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 and a rubber frame, a containing cavity is formed in the back plate, and a first inclined face is arranged on the cavity wall of the containing cavity; the light guide plate is arranged in the accommodating cavity, a second inclined surface corresponding to the first inclined surface is arranged on the light guide plate, and the first inclined surface is attached to the second inclined surface; the rubber frame is buckled on the back plate, an elastic piece is arranged on the inner top wall of the rubber frame, and the elastic piece abuts against the top face of the light guide plate. According to the backlight module, the first inclined face and the second inclined face which correspond to each other and can be attached to each other are arranged on the back plate and the light guide plate respectively, when the light guide plate expands with heat and contracts with cold, the light guide plate can move in the extending direction of the first inclined face and is attached to the back plate all the time in the moving process, and the elastic piece arranged on the rubber frame abuts against the top face of the light guide plate all the time. Therefore, the phenomenon of abnormal sound caused by gaps between the light guide plate and other structures in the backlight module due to expansion caused by heat and contraction caused by cold is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field, concretely relates to a backlight module and display device. BACKGROUND

[0002] Liquid crystal display device has many advantages such as thin body, power saving and no radiation, has been widely applied.The liquid crystal display device on the market mostly is backlit liquid crystal display device, and it includes liquid crystal panel and backlight module.The working principle of liquid crystal panel is that liquid crystal molecules are placed between two parallel glass substrates, and there are many vertical and horizontal fine wires in the middle of the two glass substrates, and the liquid crystal molecules change direction by power on and off to refract the light of backlight module to produce picture.Because liquid crystal panel does not emit light, it needs the light source provided by backlight module to normally display image, therefore, backlight module is one of the key structures of liquid crystal display device.

[0003] As shown in Figure 1 The backlight module in the prior art usually includes back plate 100', light source 200', light guide plate 300', optical film piece 400' and reflecting film 500'. The light emitted by light source 200' enters the inside of light guide plate 300' from the light entry side 301' of light guide plate 300', and the light is emitted from the light exit side 302' of light guide plate 300' through total reflection and scattering principle. Wherein, the role of reflecting film 500' is to make light guide plate 300' reflect the light emitted from light source 200' to make it pass through liquid crystal panel better; the role of optical film piece 400' is to recycle, diffuse, brighten and homogenize the light emitted from the light exit side 302' of light guide plate 300', thereby improving the display effect of the whole display device. In the use process of the backlight module, light guide plate 300' will be affected by the heat emitted from light source 200' when working, thereby generating the phenomenon of thermal expansion and cold contraction. For this reason, the backlight module in the prior art usually leaves a gap between light guide plate 300' and back plate 100' for the deformation of light guide plate 300', but this design makes the backlight module prone to abnormal sound when used, affecting the user experience.

[0004] Therefore, there is an urgent need for a backlight module to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a backlight module and display device, avoid the abnormal sound phenomenon caused by the thermal expansion and cold contraction of light guide plate, and improve the user experience.

[0006] In order to realize the above target, the utility model adopts the following technical scheme:

[0007] A backlight module, comprising:

[0008] A backboard is internally provided with a containing cavity, and a first inclined surface is arranged on a cavity wall of the containing cavity;

[0009] A light guide plate is arranged in the containing cavity, and a second inclined surface is arranged on the light guide plate corresponding to the first inclined surface, and the first inclined surface and the second inclined surface are attached to each other;

[0010] A glue frame is buckled on the backboard, and an elastic member is arranged on an inner top wall of the glue frame and is pressed against a top surface of the light guide plate.

[0011] Preferably, the backboard comprises a bottom plate and a plurality of side plates vertically arranged on the bottom plate, the plurality of side plates are sequentially connected in a head-to-tail manner, and the bottom plate and the plurality of side plates surround to form the containing cavity;

[0012] One of the side plates is provided with a light source assembly, and the other two side plates adjacent to the side plate provided with the light source assembly are both provided with the first inclined surface, and each of the first inclined surfaces corresponds to one of the second inclined surfaces.

[0013] Preferably, the other side plates opposite to the side plate provided with the light source assembly are provided with the first inclined surface.

[0014] Preferably, at least part of an end of the side plate away from the bottom plate is bent into the containing cavity to form a bending part, and a surface of the bending part towards the center of the containing cavity forms the first inclined surface.

[0015] Preferably, the first inclined surface is provided with a heat dissipation structure.

[0016] Preferably, the backlight module further comprises a right-angle triangular prism-shaped fitting part, the fitting part comprises a first surface, a second surface and a third surface sequentially connected in a head-to-tail manner, the first surface and the second surface are perpendicular to each other, the first surface and the second surface are respectively connected to a cavity wall and a cavity bottom of the containing cavity, and the third surface forms the first inclined surface.

[0017] Preferably, the elastic member comprises a connecting part and a pressing part arranged at an included angle and connected to each other, one end of the connecting part away from the pressing part is connected to the glue frame, and a pressing surface of the pressing part is pressed against the top surface of the light guide plate.

[0018] Preferably, the elastic member is integrally formed on the glue frame.

[0019] Preferably, the elastic member is a spring or a rubber block.

[0020] The utility model also provides a display device, including display panel and backlight module as described above, the backlight module is used for supporting the display panel, and can provide the backlight source for the display panel.

[0021] The backlight module has the advantages that:

[0022] The backlight module has the advantages that:

[0023] The display device has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the contents of the embodiments of the present application and the drawings without any creative effort.

[0025] Figure 1 is a partial cross-sectional view of the backlight module provided by the prior art;

[0026] Figure 2 is a structural schematic view of the backlight module provided by the embodiment one of the present application;

[0027] Figure 3 is a cross-sectional structural schematic view of the backlight module provided by the embodiment one of the present application;

[0028] Figure 4 is a structural schematic view of the backboard provided by the embodiment one of the present application;

[0029] Figure 5 is Figure 4 is an enlarged view of a part at A;

[0030] Figure 6 is Figure 4 is an enlarged view of a part at B;

[0031] Figure 7 is a structural schematic view of the light guide plate provided by the embodiment one of the present application;

[0032] Figure 8 is a structural schematic view of the glue frame under one viewing angle provided by the embodiment one of the present application;

[0033] Figure 9 is Figure 8 is a partial enlarged view at C;

[0034] Figure 10 is a partial structural schematic view of the glue frame under another viewing angle provided by the embodiment one of the present application;

[0035] Figure 11 is a structural schematic view of the back plate and the adhering piece provided by the embodiment two of the present application;

[0036] Figure 12 is a structural schematic view of the adhering piece provided by the embodiment two of the present application.

[0037] Reference signs:

[0038] 100', back plate; 110', bottom plate; 120', side plate; 200', light source; 300', light guide plate; 301', light-in side; 302', light-out side; 400', optical film; 500', reflecting film;

[0039] 100, back plate; 1001, accommodating cavity; 1002, first inclined surface; 110, bottom plate; 120, side plate; 121, bending part; 1201, first side plate; 1202, second side plate; 1203, third side plate; 1204, fourth side plate;

[0040] 200, light guide plate; 201, second inclined surface;

[0041] 300, glue frame; 310, elastic piece; 311, connecting part; 312, pressing part; 3121, pressing surface;

[0042] 400, adhering piece; 401, first surface; 402, second surface. DETAILED DESCRIPTION

[0043] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0044] In the present application, the terms "comprise", "contain", "include" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0045] In the present application, the term "and / or" is a description of an associated relationship between associated objects, which means that there can be three kinds of relationships. For example, A and / or B can mean that there are three cases: A exists alone, A and B exist together, and B exists alone. In addition, in the present application, the character " / " generally represents a "and / or" relationship between the front and rear associated objects.

[0046] In the present application, the terms "connection", "combination", "coupling" and "installation" can be direct connection, combination, coupling or installation, or indirect connection, combination, coupling or installation. Among them, direct connection means that two parts or components are connected together without setting intermediate parts, indirect connection means that two parts or components are connected with at least one intermediate part, and the two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0047] In the present application, those skilled in the art will understand that the relative terms used in connection with the number or condition (for example, "about", "approximately", "substantially" and the like) include the values indicated by the context. For example, the relative terms at least include the error degree related to the measurement of the specific value, the tolerance caused by manufacturing, assembly, use and the like related to the specific value. Such terms should also be regarded as disclosing the range defined by the absolute values of the two endpoints. The relative term can refer to the addition or subtraction of a certain percentage (for example, 1%, 5%, 10% or more) of the indicated value. The numerical value without the relative term should also be disclosed as a specific value with tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to the addition or subtraction of a certain degree (for example, 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0048] In the present application, those skilled in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0049] In the utility model, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the utility model. In addition, it should also be understood in the context that when referring to one element being connected to another element "on" or "under", it can be directly connected to another element "on" or "under", or indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, left below, right below, front below and back below and the like.

[0050] Embodiment one

[0051] Figure 2 The structure schematic diagram of the backlight module provided by the embodiment is shown, Figure 3 The cross-sectional structure schematic diagram of the backlight module provided by the embodiment is shown, Figures 2-3 The backlight module provided by the embodiment includes a back plate 100, a light guide plate 200 and a rubber frame 300. The back plate 100 is provided with a containing cavity 1001. The cavity wall of the containing cavity 1001 is provided with a first inclined surface 1002. The light guide plate 200 is arranged in the containing cavity 1001. The light guide plate 200 is provided with a second inclined surface 201 corresponding to the first inclined surface 1002. The first inclined surface 1002 and the second inclined surface 201 are attached. The rubber frame 300 is buckled on the back plate 100. The inner top wall of the rubber frame 300 is provided with an elastic element 310. The elastic element 310 is pressed against the top surface of the light guide plate 200.

[0052] It should be noted that the terms "upper", "lower", "top", "bottom" and the like mentioned in the embodiment are not the "upper", "lower" in the spatial sense when the backlight module is actually used, but are only used for referring to the view direction of the drawings to distinguish different features, and cannot be used as a limitation on the technical solution of the embodiment. Figure 3

[0053] ​The backlight module provided by the embodiment can avoid deformation of the light guide plate 200 when the light guide plate 200 expands by converting the expansion amount of the light guide plate 200 in the horizontal direction into displacement in the vertical direction when the light guide plate 200 expands and contracts due to heat. During the movement of the light guide plate 200 relative to the first inclined surface 1002, on one hand, the light guide plate 200 and the back plate 100 always remain in close contact through the matched first inclined surface 1002 and the second inclined surface 201, and on the other hand, the elastic member 310 arranged on the glue frame 300 can be elastically deformed to always press against the top surface of the light guide plate 200, thereby ensuring the stability of the light guide plate 200 during use to prevent the light guide plate 200 from expanding and contracting due to heat, which can cause a gap between the light guide plate 200 and other structures in the backlight module, thereby causing an abnormal sound.

[0054] Figure 4 A structural schematic diagram of the back plate 100 provided by the embodiment is shown, Figure 5 A structural schematic diagram of the back plate 100 provided by the embodiment is shown, Figure 4 A partial enlarged view at A, Figure 6 A structural schematic diagram of the light guide plate 200 provided by the embodiment is shown, Figure 4 A partial enlarged view at B, Figure 7 A structural schematic diagram of the light guide plate 200 provided by the embodiment is shown, Figures 4-7 A structural schematic diagram of the light guide plate 200 provided by the embodiment is shown, Figure 3 As shown in the drawings, the back plate 100 includes a bottom plate 110 and a plurality of side plates 120 arranged upright on the bottom plate 110. The plurality of side plates 120 are sequentially connected at the head and tail and surround the bottom plate 110 to form a containing cavity 1001. One of the side plates 120 is provided with a light source assembly (not shown in the drawings), and the other two side plates 120 adjacent to the side plate 120 provided with the light source assembly are both provided with a first inclined surface 1002, and each first inclined surface 1002 corresponds to a second inclined surface 201.

[0055] Specifically, in the embodiment, the number of the side plates 120 is four, and the four side plates 120 are sequentially connected at the head and tail as a first side plate 1201, a second side plate 1202, a third side plate 1203 and a fourth side plate 1204. The first side plate 1201 is provided with the light source assembly, and the second side plate 1202 and the fourth side plate 1204 adjacent to the first side plate 1201 are both provided with the first inclined surface 1002, and the light guide plate 200 is provided with the second inclined surface 201 corresponding to each first inclined surface 1002, which can ensure the stability of the light guide plate 200 during the up-and-down movement relative to the back plate 100 when the light guide plate 200 expands and contracts due to heat, thereby avoiding tilting of the light guide plate 200 during the movement and affecting the reflection effect of the light guide plate 200 on the light, and thus ensuring the display effect of the display device using the backlight module.

[0056] Of course, in other embodiments, the first inclined surface 1002 can also be arranged on the side plate 120 opposite to the side plate 120 on which the light source assembly is arranged (i.e. the third side plate 1203), so as to further ensure the stability of the light guide plate 200 in the up-and-down movement relative to the back plate 100 when the light guide plate 200 expands or shrinks due to temperature change.

[0057] As shown in Figures 5-6 , at least part of the side plate 120 away from the bottom plate 110 is bent inwardly to form a bent portion 121 in the accommodating cavity 1001, and the surface of the bent portion 121 facing the center of the accommodating cavity 1001 forms the first inclined surface 1002. That is, the bent portion 121 is integrally formed on the back plate 100, which can simplify the processing process, omit the process of connecting the bent portion 121 with the back plate 100, improve the processing efficiency, and reduce the processing cost.

[0058] In the present embodiment, at least two bent portions 121 are arranged on each side plate 120 provided with the first inclined surface 1002, and the at least two bent portions 121 are arranged in a length direction of the corresponding side plate 120, so as to ensure the stable up-and-down movement of the light guide plate 200 relative to the back plate 100 when the light guide plate 200 expands or shrinks due to temperature change, save materials, and thus reduce the processing cost; and the part between the adjacent two bent portions 121 can also be used to form a stable connection with the glue frame 300, so as to ensure the structural stability of the entire backlight module. Of course, in other embodiments, one bent portion 121 can also be arranged on each side plate 120 provided with the first inclined surface 1002, and the length of the bent portion 121 can be slightly smaller than the length of the corresponding side plate 120, which can also achieve the above-mentioned effects.

[0059] Optionally, a heat dissipation structure is arranged on the first inclined surface 1002, and the second inclined surface 201 of the light guide plate 200 is attached to the first inclined surface 1002, so that the heat dissipation structure can timely conduct the heat on the light guide plate 200 outwards, so as to reduce the expansion amount of the light guide plate 200. The specific material of the heat dissipation structure is not limited in the present embodiment, and the heat dissipation structure capable of being applied to the backlight module for heat dissipation in the prior art is within the protection scope of the present embodiment.

[0060] Figure 8 shows a structure schematic view of the glue frame 300 provided by the present embodiment from one perspective, Figure 9 shows Figure 8 a local enlarged view at C, Figure 10 shows a local structure schematic view of the glue frame 300 provided by the present embodiment from another perspective, as Figures 8-10 and in combination with Figure 3As shown, in the embodiment, the elastic member 310 comprises a connecting portion 311 and a pressing portion 312 which are arranged at an angle and connected, one end of the connecting portion 311 away from the pressing portion 312 is connected with the rubber frame 300, and the pressing surface 3121 of the pressing portion 312 presses against the top surface of the light guide plate 200. By arranging the connecting portion 311 and the pressing portion 312 separately, the elastic member 310 can have a pre-deformation amount, so as to facilitate further deformation of the elastic member 310 when the light guide plate 200 moves up and down relative to the back plate 100; by pressing the pressing surface 3121 of the pressing portion 312 against the top surface of the light guide plate 200, the contact area between the pressing portion 312 and the light guide plate 200 can be increased, so as to improve the stability of the cooperation between the elastic member 310 and the light guide plate 200.

[0061] Optionally, the number of the elastic member 310 is multiple, and the multiple elastic members 310 are arranged at intervals along the circumference of the rubber frame 300, so as to further ensure the stability of the movement of the light guide plate 200 relative to the back plate 100. In the embodiment, the number and arrangement position of the elastic member 310 correspond to the number and arrangement position of the bending portion 121, so as to reduce the number of the elastic member 310 while ensuring the stable movement of the light guide plate 200 relative to the back plate 100, thereby simplifying the processing procedure and reducing the processing cost. Of course, the number and arrangement position of the elastic member 310 are not limited in the embodiment, and the designer can adjust them according to actual use requirements.

[0062] Optionally, the elastic member 310 is integrally formed on the rubber frame 300, so as to omit the step of assembling the elastic member 310 and the rubber frame 300, improve the processing efficiency, and further reduce the processing cost.

[0063] Embodiment Two

[0064] The embodiment provides a backlight module, and the specific structure of the backlight module is substantially the same as that of the backlight module in Embodiment One, and the difference lies in that the first inclined surface 1002 is formed in different ways.

[0065] Figure 11 Fig. 1 shows a structural schematic view of the back plate 100 and the fitting member 400 provided in the embodiment, Figure 12 Fig. 2 shows a structural schematic view of the fitting member 400 provided in the embodiment, and Figures 11-12As shown, in the embodiment, the backlight module further comprises a right triangular prism-shaped fitting member 400, the fitting member 400 comprises a first face 401, a second face 402 and a third face connected in sequence, the first face 401 and the second face 402 are perpendicular to each other, the first face 401 and the second face 402 are connected to the cavity wall and the cavity bottom of the accommodating cavity 1001 respectively, and the third face forms the first inclined face 1002. The inner side of the bottom plate 110 of the back plate 100 forms the cavity bottom of the accommodating cavity 1001, and the inner wall of the side plate 120 of the back plate 100 forms the cavity wall of the accommodating cavity 1001. By arranging the right triangular prism-shaped fitting member 400, the fitting member 400 can be simultaneously fitted with the side plate 120 and the bottom plate 110, the stability of the connection between the fitting member 400 and the back plate 100 is ensured, and the fitting member 400 can be prevented from shaking during the up and down movement of the light guide plate 200 relative to the back plate 100 due to thermal expansion and contraction.

[0066] In the embodiment, the first face 401 is adhered to the side plate 120, and the second face 402 is adhered to the bottom plate 110, which is convenient to operate and stable in connection. Of course, in other embodiments, the fitting member 400 can also be connected to the back plate 100 in other connection manners, which are not limited herein. In addition, the fitting member 400 can also be integrally formed on the back plate 100, which can also achieve the above-mentioned effects.

[0067] It can be understood that, Figure 11 Only one fitting member 400 is shown in the figure, and actually, the fitting member 400 is arranged at each side plate 120 provided with the first inclined face 1002, so as to ensure the stability of the up and down movement of the light guide plate 200 relative to the back plate 100 during thermal expansion and contraction.

[0068] In some embodiments, at least two fitting members 400 can also be arranged at each side plate 120 provided with the first inclined face 1002, and the at least two fitting members 400 are arranged along the length direction of the side plate 120, which can also achieve the above-mentioned effects.

[0069] Embodiment three

[0070] The embodiment provides a backlight module, and the specific structure of the backlight module is substantially the same as that of the backlight module in the embodiment one, and the difference lies in that the structure of the elastic member 310 is different.

[0071] Reference Figure 3 In the embodiment, the elastic member 310 is a spring or a rubber block, one end of the elastic member 310 is connected to the rubber frame 300, and the other end of the elastic member 310 abuts against the light guide plate 200, which can also achieve the above-mentioned effects.

[0072] The number and the setting position of the elastic member 310 are not limited in the embodiment, and the designer can adjust the number and the setting position of the elastic member 310 according to actual use requirements.

[0073] Embodiment four

[0074] The display device provided in the embodiment comprises a display panel and a backlight module, the backlight module is used for supporting the display panel and can provide a backlight source for the display panel.

[0075] The basic principle, main features and advantages of the utility model are shown and described above.The skilled in the art should understand that the above-mentioned embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A backlight module, characterized in that, The backlight module comprises a back plate (100) provided with a containing cavity (1001) in the back plate (100), a first inclined surface (1002) is arranged on the cavity wall of the containing cavity (1001); a light guide plate (200) is arranged in the containing cavity (1001), and a second inclined surface (201) is arranged on the light guide plate (200) corresponding to the first inclined surface (1002), and the first inclined surface (1002) and the second inclined surface (201) are in close contact; a glue frame (300) is buckled on the back plate (100), and an elastic member (310) is arranged on the inner top wall of the glue frame (300), and the elastic member (310) is pressed against the top surface of the light guide plate (200). The back plate (100) comprises a bottom plate (110) and a plurality of side plates (120) arranged on the bottom plate (110), the plurality of side plates (120) are sequentially connected in a head-to-tail manner, and the bottom plate (110) and the plurality of side plates (120) form the containing cavity (1001). One of the side plates (120) is provided with a light source assembly, and the other two side plates (120) adjacent to the side plate (120) provided with the light source assembly are both provided with the first inclined surface (1002), and each of the first inclined surfaces (1002) corresponds to one of the second inclined surfaces (201). The other side plates (120) opposite to the side plate (120) provided with the light source assembly are provided with the first inclined surface (1002).

2. The backlight module of claim 1, wherein, At least part of the end of the side plate (120) away from the bottom plate (110) is bent into the containing cavity (1001) to form a bending part (121), and one side of the bending part (121) towards the center of the containing cavity (1001) forms the first inclined surface (1002). The first inclined surface (1002) is provided with a heat dissipation structure.

3. The backlight module of claim 2, wherein, The backlight module further comprises a right-angle triangular prism-shaped fitting member (400), the fitting member (400) comprises a first face (401), a second face (402) and a third face sequentially connected in a head-to-tail manner, the first face (401) and the second face (402) are perpendicular to each other, the first face (401) and the second face (402) are connected to the cavity wall and the cavity bottom of the containing cavity (1001) respectively, and the third face forms the first inclined surface (1002).

4. The backlight module of claim 2, wherein, The elastic member (310) comprises a connecting part (311) and a pressing part (312) arranged at an included angle and connected to each other, one end of the connecting part (311) away from the pressing part (312) is connected to the glue frame (300), and the pressing surface (3121) of the pressing part (312) is pressed against the top surface of the light guide plate (200).

5. The backlight module of claim 1, wherein, The elastic member (310) is integrally formed on the glue frame (300).

6. The backlight module of claim 1, wherein, The elastic member (310) is a spring or a rubber block.

7. The backlight module according to any one of claims 1-6, wherein, The backlight module is used for supporting the display panel and providing a backlight source for the display panel.

8. The backlight module of claim 7, wherein, ​ 9. The backlight module according to any one of claims 1-6, wherein, ​ 10. A display device, characterized by comprising: ​

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