Backlight module and display equipment

Abstract

The backlight module comprises a middle frame, a liquid crystal screen, a backlight assembly, a back plate and at least one rubber mat, the liquid crystal screen comprises a liquid crystal panel, a PCB (printed circuit board) and a plurality of COF (chip on film) flat cables, the liquid crystal panel is fixed on the middle frame, one end of each COF flat cable is connected with the liquid crystal panel, and the other end of each COF flat cable is connected with the PCB; the backlight assembly comprises a diaphragm, a light guide plate and reflection paper which are sequentially stacked, and the diaphragm is arranged close to the liquid crystal panel; the back plate is fixed on the middle frame, a limiting groove is defined by the back plate and the middle frame, the side end of the backlight assembly is inserted into the limiting groove, and at least two blocking pieces are arranged on the back plate in a protruding mode; the rubber mat is installed on the back plate and located between the two adjacent blocking pieces, when the backlight module is in a side-in type, the rubber mat is located in the limiting groove, one end of the reflection paper is connected with the back plate, and the other end of the reflection paper is connected with the rubber mat; when the backlight module is in a direct type, the rubber mat is located outside the limiting groove, and the PCB is clamped and inserted on the rubber mat, so that the phenomenon that the backlight picture of the module is poor is improved.

Description

Technical Field

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

[0002] Backlight modules are mainly divided into edge-lit and direct-lit types. Edge-lit backlight modules are backlights created by placing linear or point-shaped light sources on the side of a specially designed light guide plate. The light guide plate utilizes the dot distribution on the bottom of the light-guiding acrylic plate to disrupt light interference, uniformly converting the linear light source into a surface light source. Its function is to guide the direction of light scattering, making the light distribution more uniform and eliminating the shadow of the reflection point from the front. This is used to increase the brightness of the LCD panel and ensure the uniformity of the LCD panel's brightness. Direct-lit backlight modules place the light source at the bottom of the light guide plate. After emitting light from the light source, it passes through the reflective paper at the bottom and then evenly exits through the light guide plate and diaphragm on the surface.

[0003] Silicone pads are required in both edge-lit and direct-lit backlight modules. There are two main methods for attaching silicone pads:

[0004] Implementation method 1: The attachment operation is performed by stamping and adding engraved line markings on the back panel. However, when the assembly line moves too fast or the silicone pad design shape is too small, the operator may exceed the engraved line marking area during the attachment process of the silicone pad, thereby affecting the quality and standardization of the silicone pad attachment operation, resulting in undesirable problems such as black shadows and stripes on the module screen.

[0005] Implementation method 2: The attachment operation is performed by bending the edge of the back panel and stamping the engraved line mark. However, when the assembly line moves too fast or the silicone pad is designed to be too small, the operator may attach the silicone pad beyond the engraved line mark area or too high during the process of attaching the silicone pad, resulting in defects such as black shadows and spots on the module screen. Utility Model Content

[0006] The purpose of the present utility model is to provide a backlight module and a display device to solve the technical problem that when attaching silicone pads to existing edge-entry backlight modules and direct-type backlight modules, when the assembly line moves too fast or the silicone pad design shape is too small, the silicone pad will exceed the engraved line marking area during the attachment process, thereby affecting the quality and standardization of the silicone pad attachment operation and causing black shadows and stripes on the module screen.

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

[0008] middle frame;

[0009] The LCD screen includes an LCD panel, a PCB, and several COF cables. The LCD panel is fixed to the middle frame. One end of the COF cable is connected to the LCD panel and the other end is connected to the PCB.

[0010] A backlight assembly, comprising a film, a light guide plate, and reflective paper stacked in sequence, wherein the film is disposed close to the liquid crystal panel;

[0011] a back plate fixed to the middle frame and enclosed with the middle frame to form a limiting groove, the side ends of the backlight assembly are inserted into the limiting groove, and the back plate is convexly provided with at least two blocking members;

[0012] At least one rubber pad is installed on the back panel and located between two adjacent blocking members. When the backlight module is a side-entry type, the rubber pad is located in the limiting groove, one end of the reflective paper is connected to the back panel, and the other end is connected to the rubber pad; when the backlight module is a direct-down type, the rubber pad is located outside the limiting groove, and the PCB board is inserted on the rubber pad.

[0013] Furthermore, the distance between the rubber pad and the adjacent blocking member is 0.2±0.05 mm.

[0014] Furthermore, when the backlight module is side-entry, the back panel includes a first side panel, a first support panel, and a first bent panel that bulges toward the side close to the backlight assembly. One end of the first support panel is vertically connected to the first side panel, and the other end is connected to the first bent panel. The first side panel is connected to the middle frame. The middle frame, the first side panel, and the first support panel together form the limiting groove. The blocking member is protruding on the inner wall of the limiting groove. The rubber pad is fixed to the first side panel and / or the first support panel. One end of the reflective paper is installed on the first bent panel, and the other end is installed on the rubber pad.

[0015] Furthermore, the rubber pad includes a first pad body and a second pad body protruding from the side of the first pad body, the distance between the top of the first pad body and the first support plate is greater than the distance between the top of the second pad body and the first support plate, one end of the reflective paper is installed on the first bending plate, and the other end is installed on the second pad body.

[0016] Furthermore, a baffle for limiting the movement of the rubber pad is protruded from the middle frame on one side facing the first support plate, and the baffle is spaced apart from the rubber pad.

[0017] Furthermore, the backlight module also includes a first light source located in the limiting groove, the first light source is fixed to the first side panel and / or the first support plate, the first light source is arranged corresponding to the backlight assembly, and the first light source is electrically connected to the PCB board.

[0018] Furthermore, when the backlight module is of a direct-lit type, the back plate is provided with a groove, the blocking member is provided on the inner wall of the groove, and the rubber pad is installed in the groove.

[0019] Furthermore, the back panel includes a second side panel, a second support panel, and a second bent panel that bulges toward the side away from the backlight assembly, one end of the second support panel is vertically connected to the second side panel, and the other end is connected to the second bent panel, the second side panel and the second support panel are both connected to the middle frame, the second side panel and the middle frame enclose the limiting groove, the groove is spaced apart from the limiting groove, and the blocking member is protruded from the second bent panel.

[0020] Furthermore, the backlight module also includes a second light source, one end of which is installed on the second bending plate, and the other end passes through the reflective paper and is arranged corresponding to the light guide plate. The second light source is electrically connected to the PCB board.

[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 are:

[0023] The utility model adds at least two blocking parts on the basis of the original structure of the back panel, and the rubber pad is fixed between two adjacent blocking parts, limiting the movement of the rubber pad in two degrees of freedom in the direction of the connection line of the two blocking parts. In the process of attaching the rubber pad, when the assembly line moves too fast or the design shape of the rubber pad is too small, this structural design can reduce the probability of the rubber pad exceeding the engraved line marking area after bonding, improve the quality and standardization of the rubber pad attachment operation, thereby improving the poor backlight picture phenomenon of the module due to poor rubber pad attachment. It is not only highly applicable, but also can effectively improve operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 A schematic diagram of the structure of the edge-lit backlight module provided by an embodiment of the present invention, excluding the middle frame and the LCD screen;

[0026] Figure 3A partial cross-sectional view of the back panel of the edge-lit backlight module provided by an embodiment of the present utility model;

[0027] Figure 4 A partial cross-sectional view of the middle frame of the edge-lit backlight module provided by an embodiment of the present utility model;

[0028] Figure 5 A schematic structural diagram of a rubber pad of an edge-lit backlight module provided by an embodiment of the present utility model;

[0029] Figure 6 A partial cross-sectional view of a direct-lit backlight module provided by an embodiment of the present utility model;

[0030] Figure 7 A schematic diagram of the structure of a direct-lit backlight module provided by an embodiment of the present invention with the PCB removed;

[0031] Figure 8 A partial cross-sectional view of the back panel of the edge-lit backlight module provided by an embodiment of the present utility model;

[0032] Figure 9 A partial cross-sectional view of the middle frame of the edge-lit backlight module provided by an embodiment of the present invention.

[0033] In the picture:

[0034] 10. Middle frame; 11. Baffle; 12. First side arm; 13. First frame body; 14. Slot; 15. Second side arm; 16. Second frame body; 161. Positioning slot; 17. Support plate; 20. LCD screen; 21. LCD panel; 22. PCB board; 30. Backlight assembly; 31. Diaphragm; 32. Light guide plate; 33. Reflective paper; 40. Back plate; 41. Blocking member; 42. First side plate; 43. First support plate; 44. First bending plate; 45. Groove; 46. Second side plate; 47. Second support plate; 48. Second bending plate; 50. Rubber pad; 51. First pad body; 52. Second pad body; 53. Card slot; 60. Limiting slot. DETAILED DESCRIPTION

[0035] Below, the present invention is further described 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 new embodiments.

[0036] See also Figures 1 to 6 As shown, an embodiment of the present invention discloses a backlight module, which can be applied to 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.

[0037] The backlight module includes a middle frame 10, an LCD screen 20, a backlight assembly 30, a back plate 40 and at least one rubber pad 50. The LCD screen 20 includes a liquid crystal panel 21, a PCB board 22 and several COF cables. The liquid crystal panel 21 is fixed on the middle frame 10. One end of the COF cable is connected to the liquid crystal panel 21 and the other end is connected to the PCB board 22. The liquid crystal panel 21 is electrically connected to the PCB board 22 through the COF cable. The backlight assembly 30 includes a diaphragm 31, a light guide plate 32 and a reflective paper 33 stacked in sequence. The diaphragm 31, the light guide plate 32 and the reflective paper 33 can be bonded and fixed to each other by glue. The diaphragm 31 is arranged close to the liquid crystal panel 21.

[0038] The back panel 40 is fixed to the middle frame 10 and encloses the middle frame 10 to form a laterally arranged limiting groove 60. The side end of the backlight assembly 30 is inserted into the limiting groove 60. The back panel 40 is provided with at least two blocking members 41. The blocking members 41 are arranged on the back panel 40 in groups of two. The rubber pad 50 is installed on the back panel 40 and is located between two adjacent blocking members 41, limiting the movement of the rubber pad 50 in two degrees of freedom in the direction of the connecting line of the two blocking members 41. The backlight module has two structural forms. When the backlight module is a side-entry backlight module, the rubber pad 50 and the blocking member 41 are both located in the limiting groove 60. One end of the reflective paper 33 is connected to the back plate 40 and the other end is connected to the rubber pad 50, and the PCB board 22 is fixed on the back plate 40; when the backlight module is a direct-type backlight module, the rubber pad 50 and the blocking member 41 are both located outside the limit groove 60, the reflective paper 33 is only connected to the back plate 40, and the PCB board 22 is inserted into the rubber pad 50. The backlight module can reduce the probability of the rubber pad 50 exceeding the engraved line marking area after bonding, improve the quality and standardization of the rubber pad 50 attachment operation, thereby improving the poor module backlight image caused by poor attachment of the rubber pad 50. The rubber pad 50 can be made of silicone material.

[0039] The blocking member 41 can be a cylindrical convex hull or a trapezoidal boss, etc. The specific structure of the blocking member 41 can be selected according to actual needs. This embodiment adopts the method of adding relevant cylindrical convex hulls, trapezoidal bosses and other shapes to the original structure of the back panel 40. It does not require new limiting materials and will not cause adverse effects on the original structural assembly, so as to improve the poor adhesion of the rubber pad 50 on the module, such as climbing up the wall and exceeding the engraving line, thereby further improving the poor backlight image of the module caused by poor adhesion of the rubber pad 50. It is not only highly applicable, but also can effectively improve the working efficiency.

[0040] The blocking member 41 can be used to limit two degrees of freedom in a certain direction, converting the N degrees of freedom in the original direction of the adhesive pad 50 to the degrees of freedom in N-2 directions, which not only ensures the high efficiency and stable quality yield of the adhesive pad 50, but also avoids the risks of module optical and electronic defects, temperature rise defects, etc. caused by poor operation of the adhesive pad 50, thereby ensuring the stability of product quality.

[0041] In some embodiments, the spacing between the rubber pad 50 and the adjacent blocking members 41 is 0.2±0.05 mm, and the rubber pad 50 and the two blocking members 41 are spaced apart, which can effectively limit the freedom of the rubber pad 50 in the direction formed by the two blocking members 41, so that the attachment operation can be performed quickly and effectively within the area defined by the two blocking members 41.

[0042] Backlight module structure one:

[0043] When the backlight module is an edge-entry backlight module, the back panel 40 includes a first side panel 42, a first support panel 43 and a first bent panel 44 that bulges toward the side close to the backlight assembly 30. One end of the first support panel 43 is vertically connected to the first side panel 42 and the other end is connected to the first bent panel 44. The first side panel 42 is connected to the middle frame 10. The middle frame 10, the first side panel 42 and the first support panel 43 together form the limiting groove 60. The blocking member 41 is protruding from the inner wall of the limiting groove 60. The blocking member 41 is provided on the first side panel 42. The rubber pad 50 is fixed to the first side panel 42 and / or the first support panel 43 by glue. One end of the reflective paper 33 is installed on the first bent panel 44 and the other end is installed on the rubber pad 50. The blocking member 41 is preferably a cylindrical convex bulge.

[0044] In this embodiment, the rubber pad 50 includes a first pad body 51 and a second pad body 52 protruding from one side surface of the first pad body 51. The second pad body 52 is located on the side of the first pad body 51 away from the blocking member 41. The distance between the top of the first pad body 51 and the first support plate 43 is greater than the distance between the top of the second pad body 52 and the first support plate 43. A height difference is formed between the first pad body 51 and the second pad body 52. ​​One end of the reflective paper 33 is installed on the raised first bending plate 44 and the other end is installed on the second pad body 52. ​​The rubber pad 50 supports the risk of the backlight assembly 30 sagging through the second pad body 52. ​​The cylindrical bulge can effectively prevent the rubber pad 50 from moving and deviating during transportation or in long-term high temperature, high humidity and other environments, thereby ensuring the stability of the quality of the backlight module.

[0045] In some embodiments, a baffle 11 is protruded from the side of the middle frame 10 facing the first support plate 43. The baffle 11 is spaced apart from the rubber pad 50 to prevent the rubber pad 50 from loosening. The baffle 11 can limit the movement of the rubber pad 50 in the vertical direction, effectively limiting the freedom of movement of the rubber pad 50 in the vertical direction, and preventing the rubber pad 50 from moving upward during transportation or in long-term high temperature, high humidity and other environments, causing optical shadows and other undesirable patterns.

[0046] The middle frame 10 includes a first side arm 12, a first frame body 13 and the baffle 11. The first side arm 12 is connected to one end of the first frame body 13, and the baffle 11 is connected to the middle of the first frame body 13. The first side arm 12, the baffle 11 and part of the first frame body 13 form a slot 14. The first side plate 42 is inserted into the slot 14 to position the back plate 40 on the middle frame 10. The liquid crystal panel 21 and the diaphragm 31 are respectively installed on the two back sides of the middle frame 10.

[0047] The backlight module also includes a first light source located in the limiting groove 60, the first light source is fixed to the first side plate 42 and / or the first support plate 43, the first light source and the rubber pad 50 are staggered, the first light source is corresponding to the light guide plate 32 in the backlight assembly 30, and the first light source is electrically connected to the PCB board 22, such as Figure 1 As shown in the direction, the first light source emits light from the side of the light guide plate 32. Part of the light will propagate upward, and the other part will propagate downward. The reflective paper 33 will deflect the downward light and propagate upward to form a dot matrix light. The diaphragm 31 will correct the propagation direction of the light and convert the dot matrix light into a plane array light. Finally, the light enters the liquid crystal panel 21, and the liquid crystal panel 21 is powered on to produce a picture.

[0048] Backlight module structure two:

[0049] Please see further Figures 6 to 9 As shown, when the backlight module is a direct-type backlight module, the back panel 40 is provided with a groove 45, the blocking member 41 is provided on the inner wall of the groove 45, the rubber pad 50 is a hollow structure, the shape of the rubber pad 50 matches the shape of the groove 45, the rubber pad 50 is installed in the groove 45 and is located between the two blocking members 41 to fix the rubber pad 50, and the blocking member 41 is preferably a trapezoidal boss.

[0050] In this embodiment, the back panel 40 includes a second side panel 46, a second support panel 47, and a second bent panel 48 that bulges toward the side away from the backlight assembly 30. One end of the second support panel 47 is vertically connected to the second side panel 46, and the other end is connected to the second bent panel 48. The second side panel 46 and the second support panel 47 are both connected to the middle frame 10. The second side panel 46 and the middle frame 10 are combined to form the limiting groove 60. The groove 45 and the limiting groove 60 are spaced apart. The groove 45 and the limiting groove 60 are separated by the back panel 40. The blocking member 41 is protruded on the second bent panel 48, and the rubber pad 50 is simultaneously in contact with the second side panel 46, the second support panel 47, and the second bent panel 48.

[0051] In some embodiments, a slot 53 is provided at one end of the rubber pad 50 away from the second support plate 47 , and the PCB board 22 is snapped into the slot 53 so that the PCB board 22 can be quickly removed during subsequent maintenance.

[0052] The middle frame 10 includes a second side arm 15, a second frame body 16 and a support plate 17. The second frame body 16 is connected to one side of the second side arm 15, and the support plate 17 is connected to the bottom of the second side arm 15. The second frame body 16 and the second side arm 15 form a step. The top of the second frame body 16 is provided with a positioning groove 161 with an "L"-shaped cross-section. The backlight assembly 30 is fixed in the positioning groove 161. The second side plate 46 is connected to the second side arm 15. One end of the second support plate 47 is fixed to the second frame body 16 and the other end is fixed to the reflective paper 33 to position the back plate 40 on the middle frame 10. The liquid crystal panel 21 and the diaphragm 31 are respectively located on two opposite sides of the middle frame 10.

[0053] The backlight module also includes a second light source. The end of the reflective paper 33 is connected to the second support plate 47, and the middle of the reflective paper 33 is connected to the second bending plate 48. One end of the second light source is mounted on the second bending plate 48, and the other end passes through the reflective paper 33 and is arranged corresponding to the light guide plate 32. The second light source is electrically connected to the PCB board 22. Figure 6 As shown in the direction in the figure, the second light source injects light into the light guide plate 32, part of the light will propagate downward, and the other part of the light will propagate upward. The reflective paper 33 will deflect the upward light and propagate downward to form a dot matrix light. The diaphragm 31 will correct the propagation direction of the light and convert the dot matrix light into a plane array light. Finally, the light enters the liquid crystal panel 21, and the liquid crystal panel 21 is powered on to produce a picture.

[0054] In this embodiment, if the rubber pad 50 is displaced or attached too high or too low, it may interfere with the electronic components on the PCB board 22, and the signal may be interfered with by other components, resulting in EMI or EMC problems. If the PCB board 22 is moved to a high-temperature component, it will cause abnormal temperature of the IC on the COF cable. The rubber pad 50 is limited by the trapezoidal boss, which can effectively avoid the occurrence of electronic problems and temperature problems.

[0055] The utility model also discloses a display device, comprising the backlight module as described above.

[0056] In summary, the present invention adds at least two blocking members 41 on the basis of the original structure of the back panel 40, and the rubber pad 50 is fixed between two adjacent blocking members 41, limiting the movement of the rubber pad 50 in two degrees of freedom in the direction of the connection line between the two blocking members 41. In the process of attaching the rubber pad 50, when the assembly line moves too fast or the design shape of the rubber pad 50 is too small, this structural design can reduce the probability of the rubber pad 50 exceeding the engraved line marking area after bonding, improve the quality and standardization of the rubber pad 50 attachment operation, thereby improving the poor backlight image phenomenon of the module caused by poor attachment of the rubber pad 50. It is not only highly applicable, but also can effectively improve operating efficiency.

[0057] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A backlight module, characterized in that: include: middle frame; The LCD screen includes an LCD panel, a PCB, and several COF cables. The LCD panel is fixed to the middle frame. One end of the COF cable is connected to the LCD panel and the other end is connected to the PCB. A backlight assembly comprising a film, a light guide plate and a reflective paper stacked in sequence, wherein the film is arranged close to the liquid crystal panel; a back plate fixed to the middle frame and enclosed with the middle frame to form a limiting groove, the side ends of the backlight assembly are inserted into the limiting groove, and the back plate is convexly provided with at least two blocking members; At least one rubber pad is installed on the back panel and located between two adjacent blocking members. When the backlight module is a side-entry type, the rubber pad is located in the limiting groove, one end of the reflective paper is connected to the back panel, and the other end is connected to the rubber pad; when the backlight module is a direct-down type, the rubber pad is located outside the limiting groove, and the PCB board is inserted on the rubber pad.

2. The backlight module according to claim 1, wherein: The distance between the rubber pad and the adjacent blocking member is 0.2±0.05 mm.

3. The backlight module according to claim 1, wherein: When the backlight module is side-entry, the back panel includes a first side panel, a first support panel, and a first bent panel that bulges toward the side close to the backlight assembly. One end of the first support panel is vertically connected to the first side panel, and the other end is connected to the first bent panel. The first side panel is connected to the middle frame. The middle frame, the first side panel, and the first support panel together form the limiting groove. The blocking member is protruding on the inner wall of the limiting groove. The rubber pad is fixed to the first side panel and / or the first support panel. One end of the reflective paper is installed on the first bent panel, and the other end is installed on the rubber pad.

4. The backlight module according to claim 3, wherein: The rubber pad includes a first pad body and a second pad body protruding from the side of the first pad body. The distance between the top of the first pad body and the first support plate is greater than the distance between the top of the second pad body and the first support plate. One end of the reflective paper is installed on the first bending plate and the other end is installed on the second pad body.

5. The backlight module according to claim 3, wherein: A baffle for limiting the movement of the rubber pad is protruded from a side of the middle frame facing the first support plate, and the baffle is spaced apart from the rubber pad.

6. The backlight module according to claim 3, wherein: The backlight module also includes a first light source located in the limiting groove, the first light source is fixed to the first side panel and / or the first support plate, the first light source is arranged corresponding to the backlight assembly, and the first light source is electrically connected to the PCB board.

7. The backlight module according to claim 1, wherein: When the backlight module is of a direct-down type, the back plate is provided with a groove, the blocking member is provided on the inner wall of the groove, and the rubber pad is installed in the groove.

8. The backlight module according to claim 7, wherein: The back panel includes a second side panel, a second support panel, and a second bent panel that bulges toward a side away from the backlight assembly. One end of the second support panel is vertically connected to the second side panel, and the other end is connected to the second bent panel. Both the second side panel and the second support panel are connected to the middle frame. The second side panel and the middle frame enclose the limiting groove. The groove is spaced apart from the limiting groove, and the blocking member is protruded from the second bent panel.

9. The backlight module according to claim 8, wherein: The backlight module further includes a second light source, one end of which is mounted on the second bending plate, the other end of which passes through the reflective paper and is arranged corresponding to the light guide plate, and the second light source is electrically connected to the PCB board.

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

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