Backlight module and display device

Abstract

The utility model provides a backlight module and a display device. The backlight module comprises a back plate, a light guide plate and a light bar. The back plate is provided with a mounting hole and a containing cavity. The light guide plate is arranged in the containing cavity, the light bar is arranged in the containing cavity and extends out of the containing cavity through the installation hole, the light-emitting side of the light bar is opposite to the light-in face of the light guide plate, and the back plate is used for limiting the portion of the installation hole to be connected with the light bar in a clamped mode so as to limit the light bar to move in the thickness direction of the backlight module. According to the backlight module, the mounting hole is formed in the back plate, so that the light bar can extend to the outside of the back plate through the mounting hole when being mounted on the back plate, and the part, used for limiting the mounting hole, of the back plate is clamped with the light bar, so that the light bar is limited to move in the thickness direction of the backlight module, and the phenomenon that the light bar is damaged due to the deformation effect of a light guide plate is avoided. And a poor optical effect is caused by the deviation in the thickness direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, in particular to a backlight module and a display device. BACKGROUND

[0002] In a conventional side-in backlight module of a liquid crystal display device, a light bar and a light guide plate are generally arranged in a receiving space of a back plate, the light bar is adhered to the inner side of the back plate by using a tape, the light emitting side of the light bar is arranged opposite to the light entering surface of the light guide plate, the light emitted by the light bar enters the light guide plate, and the light is homogenized by the light guide plate to form a surface light source.

[0003] When the conventional side-in backlight module is applied in a high temperature environment, the light guide plate may be deformed due to thermal expansion, and then presses the light bar, so that the light bar is deviated in the thickness direction of the backlight module, and finally the alignment of the light bar and the light guide plate is affected, which leads to poor light emitting effect of the backlight module. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a backlight module and a display device to solve the problem that the light bar is deviated due to the pressing of the light guide plate.

[0005] The technical scheme adopted by the present application to solve the above technical problem is as follows:

[0006] In a first aspect, the embodiments of the present application provide a backlight module, comprising:

[0007] a back plate provided with a mounting hole and a receiving cavity;

[0008] a light guide plate arranged in the receiving cavity;

[0009] a light bar arranged in the receiving cavity and extending to the outside of the receiving cavity through the mounting hole, and the light emitting side of the light bar is arranged opposite to the light entering surface of the light guide plate;

[0010] wherein the profile part of the mounting hole is connected with the light bar to limit the movement of the light bar in the thickness direction of the backlight module.

[0011] Optionally, the light bar comprises a light emitting part and a connecting part, one side of the light emitting part in the thickness direction is connected with the connecting part, the light emitting part is arranged in the receiving cavity, the connecting part extends to the outside of the receiving cavity at least partially, and the connecting part is connected with at least part of the profile of the mounting hole.

[0012] Optionally, the light emitting part comprises a light plate, a stop block and a plurality of lamp beads, the plurality of lamp beads and the stop block are arranged on the light plate, and the light plate and the stop block are arranged opposite to the light guide plate, and the distance between the stop block and the light guide plate is smaller than the distance between the lamp beads and the light guide plate.

[0013] Optionally, along the length direction of the clamping portion, at least one side of the clamping portion is provided with a clamping groove, and the partial contour of the mounting hole is clamped with the clamping groove.

[0014] Optionally, the clamping groove is provided with an avoiding groove communicated with the clamping groove at the side away from the notch, and the edge of the partial contour of the mounting hole is located in the avoiding groove and is spaced from the inner wall of the avoiding groove.

[0015] Optionally, along the length direction of the clamping portion, the length of the mounting hole is not less than the minimum length of the clamping portion.

[0016] Optionally, along the length direction of the clamping portion, the length of the mounting hole is equal to the minimum length of the clamping portion.

[0017] Optionally, the clamping groove is provided at both sides of the clamping portion along the length direction, and the two clamping grooves are respectively clamped with the partial contour of the mounting hole.

[0018] Optionally, along the length direction of the clamping portion, the length of the mounting hole is greater than the maximum length of the clamping portion.

[0019] Optionally, the side of the clamping portion away from the clamping groove is spaced from the contour of the mounting hole.

[0020] Optionally, the gap between the inner wall of the clamping groove and the back plate ranges from 0 to 0.1 mm.

[0021] In a second aspect, the embodiments of the present application provide a display device comprising the backlight module of the first aspect.

[0022] In summary, due to the adoption of the above technical solutions, the present application at least includes the following beneficial effects:

[0023] The embodiments of the present application provide a backlight module and a display device. The mounting hole is provided on the back plate, so that the light bar can extend to the outside of the back plate through the mounting hole when the light bar is mounted on the back plate. The part of the back plate used to define the mounting hole is clamped with the light bar, so as to limit the movement of the light bar along the thickness direction of the backlight module, avoid the light bar from being offset in the thickness direction due to the deformation of the light guide plate, and cause adverse optical effects. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a backlight module provided by the embodiments of the present application;

[0025] Figure 2 FIG. 2 is an enlarged schematic diagram of part A in FIG. 1; Figure 1

[0026] FIG. 3 is a structural schematic diagram of another backlight module provided by the embodiments of the present application;Figure 3 Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application; Figure 2 Fig. 2 is a schematic sectional view of the backlight module according to an embodiment of the present application, wherein the section is made along a direction perpendicular to the light guide plate;

[0027] Figure 4 Fig. 3 is a schematic structural diagram of a lamp strip in the backlight module according to an embodiment of the present application; Figure 3 Fig. 4 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force; Figure 4 Fig. 5 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force; Fig. 6 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force;

[0028] Fig. 7 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force; Figure 5 Fig. 8 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force; Fig. 9 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force;

[0029] Fig. 10 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force; Figure 6 Fig. 11 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force; Fig. 12 is a schematic structural diagram of the lamp strip in the backlight module according to an embodiment of the present application, wherein the hollow arrow represents the direction of force;

[0030] Legend of reference signs:

[0031] 1, back plate; 11, mounting hole; 12, accommodating cavity; 13, bottom plate; 14, side plate; 2, light guide plate; 3, lamp strip; 31, light emitting part; 311, lamp plate; 312, lamp bead; 313, stop block; 32, clamping part; 321, clamping groove; 322, avoiding groove; 4, glue frame; 5, glue layer. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0033] In the description of the present application, it should be understood that the words “first” and “second” are only used for the purpose of description and cannot be understood as indicating or implying relative importance or indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more features. In the description of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0034] In the present application, the word “exemplary” is used to mean “serving as an example, instance, or illustration”. Any embodiment described as “exemplary” in the present application is not necessarily to be construed as preferred or advantageous over other embodiments.

[0035] Please refer to Figures 1 to 6The embodiment of the present application provides a backlight module, which comprises a backboard 1, a light guide plate 2 and a lamp strip 3. The backboard 1 is provided with a mounting hole 11 and a receiving cavity 12. The light guide plate 2 is arranged in the receiving cavity 12, and the lamp strip 3 is arranged in the receiving cavity 12 and extends out of the receiving cavity 12 through the mounting hole 11. The light emitting side of the lamp strip 3 is opposite to the light entering surface of the light guide plate 2, so that the light emitted by the lamp strip 3 can form a uniform surface light source through the light guide plate 2. The contour part of the mounting hole 11 is clamped with the lamp strip 3, so as to limit the movement of the lamp strip 3 along the thickness direction of the backlight module.

[0036] It should be noted that the backboard 1 comprises a bottom plate 13 and a side plate 14, a plurality of side plates 14 are respectively connected to the edges of the bottom plate 13, and the side plate 14 and the bottom plate 13 have a certain angle, preferably, the side plate 14 and the bottom plate 13 are perpendicular, that is, the side plate 14 and the bottom plate 13 are connected perpendicularly, so that the backboard 1 is in the form of a box without a top cover. The receiving cavity 12 is defined by the plurality of side plates 14 and the bottom plate 13. The side of the lamp strip 3 away from the light guide plate 2 can be connected and fixed with the side plate 14 by arranging a glue layer 5. The glue layer 5 has good heat conductivity and adhesion, which can ensure the fixing firmness of the lamp strip 3 and the side plate 14 to a certain extent, and can improve the heat dissipation of the lamp strip 3.

[0037] The technical scheme provided by the present application is that the mounting hole 11 is arranged on the backboard 1, so that the lamp strip 3 can extend out of the backboard 1 through the mounting hole 11 when being arranged on the backboard 1. The part of the backboard 1 for defining the mounting hole 11 is clamped with the lamp strip 3, so as to limit the movement of the lamp strip 3 along the thickness direction of the backlight module. The lamp strip 3 is prevented from being deviated in the thickness direction due to the deformation of the light guide plate 2, and the optical effect is avoided.

[0038] In some embodiments, referring to Figure 5 The lamp strip 3 comprises a light emitting part 31 and a clamping part 32. The light emitting part 31 is connected with the clamping part 32 on one side in the thickness direction, the light emitting part 31 is arranged in the receiving cavity 12, and the clamping part 32 at least partially extends out of the receiving cavity 12 and is clamped with at least part of the contour of the mounting hole 11. The length of the light emitting part 31 is much larger than that of the clamping part 32, so that the clamping part 32 can extend out of the receiving cavity 12, while the light emitting part 31 is located in the receiving cavity 12 and is limited by the backboard 1 and cannot extend out of the receiving cavity 12 together with the clamping part 32. The clamping part 32 is clamped with at least part of the contour of the mounting hole 11, so that the contour of the mounting hole 11, that is, the part of the backboard 1 clamped with the clamping part 32, limits the movement of the clamping part 32 in the thickness direction, so as to resist the shearing force of the lamp strip 3 deviated due to the extrusion of the light guide plate 2.

[0039] In some embodiments, referring to Figure 5The light emitting part 31 comprises a lamp plate 311, a stopper 313 and a plurality of lamp beads 312. The plurality of lamp beads 312 and the stopper 313 are arranged on the lamp plate 311 and are opposite to the light guide plate 2, so that the light emitted by the plurality of lamp beads 312 can be absorbed by the light guide plate 2 and then form a surface light source. The distance between the stopper 313 and the light guide plate 2 is smaller than the distance between the lamp bead 312 and the light guide plate 2, so that the stopper 313 can be closer to the light guide plate 2, but the stopper 313 and the light guide plate 2 still maintain a certain interval and are not in direct contact, which is beneficial to the control of the coupling distance. When the light guide plate 2 is deformed due to thermal expansion, the light guide plate 2 will extend towards the stopper 313, and the light guide plate 2 and the stopper 313 may abut and exert a pressing force on the stopper 313. The pressing force received by the stopper 313 will be transmitted to the light emitting part 31 and the clamping part 32, and part of the force will form a shearing force of the lamp strip 3, causing the lamp strip 3 to move in the thickness direction. However, in the present application, the back plate 1 can effectively limit the movement of the lamp strip 3 in the thickness direction, thereby avoiding the displacement of the lamp strip 3 due to the thermal expansion and deformation of the light guide plate 2.

[0040] In some embodiments, referring to Figure 5 and Figure 6 Along the length direction of the clamping part 32, at least one side of the clamping part 32 is provided with a clamping groove 321, and part of the profile of the mounting hole 11 is clamped in the clamping groove 321. By providing the clamping groove 321 on at least one side of the clamping part 32 and inserting the profile part of the mounting hole 11 into the clamping groove 321, the back plate 1 is used to limit the effective thickness direction of the clamping part 32, preventing the lamp strip 3 from moving too much in the thickness direction.

[0041] Further, the side of the clamping groove 321 away from the slot is provided with an avoiding groove 322 communicating with the clamping groove 321, and the edge of part of the profile of the mounting hole 11 is located in the avoiding groove 322 and spaced from the inner wall of the avoiding groove 322. Here, the edge refers to the two edges of the inner wall of the mounting hole 11 connected to the two side surfaces of the back plate 1 in the thickness direction. The edge is arranged in the avoiding groove 322 and spaced from the inner wall of the avoiding groove 322, rather than directly contacting the inner wall of the clamping groove 321, which is beneficial to protecting the back plate 1 and the clamping part 32 and preventing excessive damage to the clamping part 32.

[0042] In some embodiments, along the length direction of the clamping part 32, the length of the mounting hole 11 is not less than the minimum length of the clamping part 32, so as to ensure that the clamping part 32 can smoothly pass through the mounting hole 11 and the clamping part 32 can be clamped with the back plate 1.

[0043] Exemplarily, along the length direction of the clamping portion 32, the length of the mounting hole 11 is equal to the minimum length of the clamping portion 32. The minimum length of the clamping portion 32 refers to the shortest distance between the inner wall of the clamping groove 321 and the other side of the clamping portion 32, or the shortest distance between the inner wall of the clamping groove 321 on one side of the clamping portion 32 and the inner wall of the clamping groove 321 on the other side of the clamping portion 32, depending on whether the clamping grooves 321 are provided on both sides of the clamping portion 32 or only one side of the clamping portion 32. Since the length of the mounting hole 11 is equal to the minimum length of the clamping portion 32, the clamping portion 32 cannot directly pass through the mounting hole 11 vertically. During installation, the worker can tilt the clamping portion 32 to pass through the mounting hole 11, so that one side of the clamping portion 32 passes through the mounting hole 11 first, and is pre-clamped with the back plate 1, and then the other side passes through the mounting hole 11 or the clamping groove 321 on the other side is clamped with the back plate 1.

[0044] In some embodiments, along the length direction of the clamping portion 32, the length of the mounting hole 11 is greater than the maximum length of the clamping portion 32, that is, the length of the mounting hole 11 reserves enough space for the clamping portion 32 to pass through directly and vertically, facilitating the clamping and installation of the clamping portion 32 with the back plate 1. It should be noted that since the length of the mounting hole 11 is greater than the maximum length of the clamping portion 32, in this embodiment, the clamping groove 321 is only provided on one side of the clamping portion 32, because if the clamping grooves 321 are provided on both sides of the clamping portion 32, after the clamping groove 321 on one side is clamped with the back plate 1, the clamping groove 321 on the other side will have a certain spacing with the inner wall of the mounting hole 11 and cannot be clamped.

[0045] In some embodiments, the gap between the inner wall of the clamping groove 321 and the back plate 1 ranges from 0 to 0.1 mm, which can include a gap distance of 0 and 0.1 mm. If the gap is 0, it means that the back plate 1 and the clamping groove 321 are just fitted, which is beneficial to improve the clamping stability between the back plate 1 and the clamping groove 321. If the gap is not 0, such as 0.05 mm or 0.1 mm, it means that there is a certain movement allowance between the back plate 1 and the clamping groove 321, which needs to ensure that the movement of the clamping portion 32 in the movement allowance does not affect the alignment of the clamping portion 32 with the light guide plate 2. The certain movement allowance, that is, the gap fit between the back plate 1 and the clamping groove 321, facilitates the insertion of the back plate 1 into the clamping groove 321.

[0046] In some embodiments, please refer to Figure 3The backlight module further comprises a glue frame 4, which is arranged on the back plate 1 and covers the side plate 14 of the back plate 1, so that the light guide plate 2 and other optical devices are located between the glue frame 4 and the bottom plate 13 of the back plate 1, the display panel to be subsequently mounted on the backlight module is spaced from the optical devices in the back plate 1, and installation positions are also provided for the display panel. As for the specific shape and structure of the glue frame 4, since it is prior art and the improvement point of the application is not in this aspect, it will not be described here.

[0047] The embodiment of the application further provides a display device comprising a display panel and the backlight module as described in any one of the preceding embodiments, wherein the display panel is arranged on the backlight module, and the backlight module is used for providing a backlight source for the display panel. As for the structure and beneficial effects of the display device related to the backlight module, please refer to the description of the preceding embodiments related to the backlight module, which will not be described here.

[0048] Meanwhile, specific words are used in the application to describe the embodiments of the application. For example, "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that the "one embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different positions in the specification does not necessarily mean the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the application can be properly combined.

[0049] Similarly, it should be noted that, in order to simplify the description of the disclosure of the application and to help understand one or more embodiments of the application, sometimes multiple features are combined into one embodiment, figure or description thereof in the foregoing description of the embodiments of the application. However, this disclosure method does not mean that the features required by the application are more than the features mentioned in the claims. In fact, the features of the embodiment are less than all the features of the disclosed single embodiment.

Claims

1. A backlight module, characterized in that, The backlight module comprises: a backboard provided with a mounting hole and a receiving cavity; a light guide plate arranged in the receiving cavity; a light bar arranged in the receiving cavity and extending out of the receiving cavity through the mounting hole, the light exit side of the light bar being opposite to the light entrance surface of the light guide plate; wherein the profile part of the mounting hole is clamped with the light bar to limit the movement of the light bar along the thickness direction of the backlight module.

2. The backlight module of claim 1, wherein, The light bar comprises a light exit part and a clamping part, one side of the light exit part in the thickness direction being connected with the clamping part, the light exit part being arranged in the receiving cavity, and the clamping part extending at least partially out of the receiving cavity, the clamping part being clamped with at least part of the profile of the mounting hole.

3. The backlight module of claim 2, wherein, The light exit part comprises a lamp plate, a stop block and a plurality of lamp beads, the plurality of lamp beads and the stop block being arranged on the lamp plate and being arranged opposite to the light guide plate, the distance between the stop block and the light guide plate being smaller than the distance between the lamp beads and the light guide plate.

4. The backlight module of claim 2, wherein, Along the length direction of the clamping part, at least one side of the clamping part is provided with a clamping groove, and part of the profile of the mounting hole is clamped with the clamping groove.

5. The backlight module of claim 4, wherein, The side of the clamping groove away from the groove opening is provided with an avoiding groove in communication with the clamping groove, and the edge of part of the profile of the mounting hole is located in the avoiding groove and is spaced apart from the inner wall of the avoiding groove.

6. The backlight module of claim 4, wherein, Along the length direction of the clamping part, the length of the mounting hole is not less than the minimum length of the clamping part.

7. The backlight module of claim 6, wherein, Along the length direction of the clamping part, the length of the mounting hole is equal to the minimum length of the clamping part.

8. The backlight module of claim 7, wherein, The clamping grooves are arranged on both sides of the clamping part along the length direction, and the two clamping grooves are respectively clamped with part of the profile of the mounting hole.

9. The backlight module of claim 6, wherein, Along the length direction of the clamping part, the length of the mounting hole is greater than the maximum length of the clamping part.

10. The backlight module of claim 9, wherein, The side of the clamping part away from the clamping groove is spaced apart from the profile of the mounting hole.

11. The backlight module of any one of claims 4 to 10, wherein, The gap between the inner wall of the clamping groove and the backboard ranges from 0 to 0.1 mm.

12. A display device, characterized by comprising: The backlight module comprises the backlight module according to any one of claims 1 to 11.

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