Backlight module and display device

Abstract

The present invention relates to a backlight module and a display device. The backlight module includes an optical plate, a light source and an optical film. The optical plate includes a light emitting surface, a bottom surface and a side surface, the bottom surface is opposite to the light emitting surface, and the side surface is connected between the light emitting surface and the bottom surface. The light source is arranged on the bottom surface or the side surface of the optical plate. The optical film is arranged above the light emitting surface. The optical film includes a main body and at least one refractive portion. The main body includes at least one end face, the refractive portion is arranged on the end face, and includes a plurality of micro structures. The sizes of the micro structures are substantially the same and are stacked in a lateral direction away from the end face with the end face as a reference, so that the refractive portion has a different thickness in the lateral direction relative to the end face, and the refractive index of the refractive portion is different from the refractive index of the main body, so that multiple light rays are deflected in different directions after passing through the refractive portion.

Description

Technical Field

[0001] The invention relates to a backlight module and a display device, and in particular to a backlight module capable of avoiding the formation of bright lines at edges and a display device comprising the backlight module. Background Art

[0002] With the advancement of technology, electronic devices equipped with liquid crystal display devices, such as mobile phones, tablets, laptops, etc., have become indispensable items in modern people's lives. Since liquid crystal itself does not emit light, liquid crystal display devices need to use a backlight module to provide light source.

[0003] Please refer to Figure 1 , which is a cross-sectional schematic diagram of a conventional backlight module 1. Since the light source 3 cannot be seen from this viewing angle, the light source 3 is drawn with a dotted line to present the relative position of the light source 3 and the optical plate 2. The backlight module 1 includes an optical plate 2, a light source 3, at least one optical film 5 and an outer frame 6. Here, the light source 3 is a light emitting diode (LED) light bar and includes a plurality of LEDs 4. Most of the light emitted by the LED 4 is uniformly emitted from the light emitting surface S1 of the optical plate 2 through the guidance of the optical plate 2. However, a small number of light rays, such as the light ray L0, will be emitted from the side S2 of the optical plate 2, and after being reflected by the outer frame 6, will be emitted from the surface S4 of the optical film 5 through the end surface S3 of the optical film 5, and form a bright line at the edge E of the optical film 5, thereby affecting the image quality of the liquid crystal display device. Summary of the invention

[0004] The object of the present invention is to provide a backlight module and a display device to solve the above problems.

[0005] According to one embodiment of the present invention, a backlight module is provided, comprising an optical plate, a light source and an optical film. The optical plate comprises a light emitting surface, a bottom surface and a side surface, the bottom surface is opposite to the light emitting surface, and the side surface is connected between the light emitting surface and the bottom surface. The light source is arranged on the bottom surface or the side surface of the optical plate. The optical film is arranged above the light emitting surface, and the optical film comprises a body and at least one refractive portion. The body comprises a first surface, a second surface and at least one end surface, the second surface is opposite to the first surface, and at least one end surface is connected between the first surface and the second surface. At least one refractive portion is arranged on at least one end surface, and the refractive portion comprises a plurality of microstructures. The sizes of the plurality of microstructures are substantially the same and are stacked in a lateral direction away from the end surface with the end surface as a reference, so that the refractive portion has a different thickness in the lateral direction relative to the end surface, and the refractive index of the refractive portion is different from the refractive index of the body, so that multiple light rays are deflected in different directions after passing through the refractive portion.

[0006] According to another embodiment of the present invention, a backlight module is provided, comprising an optical plate, a light source and an optical film. The optical plate comprises a light emitting surface, a bottom surface and a side surface, the bottom surface is opposite to the light emitting surface, and the side surface is connected between the light emitting surface and the bottom surface. The light source is arranged on the bottom surface or the side surface of the optical plate. The optical film is arranged above the light emitting surface, and the optical film comprises a main body and at least one refractive portion. The main body comprises a first surface, a second surface and at least one end surface, the second surface is relative to the first surface, and at least one end surface is connected between the first surface and the second surface. At least one refractive portion is arranged on at least one end surface, and the refractive portion comprises a plurality of microstructures. The sizes of the plurality of microstructures are different, and the refractive index of the refractive portion is different from the refractive index of the main body, so that multiple light rays are deflected in different directions after passing through the refractive portion.

[0007] According to another embodiment of the present invention, a display device is provided, comprising the aforementioned backlight module and a display panel, wherein the display panel is disposed above the backlight module.

[0008] Compared with the prior art, the backlight module of the present invention can make multiple light rays deflect in different directions after passing through the refractive portion by setting at least one refractive portion on at least one end surface of the optical film, thereby avoiding the light rays being concentrated at the same position to produce bright lines, thereby achieving the effect of softening the light, thereby improving the image quality of the display device, and being conducive to application in frameless or narrow-frame display devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional schematic diagram of a conventional backlight module.

[0010] Figure 2 is a schematic exploded side view of a display device according to one embodiment of the present invention.

[0011] Figure 3 yes Figure 2 A magnified schematic diagram of area A in the middle.

[0012] Figure 4 yes Figure 2 Part A in the middle is an enlarged schematic diagram of another embodiment of the present invention.

[0013] Figure 5 is a schematic diagram of an optical film according to another embodiment of the present invention.

[0014] Figure 6 yes Figure 2 Schematic diagram of the three-dimensional decomposition of the backlight module.

[0015] Figure 7 is a schematic cross-sectional view of a display device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0016] The above and other technical contents, features and effects of the present invention will be clearly presented in the detailed description of the preferred embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, back, bottom, top, etc., refer only to the directions shown in the accompanying drawings. Therefore, the directional terms used are only used to illustrate and not to limit the present invention. In addition, in the following embodiments, the same or similar elements will be marked with the same or similar reference numerals.

[0017] In the present invention, two elements being substantially parallel means that there is an angle between the two elements, and the angle is 0 degrees ± 10 degrees, preferably 0 degrees ± 5 degrees, and more preferably 0 degrees ± 3 degrees, or the angle is 180 degrees ± 10 degrees, preferably 180 degrees ± 5 degrees, and more preferably 180 degrees ± 3 degrees.

[0018] In the present invention, the backlight module can be used to provide a light source for a liquid crystal display (LCD) panel. Each component in the backlight module includes a bottom surface and a top surface. The bottom surface and the top surface are defined with reference to the LCD panel. The side of each component away from the LCD panel is the bottom surface, and the side facing the LCD panel is the top surface. In addition, in the present invention, a component is disposed above another component, which means that it is disposed on the top surface of the other component or above the top surface of the other component.

[0019] Please refer to Figure 2 , which is a side exploded schematic diagram of a display device 10 according to an embodiment of the present invention. The display device 10 includes a backlight module 30 and a display panel 20, and the display panel 20 is disposed above the backlight module 30. The backlight module 30 is used to provide light to the display panel 20, and the display panel 20 can be an LCD panel.

[0020] The backlight module 30 includes an optical plate 100 , a light source 200 and an optical film 300 . The optical plate 100 includes a light emitting surface 110 , a bottom surface 120 and a side surface 130 . The bottom surface 120 is opposite to the light emitting surface 110 , and the side surface 130 is connected between the light emitting surface 110 and the bottom surface 120 .

[0021] The light source 200 can be disposed on the bottom surface 120 or the side surface 130 of the optical plate 100, that is, the backlight module 30 can be a direct-type backlight module or an edge-type backlight module. Here, the light source 200 is disposed on the side surface 130 of the optical plate 100, that is, the backlight module 30 is an edge-type backlight module. The light source 200 can be, but is not limited to, a cold cathode fluorescent lamp (CCFL) or an LED light bar. Here, the LED light bar is used as an example, and the LED light bar includes a plurality of LEDs 210.

[0022] The optical film 300 is disposed above the light emitting surface 110 of the optical plate 100. The optical film 300 includes a body 310 and at least one refractive portion 320. Figure 6 , which is Figure 2 Schematic diagram of a three-dimensional decomposition of the backlight module 30. The body 310 includes a first surface 311, a second surface 312, a first end surface 313, a second end surface 314, a third end surface 315 and a fourth end surface 316. The second surface 312 is opposite to the first surface 311, and the first end surface 313, the second end surface 314, the third end surface 315 and the fourth end surface 316 are respectively connected between the first surface 311 and the second surface 312. The first end surface 313 is opposite to the third end surface 315, the second end surface 314 is opposite to the fourth end surface 316 and is connected between the first end surface 311 and the third end surface 315, and the first end surface 313 faces the light source 200. Here, it is taken as an example that the number of the refractive portion 320 is one and it is arranged on the second end surface 314.

[0023] Please refer to Figure 3 , which is Figure 2 The enlarged schematic diagram of the A part in the middle is for the convenience of explanation. Figure 3 The description is made with reference to the XYZ rectangular coordinate system, wherein the X direction is perpendicular to the paper and outward, the first surface 311 of the body 310 in the optical film 300 is parallel to the XY plane, and the second end surface 314 is parallel to the XZ plane. In this embodiment, the refractive portion 320 includes a plurality of microstructures 321, and the plurality of microstructures 321 are stacked in a lateral direction D1 away from the second end surface 314 with the second end surface 314 as a reference, and the lateral direction D1 is parallel to the Y direction. The refractive portion 320 has different thicknesses (i.e., different Y coordinates) relative to the second end surface 314 in the lateral direction D1, such as thicknesses T1 and T2, and the refractive index of the refractive portion 320 is different from the refractive index of the body 310, so that multiple light rays (such as light rays L1, L2, and L3) are deflected in different directions after passing through the refractive portion 320. For example, the structure in which the refractive portion 320 has different thicknesses relative to the second end surface 314 in the lateral direction D1 can be formed by stacking microstructures 321 of the same or different sizes.

[0024] exist Figure 3In the embodiment, under the premise that the size of the microstructures 321 is substantially the same, the refractive part 320 can have different thicknesses in the lateral direction D1, such as thicknesses T1 and T2, by means of the stacking method of the microstructures 321. Thus, the optical paths of the multiple light rays at different thicknesses in the refractive part 320 are different, which is conducive to the multiple light rays being emitted at different positions. Taking the light rays L1 and L2 as examples, the optical path of the light ray L1 in the refractive part 320 is the straight-line distance from point P1 to point P2, and the optical path of the light ray L2 in the refractive part 320 is the straight-line distance from point P3 to point P4. The optical path of the light ray L2 in the refractive part 320 is greater than the optical path of the light ray L1 in the refractive part 320. Furthermore, since the refractive indexes of the refractive part 320 and the body 310 are different, compared with the optical film (not shown) without the refractive part 320, when the light ray passes through the refractive part 320 and the body 310, the light ray will have one more chance to be deflected. Taking the light L2 as an example, when the light L2 enters the refractive part 320 from the air through point P3, it will first be deflected for the first time. When the light L2 enters the body 310 from the refractive part 320 through point P4, it will be deflected for the second time. When the light L2 enters the air from the body 310 through point P5, it will be deflected for the third time. If the optical film without the refractive part 320 is provided, the light will be deflected for the first time when it enters the body 310 from the air, and will be deflected for the second time when it enters the air from the body 310. Therefore, the present invention can increase the number of light deflections by means of the design of different refractive indexes of the refractive part 320 and the body 310, and can further disperse the positions where multiple light rays are emitted, so as to avoid the light rays being concentrated at the same position to generate bright lines, thereby achieving the effect of softening the light, thereby improving the image quality of the display device 10, and facilitating the configuration of the display device 10 as a narrow frame.

[0025] Please refer to Figure 4 , which is Figure 2 The enlarged schematic diagram of the A part in the middle according to another embodiment of the present invention, Figure 3 , Figure 4 The same description is based on the XYZ rectangular coordinate system. Figure 3 In the present embodiment, the sizes of the plurality of microstructures 321 are different. For example, the plurality of microstructures 321 have at least two or more sizes. For the spherical microstructures 321 of different sizes, the curvature of their spherical surfaces can cause a plurality of light rays (such as light rays L4, L5, and L6) to be deflected in different directions after passing through the refractive portion 320.

[0026] like Figure 4As shown, based on the different sizes of the microstructures 321, the refractive portion 320 is stacked with different thicknesses, such as thicknesses T3 and T4, in the lateral direction D1 away from the second end surface 314 with the second end surface 314 (i.e., the XZ plane). As a result, the optical paths of the multiple light rays in the refractive portion 320 are different. For example, the optical path of the light ray L5 in the refractive portion 320 is greater than the optical path of the light ray L4 in the refractive portion 320, which is conducive to the multiple light rays being emitted from different positions. Furthermore, since the refractive index of the refractive portion 320 is different from that of the main body 310, when the light passes through the refractive portion 320 and the main body 310, the number of light deflections can be increased. For details, please refer to Figure 3 In addition, the refractive indexes of microstructures 321 of different sizes can also be different, which can increase the random number of light deflection to avoid the light being concentrated at the same position and producing bright lines, thereby achieving the effect of softening the light. Figure 4 In the embodiment, the stacking method of the microstructure 321 can also be adjusted to adjust the thickness of the refractive portion 320 along the lateral direction D1. In this embodiment, the refractive index of the body 310 can be 1 to 3, and the refractive index of the refractive portion 320 can be 1 to 3. In summary, by means of the size change of the microstructure 321 or the same size but different stacking methods, the thickness of the refractive portion 320 on the XZ plane can be changed, the number of light deflections is increased, and the light is prevented from being concentrated at the same position to produce bright lines, thereby achieving the effect of softening the light.

[0027] like Figure 3 and Figure 4 As shown, the refractive portion 320 may further include a substrate 322, and the microstructures 321 are dispersed on the substrate 322. The substrate 322 may be an adhesive, which is used to adhere the microstructures 321 to the second end surface 314. In the present embodiment, although the substrate 322 is used as the adhesive, in other embodiments, the substrate 322 may not be used, and the microstructures 321 may be directly attached to the second end surface 314. Therefore, the embodiment is not limited to the embodiment in which the substrate 322 is required. The refractive index of the substrate 322 is further described below. The refractive index of the substrate 322 and the microstructure 321 may be the same or different. When the refractive index of the substrate 322 and the microstructure 321 are different, this is conducive to increasing the number of light deflections, and can further enhance the effect of dispersing light, so as to Figure 3 For example, light L3 enters the microstructure 321 from point P6 in the air and undergoes the first deflection, enters the substrate 322 from point P7 in the microstructure 321 and undergoes the second deflection, enters the microstructure 321 from point P8 in the substrate 322 and undergoes the third deflection, enters the body 310 from point P9 in the microstructure 321 and undergoes the fourth deflection, and enters the air from point P10 in the body 310 and undergoes the fifth deflection. Similarly, Figure 4In the figure, the light L6 passes through the substrate 321, so the number of its deflection is greater than the number of deflection of the light L4 and L5.

[0028] The microstructure 321 has a light-transmitting property. The material of the microstructure 321 may be, for example, titanium dioxide (TiO2), silicon dioxide (SiO2), tantalum pentoxide (Ta2O5), polymethyl methacrylate (PMMA) or a combination thereof. The microstructure 321 may be micron particles, nanoparticles or a combination thereof. For example, the size of the microstructure 321 may be, but is not limited to, 0.1 μm to 20 μm. The shape of the microstructure 321 is illustrated as a sphere here. Since the normal direction of each point on the sphere changes along the sphere, this is conducive to changing the direction of travel of multiple light rays. Figure 3 Taking the light rays L1 and L2 as an example, the directions of travel of the light rays L1 and L2 before entering the refractive portion 320 are substantially parallel. However, since the positions of the light rays L1 and L2 entering the microstructure 321 are different (i.e., the position of point P1 on the spherical surface is different from the position of point P3 on the spherical surface), the incident angles of the light rays L1 and L2 entering the microstructure 321 are different, which in turn affects the subsequent deflection angle. In other embodiments, the microstructure 321 can be configured as a polyhedral structure of other shapes, such as a cube, a cuboid, etc. Different planes can provide different normal directions. When multiple parallel light rays are incident on different planes, different incident angles can also be formed, which is also conducive to changing the travel directions of the multiple light rays. The shape of the microstructure 321 is a solid particle here. However, in other embodiments, the microstructure 321 can be configured as other forms. For example, the microstructure 321 can be a hollow particle, a composite particle, or a combination thereof. The aforementioned hollow particles (not shown) may include a hollow portion (refractive index of air = 1) and a shell portion (refractive index > 1), and the material of the shell portion may be TiO2, SiO2, Ta2O5, a resin such as PMMA, or a combination thereof. The aforementioned composite particles (not shown) may be, but are not limited to, a core-shell structure, and the core-shell structure may include a core portion and a shell portion, and the material of the core portion may be TiO2, SiO2, Ta2O5, and the material of the shell portion may be a resin such as PMMA, or the materials of the core portion and the shell portion may be different resins, respectively. Thus, the microstructure 321 itself can provide two different refractive indices, which can further enhance the effect of dispersing light.

[0029] Please refer to Figure 7 , which is a cross-sectional schematic diagram of a display device 10' according to another embodiment of the present invention. Since the light source 200 cannot be seen from this viewing angle, the light source 200 is depicted with a dotted line to show the relative position of the light source 200 and the optical plate 100. Figure 2The difference between the display device 10 and the display device 10 is that the backlight module 30' further includes a frame 400, and the frame 400 includes a back plate 410 and a side wall 420, and the side wall 420 is arranged around the back plate 410. The back plate 410 carries the optical plate 100, the light source 200 and the optical film 300, and the top 424 of the side wall 420 is used to carry the display panel 20, and the side wall 420 does not shield the top surface T of the optical film 300. In other words, the display device 10' is a frameless display device. By increasing the number of deflections of the light reflected from the frame 400 after passing through the refraction portion 320, it is possible to avoid the light being concentrated at the same position to generate bright lines. Therefore, there is no need to use the side wall 420 to shield the top surface T of the optical film 300 to block the bright lines, and the display device 10' can be configured as a frameless display device.

[0030] exist Figure 7 In the figure, the inner surface 423 of the side wall 420 includes a first area 421 and a second area 422. To clearly distinguish the two, different dot patterns are used here. The first area 421 corresponds to the optical film 300, and the second area 422 corresponds to the optical plate 100. The surface roughness of the first area 421 may be greater than the surface roughness of the second area 422 and / or the reflectivity of the first area 421 may be less than the reflectivity of the second area 422. In other words, for the first area 421, the characteristic of lower reflectivity can ensure that less light is reflected to the optical film 300, while the characteristic of higher roughness can ensure that the direction of the reflected light has a higher degree of disorder. Thus, it can be ensured that the inner surface 423 of the side wall 420 can reflect the light back to the optical plate 100 for reuse, while avoiding the light from being concentrated on the optical film 300, which can further enhance the effect of softening the light.

[0031] Please refer again Figure 2 and Figure 6 In this embodiment, the optical film 300 includes only one refractive portion 320, and is disposed on the second end surface 314, however, the present invention is not limited thereto. In other embodiments, when the light source is also disposed on the side of the optical plate and corresponds to the first end surface of the optical film, the backlight module may preferably include two refractive portions, which are respectively disposed on the second end surface and the fourth end surface; or, the backlight module may include only one refractive portion, which is disposed on the first end surface or the third end surface; or, the backlight module may also include three refractive portions, which are respectively disposed on the second end surface, the third end surface and the fourth end surface. In other words, the number and / or the location of the refractive portion may be adaptively adjusted according to actual needs, such as the configuration of each optical element in the backlight module and the optical performance required by the backlight module. Furthermore, in this embodiment, the backlight module 30 is illustrated as including the optical film 300. In other embodiments, the backlight module 30 may include a plurality of optical films, and at least one of the plurality of optical films may be provided with a refractive portion.

[0032] Please refer to Figure 5 , which is a schematic diagram of an optical film sheet 300' according to another embodiment of the present invention. Different from the optical film sheet 300, the refraction portion 320 of the optical film sheet 300' has a first extension portion 320a and a second extension portion 320b. The first extension portion 320a extends from the second end face 314 to the first surface 311 of the main body 310, and the second extension portion 320b extends from the second end face 314 to the second surface 312 of the main body 310. Thus, the light reflected by the frame (not shown in the figure) can be deflected when passing through the refraction portion 320 located at the second end face 314, and then can pass through the first extension portion 320a and / or the second extension portion 320b. This is beneficial to increasing the number of times of light deflection, and can further improve the effect of dispersing light. In one embodiment, the length of the first extension portion 320a parallel to the lateral direction D1 is M1, which can satisfy the following conditional formula: 0 < M1 ≤ 2 mm. The length of the second extension portion 320b parallel to the lateral direction D1 is M2, which can satisfy the following conditional formula: 0 < M2 ≤ 2 mm. M2 can be the same as or different from M1. In another embodiment, either the first extension portion 320a or the second extension portion 320b can be selectively provided according to requirements to solve the bright line problem caused by the reflected light from other components such as the upper rubber frame or the lower optical plate.

[0033] Compared with the prior art, by providing at least one refraction portion at at least one end face of the optical film sheet, the backlight module of the present invention can deflect multiple light rays in different directions after passing through the refraction portion, avoid the light rays from concentrating at the same position to generate bright lines, and can achieve the effect of softening the light rays. Furthermore, it can improve the image quality of the display device and is beneficial to be applied to display devices without a rubber frame or with a narrow frame.

[0034] The above are only the preferred embodiments of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

[0035]

List of Reference Numerals

[0036] 1, 30, 30': Backlight module

[0037] 2, 100: Optical plate

[0038] 3, 200: Light source

[0039] 4, 210: LED

[0040] 5, 300, 300': Optical film sheet

[0041] 6: Outer frame

[0042] 10, 10': Display device

[0043] 20: Display panel

[0044] S1, 110: light emitting surface

[0045] 120: Bottom

[0046] S2, 130: Side

[0047] 310: Ontology

[0048] 311: First surface

[0049] 312: Second surface

[0050] 313: First end face

[0051] 314: Second end face

[0052] 315: The third end face

[0053] 316: Fourth end face

[0054] 320: Refraction

[0055] 321: Microstructure

[0056] 322: Base material

[0057] 320a: First extension

[0058] 320b: Second extension

[0059] 400: Framework

[0060] 410: Back panel

[0061] 420: Sidewall

[0062] 421: First Area

[0063] 422: Second Area

[0064] 423: Inner surface

[0065] 424: Top

[0066] A: Location

[0067] D1: Lateral direction

[0068] E: Edge

[0069] L0, L1, L2, L3, L4, L5, L6: light

[0070] P1, P2, P3, P4, P5, P6, P7, P8, P9, P10: Point

[0071] S3: End face

[0072] S4: Surface

[0073] T: Top

[0074] T1, T2, T3, T4: thickness

[0075] M1, M2: length.

Claims

1. A backlight module, characterized in that: It contains: An optical plate comprising: Bright surface; a bottom surface, which is opposite to the light emitting surface; and A side surface connected between the light emitting surface and the bottom surface; a light source disposed on the bottom surface or the side surface of the optical plate; and An optical film is disposed above the light emitting surface, and the optical film comprises: The body, which contains: a first surface; a second surface opposite to the first surface; and at least one end surface connected between the first surface and the second surface; as well as at least one refractive portion, which is disposed on the end surface, and the refractive portion includes a plurality of microstructures; The sizes of the multiple microstructures are substantially the same and are stacked in a lateral direction away from the end surface with the end surface as a reference, so that the refractive portion has a different thickness relative to the end surface in the lateral direction, and the refractive index of the refractive portion is different from the refractive index of the main body, so that multiple light rays are deflected in different directions after passing through the refractive portion.

2. A backlight module, characterized in that: It contains: An optical plate comprising: Bright surface; a bottom surface, which is opposite to the light emitting surface; and A side surface connected between the light emitting surface and the bottom surface; a light source disposed on the bottom surface or the side surface of the optical plate; and An optical film is disposed above the light emitting surface, and the optical film comprises: The body, which contains: a first surface; a second surface opposite to the first surface; and at least one end surface connected between the first surface and the second surface; as well as at least one refractive portion, which is disposed on the end surface, and the refractive portion includes a plurality of microstructures; The sizes of the plurality of microstructures are different, and the refractive index of the refractive portion is different from the refractive index of the body, so that a plurality of light rays are deflected in different directions after passing through the refractive portion.

3. The backlight module according to claim 2, characterized in that: The refractive portion has different thicknesses in a lateral direction from the end surface toward a direction away from the end surface.

4. The backlight module according to claim 1 or 2, characterized in that: The refractive portion has a first extending portion extending from the end surface to the first surface of the body.

5. The backlight module according to claim 4, characterized in that: The refractive portion further has a second extending portion extending from the end surface to the second surface of the body.

6. The backlight module according to claim 1 or 2, characterized in that: The refractive part further includes a substrate, and the plurality of microstructures are dispersed in the substrate.

7. The backlight module according to claim 1 or 2, characterized in that: The plurality of microstructures are microparticles, nanoparticles or a combination thereof.

8. The backlight module according to claim 1 or 2, characterized in that: The plurality of microstructures are hollow particles, composite particles or a combination thereof.

9. The backlight module according to claim 1 or 2, characterized in that: The material of the plurality of microstructures is titanium dioxide, silicon dioxide, tantalum pentoxide, polymethyl methacrylate or a combination thereof.

10. The backlight module according to claim 1 or 2, characterized in that: The light source is arranged on the side surface of the optical plate, and the number of the end surfaces is four, which are the first end surface, the second end surface, the third end surface and the fourth end surface, the first end surface is opposite to the third end surface, the second end surface is opposite to the fourth end surface and is connected between the first end surface and the third end surface, and the first end surface faces the light source.

11. The backlight module according to claim 10, characterized in that: The number of the refractive parts is two, and they are respectively arranged on the second end surface and the fourth end surface.

12. The backlight module according to claim 10, characterized in that: The refractive portion is disposed on the first end surface or the third end surface.

13. The backlight module according to claim 10, characterized in that: The number of the refractive parts is three, which are respectively arranged on the second end surface, the third end surface and the fourth end surface.

14. The backlight module according to claim 1 or 2, characterized in that: Also includes: Framework, including: Back panel; and A side wall, which is arranged around the back plate; Wherein, the back plate carries the optical plate, and the side wall does not cover the top surface of the optical film.

15. The backlight module according to claim 14, characterized in that: The inner surface of the side wall includes a first area and a second area, the first area corresponds to the optical film, the second area corresponds to the optical plate, and the surface roughness of the first area is greater than that of the second area.

16. The backlight module according to claim 14, characterized in that: The inner surface of the side wall includes a first area and a second area, the first area corresponds to the optical film, the second area corresponds to the optical plate, and the reflectivity of the first area is less than the reflectivity of the second area.

17. A display device, characterized in that: Include: The backlight module according to any one of claims 1 to 16; and The display panel is arranged above the backlight module.

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