Backlight module and liquid crystal display screen

Abstract

The utility model discloses a backlight module and a liquid crystal display screen. The backlight module comprises a back plate, a light guide plate and a light guide plate, the diffusion plate and one side of the back plate are arranged at an interval; the reflecting film is arranged on one side, facing the diffusion plate, of the back plate; the support assembly is arranged on the back plate and extends towards the diffusion plate to be used for supporting the diffusion plate, a boss protruding in the plane direction of the back plate is formed on the support assembly, and the boss abuts against the surface of the reflecting film to limit the reflecting film to be separated from the back plate. According to the backlight module, the boss is formed on the support assembly to abut against the reflecting film on the back plate, so that the reflecting film is limited to be separated from the back plate, the reflecting film cannot be warped and deformed under the influence of mechanical vibration or temperature change, the display effect of a liquid crystal display screen is guaranteed, and the service life of the liquid crystal display screen is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid crystal display screen technical field especially relates to a backlight module and liquid crystal display screen. BACKGROUND

[0002] The current liquid crystal display screen is usually composed of back plate, light source, optical film piece, liquid crystal display panel etc., and the backlight module structure of the liquid crystal display screen can be divided into two structures of side -in type and direct type according to the different placement positions of backlight source relative to liquid crystal display panel. In the direct type structure, the backlight source is arranged below the liquid crystal display panel, and a uniform area light source is formed by the point light source of matrix type through the diffusion plate, and since there is a certain light mixing distance between the light emitting surface and the diffusion plate, the diffusion plate support is usually arranged on the back plate of the module to support the diffusion plate to prevent its deformation and collapse.

[0003] However, in the existing backlight module, the assembly sequence of the diffusion plate support is before the installation of the reflective film, the diffusion plate support is first fixed to the back plate of the module by adhesive, and the reflective film is fixed to the back plate by adhesive, and there is no structure to reinforce the reflective film. After mechanical vibration and temperature change, the reflective film is prone to warping and deformation, which greatly reduces the distance between the reflective film and the diffusion plate after the reflective film is warped, thereby causing the problem of shadow on the display screen. SUMMARY

[0004] The utility model embodiment provides a kind of backlight module and liquid crystal display screen, to solve the problem that the reflective film in the existing direct type backlight module is prone to warping and deformation, which causes shadow on the display screen.

[0005] In the first aspect, the utility model embodiment provides a kind of backlight module, it includes:

[0006] back plate;

[0007] diffusion plate, with the side interval of the back plate is set;

[0008] reflective film, is located in the side of the back plate towards the diffusion plate;

[0009] support assembly, it is located on the back plate and extends towards the diffusion plate to support the diffusion plate, wherein the support assembly is formed with the boss that is protruding in the back plate plane direction, and the boss is in contact with the surface of the reflective film to limit the reflective film from the back plate.

[0010] In the backlight module provided by the utility model embodiment, the support assembly includes a buffer and a support, the buffer is connected to the back plate, the support is connected to the buffer and extends towards the diffusion plate, and the boss is formed on both sides of the buffer, wherein the buffer is used to elastically deform under stress.

[0011] In the backlight module provided in the embodiment of the utility model, the buffer piece has upper and lower edge frames which are arranged at intervals, the lower edge frame is connected to the back plate, a buffer port is formed between the upper edge frame and the lower edge frame, the supporting piece is connected to the upper edge frame and adjacent to the buffer port, and the bosses are formed at opposite ends of the lower edge frame.

[0012] In the backlight module provided in the embodiment of the utility model, the buffer piece further has first and second side edge frames which are arranged at intervals, the first side edge frame is connected to one end of the upper edge frame and the lower edge frame respectively, the second side edge frame is connected to the other end of the upper edge frame and the lower edge frame respectively, the buffer port is located between the first side edge frame and the second side edge frame, wherein the length of the upper edge frame is less than the length of the lower edge frame, and the length of the first side edge frame is equal to the length of the second side edge frame.

[0013] In the backlight module provided in the embodiment of the utility model, the supporting piece has opposite first and second inclined surfaces, one end of the first inclined surface and the second inclined surface is connected to the top of the buffer piece, and the other end of the first inclined surface and the second inclined surface is inclined towards the diffusion plate and connected.

[0014] In the backlight module provided in the embodiment of the utility model, the supporting piece further has opposite first and second planes, the first plane and the second plane are parallel to each other, and the first inclined surface and the second inclined surface are located between the first plane and the second plane.

[0015] In the backlight module provided in the embodiment of the utility model, the bracket assembly further includes a connecting plate, the connecting plate is pasted on the back plate, the bottom of the buffer piece is fixed on the connecting plate, and the reflecting film covers the connecting plate.

[0016] In the backlight module provided in the embodiment of the utility model, the backlight module further includes a light source assembly for emitting light, and the light source assembly is arranged on the back plate and distributed around the bracket assembly.

[0017] In the backlight module provided in the embodiment of the utility model, a sink is concavely formed on the back plate, the bottom of the sink is provided with a mounting hole, and the mounting hole is used for fixing the back plate by cooperating with a screw.

[0018] In the second aspect, the embodiment of the utility model provides a liquid crystal display screen, which comprises the backlight module provided in any one of the embodiments of the utility model.

[0019] The utility model discloses an embodiment provides a backlight module, include: backboard, diffusion plate is set up with the one side interval of backboard, reflection film is equipped with the one side of backboard towards diffusion plate, support assembly is equipped with the backboard and extends towards diffusion plate for supporting diffusion plate, wherein, the support assembly forms the boss that protrudes in the backboard plane direction, and the boss and the surface of reflection film abut to restrict reflection film and separate backboard. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be needed to use the drawing in the embodiment description briefly introduced, obviously, the following description in the drawing is some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0021] Figure 1 It is the side sectional view of the backlight module provided by the utility model embodiment;

[0022] Figure 2 It is the exploded view of the backlight module provided by the utility model embodiment;

[0023] Figure 3 It is the A part enlarged view of Figure 1

[0024] Figure 4 It is the partial structure diagram of the backlight module provided by the utility model embodiment;

[0025] Figure 5 It is another partial structure diagram of the backlight module provided by the utility model embodiment;

[0026] Figure 6 It is the front view of support assembly provided by the utility model embodiment;

[0027] Figure 7 It is the side view of support assembly provided by the utility model embodiment;

[0028] Figure 8 It is the B part enlarged view of Figure 2

[0029] The reference signs in the drawing are:

[0030] ​​10, back plate; 11, sink; 101, mounting hole; 20, diffusion plate; 30, reflective film; 40, support assembly; 401, boss; 402, buffer port; 41, buffer; 411, upper frame; 412, lower frame; 413, first side frame; 414, second side frame; 42, support; 421, first inclined surface; 422, second inclined surface; 423, first plane; 424, second plane; 43, connecting plate; 50, light source assembly. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] The terms of direction mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only the directions of reference to the drawings. Therefore, the terms of direction are used to explain and understand the present application, rather than to limit the present application. In addition, in the drawings, the structures similar or identical are indicated by the same reference numerals.

[0033] Referring to Figures 1 to 8 , specifically referring to Figures 1 to 5 , which shows an embodiment of the backlight module provided by the present application, the structure and working principle of the backlight module will be described in detail below with reference to the drawings in the specification. The backlight module comprises: a back plate 10; a diffusion plate 20, which is arranged at a side of the back plate 10; a reflective film 30, which is arranged at a side of the back plate 10 facing the diffusion plate 20; and a support assembly 40, which is arranged on the back plate 10 and extends towards the diffusion plate 20 to support the diffusion plate 20. The support assembly 40 is formed with a boss 401 protruding in the plane direction of the back plate 10, and the boss 401 abuts against the surface of the reflective film 30 to limit the reflective film 30 from being separated from the back plate 10.

[0034] In a specific implementation, the backlight module is mainly of a direct type structure, and mainly includes a back plate 10, a diffusion plate 20, a reflective film 30, and a support assembly 40. In addition, it can also include structures such as a light source and a light guide plate. The diffusion plate 20 and the back plate 10 are parallel to each other on one side and maintain a certain interval. The diffusion plate 20 is an optical film structure with a micro concave-convex structure, mainly used for uniformly scattering light emitted by the light source, reducing light spots and uneven brightness, and thus improving the uniformity of the display screen. The space between the diffusion plate 20 and the back plate 10 serves as a light mixing cavity, mainly used for mixing light. The reflective film 30 is attached to the side of the back plate 10 facing the diffusion plate 20 and is entirely in the light mixing cavity. The reflective film 30 is designed from an optical material and can reflect light leaked from the light guide plate back, reducing light loss and increasing backlight brightness. The reflective film 30 is usually fixed on the side of the back plate 10 facing the diffusion plate 20 by means of back adhesive. Since various protruding structures or components will be installed on the back plate 10, the reflective film 30 will be provided with openings at corresponding positions to avoid the various protruding structures or components on the back plate 10. The support assembly 40 is arranged on the back plate 10. The reflective film 30 is provided with openings at positions of the support assembly 40 to avoid the support assembly 40. The support assembly 40 extends towards the diffusion plate 20 as a whole, and the overall extension length thereof is slightly smaller than the interval between the back plate 10 and the diffusion plate 20. The support assembly 40 is mainly used to support the diffusion plate 20 to prevent the diffusion plate 20 from collapsing due to gravity or other external forces. The support assembly 40 is provided in multiple numbers, and all the support assemblies 40 are regularly distributed on the back plate 10 according to design requirements, thereby providing support for multiple positions on the diffusion plate 20. The support assembly 40 is formed with a boss 401 protruding in the plane direction of the back plate 10. The number of the boss 401 is arbitrarily set. The boss 401 is entirely located at the bottom position of the support assembly 40 and leaves a certain gap with the back plate 10. The part of the reflective film 30 avoiding the openings is located between the boss 401 and the back plate 10, and the boss 401 abuts against the upper surface of the reflective film 30. In actual application, the reflective film 30 is affected by mechanical vibration or temperature change, the adhesive used to attach the reflective film 30 may reduce in adhesion, thereby causing the reflective film 30 to easily warp and deform. However, since the boss 401 on the support assembly 40 abuts against the surface of the reflective film 30, the reflective film 30 is resisted by the boss 401. Even if the adhesion of the adhesive reduces, the reflective film 30 will be limited by the boss 401 when it warps and cannot be separated from the back plate 10. The reflective film 30 will not warp and deform greatly.

[0035] The backlight module of the embodiment limits the reflective film from separating from the back plate by forming a boss on the support assembly to abut against the reflective film on the back plate, so that the reflective film will not warp and deform due to the influence of mechanical vibration or temperature change, thereby ensuring the display effect of the liquid crystal display screen and prolonging the service life of the liquid crystal display screen.

[0036] In an embodiment, referring to Figures 3 to 7 , the support assembly 40 comprises a buffer 41 connected to the back plate 10 and a support 42 connected to the buffer 41 and extending towards the diffusion plate 20, and the boss 401 is formed on both sides of the buffer 41, wherein the buffer 41 is used for elastic deformation under force. In a specific implementation, the support assembly 40 comprises the buffer 41 and the support 42, and the buffer 41 is a structure capable of elastic deformation under force, such as a frame structure or a spring structure composed of elastic material. The buffer 41 will elastically deform under extrusion or impact of external force, that is, the buffer 41 will deform under extrusion or impact of external force, and can restore to the original shape after the external force disappears. The buffer 41 is connected to the back plate 10, and the support 42 is connected to the top of the buffer 41 and extends straight towards the diffusion plate 20, and the support 42 is a structure used for directly contacting the diffusion plate 20 for support. In actual application, when the diffusion plate 20 is subjected to pressure or impact, the pressure or impact force is transmitted to the buffer 41 through the support 42, and the buffer 41 can form a buffer through elastic deformation, effectively dispersing the pressure or impact force, absorbing kinetic energy, and avoiding damage to the diffusion plate 20.

[0037] Further, referring to Figure 6The buffer 41 has an upper frame 411 and a lower frame 412 arranged in an upper-lower interval, the lower frame 412 is connected to the back plate 10, and the buffer port 402 is formed between the upper frame 411 and the lower frame 412. The support 42 is connected to the upper frame 411 and adjacent to the buffer port 402. The boss 401 is formed at opposite ends of the lower frame 412. In the embodiment, the buffer 41 is designed as a polygonal frame structure, specifically a quadrilateral frame structure. The buffer 41 has the upper frame 411 and the lower frame 412 arranged in an upper-lower interval and parallel to each other. The buffer port 402 is formed between the upper frame 411 and the lower frame 412 by the interval arrangement. The lower frame 412 is connected to the back plate 10, and the upper frame 411 is directly above the upper frame 411. The support 42 is connected to the upper frame 411 and adjacent to one side of the buffer port 402. The buffer port 402 between the upper frame 411 and the lower frame 412 serves as a buffer area, and the boss 401 is formed at opposite ends of the lower frame 412. The two ends of the lower frame 412 abut against the surface of the reflective film 30, thereby limiting the warping of the reflective film 30. In actual application, when the diffusion plate 20 is subjected to pressure or impact, the pressure or impact force is transmitted to the upper frame 411 through the support 42. Since the buffer port 402 is formed between the upper frame 411 and the lower frame 412, the upper frame 411 will elastically bend to a certain extent towards the lower frame 412, the buffer port 402 deforms, thereby forming a buffer, effectively dispersing the pressure or impact force, absorbing kinetic energy, effectively avoiding damage to the diffusion plate 20. At the same time, the buffer port 402 can transmit light, reducing the obstruction of light and enhancing the light mixing effect.

[0038] Further, with reference to Figure 6The buffer 41 further has a first side frame 413 and a second side frame 414 arranged at left and right sides, two ends of the first side frame 413 are connected to one end of the upper frame 411 and the lower frame 412 respectively, two ends of the second side frame 414 are connected to the other end of the upper frame 411 and the lower frame 412 respectively, and the buffer port 402 is located between the first side frame 413 and the second side frame 414. In the specific implementation, the length of the upper frame 411 is less than the length of the lower frame 412, and the length of the first side frame 413 is equal to the length of the second side frame 414. In the specific implementation, the buffer 41 further has a first side frame 413 and a second side frame 414 arranged at left and right sides, two ends of the first side frame 413 are connected to one end of the upper frame 411 and the lower frame 412 respectively, two ends of the second side frame 414 are connected to the other end of the upper frame 411 and the lower frame 412 respectively, and the buffer port 402 is located between the first side frame 413 and the second side frame 414. The buffer 41 has an isosceles trapezoidal frame structure as a whole, the length of the upper frame 411 is less than the length of the lower frame 412, and the length of the first side frame 413 is equal to the length of the second side frame 414, and the two are oppositely inclined. In actual application, when the diffusion plate 20 is subjected to pressure or impact, the pressure or impact force is transmitted to the upper frame 411 through the support 42, the upper frame 411 is elastically bent to a certain extent towards the lower frame 412, and at the same time, the pressure or impact force is also uniformly dispersed to the first side frame 413 and the second side frame 414 through the upper frame 411, the first side frame 413 and the second side frame 414 are deformed to a certain extent, so that the pressure or impact force can be uniformly dispersed and the kinetic energy can be absorbed, thereby providing more reliable protection for the diffusion plate 20.

[0039] In one embodiment, with reference to Figure 6 and Figure 7The support 42 has opposite first and second inclined surfaces 421 and 422, one end of each of the first and second inclined surfaces 421 and 422 being connected to the top of the buffer 41 at a distance from each other, and the other end of each of the first and second inclined surfaces 421 and 422 being inclined towards the diffusion plate 20 and connected together. In a specific embodiment, the support 42 is designed as a triangular structure, the support 42 has opposite first and second inclined surfaces 421 and 422, one end of each of the first and second inclined surfaces 421 and 422 being connected to the top of the buffer 41 at a distance from each other, and the other end of each of the first and second inclined surfaces 421 and 422 being inclined towards the diffusion plate 20 and connected together, the connected end of the first and second inclined surfaces 421 and 422 being the vertex of the support 42, which is used to contact the lower surface of the diffusion plate 20 to support the diffusion plate 20. The lengths of the first and second inclined surfaces 421 and 422 can be designed to be equal, so that the overall shape of the support 42 is an isosceles triangle, and the support 42 designed as a triangular structure can provide more stable support for the diffusion plate 20.

[0040] Further, referring to Figure 6 and Figure 7 , the support 42 further has opposite first and second flat surfaces 423 and 424, the first and second flat surfaces 423 and 424 being parallel to each other, and the first and second inclined surfaces 421 and 422 being located between the first and second flat surfaces 423 and 424. In a specific embodiment, the support 42 further has first and second flat surfaces 423 and 424, the first and second flat surfaces 423 and 424 being opposite surfaces of the support 42, the first and second flat surfaces 423 and 424 being parallel to each other, and the first and second inclined surfaces 421 and 422 being located between the first and second flat surfaces 423 and 424, i.e. the first and second inclined surfaces 421 and 422 being surfaces sandwiched between the first and second flat surfaces 423 and 424, so that the support 42 is formed as a triangular prism structure, which can provide stable support for the diffusion plate 20, reduce the blocking of light, and enhance the light mixing effect.

[0041] In an embodiment, referring to Figures 4 to 8The support assembly 40 further comprises a connecting plate 43, the connecting plate 43 is pasted on the back plate 10, the bottom of the buffer 41 is fixed on the connecting plate 43, and the reflecting film 30 covers the connecting plate 43. In the embodiment, the support assembly 40 further comprises the connecting plate 43, the connecting plate 43 is a thin plate structure, which is mainly used to connect the buffer 41 and the support 42 to the back plate 10, the bottom of the buffer 41 is fixed on the connecting plate 43 to form an integrated structure, and the connecting plate 43 is pasted on the back plate 10 by the back adhesive, so that the buffer 41 and the support 42 are fixed on the back plate 10. Since the connecting plate 43 is connected to the back plate 10 by pasting, it is more convenient to disassemble.

[0042] In an embodiment, referring to Figures 1 to 5 The backlight module further comprises a light source assembly 50 for emitting light, and the light source assembly 50 is arranged on the back plate 10 and distributed around the support assembly 40. In the embodiment, the backlight module further comprises the light source assembly 50, which is mainly used to emit light to form the backlight source of the module, and is arranged on the back plate 10. The number of the light source assembly 50 is multiple, and is distributed around the support assembly 40.

[0043] In an embodiment, referring to Figure 8 The back plate 10 is recessed to form a sink 11, the bottom of the sink 11 is provided with a mounting hole 101, and the mounting hole 101 is used to cooperate with a screw to fix the back plate 10. In the embodiment, the sink 11 is recessed on the corresponding position of the back plate 10, and the mounting hole 101 is arranged at the bottom of the sink 11. The mounting hole 101 is used to cooperate with the screw to fix the back plate 10. In actual application, the back plate 10 is fixed to the shell of the display screen or other mounting structure through the screw passing through the mounting hole 101, so as to realize the mounting of the module. The structure of the sink 11 can hide the screw, and the head of the screw can be completely accommodated in the sink 11 after the screw is completely tightened, so as to prevent the screw from protruding on the back plate 10 and affecting the flatness of the reflecting film 30.

[0044] In an embodiment, a liquid crystal display screen is provided, which applies the backlight module described in the above embodiments. In addition to the backlight module, the liquid crystal display screen further comprises a shell, a main board, a display panel and other components. The backlight module is used to provide sufficient and uniformly distributed light sources, so that the liquid crystal display screen can display images. Since the specific structure and working principle of the backlight module have been described in detail in the foregoing description, they will not be described here for the sake of brevity.

[0045] The liquid crystal display screen in the embodiment does not appear the screen shadow phenomenon when being affected by mechanical vibration or temperature change, has better reliability and longer service life.

[0046] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A backlight module, characterized in that, include: Back panel; A diffuser plate is disposed at a distance from one side of the back plate; A reflective film is disposed on the side of the back plate facing the diffuser plate; A support assembly is disposed on the back plate and extends toward the diffuser plate to support the diffuser plate, wherein the support assembly is formed with a boss protruding in the plane direction of the back plate, the boss abutting against the surface of the reflective film to prevent the reflective film from detaching from the back plate.

2. The backlight module according to claim 1, characterized in that, The support assembly includes a buffer and a support. The buffer is connected to the back plate, and the support is connected to the buffer and extends toward the diffuser plate. The bosses are formed on both sides of the buffer, wherein the buffer is used to undergo elastic deformation under force.

3. The backlight module according to claim 2, characterized in that, The buffer has an upper frame and a lower frame that are spaced apart vertically. The lower frame is connected to the back plate. A buffer opening is formed between the upper frame and the lower frame. The support is connected to the upper frame and adjacent to the buffer opening. The boss is formed at opposite ends of the lower frame.

4. The backlight module according to claim 3, characterized in that, The buffer also has a first side frame and a second side frame spaced apart on the left and right. The two ends of the first side frame are respectively connected to one end of the upper frame and one end of the lower frame. The two ends of the second side frame are respectively connected to the other end of the upper frame and the lower frame. The buffer opening is located between the first side frame and the second side frame. The length of the upper frame is less than the length of the lower frame. The length of the first side frame is equal to the length of the second side frame.

5. The backlight module according to any one of claims 2-4, characterized in that, The support has a first inclined surface and a second inclined surface, one end of each of the first inclined surface and the second inclined surface is connected to the top of the buffer, and the other end of each of the first inclined surface and the second inclined surface is inclined toward and connected to the diffuser plate.

6. The backlight module according to claim 5, characterized in that, The support member also has a first plane and a second plane facing away from each other, the first plane and the second plane being parallel to each other, and the first inclined plane and the second inclined plane being located between the first plane and the second plane.

7. The backlight module according to any one of claims 2-4, characterized in that, The bracket assembly also includes a connecting plate, which is attached to the back plate, the bottom of the buffer is fixed to the connecting plate, and the reflective film covers the connecting plate.

8. The backlight module according to any one of claims 2-4, characterized in that, The backlight module also includes a light source assembly for emitting light, which is disposed on the back plate and distributed around the support assembly.

9. The backlight module according to any one of claims 2-4, characterized in that, The back plate has a recessed groove, and the bottom of the groove has a mounting hole for fixing the back plate with screws.

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

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