Backlight module and display device

Abstract

The present invention relates to a backlight module and a display device. The backlight module includes: a plurality of light-emitting units and a light guide plate. In each light-emitting unit, the light-emitting unit includes a circuit board and a plurality of LED lamp beads. The LED lamp beads are respectively arranged on the circuit board. The light-emitting direction of each LED lamp bead is parallel to the circuit board. The light guide plate is arranged on a side of the circuit board close to the LED lamp bead. The light guide plate is provided with a plurality of avoidance grooves. By providing a plurality of light-emitting units and light guide plates, each light-emitting unit can be individually controlled by a circuit. By setting the light-emitting direction of each LED lamp bead to be parallel to the circuit board, side lighting is achieved. The light emitted by the LED lamp bead can be directly guided out through the light guide plate, avoiding the need to stack the light guide plate above the light-emitting unit. The resulting backlight module is light and thin, emits light uniformly, has a good light-emitting effect, and each light-emitting unit is adjustable to achieve local light control, which facilitates the subsequent preparation of a display device with better display effect.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and particularly relates to a backlight module and a display device. Background Art

[0002] The backlight module is one of the key components of a display device. The backlight module is used to provide a light source with sufficient brightness and uniform distribution, so that the display device can display images normally. It is an essential component of the display device. The backlight module includes a side-entry backlight module and a direct-lit backlight module. Specifically, the side-entry backlight module refers to a backlight module in which the lamp beads are arranged around a specific electronic product, usually the lamp beads are arranged on both sides or the bottom of the specific electronic product, while the direct-lit backlight module arranges the lamp beads on the back of the specific electronic product. The direct-lit backlight module has uniform light emission, but the cost is also relatively high.

[0003] However, the existing direct-lit backlight module has the advantage of more uniform light emission, which is beneficial to improving the quality of the prepared electronic products. However, since the light source and the light guide plate are arranged overlapping each other, it will cause an increase in the thickness of the overall product structure prepared, which does not conform to the development trend of the thin and light of electronic products and cannot meet the higher consumption needs of people. Therefore, it is necessary to provide a backlight module and a display device that are thin and light and have good light-emitting effects. Summary of the Invention

[0004] Based on this, it is necessary to provide a backlight module and a display device.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A backlight module includes:

[0006] A plurality of light-emitting units, each of the light-emitting units is arranged adjacent to each other. In each of the light-emitting units, the light-emitting unit includes a circuit board and a plurality of LED lamp beads. Each of the LED lamp beads is respectively arranged on the circuit board, and the light-emitting direction of each of the LED lamp beads is parallel to the circuit board; and

[0007] A light guide plate, the light guide plate is arranged on a surface of each of the circuit boards close to the LED lamp beads, and the light guide plate is provided with a plurality of avoidance grooves, and each of the avoidance grooves is used to accommodate each of the LED lamp beads.

[0008] In one embodiment, the thickness of the light guide plate is greater than the height of each of the LED lamp beads.

[0009] In one embodiment, each of the LED lamp beads is a side-emitting LED lamp bead.

[0010] In one embodiment, each of the LED lamp beads is distributed in a circular shape.

[0011] In one embodiment, the LED lamp beads are distributed in a rectangular shape.

[0012] In one embodiment, the LED lamp beads include a first LED lamp bead, a second LED lamp bead, a third LED lamp bead and a fourth LED lamp bead. The first LED lamp bead, the second LED lamp bead, the third LED lamp bead and the fourth LED lamp bead are distributed in a rectangular shape in sequence. The light-emitting direction of the first LED lamp bead is parallel to the light-emitting direction of the third LED lamp bead. The first LED lamp bead and the third LED lamp bead are staggered. The light-emitting direction of the second LED lamp bead is parallel to the light-emitting direction of the fourth LED lamp bead. The second LED lamp bead and the fourth LED lamp bead are staggered.

[0013] In one embodiment, the light emitting units are distributed in a matrix shape.

[0014] In one embodiment, a surface of the circuit board facing the light guide plate is provided with a plurality of grooves, and a surface of the light guide plate facing the circuit board is provided with a plurality of protrusions, each of the protrusions being provided in one of the grooves.

[0015] In one embodiment, the light guide plate is a PMMA light guide plate or a PC light guide plate.

[0016] A display device includes: the backlight module described in any one of the above embodiments.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] The present invention sets a plurality of light-emitting units and light guide plates, and each light-emitting unit and the light guide plate correspond to form a complete backlight module. Each light-emitting unit can be controlled by a separate circuit, and each light-emitting unit can be adjusted. Specifically, each light-emitting unit includes a circuit board and a plurality of LED lamp beads. By setting the light-emitting direction of each LED lamp bead to be parallel to the circuit board, side lighting can be achieved. Then, by attaching the light guide plate to the circuit board, since the light guide plate is provided with an avoidance groove for avoiding each LED lamp bead, and the light guide plate is set parallel to the circuit board, the light emitted by the LED lamp bead can be directly guided out through the light guide plate. In this way, it can be avoided that the light guide plate is stacked above the light-emitting unit, which is beneficial to greatly reduce the thickness of the prepared backlight module. The obtained backlight module is light and thin, and emits light evenly and has a good light-emitting effect. Each light-emitting unit is adjustable, and local light control can be achieved, which is convenient for the subsequent preparation of a display device with better display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a backlight module according to an embodiment;

[0020] Figure 2Schematic diagram of a partial structure of a backlight module according to an embodiment;

[0021] Figure 3 Schematic diagram of a partial structure of a backlight module according to an embodiment;

[0022] Figure 4 Schematic diagram of a light-emitting unit and a light guide plate of a backlight module according to an embodiment. Detailed implementation manners

[0023] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The following will further describe the technical solutions of the present invention in conjunction with the drawings of the embodiments of the present invention. The present invention is not limited to the following specific implementation manners.

[0024] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] Please refer to Figure 1 , Figure 2 and Figure 4 , in an embodiment, a backlight module 10 is provided, which includes a plurality of light-emitting units 100 and a light guide plate 200. Each of the light-emitting units 100 is arranged adjacent to each other. In each of the light-emitting units 100, the light-emitting unit 100 includes a circuit board 110 and a plurality of LED lamp beads 120. Each of the LED lamp beads 120 is respectively arranged on the circuit board 110, and the light-emitting direction of each of the LED lamp beads 120 is parallel to the circuit board 110. The light guide plate 200 is arranged on the side of each of the circuit boards 110 close to the LED lamp beads 120, and the light guide plate 200 is provided with a plurality of avoidance grooves 201, and each of the avoidance grooves 201 is used to accommodate each of the LED lamp beads 120.

[0026] It should be noted that each light-emitting unit 100 is used for emitting light. It is electrically connected to an external power supply device through the outside to supply power to each light-emitting unit 100 to achieve light emission. The light guide plate 200 can be set to one or multiple. Specifically, when the light guide plate 200 is set to one, the shape of the light guide plate 200 is adapted to the shape after the arrangement and combination of each light-emitting unit 100. When the light guide plate 200 is set to multiple, the number of the light guide plates 200 can be adapted to the number of the light-emitting units 100, and the shapes are adapted. In this embodiment, the light guide plate 200 is set to multiple, and the light guide plate 200 is adapted to the number and shape of each light-emitting unit 100. Each light guide plate 200 is respectively arranged in one-to-one correspondence with each light-emitting unit 100 and is used for guiding out the light emitted by each light-emitting unit 100, so as to make the light emission uniform. By setting multiple light-emitting units 100 and multiple light guide plates 200, a complete backlight module is formed by the one-to-one correspondence between each light-emitting unit 100 and each light guide plate 200. The circuit of each light-emitting unit 100 can be controlled separately, and the adjustability of each light-emitting unit 100 can be realized. Specifically, in a light-emitting unit 100, a circuit board 110 and multiple LED lamp beads 120 are included. The circuit board 110 is provided with multiple pads, and each LED lamp bead 120 can be soldered to each pad through solder paste, so as to realize the electrical connection with the circuit board 110. The light-emitting surface of the LED lamp bead 120 is arranged perpendicular to the circuit board 110, so as to set the light-emitting direction of each LED lamp bead 120 to be parallel to the circuit board 110, and side light emission can be realized. Then, by attaching the light guide plate 200 to the circuit board 110, the light guide plate 200 is provided with multiple avoidance grooves 201, and each avoidance groove 201 is adapted to the shape and position of each LED lamp bead 120 and is used for avoiding each LED lamp bead 120. The light guide plate 200 is attached to the circuit board 110 and is arranged parallel to the circuit board 110. The light emitted by the LED lamp bead 120 can be directly guided out through the light guide plate 200, so as to realize uniform light emission. In this way, it is possible to avoid stacking the light guide plate 200 above the light-emitting unit 100, which is beneficial to greatly reducing the thickness of the prepared backlight module. The obtained backlight module is thin and light, with uniform light emission and good light-emitting effect. Each light-emitting unit 100 is adjustable, and local light control can be realized, which is convenient for preparing a display device with a better display effect subsequently.

[0027] Please refer to Figure 4In one embodiment, the thickness of the light guide plate 200 is greater than the height of each of the LED lamp beads 120. It is understandable that, since the LED lamp beads 120 have a certain light-emitting angle, by setting the thickness of the light guide plate 200 to be greater than the height of the LED lamp beads 120, the end surface of the light guide plate 200 can be made higher than the end surface of the LED lamp beads 120, thereby making the end surface of the light guide plate 200 higher than the light-emitting surface of the LED lamp beads 120. This helps ensure that the light emitted by the LED lamp beads 120 can be guided out through the light guide plate 200, thereby achieving uniform light emission, avoiding light leakage, and helping to improve light emission efficiency and achieve better light emission effects.

[0028] In order to avoid light leakage and prevent the backlight module from being too thick, thereby ensuring that the backlight module is thin and light, in one embodiment, the thickness of the light guide plate 200 is calculated as follows:

[0029] 0.05×(0.5×m-0.5×n)+m≤Q≤0.2×(0.5×m-0.5×n)+m

[0030] Wherein, Q is defined as the thickness of the light guide plate 200, m is defined as the height of the LED lamp bead 120, and n is defined as the width of the light-emitting surface of the LED lamp bead 120. It is understandable that, since the LED lamp bead 120 has a certain light-emitting angle, in order to avoid light leakage, it is necessary to accurately control the thickness of the light guide plate 200, so as to adapt to the specific different models of LED lamp bead 120, so that the thickness of the prepared backlight module is moderate, and light leakage is avoided, and the light-emitting effect is guaranteed. Specifically, since the model size of the LED lamp bead 120 is known, the height of the LED lamp bead 120 and the width of the light-emitting surface of the LED lamp bead 120 can be obtained. The edge width of the non-light-emitting surface of the LED lamp bead 120 can be calculated by 0.5×m-0.5×n. By setting the thickness of the light guide plate 200 at LE By increasing the edge width of the non-luminous surface of the LED lamp bead 120 by 0.05 to 0.2 times on the basis of the height of the D lamp bead 120 itself, the thickness of the light guide plate 200 can be accurately calculated and designed, so that the thickness of the light guide plate 200 can be moderate. While avoiding light leakage, the thickness of the light guide plate 200 can be avoided from being too thick, thereby ensuring the lightness and thinness of the prepared backlight module. In this way, the thickness of the light guide plate 200 can be quickly calculated according to the specific model of the LED lamp bead 120, and the thickness of the light guide plate 200 can be accurately calculated, thereby facilitating the rapid design of the matching model size of the light guide plate 200, ensuring the luminous effect, improving production efficiency, and being suitable for industrial production.

[0031] In one embodiment, each of the LED beads 120 is a side-emitting LED bead. It can be understood that each LED bead 120 adopts a side-emitting LED bead, and a side-emitting LED bead is an LED bead 120 with positive and negative electrode pads provided on its side wall. Specifically, the positive and negative electrode pads at the bottom of the side-emitting LED bead extend to the side wall of the bead, and the positive and negative electrode pads on the side wall of the side-emitting LED bead are perpendicular to the plane of the side-emitting LED bead. In this way, the side-emitting LED bead 120 can be welded to the circuit board 110 through the positive and negative electrode pads on its side wall, so that the side wall of the side-emitting LED bead is parallel to the circuit board, thereby making the light-emitting surface of the LED bead 120 perpendicular to the circuit board 110, and then making the light emitted by the LED bead 120 parallel to the circuit board, realizing side emission. The adoption of side-emitting LED beads for the LED beads 120 facilitates the installation of the LED beads 120 on the circuit board 110, is conducive to reducing the production difficulty, realizing industrial production, and improving production efficiency.

[0032] Please refer to Figure 1 , Figure 2 and Figure 4 , in order to improve the structural compactness of the backlight module and facilitate installation, in one embodiment, the shape of the light guide plate 200 is adapted to that of the circuit board 110, each LED bead 120 is arranged at the edge of the circuit board 110, and each avoidance groove 201 has an opening 201a. It can be understood that the shape of the light guide plate 200 is adapted to that of the circuit board 110, that is to say, the peripheral end faces of the light guide plate 200 are flush with the peripheral end faces of the circuit board 110. By arranging each LED bead 120 at the edge of the circuit board 110, each avoidance groove 201 is correspondingly opened at the edge of the light guide plate 200. In this way, the avoidance groove 201 can be set in a concave shape, the light-emitting direction of each LED bead 120 is set towards the bottom of the avoidance groove 201, and the avoidance groove 201 has an opening 201a, which can facilitate the heat generated by the LED bead 120 during light emission to be quickly exported to the external environment through the opening 201a, being conducive to improving the heat dissipation performance of the backlight module. That is to say, each LED bead 120 is arranged at the four peripheral edges of the circuit board 110, each avoidance groove 201 is correspondingly arranged at the four peripheral edges of the light guide plate 200, and the light-emitting direction of each LED bead 120 is towards the middle of the light guide plate 200. In this way, the light emitted by each LED bead 120 can be reflected by the light guide plate 200 and exported from the light guide plate 200, realizing the light output of the light-emitting unit 100, with uniform light-emitting effect, not easy to generate heat, and good heat dissipation effect.

[0033] In order to improve the light-emitting uniformity of the backlight module, in one embodiment, each of the LED beads 120 is circularly distributed. It can be understood that each of the LED beads 120 is circularly distributed, and the light-emitting direction of each LED bead 120 faces the center of the circle. In this way, light can be emitted uniformly in all directions around the circle and then be guided out by the light guide plate 200, resulting in more uniform light emission and better lighting effects.

[0034] In order to improve the light-emitting uniformity of the backlight module, in one embodiment, each of the LED beads 120 is rectangularly distributed. Similarly, by arranging each of the LED beads 120 in a rectangular distribution and setting the light-emitting direction of each LED bead 120 to face the central axis of the rectangle, light can be emitted uniformly from the four directions of the rectangle and then be guided out by the light guide plate 200, resulting in more uniform light emission and better lighting effects.

[0035] Please refer to Figure 2 and Figure 3, in one embodiment, the LED lamp beads 120 include a first LED lamp bead 121, a second LED lamp bead 122, a third LED lamp bead 123 and a fourth LED lamp bead 124. The first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 are sequentially distributed in a rectangular shape. The light-emitting direction of the first LED lamp bead 121 is parallel to the light-emitting direction of the third LED lamp bead 123, and the first LED lamp bead 121 and the third LED lamp bead 123 are staggeredly distributed. The light-emitting direction of the second LED lamp bead 122 is parallel to the light-emitting direction of the fourth LED lamp bead 124, and the second LED lamp bead 122 and the fourth LED lamp bead 124 are staggeredly distributed.It can be understood that in this embodiment, the circuit board 110 and the light guide plate 200 are both arranged in a rectangular shape. The first LED lamp beads 121, the second LED lamp beads 122, the third LED lamp beads 123, and the fourth LED lamp beads 124 are sequentially arranged at four adjacent edges on one side of the circuit board 110, so that the first LED lamp beads 121, the second LED lamp beads 122, the third LED lamp beads 123, and the fourth LED lamp beads 124 are distributed in a rectangular shape. That is to say, the first LED lamp beads 121 and the third LED lamp beads 123 are arranged opposite to each other, and the second LED lamp beads 122 and the fourth LED lamp beads 124 are arranged opposite to each other. In this way, the first LED lamp beads 121, the second LED lamp beads 122, the third LED lamp beads 123, and the fourth LED lamp beads 124 can emit uniform light from four directions of the circuit board 110, with uniform light emission and good effect. Further, in this embodiment, the first LED lamp beads 121 and the third LED lamp beads 123 are staggeredly distributed, and the second LED lamp beads 122 and the fourth LED lamp beads 124 are staggeredly distributed. On the one hand, it can prevent the light emitted by the first LED lamp beads 121 and the third LED lamp beads 123 from irradiating and overlapping with each other, so that the light emitted by the first LED lamp beads 121 and the third LED lamp beads 123 is staggeredly distributed, which is beneficial to improving the light emission efficiency and the light emission brightness of the prepared backlight module. On the other hand, since the light-emitting units 100 are arranged adjacent to each other, when arranging the light-emitting units 100, the first LED lamp beads 121 and the third LED lamp beads 123 on the adjacent light-emitting units 100 can be staggeredly distributed. Similarly, the second LED lamp beads 122 and the fourth LED lamp beads 124 on the adjacent light-emitting units 100 can be staggeredly distributed. In this way, since a large amount of heat will be generated when the first LED lamp beads 121, the second LED lamp beads 122, the third LED lamp beads 123, and the fourth LED lamp beads 124 emit light, making the surrounding temperature relatively high, and the first LED lamp beads 121, the second LED lamp beads 122, the third LED lamp beads 123, and the fourth LED lamp beads 124 are all staggeredly distributed, the overlapping phenomenon can be avoided, thereby avoiding the phenomenon of local overheating. That is to say, while ensuring the uniform light output effect, the heat dissipation performance of the backlight module can be greatly improved, which can play a better protective role for the first LED lamp beads 121, the second LED lamp beads 122, the third LED lamp beads 123, and the fourth LED lamp beads 124, and is beneficial to improving the service life of the first LED lamp beads 121, the second LED lamp beads 122, the third LED lamp beads 123, and the fourth LED lamp beads 124, and thus improving the service life of the backlight module.

[0036] Please refer to Figure 1 , in one embodiment, the light-emitting units 100 are distributed in a matrix. It can be understood that the light-emitting units 100 are distributed in a matrix, with a neat and regular arrangement, which is convenient for installation and is beneficial to improving the structural stability of the prepared backlight module.

[0037] In one embodiment, a plurality of grooves are provided on one side of the circuit board 110 facing the light guide plate 200, and a plurality of protrusions are provided on one side of the light guide plate 200 facing the circuit board 110, and each protrusion is disposed in one of the grooves. It can be understood that by providing a plurality of protrusions, the shapes and positions of the protrusions and the grooves are adapted to each other, so that the circuit board 110 and the light guide plate 200 can be snap-fitted through the one-to-one correspondence between the protrusions and the grooves, so as to achieve positioning and installation, prevent the light guide plate 200 from shifting, and thus prevent the light guide plate 200 from colliding with each LED lamp bead 120, thereby preventing the light guide plate 200 from damaging each LED lamp bead 120, which is beneficial to improving the service life of the backlight module.

[0038] In one embodiment, the protrusion is plum blossom-shaped, the cross-section of the groove is plum blossom-shaped, and the groove is adapted to the protrusion. It can be understood that by setting the protrusion to be plum blossom-shaped, the protrusion is set to a smooth petal-shaped structure. Correspondingly, the groove is also set to a plum blossom-shaped structure. In this way, when the protrusion and the groove are snap-fitted, the smooth petal structure can play a buffering role, avoiding hard contact between the light guide plate 200 and the circuit board 110. Thus, while ensuring that the light guide plate 200 and the circuit board 110 are better snap-fitted together, it can also prevent damage to the light guide plate 200 and the circuit board 110, playing a protective role for the light guide plate 200 and the circuit board 110, which is beneficial to improving the service life of the backlight module. At the same time, setting the protrusion to be plum blossom-shaped is beneficial to increasing the side wall surface area of the protrusion, and thus beneficial to increasing the contact area between the protrusion and the groove, and the snap-fitting effect is better.

[0039] In one embodiment, the light guide plate 200 is a PMMA (polymethyl methacrylate) light guide plate or a PC (Polycarbonate) light guide plate. It can be understood that both the PMMA light guide plate and the PC light guide plate are commonly used light guide plates 200, which have the characteristics of high transparency, good light guiding effect, good mechanical properties and high strength, which are beneficial to ensuring the structural stability of the prepared backlight module and improving the service life of the backlight module.

[0040] In one embodiment, a display device is further provided, including: the backlight module 10 described in any one of the above embodiments.

[0041] It should be noted that the display device further includes a liquid crystal screen and a power supply device. The power supply device is electrically connected to the circuit board and is used to provide electrical energy for the light emission of each LED lamp bead. The light emitted by the backlight module is projected onto the liquid crystal screen, thereby realizing the normal display function of the display device.

[0042] Compared with the prior art, the present invention has at least the following advantages:

[0043] By providing a plurality of light-emitting units and a light guide plate, a complete backlight module is correspondingly formed by each light-emitting unit and the light guide plate. Circuit control can be performed separately for each light-emitting unit, and each light-emitting unit can be adjusted. Specifically, in each light-emitting unit, a circuit board and a plurality of LED lamp beads are included. By setting the light-emitting directions of the LED lamp beads to be parallel to the circuit board, side light emission can be achieved. Then, by attaching the light guide plate to the circuit board, since the light guide plate is provided with avoidance grooves for avoiding the LED lamp beads, and the light guide plate is arranged parallel to the circuit board, the light emitted by the LED lamp beads can be directly exported through the light guide plate. In this way, it is possible to avoid stacking the light guide plate above the light-emitting unit, which is beneficial to greatly reducing the thickness of the obtained backlight module. The obtained backlight module is thin and light, has uniform light emission, good light-emitting effect, and each light-emitting unit can be adjusted, enabling local light control, which is convenient for subsequently preparing a display device with better display effect.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A backlight module, characterized in that, Comprising: A plurality of light-emitting units, each of the light-emitting units being arranged adjacent to each other. In each light-emitting unit, the light-emitting unit includes a circuit board and a plurality of LED beads, each of the LED beads being respectively arranged on the circuit board, the light-emitting direction of each LED bead being parallel to the circuit board, each LED bead being a side-emitting LED bead, and the light-emitting surface of each LED bead being perpendicular to the circuit board; and A light guide plate, the light guide plate being arranged on the surface of each circuit board close to the LED beads, the light guide plate being provided with a plurality of avoidance grooves, each avoidance groove being used for accommodating each LED bead; The thickness of the light guide plate is greater than the height of each LED bead, and the calculation steps of the thickness of the light guide plate are as follows: 0.05×(0.5×m - 0.5×n)+m ≤ Q ≤ 0.2×(0.5×m - 0.5×n)+m Wherein, Q is defined as the thickness of the light guide plate, m is defined as the height of the LED bead, and n is defined as the width of the light-emitting surface of the LED bead.

2. The backlight module according to claim 1, wherein Each of the LED beads is distributed in a circular shape.

3. The backlight module according to claim 1, wherein, Each of the LED beads is distributed in a rectangular shape.

4. The backlight module according to claim 3, wherein The LED beads include a first LED bead, a second LED bead, a third LED bead, and a fourth LED bead. The first LED bead, the second LED bead, the third LED bead, and the fourth LED bead are sequentially distributed in a rectangular shape. The light-emitting direction of the first LED bead is parallel to the light-emitting direction of the third LED bead, and the first LED bead and the third LED bead are staggeredly distributed. The light-emitting direction of the second LED bead is parallel to the light-emitting direction of the fourth LED bead, and the second LED bead and the fourth LED bead are staggeredly distributed.

5. The backlight module according to claim 1, wherein Each of the light-emitting units is distributed in a matrix.

6. The backlight module according to claim 1, wherein, A plurality of grooves are arranged on the surface of the circuit board facing the light guide plate, and a plurality of protrusions are arranged on the surface of the light guide plate facing the circuit board. Each protrusion is arranged in one of the grooves.

7. The backlight module according to any one of claims 1-6, characterized in that, The light guide plate is a PMMA light guide plate or a PC light guide plate.

8. A display device, characterized in that, Comprising: The backlight module according to any one of claims 1 to 7.

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