Backlight module capable of weakening one-way inclined light beams in front of backlight source lamp

Abstract

According to one technical scheme, the backlight module comprises a light guide plate, a backlight source, a reflection sheet, a diffusion sheet, a lower prismatic lens and an upper prismatic lens, the light guide plate comprises a light guide plate body part, and the front end of the light guide plate body part is integrally connected with a wedge-shaped structure part; a plurality of vertical first micro-structure grooves are formed in the light incident face of the wedge-shaped structure part at equal intervals, the projection of the first micro-structure grooves on the horizontal plane is in a right triangle shape, the first right-angle side of the right triangle is perpendicular to the light incident face, and the second right-angle side of the right triangle and the light incident face are located on the same plane. The second right-angle side and the bevel side are positioned on the right side of the first right-angle side; a plurality of long-strip-shaped inclined upper prisms are evenly distributed on the upper side face of the upper prismatic lens, the rear ends of the upper prisms incline rightwards, and the front ends of the upper prisms incline leftwards. The light incident surface of the light guide plate not only has a good light scattering effect, but also can weaken the unidirectional oblique light beam in front of the backlight source observed by human eyes.

Description

Technical Field

[0001] This invention relates to the field of backlight module technology, and in particular to a backlight module that can weaken the unidirectional oblique beam in front of the backlight source. Background Technology

[0002] Currently, backlight modules have been widely used in consumer electronics products such as smartphones, smartwatches, tablets, and laptops. As people's requirements for high brightness and thinness of LCD screens increase, high brightness ultra-thin backlight modules are gradually emerging.

[0003] like Figure 1 As shown, a high-brightness ultra-thin backlight module in the prior art includes a light guide plate 1, a backlight source 2, a reflective sheet 3, a diffuser sheet 4, a lower prism sheet 5, and an upper prism sheet 6. One end of the light guide plate 1 has a light-incident surface 13 facing the backlight source 2. The lower side of the light guide plate 1 is a dotted surface 14, and the upper side of the light guide plate 1 is a light-emitting surface. The backlight source 2 is usually an LED. The light guide plate 1 has a main body 11. A wedge-shaped structure 12 is integrally connected to the end of the main body 11 near the backlight source 2. The upper side of the wedge-shaped structure 12 is an inclined surface, and the end of the wedge-shaped structure 12 near the backlight source 2 is higher than the end away from the backlight source 2. The reflective sheet 3 is installed on the lower side of the light guide plate 1, the diffuser sheet 4 is installed on the upper side of the main body 11, the lower prism sheet 5 is installed on the upper side of the diffuser sheet 4, and the upper prism sheet 6 is installed on the upper side of the lower prism sheet 5. The light guide plate 1 is provided with a wedge-shaped structure 12, which on the one hand can make the height of the light-incident surface 13 of the light guide plate 1 match the height of the backlight 2, and on the other hand can make the main body 11 of the light guide plate thinner, thereby making the overall thickness of the backlight module thinner.

[0004] like Figure 2 As shown, when the backlight 2 of the backlight module emits light, the light emitted by the backlight 2 enters the wedge-shaped structure 12 and the main body 11 of the light guide plate 1 through the light-incident surface 13 of the light guide plate 1. Under the reflection of the dot surface 14 and the reflector 3 of the light guide plate 1, the light is emitted upward from the light-exit surface of the light guide plate 1, and then passes upward through the diffuser 4, the lower prism sheet 5, and the upper prism sheet 6 before exiting. The diffuser 4 diffuses the light. Multiple long, obliquely oriented lower prisms 51 are evenly arranged on the upper side of the lower prism sheet 5, and multiple long, obliquely oriented upper prisms 61 are evenly arranged on the upper side of the upper prism sheet 6. The oblique angles of the lower prisms 51 and the upper prisms 61 are different for different backlight 2s. Figure 1 In the middle, the upper prism 61 of the upper prism sheet 6 has an oblique angle of 45 degrees, and the lower prism 51 of the lower prism sheet 5 has an oblique angle of 135 degrees. Under the combined action of the lower prism 51 and the upper prism 61, the diffused light can be reconcentrated, the light loss rate can be reduced, and the brightness of the backlight module can be greatly increased.

[0005] However, the high-brightness ultra-thin backlight modules in the aforementioned prior art still have the following technical problems: such as Figure 2 As shown, when the light emitted from the backlight 2 passes through the wedge-shaped structure 12 of the light guide plate 1, a portion of the light passes through the inclined surface of the wedge-shaped structure 12 and shines onto the upper prism sheet 6. Since multiple upper prisms 61 with a set inclined angle are arranged on the upper prism sheet 6, and there are "V"-shaped grooves with a set inclined angle between adjacent upper prisms 61, a portion of the light that passes through the wedge-shaped structure 12 and shines onto the upper prism sheet 6 will be emitted along the direction of the "V"-shaped groove of the upper prism 61, forming a unidirectional oblique beam S in front of the backlight lamp, such as... Figure 2 As shown, when the human eye observes the unidirectional oblique beam S in front of the backlight at a specific angle, the unidirectional oblique beam S in front of the backlight will appear very obvious and dazzling.

[0006] In existing technologies, light guide plates have the following three conventional light incident surface structures: The first type of light guide plate light incident surface structure is described in [reference needed]. Figure 3 The light-incident surface of the light guide plate is the light-receiving surface. When the light from the backlight enters the light guide plate through this surface, the angle between the rightmost or leftmost light ray and the light-incident surface reaches 54.46 degrees, resulting in poor light scattering. Furthermore, the light intensity on both sides of the light guide plate is symmetrical, failing to address the problem of a very obvious and glaring unidirectional oblique beam S in front of the backlight. For the second type of light guide plate light-incident surface structure, see [link to relevant documentation]. Figure 4 The light guide plate has a microstructure with a large spacing, namely "V"-shaped sawtooth 135, on its light-incident surface. When the light from the backlight enters the light guide plate through its light-incident surface, the angle between the rightmost or leftmost light ray and the light-incident surface is 40.39 degrees, resulting in poor light scattering. Furthermore, the symmetrical light intensity on both sides of the light guide plate cannot solve the problem of a very obvious and glaring unidirectional oblique beam S in front of the backlight. (See the third type of light guide plate light-incident surface structure for details.) Figure 5 and Figure 6 The light guide plate has a densely spaced microstructure, namely "V"-shaped sawtooth 135. When the light from the backlight enters the light guide plate through the light guide plate, the angle between the light from the rightmost or leftmost side and the light guide plate is 35 degrees, which has a good light diffusion effect. However, the light intensity on both sides of the light guide plate is symmetrical, which still cannot solve the problem that the unidirectional oblique beam S in front of the backlight is very obvious and dazzling. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a backlight module that can weaken the unidirectional oblique beam in front of the backlight lamp, based on the shortcomings of the above-mentioned technology. The light guide plate of the backlight module not only has a good light diffusion effect, but also reduces the light emitted along the "V"-shaped groove of the upper prism, thereby weakening the unidirectional oblique beam in front of the backlight lamp as observed by the human eye, so as to achieve the effect that the unidirectional oblique beam in front of the backlight lamp is not obvious and not dazzling when viewed.

[0008] The first technical solution of the present application is: a backlight module capable of weakening the single-direction oblique light beam in front of the backlight lamp, comprising a light guide plate, a backlight source, a reflecting sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, a wedge-shaped structure part is integrally connected to the front end of the light guide plate main body part, the front side of the wedge-shaped structure part is a light entrance surface, the backlight source is arranged in front of the wedge-shaped structure part, the reflecting sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, the upper prism sheet is installed on the upper side of the lower prism sheet, a plurality of vertical first microstructure grooves are arranged at equal intervals on the light entrance surface of the wedge-shaped structure part, the projection of the first microstructure groove on the horizontal plane is a right triangle, the first right angle side of the right triangle is perpendicular to the light entrance surface, the second right angle side is on the same plane as the light entrance surface, the second right angle side and the oblique side are located on the right side of the first right angle side, the length of the first right angle side is 0.01-0.15mm, the included angle between the first right angle side and the oblique side is 30-70 degrees, and the included angle between the second right angle side and the oblique side is 30-70 degrees; a plurality of oblique upper prisms in the form of long strips are uniformly arranged on the upper side of the upper prism sheet, the rear end of the upper prism is inclined to the right, and the front end of the upper prism is inclined to the left.

[0009] The technical effect of the first technical solution of the present application is: because the first microstructure groove with a certain shape is arranged on the light entrance surface of the wedge-shaped structure part of the light guide plate, on the one hand, after the light of the backlight source is emitted to the light guide plate, the light can be well dispersed under the refraction and reflection of the light entrance surface of the light guide plate and the first microstructure groove, so that the light dispersion effect of the light entrance surface of the light guide plate of the backlight module is good; on the other hand, the first right angle side of the part of the first microstructure groove on the right side of the light guide plate can reflect part of the light to the left rear of the light guide plate, so that the light emitted by the backlight source to the right side of the light guide plate is weakened, and the length direction of the upper prism of the upper prism sheet is oblique, specifically, the rear end of the upper prism is inclined to the right, and the front end of the upper prism is inclined to the left, so that the light emitted along the "V"-shaped groove direction of the upper prism can be reduced, so that the single-direction oblique light beam in front of the backlight lamp observed by the human eye is weakened, and the effect that the single-direction oblique light beam in front of the backlight lamp is not obvious and not dazzling is achieved.

[0010] Preferably, the length of the first right angle side is 0.03-0.08mm, the included angle between the first right angle side and the oblique side is 40-60 degrees, and the included angle between the second right angle side and the oblique side is 40-60 degrees. A plurality of oblique lower prisms in the form of long strips are uniformly arranged on the upper side of the lower prism sheet, the rear end of the lower prism is inclined to the left, and the front end of the lower prism is inclined to the right; the backlight source is an LED, the lower side of the light guide plate is a dot surface, the upper side of the light guide plate is a light exit surface, a plurality of "V"-shaped grooves are arranged at equal intervals on the light exit surface, and the length direction of the "V"-shaped groove is perpendicular to the light entrance surface of the light guide plate.

[0011] The second technical solution of the present application is a backlight module capable of weakening the single-direction oblique light beam in front of the backlight lamp, comprising a light guide plate, a backlight source, a reflecting sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, a wedge-shaped structure part is integrally connected to the front end of the light guide plate main body part, the front side of the wedge-shaped structure part is a light inlet surface, the backlight source is arranged in front of the wedge-shaped structure part, the reflecting sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, the upper prism sheet is installed on the upper side of the lower prism sheet, a plurality of vertical second microstructure grooves are arranged on the light inlet surface of the wedge-shaped structure part at equal intervals, the projection of the second microstructure groove on the horizontal plane is a right triangle, the first right angle side of the right triangle is perpendicular to the light inlet surface, the second right angle side is on the same plane as the light inlet surface, the second right angle side and the oblique side are located on the left side of the first right angle side, the length of the first right angle side is 0.01-0.15mm, the included angle between the first right angle side and the oblique side is 30-70 degrees, the included angle between the second right angle side and the oblique side is 30-70 degrees, the upper side of the upper prism sheet is uniformly arranged with a plurality of long strip-shaped oblique upper prisms, the rear end of the upper prism is inclined to the left, and the front end of the upper prism is inclined to the right.

[0012] The technical effect of the second technical solution of the present application is that, due to the second microstructure groove with a certain shape being arranged on the light inlet surface of the wedge-shaped structure part of the light guide plate, on the one hand, the light of the backlight source can be well dispersed under the refraction and reflection of the light inlet surface of the light guide plate and the second microstructure groove after being emitted to the light guide plate, so that the light dispersion effect of the light inlet surface of the light guide plate of the backlight module is good, and on the other hand, the first right angle side of the part of the second microstructure groove on the left side of the light guide plate can reflect part of the light to the right rear of the light guide plate, so that the light emitted by the backlight source to the left side of the light guide plate is weakened, and the length direction of the upper prism of the upper prism sheet is oblique, specifically, the rear end of the upper prism is inclined to the left, and the front end of the upper prism is inclined to the right, so that the light emitted along the "V"-shaped groove direction of the upper prism can be reduced, so that the single-direction oblique light beam in front of the backlight lamp observed by the human eye is weakened, and the effect of not obvious and not dazzling of the single-direction oblique light beam in front of the backlight lamp is achieved.

[0013] Preferably, the length of the first right angle side is 0.03-0.08mm, the included angle between the first right angle side and the oblique side is 40-60 degrees, and the included angle between the second right angle side and the oblique side is 40-60 degrees. The upper side of the lower prism sheet is uniformly arranged with a plurality of long strip-shaped oblique lower prisms, the rear end of the lower prism is inclined to the right, and the front end of the lower prism is inclined to the left; the backlight source is an LED, the lower side of the light guide plate is a dot surface, the upper side of the light guide plate is a light outlet surface, a plurality of "V"-shaped grooves are arranged on the light outlet surface at equal intervals, and the length direction of the "V"-shaped groove is perpendicular to the light inlet surface of the light guide plate.

[0014] The third technical scheme of the present application is a backlight module capable of weakening the single-direction oblique light beam in front of the backlight lamp, comprising a light guide plate, a backlight source, a reflecting sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, a wedge-shaped structure part is integrally connected to the front end of the light guide plate main body part, the front side of the wedge-shaped structure part is a light inlet surface, the backlight source is arranged in front of the wedge-shaped structure part, the reflecting sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, the upper prism sheet is installed on the upper side of the lower prism sheet, a plurality of vertical third microstructure grooves are arranged on the light inlet surface of the wedge-shaped structure part at equal intervals, the projection of the third microstructure groove on the horizontal plane is a sector, the central angle of the sector is a right angle, the first radius of the sector is perpendicular to the light inlet surface, the second radius of the sector is on the same plane as the light inlet surface, the second radius and the arc side are located on the right side of the first radius, and the radius of the arc side is 0.03-0.1 mm; a plurality of long strip-shaped oblique upper prisms are uniformly arranged on the upper side of the upper prism sheet, the rear end of the upper prism is inclined to the right, and the front end of the upper prism is inclined to the left.

[0015] The technical effect of the third technical scheme of the present application is that, due to the third microstructure groove with a specified shape being arranged on the light inlet surface of the wedge-shaped structure part of the light guide plate, on the one hand, the light rays of the backlight source can be well dispersed under the refraction and reflection of the light inlet surface of the light guide plate and the third microstructure groove after being emitted to the light guide plate, so that the light dispersion effect of the light inlet surface of the light guide plate of the backlight module is good; on the other hand, the first radius of the part of the third microstructure grooves on the right side of the light guide plate can reflect part of the light rays to the left rear of the light guide plate, so that the light rays emitted by the backlight source to the right side of the light guide plate are weakened, and the length direction of the upper prisms of the upper prism sheet is oblique, specifically, the rear end of the upper prism is inclined to the right, and the front end of the upper prism is inclined to the left, so that the light rays emitted along the "V"-shaped groove direction of the upper prism can be reduced, so that the single-direction oblique light beam in front of the backlight lamp observed by the human eye is weakened, and the effect that the single-direction oblique light beam in front of the backlight lamp is not obvious and not dazzling is achieved.

[0016] Preferably, the radius of the arc side is 0.05-0.08 mm; a plurality of long strip-shaped oblique lower prisms are uniformly arranged on the upper side of the lower prism sheet, the rear end of the lower prism is inclined to the left, and the front end of the lower prism is inclined to the right. The backlight source is an LED, the lower side of the light guide plate is a dot surface, the upper side of the light guide plate is an light outlet surface, a plurality of "V"-shaped grooves are arranged on the light outlet surface at equal intervals, and the length direction of the "V"-shaped groove is perpendicular to the light inlet surface of the light guide plate.

[0017] The fourth technical solution of the present application is a backlight module capable of weakening the single-direction inclined light beam in front of the backlight source lamp, comprising a light guide plate, a backlight source, a reflecting sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, a wedge-shaped structure part is integrally connected to the front end of the light guide plate main body part, the front side of the wedge-shaped structure part is a light inlet surface, the backlight source is arranged in front of the wedge-shaped structure part, the reflecting sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, the upper prism sheet is installed on the upper side of the lower prism sheet, a plurality of vertical fourth microstructure grooves are arranged on the light inlet surface of the wedge-shaped structure part at equal intervals, the projection of the fourth microstructure groove on the horizontal plane is a sector, the central angle of the sector is a right angle, the first radius side of the sector is perpendicular to the light inlet surface, the second radius side is on the same plane as the light inlet surface, the second radius side and the arc side are located on the left side of the first radius side, and the radius of the arc side is 0.03-0.1 mm; a plurality of long strip-shaped inclined upper prisms are uniformly arranged on the upper side of the upper prism sheet, the rear end of the upper prism is inclined to the left, and the front end of the upper prism is inclined to the right.

[0018] The technical effect of the fourth technical solution of the present application is that: because the fourth microstructure groove with a certain shape is arranged on the light inlet surface of the wedge-shaped structure part of the light guide plate, on the one hand, after the light of the backlight source is emitted to the light guide plate, the light can be well dispersed under the refraction and reflection of the light inlet surface of the light guide plate and the fourth microstructure groove, so that the light dispersion effect of the light inlet surface of the light guide plate of the backlight module is good; on the other hand, the first radius side of the part of the fourth microstructure groove on the left side of the light guide plate can reflect part of the light to the right rear of the light guide plate, so that the light emitted by the backlight source to the left side of the light guide plate is weakened, and the length direction of the upper prism of the upper prism sheet is inclined, specifically, the rear end of the upper prism is inclined to the left, and the front end of the upper prism is inclined to the right, so that the light emitted along the "V"-shaped groove direction of the upper prism can be reduced, so that the single-direction inclined light beam in front of the backlight source lamp observed by the human eye is weakened, and the effect of not obvious and not dazzling is achieved.

[0019] Preferably, the radius of the arc side is 0.05-0.08 mm; a plurality of long strip-shaped inclined lower prisms are uniformly arranged on the upper side of the lower prism sheet, the rear end of the lower prism is inclined to the right, and the front end of the lower prism is inclined to the left. The backlight source is an LED, the lower side of the light guide plate is a dot surface, the upper side of the light guide plate is an light outlet surface, a plurality of "V"-shaped grooves are arranged on the light outlet surface at equal intervals, and the length direction of the "V"-shaped groove is perpendicular to the light inlet surface of the light guide plate. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a dispersion structure diagram of the backlight module in the prior art.

[0021] Figure 2For the present invention and prior art, the longitudinal section view and light path diagram along the upper prism direction of the backlight module.

[0022] Figure 3 For the light path diagram of the light entering the light guide plate of the first backlight source in the prior art.

[0023] Figure 4 For the light path diagram of the light entering the light guide plate of the second backlight source in the prior art.

[0024] Figure 5 For the light path diagram of the light entering the light guide plate of the third backlight source in the prior art.

[0025] Figure 6 For Figure 5 The local enlarged view of part A.

[0026] Figure 7 For the dispersion structure diagram of the backlight module in embodiment one of the present invention.

[0027] Figure 8 For the top view structure diagram of the backlight module in embodiment one of the present invention.

[0028] Figure 9 For Figure 8 The local enlarged view of part B.

[0029] Figure 10 For the light path diagram of the light entering the light guide plate of the backlight source in embodiment one of the present invention.

[0030] Figure 11 For Figure 10 The local enlarged view of part C.

[0031] Figure 12 For the dispersion structure diagram of the backlight module in embodiment two of the present invention.

[0032] Figure 13 For the top view structure diagram of the backlight module in embodiment two of the present invention.

[0033] Figure 14 For Figure 13 The local enlarged view of part D.

[0034] Figure 15 For the light path diagram of the light entering the light guide plate of the backlight source in embodiment two of the present invention.

[0035] Figure 16 For Figure 15 The local enlarged view of part E.

[0036] Figure 17 For the dispersion structure diagram of the backlight module in embodiment three of the present invention.

[0037] Figure 18 This is a top view of the backlight module in Embodiment 3 of the present invention.

[0038] Figure 19 for Figure 18 A magnified view of part F in the middle.

[0039] Figure 20 This is a schematic diagram of the light path of the backlight entering the light guide plate in Embodiment 3 of the present invention.

[0040] Figure 21 for Figure 20 A magnified view of part G in the middle.

[0041] Figure 22 This is a schematic diagram of the dispersed structure of the backlight module in Embodiment 4 of the present invention.

[0042] Figure 23 This is a top view of the backlight module in Embodiment 4 of the present invention.

[0043] Figure 24 for Figure 23 A magnified view of part H in the middle.

[0044] Figure 25 This is a schematic diagram of the light path of the backlight entering the light guide plate in Embodiment 4 of the present invention.

[0045] Figure 26 for Figure 25 A magnified view of part I in the middle. Detailed Implementation

[0046] The structural and working principles of the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," etc., indicate the orientation or positional relationship shown in the accompanying drawings, see [link to drawings]. Figure 10 , Figure 15 , Figure 20 and Figure 25 In this context, "front" refers to the side closer to the backlight, "back" refers to the side farther from the backlight, "left" refers to the left side of the light guide plate, and "right" refers to the right side of the light guide plate. Example 1

[0048] like Figure 7 , Figure 8 and Figure 9As shown, the embodiment one is a backlight module capable of weakening the unidirectional oblique light beam in front of the backlight lamp, comprising a light guide plate 1, a backlight source 2, a reflective sheet 3, a diffusion sheet 4, a lower prism sheet 5 and an upper prism sheet 6, the light guide plate 1 comprises a light guide plate main body part 11, the front end of the light guide plate main body part 11 is integrally connected with a wedge-shaped structure part 12, the front side of the wedge-shaped structure part 12 is a light inlet face 13, the backlight source 2 is arranged in front of the wedge-shaped structure part 12, the upper side of the wedge-shaped structure part 12 is an inclined plane, and the end of the wedge-shaped structure part 12 close to the backlight source 2 is higher than the end far away from the backlight source 12, the reflective sheet 3 is installed on the lower side of the light guide plate 1, the diffusion sheet 4 is installed on the upper side of the light guide plate main body part 11, the lower prism sheet 5 is installed on the upper side of the diffusion sheet 4, the upper prism sheet 6 is installed on the upper side of the lower prism sheet 5, the light inlet face 13 of the wedge-shaped structure part 12 is provided with a plurality of vertical first microstructure grooves 131 at equal intervals, the projection of the first microstructure groove 131 on the horizontal plane is a right triangle, the first right angle side of the right triangle is perpendicular to the light inlet face 13, the second right angle side is on the same plane as the light inlet face 13, the second right angle side and the oblique side are on the right side of the first right angle side, the length d of the first right angle side is 0.01-0.15mm, the included angle a between the first right angle side and the oblique side is 30-70 degrees, the included angle b between the second right angle side and the oblique side is 30-70 degrees; the upper side of the upper prism sheet 6 is uniformly arranged with a plurality of long strip-shaped oblique upper prisms 61, the rear end of the upper prism 61 is inclined to the right, the front end of the upper prism 61 is inclined to the left, and the adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle.

[0049] In combination Figure 2 As shown, when the light emitted by the backlight source 2 passes through the wedge-shaped structure part 12 of the light guide plate 1, a part of the light will transmit through the inclined plane of the wedge-shaped structure part 12 and be emitted to the upper prism sheet 6, because a plurality of upper prisms 61 with a set oblique angle are arranged on the upper prism sheet 6, and the adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle, therefore, the light transmitted through the wedge-shaped structure part 12 and emitted to the upper prism sheet 61 will have a part of the light emitted along the direction of the "V"-shaped groove of the upper prism 61, forming a unidirectional oblique light beam S in front of the backlight lamp, as shown in Figure 2 As shown, when the human eye E observes along the direction of the "V"-shaped groove of the upper prism 61, the unidirectional oblique light beam S in front of the backlight lamp can be observed.

[0050] As shown in Figure 10 and Figure 11As shown, in the present embodiment, when the light of the backlight 2 enters the light guide plate 1 through the light-incident surface 13 of the light guide plate 1, the light can be dispersed well under the refraction and reflection of the light-incident surface 13 and the first microstructure groove 131. The angle between the light ray at the leftmost side and the light-incident surface is 21.08 degrees, and the angle between the light ray at the rightmost side and the light-incident surface is 35.31 degrees. The overall light dispersion effect is obviously better than that of the prior art. Furthermore, the first straight edge of the first microstructure groove 131 at the right side of the light guide plate 1 can reflect part of the light to the left rear of the light guide plate 1, and the reflected light is S1. Thus, the light from the backlight 2 to the right side of the light guide plate 1 is weakened. The length direction of the upper prism 61 of the upper prism sheet 6 is oblique, specifically, the rear end of the upper prism 61 is obliquely inclined to the right, and the front end of the upper prism 61 is obliquely inclined to the left. Therefore, the light emitted along the "V"-shaped groove of the upper prism 61 can be reduced, so that the one-way oblique light beam S in front of the backlight lamp observed by the human eye is weakened, and the effect of not obvious and not dazzling of the one-way oblique light beam S in front of the backlight lamp is achieved.

[0051] As shown in Figure 9 , as a preferred mode of the present application, the length d of the first straight edge is 0.03-0.08 mm, the angle a between the first straight edge and the oblique edge is 40-60 degrees, and the angle b between the second straight edge and the oblique edge is 40-60 degrees. As shown in Figure 7 , the upper side of the lower prism sheet 5 is uniformly arranged with a plurality of long and oblique lower prisms 51. The rear end of the lower prism 51 is obliquely inclined to the left, and the front end of the lower prism 51 is obliquely inclined to the right. The angle between the upper prism 61 and the light-incident surface of the light guide plate is preferably 45 degrees, and the angle between the lower prism 51 and the light-incident surface of the light guide plate is preferably 135 degrees. The backlight 2 is an LED, the lower side of the light guide plate 1 is a dot surface 14, the upper side of the light guide plate 1 is a light-incident surface, and the light-incident surface is provided with a plurality of "V"-shaped grooves 15 at equal intervals. The length direction of the "V"-shaped groove 15 is perpendicular to the light-incident surface 13 of the light guide plate 1. Example Two

[0052] As shown in Figure 12 , Figure 13 and Figure 14As shown, the second embodiment is a backlight module capable of weakening the unidirectional oblique light beam in front of the backlight lamp, which comprises a light guide plate 1, a backlight 2, a reflective sheet 3, a diffusion sheet 4, a lower prism sheet 5 and an upper prism sheet 6. The light guide plate 1 comprises a light guide plate main body 11, and a wedge-shaped structure 12 is integrally connected to the front end of the light guide plate main body 11. The front side of the wedge-shaped structure 12 is a light inlet surface 13. The backlight 2 is arranged in front of the wedge-shaped structure 12. The upper side of the wedge-shaped structure 12 is an inclined surface. The end of the wedge-shaped structure 12 close to the backlight 2 is higher than the end away from the backlight 12. The reflective sheet 3 is installed on the lower side of the light guide plate 1. The diffusion sheet 4 is installed on the upper side of the light guide plate main body 11. The lower prism sheet 5 is installed on the upper side of the diffusion sheet 4. The upper prism sheet 6 is installed on the upper side of the lower prism sheet 5. The light inlet surface 13 of the wedge-shaped structure 12 is provided with a plurality of vertical second microstructure grooves 132 at equal intervals. The projection of the second microstructure groove 132 on the horizontal plane is a right triangle. The first right angle side of the right triangle is perpendicular to the light inlet surface 13. The second right angle side is on the same plane as the light inlet surface 13. The second right angle side and the hypotenuse are on the left side of the first right angle side. The length d of the first right angle side is 0.01-0.15 mm. The included angle a between the first right angle side and the hypotenuse is 30-70 degrees. The included angle b between the second right angle side and the hypotenuse is 30-70 degrees. The upper side of the upper prism sheet 6 is uniformly arranged with a plurality of long strip-shaped oblique upper prisms 61. The rear end of the upper prism 61 is inclined to the left. The front end of the upper prism 61 is inclined to the right. Adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle.

[0053] In combination Figure 2 As shown, when the light emitted by the backlight 2 passes through the wedge-shaped structure 12 of the light guide plate 1, a part of the light will transmit through the inclined surface of the wedge-shaped structure 12 and be incident on the upper prism sheet 6. Since the upper prism sheet 6 is arranged with a plurality of upper prisms 61 with a set oblique angle, and adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle, therefore, the light incident on the upper prism sheet 61 through the wedge-shaped structure 12 will have a part of the light emitted along the direction of the "V"-shaped groove of the upper prism 61, forming a unidirectional oblique light beam S in front of the backlight lamp, as shown in Figure 2 As shown, when the human eye E observes along the direction of the "V"-shaped groove of the upper prism 61, the unidirectional oblique light beam S in front of the backlight lamp can be observed.

[0054] As shown in Figure 15 and Figure 16As shown, in the present embodiment, when the light of the backlight 2 enters the light guide plate 1 through the light-incident surface 13 of the light guide plate 1, the light can be dispersed well under the refraction and reflection of the light-incident surface 13 and the second micro-structure groove 132. The angle between the light ray at the rightmost side and the light-incident surface is 21.08 degrees, and the angle between the light ray at the leftmost side and the light-incident surface is 35.31 degrees. The overall light dispersion effect is obviously better than that of the prior art. Furthermore, the first straight edge of the second micro-structure groove 132 at the left side of the light guide plate 1 can reflect part of the light to the right rear of the light guide plate 1, and the reflected light is S1. Thus, the light of the backlight 2 directed to the left side of the light guide plate 1 is weakened. The length direction of the upper prism 61 of the upper prism sheet 6 is oblique, specifically, the rear end of the upper prism 61 is inclined to the left, and the front end of the upper prism 61 is inclined to the right. Therefore, the light emitted along the "V"-shaped groove of the upper prism 61 can be reduced, so that the one-way oblique light beam S in front of the backlight is weakened, and the effect that the one-way oblique light beam S in front of the backlight is not obvious and not dazzling is achieved.

[0055] As shown in Figure 14 , as a preferred mode of the present application, the length d of the first straight edge is 0.03-0.08 mm, the angle a between the first straight edge and the oblique edge is 40-60 degrees, and the angle b between the second straight edge and the oblique edge is 40-60 degrees. As shown in Figure 12 , the upper side of the lower prism sheet 5 is uniformly arranged with a plurality of long and oblique lower prisms 51. The rear end of the lower prism 51 is inclined to the right, and the front end of the lower prism 51 is inclined to the left. The angle between the upper prism 61 and the light-incident surface of the light guide plate is preferably 135 degrees, and the angle between the lower prism 51 and the light-incident surface of the light guide plate is preferably 45 degrees. The backlight 2 is an LED, the lower side of the light guide plate 1 is a dot surface 14, the upper side of the light guide plate 1 is a light-incident surface, and the light-incident surface is provided with a plurality of "V"-shaped grooves 15 at equal intervals. The length direction of the "V"-shaped groove 15 is perpendicular to the light-incident surface 13 of the light guide plate 1. Example Three

[0056] As shown in Figure 17 , Figure 18 and Figure 19As shown, the third embodiment is a backlight module capable of weakening the unidirectional oblique light beam in front of the backlight lamp, which comprises a light guide plate 1, a backlight 2, a reflective sheet 3, a diffusion sheet 4, a lower prism sheet 5 and an upper prism sheet 6. The light guide plate 1 comprises a light guide plate main body 11, and a wedge-shaped structure 12 is integrally connected to the front end of the light guide plate main body 11. The front side of the wedge-shaped structure 12 is a light inlet surface 13. The backlight 2 is arranged in front of the wedge-shaped structure 12. The upper side of the wedge-shaped structure 12 is an inclined surface, and the end of the wedge-shaped structure 12 close to the backlight 2 is higher than the end away from the backlight 12. The reflective sheet 3 is installed on the lower side of the light guide plate 1. The diffusion sheet 4 is installed on the upper side of the light guide plate main body 11. The lower prism sheet 5 is installed on the upper side of the diffusion sheet 4. The upper prism sheet 6 is installed on the upper side of the lower prism sheet 5. A plurality of vertical third microstructure grooves 133 are arranged at equal intervals on the light inlet surface 13 of the wedge-shaped structure 12. The projection of the third microstructure groove 133 on the horizontal plane is a sector. The central angle of the sector is a right angle. The first radius of the sector is perpendicular to the light inlet surface 13. The second radius of the sector is on the same plane as the light inlet surface 13. The second radius and the arc side are on the right side of the first radius. The radius R of the arc side is 0.03-0.1 mm. A plurality of long strip-shaped oblique upper prisms 61 are uniformly arranged on the upper side of the upper prism sheet 6. The rear end of the upper prism 61 is inclined to the right. The front end of the upper prism 61 is inclined to the left. Adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle.

[0057] In combination Figure 2 As shown, when the light emitted by the backlight 2 passes through the wedge-shaped structure 12 of the light guide plate 1, a part of the light will transmit through the inclined surface of the wedge-shaped structure 12 and be emitted to the upper prism sheet 6. Since a plurality of upper prisms 61 with a set oblique angle are arranged on the upper prism sheet 6, and adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle, a part of the light emitted to the upper prism sheet 61 will be emitted along the direction of the "V"-shaped groove of the upper prism 61, forming a unidirectional oblique light beam S in front of the backlight lamp, as shown in Figure 2 As shown, when the human eye E observes along the direction of the "V"-shaped groove of the upper prism 61, the unidirectional oblique light beam S in front of the backlight lamp can be observed.

[0058] As shown in Figure 20 and Figure 21As shown, in the present embodiment, when the light of the backlight 2 enters the light guide plate 1 through the light-incident surface 13 of the light guide plate 1, the light can be dispersed well under the refraction and reflection of the light-incident surface 13 and the third microstructure groove 133. The angle between the light ray at the rightmost side and the light-incident surface is 30.11 degrees, and the angle between the light ray at the leftmost side and the light-incident surface is 21.23 degrees. The overall light dispersion effect is obviously better than that of the prior art. Moreover, the first radius side of the third microstructure groove 133 at the right side of the light guide plate 1 can reflect part of the light to the left rear of the light guide plate 1, and the reflected light is S1. Thus, the light from the backlight 2 to the right side of the light guide plate 1 is weakened. The length direction of the upper prism 61 of the upper prism sheet 6 is oblique, specifically, the rear end of the upper prism 61 is inclined to the right, and the front end of the upper prism 61 is inclined to the left. Therefore, the light emitted along the "V"-shaped groove of the upper prism 61 can be reduced, so that the one-way oblique light beam S in front of the backlight lamp observed by the human eye is weakened, and the effect of not obvious and not dazzling of the one-way oblique light beam S in front of the backlight lamp is achieved.

[0059] As shown in the drawings, Figure 19 As a preferred mode of the present application, the radius R of the arc-shaped side is 0.05-0.08 mm. Figure 17 As shown, the upper side of the lower prism sheet 5 is uniformly arranged with a plurality of long and oblique lower prisms 51. The rear end of the lower prism 51 is inclined to the left, and the front end of the lower prism 51 is inclined to the right. The angle between the upper prism 61 and the light-incident surface of the light guide plate is preferably 45 degrees, and the angle between the lower prism 51 and the light-incident surface of the light guide plate is preferably 135 degrees. The backlight 2 is an LED. The lower side of the light guide plate 1 is a dot surface 14, and the upper side of the light guide plate 1 is a light-incident surface. A plurality of "V"-shaped grooves 15 are arranged on the light-incident surface at equal intervals. The length direction of the "V"-shaped groove 15 is perpendicular to the light-incident surface 13 of the light guide plate 1. Example Four

[0060] As shown in the drawings, Figure 22 , Figure 23 and Figure 24As shown, embodiment four is a backlight module capable of weakening the unidirectional oblique light beam in front of the backlight lamp, comprising a light guide plate 1, a backlight 2, a reflective sheet 3, a diffusion sheet 4, a lower prism sheet 5 and an upper prism sheet 6, the light guide plate 1 comprises a light guide plate main body part 11, the front end of the light guide plate main body part 11 is integrally connected with a wedge-shaped structure part 12, the front side of the wedge-shaped structure part 12 is a light inlet face 13, the backlight 2 is arranged in front of the wedge-shaped structure part 12, the upper side of the wedge-shaped structure part 12 is an inclined plane, and the end of the wedge-shaped structure part 12 close to the backlight 2 is higher than the end far away from the backlight 12, the reflective sheet 3 is installed on the lower side of the light guide plate 1, the diffusion sheet 4 is installed on the upper side of the light guide plate main body part 11, the lower prism sheet 5 is installed on the upper side of the diffusion sheet 4, the upper prism sheet 6 is installed on the upper side of the lower prism sheet 5, the light inlet face 13 of the wedge-shaped structure part 12 is provided with a plurality of vertical fourth microstructure grooves 134 at equal intervals, the projection of the fourth microstructure groove 134 on the horizontal plane is a sector, the central angle of the sector is a right angle, the first radius side of the sector is perpendicular to the light inlet face 13, the second radius side is on the same plane as the light inlet face 13, the second radius side and the arc side are on the left side of the first radius side, and the radius R of the arc side is 0.03-0.1 mm; the upper side of the upper prism sheet 6 is uniformly arranged with a plurality of long strip-shaped oblique upper prisms 61, the rear end of the upper prism 61 is inclined to the left, the front end of the upper prism 61 is inclined to the right, and the adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle.

[0061] In combination Figure 2 As shown, when the light emitted by the backlight 2 passes through the wedge-shaped structure part 12 of the light guide plate 1, a part of the light will transmit through the inclined plane of the wedge-shaped structure part 12 and be emitted to the upper prism sheet 6, because a plurality of upper prisms 61 with a set oblique angle are arranged on the upper prism sheet 6, and the adjacent upper prisms 61 have a "V"-shaped groove with a set oblique angle, therefore, the light transmitted through the wedge-shaped structure part 12 and emitted to the upper prism sheet 61 will have a part of the light emitted along the direction of the "V"-shaped groove of the upper prism 61, forming a unidirectional oblique light beam S in front of the backlight lamp, as shown in Figure 2 As shown, when the human eye E observes along the direction of the "V"-shaped groove of the upper prism 61, the unidirectional oblique light beam S in front of the backlight lamp can be observed.

[0062] As shown in Figure 25 and Figure 26As shown, in this embodiment, when the light from the backlight 2 enters the light guide plate 1 through the light incident surface 13, it can be better diffused under the refraction and reflection of the light incident surface 13 and the fourth microstructure groove 134. The angle between the light from the leftmost side and the light incident surface is 30.11 degrees, and the angle between the light from the rightmost side and the light incident surface is 21.23 degrees. The overall diffused light effect is significantly better than the diffused light effect in the prior art. Furthermore, the first radial edge of the fourth microstructure groove 134 located on the left side of the light guide plate 1 can reflect some light to the right rear of the light guide plate 1. The reflected light is S1, thereby weakening the light emitted by the backlight 2 to the left side of the light guide plate 1. The upper prism 61 of the upper prism sheet 6 is oblique in length direction, specifically, the rear end of the upper prism 61 is tilted to the left and the front end of the upper prism 61 is tilted to the right. Therefore, the light emitted along the "V"-shaped groove of the upper prism 61 can be reduced, thereby weakening the unidirectional oblique beam in front of the backlight lamp observed by the human eye, achieving the effect that the unidirectional oblique beam in front of the backlight lamp is not obvious and not dazzling.

[0063] like Figure 24 As shown, in a preferred embodiment of the present invention, the radius R of the arc-shaped edge is 0.05–0.08 mm; as Figure 22 As shown, the upper side of the lower prism sheet 5 is evenly arranged with multiple long, oblique lower prisms 51. The rear end of the lower prism 51 is tilted to the right, and the front end of the lower prism 51 is tilted to the left. The angle between the upper prism 61 and the light-incident surface of the light guide plate is preferably 45 degrees, and the angle between the lower prism 51 and the light-incident surface of the light guide plate is preferably 135 degrees. The backlight 2 is an LED. The lower side of the light guide plate 1 is a dotted surface 14, and the upper side of the light guide plate 1 is a light-emitting surface. The light-emitting surface is provided with multiple "V"-shaped grooves 15 at equal intervals. The length direction of the "V"-shaped grooves 15 is perpendicular to the light-incident surface 13 of the light guide plate 1.

[0064] The above description is merely a preferred embodiment of the present invention. Any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical solution of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A backlight module capable of weakening the unidirectional oblique light beam in front of the backlight source lamp, comprising a light guide plate, a backlight source, a reflective sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, the front end of the light guide plate main body part is integrally connected with a wedge-shaped structure part, the front side of the wedge-shaped structure part is a light inlet surface, the backlight source is arranged in front of the wedge-shaped structure part, the reflective sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, and the upper prism sheet is installed on the upper side of the lower prism sheet, characterized in that: The light-incident surface of the wedge-shaped structure part is provided with a plurality of vertical first microstructure grooves at equal intervals, the projection of the first microstructure grooves on a horizontal plane is a right triangle, the first right angle side of the right triangle is perpendicular to the light-incident surface, the second right angle side is on the same plane as the light-incident surface, the second right angle side and the hypotenuse are located on the right side of the first right angle side, the length of the first right angle side is 0.01-0.15 mm, the included angle between the first right angle side and the hypotenuse is 30-70 degrees, and the included angle between the second right angle side and the hypotenuse is 30-70 degrees; the upper side of the upper prism sheet is uniformly provided with a plurality of oblique long strip-shaped upper prisms, the rear end of the upper prism is inclined to the right, and the front end of the upper prism is inclined to the left.

2. The backlight module capable of weakening the front unidirectional oblique light beam of the backlight source lamp according to claim 1, characterized in that: The length of the first right angle side is 0.03-0.08 mm, the included angle between the first right angle side and the hypotenuse is 40-60 degrees, and the included angle between the second right angle side and the hypotenuse is 40-60 degrees.

3. The backlight module capable of weakening the unidirectional oblique light beam in front of the backlight source lamp according to claim 1, characterized in that: The upper side of the lower prism sheet is uniformly provided with a plurality of oblique long strip-shaped lower prisms, the rear end of the lower prism is inclined to the left, and the front end of the lower prism is inclined to the right; the backlight source is an LED, the lower side of the light guide plate is a dot screen, the upper side of the light guide plate is a light-incident surface, the light-incident surface is provided with a plurality of "V"-shaped grooves at equal intervals, and the length direction of the "V"-shaped grooves is perpendicular to the light-incident surface of the light guide plate.

4. A backlight module capable of weakening the unidirectional oblique light beam in front of the backlight source lamp, comprising a light guide plate, a backlight source, a reflecting sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, the front end of the light guide plate main body part is integrally connected with a wedge-shaped structure part, the front side of the wedge-shaped structure part is a light inlet face, the backlight source is arranged in front of the wedge-shaped structure part, the reflecting sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, and the upper prism sheet is installed on the upper side of the lower prism sheet, characterized in that: The light-incident surface of the wedge-shaped structure part is provided with a plurality of vertical first microstructure grooves at equal intervals, the projection of the first microstructure grooves on a horizontal plane is a right triangle, the first right angle side of the right triangle is perpendicular to the light-incident surface, the second right angle side is on the same plane as the light-incident surface, the second right angle side and the hypotenuse are located on the right side of the first right angle side, the length of the first right angle side is 0.01-0.15 mm, the included angle between the first right angle side and the hypotenuse is 30-70 degrees, and the included angle between the second right angle side and the hypotenuse is 30-70 degrees; the upper side of the upper prism sheet is uniformly provided with a plurality of oblique long strip-shaped upper prisms, the rear end of the upper prism is inclined to the right, and the front end of the upper prism is inclined to the left.

5. The backlight module capable of weakening the front unidirectional oblique light beam of the backlight source lamp according to claim 4, characterized in that: The length of the first right angle side is 0.03-0.08 mm, the included angle between the first right angle side and the hypotenuse is 40-60 degrees, and the included angle between the second right angle side and the hypotenuse is 40-60 degrees; the upper side of the lower prism sheet is uniformly provided with a plurality of oblique long strip-shaped lower prisms, the rear end of the lower prism is inclined to the right, and the front end of the lower prism is inclined to the left; the backlight source is an LED, the lower side of the light guide plate is a dot screen, the upper side of the light guide plate is a light-incident surface, the light-incident surface is provided with a plurality of "V"-shaped grooves at equal intervals, and the length direction of the "V"-shaped grooves is perpendicular to the light-incident surface of the light guide plate.

6. A backlight module capable of weakening the unidirectional oblique light beam in front of the backlight source lamp, comprising a light guide plate, a backlight source, a reflecting sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, the front end of the light guide plate main body part is integrally connected with a wedge-shaped structure part, the front side of the wedge-shaped structure part is a light inlet face, the backlight source is arranged in front of the wedge-shaped structure part, the reflecting sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, and the upper prism sheet is installed on the upper side of the lower prism sheet, characterized in that: The light-incident surface of the wedge-shaped structure part is provided with a plurality of vertical third microstructure grooves at equal intervals, the projection of the third microstructure grooves on a horizontal plane is a sector, the central angle of the sector is a right angle, the first radius side of the sector is perpendicular to the light-incident surface, the second radius side of the sector is on the same plane as the light-incident surface, the second radius side and the arc side are located on the right side of the first radius side, and the radius of the arc side is 0.03-0.1 mm; the upper side of the upper prism sheet is uniformly provided with a plurality of long strip-shaped oblique upper prisms, the rear end of the upper prism is inclined to the right, and the front end of the upper prism is inclined to the left.

7. The backlight module capable of weakening the front unidirectional oblique light beam of the backlight source lamp according to claim 6, characterized in that: The radius of the arc side is 0.05-0.08 mm; the upper side of the lower prism sheet is uniformly provided with a plurality of long strip-shaped oblique lower prisms, the rear end of the lower prism is inclined to the left, and the front end of the lower prism is inclined to the right.

8. The backlight module capable of weakening the front unidirectional oblique light beam of the backlight source lamp according to claim 6, characterized in that: The backlight source is an LED, the lower side of the light guide plate is a dot face, the upper side of the light guide plate is a light-incident surface, the light-incident surface is provided with a plurality of V-shaped grooves at equal intervals, and the length direction of the V-shaped grooves is perpendicular to the light-incident surface of the light guide plate.

9. A backlight module capable of weakening the unidirectional oblique light beam in front of the backlight source lamp, comprising a light guide plate, a backlight source, a reflecting sheet, a diffusion sheet, a lower prism sheet and an upper prism sheet, the light guide plate comprises a light guide plate main body part, the front end of the light guide plate main body part is integrally connected with a wedge-shaped structure part, the front side of the wedge-shaped structure part is a light inlet face, the backlight source is arranged in front of the wedge-shaped structure part, the reflecting sheet is installed on the lower side of the light guide plate, the diffusion sheet is installed on the upper side of the light guide plate main body part, the lower prism sheet is installed on the upper side of the diffusion sheet, and the upper prism sheet is installed on the upper side of the lower prism sheet, characterized in that: The light-incident surface of the wedge-shaped structure part is provided with a plurality of vertical fourth microstructure grooves at equal intervals, the projection of the fourth microstructure grooves on a horizontal plane is a sector, the central angle of the sector is a right angle, the first radius side of the sector is perpendicular to the light-incident surface, the second radius side of the sector is on the same plane as the light-incident surface, the second radius side and the arc side are located on the left side of the first radius side, and the radius of the arc side is 0.03-0.1 mm; the upper side of the upper prism sheet is uniformly provided with a plurality of long strip-shaped oblique upper prisms, the rear end of the upper prism is inclined to the left, and the front end of the upper prism is inclined to the right.

10. The backlight module capable of weakening the front unidirectional oblique light beam of the backlight source lamp according to claim 6, characterized in that: The radius of the arc side is 0.05-0.08 mm; the upper side of the lower prism sheet is uniformly provided with a plurality of long strip-shaped oblique lower prisms, the rear end of the lower prism is inclined to the right, and the front end of the lower prism is inclined to the left; the backlight source is an LED, the lower side of the light guide plate is a dot face, the upper side of the light guide plate is a light-incident surface, the light-incident surface is provided with a plurality of V-shaped grooves at equal intervals, and the length direction of the V-shaped grooves is perpendicular to the light-incident surface of the light guide plate.

Images