub-light sources are located on the circuit board and are spaced apart along the length of the circuit board. The first sub-support member is offset from the multiple sub-light sources.

5. The backlight module according to claim 2, characterized in that, The width of the first sub-support member is greater than or equal to 0.4 mm and less than or equal to 1 mm.

6. The backlight module according to any one of claims 2-5, characterized in that, The opening also includes a second sub-opening located on the side of the light guide plate away from the light source, and the support includes a second sub-support located within the second sub-opening, the second sub-support being connected to the back plate and abutting against the bottom wall of the second sub-opening.

7. The backlight module according to any one of claims 1-5, characterized in that, The support member has a chamfer on the side near the back plate.

8. The backlight module according to any one of claims 1-5, characterized in that, The depth of the opening is the same as the length of the support member; and / or The width of the opening is the same as the width of the support member.

9. The backlight module according to any one of claims 1-5, characterized in that, The back panel includes a base plate portion and a side plate portion that are bent and connected. The light guide plate and the support member are both supported on the base plate portion. The side plate portion and the support member are spaced apart, and the middle frame is also supported on the side plate portion.

10. A display device, characterized in that, include: The backlight module as described in any one of claims 1-9.

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