CN219497256U - Backlight module, module light bar cutting tool and display device - Google Patents

Abstract

The utility model provides a backlight module, a module light bar cutting tool and a display device, wherein the backlight module comprises a light source assembly, the light source assembly comprises a first light bar, the first light bar comprises a substrate and a plurality of LEDs arranged on the substrate, the substrate comprises two bar-shaped arm parts and a connecting part for connecting the two arm parts, and a connector electrically connected with the LEDs arranged on the arm parts is arranged at the connecting part. Based on the technical scheme of the utility model, the number of cables and joints is greatly reduced, so that the assembly efficiency can be effectively improved, the manpower and materials required by assembly are reduced, and meanwhile, the overall joint reliability risk can be reduced due to the reduction of the number of the joints.

Description

Backlight module, module light bar cutting tool and display device

Technical Field

The utility model relates to the technical field of display, in particular to a backlight module, a module light bar cutting tool and a display device.

Background

Currently MINI LED TV has entered the light bar era, the light bar has widely replaced the past light panel or fish-fork board, and the area of the corresponding PCB board is also continuously reduced, which is beneficial to cost control. However, the light bar has a problem that if the light bar is used in the backlight module of the same specification instead of the light panel or the harpoon plate, a larger number of light bars are required, for example, 36 light bars are required in the backlight module of the 65-inch display product. The number of light bars increases, as does the number of corresponding connection lines, which leads to an increased risk of connection reliability and a reduced operational time.

In addition, in the current backlight module, the reflector plate is usually in a multi-piece spliced mode, wherein the bottom plate reflector plate and the surrounding slope reflector plates are mutually divided, and the bottom plate reflector plate is also divided into a plurality of parts, which results in more types and specifications of the reflector plates and is inconvenient for design and material preparation.

Therefore, in order to solve the above problems, the present utility model provides a backlight module, a module light bar cutting tool and a display device.

Disclosure of Invention

In order to solve the above problems in the existing backlight module, the utility model provides a backlight module, a module light bar cutting tool and a display device.

In a first aspect, the backlight module provided by the utility model comprises a light source assembly, wherein the light source assembly comprises a first light bar, the first light bar comprises a substrate and a plurality of LEDs arranged on the substrate, the substrate comprises two bar-shaped arm parts and a connecting part for connecting the two arm parts, and the connecting part is provided with a connector electrically connected with the LEDs arranged on the arm parts.

In one embodiment, the vertical distance a between the centerlines of the two arms, the width b of the arms, and the cutting minimum process spacing c satisfy: a=3b+3c.

In one embodiment, the dicing minimum process spacing c satisfies: c is more than or equal to 1mm and less than or equal to 2mm.

In one embodiment, the connecting portion has a width in the extending direction of the arm portion of 15 to 50mm.

In one embodiment, the connecting portion is located at an end position of the arm portion so that the base plate is U-shaped; or (b)

The connecting part is positioned between two ends of the arm part and near one end of the arm part, so that the base plate is H-shaped.

In one embodiment, the substrate has a plurality of first positioning holes, and the first positioning holes are distributed on the arm portion and/or the connecting portion.

In one embodiment, the first positioning hole is located at an end position on the arm portion, and/or the first positioning hole is located at a position on the connecting portion corresponding to an end of the arm portion.

In one embodiment, the light source assembly further comprises a second light bar comprising an L-shaped or straight strip-shaped substrate and a plurality of LEDs disposed on the substrate, wherein a connector is disposed at an end of the substrate.

In one embodiment, the light source assembly comprises two light bar groups opposite to each other in a first direction, each light bar group comprises a plurality of light bars arranged in parallel in a second direction perpendicular to the first direction, the light bars are the first light bars and/or the second light bars, and the second light bars are L-shaped or straight light bars;

The two lamp bar groups are provided with approaching sides which are close to each other, and the connecting part of the connector of the first lamp bar and the end part of the connector of the second lamp bar in the same lamp bar group are positioned on the approaching sides.

In one embodiment, two lamp bar groups are spaced from each other and form a strip-shaped spacing area, and a connecting piece is arranged in the strip-shaped spacing area; the connecting piece is a plurality of connecting wires which are routed along the strip-shaped interval area, and each connecting wire is connected with the connector of at least one lamp strip; or (b)

The connecting piece is an adapter plate extending along the strip-shaped interval zone, a circuit is arranged in the adapter plate, a plurality of opposite-plug terminals are arranged on the adapter plate, and the opposite-plug terminals can be correspondingly plugged with the connectors of the light bars.

In one embodiment, the adapter plate has a strip structure independent of the two light bar groups, two side parts of the adapter plate are respectively provided with a plurality of opposite inserting terminals, and the opposite inserting terminals are respectively inserted with the connectors of the light bars in the two light bar groups at two sides in a one-to-one correspondence manner; or (b)

The connecting piece is a strip-shaped structure for connecting a plurality of lamp strips in one lamp strip group along the second direction, the connecting part of the first lamp strip is used as a part of the connecting piece, the built-in circuit of the connecting piece is directly and electrically connected with the LEDs of the lamp strip group where the built-in circuit of the connecting piece is located, one side part of the connecting piece is also provided with a plurality of opposite inserting terminals, and the opposite inserting terminals are in one-to-one corresponding insertion with the connectors of a plurality of lamp strips in the other lamp strip group.

In one embodiment, the interposer is a single layer board or a multi-layer board.

In one embodiment, the backlight module further comprises a reflecting sheet, the reflecting sheet is attached to the light source assembly, the reflecting sheet is formed by splicing a plurality of splicing sheets, the splicing sheets comprise a bottom plate part, a slope part is connected to part of the edge of the bottom plate part, and the edge of the bottom plate part, which is not connected with the slope part, is a splicing edge;

each splicing edge of each splicing sheet is respectively provided with at least one second positioning hole, and two splicing sheets spliced with each other are positioned through the second positioning holes.

In one embodiment, each of the splice edges has the second positioning hole at a position close to the slope portion in the extending direction of the splice edge.

In one embodiment, part of the spliced edge further has the second positioning hole at a position away from the slope portion in the extending direction of the spliced edge.

In one embodiment, the bottom plate part is provided with a plurality of LED holes distributed in an array mode, and the second positioning holes are positioned between the distribution area of the LED holes and the splicing edge;

In the direction perpendicular to the extending direction of the corresponding spliced edge, the distance m between the corresponding second positioning hole and the nearest LED hole and the distance n between the two adjacent LED holes satisfy the following conditions: m=0.5n.

In one embodiment, for the two splice sheets spliced with each other, the portions where the two splice edges are positioned overlap each other so that the two second positioning holes at the two splice edges are facing up and down, and the width of the overlapped portions does not exceed the maximum allowable width.

In one embodiment, the bottom plate part of the splicing piece is further provided with a lifting cover and a position avoiding hole, the lifting cover is a sheet body separated from the bottom plate part, and the lifting cover and the position avoiding hole are used for other assembly members protruding out of the reflecting sheet to pass through during assembly;

the lifting cover of the reflecting sheet attached to the light source assembly corresponds to the connector protruding outwards on the light bar.

In one embodiment, the backlight module comprises a back plate, the light source assembly, the reflecting sheet, a diffusion plate, a quantum dot membrane and a brightness enhancement membrane which are sequentially laminated;

The back plate is uniformly provided with a plurality of support columns, and the support columns sequentially penetrate through the light source assembly and the reflecting sheet and support the diffusion plate.

In a second aspect, the light bar cutting tool of the backlight module provided by the utility model comprises two tool groups oppositely arranged in a third direction, each tool group comprises a plurality of tools arranged in parallel in a fourth direction perpendicular to the third direction, the shape of each tool is the same as that of the first light bar, and each tool comprises two tool arms;

the cutters in two cutter groups are in an opposite insertion layout, and two cutter arms, close to each other, of two adjacent cutters in one cutter group are inserted into a region between the two cutter arms of one cutter in the other cutter group.

In one embodiment, the vertical distance a between the centerlines of two of the cutter arms of the same cutter, the width B of the cutter arms, and the cutting minimum process spacing c satisfy: a=3b+3c.

In a third aspect, the present utility model provides a display device, which includes the above-mentioned backlight module, and further has all local technical effects.

The above-described features may be combined in various suitable ways or replaced by equivalent features as long as the object of the present utility model can be achieved.

Compared with the prior art, the backlight module, the module light bar cutting tool and the display device provided by the utility model have the following beneficial effects:

according to the backlight module, the module light bar cutting tool and the display device, the light bar of the backlight module is optimally designed, the light bar is provided with the two arm parts, the two arm parts are provided with the LEDs and are electrically connected through the connector, compared with the existing light bar, the number of cables and connectors is greatly reduced, so that the assembly efficiency can be effectively improved, manpower and materials required by assembly are reduced, and meanwhile, the overall risk of connector reliability can be reduced due to the reduction of the number of connectors.

Drawings

The utility model will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

fig. 1 shows an exploded view of the structure of a backlight module of the present utility model;

fig. 2 shows a schematic structure of a first light bar of a light source assembly of the backlight module of the present utility model;

FIG. 3 is a schematic diagram showing a structure of a light source assembly of the backlight module according to the present utility model when the light source assembly is mounted on a back plate;

FIG. 4 is a schematic view showing the structure of the light source module shown in FIG. 3 connected to one type of connector (connecting wire);

FIG. 5 shows a schematic view of the structure of a light source module connected to another type of connector (adapter plate);

FIG. 6 shows a schematic view of a partial structure at the transfer plate of FIG. 5;

fig. 7 shows a schematic structural diagram of a reflective sheet of the backlight module in an unjoined state;

FIG. 8 shows a schematic view of one of the splice pieces of the reflective sheet shown in FIG. 7;

fig. 9 shows a schematic structural diagram of a reflection sheet of the backlight module in a spliced state;

fig. 10 shows a schematic view of a light source assembly of a backlight module of the present utility model after being mounted on a back plate and having a double-sided tape;

FIG. 11 is a schematic diagram showing a distribution structure of support columns of the backlight module on a back plate;

FIG. 12 is a schematic diagram showing a structure of a back plate of a backlight module according to the present utility model;

fig. 13 shows a schematic view of the structure of the light bar cutting tool of the present utility model.

In the drawings, like parts are designated with like reference numerals. The figures are not to scale.

Reference numerals:

1-light source component, 11-first lamp strip, 111-base plate, 1111-arm, 1112-connecting part, 112-LED, 113-connector, 114-first coarse positioning hole, 115-first fine positioning hole, 12-connecting piece, 121-connecting wire, 122-adapter plate, 123-plug-in terminal, 2-reflector plate, 21-plug-in piece, 211-bottom plate part, 212-slope part, 22-second fine positioning hole, 23-second coarse positioning hole, 24-flip cover, 25-avoidance hole, 3-back plate, 31-back plate bottom plate, 32-back plate slope, 33-lamp strip positioning point, 34-reflector plate positioning point, 35-wire hole, 4-diffuser plate, 5-quantum dot film, 6-brightening film, 7-double-sided adhesive tape, 8-support column, 9-cutter set, 91-cutter, 911-cutter arm and 10-corner area.

Detailed Description

The utility model will be further described with reference to the accompanying drawings.

Example 1

The embodiment is mainly described with respect to a light bar in a backlight module.

The embodiment of the utility model provides a backlight module, the backlight module comprises a light source assembly 1, the light source assembly 1 comprises a first light bar 11, the first light bar 11 comprises a substrate 111 and a plurality of LEDs 112 arranged on the substrate 111, the substrate 111 comprises two strip-shaped arm sections 1111 and a connecting part 1112 for connecting the two arm sections 1111, and a connector 113 electrically connected with the LEDs 112 arranged on the arm sections 1111 is arranged at the connecting part 1112.

Specifically, in the present utility model, the structure of the light bar of the light source assembly 1 is optimized, as shown in fig. 2, the first light bar 11 is designed to have two arms 1111, the two arms 1111 are connected together by the connecting portion 1112, and in actual manufacturing, the arms 1111 and the connecting portion 1112 are integrally formed, and are directly cut from the PCB motherboard. The plurality of LEDs 112 are disposed on the two arm sections 1111, and the whole LEDs 112 are distributed in an array, and the connector 113 is disposed on the connection section 1112, and the connector 113 connects the LEDs 112 through a substantially built-in line.

The connector 113 is of a horizontal type 20pin0.5pitch type, and the horizontal type has a relatively small height of about 3 mm. The LED112 is of the MINI LED type, either PCT3528 or 2016 of POB (package on PCB board) or COB (chip on PCB board), i.e. the chip is directly mounted on the PCB substrate 111. The upper part of the LED can be provided with a lens or not, and the LED can be blue light (without fluorescent powder) or white light (with fluorescent powder). The LED112 of the MINI LED is blue, phosphor-free.

Through the optimization of the structure, the first light bar 11 of the utility model actually has two luminous parts, namely the LEDs 112 on the two arm parts 1111, so that under the same specification, the number of the independently arranged light bars is reduced by half, and the number of corresponding external circuits connected with the light bars and connectors is greatly reduced, thereby being beneficial to reducing the risk of the reliability of connector connection and improving the connection and assembly efficiency of components.

Taking the assembly operation of MINI LED TV with 65 inches as an example, the comparison between the backlight module using the first light bar 11 and the backlight module using the existing vertical light bar in the actual assembly process is as follows:

further, the connection portion 1112 is located at an end position of the arm portion 1111 so that the base plate 111 is U-shaped; or the connection portion 1112 is located between the two ends of the arm portion 1111 and near one end thereof so that the base 111 has an H shape.

Specifically, based on the structural design that the first light bar 11 includes two arm portions 1111, the positions of the connection portions 1112 may be finely adjusted within a certain range, that is, the connection portions 1112 are generally disposed near the end portions of the arm portions 1111, so that the opposite-insertion layout of the substrates 111 corresponding to the plurality of first light bars 11 can be achieved during the splitting. The connection 1112 is most preferably located directly at the end of the arm 1111 as shown in fig. 2 of the drawings, such that the entire first light bar 11 assumes a U-shaped configuration. Of course, the connection portion 1112 may be disposed near the end of the arm portion 1111, instead of being directly located at the end of the arm portion 1111, so that the entire first light bar 11 has an H-shaped structure; in this structure, the closer the connecting portion 1112 is to the end of the arm portion 1111.

In addition, the structure in which the connection portion 1112 is provided near the end of the arm portion 1111 can also facilitate wiring for the light bar during assembly, and can also maximally shorten the length of the cable, as shown in fig. 4 of the accompanying drawings.

Further, the first light bar is required in terms of structural size, referring to fig. 2 of the accompanying drawings, that is, the vertical distance a between the center lines of the two arms 1111, the width b of the arms 1111, and the cutting minimum process spacing c satisfy: a=3b+3c. This is to meet the cutting requirements of the PCB motherboard for maximum utilization, while at the same time achieving a design based on the structural dimensions of the first light bar 11 for cost reduction.

In particular, considering that the PCB mother board is a rectangular one-piece board, it is necessary to ensure that the mother board is substantially free of scraps, i.e., the maximum utilization of the mother board, in order to reduce the cost. Theoretically, the mother board can be maximally utilized as long as the plurality of first light bars 11 can be closely spliced with each other to form one plane covering the mother board. The needles are required for planning during the dividing process, so that the plurality of first light bars 11 can be tightly spliced with each other to form a cutting layout covering the plane of the motherboard, i.e. the splicing structure of the plurality of first light bars 11 is planned. Therefore, based on the structural design of the two arm sections 1111 of the first light bar 11, the staggered and opposite layout of the first light bar 11 can maximize the utilization of the motherboard, and the splitting efficiency is highest; i.e. two arm sections 1111 of two adjacent first light bars 11 close to each other are interposed between two arm sections 1111 of the other first light bar 11, so that the space necessary for cutting is taken into account, i.e. the above relation a=3b+3c is obtained.

It should be noted that the structural dimensions of the first light bar 11 satisfying a=3b+3c are merely the final result, and from the process point of view, the relation is actually realized by designing the structure and the dimensions of the cutting tool, that is, the design of the light bar cutting tool in embodiment 4.

In this embodiment, the minimum process pitch c of the dicing satisfies: c is more than or equal to 1mm and less than or equal to 2mm. The minimum process spacing c=1.5 mm is preferably cut. Taking the first light bar 11 of one practical specification as an example, the arm 1111 of the first light bar 11 is 12mm, the process requires that the spacing between the cut light bars is 1.5mm at minimum, and the vertical distance between the center lines of the two arm 1111 of the first light bar 11 (i.e. the LED pitch) =12×3+1.5×3=40.5 mm. By adjusting the width of the arm 1111 and the dicing pitch, the LED pitch may be adjusted within a certain range. Obviously, the smaller the two data, the smaller the area of use of the PCB corresponding to the substrate 111, and the lower the cost of a single light bar.

Further, the narrower the width of the connection portion 1112 in the extending direction of the arm portion 1111, the smaller the entire area of the substrate 111, with the connection portion 1112 being kept to meet the requirements for providing the connector 113 and the internal wiring, which is advantageous for cost control. In this embodiment, the width of the connection portion 1112 in the extending direction of the arm portion 1111 is 15 to 50mm; preferably, the width of the connection 1112 is 20-30mm.

Taking a 65 inch MINI LED TV as an example, the backlight area is 1.16m 2, and the characteristic parameters of the lamp bars with various structures are as follows:

From the aspect of area, the first light bar 11 of the present utility model has an area increased by 0.014m 2 compared to the existing straight light bar, and has a cost increased by about 2.8RMB, calculated as 200RMB per square meter. However, combined with the foregoing substantial reduction in assembly costs for the first light bar 11, a slight increase in the cost of the first light bar 11 over the PCB area is acceptable.

Further, in order to enable the first light bar 11 to be accurately positioned on the back plate 3 during assembly, a plurality of first positioning holes are provided on the base plate 111 of the first light bar 11, and the first positioning holes are distributed on the arm portion 1111 and/or the connection portion 1112.

Preferably, the first positioning hole is located at an end position on the arm 1111, and/or the first positioning hole is located at a position on the connection portion 1112 corresponding to an end of the arm 1111. The first positioning hole of the end position can ensure the accuracy of positioning the first light bar 11.

The first positioning hole is divided into a first coarse positioning hole and a first fine positioning hole, the first lamp strip of the embodiment is provided with 3 first coarse positioning holes and 1 first fine positioning hole, the first coarse positioning holes and the 1 first fine positioning hole are respectively located at four corners of the first lamp strip, and the first fine positioning holes are arranged at positions where the connecting portions are located. In this embodiment, the diameter of the first fine positioning hole is 3.8mm, and the diameter of the positioning protruding point on the back plate 3 is 3.5mm, so that the positioning can be very accurate.

Further, the light source assembly 1 further comprises a second light bar (not shown in the drawings), which is substantially identical in structure to the first light bar 11, but only different in shape. The second light bar includes an L-shaped or straight substrate 111 and a plurality of LEDs 112 disposed on the substrate 111, and a connector 113 is disposed at an end of the substrate 111. On the basis of the first light bar 11, the light source assembly 1 basically already enables the aforementioned technical effects of improvement of the assembly efficiency, reduction of the number of joints and cables and reduction of the risk of connection reliability at the joints. The second light bar mainly further improves the utilization rate of the PCB mother board, referring to the arrangement structure of the cutter shown in fig. 13 (corresponding to the structure of the cut PCB mother board), the edge portion of the cutter always has a corner area 10, which corresponds to the cut corner portion of the PCB mother board, and the corner portion cannot form the complete first light bar 11, but can be processed into an L-shaped or straight second light bar, which can also be used as a part of the light source assembly 1. As can be seen from fig. 13, under certain conditions, one PCB mother board can cut out a plurality of first light bars 11, but only 2 second light bars are generated, so that only part of the second light bars are inserted into the light source assembly 1 at intervals, and the technical effect brought by the first light bars 11 to the light source assembly 1 is not affected. Even if the second light bars of the plurality of PCB motherboards are collected to form a light source assembly 1 having only the second light bars, the first light bars 11 are still the main part from the whole production line, and still have the corresponding technical effects.

Further, the light source assembly 1 includes two light bar groups opposite to each other in the first direction, each light bar group includes a plurality of light bars arranged in parallel in a second direction perpendicular to the first direction, the light bars are first light bars 11 and/or second light bars, and the second light bars are L-shaped or straight light bars;

wherein, the two light bar groups have approaching sides close to each other, and the connecting part 1112 where the connector 113 of the first light bar 11 is located and the end where the connector 113 of the second light bar is located in the same light bar group are both located at the approaching sides.

Specifically, as shown in fig. 3 of the drawings, the light source assembly 1 assembled to the back plate 3 includes two light bar groups, each including a plurality of light bars arranged vertically, and the light bars are preferably aligned at their ends and parallel to each other. The light bar group can be composed of the first light bar 11 or the second light bar, and also can be composed of the first light bar 11 and the second light bar; the light bar group in this embodiment preferably consists entirely of the first light bar 11. In view of the convenience of line connection during assembly, the end portion of the connector 113 on the light bar is located at the approaching side of the two light bar groups, so that the light bar groups on both sides can be simultaneously connected by only arranging a line at the position near the middle.

Further, the two lamp bar groups are spaced from each other and form a strip-shaped spacing zone, and a connecting piece 12 is arranged in the strip-shaped spacing zone; the connecting piece 12 is a plurality of connecting lines 121 which are routed along the strip-shaped spacing areas, and each connecting line 121 is connected with the connector 113 of at least one light strip; or (b)

The connecting piece 12 is an adapter plate 122 extending along the strip-shaped interval region, a circuit is built in the adapter plate 122, a plurality of opposite-plug terminals 123 are arranged on the adapter plate 122, and the opposite-plug terminals 123 can be correspondingly plugged with the connectors 113 of the light strip.

Specifically, as shown in fig. 4 of the drawings, the connection member 12 is disposed in a strip-shaped interval region between two light bar groups, and the connection member 12 may be a conventional connection wire 121 (FFC flat cable) or an adapter plate 122. The connecting wires 121 are made of 4-in-1 wires, and one connecting wire 121 can be connected with at least 1 and at most 4 light bars. Under the same wire specification, the first light bar 11 is compared with the existing straight light bar, the connecting wire 121 only has 18 (original 36) connectors, the adopted 4-in-1 wire is a minimum of 5 connectors, and the number of connectors connected to the external control is only 5 (original 9). The adapter plate 122 adopts a plate structure, a plurality of circuits are built in, and more lamp strips can be connected through the arranged opposite plug terminals 123; in theory, one adapter plate 122 can connect all the light bars in the light source assembly 1, and only one connector is needed for connecting one adapter plate 122 with an external circuit (control board part), so that the number of connectors of the adapter plate 122 can be further reduced.

Further, the adapter plate 122 has a strip structure independent of the two light bar groups, two sides of the adapter plate 122 are respectively provided with a plurality of opposite plug terminals 123, and the opposite plug terminals 123 are respectively plugged with the connectors 113 of the light bars in the two light bar groups at two sides in a one-to-one correspondence manner; or (b)

The connecting piece 12 is a strip structure for connecting a plurality of light bars in one light bar group along the second direction, the connecting part 1112 of the first light bar 11 is used as a part of the connecting piece 12, the built-in circuit of the connecting piece 12 is directly and electrically connected with the LEDs 112 of the light bar group where the built-in circuit is located, one side part of the connecting piece 12 is also provided with a plurality of opposite inserting terminals 123, and the opposite inserting terminals 123 are in one-to-one corresponding inserting connection with the connectors 113 of a plurality of light bars in the other light bar group.

Specifically, two specific structures of the interposer 122 are selectable based on the technical solution of the interposer 122 for electrical connection. First, the adapter plate 122 may be configured as a strip structure independent of two light bar groups, so that the adapter plate 122 may be separately configured, and multiple opposite terminals 123 may be simultaneously disposed at two sides of the adapter plate 122 to connect two light bar groups at two sides respectively. Secondly, the connection member 12 may be selectively combined with one of the light bar groups, as shown in fig. 5, the adapter plate 122 connects the light bars in the light bar groups in the arrangement direction of the light bars, so that the adapter plate 122 actually connects the light bars into a whole, and the adapter plate 122 can directly connect the light bars in the light bar group where the adapter plate 122 is located through an internal circuit, and only needs to provide a plurality of plug terminals on one side to connect the other light bar group.

In addition, considering that one adapter plate 122 is connected to all the light bars in the light source assembly 1, the number of internal circuits is relatively large, and a certain requirement is imposed on the size of the internal space, so that the adapter plate 122 can be configured as a multi-stage split structure, and each stage corresponds to a part of the light bars. As shown in fig. 5 of the drawings, in this embodiment, the adaptor plate 122 is divided into two sections, each section corresponds to a plurality of light bars, so that each section of the adaptor plate 122 is connected to an external control board through a connection line 121 (FFC flat cable).

In addition, the interposer 122 is a single-layer board or a multi-layer board. Because the interposer 122 needs a built-in circuit, a certain space is also required in the interposer 122, and the internal space of the multi-layer board is larger than that of the single-layer board under the condition of the same area. Therefore, in practical application, the specific structure of the interposer 122 is combined with the area, single layer or double layer of the interposer 122, wiring requirement, independent interposer 122 or fusion interposer 122.

Taking a practical example of a light bar, if the pitch between the LEDs 112 of the light bar is 45mm and the width of the arm 1111 of the substrate 111 is 12mm, the width of the intermediate space is 33mm, and the width of the counter terminal currently used is 10mm, and the safety distance between the removed components is 1mm, so that wiring can be performed only at 22 mm. If the independent adapter plate 122 is adopted, the opposite terminals 123 are arranged on both sides, only 12mm of the adapter plate 122 can be wired, and only 20 adapter plates can be wired, so that a multilayer plate (the space for wiring is increased) is needed, but the cost is high. With the fusion patch panel 122, a single panel may be used, as shown in fig. 6, with a limit layout space of L, l=45-1-1=43 mm. One of which 1mm is the LED112 to board edge safety distance on the other side and the other 1mm is the spacing between the two boards. It was found that there was a wiring space of 43mm, 80 wires could be routed, which is sufficient for most MINI LED projects.

Example 2

The embodiment is mainly described with respect to a reflective sheet in a backlight module.

Taking 65 inch (1440 x 810 mm) reflector as an example, the tolerance of the process is 0.5mm, the LED of the MINI LED is only 3.5mm, the diagonal size is 4.48, the hole of the reflector is 6mm, and the assembly gap is only 1.52. Therefore, if the size is too small, assembly deviation increases, affecting the LED brightness, which is unacceptable for MINI LEDs. The industry therefore uses small blocks for stitching.

When the reflector plates are used for splicing, operators cannot align when assembling the slope reflector plates, if the level difference is generated, dark lines/bright lines are caused, and the images are uneven, so that the whole slope is used in the industry and is separated from the bottom plate, and the higher precision of each slope reflector plate is achieved. However, the design of the corresponding reflection sheet is complicated, and the assembly efficiency is greatly reduced.

To this end, an embodiment of the present utility model provides a backlight module, the backlight module includes a reflective sheet 2, the reflective sheet 2 is attached to a light source assembly 1, the reflective sheet 2 is formed by splicing a plurality of splicing sheets 21, the splicing sheets 21 include a bottom plate portion 211, a slope portion 212 is connected to a part of an edge of the bottom plate portion 211, and an edge of the bottom plate portion 211, to which the slope portion 212 is not connected, is a splicing edge;

Wherein, each splicing edge of each splicing piece 21 is respectively provided with at least one second positioning hole, and two splicing pieces 21 spliced with each other are positioned through the second positioning holes.

Specifically, the reflective sheet 2 of the present embodiment still adopts the splice structure, but is different in that the bottom plate portion 211 and the slope portion 212 are included in each splice piece 21, the problem that the slope portion 212 needs to be assembled separately is solved, and the reflective sheet 2 of the present embodiment includes only two types of splice pieces 21 under the condition that the divided forms and the number of the reflective sheets 2 are the same, as shown in fig. 7 of the drawings, the upper left and lower right, and the lower left and upper right splice pieces 21 are completely identical. The conventional splicing piece 21 is formed by dividing the bottom plate portion 211 and the slope portion 212 and further dividing them, which results in a wider variety of splicing portions, which is disadvantageous in design and stock.

The splicing pieces 21 in this embodiment are positioned and spliced by adopting the second positioning holes formed at the splicing edges, that is, after the corresponding second positioning holes correspond, the positions of the two splicing pieces 21 are indicated to correspond. When the 4 splicing pieces 21 in the embodiment are overlapped together through the second positioning holes, the whole reflecting sheet 2 is spliced, the total of 4 transverse second positioning holes and 2 vertical second positioning holes are formed, and 6 corresponding salient points are arranged at the corresponding positions of the backboard 3. The upper left and lower left reflectors 2 have a common positioning point, and the error is only 0.2mm (the hole is 3.2mm and the salient point is 3 mm), so that the slopes at the upper left and lower left are accurately spliced at the splice position, and the section difference cannot be produced; upper right and lower right, lower left and lower right are the same.

Further, each of the splice edges has a second positioning hole at a position close to the slope portion 212 in the extending direction of the splice edge. Preferably, a portion of the splice edge also has a second locating hole located away from the ramp 212 in the direction of extension of the splice edge.

Specifically, as shown in fig. 7 of the accompanying drawings, the second positioning holes include a second fine positioning hole 22 and a second coarse positioning hole 23. Positioning protruding points are correspondingly arranged on the backboard 3, the diameter of each positioning protruding point is 3mm, the diameter of each second fine positioning hole 22 is 3.2mm, and the reflector plate 2 can be accurately positioned on the backboard 3 through the fine positioning holes. The second rough positioning hole 23 is a strip hole, has the width of 3.2mm and the length of 5.2mm, and plays an auxiliary placing role. In order to ensure the accuracy of the splicing of the slope portion 212, the second positioning hole close to the slope portion 212 is a second fine positioning hole 22, and the second positioning hole far away from the slope portion 212 and close to the center of the reflector plate 2 is a second coarse positioning hole 23.

Further, the bottom plate 211 has a plurality of LED holes distributed in an array, and the second positioning holes are located between the distribution area of the LED holes and the splicing edge;

in the direction perpendicular to the extending direction of the corresponding spliced edge, the distance m between the corresponding second positioning hole and the nearest LED hole and the distance n between the two adjacent LED holes satisfy the following conditions: m=0.5n.

Specifically, as shown in fig. 8 of the accompanying drawings, in order to ensure the positioning accuracy, there is a further design for the position of the second positioning hole, whether in the transverse direction and the longitudinal direction, the distance m between the corresponding second positioning hole and the nearest LED hole and the distance n between the adjacent two LED holes satisfy: m=0.5n. Transverse direction, i.e. m _x ＝0.5n _x In the longitudinal direction, i.e. m _y ＝0.5n _y 。

Further, for the two splice pieces 21 spliced with each other, the portions where the two splice edges where the splicing is performed overlap each other so that the two second positioning holes at the two splice edges face up and down, and the width of the overlapped portions does not exceed the maximum allowable width.

Specifically, as shown in fig. 9 of the accompanying drawings, in this embodiment, the 4 splice pieces 21 are placed in an overlapping manner, and the width of the overlapping portion is not limited, but generally does not exceed 10mm, so that the width is not large and no additional adhesion is required. The order of placement and splicing between the 4 splice pieces 21 is not limited, and may be, for example, upper left-upper right-lower left-lower right

Further, the bottom plate 211 of the splicing piece 21 is further provided with a cover 24 and a clearance hole 25, the cover 24 is a sheet body separated from the bottom plate 211, and the cover 24 and the clearance hole 25 are used for other assembly members protruding from the reflecting sheet 2 to pass through during assembly; wherein, the lifting cover 24 of the reflector plate 2 attached to the light source assembly 1 corresponds to the connector 113 protruding outwards on the light bar.

Specifically, as shown in fig. 8 of the drawings, the flip cover 24 and the avoidance hole 25 are respectively used for making other assembly members protruding from the reflective sheet 2 pass through the reflective sheet 2. The cover 24 is a half-open structure, and has 3 sides cut away from the splicing sheet 21, and 1 side connected to the splicing sheet 21, for covering the connector 113 after the connector 113 passes through the body of the reflective sheet 2, so as to ensure the light reflection effect. The clearance hole 25 is mainly used for the support column 8 to pass through, and the support column 8 needs to support other components, so that the support column 8 cannot be covered by adopting a structure similar to the lifting cover 24.

Example 3

The present embodiment is mainly described with respect to the overall structure of the backlight module.

The embodiment of the utility model provides a backlight module, which comprises a back plate 3, a light source assembly 1, a reflecting sheet 2, a diffusion plate 4, a quantum dot membrane 5 and a brightness enhancement membrane 6 which are sequentially stacked; wherein, a plurality of support columns 8 are uniformly distributed on the back plate 3, and the support columns 8 sequentially penetrate through the light source assembly 1 and the reflecting sheet 2 and support the diffusion plate 4.

Specifically, the structure of the backlight module is shown in fig. 1 of the accompanying drawings. The assembly process is as follows:

first, the back plate 3 was prepared, and the pelvic depth of the back plate 3 was 23mm (a general depth in industry), that is, an OD value of 22mm (an optical distance mixing distance of 22mm, since the thickness of the light bar PCB substrate 111 was 1mm to be subtracted). As shown in fig. 12 of the accompanying drawings, the backboard 3 is composed of a backboard base plate 31 and 4 backboard slopes 32, a light bar positioning point 33 is arranged on the backboard 3, a cross star indicates the light bar positioning point 33, and each row of the backboard 3 in the embodiment has 4 positioning points, and the total number of the positioning points is 18; the backboard 3 is also provided with 4 wire outlets 35, in this embodiment, the number of the wire outlets 35 is 4; the back plate 3 is further provided with 6 reflector positioning points 34, which are 6 in this embodiment.

And then the organic silica gel for fixing the lamp strip is sprayed on the backboard 3 through automatic dispensing equipment, the diameter of each glue point is 4mm, the glue points are positioned right below the position of the assembled LED112, and then the lamp strip is placed. Then, a plurality of double-sided tape 7 was attached to the light source module 1 composed of the light bars, and as shown in fig. 10 of the accompanying drawings, the double-sided tape 7 was 0.15mm thick for attaching the reflection sheet 2.

Then, the support columns 8 are placed on the back plate 3, referring to fig. 11 of the accompanying drawings, in this embodiment, 16 support columns 8 are placed on the back plate 3 through positioning auxiliary jigs, the support columns 8 are made of transparent PC materials, the support columns 8 are divided into a chassis and a support body, the total height is 22.5mm (less than 23 mm), and the back glue at the bottom is adhered on the back plate 3 through glue. The function of the support posts 8 is to support the diffuser plate 4 and other membrane sheets of the support posts 8 to prevent collapse of the diffuser plate 4.

Finally, a diffusion plate 4, a quantum dot membrane 5 and a brightening membrane 6 are sequentially arranged. The diffusion plate 4 is a rigid plate made of PS material with a thickness of 2mm, and serves to support the diaphragm and mix light. The quantum dot membrane 5 is a yellow membrane with the thickness of 0.3mm, is of a sandwich structure, is made of quantum dot nano materials in the middle, and can be excited by the LED112 to emit pure green light and red light to form a high-color-gamut backlight. The brightness enhancement film 6 is a composite film such as DPP (diffusion film+prism+prism) or MOP (mig lens film+prism), so that the brightness of the module can be greatly improved; wherein the DPP has a thickness of 0.4mm.

Example 4

The present embodiment is mainly described with respect to a light bar cutting tool.

An embodiment of the present utility model provides a light bar cutting tool of the backlight module of the foregoing embodiment, where the cutting tool includes two tool groups 9 disposed opposite to each other in a third direction, each tool group 9 includes a plurality of tools 91 disposed in parallel in a fourth direction perpendicular to the third direction, the shape of the tools 91 is the same as the shape of the first light bar 11, and the tools 91 include two tool arms 911;

wherein the cutters 91 in two cutter groups 9 are in a butt-insert arrangement, and two cutter arms 911 of two adjacent cutters 91 in one cutter group 9, which are close to each other, are inserted into a region between the two cutter arms 911 of one cutter 91 in the other cutter group 9.

Further, the vertical distance a between the center lines of the two arms 911 of the same cutter 91, the width B of the arms 911, and the cutting minimum process spacing c satisfy: a=3b+3c.

The principle of the design of the size and structure of the light bar cutting tool in this embodiment is the same as that of the first light bar 11 in embodiment 1, and reference may be made to the content of the corresponding part in embodiment 1, which is not repeated here.

Example 5

The embodiment of the utility model provides a display device which comprises the backlight module and further has all technical effects.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "bottom," "top," "front," "rear," "inner," "outer," "left," "right," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

Although the utility model herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present utility model. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present utility model as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.

Claims (22)

1. The backlight module is characterized by comprising a light source assembly, wherein the light source assembly comprises a first light bar, the first light bar comprises a substrate and a plurality of LEDs arranged on the substrate, the substrate comprises two strip-shaped arm parts and a connecting part connected with the two arm parts, and the connecting part is provided with a connector electrically connected with the LEDs arranged on the arm parts.

2. A backlight module according to claim 1, wherein the vertical distance a between the center lines of the two arms, the width b of the arms, and the cutting minimum process pitch c satisfy: a=3b+3c.

3. A backlight module according to claim 2, wherein the cutting minimum process pitch c satisfies: c is more than or equal to 1mm and less than or equal to 2mm.

4. A backlight module according to claim 1, wherein the width of the connecting portion in the extending direction of the arm portion is 15-50mm.

5. The backlight module according to claim 1, wherein the connecting portion is located at an end portion of the arm portion so that the substrate is U-shaped; or (b)

The connecting part is positioned between two ends of the arm part and near one end of the arm part, so that the base plate is H-shaped.

6. A backlight module according to claim 1, wherein the substrate has a plurality of first positioning holes, and the first positioning holes are distributed in the arm portion and/or the connection portion.

7. A backlight module according to claim 6, wherein the first positioning hole is located at an end position on the arm portion, and/or the first positioning hole is located at a position on the connection portion corresponding to an end of the arm portion.

8. The backlight module according to claim 1, wherein the light source assembly further comprises a second light bar, the second light bar comprises an L-shaped or straight bar-shaped substrate and a plurality of LEDs disposed on the substrate, and a connector is disposed at an end of the substrate.

9. The backlight module according to claim 1, wherein the light source assembly comprises two light bar groups opposite to each other in a first direction, each light bar group comprises a plurality of light bars arranged in parallel in a second direction perpendicular to the first direction, the light bars are the first light bars and/or the second light bars, and the second light bars are L-shaped or straight light bars;

the two lamp bar groups are provided with approaching sides which are close to each other, and the connecting part of the connector of the first lamp bar and the end part of the connector of the second lamp bar in the same lamp bar group are positioned on the approaching sides.

10. The backlight module according to claim 9, wherein two of the lamp bar groups are spaced apart from each other and form a strip-shaped spacing region, and a connecting piece is arranged in the strip-shaped spacing region; the connecting piece is a plurality of connecting wires which are routed along the strip-shaped interval area, and each connecting wire is connected with the connector of at least one lamp strip; or (b)

The connecting piece is an adapter plate extending along the strip-shaped interval zone, a circuit is arranged in the adapter plate, a plurality of opposite-plug terminals are arranged on the adapter plate, and the opposite-plug terminals can be correspondingly plugged with the connectors of the light bars.

11. The backlight module according to claim 10, wherein the adapter plate has a strip structure independent of two light bar groups, two side portions of the adapter plate are respectively provided with a plurality of opposite plug terminals, and the opposite plug terminals are respectively plugged with the connectors of a plurality of light bars in the two light bar groups on two sides in a one-to-one correspondence manner; or (b)

The connecting piece is a strip-shaped structure for connecting a plurality of lamp strips in one lamp strip group along the second direction, the connecting part of the first lamp strip is used as a part of the connecting piece, the built-in circuit of the connecting piece is directly and electrically connected with the LEDs of the lamp strip group where the built-in circuit of the connecting piece is located, one side part of the connecting piece is also provided with a plurality of opposite inserting terminals, and the opposite inserting terminals are in one-to-one corresponding insertion with the connectors of a plurality of lamp strips in the other lamp strip group.

12. A backlight module according to claim 11, wherein the adapter plate is a single-layer plate or a multi-layer plate.

13. A backlight module according to any one of claims 1 to 11, further comprising a reflective sheet attached to the light source assembly, the reflective sheet being formed by splicing a plurality of splice pieces, the splice pieces comprising a bottom plate portion, a slope portion being connected to a part of an edge of the bottom plate portion, an edge of the bottom plate portion to which the slope portion is not connected being a splice edge;

each splicing edge of each splicing sheet is respectively provided with at least one second positioning hole, and two splicing sheets spliced with each other are positioned through the second positioning holes.

14. A backlight module according to claim 13, wherein each of the spliced edges has the second positioning hole located near the slope portion in the extending direction of the spliced edge.

15. A backlight module according to claim 14, wherein a part of the spliced edges further have the second positioning holes located away from the slope portion in the extending direction of the spliced edges.

16. The backlight module according to claim 13, wherein the bottom plate portion has a plurality of LED holes distributed in an array, and the second positioning holes are located between a distribution area of the LED holes and the spliced edge;

in the direction perpendicular to the extending direction of the corresponding spliced edge, the distance m between the corresponding second positioning hole and the nearest LED hole and the distance n between the two adjacent LED holes satisfy the following conditions: m=0.5n.

17. A backlight module according to claim 13, wherein for the two splice sheets spliced with each other, portions of the two splice edges where the splicing is performed overlap each other so that the two second positioning holes at the two splice edges are facing up and down, and a width of the overlapped portions does not exceed a maximum allowable width.

18. The backlight module according to claim 13, wherein the bottom plate portion of the splice sheet is further provided with a cover and a clearance hole, the cover is a sheet body separated from the bottom plate portion, and the cover and the clearance hole are used for other assembly members protruding from the reflective sheet to pass through during assembly;

The lifting cover of the reflecting sheet attached to the light source assembly corresponds to the connector protruding outwards on the light bar.

19. The backlight module according to claim 13, wherein the backlight module comprises a back plate, the light source assembly, the reflecting sheet, a diffusion plate, a quantum dot film and a brightness enhancement film which are sequentially laminated;

the back plate is uniformly provided with a plurality of support columns, and the support columns sequentially penetrate through the light source assembly and the reflecting sheet and support the diffusion plate.

20. A light bar cutting tool of a backlight unit according to any one of claims 1 to 19, wherein the cutting tool comprises two tool groups arranged opposite to each other in a third direction, each of the tool groups comprising a plurality of tools arranged side by side in a fourth direction perpendicular to the third direction, the tools having the same shape as the first light bar, the tools comprising two tool arms;

the cutters in two cutter groups are in an opposite insertion layout, and two cutter arms, close to each other, of two adjacent cutters in one cutter group are inserted into a region between the two cutter arms of one cutter in the other cutter group.

21. The light bar cutting tool of claim 20 wherein the vertical distance a between the centerlines of two of the arms of the same tool, the width B of the arms, and the cutting minimum process spacing c satisfy: a=3b+3c.

22. A display device comprising a backlight module according to any one of claims 1 to 19.