Backlight module and display device

Abstract

The utility model belongs to the technical field of display, and discloses a backlight module and a display device.The backlight module comprises a lamp strip and a back plate, the lamp strip comprises LED lamps and an FPC board, the FPC board comprises a circuit mainboard and an extension plate, the LED lamps are electrically connected to the circuit mainboard, the back plate comprises a bottom plate and a plurality of side plates, and the side plates are arranged on the bottom plate. A containing space used for containing the optical film and the light guide plate is jointly defined by the bottom plate and the side plates, any one of the side plates is provided with a containing through hole, the circuit mainboard is bonded to the outer sides, away from the containing space, of the side plates, the LED lamps are inserted into the corresponding containing through holes, and the extension plate is bonded to the optical film after being bent. The LED lamp is inserted into the containing through hole, so that the LED lamp and the back plate are overlapped in space, the thickness after the side plate and the lamp strip are overlapped is shortened, the design requirement of a narrow frame is met, the extension plate is bonded to the optical film, fixing of the optical film is achieved, the assembling efficiency is improved, and manpower and working hours are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially, relate to a backlight unit and display device. BACKGROUND

[0002] The prior art backlight module includes backboard, reflection plate, light guide plate, optical film, light bar and other components, the current backlight light source light bar is straight strip type, only as light emitting component, no other function, and usually fixed in the inside of backboard.

[0003] Light bar usually includes FPC and multiple LED lamps, multiple LED lamps are arranged on FPC along the length direction of FPC, and FPC is attached to the inner side wall of backboard by adhesive. Since FPC and LED lamps connected on FPC all have thickness, and light bar is located on the inner side wall of backboard, the thickness of backboard plus the thickness of light bar, resulting in the thickness of the frame being too thick, which cannot meet the design requirements of narrow frame, and the adhesive tape for fixing optical film is attached by artificial, not only waste manpower and working hours, but also prone to poor attachment and other problems.

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

[0005] The utility model aims at providing a backlight module and display device, which has small frame thickness and can more easily meet the design requirements of narrow frame.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] On the one hand, a backlight module is provided, which comprises:

[0008] A lamp strip comprises multiple LED lamps and an FPC board, the FPC board comprises a circuit mainboard and an extension plate connected thereto, and the multiple LED lamps are arranged on the circuit mainboard.

[0009] A backboard comprises a bottom plate and multiple side plates erected on the bottom plate, the bottom plate and the multiple side plates jointly enclose a containing space, a light guide plate and an optical film arranged on the light guide plate are contained in the containing space, at least one of the side plates is provided with a receiving through hole in communication with the containing space and corresponding to the multiple LED lamps, the circuit mainboard is arranged on the outer side of the side plate provided with the receiving through hole and away from the containing space, the LED lamps are arranged in the corresponding receiving through holes, and the extension plate is bent and abuts against the side of the side plate provided with the receiving through hole and away from the bottom plate, and is bonded to the optical film.

[0010] Optionally, a plurality of bending grooves are arranged at the connection between the circuit mainboard and the extension plate.

[0011] Optionally, the side of the side plate away from the bottom plate, on which the accommodating through hole is arranged, is further provided with a plurality of limiting protrusions, the plurality of limiting protrusions correspond to the plurality of bending grooves one by one, and the limiting protrusions are inserted into the bending grooves.

[0012] Optionally, the backlight module further comprises a heat dissipation adhesive sheet, and the heat dissipation adhesive sheet comprises a first adhesive segment, and the first adhesive segment is adhered to the side of the circuit mainboard away from the LED lamp.

[0013] Optionally, the heat dissipation adhesive sheet further comprises a second adhesive segment, and the second adhesive segment is adhered to the outer side of the bottom plate away from the accommodating space.

[0014] Optionally, the backlight module further comprises a first fixing adhesive sheet, the first fixing adhesive sheet comprises an adhesive sheet main body, the side of the circuit mainboard facing the side plate is provided with a first connecting area, and the first connecting area is provided with the adhesive sheet main body adhered to the side plate.

[0015] Optionally, the first fixing adhesive sheet further comprises a plurality of adhesive sheet branches, the side of the circuit mainboard facing the side plate is provided with a plurality of second connecting areas, the second connecting areas are located on both sides of the LED lamp along the length direction, and the second connecting areas are provided with the adhesive sheet branches adhered to the side plate.

[0016] Optionally, the backlight module further comprises a second fixing adhesive sheet, the second fixing adhesive sheet is arranged on the side of the extension plate facing the optical film sheet, and the second fixing adhesive sheet is in a stepped type.

[0017] Optionally, the backlight module further comprises a middle frame, the middle frame comprises a first fixing plate and a second fixing plate, the first fixing plate is arranged on the side of the circuit mainboard away from the side plate, the second fixing plate is arranged on the side of the extension plate away from the light guide plate, and the side of the second fixing plate away from the first fixing plate is provided with a avoiding inclined surface.

[0018] In another aspect, a display module is provided, and the display module comprises the backlight module according to any one of the above.

[0019] The backlight module has the following beneficial effects:

[0020] The utility model provides a kind of backlight module, which connects the circuit mainboard of FPC board to the outside of the side plate away from the accommodating space, and forms a receiving through hole corresponding to the plurality of LED lamps on the side plate, so that the LED lamp and the back plate overlap in space, thereby shortening the thickness of the side plate and the lamp strip after superposition, meeting the design requirements of narrow frame, and also setting an extension plate on the FPC board, and making the extension plate abut on the side of the side plate away from the bottom plate after bending, and adhering to the optical film, so that the FPC board can also be used to fix the optical film, compared with the additional adhesive tape for fixing the optical film, the structure is simplified, the assembly efficiency is improved, and the manpower and working hours are reduced.

[0021] The utility model also provides a kind of display device, which reduces the overall size, reduces the manufacturing cost and improves the quality of finished products by using the backlight module described above. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure sectional view of the backlight module provided by the utility model;

[0023] Figure 2 It is the structure schematic view of FPC board in the backlight module provided by the utility model;

[0024] Figure 3 It is the structure schematic view of back plate in the backlight module provided by the utility model;

[0025] Figure 4 It is Figure 3 The structure enlarged view of part A in it;

[0026] Figure 5 It is the structure schematic view of the first fixed film in the backlight module provided by the utility model;

[0027] Figure 6 It is the structure schematic view of the adhesive position of the first fixed film and the second fixed film in the backlight module provided by the utility model;

[0028] Figure 7 It is the structure schematic view of the second fixed film and the optical film on the light guide plate after adhering in the backlight module provided by the utility model.

[0029] In the figure:

[0030] 100, light guide plate; 200, optical film;

[0031] 1, lamp strip; 11, LED lamp; 12, FPC board; 121, circuit mainboard; 122, extension plate; 123, bending through slot;

[0032] 2, back plate; 21, bottom plate; 22, side plate; 221, containing through hole; 222, limiting protrusion; 23, containing space; 24, round corner;

[0033] 3, heat dissipation sheet; 31, first bonding section; 32, second bonding section; 33, circular arc section;

[0034] 4, first fixed sheet; 41, sheet main body; 42, sheet branch;

[0035] 5, second fixed sheet;

[0036] 6, middle frame; 61, first fixed plate; 62, second fixed plate; 63, avoiding inclined surface. DETAILED DESCRIPTION

[0037] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0038] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present embodiment, the terms "upper", "lower", "right", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0041] Since the lamp strip is currently arranged on the inner side wall of the back plate, the thickness of the frame is too thick, which cannot meet the design requirement of narrow frame, and the adhesive tape for fixing the optical film needs to be manually attached separately, which not only wastes manpower and working hours, but also is prone to poor attachment and other problems, therefore, in order to reduce the thickness of the frame and reduce manpower and working hours, the present embodiment provides a backlight module.

[0042] Figure 1 is a structural section view of the backlight module provided by the present application; Figure 2 is a structural schematic view of the FPC plate 12 in the backlight module provided by the present application; Figure 3 is a structural schematic view of the back plate 2 in the backlight module provided by the present application; Figure 4 is Figure 3 is a structural enlarged view of part A in the backlight module; as shown in Figures 1 to 4 The backlight module includes a lamp strip 1 and a back plate 2, the lamp strip 1 includes a plurality of LED lamps 11 and an FPC plate 12, the FPC plate 12 includes a circuit main plate 121 and an extension plate 122 connected together, the plurality of LED lamps 11 are arranged on the circuit main plate 121, the back plate 2 includes a bottom plate 21 and a plurality of side plates 22 erected on the bottom plate 21, the bottom plate 21 and the plurality of side plates 22 together enclose a containing space 23, the containing space 23 contains a light guide plate 100 and an optical film 200 arranged on the light guide plate 100, at least one of the side plates 22 is provided with a receiving through hole 221 in communication with the containing space 23 and corresponding to the plurality of LED lamps 11, the circuit main plate 121 is arranged on the outer side of the side plate 22 provided with the receiving through hole 221 and away from the containing space 23, the LED lamp 11 penetrates into the corresponding receiving through hole 221, and the extension plate 122 is abutted to the side of the side plate 22 provided with the receiving through hole 221 and away from the bottom plate 21 after being bent, and is bonded to the optical film 200.

[0043] The backlight module connects the circuit main plate 121 of the FPC plate 12 to the outer side of the side plate 22 away from the accommodating space 23, and forms a plurality of accommodating through holes 221 on the side plate 22 corresponding to the plurality of LED lamps 11, so that the LED lamp 11 and the back plate 2 overlap in space, thereby shortening the thickness of the side plate 22 after being overlapped with the lamp strip 1, meeting the design requirement of narrow frame, and the extension plate 122 is arranged on the FPC plate 12, and the extension plate 122 is abutted to the side of the side plate 22 away from the bottom plate 21 after being bent, and is bonded to the optical film 200, so that the FPC plate 12 can also be used to fix the optical film 200, compared with the additional adhesive tape for fixing the optical film 200, the structure is simplified, the assembly efficiency is improved, and the manpower and working hours are reduced.

[0044] In the embodiment, among the circuit main plate 121 and the extension plate 122 constituting the FPC plate 12, the circuit main plate 121 is provided with a circuit, and the extension plate 122 is not provided with a circuit, and is only an extension of the base material of the FPC plate 12, and after being bent, is perpendicular to the circuit main plate 121, so as to constitute an L-shaped FPC plate 12.

[0045] Optionally, as shown in Figure 2 A plurality of bending through grooves 123 are formed at the connection between the circuit main plate 121 and the extension plate 122. By arranging a plurality of intermittent bending through grooves 123 between the circuit main plate 121 and the extension plate 122, the base material between the circuit main plate 121 and the extension plate 122 is reduced, so as to reduce the resistance when the extension plate 122 is bent.

[0046] The number of the bending through grooves 123 arranged between the circuit main plate 121 and the extension plate 122 can be freely set according to requirements, and in the embodiment, two spaced-apart bending through grooves 123 are arranged between the circuit main plate 121 and the extension plate 122.

[0047] Optionally, as shown in Figure 2 and Figure 4 The side of the side plate 22 away from the bottom plate 21, on which the accommodating through hole 221 is formed, is also provided with a plurality of limiting protrusions 222, the plurality of limiting protrusions 222 correspond to the plurality of bending through grooves 123, and the limiting protrusions 222 are inserted into the bending through grooves 123. By arranging the limiting protrusions 222 on the side plate 22 on which the accommodating through hole is formed, the FPC plate 12 and the side plate 22 of the back plate 2 are clamped after the limiting protrusions 222 are inserted into the bending through grooves 123, so as to ensure the accuracy of the relative position and the structural strength after connection.

[0048] In the embodiment, the length of the limiting protrusion 222 is less than the length of the bending through groove 123, so that the limiting protrusion 222 is easily inserted into the bending through groove 123.

[0049] Optionally, as shown in Figure 1 The backlight module further comprises a heat dissipation sheet 3, and the heat dissipation sheet 3 comprises a first bonding section 31 which is bonded to a side of the circuit mainboard 121 away from the LED lamp 11. By arranging the first bonding section 31 of the heat dissipation sheet 3 on the side of the circuit mainboard 121 away from the LED lamp 11, the heat dissipation effect of the circuit mainboard 121 is enhanced, and the temperature of the circuit mainboard 121 during operation is prevented from being too high, so that the circuit mainboard 121 is prevented from being damaged due to high temperature.

[0050] Further, as shown in Figure 1 The heat dissipation sheet 3 further comprises a second bonding section 32 which is bonded to the outer side of the bottom plate 21 away from the accommodating space 23. By bonding the second bonding section 32 of the heat dissipation sheet 3 to the outer side of the bottom plate 21 away from the accommodating space 23, the bonding area between the heat dissipation sheet 3 and the back plate 2 is increased, so that the bonding firmness of the heat dissipation sheet 3 is enhanced, and the heat dissipation sheet 3 is prevented from falling off due to insufficient bonding area.

[0051] In the embodiment, in addition, the first bonding section 31 and the adjacent second bonding section 32 are connected through a circular arc section 33, the bottom plate 21 and the side plate 22 erected on the bottom plate 21 are connected through a rounded corner 24, and part of the circular arc section 33 is arranged on the outer side of the rounded corner 24. By arranging the rounded corner 24 between the bottom plate 21 and the side plate 22 erected on the bottom plate 21, the edge formed after the connection between the bottom plate 21 and the side plate 22 is prevented from scratching the heat dissipation sheet 3, and by arranging the circular arc section 33 between the first bonding section 31 and the adjacent second bonding section 32, the heat dissipation sheet 3 is more closely attached to the back plate 2.

[0052] Optionally, Figure 5 is a structural schematic view of a first fixed sheet 4 in the backlight module provided by the utility model; Figure 6 is a structural schematic view of a bonding position of the first fixed sheet 4 and a second fixed sheet 5 in the backlight module provided by the utility model, as shown in Figure 5 and Figure 6 The backlight module further comprises the first fixed sheet 4, and the first fixed sheet 4 comprises a sheet main body 41. A first connecting area is arranged on a side of the circuit mainboard 121 facing the side plate 22, and the sheet main body 41 is bonded to the first connecting area. By arranging the sheet main body 41 of the first fixed sheet 4 on the side of the circuit mainboard 121 provided with the LED lamp 11, the circuit mainboard 121 is bonded to the side plate 22, so that the connection between the circuit mainboard 121 and the side plate 22 is realized.

[0053] Further, as shown in Figure 5 and Figure 6As shown, the first fixed film 4 further comprises a plurality of film branches 42, and the circuit main plate 121 is provided with a plurality of second connecting areas on one side of the side plate 22, the second connecting areas are located on both sides of the LED lamp 11 along the length direction, and the second connecting areas are provided with the film branches 42 which are bonded with the side plate 22. By arranging the film branches 42 between the adjacent two LED lamps 11, the area covered by the first fixed film 4 on the circuit main plate 121 is expanded, the bonding area of the circuit main plate 121 and the side plate 22 is increased, and thus the bonding strength of the circuit main plate 121 and the side plate 22 is enhanced.

[0054] Optionally, Figure 7 is a structure schematic diagram of the second fixed film 5 and the optical film 200 arranged on the light guide plate 100 after bonding, provided by the utility model, as shown in Figure 7 As shown, the backlight module further comprises a second fixed film 5, the second fixed film 5 is arranged on one side of the extension plate 122 facing the optical film 200, and the second fixed film 5 is of a stepped type. Since the optical film 200 is composed of a plurality of film layers, and the shapes of different film layers are different, the optical film 200 has ups and downs, and therefore the second fixed film 5 of the stepped type is arranged on one side of the extension plate 122 facing the optical film 200, so that the extension plate 122 is better matched with the optical film 200, and the flatness of the extension plate 122 after bonding is ensured.

[0055] Optionally, the backlight module further comprises a middle frame 6, the middle frame 6 comprises a first fixed plate 61 and a second fixed plate 62, the first fixed plate 61 is arranged on one side of the circuit main plate 121 away from the side plate 22, the second fixed plate 62 is arranged on one side of the extension plate 122 away from the light guide plate 100, and the second fixed plate 62 is provided with a relief inclined surface 63 on one side away from the first fixed plate 61. By using the middle frame 6 to protect and fix the FPC plate 12 arranged on the outer side of the back plate 2, and by arranging the relief inclined surface 63 on one side of the second fixed plate 62 away from the first fixed plate 61, the area of the second fixed plate 62 shielding the light guide plate 100 is reduced, and the area for light emission is increased.

[0056] Optionally, as shown in Figure 1 The accommodating through hole 221 is in clearance fit with the LED lamp 11. By making the accommodating through hole 221 in clearance fit with the LED lamp 11, the LED lamp 11 can be conveniently and smoothly inserted into the accommodating through hole 221. In the embodiment, the cross-sectional shape of the accommodating through hole 221 can be the same as or different from the shape of the LED lamp 11, as long as the area of the accommodating through hole 221 is greater than that of the LED lamp 11, and the LED lamp 11 can be smoothly inserted into the accommodating through hole 221.

[0057] In the embodiment, a display device is also provided, which comprises the backlight module.

[0058] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A backlight module, characterized in that, The backlight module comprises: A lamp strip (1) comprising a plurality of LED lamps (11) and an FPC board (12), the FPC board (12) comprising a circuit main board (121) and an extension board (122) connected together, and the plurality of LED lamps (11) being arranged on the circuit main board (121); A back plate (2) comprising a bottom plate (21) and a plurality of side plates (22) erected on the bottom plate (21), the bottom plate (21) and the plurality of side plates (22) together enclosing a containing space (23), the containing space (23) containing a light guide plate (100) and an optical film (200) arranged on the light guide plate (100), at least one of the side plates (22) being provided with a receiving through hole (221) corresponding to the plurality of LED lamps (11) and communicating with the containing space (23), the circuit main board (121) being arranged on the outer side of the side plate (22) provided with the receiving through hole (221) and facing away from the containing space (23), the LED lamp (11) being arranged in the corresponding receiving through hole (221), and the extension board (122) being bent and abutting against the side of the side plate (22) provided with the receiving through hole (221) and facing away from the bottom plate (21) and being bonded to the optical film (200).

2. The backlight module of claim 1, wherein, A plurality of bending grooves (123) are arranged at the connection between the circuit main board (121) and the extension board (122).

3. The backlight module of claim 2, wherein, The side of the side plate (22) provided with the receiving through hole (221) and facing away from the bottom plate (21) is further provided with a plurality of limiting protrusions (222), the plurality of limiting protrusions (222) corresponding to the plurality of bending grooves (123), and the limiting protrusions (222) being arranged in the bending grooves (123).

4. The backlight module of claim 1, wherein, The backlight module further comprises a heat dissipation adhesive sheet (3), the heat dissipation adhesive sheet (3) comprising a first bonding section (31) bonded to the side of the circuit main board (121) facing away from the LED lamp (11).

5. The backlight module of claim 4, wherein, The heat dissipation adhesive sheet (3) further comprises a second bonding section (32) bonded to the outer side of the bottom plate (21) facing away from the containing space (23).

6. The backlight module of claim 1, wherein, The backlight module further comprises a first fixing adhesive sheet (4), the first fixing adhesive sheet (4) comprising an adhesive sheet main body (41), the side of the circuit main board (121) facing the side plate (22) being provided with a first connecting area, and the first connecting area being provided with the adhesive sheet main body (41) bonded to the side plate (22).

7. The backlight module of claim 6, wherein, The first fixing adhesive sheet (4) further comprises a plurality of adhesive sheet branches (42), the side of the circuit main board (121) facing the side plate (22) being provided with a plurality of second connecting areas, the second connecting areas being located on both sides of the LED lamp (11) along the length direction, and the second connecting areas being provided with the adhesive sheet branches (42) bonded to the side plate (22).

8. The backlight module of claim 1, wherein, The backlight module further comprises a second fixing film (5) arranged on the side of the extension plate (122) facing the optical film (200), wherein the second fixing film (5) is in a stepped shape.

9. The backlight module of claim 1, wherein, The backlight module further comprises a middle frame (6) comprising a first fixing plate (61) and a second fixing plate (62), wherein the first fixing plate (61) is arranged on the side of the circuit main plate (121) away from the side plate (22), the second fixing plate (62) is arranged on the side of the extension plate (122) away from the light guide plate (100), and the side of the second fixing plate (62) away from the first fixing plate (61) is provided with a slope (63).

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

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