High-brightness backlight module and vehicle-mounted display screen

Abstract

The invention relates to the technical field of display, and discloses a high-brightness backlight module and a vehicle-mounted display screen, and the high-brightness backlight module comprises a first prism light guide film, a second prism light guide film, a light guide plate and an LED light source assembly, the first prism light guide film and the second prism light guide film are sequentially arranged on the side where the light-emitting face of the light guide plate is located. A first microstructure is arranged on the light-emitting surface of the light guide plate, and a second microstructure is arranged on the reflecting surface of the light guide plate; a first prism sheet of the first prism light guide film is arranged back to the surface of the light guide plate; and a second prism sheet of the second prism light guide film is arranged opposite to the surface where the first prism sheet is located. According to the backlight module provided by the invention, the biprism light guide film is arranged on the light-emitting surface of the light guide plate, and the prismatic lenses of the biprism light guide film are back to the light guide plate, so that the light emitted from the light-emitting surface of the light guide plate is converted into the light emitted at 0 degree without energy loss, and the backlight module has relatively strong light collimation and high brightness.

Description

Technical Field

[0001] The invention belongs to the field of display technology, and in particular relates to a high-brightness backlight module and a vehicle-mounted display screen. Background Art

[0002] With the rapid development of intelligent technology, LCD has become standard for vehicle-mounted central control and instrument screens.

[0003] The liquid crystal panel of LCD does not have the ability to emit light on its own. It must rely on the backlight and liquid crystal layer to control the light emission and color changes. The backlight provides the light source required for the LCD, and the liquid crystal panel controls the intensity of light emitted by the backlight by controlling the deflection of liquid crystal molecules, thereby controlling the changes in brightness and color.

[0004] For car-mounted displays, window reflections are a major safety issue that is difficult to avoid in current car driving. Window reflections mean that the image displayed on the car-mounted display will be reflected on the side windows or front windshield. In a night driving environment, it will seriously affect the driver's observation of the road conditions ahead and the rearview mirror image.

[0005] The main method for existing car display screens to deal with this problem is to add an anti-peep film to the backlight. Generally, the car display screen is required to have the ability to prevent peeping from the top and bottom, and the instrument and co-pilot screen are required to have the ability to prevent peeping from the left and right. The structure of the anti-peep film is similar to that of a Venetian blind. Its core principle is the ultra-fine Venetian blind. The structure of the anti-peep film can be imagined as a Venetian blind reduced by tens of thousands of times. The grating structure arranged in parallel absorbs large-angle light, transmits small-angle light, and controls the light output angle of the backlight source to achieve the anti-peep effect. On the car display screen, it is reflected by blocking large-angle light reflected on the side windows and windshield, reducing the reflection of the car window.

[0006] Since anti-peeping films absorb large-angle light through parallel arranged grating structures, transmit small-angle light, and control the light output angle of the backlight source to achieve the anti-peeping effect, it will cause a certain brightness loss of the light emitted by the backlight source.

[0007] Some car models now have relatively high brightness requirements when choosing car displays. The brightness loss of the anti-peep film requires the backlight to have a higher brightness to meet the target requirements. However, achieving a higher brightness of the backlight will lead to a series of problems such as high cost and high surface temperature rise, thereby increasing the design cost.

[0008] In order to improve the brightness or lighting effect of the vehicle display, a brightness enhancement film with a top angle of 90° is set in the light-emitting direction of the backlight source to converge the light. The best convergence angle of the brightness enhancement film is 45° incident light. After the 45° light passes through the brightness enhancement film, it will form 0° collimated light. At this time, the energy is fully utilized, the lighting effect is the highest, and the module brightness is the highest.

[0009] However, in the existing backlight module, the light output of the light guide plate is concentrated at 70°~88°. The light needs to be deflected by the diffusion film to about 55° before entering the brightness enhancement film. Since the brightness enhancement film only has a strong focusing effect on light at a certain angle, some light is wasted, and there will be energy loss every time the light passes through the brightness enhancement film. Therefore, after the light passes through the focusing effect of the brightness enhancement film, it will cause an energy loss of about 20%. Summary of the invention

[0010] In order to solve the problems that the backlight module in the prior art uses a conventional brightness enhancement film to gather light, resulting in large viewing angle energy loss, poor focusing effect, and low brightness at the center of the backlight module, the present invention provides a high-brightness backlight module and a vehicle-mounted display screen.

[0011] The technical effects to be achieved by the present invention are achieved through the following technical aspects:

[0012] In a first aspect, the present invention provides a high-brightness light guide plate, comprising: a first prism light guide film, a second prism light guide film, a light guide plate and an LED light source assembly, wherein the light guide plate has a light incident surface, a light emitting surface and a reflective surface, the LED light source assembly is arranged on the side where the light incident surface of the light guide plate is located, and the first prism light guide film and the second prism light guide film are arranged in sequence on the side where the light emitting surface of the light guide plate is located; a first microstructure is provided on the light emitting surface of the light guide plate, and a second microstructure is provided on the reflective surface of the light guide plate; the first prism light guide film comprises a first optical film and a plurality of first prism sheets, and the plurality of first prism sheets are arranged on the surface of the first optical film which is away from the light guide plate; the second prism light guide film comprises a second optical film and a plurality of second prism sheets, and the plurality of second prism sheets are arranged on the surface of the second optical film which is away from the first prism sheet.

[0013] In some optional implementations, the first prism light guide film and the second prism light guide film are arranged in parallel.

[0014] In some optional implementations, a plurality of the first prism sheets are arranged continuously and in parallel, and an extension direction of the first prism sheets is perpendicular to a light emitting direction of the LED light source assembly;

[0015] A plurality of the second prism sheets are arranged continuously and in parallel, and an extending direction of the second prism sheets is perpendicular to a light emitting direction of the LED light source assembly.

[0016] In some optional implementations, when a cross section is taken along the light emitting direction of the LED light source assembly, the cross-sectional shape of the first prism sheet is a triangle; and the cross-sectional shape of the second prism sheet is a right-angled equilateral triangle.

[0017] In some optional implementations, the angle setting range of the first bottom angle of the first prism sheet is 30°-70°, the angle setting range of the second bottom angle of the first prism sheet is 40°-80°, and the angle setting range of the first top angle of the first prism sheet is 60°-100°.

[0018] In some optional implementations, the first microstructure includes a plurality of first protrusion structures that are arranged in parallel and continuously, and the plurality of first protrusion structures are columnar structures and extend along the light emitting direction of the LED light source assembly; the second microstructure includes a plurality of second protrusion structures, and the plurality of second protrusion structures are arranged at intervals and staggered, and the second protrusion structures are wedge-shaped structures.

[0019] In some optional implementations, when a cross-section is taken along the light incident surface of the light guide plate, the cross-section of the first raised structure is arc-shaped, and the arc surface of the first raised structure is arranged opposite to the LED light source assembly; the light-facing surface of the second raised structure is arranged relative to the LED light source assembly, the light-facing angle of the second raised structure is set to 1 to 8°, and the backlight angle of the second raised structure is set to 70°-90°.

[0020] In some optional implementations, the length of the second protruding structure is set in a range of 100um-120um, the width of the second protruding structure is set in a range of 90um-110um, and the height of the second protruding structure is set in a range of 1.50um-8um;

[0021] Wherein, the width of the second protruding structure is smaller than the length of the second protruding structure.

[0022] In some optional implementations, it further includes: a reflective plate and a diffuser plate, wherein the reflective plate is arranged on the side where the reflective surface of the light guide plate is located, and the diffuser plate is arranged on the side where the second prism sheet of the second prism light guide film is located.

[0023] In a second aspect, the present invention provides a vehicle-mounted display screen, comprising the high-brightness backlight module as described above.

[0024] In summary, the present invention has at least the following benefits:

[0025] 1. The backlight module provided by the present invention realizes the convergence of the outgoing light by arranging microstructures on both the light emitting surface and the reflecting surface of the light guide plate, so that the light emitted from the light guide plate has high convergence and directivity; a double prism light guide film is arranged on the light emitting surface of the light guide plate, and the prism sheets of the double prism light guide film are designed to face away from the light guide plate, so that the light emitted from the light emitting surface of the light guide plate is converted into a light emitted at 45° after passing through the first prism light guide film, and the light emitted at 45° is converted into a light emitted at 0° with almost no energy loss after passing through the second prism light guide film, so that the backlight module has strong light collimation, avoids light loss and waste of large viewing angle, and achieves the purpose of brightening and increasing efficiency.

[0026] 2. The vehicle-mounted display screen provided by the present invention, by adopting the above-mentioned backlight module, efficiently converts the light emitted by the LED light source assembly into brightness, so that the vehicle-mounted display screen achieves a higher lighting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a high-brightness backlight module provided by an embodiment of the present invention.

[0028] Figure 2 A side view of a high-brightness backlight module provided by an embodiment of the present invention.

[0029] Figure 3 A schematic structural diagram of a light guide plate provided in an embodiment of the present invention.

[0030] Figure 4 A schematic diagram of the light path of a high-brightness backlight module provided in an embodiment of the present invention.

[0031] Markings in the figure:

[0032] 1. The first prism light guide film;

[0033] 11. A first optical film;

[0034] 12. The first prism;

[0035] 121, first bottom angle; 122, second bottom angle; 123, first top angle;

[0036] 2. Second prism light guide film;

[0037] 21. A second optical film;

[0038] 22. A second prism sheet;

[0039] 221, third bottom angle; 222, second top angle;

[0040] 3. Light guide plate;

[0041] 31. Light-entering surface;

[0042] 32. Bright surface;

[0043] 33. Reflective surface;

[0044] 34. First microstructure;

[0045] 35. Second microstructure;

[0046] 351, front light angle; 352, back light angle;

[0047] 4. LED light source components;

[0048] 5. Diffuser plate;

[0049] 6. Reflector. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In order to solve the problems in the prior art that the backlight module uses a conventional light-enhancing film to converge light, resulting in large viewing angle energy loss, poor focusing effect, low brightness in the center of the backlight module, etc., the present embodiment provides a high-brightness backlight module. The high-brightness backlight module converges the outgoing light by arranging microstructures on both the light-emitting surface and the reflecting surface of the light guide plate, so that the light emitted from the light guide plate has high convergence and directivity; a double-prism light-guiding film is arranged on the light-emitting surface of the light guide plate, and the prism sheets of the double-prism light-guiding film are designed to face away from the light guide plate, so that the light emitted from the light-emitting surface of the light guide plate is converted into 0° outgoing light without energy loss, has strong light collimation and high brightness, avoids light loss and large viewing angle waste, and achieves the purpose of brightening and increasing efficiency.

[0053] In this embodiment, the high brightness backlight module is as follows Figure 1As shown, it includes: a first prism light guide film 1, a second prism light guide film 2, a light guide plate 3 and an LED light source assembly 4, the light guide plate 3 has a light incident surface 31, a light emitting surface 32 and a reflective surface 33, the LED light source assembly 4 is arranged on the side of the light incident surface 31 of the light guide plate 3, the first prism light guide film 1 and the second prism light guide film 2 are arranged in sequence on the side of the light emitting surface 32 of the light guide plate 3; a first microstructure 34 is provided on the light emitting surface 32 of the light guide plate 3, and a second microstructure 35 is provided on the reflective surface 33 of the light guide plate 3; the first prism light guide film 1 includes a first optical film 11 and a plurality of first prism films 12, and the plurality of first prism films 12 are arranged on the surface of the first optical film 11 which is opposite to the light guide plate 3; the second prism light guide film 2 includes a second optical film 21 and a plurality of second prism films 22, and the plurality of second prism films 22 are arranged on the surface of the second optical film 21 which is opposite to the first prism films 12.

[0054] The backlight module provided in this embodiment, by means of a first microstructure 34 provided on the light emitting surface 32 of the light guide plate 3 and a second microstructure 35 provided on the reflective surface 33 of the light guide plate 3, enables the light emitting angle of the light guide plate 3 to be larger, the light rays to be more convergent, the light emitting angle to be concentrated at about 80°, less stray light, and to have convergence and directionality.

[0055] Then, a first prism light guide film 1 and a second prism light guide film 2 are arranged on the side where the light emitting surface 32 of the light guide plate 3 is located, wherein the first prism light guide film 1 adopts a special structural design, and its first prism sheet 12 is designed to be facing away from the light guide plate 3, so as to concentrate the light emitted from the light guide plate 3 at about 45°. The second prism light guide film 2 adopts a conventional structural design, that is, the vertex angle of the second prism sheet 22 of the second prism light guide film 2 is 90°, and the second prism sheet 22 of the second prism light guide film 2 is also designed to be facing away from the light guide plate 3, so as to converge the light emitted from the first prism light guide film 1 into 0° collimated light with almost no energy loss, so that the backlight module has a strong light collimation, at which time the energy is fully utilized, the light efficiency is the highest, the module brightness is the highest, and the light loss and large viewing angle waste are avoided, so as to achieve the purpose of brightening and increasing efficiency.

[0056] As a preferred embodiment, this embodiment optimizes the specific structure of the light guide plate 3.

[0057] like Figure 2-3 As shown, the first microstructure 34 includes a plurality of first protruding structures that are arranged in parallel and continuously, and the plurality of first protruding structures are columnar structures and extend along the light emitting direction of the LED light source assembly 4 .

[0058] Preferably, the cross section is taken along the light emitting direction perpendicular to the LED light source assembly 4, which can also be understood as the cross section taken along the light incident surface 31 of the light guide plate 3, and the cross section of the first protruding structure is arc-shaped, and the arc surface of the first protruding structure is arranged opposite to the LED light source assembly 4.

[0059] By providing a plurality of continuous first protrusion structures on the light emitting surface 32 of the light guide plate 3 , it is possible to converge light rays at multiple angles, so that the light rays emitted from the light emitting surface 32 of the light guide plate 3 have a higher convergence.

[0060] In this embodiment, which is a preferred embodiment, the radius and height of the first protruding structure are designed according to the design lighting requirements.

[0061] Preferably, the length of the first protruding structure is the same as that of the light guide plate 3, the radius of the first protruding structure is set to 35um-45um, the bottom width of the first protruding structure is set to 35um-45um, and the height of the first protruding structure is set to 2um-8um.

[0062] In addition, it should be noted that the bottom width of the first protruding structure is smaller than the radius of the first protruding structure.

[0063] This embodiment is a preferred embodiment. After a large amount of test data, the radius of the first protruding structure is set to 40um, the bottom width of the first protruding structure is set to 38.5um, and the height of the first protruding structure is set to 5um. The cylindrical surface of the first protruding structure mainly plays the role of converging light. The light with the highest convergence effect can be obtained through the light guide plate 3.

[0064] In addition, the second microstructure 35 includes a plurality of second protruding structures, which are spaced apart and staggered, and are wedge-shaped structures.

[0065] Preferably, in a cross section taken along the light emitting direction of the LED light source assembly 4 , the second protruding structure is in a triangular shape.

[0066] The light-facing surface of the second protruding structure is arranged relative to the LED light source assembly 4, the light-facing angle 351 of the second protruding structure is set to 1-8°, and the backlight angle 352 of the second protruding structure is set to 70°-90°.

[0067] In this embodiment, the angle at which the totally reflected light in the light guide plate 3 is emitted from the light guide plate 3 is controlled by controlling the incident light angle 351 of the second protruding structure.

[0068] Therefore, the incident light angle 351 of the second protruding structure can be optimized according to the shape of the first prism sheet 12 of the first prism light guide film 1, and the backlight angle 352 of the second protruding structure is as close to 90° as possible, so that the light emitted from the light guide plate 3 can have higher directivity.

[0069] In this embodiment, which is a preferred embodiment, the incident light angle 351 of the second protruding structure is optimally set to 1° to 3°, and the backlight angle 352 of the second protruding structure is optimally set to 88° to 90°.

[0070] In the actual production process of the backlight module of this embodiment, based on the actual production process, a too large backlight angle 352 of the second protruding structure may lead to problems such as difficulty in demoulding. The light angle 351 of the second protruding structure is set to 3°~6°, and the backlight angle 352 of the second protruding structure is set to 75°-85°.

[0071] Specifically, the backlight angle 352 of the second protruding structure is set to 80°, and the incident light angle 351 of the second protruding structure is set to 1° to 2°.

[0072] In this embodiment, the second protrusion structure is mainly used to refract and reflect light, so that the light emitted from the light guide plate 3 has higher directivity.

[0073] In this embodiment, the number and interval of the second protruding structures can be set according to the distance between two adjacent LED light sources of the LED light source assembly 4 .

[0074] Preferably, the length of the second protruding structure is set in the range of 100um-120um, the width of the second protruding structure is set in the range of 90um-110um, and the height of the second protruding structure is set in the range of 1.50um-8um.

[0075] The width of the second protruding structure is smaller than the length of the second protruding structure, and the specific parameter setting can be set according to the distance between two adjacent LED light sources of the LED light source assembly 4 .

[0076] In this embodiment, by optimizing the structure of the light guide plate 3 and optimizing the specific structures of the first protrusion structure and the second protrusion structure, the light emitted from the light guide plate 3 has higher convergence and directivity, so that the angle of the light emitted from the light guide plate 3 is concentrated at about 80°.

[0077] As a preferred embodiment, this embodiment optimizes the specific structures of the first prism light guide film 1 and the second prism light guide film 2 .

[0078] like Figure 2-3 As shown, the first prismatic light guide film 1 and the second prismatic light guide film 2 are both arranged parallel to the light guide plate 3 .

[0079] The specific structures of the first prism light guide film 1 and the second prism light guide film 2 are as follows:

[0080] The first prism light guide film 1 includes a first optical film 11 and a plurality of first prism films 12. The plurality of first prism films 12 are arranged on the surface of the first optical film 11 which is opposite to the light guide plate 3. The plurality of first prism films 12 are arranged continuously and in parallel, and the extension direction of the first prism films 12 is perpendicular to the light emitting direction of the LED light source assembly 4.

[0081] Furthermore, when the cross section is taken along the light emitting direction of the LED light source assembly 4 , the cross section of the first prism sheet 12 is in a triangular shape.

[0082] This embodiment is a preferred embodiment. In order to ensure that the first prism light guide film 1 can convert the highly convergent and highly directional light emitted through the light guide plate 3 from 80° to 45° without loss, the structure of the first prism sheet 12 is optimized.

[0083] Specifically, the first bottom angle 121 of the first prism sheet 12 is set in an angle range of 30°-70°, the second bottom angle 122 of the first prism sheet 12 is set in an angle range of 40°-80°, and the first top angle 123 of the first prism sheet 12 is set in an angle range of 60°-100°.

[0084] The first bottom angle 121 is a front-light angle, and the second bottom angle 122 is a backlight angle.

[0085] Preferably, the first bottom angle 121 of the first prism sheet 12 is set in an angle range of 45°-55°, the second bottom angle 122 of the first prism sheet 12 is set in an angle range of 55°-65°, and the first top angle 123 is set in an angle range of 75°-85°.

[0086] The first prism light guide film 1 provided in this embodiment is used to cooperate with the light guide plate 3 described above to convert the light emitted through the light guide plate 3 from 80° to 45° without loss.

[0087] Therefore, preferably, the angle of the first vertex angle 123 of the first prism sheet 12 is set to 80°, and the angles of the first bottom angle 121 and the second bottom angle 122 of the first prism sheet 12 are adjusted according to actual needs.

[0088] That is, it can be understood that the angle settings of the first bottom angle 121, the second bottom angle 122 and the first top angle 123 of the first prism 12 can be adjusted according to the specific structure of the light guide plate 3 to guide the light emitted through the light guide plate 3 from 80° to 45° without loss.

[0089] The second prism light-guiding film 2 includes a second optical film 21 and a plurality of second prism films 22 . The plurality of second prism films 22 are arranged on the surface of the second optical film 21 which is away from the first prism film 12 . The plurality of second prism films 22 are arranged continuously and in parallel, and the extension direction of the second prism films 22 is perpendicular to the light emitting direction of the LED light source assembly 4 .

[0090] Furthermore, when the cross section is taken along the light emitting direction of the LED light source assembly 4 , the cross section of the second prism sheet 22 is in the shape of a right-angled equilateral triangle.

[0091] Specifically, the angle of the third bottom angle 221 of the second prism sheet 22 is set to 45°, and the angle of the second top angle 222 of the second prism sheet 22 is 90°.

[0092] A second prism light-guiding film 2 with a vertex angle of 90° is set in the light-emitting direction of the first prism light-guiding film 1 to converge the light. In view of the fact that the best convergence angle of the second prism light-guiding film 2 is the light incident at 45°, the first prism light-guiding film 1 cooperates with the first prism light-guiding film 1 to convert the 45° light emitted through the first prism light-guiding film 1 into 0° collimated light, and the light energy passing through the first prism light-guiding film 1 and the second prism light-guiding film 2 is fully utilized, with the highest light efficiency and the highest brightness of the backlight module.

[0093] This embodiment is a preferred embodiment. Figure 4 As shown, the backlight module further includes: a reflective plate 6 and a diffuser plate 5 . The reflective plate 6 is arranged on the side where the reflective surface 33 of the light guide plate 3 is located, and the diffuser plate 5 is arranged on the side where the second prism sheet 22 of the second prism light guide film 2 is located.

[0094] The reflective plate 6 is set to cooperate with the second microstructure 35 of the light guide plate 3 to reflect light at some angles to reduce light loss and waste at a large viewing angle. The diffuser plate 5 is set to diffuse the light emitted through the second prism light guide film 2 to achieve the purpose of brightening and increasing efficiency, while making the illumination of the backlight module more uniform.

[0095] In some optional embodiments, the present invention further provides a vehicle-mounted display screen, which includes a high-brightness backlight module as described in any of the above embodiments, so as to solve the problems of low central brightness and uneven illumination existing in existing vehicle-mounted display screens to a certain extent.

[0096] The vehicle-mounted display screen provided in this embodiment, by adopting the backlight module described in any of the above embodiments, efficiently and losslessly converts the light emitted by the LED light source assembly into brightness, so that the vehicle-mounted display screen achieves a higher lighting effect.

[0097] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0098] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0099] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0100] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0101] Although the present invention is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A high brightness backlight module, characterized in that: include: A first prism light guide film (1), a second prism light guide film (2), a light guide plate (3) and an LED light source assembly (4); the light guide plate (3) has a light incident surface (31), a light emitting surface (32) and a reflection surface (33); the LED light source assembly (4) is arranged on the side where the light incident surface (31) of the light guide plate (3) is located; the first prism light guide film (1) and the second prism light guide film (2) are arranged in sequence on the side where the light emitting surface (32) of the light guide plate (3) is located; a first microstructure (34) is provided on the light emitting surface (32) of the light guide plate (3); The reflective surface (33) of the light guide plate (3) is provided with a second microstructure (35); the first prism light guide film (1) comprises a first optical film (11) and a plurality of first prism sheets (12), wherein the plurality of first prism sheets (12) are arranged on the surface of the first optical film (11) facing away from the light guide plate (3); the second prism light guide film (2) comprises a second optical film (21) and a plurality of second prism sheets (22), wherein the plurality of second prism sheets (22) are arranged on the surface of the second optical film (21) facing away from the first prism sheet (12).

2. The high brightness backlight module according to claim 1, characterized in that: The first prism light guide film (1) and the second prism light guide film (2) are arranged in parallel.

3. The high brightness backlight module according to claim 1, characterized in that: A plurality of the first prism sheets (12) are arranged continuously and in parallel, and the extension direction of the first prism sheets (12) is perpendicular to the light emitting direction of the LED light source assembly (4); A plurality of the second prism sheets (22) are arranged continuously and in parallel, and the extension direction of the second prism sheets (22) is perpendicular to the light emitting direction of the LED light source assembly (4).

4. The high brightness backlight module according to claim 1, characterized in that: Taking a cross section along the light emitting direction of the LED light source assembly (4), the cross-sectional shape of the first prism sheet (12) is a triangle; and the cross-sectional shape of the second prism sheet (22) is a right-angled equilateral triangle.

5. The high brightness backlight module according to claim 4, characterized in that: The angle setting range of the first bottom angle (121) of the first prism sheet (12) is 30°-70°, the angle setting range of the second bottom angle (122) of the first prism sheet (12) is 40°-80°, and the angle setting range of the first top angle (123) of the first prism sheet (12) is 60°-100°.

6. The high brightness backlight module according to claim 1, characterized in that: The first microstructure (34) comprises a plurality of first protruding structures which are arranged in parallel and continuously, and the plurality of first protruding structures are columnar structures and extend along the light emitting direction of the LED light source assembly (4); the second microstructure (35) comprises a plurality of second protruding structures, and the plurality of second protruding structures are arranged at intervals and in a staggered manner, and the second protruding structures are wedge-shaped structures.

7. The high brightness backlight module according to claim 6, characterized in that: When a cross section is taken along the light incident surface (31) of the light guide plate (3), the cross section of the first protruding structure is arc-shaped, and the arc surface of the first protruding structure is arranged opposite to the LED light source assembly (4); the light-facing surface of the second protruding structure is arranged relative to the LED light source assembly (4), the light-facing angle (351) of the second protruding structure is set to 1 to 8 degrees, and the backlight angle (352) of the second protruding structure is set to 70 degrees to 90 degrees.

8. The high brightness backlight module according to claim 6, characterized in that: The length of the second protruding structure is set in the range of 100um-120um, the width of the second protruding structure is set in the range of 90um-110um, and the height of the second protruding structure is set in the range of 1.50um-8um; Wherein, the width of the second protruding structure is smaller than the length of the second protruding structure.

9. The high brightness backlight module according to claim 1, characterized in that: Also includes: A reflective plate (6) and a diffuser plate (5), wherein the reflective plate (6) is arranged on the side where the reflective surface (33) of the light guide plate (3) is located, and the diffuser plate (5) is arranged on the side where the second prism sheet (22) of the second prism light guide film (2) is located.

10. A vehicle-mounted display screen, characterized in that: It comprises the high brightness backlight module as described in any one of claims 1 to 9.

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