TWI799306B - Backlight module and display device - Google Patents

Abstract

A 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. The side surface is connected between the light-emitting surface and the bottom surface. The light source is disposed on the bottom surface or the side surface of the optical plate. The optical film is disposed above the light-emitting surface. The optical film includes a main body and at least one refractive part. The main body includes at least one end surface. The refractive part is disposed on the end surface and includes a plurality of microstructures. The microstructures have substantially identical sizes and are stacked from the end surface along a side direction away from the end surface to allow the refractive part to have different thicknesses relative to the end surface along the side direction, and a refractive index of the refractive part is different from a refractive index of the main body, such that a plurality of light rays are deflected toward different directions after passing through the refractive part.

Description

Backlight module and display device

The present 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 including the backlight module.

With the advancement of technology, electronic devices equipped with liquid crystal display devices, such as mobile phones, tablets, and notebook computers, have become indispensable items in modern people's lives. Since the liquid crystal itself does not emit light, the liquid crystal display device needs to use a backlight module to provide a light source.

Please refer to FIG. 1 , which is a schematic cross-sectional view of a conventional backlight module 1 . Since the light source 3 cannot be seen from this angle of view, the light source 3 is shown here with dotted lines to show the relative positions of the light source 3 and the optical plate 2 . The backlight module 1 includes an optical board 2 , a light source 3 , at least one optical film 5 and a frame 6 . Here, the light source 3 is a light emitting diode (Light Emitting Diode, LED) light bar and includes a plurality of LEDs 4 . Most of the light emitted by the LED 4 is guided by the optical board 2 and emitted uniformly on the light-emitting surface S1 of the optical board 2. However, a small amount of light, such as light L0, will be emitted from the side S2 of the optical board 2 and pass through the outer frame. 6 after reflection passes through the end surface S3 of the optical film 5 and exits from the surface S4 of the optical film 5, forming a bright line at the edge E of the optical film 5, thereby affecting the image quality of the liquid crystal display device.

The purpose of the present invention is to provide a backlight module and a display device to solve the above problems.

According to one embodiment of the present invention, a backlight module is provided, which includes a frame, an optical plate, a light source and an optical film. The frame includes a back board and a side wall, and the side wall ring is set on the back board. 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, and the optical film includes a body and at least one refraction part. The body includes a first surface, a second surface and at least one end surface, the second surface is opposite to the first surface, and the at least one end surface is connected between the first surface and the second surface. The at least one refraction portion is disposed on the at least one end surface, and the refraction portion includes a plurality of microstructures. The backplane carries the optical plate, and the side wall does not cover a top surface of the optical film. An 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.

Another embodiment of the present invention provides a backlight module, which includes a frame, an optical plate, a light source, and an optical film. The frame includes a back board and a side wall, and the side wall ring is set on the back board. 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, and the optical film includes a body and at least one refraction part. The body includes a first surface, a second surface and at least one end surface, the second surface is opposite to the first surface, and the at least one end surface is connected between the first surface and the second surface. The at least one refraction portion is disposed on the at least one end surface, and the refraction portion includes a plurality of microstructures. An 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 reflectance of the first area is smaller than that of the second area.

Another embodiment of the present invention provides a display device, including the above-mentioned backlight module and a display panel, and the display panel is arranged above the backlight module.

Compared with the prior art, the backlight module of the present invention is provided with at least one refraction part on at least one end surface of the optical film, so that multiple rays of light can be deflected in different directions after passing through the refraction part, so as to prevent light rays from concentrating on the same position and causing Bright lines can achieve the effect of softening the light, thereby improving the image quality of the display device, and are beneficial to be applied to the display device without a plastic frame or a narrow frame.

1,30,30': backlight module

2,100: Optical board

3,200: light source

4,210: LEDs

5,300,300': Optical film

6: Outer frame

10,10': display device

20: Display panel

S1,110: Light-emitting surface

120: bottom surface

S2,130: side

310: Ontology

311: first surface

312: second surface

313: first end face

314: second end face

315: the third end face

316: The fourth end face

320: Refraction Department

321: Microstructure

322: Substrate

320a: first extension

320b: second extension

400: frame

410: Backplane

420: side wall

421: The first area

422: second area

423: inner surface

424:top

A: part

D1: Lateral direction

E: at the edge

L0, L1, L2, L3, L4, L5, L6: Light

P1,P2,P3,P4,P5,P6,P7,P8,P9,P10: points

S3: end face

S4: surface

T: top surface

T1, T2, T3, T4: Thickness

M1, M2: Length

FIG. 1 is a schematic cross-sectional view of a conventional backlight module.

FIG. 2 is a schematic exploded side view of a display device according to an embodiment of the present invention.

Fig. 3 is an enlarged schematic view of part A in Fig. 2 .

Fig. 4 is an enlarged schematic view of part A in Fig. 2 according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of an optical film according to another embodiment of the present invention.

Fig. 6 is a three-dimensional exploded schematic diagram of the backlight module in Fig. 2 .

FIG. 7 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, back, bottom, top, etc., are only directions referring to the attached drawings. Accordingly, the directional terms used are illustrative rather than limiting of the invention. In addition, in the following embodiments, the same or similar elements will be given the same or similar symbols.

In the present invention, two elements are substantially parallel means that there is an included angle between the two elements, and the included angle is 0°±10°, preferably 0°±5°, more preferably 0°±3°, or, the included angle 180°±10°, preferably 180°±5°, more preferably 180°±3°.

In the present invention, the backlight module can be used to provide a light source for a liquid crystal display (Liquid Crystal Display, LCD) panel. Each element in the backlight module includes a bottom surface and a top surface, and the definition of the bottom surface and the top surface is based on the LCD panel. As a reference, the bottom surface of each component is the side away from the LCD panel, and the top surface is the side facing the LCD panel. In addition, in the present invention, an element disposed above another element means disposed on the top surface of the other element or above the top surface of the other element.

Please refer to FIG. 2 , which is a schematic exploded side view of the 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 for providing light to the display panel 20, and the display panel 20 can be an LCD panel.

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 .

The light source 200 can be arranged on the bottom surface 120 or the side surface 130 of the optical board 100, that is, the backlight module 30 can be a direct type backlight module or an edge type backlight module, and here the light source 200 is arranged on the side surface 130 of the optical board 100 1. The backlight module 30 is an edge-type backlight module as an example. The light source 200 can be, but not limited to, a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL) or an LED light bar. Here, an LED light bar is taken as an example, and the LED light bar includes a plurality of LEDs 210 .

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 refraction portion 320 . Please also refer to FIG. 6 , which is a three-dimensional exploded schematic diagram of the backlight module 30 in FIG. 2 . 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 connected between the first end surface 313 and the third end surface 315 , and the first end surface 313 faces the light source 200 . Here, the number of the refraction portion 320 is one and it is disposed on the second end surface 314 as an example.

Please refer to Fig. 3, which is an enlarged schematic diagram of part A in Fig. 2. For convenience of explanation, Fig. 3 is described in an XYZ rectangular coordinate system, wherein the X direction is perpendicular to the outside of the paper, and the body 310 in the optical film 300 The first surface 311 is parallel to the XY plane, and the second end surface 314 is parallel to the XZ plane. In this embodiment, the refraction portion 320 includes a plurality of microstructures 321, and the plurality of microstructures 321 are stacked on the basis of the second end surface 314 in a lateral direction D1 away from the second end surface 314. The lateral direction D1 and the Y direction Parallel, so that the refraction portion 320 has different thicknesses relative to the second end surface 314 in the lateral direction D1 (that is, the Y coordinates are different), such as thickness T1, T2, and the refractive index of the refraction portion 320 is different from that of the main body 310 so that a plurality of light rays, such as light rays L1 , L2 , and L3 , pass through the refraction portion 320 and then deflect in different directions. For example, the refraction portion 320 has structures with different thicknesses relative to the second end surface 314 in the lateral direction D1 , which can be formed by stacking microstructures 321 with the same or different sizes.

In Fig. 3, on the premise that the sizes of the microstructures 321 are substantially the same, the refraction portion 320 can have different thicknesses in the lateral direction D1 by stacking the microstructures 321, such as thickness T1, T2. In this way, the optical paths of the multiple light rays with different thicknesses in the refracting part 320 are different, which is beneficial for the multiple light rays to be emitted at different positions. Taking the light rays L1 and L2 as examples, the optical path of the light L1 in the refracting part 320 is: The straight-line distance from point P1 to point P2, the optical path of light L2 in the refraction part 320 is the straight-line distance from point P3 to point P4, the optical path of light L2 in the refraction part 320 is longer than the optical path of light L1 in the refraction part 320 . Furthermore, due to the difference in refractive index between the refracting portion 320 and the main body 310, compared with an optical film (not shown) without the refracting portion 320, when the light passes through the refracting portion 320 and the main body 310, the light will deflect one more time. The chance of refraction, taking the light L2 as an example, the light L2 enters the refraction part 320 from the point P3 in the air will undergo the first deflection, and when the light L2 enters the body 310 from the point P4 in the refraction part 320, it will undergo the second deflection , when the light L2 enters the air from the point P5 in the body 310, it will be deflected for the third time, and the optical film of the refraction part 320 is not provided. The second deflection occurs when 310 enters the air. Therefore, the present invention can increase the number of times of light deflection by using the refractive index difference between the refraction part 320 and the main body 310, and can further disperse the positions where multiple light rays are emitted, so as to prevent the light rays from concentrating on the same position and producing bright lines, and can The effect of softening the light is achieved, thereby improving the image quality of the display device 10 and facilitating the configuration of the display device 10 with a narrow frame.

Please refer to Figure 4, which is an enlarged schematic diagram of part A in Figure 2 according to another embodiment of the present invention. Compared with Figure 3, Figure 4 is also described in the XYZ rectangular coordinate system. Compared with Fig. 3, in this 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 example, spherical microstructures 321 of different sizes , the curvature of the spherical surface can make multiple light rays, such as light rays L4, L5, and L6, deflect in different directions after passing through the refracting part 320.

As shown in FIG. 4, based on the different sizes of the microstructures 321, the refraction portion 320 is stacked with different thicknesses in the lateral direction D1 away from the second end surface 314 based on the second end surface 314 (that is, the XZ plane), such as thickness T3, T4, thereby, the optical paths of the plurality of light rays in the refraction part 320 are different, for example, the light The optical path of L5 in the refraction portion 320 is longer than the optical path of light L4 in the refraction portion 320 , which is beneficial for multiple light rays to be emitted from different positions. Furthermore, in combination with the difference in refractive index between the refracting part 320 and the main body 310, when the light passes through the refracting part 320 and the main body 310, the number of times of light deflection can be increased. For details, please refer to the relevant description in FIG. 3 . In addition, the refractive indices of the microstructures 321 of different sizes can also be different, which can increase the random number of light deflection, so as to prevent the light from concentrating on the same position and producing bright lines, thereby achieving the effect of softening the light. In FIG. 4, the stacking manner of the microstructures 321 can also be adjusted to adjust the thickness of the refraction portion 320 along the lateral direction D1. In this embodiment, the refractive index of the main body 310 may be 1-3, and the refractive index of the refraction portion 320 may be 1-3. To sum up, the thickness of the refraction part 320 on the XZ plane is changed by changing the size of the microstructure 321 or different stacking methods of the same size, so as to increase the number of deflected light rays and prevent the light rays from concentrating on the same position and being emitted. Produce bright lines, and then achieve the effect of softening the light.

As shown in FIGS. 3 and 4 , the refraction portion 320 may further include a substrate 322 , and the microstructures 321 are dispersed on the substrate 322 . The base material 322 can be an adhesive for adhering the microstructure 321 to the second end surface 314. In this embodiment, although the base material 322 is used as the adhesive, in other embodiments, the base material 322 may not be used. , but the microstructure 321 is directly attached to the second end surface 314 , therefore, it is not limited to the embodiment in which the base material 322 is required. The refractive index of the substrate 322 will be further described below. The refractive index of the substrate 322 and the microstructure 321 can be the same or different. When the refractive index of the substrate 322 and the microstructure 321 are different, it is beneficial to increase the number of light deflection. , and can further enhance the effect of dispersing light. Taking the light L3 in Figure 3 as an example, the light L3 enters the microstructure 321 from the point P6 in the air and will go through the first deflection before entering the substrate from the point P7 in the microstructure 321. 322 will go through the second deflection, when the substrate 322 enters the microstructure 321 from point P8, it will go through the third deflection, when the microstructure 321 enters the body 310 from point P9, it will go through the fourth deflection, and on the body 310 The air entering from point P10 will go through the fifth deflection. Similarly, in FIG. 4 , since the light L6 passes through the substrate 322 , its deflection times are also greater than those of the light rays L4 and L5 .

The microstructure 321 has the property of light transmission, and the material of the microstructure 321 can be, for example, titanium dioxide (TiO ₂ ), silicon dioxide (SiO ₂ ), tantalum pentoxide (Ta ₂ O ₅ ), polymethyl methacrylate (polymethyl methacrylate). (methyl methacrylate), PMMA) or combinations thereof. The microstructures 321 can be microparticles, nanoparticles or a combination thereof, for example, the size of the microstructures 321 can be but not limited to 0.1 μm to 20 μm. The shape of the microstructure 321 is exemplified here as a sphere. Since the normal direction of each point on the sphere changes along the sphere, it is beneficial to change the direction of travel of multiple light rays. Taking the light rays L1 and L2 in FIG. 3 as an example, the light ray L1 , L2 travel in substantially parallel directions before entering the refracting portion 320, however, because the positions of the light rays L1 and L2 entering the microstructure 321 are different (that is, the position of the point P1 on the spherical surface is different from the position of the point P3 on the spherical surface), resulting in The incident angles of the light rays L1 and L2 entering the microstructure 321 are different, thereby affecting subsequent deflection angles. 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, and different parallel light rays can also be formed when they hit different planes. The angle of incidence is also beneficial to change the direction of travel of multiple light rays. The form of the microstructure 321 is a solid particle here, however, in other embodiments, the microstructure 321 can be configured in 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 TiO ₂ , SiO ₂ , Ta ₂ O ₅ , resin such as PMMA or its combination. The aforementioned composite particles (not shown) can be but not limited to a core-shell structure. The core-shell structure can include a core and a shell. The material of the core can be TiO ₂ , SiO ₂ or Ta ₂ O ₅ , and the material of the shell can be It is made of resin such as PMMA, or the materials of the core part and the shell part can be respectively different resins. In this way, the microstructure 321 itself can provide two different refractive indices, which can further enhance the effect of dispersing light

Please refer to FIG. 7 , which is a schematic cross-sectional view 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 shown here with a dotted line to present the light source 200 and the optical plate 100 relative position. The difference from the display device 10 in FIG. 2 is that the backlight module 30 ′ further includes a frame 400 , and the frame 400 includes a back plate 410 and side walls 420 , and the side walls 420 are arranged around the back plate 410 . Backplane 410 The optical plate 100 , the light source 200 and the optical film 300 are carried, the top 424 of the side wall 420 is used to carry the display panel 20 , and the top surface T of the optical film 300 is not shielded by the side wall 420 . In other words, the display device 10' is a display device without a plastic frame. The number of deflection times can be increased by the light reflected from the frame 400 passing through the refracting part 320, thereby preventing the light from concentrating on the same position and producing bright lines. bright lines, so that the display device 10' can be configured as a display device without a plastic frame.

In FIG. 7 , the inner surface 423 of the side wall 420 includes a first area 421 and a second area 422 , which are shown in different dot patterns to clearly distinguish them. The first region 421 corresponds to the optical film 300, and the second region 422 corresponds to the optical plate 100. The surface roughness of the first region 421 may be greater than the surface roughness of the second region 422 and/or the reflectivity of the first region 421 may be smaller than that of the second region 421. The reflectivity of the second area 422 . In other words, for the first region 421, the characteristic of smaller reflectivity can ensure that less light is reflected to the optical film 300, and the characteristic of greater roughness can ensure that the direction of the reflected light has higher randomness. , thereby ensuring that the inner surface 423 of the sidewall 420 can reflect the light back to the optical plate 100 for reuse, while preventing the light from concentrating on the optical film 300 , which can further enhance the effect of softening the light.

Please refer to FIG. 2 and FIG. 6 again. In this embodiment, the optical film 300 includes only one refraction 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 arranged 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 refraction parts, which are respectively arranged on the second end surface and the fourth end surface; or , the backlight module may only include one refraction portion, and be arranged on the first end face or the third end face; and, or the backlight module may also include three refraction portions, which are respectively arranged on the second end face, the third end face and the fourth end face . In other words, according to actual requirements, such as the arrangement of optical components in the backlight module and the required optical performance of the backlight module, the number and/or location of the refraction parts can be adjusted accordingly. Furthermore, in this embodiment, the backlight module 30 is exemplified by including an optical film 300. In other embodiments, the backlight module 30 may include multiple an optical film, and at least one of the plurality of optical films is provided with a refraction part.

2mm，第二延伸部320b於平行於側向方向D1的長度為M2，其可滿足下列條件式：0<M2

2mm，M2可與M1相同或相異。在另一實施方式中，第一延伸部320a或第二延伸部320b可依照需求擇一設置，以解決來自其他構件例如上方膠框或下方光學板的反射光線所造成的亮線問題。 Please refer to FIG. 5 , which is a schematic diagram of an optical film 300 ′ according to another embodiment of the present invention. The difference from the optical film 300 is that the refraction portion 320 of the optical film 300 ′ has a first extension 320 a and a second extension 320 b, and the first extension 320 a extends from the second end surface 314 to the second end of the body 310 . A surface 311 , the second extension portion 320 b extends from the second end surface 314 to the second surface 312 of the main body 310 . In this way, the light reflected from the frame (not shown in the figure) can pass through the first extension part 320a and/or the second extension part 320b after being deflected by the refraction part 320 located on the second end surface 314, which is beneficial to Increase the number of light deflection, which can further improve the effect of scattered 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 320b parallel to the lateral direction D1 is M2, which can satisfy the following conditional formula: 0<M2

2mm, M2 can be the same or different from M1. In another embodiment, the first extension part 320a or the second extension part 320b can be selected according to requirements to solve the bright line problem caused by reflected light from other components such as the upper plastic frame or the lower optical plate.

Compared with the prior art, the backlight module of the present invention is provided with at least one refraction part on at least one end surface of the optical film, so that multiple rays of light can be deflected in different directions after passing through the refraction part, so as to prevent light rays from concentrating on the same position and causing Bright lines can achieve the effect of softening the light, thereby improving the image quality of the display device, and are beneficial to be applied to the display device without a plastic frame or a narrow frame.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

30:Backlight module

100: optical board

110: light emitting surface

120: bottom surface

130: side

200: light source

210:LED

300: optical film

310: Ontology

311: first surface

312: second surface

313: first end face

314: second end face

315: the third end face

316: The fourth end face

320: Refraction Department

Claims (14)

A backlight module, comprising: a frame, including: a back panel; and a side wall, which is arranged around the back panel; an optical plate, including: a light-emitting surface; a bottom surface, opposite to the light-emitting surface; and a side surface , connected between the light-emitting surface and the bottom surface; a light source, arranged on the bottom surface or the side surface of the optical plate; and an optical film, arranged above the light-emitting surface, the optical film includes: a body, Including: 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; and at least one refraction portion, arranged on the end surface, the The refraction part includes a plurality of microstructures; wherein the back plate carries the optical plate, and the side wall does not cover a top surface of the optical film; wherein an inner surface of the side wall includes a first area and a second area , the first region corresponds to the optical film, the second region corresponds to the optical plate, and the surface roughness of the first region is greater than the surface roughness of the second region. A backlight module, comprising: a frame, including: a backboard; and a side wall, which is arranged around the backboard; An optical plate, comprising: a light-emitting surface; a bottom surface 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, arranged above the light-emitting surface, the optical film includes: a body, including: a first surface; a second surface, opposite to the first surface; and at least one end surface connected to the first surface between a surface and the second surface; and at least one refraction portion disposed on the end surface, the refraction portion comprising a plurality of microstructures; wherein an inner surface of the side wall comprises a first region and a second region, the The first area corresponds to the optical film, the second area corresponds to the optical plate, and the reflectance of the first area is smaller than that of the second area. The backlight module according to claim 1 or 2, wherein the refracting portion has different thicknesses from the end surface to a side direction away from the end surface. The backlight module as claimed in claim 1 or 2, wherein the refracting portion has a first extension extending from the end surface to the first surface of the main body. The backlight module as claimed in claim 4, wherein the refracting portion further has a second extension extending from the end surface to the second surface of the main body. The backlight module according to claim 1 or 2, wherein the refraction portion further includes a substrate, and the microstructures are dispersed on the substrate. The backlight module according to claim 1 or 2, wherein the microstructures are microparticles, nanoparticles or a combination thereof. The backlight module according to claim 1 or 2, wherein the microstructures are hollow particles, composite particles or a combination thereof. The backlight module according to claim 1 or 2, wherein the microstructures are made of titanium dioxide, silicon dioxide, tantalum pentoxide, polymethyl methacrylate or a combination thereof. The backlight module as described in claim 1 or 2, wherein the light source is arranged on the side of the optical plate, and the number of the end faces is four, namely a first end face, a second end face, a third end face and a A 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 connected between the first end surface and the third end surface, and the first end surface faces the light source. The backlight module as claimed in claim 10, wherein the number of the refraction parts is two, which are respectively disposed on the second end surface and the fourth end surface. The backlight module as claimed in claim 10, wherein the refracting portion is disposed on the first end surface or the third end surface. The backlight module as claimed in claim 10, wherein the number of the refracting portions is three, and are respectively disposed on the second end surface, the third end surface and the fourth end surface. A display device, comprising: a backlight module according to any one of claims 1 to 13; and a display panel disposed above the backlight module.

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