Backlight module and display equipment

Abstract

The utility model discloses a backlight module and a display device, the backlight module comprises a back plate, a backlight assembly, a middle frame and at least one elastic limiting pad, the backlight assembly comprises an optical film, a diffusion plate and a reflector plate which are stacked in sequence, and the reflector plate is installed on the back plate; the middle frame is mounted on the back plate, and the middle frame and the back plate define a limiting groove facing the side end of the backlight assembly; the elastic limiting pad is located in the limiting groove, the side end of the backlight assembly is inserted into the limiting groove, and the diffusion plate is right opposite to the elastic limiting pad. According to the backlight module, the elastic limiting pad is arranged in the limiting groove defined by the middle frame and the back plate, the backlight assembly is inserted into the limiting groove, the elastic limiting pad has good flexibility, when the diffusion plate is heated to expand, the diffusion plate can compress the elastic limiting pad, the diffusion plate cannot be arched due to stress, and therefore the backlight module is not damaged. The elastic limiting pad has the functions of supporting and limiting the diffusion plate, the high-temperature expansion phenomenon of the diffusion plate is avoided, wrinkles are avoided, and abnormal and bad pictures or scratches cannot be caused.

Description

Technical Field

[0001] The utility model relates to the technical field of display structure, in particular to a backlight module and a display device. Background Art

[0002] The assembly order of the traditional direct-down display module is to first fix the light bar, reflector, diffuser and membrane on the back panel in sequence, then fix the middle frame on the back panel by snapping or screwing, then place the LCD display glass, and finally fix the front frame on the back panel by snapping or screwing.

[0003] When the direct-type display module is working, heat will be generated inside, which will cause the diffusion plate to expand. Currently, there are two main ways to fix the diffusion plate in the direct-type display module:

[0004] 1. Use the back panel ear to limit the position. Specifically, the inner wall of the back panel is provided with an ear to limit the diffuser. However, when the diffuser expands due to heat, it will abut against the ear, resulting in insufficient expansion gap of the diffuser. The diffuser is arched due to force, thereby causing wrinkles, resulting in abnormal pictures, noise when the machine is shaken, and damage to the edge of the diffuser, resulting in light leakage and other defects.

[0005] 2. Use double-sided tape to bond the end of the diffuser plate to the back plate, and the diffuser plate is fixed. However, when the diffuser plate expands due to heat, the expansion gap of the diffuser plate will be insufficient, and the diffuser plate will be arched due to force, causing wrinkles, resulting in abnormal images, complex processes, and difficult positioning. Utility Model Content

[0006] The utility model provides a backlight module and a display device, aiming to solve the technical problem in the prior art that after a diffusion plate in a direct-type display module is fixed, the expansion gap of the diffusion plate is insufficient, the diffusion plate is arched by force, wrinkles are caused, and an abnormal picture is caused.

[0007] The utility model provides a backlight module, comprising:

[0008] Back panel;

[0009] A backlight assembly, the backlight assembly comprising an optical film, a diffuser, and a reflector stacked in sequence, the reflector being mounted on the back panel;

[0010] A middle frame, the middle frame is mounted on the back plate and is enclosed with the back plate to form a limiting groove toward the side end of the backlight assembly;

[0011] At least one elastic limiting pad is located in the limiting groove, the side end of the backlight assembly is inserted into the limiting groove, and the diffusion plate is arranged opposite to the elastic limiting pad.

[0012] Furthermore, the elastic limiting pad includes a bottom pad and two limiting parts respectively protruding from the two ends of the top of the bottom pad, and the middle frame is provided with at least one protruding part, which is inserted between the two limiting parts and presses the bottom pad against the back plate.

[0013] Furthermore, a dimension of the bottom pad along a width direction of the elastic limiting pad is greater than a dimension of the limiting portion along the width direction of the elastic limiting pad, and the diffusion plate is arranged opposite to the bottom pad.

[0014] Furthermore, the limiting portion is arranged close to an edge of the bottom pad on a side away from the diffusion plate.

[0015] Furthermore, the base pad and the two limiting portions are both bonded to the inner side walls of the limiting groove.

[0016] Furthermore, the back panel includes a buckle cover, a support plate and a side panel which are connected in sequence, the support plate is vertically connected to the side panel, the side panel is connected to the middle frame, and the elastic limiting pad is bonded to the side panel.

[0017] Furthermore, the middle frame includes a side support arm and a frame body connected to the side support arm, a slot is provided at the connection between the frame body and the side support arm, the side panel is inserted into the slot, and the frame body, the side panel and the support plate are enclosed to form the limiting groove.

[0018] Furthermore, the backlight module also includes a front frame, a liquid crystal glass and a first buffer component. The front frame is installed on the middle frame and is enclosed with the middle frame to form a positioning cavity. The liquid crystal glass is arranged on the side of the optical film away from the diffuser plate. The side end of the liquid crystal glass is inserted into the positioning cavity. The frame body is provided with a groove connected to the positioning cavity. The first buffer component is installed in the groove and connected to the liquid crystal glass.

[0019] Furthermore, the backlight module further comprises a second buffer installed in the positioning cavity, and the second buffer and the first buffer are respectively arranged on opposite sides of the liquid crystal glass; and / or,

[0020] The backlight module further comprises a light bar, which is mounted on the back plate and passes through the reflective sheet.

[0021] The utility model also provides a display device, comprising the backlight module as described above.

[0022] Compared with the prior art, the beneficial effects of the present invention include at least:

[0023] In the utility model, an elastic limiting pad is arranged in the limiting groove formed by the middle frame and the back plate, and the backlight assembly is inserted into the limiting groove. The elastic limiting pad has good elasticity. When the diffusion plate expands due to heat, the diffusion plate will compress the elastic limiting pad, and the diffusion plate will not be arched due to force. There is enough gap. The elastic limiting pad has the function of supporting and limiting the diffusion plate, which meets the high-temperature expansion phenomenon of the diffusion plate, avoids wrinkles, and will not cause abnormal poor picture or scratches. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A partial cross-sectional view of a backlight module provided by an embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the structure of the elastic limiting pad provided in the embodiment of the utility model;

[0026] Figure 3 A schematic diagram of the structure of an elastic limiting pad provided in an embodiment of the utility model bonded with double-sided adhesive tape;

[0027] Figure 4 A schematic diagram of the structure in which the elastic limiting pad provided in the embodiment of the utility model is fixed to a part of the back plate;

[0028] Figure 5 A partial cross-sectional view of a middle frame provided in an embodiment of the utility model;

[0029] Figure 6 A partial cross-sectional view of a back plate provided in an embodiment of the utility model.

[0030] In the figure:

[0031] 10. Back panel; 11. Buckle cover; 12. Support plate; 13. Side panel; 20. Backlight assembly; 21. Optical film; 22. Diffuser plate; 23. Reflector; 30. Middle frame; 31. Protrusion; 32. Side arm; 33. Frame; 331. Groove; 34. Slot; 40. Elastic limiting pad; 41. Bottom pad; 42. Limiting part; 50. Limiting groove; 60. Double-sided tape; 70. Front frame; 80. Liquid crystal glass; 90. First buffer; 100. Positioning cavity; 200. Second buffer. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0033] See also Figure 1As shown, an embodiment of the utility model discloses a backlight module, which is mainly used in the field of display device technology. In addition to TV modules, it can also be used in display devices such as desktop monitors, interactive all-in-one machines, smart blackboards, commercial TVs and advertising machines.

[0034] The backlight module includes a back plate 10, a backlight assembly 20, a middle frame 30 and at least one elastic limiting pad 40. The backlight assembly 20 includes an optical film 21, a diffuser 22 and a reflector 23 which are stacked in sequence from top to bottom. The reflector 23 is installed on the back plate 10; the middle frame 30 is installed on the back plate 10 and is enclosed with the back plate 10 to form a limiting groove 50 arranged toward the side end of the backlight assembly 20. The limiting groove 50 is a laterally arranged U-shaped structure. The elastic limiting pad 40 is located in the limiting groove 50. The side end of the backlight assembly 20 is inserted into the limiting groove 50. The diffuser plate 22 is arranged opposite to the elastic limiting pad 40. When the diffuser plate 22 expands due to heat, the diffuser plate 22 will compress the elastic limiting pad 40 to limit the diffuser plate 22. The diffuser plate 22 will not be arched by force, and there is enough gap to meet the high-temperature expansion phenomenon of the diffuser plate 22, avoid wrinkles, and will not cause abnormal poor picture or scratches. The elastic limiting pad 40 can be a silicone pad.

[0035] In this embodiment, the elastic limiting pad 40 is used to limit the diffuser plate 22. The elastic limiting pad 40 and the diffuser plate 22 are spaced apart. The gap L1 of the assembly interval is 0.2 mm, which can allow the diffuser plate 22 to have more expansion gap.

[0036] In some embodiments, the number of elastic limiting pads 40 is eight, the limiting groove 50 is arranged in an annular shape, and two elastic limiting pads 40 are installed at the upper, lower, left and right positions of the limiting groove 50, which can effectively prevent the diffusion plate 22 from moving in the upper, lower, left and right directions in the limiting groove 50.

[0037] Please read further Figures 1 to 5 As shown, in this embodiment, the elastic limiting pad 40 includes a bottom pad 41 and two limiting portions 42 respectively protruding from the top ends of the bottom pad 41. The middle frame 30 is provided with at least one protruding portion 31, and the protruding portion 31 is inserted between the two limiting portions 42. The middle frame 30 presses the bottom pad 41 against the back plate 10 through the protruding portion 31. The protruding portion 31 can serve as an anti-flip rib of the middle frame 30, and plays a role in preventing the elastic limiting pad 40 from rotating. Figure 1 The elastic limiting pad 40 is limited in the vertical direction to achieve the limiting fixation of the elastic limiting pad 40.

[0038] In some embodiments, the limiting portion 42 is arranged near the edge of the bottom pad 41 away from the diffuser plate 22, the dimension L2 of the bottom pad 41 along the width direction of the elastic limiting pad 40 is larger than the dimension L3 of the limiting portion 42 along the width direction of the elastic limiting pad 40, the diffuser plate 22 is arranged opposite to the bottom pad 41, when the diffuser plate 22 expands due to heat, the diffuser plate 22 mainly acts on the bottom pad 41, the diffuser plate 22 will compress the bottom pad 41 to produce deformation, the acting surface is small, the elastic limiting pad 40 is compressed more obviously, and the expansion gap of the diffuser plate 22 is more sufficient to further avoid wrinkles on the diffuser plate 22.

[0039] The bottom pad 41 and the two limiting portions 42 are bonded to the inner wall of the limiting groove 50 by double-sided tape 60 to fasten the elastic limiting pad 40 to the inner wall of the limiting groove 50. In this embodiment, since the protrusion 31 of the middle frame 30 presses the bottom pad 41 against the back plate 10, the elastic limiting pad 40 is structurally limited. Therefore, even if the double-sided tape 60 fails, the position of the elastic limiting pad 40 will not change because it is fixed by the protrusion 31.

[0040] Please read further Figure 1 , Figures 3 to 6 In this embodiment, the back panel 10 includes a buckle cover 11, a support plate 12 and a side panel 13 connected in sequence. The support plate 12 is vertically connected to the side panel 13, and the side panel 13 is connected to the middle frame 30. The elastic limiting pad 40 is bonded to the side panel 13 by a double-sided adhesive tape 60. The double-sided adhesive tape 60 is on the side of the elastic limiting pad 40 away from the diffuser 22. The advantage of this is that when the diffuser 22 expands, the elastic limiting pad 40 is prevented from expanding and contracting, causing the double-sided adhesive tape 60 to fail. The elastic limiting pad 40 can prevent the diffuser 22 from directly colliding with the metal back panel 10 to prevent noise.

[0041] In some embodiments, after the elastic limiting pad 40 is bonded to the back panel 10 , an assembly gap L4 of 0.5 mm can be reserved from the elastic limiting pad 40 to the left and right edges of the side panels 13 , and no additional scale lines are needed to position the elastic limiting pad 40 .

[0042] The middle frame 30 includes a side arm 32 and a frame body 33 connected to a side surface of the middle part of the side arm 32. A vertically arranged slot 34 is provided at the bottom of the connection between the frame body 33 and the side arm 32. The side panel 13 is inserted into the slot 34. The middle frame 30 and the back panel 10 are connected by plugging. The elastic limiting pad 40 can be used as part of the design to prevent the middle frame 30 from flipping over. It plays a limiting role on the side panel 13 on the back panel 10 to prevent the middle frame 30 from flipping over. The frame body 33, the side panel 13 and the support plate 12 are enclosed to form the limiting groove 50, and the protrusion 31 is arranged on the frame body 33.

[0043] In this embodiment, the flange of the back plate 10 can be used as an assembly reference for the elastic limiting pad 40, and there is no need to add additional markings to position the elastic limiting pad 40. The flange of the back plate 10 can prevent the elastic limiting pad 40 from falling off during transportation or vibration testing.

[0044] In this embodiment, the backlight module also includes a front frame 70, a liquid crystal glass 80, a light bar and a first buffer component 90. The light bar is installed on the back panel 10 and passes through the reflective sheet 23. The front frame 70 is installed on the middle frame 30 and is enclosed with the middle frame 30 to form a laterally arranged positioning cavity 100. The liquid crystal glass 80 is arranged on the side of the optical film 21 away from the diffuser plate 22. The side end of the liquid crystal glass 80 is inserted into the positioning cavity 100. The frame body 33 is provided with a groove 331 connected to the positioning cavity 100. The first buffer component 90 is installed in the groove 331 and is connected to the liquid crystal glass 80 to avoid collision between the liquid crystal glass 80 and the middle frame 30. The first buffer component 90 can be a buffer cotton.

[0045] In some embodiments, the backlight module also includes a second buffer member 200 installed in the positioning cavity 100. The second buffer member 200 and the first buffer member 90 are respectively arranged on opposite sides of the liquid crystal glass 80 to avoid collision between the liquid crystal glass 80 and the front frame 70. The second buffer member 200 can be a buffer cotton.

[0046] In this embodiment, the elastic limit pad 40 can be used as an assembly reference, and the elastic limit pad 40 is used for limiting. The functions such as the anti-turnover structure of the middle frame 30 are integrated in one place. The back panel 10 is provided with a middle frame snap position, a front frame screw position, a COF position, a diaphragm ear position, an elastic limit pad assembly position and a middle frame anti-turnover position. The size of the back panel 10 is limited, especially for small models, and there is not enough space to meet all functions, so it is necessary to make trade-offs. Therefore, it is particularly important to combine various functional positions together.

[0047] The utility model also discloses a display device, comprising the backlight module as described above.

[0048] The backlight module has the following beneficial effects:

[0049] 1. The elastic limiting pad 40 made of silicone material can limit the diffusion plate 22. The elastic limiting pad 40 has good elasticity. When the diffusion plate 22 expands due to heat, the elastic limiting pad 40 will be compressed, and the diffusion plate 22 will not be arched due to force, which will not cause poor picture or scratches.

[0050] 2. The elastic limiting pad 40 has good cushioning properties. During the transportation of the display device, the diffuser plate 22 will not be damaged by force, causing light leakage and other defects. When the display device is shaken, the diffuser plate 22 will not directly collide with the back plate 10 made of metal material, avoiding noise.

[0051] 3. The position of the elastic limiting pad 40 is integrated with the position of the middle frame 30, so the back panel 10 can be designed more reasonably without making any trade-offs. The product performance of the display device is more stable, the structure of the back panel 10 is simpler, unnecessary openings can be reduced, and the strength is good.

[0052] To sum up, in the utility model, an elastic limiting pad 40 is arranged in the limiting groove 50 formed by the middle frame 30 and the back plate 10, and the backlight assembly 20 is inserted into the limiting groove 50. The elastic limiting pad 40 has good elasticity. When the diffuser plate 22 expands due to heat, the diffuser plate 22 will compress the elastic limiting pad 40, and the diffuser plate 22 will not be arched due to force. There is enough gap. The elastic limiting pad 40 has the function of supporting and limiting the diffuser plate 22, which meets the high-temperature expansion phenomenon of the diffuser plate 22, avoids wrinkles, and will not cause abnormal picture quality or scratches.

[0053] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A backlight module, characterized in that: include: Back panel; A backlight assembly, the backlight assembly comprising an optical film, a diffuser, and a reflector stacked in sequence, the reflector being mounted on the back panel; A middle frame, the middle frame is mounted on the back plate and is enclosed with the back plate to form a limiting groove toward the side end of the backlight assembly; At least one elastic limiting pad is located in the limiting groove, the side end of the backlight assembly is inserted into the limiting groove, and the diffusion plate is arranged opposite to the elastic limiting pad.

2. The backlight module according to claim 1, characterized in that: The elastic limiting pad includes a bottom pad and two limiting parts respectively protruding from the top ends of the bottom pad. The middle frame is provided with at least one protruding part, which is inserted between the two limiting parts and presses the bottom pad against the back plate.

3. The backlight module according to claim 2, characterized in that: The dimension of the bottom pad along the width direction of the elastic limiting pad is greater than the dimension of the limiting portion along the width direction of the elastic limiting pad, and the diffusion plate is arranged opposite to the bottom pad.

4. The backlight module according to claim 2, characterized in that: The limiting portion is arranged close to an edge of the bottom pad at a side away from the diffusion plate.

5. The backlight module according to claim 2, characterized in that: The bottom pad and the two limiting parts are both bonded to the inner side walls of the limiting groove.

6. The backlight module according to claim 1, characterized in that: The back plate includes a buckle cover, a support plate and a side plate which are connected in sequence, the support plate is vertically connected to the side plate, the side plate is connected to the middle frame, and the elastic limiting pad is bonded to the side plate.

7. The backlight module according to claim 6, characterized in that: The middle frame includes a side support arm and a frame body connected to the side support arm. A slot is provided at the connection between the frame body and the side support arm. The side plate is inserted into the slot, and the frame body, the side plate and the support plate are combined to form the limiting groove.

8. The backlight module according to claim 7, characterized in that: The backlight module also includes a front frame, a liquid crystal glass and a first buffer member. The front frame is installed on the middle frame and encloses a positioning cavity with the middle frame. The liquid crystal glass is arranged on a side of the optical film away from the diffuser plate. The side end of the liquid crystal glass is inserted into the positioning cavity. The frame body is provided with a groove connected to the positioning cavity. The first buffer member is installed in the groove and connected to the liquid crystal glass.

9. The backlight module according to claim 8, characterized in that: The backlight module further includes a second buffer installed in the positioning cavity, wherein the second buffer and the first buffer are respectively arranged on opposite sides of the liquid crystal glass; and / or, The backlight module further comprises a light bar, which is mounted on the back plate and passes through the reflective sheet.

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

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