Backlight module and display device

Abstract

This application relates to the field of display technology, and proposes a backlight module and display device. The backlight module includes a backplate, a light strip assembly, and a printed circuit board. The backplate includes a base plate, side plates, and a fixing plate. The base plate and side plates form a cavity. The fixing plate is connected to the side plates. The light strip assembly is disposed on the base plate and located within the cavity. The printed circuit board is fixed on the fixing plate and includes a cover plate segment. The cover plate segment is arranged correspondingly to the light strip assembly and covers the light strip assembly. When installing the light strip assembly, the light strip assembly can be installed on the base plate of the backplate first, and then the printed circuit board can be fixed on the fixing plate, with the cover plate segment of the printed circuit board covering the light strip assembly. When disassembling the light strip assembly, the printed circuit board can be removed from the fixing plate first, and the cover plate segment no longer covers the light strip assembly. Then, the light strip assembly can be removed from the base plate of the backplate. Therefore, the installation and removal of the light strip assembly is relatively convenient, solving the problem of inconvenient installation and removal of the light strip assembly.

Description

Technical Field

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

[0002] Display devices typically include a backlight module and a display panel, with the backlight module providing a light source for the display panel; the LED strip assembly is an important component of the backlight module. In related technologies, the LED strip assembly is inconvenient to assemble and disassemble. Utility Model Content

[0003] In view of this, embodiments of this application provide a backlight module and a display device to solve the problem of inconvenient disassembly and assembly of the light strip assembly.

[0004] An embodiment of the first aspect of this application provides a backlight module, including a backplate, a light strip assembly, and a printed circuit board. The backplate includes a base plate, a side plate, and a fixing plate. The base plate and the side plate form a cavity. The fixing plate is connected to the side plate. The light strip assembly is connected to the base plate and is located within the cavity. The printed circuit board is fixed on the fixing plate. The printed circuit board includes a cover plate segment. The cover plate segment is arranged correspondingly to the light strip assembly and covers the light strip assembly.

[0005] The beneficial effects of the backlight module provided in this application embodiment are as follows: When installing the LED strip assembly, the LED strip assembly can be first installed on the bottom plate of the back panel, and then the printed circuit board can be fixed on the fixing plate, with the cover plate segment of the printed circuit board covering the LED strip assembly; when disassembling the LED strip assembly, the printed circuit board can be first removed from the fixing plate, the cover plate segment no longer covers the LED strip assembly, and then the LED strip assembly can be removed from the bottom plate of the back panel. Therefore, the installation and removal of the LED strip assembly is relatively convenient, solving the problem of inconvenient installation and removal of the LED strip assembly. Moreover, by using the cover plate segment of the printed circuit board fixed on the fixing plate as a lampshade to cover the LED strip assembly, there is no need for the side plate of the back panel to be bent inward to form a lampshade, thereby simplifying the processing of the back panel.

[0006] In some embodiments, the cover plate segment has a reflective layer on the side facing the light strip assembly.

[0007] The beneficial effects of adopting the above technical solution are: the reflective layer can redirect the light leaking out from the periphery of the light guide plate back to the light guide plate, thereby reducing light loss and improving backlight brightness.

[0008] In some embodiments, the reflective layer is a reflective coating.

[0009] The advantages of adopting the above technical solution are: forming a reflective layer by brushing is simple, convenient, and can reduce costs.

[0010] In some embodiments, a positioning structure is provided between the side plate and the printed circuit board.

[0011] The beneficial effects of adopting the above technical solution are: it can ensure the relative position of the printed circuit board and the back plate, prevent the printed circuit board from moving relative to the back plate, and thus ensure the light-shielding effect.

[0012] In some embodiments, the positioning structure includes a positioning protrusion and a positioning groove, the positioning protrusion being disposed on one of the side plate and the printed circuit board, and the positioning groove being disposed on the other of the side plate and the printed circuit board.

[0013] In some embodiments, the positioning protrusion is a strip-shaped protrusion extending along the length direction of the side plate, and the positioning groove is a strip-shaped groove extending along the length direction of the side plate.

[0014] The beneficial effects of adopting the above technical solution are: the insertion of the strip-shaped protrusions and the strip-shaped grooves makes it easier to position the printed circuit board.

[0015] In some embodiments, the fixing plate has a threaded hole, the printed circuit board has a through hole, and the backlight module further includes a threaded fastener, which passes through the through hole and is screwed into the threaded hole to fix the printed circuit board on the fixing plate.

[0016] The beneficial effects of adopting the above technical solution are: fixing the printed circuit board to the fixing plate with threaded fasteners improves the stability of the printed circuit board after fixing, and facilitates the disassembly and assembly of the printed circuit board.

[0017] In some embodiments, the printed circuit board is bonded and fixed to the fixing plate.

[0018] The advantages of adopting the above technical solution are: no need to drill holes in the printed circuit board and the fixing plate, simplifying the processing steps of the printed circuit board and the fixing plate.

[0019] In some embodiments, the light strip assembly includes a flexible circuit board and a plurality of light strips, the flexible circuit board being connected to the base plate and the plurality of light strips being disposed on the flexible circuit board.

[0020] A second aspect of this application provides a display device comprising a backlight module as described in the first aspect.

[0021] The display device employs all the embodiments of the aforementioned backlight module, and therefore possesses at least all the beneficial effects of the aforementioned embodiments, which will not be elaborated upon here.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the 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.

[0024] Figure 1 This is a partial structural diagram of a display device in the prior art; Figure 2 yes Figure 1 A partial structural diagram of the backlight module is shown; Figure 3 This is a partial structural schematic diagram of a display device provided in some embodiments of this application; Figure 4 yes Figure 3 A partial structural diagram of the backlight module is shown; Figure 5 This is a partial structural schematic diagram of the backplane and printed circuit board provided in some embodiments of this application.

[0025] The markings in the diagram mean: 100. Display device; 110. Backlight module; 111. Back plate; 1111. Base plate; 1112. Side plate; 11121. Positioning protrusion; 1113. Fixing piece; 11131. Threaded hole; 1114. Cavity; 112. LED strip assembly; 1121. Flexible circuit board; 1122. LED strip; 113. Printed circuit board; 1131. Cover plate segment; 1132. Positioning groove; 1133. Perforation; 11311. Reflective layer; 114. Threaded fastener; 115. Light guide plate; 120. Display panel; 200. Display device; 210. Backlight module; 211. Back plate; 2111. Base plate; 2112. Side plate; 2113. Lampshade; 2114. Fixing plate; 212. LED strip assembly; 2121. Flexible circuit board; 2122. LED strip; 213. Printed circuit board; 220. Display panel. Detailed Implementation

[0026] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0034] An existing display device such as Figure 1 and Figure 2 As shown, the display device 200 includes a backlight module 210 and a display panel 220. The backlight module 210 includes a back plate 211, a light strip assembly 212, and a printed circuit board 213. The back plate 211 includes a base plate 2111 and a side plate 2112. The side plate 2112 has a lampshade 2113 bent inward and a fixing piece 2114 bent outward. The printed circuit board 213 is fixed on the fixing piece 2114. The light strip assembly 212 includes a flexible circuit board 2121 and multiple light strips 2122 disposed on the flexible circuit board 2121. The light strip assembly 212 is located within the space enclosed by the base plate 2111, the side plate 2112, and the lampshade 2113. However, because the space enclosed by the base plate 2111, the side plate 2112, and the lampshade 2113 is relatively small, the light strip assembly 212 is inconvenient to assemble and disassemble.

[0035] To address the problem of inconvenient assembly and disassembly of LED strip components, this application proposes a backlight module and a display device.

[0036] This backlight module utilizes a portion of the printed circuit board as a lampshade. When the LED strip assembly needs to be disassembled, the printed circuit board can be removed from the mounting plate. Therefore, the disassembly and assembly of the LED strip assembly is relatively convenient, solving the problem of inconvenient disassembly and assembly. The aforementioned display device, including this backlight module, can improve the assembly efficiency of the display device, thereby increasing the production efficiency of the display device.

[0037] An embodiment of the first aspect of this application provides a backlight module for use in a display device, such as an LCD display. Please refer to... Figure 3 and Figure 4The backlight module 110 includes a back plate 111, a light strip assembly 112, and a printed circuit board 113. The back plate 111 includes a base plate 1111, a side plate 1112, and a fixing piece 1113. The base plate 1111 and the side plate 1112 form a cavity 1114. The fixing piece 1113 is connected to the side plate 1112. The light strip assembly 112 is connected to the base plate 1111 and is located in the cavity 1114. The printed circuit board 113 is fixed on the fixing piece 1113. The printed circuit board 113 includes a cover plate segment 1131. The cover plate segment 1131 is arranged correspondingly to the light strip assembly 112 and covers the light strip assembly 112.

[0038] The function of the backlight module 110 is to provide a light source for the display panel 120. The backlight module 110 is an edge-lit backlight module.

[0039] The side plate 1112 is located at the edge of the base plate 1111, and the side plate 1112 is perpendicular to or nearly perpendicular to the base plate 1111. Understandably, the base plate 1111 is parallel to or nearly parallel to the display panel 120, the side plate 1112 is perpendicular to or nearly perpendicular to the display panel 120, and the opening of the cavity 1114 formed by the base plate 1111 and the side plate 1112 faces the display panel 120.

[0040] The fixing piece 1113 is connected to the side plate 1112. It can be understood that the fixing piece 1113 can be integrally connected to the side plate 1112, for example, the fixing piece 1113 is bent and formed on the side plate 1112; or, the fixing piece 1113 can be fixedly connected to the side plate 1112, for example, the fixing piece 1113 is fixedly connected to the side plate 1112 by welding, fastener connection or other means.

[0041] The fixing piece 1113 is located on the outer side of the side plate 1112. It is understood that one fixing piece 1113 may be provided; alternatively, multiple fixing pieces 1113 may be provided, for example, two fixing pieces 1113 may be provided. When multiple fixing pieces 1113 are provided, they are arranged at intervals along the length of the side plate 1112.

[0042] The method by which the light strip assembly 112 is connected to the base plate 1111 is not limited in this application. For example, the light strip assembly 112 may be glued to the base plate 1111.

[0043] The LED strip assembly 112 is located inside the cavity 1114, which can be understood as the LED strip assembly 112 being located inside the side plate 1112.

[0044] The method by which the printed circuit board 113 is fixed on the fixing plate 1113 is not limited in this application. For example, the printed circuit board 113 can be fixed on the fixing plate 1113 by means of bonding, fastener connection, crimping, etc.

[0045] The cover plate segment 1131 is arranged correspondingly to and covers the light strip assembly 112, that is, the cover plate segment 1131 acts as a lampshade. It can be understood that the cover plate segment 1131 is located inside the side plate 1112.

[0046] For example, a light guide plate 115 is also provided within the cavity 1114. The light guide plate 115 is located between the base plate 1111 and the display panel 120. Understandably, the light guide plate 115 is parallel to or nearly parallel to the base plate 1111. The light guide plate 115 can convert the point light source or line light source provided by the lamp strip assembly 112 into a surface light source to achieve a uniform light emission effect, thereby improving the brightness uniformity of the display panel 120.

[0047] The beneficial effects of the backlight module 110 provided in this application embodiment are as follows: When installing the LED strip assembly 112, the LED strip assembly 112 can be first installed on the bottom plate 1111 of the back plate 111, and then the printed circuit board 113 can be fixed on the fixing plate 1113, with the cover plate segment 1131 of the printed circuit board 113 covering the LED strip assembly 112; when disassembling the LED strip assembly 112, the printed circuit board 113 can be first removed from the fixing plate 1113, and the cover plate segment 1131 no longer covers the LED strip assembly 112, and then the LED strip assembly 112 can be removed from the bottom plate 1111 of the back plate 111. Therefore, the LED strip assembly 112 is easier to install and remove, solving the problem of inconvenient installation and removal of the LED strip assembly 112. Furthermore, by using the cover plate segment 1131 of the printed circuit board 113 fixed on the fixing plate 1113 as a lampshade to cover the light strip assembly 112, the side plate 1112 of the back plate 111 does not need to be bent inward to form a lampshade, thereby simplifying the processing of the back plate 111.

[0048] Please refer to Figure 4 In some embodiments, the cover plate segment 1131 has a reflective layer 11311 on the side facing the light strip assembly 112.

[0049] The reflective layer 11311 can redirect light leaking from the periphery of the light guide plate 115 back to the light guide plate 115 to reduce light loss and thus improve backlight brightness.

[0050] In some embodiments, the reflective layer 11311 is a reflective coating.

[0051] Understandably, the reflective coating is formed by brushing the cover plate segment 1131 onto the side facing the light strip assembly 112.

[0052] For example, the reflective coating may be white paint applied to the side of the cover plate segment 1131 facing the light strip assembly 112.

[0053] Based on the above technical solution, the reflective layer 11311 is formed by brushing, which is simple, convenient and can reduce costs.

[0054] In some other embodiments, the reflective layer 11311 may be a reflective film, which may be adhered to the side of the cover plate segment 1131 facing the light strip assembly 112.

[0055] In some embodiments, a positioning structure is provided between the side plate 1112 and the printed circuit board 113, so as to ensure the relative position of the printed circuit board 113 and the back plate 111, prevent the printed circuit board 113 from moving relative to the back plate 111, and thus ensure the light-shielding effect.

[0056] Please refer to Figure 4 and Figure 5 The positioning structure includes a positioning protrusion 11121 and a positioning groove 1132. The positioning protrusion 11121 is located on the side plate 1112, and the positioning groove 1132 is located on the printed circuit board 113.

[0057] Understandably, when the printed circuit board 113 is fixed on the fixing plate 1113, the positioning protrusion 11121 and the positioning groove 1132 are inserted and engaged to position the printed circuit board 113.

[0058] The length direction of the printed circuit board 113 is the X direction, and the width direction of the printed circuit board 113 is the Y direction. The length direction of the side plate 1112 is the same as the length direction of the printed circuit board 113, that is, the length direction of the side plate 1112 is the X direction.

[0059] Understandably, one positioning protrusion 11121 and one positioning groove 1132 can be provided; or, multiple positioning protrusions 11121 and multiple positioning grooves 1132 can be provided. For example, two positioning protrusions 11121 are provided at intervals along the length direction of the side plate 1112, and correspondingly, two positioning grooves 1132 are provided at intervals along the length direction of the printed circuit board 113.

[0060] In some other embodiments, the positioning protrusion 11121 may be provided on the printed circuit board 113, and the positioning groove 1132 may be provided on the side plate 1112; or, when multiple positioning protrusions 11121 and positioning grooves 1132 are provided, some positioning protrusions 11121 and some positioning grooves 1132 are provided on the printed circuit board 113, and other positioning protrusions 11121 and other positioning grooves 1132 are provided on the side plate 1112.

[0061] Please refer to Figure 5 In some embodiments, the positioning protrusion 11121 is a strip-shaped protrusion extending along the length direction of the side plate 1112, and the positioning groove 1132 is a strip-shaped groove extending along the length direction of the side plate 1112.

[0062] Based on the above technical solution, the insertion of the strip-shaped protrusions and the strip-shaped grooves makes it easier to position the printed circuit board 113.

[0063] In some other embodiments, the positioning protrusion 11121 can be a circular protrusion, and the positioning groove 1132 can be a circular groove.

[0064] Please refer to Figure 5 In some embodiments, the fixing plate 1113 is provided with a threaded hole 11131, the printed circuit board 113 is provided with a through hole 1133, and the backlight module 110 further includes a threaded fastener 114, which passes through the through hole 1133 and is screwed into the threaded hole 11131 to fix the printed circuit board 113 on the fixing plate 1113.

[0065] Understandably, the threaded fastener 114 can be a screw, bolt, etc.

[0066] Based on the above technical solution, the printed circuit board 113 is fixed on the fixing plate 1113 by the threaded fastener 114, which improves the stability of the printed circuit board 113 after it is fixed, and at the same time facilitates the disassembly and assembly of the printed circuit board 113.

[0067] In some embodiments, the printed circuit board 113 is bonded and fixed to the fixing plate 1113.

[0068] Understandably, the printed circuit board 113 can be fixed to the fixing plate 1113 by double-sided adhesive; or, the printed circuit board 113 can also be fixed to the fixing plate 1113 by glue.

[0069] Based on the above technical solution, there is no need to drill holes in the printed circuit board 113 and the fixing piece 1113, which simplifies the processing steps of the printed circuit board 113 and the fixing piece 1113.

[0070] Please refer to Figure 4 In some embodiments, the light strip assembly 112 includes a flexible circuit board 1121 and a plurality of light strips 1122. The flexible circuit board 1121 is connected to the base plate 1111, and the plurality of light strips 1122 are disposed on the flexible circuit board 1121.

[0071] For example, the flexible circuit board 1121 is bonded to the base plate 1111. The flexible circuit board 1121 passes through the side plate 1112 and is connected to the printed circuit board 113.

[0072] The light strip 1122 extends along the length of the printed circuit board 113, and multiple light strips 1122 are arranged at intervals along the length of the printed circuit board 113.

[0073] Understandably, in the Y direction, the light strip 1122 is located between the light guide plate 115 and the side plate 1112.

[0074] For example, the light strip 1122 is an LED light.

[0075] It should be noted that the flexible printed circuit board 1121 (Flexible Printed Circuit, FPC) is a flexible board that can be folded and bent at will; the printed circuit board 113 (Printed Circuit Board, PCB) is a rigid board that is not easily bent or deformed and can provide stable support for electronic components.

[0076] In other embodiments, the light strip 1122 may also be replaced by a round LED.

[0077] Please refer to Figure 3 The second aspect of this application provides a display device 100, which includes a display panel 120 and a backlight module 110 as described in the first aspect, the backlight module 110 providing a light source for the display panel 120.

[0078] The display device 100 can be a television, computer, mobile phone, etc.

[0079] The display device 100 employs all embodiments of the backlight module 110 described above, and therefore has at least all the beneficial effects of the above embodiments, which will not be elaborated here.

[0080] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A backlight module, characterized in that: The device includes a back panel, a light strip assembly, and a printed circuit board. The back panel includes a base plate, a side plate, and a fixing plate. The base plate and the side plate form a cavity. The fixing plate is connected to the side plate. The light strip assembly is connected to the base plate and is located within the cavity. The printed circuit board is fixed on the fixing plate. The printed circuit board includes a cover plate segment. The cover plate segment is arranged correspondingly to the light strip assembly and covers the light strip assembly.

2. The backlight module as described in claim 1, characterized in that: The cover plate segment has a reflective layer on the side facing the light strip assembly.

3. The backlight module as described in claim 2, characterized in that: The reflective layer is a reflective coating.

4. The backlight module as described in claim 1, characterized in that: A positioning structure is provided between the side plate and the printed circuit board.

5. The backlight module as described in claim 4, characterized in that: The positioning structure includes a positioning protrusion and a positioning groove. The positioning protrusion is disposed on one of the side plate and the printed circuit board, and the positioning groove is disposed on the other of the side plate and the printed circuit board.

6. The backlight module as described in claim 5, characterized in that: The positioning protrusion is a strip-shaped protrusion extending along the length direction of the side plate, and the positioning groove is a strip-shaped groove extending along the length direction of the side plate.

7. The backlight module as described in any one of claims 1-6, characterized in that: The fixing plate has a threaded hole, the printed circuit board has a through hole, and the backlight module also includes a threaded fastener, which passes through the through hole and is screwed into the threaded hole to fix the printed circuit board on the fixing plate.

8. The backlight module as described in any one of claims 1-6, characterized in that: The printed circuit board is bonded and fixed to the fixing plate.

9. The backlight module as described in any one of claims 1-6, characterized in that: The light strip assembly includes a flexible circuit board and multiple light strips. The flexible circuit board is connected to the base plate, and the multiple light strips are disposed on the flexible circuit board.

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

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