CN216956592U - Backlight module and splicing display device - Google Patents

Abstract

The utility model provides a backlight module and tiled display device. The backlight module comprises: a back plate; the lamp panel assembly is arranged on the back plate and formed by splicing at least two lamp panels arranged on the same plane; wherein, adjacent two piece department between the lamp plate sets up first bearing structure, first bearing structure keeps away from one side of backplate sets up first reflector plate. This backlight unit and concatenation display device can improve the light reflectivity of piece department, avoids the demonstration of lamp plate piece department to turn dark, and then ensures the homogeneity of display screen, improves display effect.

Description

Backlight module and splicing display device

Technical Field

The utility model relates to a show technical field, especially relate to a backlight unit and tiled display device.

Background

In the field of existing displays, increasing display size and resolution, reducing bezel width and body thickness have become one of the main research and development directions for those skilled in the relevant art. In order to meet the above requirements for displays, various tiled display devices have been developed. At present, a plurality of display units can be spliced by the spliced display device, so that the display effect of increasing the size of a screen is realized.

However, with the continuous integration and development of display technology and control technology, the demands of users on clear and vivid display effects are increasing.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present disclosure is to provide a backlight module and a tiled display device.

Based on the above-mentioned purpose, this disclosure provides a backlight module, includes:

a back plate;

the lamp panel assembly is arranged on the back plate and formed by splicing at least two lamp panels arranged on the same plane; wherein, adjacent two piece department between the lamp plate sets up first bearing structure, first bearing structure keeps away from one side of backplate sets up first reflector plate.

Optionally, the method further includes:

glue the frame, with backplate edge connection and with the backplate forms and is used for holding lamp plate assembly's the chamber that holds, glue at least part of frame and be located lamp plate assembly keeps away from one side of backplate.

Optionally, each the lamp panel includes:

a first printed circuit board;

the array of the plurality of light-emitting units is arranged on one side of the first printed circuit board, which is far away from the back plate, and the brightness of the light-emitting units close to the rubber frame is greater than that of the light-emitting units far away from the rubber frame.

Optionally, the luminance of the light emitting unit close to the rubber frame is 5% to 50% greater than the luminance of the light emitting unit far from the rubber frame.

Optionally, the light emitting unit includes a Mini LED.

Optionally, each the lamp panel still includes:

the light source driving chips are arranged on one side of the printed circuit board close to the back plate, and each light source driving chip controls at least one light-emitting unit to emit light;

the converter, set up in printed circuit board is close to one side of backplate, through flexible flat cable with set up in the backplate is kept away from the backlight drive plate of lamp plate subassembly one side is connected.

Optionally, the light source driving chip and the lamp panel are provided with heat conducting silica gel therebetween.

Optionally, a second supporting structure is arranged between the lamp panel and the back plate.

Optionally, the method further includes:

the optical film layer is arranged on one side, away from the backboard, of the lamp panel assembly and fixed on the rubber frame.

Optionally, the rubber frame includes a first supporting platform and a second supporting platform which are arranged in a stepped manner, and a distance between the first supporting platform and the backboard is greater than a distance between the second supporting platform and the backboard; the optical film layer is arranged on the first supporting table, and the second supporting table is provided with a diffusion plate.

Optionally, a second reflector plate is arranged on one side of the lamp panel facing the optical film layer, and the second reflector plate is provided with a hole for exposing the light emitting unit; the distance between the second reflecting sheet and the optical film layer is 12 mm.

Optionally, the first support structure comprises a light guide strip.

The present disclosure also provides a tiled display device, which includes a display panel and any one of the above backlight module, wherein the display panel is formed by at least two sub-display panels tiled together.

Optionally, the method further includes:

one end of the flexible circuit board is connected with the sub-display panel and is provided with a panel driving chip;

and one end of the second printed circuit board is connected with the other end of the flexible circuit board, and the other end of the second printed circuit board is connected with a panel driving unit arranged on one side of the lamp panel assembly and far away from the backboard.

Optionally, the flexible circuit board includes a trapezoidal portion and a rectangular portion; the lower bottom of the trapezoidal portion is laterally bound with the sub-display panel, the upper bottom of the trapezoidal portion is connected with one end of the rectangular portion, and the other end of the rectangular portion is connected with the second printed circuit board.

Optionally, the length of the second printed circuit board is smaller than the length of the sub-display panel, and the second printed circuit board includes a multi-layer board.

From the above can see out, backlight unit and concatenation display device that this disclosure provided sets up first bearing structure through the piece department between the lamp plate, sets up first reflector plate simultaneously on first bearing structure, will kick into the light reflection play of piece department through first reflector plate to can improve the light reflectivity of piece department, avoid the demonstration of lamp plate piece department to turn into dark, and then ensure the homogeneity of display screen, improve display effect.

Drawings

In order to clearly illustrate the technical solutions of the present disclosure or related technologies, the drawings used in the embodiments or related technologies description will be briefly introduced below, and obviously, the drawings in the following description are only embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a lamp panel assembly according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the disclosure;

fig. 3 is a schematic structural view of the lamp panel according to the embodiment of the present disclosure;

FIG. 4 is a schematic diagram illustrating a luminance test according to an embodiment of the disclosure;

FIG. 5 is a schematic diagram illustrating a partial enlarged display effect of the rectangular frame portion in FIG. 4 according to the present disclosure;

FIG. 6 is a schematic diagram illustrating the effect of X, Y directional luminance tests according to an embodiment of the present disclosure;

fig. 7 is a lamp panel outgoing line schematic diagram in the embodiment of the disclosure;

FIG. 8 is a schematic view of a lamp panel fixing according to an embodiment of the disclosure;

FIG. 9 is a schematic structural view of a second support structure according to an embodiment of the disclosure;

fig. 10 is a schematic view illustrating a second support structure of the lamp panel assembly according to the embodiment of the present disclosure;

FIG. 11 is a schematic view of another structure of a backlight module according to an embodiment of the disclosure;

FIG. 12 is a schematic diagram illustrating an overall structure of a display device according to an embodiment of the disclosure;

FIG. 13 is a schematic diagram of a binding of a tiled display device according to an embodiment of the disclosure;

FIG. 14 is a schematic diagram of a binding side of a display panel according to an embodiment of the disclosure;

fig. 15 is a schematic diagram of a bound side-to-side of a display panel according to an embodiment of the disclosure.

Detailed Description

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

With the continuous integration and development of liquid crystal display technology and control technology, the clear and vivid display effect of the super-large picture and multi-screen display makes the industries of command monitoring, business centers, high-end conferences, private cinemas and the like be a sense of the super-large size display. In a large-sized liquid crystal display device, a lamp panel assembly is generally formed by splicing a plurality of lamp panels. Because the lamp panels are usually of standard sizes, when the backlight modules of the display devices with different sizes are formed by splicing, a splicing seam is formed between two adjacent lamp panels after splicing; and at lamp plate piece department, the reflection effect of light is relatively poor to can lead to lamp plate piece department display screen to dim, influence the homogeneity of whole display screen.

For the above reasons, the embodiments of the present disclosure provide a backlight module. As shown in fig. 1, the backlight module includes a back panel 1 and a lamp panel assembly 2. The lamp panel assembly 2 is arranged on the backboard 1 and is formed by splicing at least two lamp panels 21 arranged on the same plane; for example, the lamp panel assembly 2 of a 55-inch display device needs six lamp panels 21 to be spliced. Adjacent two piece department between the lamp plate 21 sets up first bearing structure 22, first bearing structure 22 keeps away from one side of backplate 1 sets up first reflector plate 23. Wherein, first bearing structure 22 is used for supporting first reflector plate 23, and first reflector plate 23 can be with penetrating into the light reflection of lamp plate 21 piece department.

In this embodiment, set up first bearing structure 22 through the piece department between lamp plate 21, set up first reflector plate 23 simultaneously on first bearing structure 22, the light that will kick into piece department through first reflector plate 23 reflects out to can improve the light reflectivity of piece department, avoid the demonstration of lamp plate piece department to turn dark, and then ensure the homogeneity of display screen, improve display effect.

In some optional embodiments, the backlight module can be used for a tiled display device.

Alternatively, the first support structure 22 may be a light guide strip. The orthographic projection of light guide bar on backplate 1 falls into the orthographic projection scope of first reflector plate 23 on backplate 1, and the orthographic projection of first reflector plate 23 on backplate 1 and the orthographic projection of lamp plate 21 on backplate 1 at least partially coincide to guarantee that whole piece all is covered by first reflector plate 23, thereby make first reflector plate 23 can all reflect away the light of kicking into piece department.

In some optional embodiments, as shown in fig. 2, the backlight module further includes a rubber frame 3. Glue frame 3 with the edge connection of backplate 1 and with backplate 1 forms and is used for holding lamp plate assembly 2 hold the chamber, glue at least part of frame 3 to be located lamp plate assembly 2 keeps away from one side of backplate 1. In this embodiment, backplate 1 includes the backplate main part and sets up in the backplate kink at backplate main part edge, thereby glue frame 3 and be connected with the backplate kink and form between backplate kink and the backplate main part and hold the chamber, and lamp plate subassembly 2 sets up promptly and should hold in the chamber.

In some optional embodiments, as shown in fig. 1 and fig. 2, each of the lamp panels includes a first printed circuit board 211 and a plurality of light emitting units 212. The plurality of light emitting units 212 are arranged in an array on one side of the first printed circuit board 211 away from the back plate 1. Meanwhile, the brightness of the light emitting unit close to the rubber frame 3 is greater than that of the light emitting unit far away from the rubber frame. The second reflective sheet is disposed on a side of the first printed circuit board 211 away from the back plate 1, so as to reflect the light emitted from the light emitting unit 212 to the light incident side of the display panel.

As shown in fig. 3, the plurality of light emitting cells 212 are arranged in an equally spaced array. In a specific embodiment, the distance m between two light emitting units 212 adjacently disposed along the first direction is 13.355 mm; the pitch n of two light emitting cells 212 adjacently disposed in a second direction perpendicular to the first direction is 14.015 mm.

In this embodiment, since the reflectivity of the rubber frame 3 is lower than that of the reflective sheet, the brightness of the display screen near the rubber frame 3 may be reduced in this case. In this embodiment, the brightness of the light emitting unit 212 close to the rubber frame 3 is controlled to be greater than the brightness of the light emitting unit 212 far from the rubber frame 3, so that the display brightness at the edge is improved, and the uniformity of the display image is improved. In some optional embodiments, the brightness of the light emitting unit close to the rubber frame is 5% to 50% greater than the brightness of the light emitting unit far from the rubber frame, and may be 20%, for example.

Optionally, the light emitting unit includes a Mini LED. By arranging the Mini LED lamp panel, the contrast of the display device adopting the backlight module can be greatly improved and can reach 1000000: 1; meanwhile, the brightness of the LED display screen can be improved to 1000nit @ Typ/1500nit @ Peak, the display effect is greatly enhanced, and the experience effect of a user is improved.

In the above-described embodiment, in the display device shown in fig. 4, the luminance test is performed by selecting a plurality of test points as the X-direction luminance test points in the horizontal axis direction and a plurality of test points as the Y-direction luminance test points in the vertical axis direction, and the test result is shown in fig. 6 (where the horizontal axis represents each test point and the vertical axis represents luminance). As shown in FIG. 6, for any test point, the brightness value is between 1000-1050, the variation range is small, and the uniformity of the display effect is good. It can thus be seen that: set up first bearing structure 22 and first reflector plate 23 through the piece department at lamp plate 21, can prevent effectively that lamp plate piece department from showing dark to the homogeneity of display screen has been improved.

Fig. 5 is an edge picture shown in a rectangular frame in fig. 4, and it can be seen that the uniformity of the display effect at the edge of the display picture is good, so that it can be seen that: by controlling the brightness of the light emitting unit 212 close to the rubber frame 3 to be greater than the brightness of the light emitting unit 212 far from the rubber frame 3, the display brightness at the edge is improved, and the uniformity of the display picture is improved.

Optionally, the thickness of the first printed circuit board 211 is the same as the thickness of the light guide bar, and the distance between the second reflector mounted on the first reflector 23 and the lamp panel 21 and the light emitting unit 212 is the same, and the distance between the second reflector and the display panel is the same, so that the light reflection effect on the lamp panel 21 and at the joint is the same.

In other alternative embodiments, each of the lamp panels 21 further includes a plurality of light source driving chips and a converter. A plurality of light source driving chips are arranged on one side of the printed circuit board 211 close to the back plate 1, and each light source driving chip controls at least one light emitting unit 212 to emit light; the converter is arranged on one side of the printed circuit board 211 close to the back panel 1, and is connected with a backlight driver board 26 arranged on one side of the back panel 1 far away from the lamp panel assembly 2 through a Flexible Flat Cable (FFC).

As shown in fig. 7, in a specific embodiment, each lamp panel assembly is formed by splicing 6 lamp panels 21, each lamp panel 21 is provided with 720 Mini LEDs, and each 6 Mini LED is provided as one partition, which is 120 partitions in total. Each lamp panel 21 is provided with 4 light source driving chips 24, and 720 Mini LEDs in 120 partitions are controlled by the 4 light source driving chips 24. The light source driving chip 24 is connected with the converter through the first printed circuit board 211, only one converter is arranged on each lamp panel 21, and each converter is connected with the backlight driving board 26 through one flexible flat cable 25, so that the integrated design of the lamp driver is realized. Through the integrative integrated design of lamp driver, saved the quantity of being qualified for the next round of competitions for every lamp plate 21 only need a flexible flat cable 25 can, also reduced the drive plate size of converter simultaneously, and then reduced the holistic cost of lamp plate.

Optionally, light source driver chip 24 with set up heat conduction silica gel between the lamp plate 21 to dispel the heat for light source driver chip 24 through heat conduction silica gel, avoid causing the luminance and the chroma sound production skew of lamp plate 21 because of light source driver chip 24 generates heat.

In other alternative embodiments, the lamp panel 21 is fastened to the backboard 1 by screws, so that the lamp panel 21 is easy to detach; the lamp panel 21 is fixed with the sticky tape all around to prevent lamp panel 21 warpage. As shown in fig. 8, each lamp panel 21 is fixed on the back panel 1 by 9 screws 213.

Optionally, a second supporting structure is arranged between the lamp panel 21 and the back panel 1. As shown in fig. 9, the second support structure includes an umbrella cap, a support portion connected with the umbrella cap, and a fixing portion connected with the support portion. Lamp plate 21 and backplate 1 all carry out the design of punching, and lamp plate 21 installs between umbrella hat and supporting part during the installation, and the fixed part of second bearing structure inserts the hole on backplate 1 and realizes the fixed with backplate 1, can fix lamp plate 21 on the one hand like this and avoid lamp plate 21 to drop from backplate 1, can avoid lamp plate 21 to sink simultaneously and lead to the display frame to produce the shadow. As shown in fig. 10, in this embodiment, each lamp panel assembly 2 adopts 12 second support structures to support, and 6 are placed altogether to two lamp panels 21 that are located the intermediate position of lamp panel assembly 2 to lamp panel 21 that can avoid the intermediate position sinks.

In other alternative embodiments, as shown in fig. 11, the backlight module further includes an optical film layer 6. Optics rete 6 set up in lamp plate subassembly 2 keeps away from one side of backplate, and is fixed in glue on the frame 3. The rubber frame 3 comprises a first supporting platform and a second supporting platform which are arranged in a ladder manner, and the distance between the first supporting platform and the backboard 1 is greater than the distance between the second supporting platform and the backboard 1; the optical film layer 7 is disposed on the first supporting table, and the second supporting table is used for fixing the diffusion plate 5.

In this embodiment, the plastic frame 3 is used for supporting the display panel 7 and the optical film layer 6. The optical film 6 is disposed on a side of the display panel 7 close to the back plate 1, and a high-brightness and high-uniformity surface light source can be provided for the display panel 7 through the lamp panel assembly 2, the optical film 6, the diffusion plate 5, and other structures. The optical film layer 6 may include a diffusion film, a reflection sheet, and a brightness enhancement film, wherein the diffusion film and the reflection sheet are used for enhancing the light-emitting uniformity of the surface light source, and the brightness enhancement film is used for enhancing the light-emitting brightness of the backlight source. The distance between the optical film layer 6 and the rubber frame 3 is 0.5mm, so that the rubber frame 3 can be prevented from being extruded by expansion folds of the film layer material. The terminal surface of optics rete 6 sets up the shading rete to shelter from the emergent light of the terminal surface of optics rete 6, simultaneously, set up black bubble celloidin layer 41 between frame 4 and the display panel 7, thereby can further shelter from the emergent light of the terminal surface of optics rete 6. Therefore, emergent light does not exist on the end face of the optical film layer 6, and the problem that light rays are transmitted out through a gap between the display panel 7 and the frame 4 to cause module bright edges is avoided. Optionally, the diffuser plate 5 is fixed on the second support table of the rubber frame 3 through a rubber strip.

Optionally, a second reflector plate is arranged on one side of the lamp panel facing the optical film layer 6, and the second reflector plate is provided with a hole for exposing the light emitting unit; the distance between the second reflecting sheet and the optical film layer is 12mm, namely the light mixing distance (OD) is 12 mm.

Based on the same invention concept, an embodiment of the present disclosure further provides a tiled display device, including a display panel and the backlight module according to any of the above embodiments, where the display panel is formed by at least two sub-display panels tiled together.

Optionally, in this embodiment, the sub display panel may be a liquid crystal display panel. The liquid crystal display panel is made of a glass substrate with the thickness of 0.7 mm. The COF is side-bonded on a single side of the display panel.

As shown in fig. 12 and 13, the tiled display device includes a flexible printed circuit 71 and a second printed circuit 72. One end of the flexible circuit board 71 is connected with the sub-display panel, and a panel driving chip 73 is arranged on the flexible circuit board 71; one end of the second printed circuit board 72 is connected with the other end of the flexible circuit board 71, and the other end of the second printed circuit board 72 is connected with a panel driving unit arranged on one side of the lamp panel assembly 2 far away from the backboard 1.

Alternatively, as shown in fig. 13, the flexible wiring board 71 includes a trapezoidal portion and a rectangular portion. The lower bottom of the trapezoid part is laterally bound with the sub-display panel. Specifically, as shown in fig. 14, the trapezoidal portion of the flexible wiring board 71 is bound to one end of the sub display panel and bound to the edge of the sub display panel on the side away from the rear panel 1. The upper bottom of the trapezoid part is connected with one end of the rectangular part, and the other end of the rectangular part is connected with the second printed circuit board. The trapezoid part can release stress during COF binding (Bonding), and poor binding is reduced.

Optionally, the length of the second printed circuit board 72 is smaller than the length of the sub-display panel, so that more assembly space can be reserved for locking the frame 4, and the fixing strength of the frame 4 is ensured. Meanwhile, the second printed circuit board comprises a multilayer board, namely the second printed circuit board is designed by adopting an extremely narrow multilayer board, and the width of the second printed circuit board is only 13mm, so that the interference of signals on the second printed circuit board can be avoided.

In some alternative embodiments, as shown in fig. 14, on the data line bonding side (DP) of the display panel, the thickness c of the frame 4 is 0.3mm, the distance between the display panel and the frame 4 is 0.2mm, and the width of the front side of the frame is 2.13 mm. As shown in fig. 15, on the opposite side (DPO) of the data line bonding area of the display panel, the frame thickness f is 0.3mm, the distance between the display panel and the frame 4 is 0.2mm, and the width of the frame front side is 0.97 mm. When the DP side of one sub-display panel is tiled with the DPO side of another sub-display panel, the tiling of the tiled display device is 2.13+0.2+0.3+0.97+0.2+ 0.3-4.1 mm.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the present disclosure, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made without departing from the spirit or scope of the embodiments of the present disclosure are intended to be included within the scope of the disclosure.

Claims (16)

1. A backlight module, comprising:

a back plate;

the lamp panel assembly is arranged on the back plate and formed by splicing at least two lamp panels arranged on the same plane; the utility model discloses a lamp plate, including lamp plate, first supporting structure, back plate, adjacent two piece department between the lamp plate sets up first bearing structure, first bearing structure keeps away from one side of back plate sets up first reflector plate.

2. The backlight module of claim 1, further comprising:

glue the frame, with backplate edge connection and with the backplate forms and is used for holding lamp plate assembly's the chamber that holds, glue at least part of frame and be located lamp plate assembly keeps away from one side of backplate.

3. The backlight module according to claim 2, wherein each of the lamp panels comprises:

a first printed circuit board;

the array of the plurality of light-emitting units is arranged on one side of the first printed circuit board, which is far away from the back plate, and the brightness of the light-emitting units close to the rubber frame is greater than that of the light-emitting units far away from the rubber frame.

4. The backlight module according to claim 3, wherein the luminance of the light emitting unit close to the rubber frame is 5-50% greater than the luminance of the light emitting unit far from the rubber frame.

5. The backlight module according to claim 3, wherein the light emitting units comprise Mini LEDs.

6. The backlight module according to claim 3, wherein each of the lamp panels further comprises:

the light source driving chips are arranged on one side of the printed circuit board close to the back plate, and each light source driving chip controls at least one light-emitting unit to emit light;

the converter, set up in printed circuit board is close to one side of backplate, through flexible flat cable with set up in the backplate is kept away from the backlight drive plate of lamp plate subassembly one side is connected.

7. The backlight module according to claim 6, wherein a heat-conducting silica gel is arranged between the light source driving chip and the lamp panel.

8. The backlight module according to claim 1, wherein a second supporting structure is disposed between the lamp panel and the back plate.

9. A backlight module according to claim 3, further comprising:

the optical film layer is arranged on one side, away from the backboard, of the lamp panel assembly and fixed on the rubber frame.

10. The backlight module as claimed in claim 9, wherein the adhesive frame comprises a first supporting platform and a second supporting platform arranged in a step manner, and a distance between the first supporting platform and the back plate is greater than a distance between the second supporting platform and the back plate; the optical film layer is arranged on the first supporting table, and the second supporting table is provided with a diffusion plate.

11. The backlight module according to claim 10, wherein a second reflective sheet is disposed on a side of the lamp panel facing the optical film layer, and the second reflective sheet is provided with a hole for exposing the light emitting unit; the distance between the second reflecting sheet and the optical film layer is 12 mm.

12. The backlight module according to claim 1, wherein the first support structure comprises a light guide bar.

13. A tiled display arrangement comprising a display panel and a backlight module according to any of claims 1-12, wherein the display panel is formed by tiling at least two sub-display panels.

14. The tiled display arrangement according to claim 13, further comprising:

one end of the flexible circuit board is connected with the sub-display panel and is provided with a panel driving chip;

and one end of the second printed circuit board is connected with the other end of the flexible circuit board, and the other end of the second printed circuit board is connected with a panel driving unit arranged on one side of the lamp panel assembly and far away from the backboard.

15. The tiled display arrangement of claim 14 wherein the flexible circuit board comprises a trapezoidal portion and a rectangular portion; the lower bottom of the trapezoidal portion is laterally bound with the sub-display panel, the upper bottom of the trapezoidal portion is connected with one end of the rectangular portion, and the other end of the rectangular portion is connected with the second printed circuit board.

16. The tiled display arrangement of claim 14 wherein the second printed circuit board has a length less than the length of the sub-display panel and the second printed circuit board comprises a multi-layer board.

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