A novel collimating backlight module and a display

Abstract

The present invention provides a novel collimating backlight module and a display; the novel collimating backlight module includes a reflective film, a first light-emitting plate, a second light-emitting plate, a first brightness enhancement film, and a second brightness enhancement film stacked in sequence from bottom to top; the first light-emitting plate and the second light-emitting plate cooperate with each other to make the emitted light exit within a certain angular range with respect to the first brightness enhancement film and the second brightness enhancement film, so as to achieve collimated light emission, and the first brightness enhancement film and the second brightness enhancement film with mutually perpendicular microstructural directions broaden the light-emitting angles in the second cross-sectional direction and the first cross-sectional direction. In addition, a protective film can be provided between the first light-emitting plate and the second light-emitting plate to avoid damage caused by friction between the first light-emitting plate and the second light-emitting plate. The present invention can achieve that the brightness has no large fluctuation within a 20° viewing angle, the brightness is greatly attenuated within a 20° to 30° viewing angle, and almost completely anti-peeping outside a 30° viewing angle during application; and it also greatly improves the overall brightness of the backlight module.

Description

Technical Field

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

[0002] With the rapid development of intelligent technologies, automotive users' requirements for the display effect of in-vehicle displays have become increasingly stringent, and there are more specific requirements for the brightness of the display at different viewing angles. On the one hand, it is desired that the brightness at a large viewing angle be as low as possible to avoid reflection onto the window and interfering with the driver's forward and rearview mirror vision. On the other hand, it is necessary to ensure that the information on the co-pilot's display does not distract the attention of the driver in the driver's seat.

[0003] Based on this demand, many customers require anti-peeping for the display. The industry's implementation methods mostly involve assembling a light control film inside the backlight. Currently, the light control films on the market are all implemented through the louver structure developed by 3M. This structure absorbs the light at a large viewing angle through the louver structure, resulting in a significant decrease in brightness at a large viewing angle. However, the disadvantage is that the brightness of all viewing angles, including the vertical viewing angle, will decrease by 20% - 30%. Without increasing the number or intensity of light sources, the brightness requirements of customers for the display cannot be met. On the other hand, the light energy absorbed by this light control film is dissipated as heat inside the backlight, causing more heat accumulation on the entire screen surface, and often unable to meet the vehicle regulations requirements. In addition, customers have gradually had higher requirements for the anti-peeping viewing angle and anti-peeping effect. Currently, the light collection effect of the light control film cannot meet the customer's needs.

[0004] Moreover, many of the collimated backlight modules on the market face the problem of being unable to be mass-produced, and quite a number of products that achieve collimated backlight cannot pass the vehicle regulation-level experimental standards due to their overly fine structures. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a novel collimated backlight module and a display, which can achieve that external incident light can be emitted within a certain angular range by setting the microstructures of the first backlight layer and the second backlight layer.

[0006] Specifically, the present invention provides a novel collimated backlight module, which at least includes a first backlight layer; the first backlight layer at least includes a first light-emitting plate and a second light-emitting plate; light-emitting structures are respectively arranged on the upper and lower surfaces of the first light-emitting plate to concentrate the angle of the emitted light in the normal direction of the first light-emitting plate on the first cross-section, and to deviate the emitted light from the normal direction of the first light-emitting plate within a first preset angular range on the second cross-section; the emitted light is deflected to the normal direction of the first light-emitting plate through the refraction of the second light-emitting plate; the first light-emitting plate and the second light-emitting plate cooperate with each other to make the external incident light be emitted within a second preset angular range.

[0007] Wherein, the novel collimating backlight module further includes a second backlight layer, a reflective film and a light source.

[0008] The reflective film, the first light emitting plate, the second light emitting plate and the second backlight layer are stacked in sequence from bottom to top; and the light source is arranged on one side of the first light emitting plate.

[0009] The first light emitting plate is surrounded by a first light emitting surface, a second light emitting surface, a light incident surface facing the light source, a first side surface and a second side surface.

[0010] The first light emitting surface is arranged on a side of the first light emitting plate facing the reflective film; and the second light emitting surface is arranged on a side of the first light emitting plate facing away from the reflective film.

[0011] A plurality of first light emitting strips arranged in sequence are disposed on the first light emitting surface. The first light emitting strips extend from the first side surface to the second side surface, and a first cross section of the first light emitting strip is in an arc shape.

[0012] A plurality of second light emitting strips are arranged between adjacent first light emitting strips in the extending direction of the first light emitting strips. The second light emitting strips are of a quadrangular pyramid structure, and a second cross section of the second light emitting strip is a trapezoid with the hypotenuse facing upward.

[0013] A plurality of sequentially arranged third light emitting strips are disposed on the second light emitting surface, the extension direction of the third light emitting strips is perpendicular to the extension direction of the first light emitting strips, and the second cross section of the third light emitting strips is a first rounded triangle.

[0014] A fourth light emitting strip is arranged between the preset third light emitting strips, the extension direction of the fourth light emitting strip is the same as the extension direction of the third light emitting strip, and the second cross section of the fourth light emitting strip is a second rounded triangle.

[0015] A plurality of fifth light emitting strips are arranged in sequence in the extension direction of the third light emitting strips between adjacent third light emitting strips and between the third light emitting strips and the fourth light emitting strips. The fifth light emitting strips are of a quadrangular pyramid structure, and a first cross section of the fifth light emitting strip is a trapezoid with the hypotenuse facing upward.

[0016] The height L1 of the first rounded triangle is smaller than the height L2 of the second rounded triangle.

[0017] The second light output plate is used to deflect the emitted light to the normal direction of the first light output plate, thereby completing collimated light output; the second light output plate has a microstructured side facing the second light output surface; the microstructures are arranged in sequence and extend in the extension direction of the first light output strip, and the first cross-section of the microstructure is an isosceles triangle.

[0018] The second backlight layer includes a first brightness enhancement plate and a second brightness enhancement plate, and is configured to expand the viewing angle in the second cross-sectional direction and the first cross-sectional direction.

[0019] The first brightness enhancement plate is superposed with the second light-emitting plate. A plurality of first brightness enhancement strips are arranged on a surface of the first brightness enhancement plate facing away from the second light-emitting plate. The first brightness enhancement strips extend in the extending direction of the first light-emitting strips, and a first cross-section of the first brightness enhancement strips is arc-shaped.

[0020] The second brightness enhancement plate is superposed with the first brightness enhancement plate. A plurality of second brightness enhancement strips are arranged on a surface of the second brightness enhancement plate facing away from the first brightness enhancement plate. The second brightness enhancement strips extend in the extending direction of the third light-emitting strips, and a second cross-section of the second brightness enhancement strips is arc-shaped.

[0021] A protective film may be disposed between the first light-emitting plate and the second light-emitting plate.

[0022] A frame structure member is provided to semi-surround the reflective film, the first light-emitting plate, the second light-emitting plate, the first brightness enhancement plate, and the second brightness enhancement plate. The frame structure member covers two ends of the second brightness enhancement plate with a preset size.

[0023] Based on the same inventive concept, the present invention further provides a display, which is a type of liquid crystal display, and the display at least includes the novel collimated backlight module.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The first light-emitting plate of the present invention is configured to concentrate the angle of the emitted light in the normal direction of the first light-emitting plate in the second cross-section, and deviate the emitted light from the normal direction of the first light-emitting plate by a first preset angle range in the first cross-section, and then deflect the emitted light to the normal direction of the first light-emitting plate through the refraction of the second light-emitting plate, so as to achieve the effect of collimated light emission; and a first brightness enhancement plate and a second brightness enhancement plate with perpendicular directions are further arranged on the second light-emitting plate, and the collimated incident light in the -10° to 10° direction is refracted and deflected, and the light-emitting angle is widened to -20° to 20°. Between 20° and 30°, the viewing angle brightness can maintain a sharp drop like a cliff, and the brightness outside the 30° viewing angle is attenuated by more than 90% compared with the brightness at the 0° viewing angle, so as to achieve the anti-peeping effect.

[0026] In addition, the present invention has a high light utilization rate, and the backlight brightness is increased by more than 50% compared with the traditional backlight module, which can meet the brightness requirements of customers for the display screen. Description of the Drawings

[0027] Figure 1Schematic diagram of the novel collimating backlight module according to the present invention.

[0028] Figure 2 is Figure 1 Schematic diagram of the first light-emitting surface described above.

[0029] Figure 3 is Figure 1 Schematic diagram of the second light-emitting surface described above.

[0030] Figure 4 is Figure 1 Schematic cross-sectional view of the second light-emitting surface in the second cross-section described above.

[0031] Figure 5 is Figure 1 Schematic cross-sectional view of the first brightness enhancement plate or the second brightness enhancement plate described above.

[0032] Figure 6 Is the light-emitting schematic diagram of the collimating backlight module of an embodiment.

[0033] Figure 7 Is the schematic diagram of the viewing angle brightness ratio without adding a brightness enhancement plate.

[0034] Figure 8 Is the schematic diagram of the viewing angle brightness ratio after adding a brightness enhancement plate.

[0035] Wherein, 1 - the first backlight layer, 11 - the first light-emitting plate, 12 - the second light-emitting plate, 13 - the first light-emitting surface, 131 - the first light-emitting strip, 132 - the second light-emitting strip, 14 - the second light-emitting surface, 141 - the third light-emitting strip, 142 - the fourth light-emitting strip, 143 - the fifth light-emitting strip, 144 - the first rounded triangle, 145 - the second rounded triangle, 15 - the light-incident surface, 16 - the first side surface, 17 - the second side surface, 2 - the second backlight layer, 21 - the first brightness enhancement plate, 211 - the first brightness enhancement strip, 22 - the second brightness enhancement plate, 221 - the second brightness enhancement strip, 3 - the reflection film, 4 - the light source, 5 - the protective film, 6 - the frame structure member. Detailed implementation manners

[0036] The embodiments of the present invention provide a novel collimating backlight module and a display, which are used to solve the problems of anti-peeping effect and viewing angle brightness decline of the backlight module in the prior art.

[0037] The embodiments of the present invention provide a novel collimating backlight module, and the general idea is as follows:

[0038] The novel collimating backlight module includes a reflective film 3, a first light-emitting plate 11, a second light-emitting plate 12, a first brightness enhancement film 21, and a second brightness enhancement film 22 stacked in sequence from bottom to top; the first light-emitting plate 11 is used to concentrate the emitted light in the normal direction of the first light-emitting plate on the second cross-section, and deviate the emitted light from the normal direction of the first light-emitting plate by a first preset angle range on the first cross-section, and then deflect the emitted light to the normal direction of the first light-emitting plate through the second light-emitting plate 12, so as to achieve collimated light output, and the light output angles in the second cross-section direction and the first cross-section direction are broadened by the first brightness enhancement film 21 and the second brightness enhancement film 22 with mutually perpendicular directions. In addition, a protective film 5 can be arranged between the first light-emitting plate 11 and the second light-emitting plate 12 to prevent damage caused by friction between the first light-emitting plate 11 and the second light-emitting plate 12.

[0039] The following further describes in detail a novel collimating backlight module and a display of the present invention in conjunction with specific embodiments and drawings.

[0040] Specifically, please refer to Figure 1 , an embodiment of the present invention provides a novel collimating backlight module, which at least includes a first backlight layer 1; the first backlight layer 1 at least includes a first light-emitting plate 11 and a second light-emitting plate 12; light-emitting structures are respectively arranged on the upper and lower surfaces of the first light-emitting plate 11 to concentrate the angle of the emitted light in the normal direction of the first light-emitting plate on the first cross-section, and deviate the emitted light from the normal direction of the first light-emitting plate by a first preset angle range on the second cross-section; the emitted light is deflected to the normal direction of the first light-emitting plate through the refraction of the second light-emitting plate 12; the first light-emitting plate 11 and the second light-emitting plate 12 cooperate with each other to make the external incident light emit within a second preset angle range.

[0041] In a possible implementation manner, the first light-emitting plate 11 and the second light-emitting plate 12 in the first backlight layer 1 are respectively a light guide plate and an inverse prism.

[0042] Light-emitting structures are arranged on both the upper and lower surfaces of the light guide plate as dot patterns to achieve light guiding in a specific direction. The light-emitting structure is a criss-cross V-cut structure, so that the emitted light is concentrated in the normal direction of the light guide plate on the first cross-section, and the emitted light is deviated from the normal direction of the light guide plate by 65° - 85° on the second cross-section, and then the emitted light is deflected to the normal direction of the light guide plate through the refraction of the inverse prism.

[0043] The cooperation between the first light-emitting plate and the second light-emitting plate realizes collimated light output. At this time, the external incident light emits within the range of -10° to 10°.

[0044] Define the normal direction of the first light-emitting plate 11 as the Z direction, and the plane perpendicular to the Z direction as the X-Y plane. The directions of any two mutually perpendicular lines on the X-Y plane are respectively defined as the X direction and the Y direction.

[0045] It should be noted that the Y-Z plane in the coordinate system is the first cross-section mentioned above, and the X-Z plane is the second cross-section.

[0046] The novel collimating backlight module further includes a second backlight layer 2, a reflective film 3 and a light source 4; the reflective film 3, the first light-emitting plate 11, the second light-emitting plate 12 and the second backlight layer 2 are stacked in sequence from bottom to top; the light source is arranged on one side of the first light-emitting plate.

[0047] In a possible implementation, the light source 4 is selected as an LED light bar, and the LED light bar is powered by low voltage DC12V or DC24V, with very high safety. The normal service life is up to more than 30,000 hours, and it can work normally at an ambient temperature of -30°C to +60°C, and different colors can be selected according to different lighting environments. The length of the LED light bar is equal to the length of the first light-emitting plate 11 in the X direction.

[0048] The first light-emitting plate 11 is equivalent to a light guide plate. Both the front and back sides of the light guide plate use a V-cut structure. On the X-Z plane, the angles of most of the emitted light are concentrated in the normal direction of the light guide plate. On the Y-Z plane, the angles of most of the emitted light are concentrated at 65° to 85° away from the normal direction of the light guide plate, and then the emitted light is deflected to the normal direction of the light guide plate through the refraction of the second light-emitting plate 12, so as to achieve the effect of collimated light output.

[0049] It should be noted that the second light-emitting plate 12 is an inverse prism. The emitted light deviating from the normal direction by 65° to 85° is deflected to -10° to 10° through the principles of refraction and total internal reflection by the inverse prism, and at this time, collimated light output is achieved.

[0050] Among them, the first light-emitting plate 11 is surrounded by a first light-emitting surface 13, a second light-emitting surface 14, a light-incident surface 15 facing the light source 4, a first side surface 16 and a second side surface 17.

[0051] The first light-emitting surface 13 is a reflective surface, and the second light-emitting surface 14 is a light-emitting surface.

[0052] The reflective surface is arranged on the side of the light guide plate facing the reflective film 3. Please refer to Figure 2 , the V-cut structure of the reflective surface is a plurality of first light-emitting strips 131 arranged in sequence. The first light-emitting strips 131 extend in the X direction, and the cross-section of the first light-emitting strips 131 in the Y-Z plane is arc-shaped.

[0053] A plurality of second light-emitting strips 132 arranged in sequence in the X direction are provided between adjacent first light-emitting strips 131, and the second light-emitting strips 132 are in a frustum of a pyramid structure.

[0054] The side view of the second light-emitting strip 132 is a trapezoid with the hypotenuse facing upward; and the length of the left base side of the trapezoid in this side view is greater than the length of the right base side.

[0055] For the second light-emitting strip 132, the bottom end A1 of any frustum of a pyramid structure A is connected to the bottom end B1 of another frustum of a pyramid structure B adjacent in the X direction, the bottom end A1 is smaller than the bottom end B1 by a preset size, and in the Z direction, the bottom end B1 is higher than the bottom end A1 by a preset height.

[0056] The light-emitting surface is provided on the side of the light guide plate facing away from the reflection film 3. Please refer to Figure 3 ., a plurality of third light-emitting strips 141 arranged in sequence are provided on the V-cut structure of the light-emitting surface, the third light-emitting strips 141 extend in the Y direction, and the cross-section of the third light-emitting strips 141 in the X-Z plane is a first rounded triangle 244.

[0057] Fourth light-emitting strips 142 are provided between 4 of the third light-emitting strips 141, the fourth light-emitting strips 142 extend in the Y direction, and the cross-section of the fourth light-emitting strips 142 in the X-Z plane is a second rounded triangle 145.

[0058] Please refer to Figure 4 ., the height L1 of the first rounded triangle 144 is less than the height L2 of the second rounded triangle 145.

[0059] A plurality of fifth light-emitting strips 143 arranged in sequence in the Y direction are provided between adjacent third light-emitting strips 141 and between the third light-emitting strips 141 and the fourth light-emitting strips 142, and the fifth light-emitting strips 143 are in a frustum of a pyramid structure.

[0060] The side view of the fifth light-emitting strip 143 is a trapezoid with the hypotenuse facing upward; and the length of the left base side of the trapezoid in this side view is less than the length of the right base side.

[0061] For the fifth light-emitting strip 143, the bottom end C1 of any frustum of a pyramid structure C is connected to the bottom end D1 of another frustum of a pyramid structure D adjacent in the X direction, the bottom end C1 is greater than the bottom end D1 by a preset size, and in the Z direction, the bottom end D1 is higher than the bottom end C1 by a preset height.

[0062] An inverse prism is provided on the light-emitting surface, and the side with the microstructure 121 of the inverse prism faces the light-emitting surface; the microstructures 121 are arranged in sequence and extend in the X direction, and the cross-section of the microstructures 121 in the Y-Z plane is an isosceles triangle.

[0063] In addition, a protective film 5 may be provided between the light guide plate and the reverse prism. The microstructure of the reverse prism is relatively sharp. The provision of the protective film 5 can, to a certain extent, avoid damage to the film layer caused by friction between the light guide plate and the reverse prism, so as to prevent the influence on the light output effect.

[0064] The second backlight layer 2 includes a first brightness enhancement plate 21 and a second brightness enhancement plate 22. The second backlight layer 2 is defined as a brightness enhancement film, the first brightness enhancement plate 21 is defined as a lower brightness enhancement film, and the second brightness enhancement plate 22 is defined as an upper brightness enhancement film, which are respectively used to broaden the light output angles in the Y direction and the X direction.

[0065] The lower brightness enhancement film and the reverse prism are overlapped with each other. The lower brightness enhancement film is provided with a plurality of first brightness enhancement strips 211 on the side facing away from the reverse prism. The first brightness enhancement strips 211 extend in the X direction, and the cross-section of the first brightness enhancement strips 211 in the Y-Z plane is arc-shaped.

[0066] The upper brightness enhancement film and the lower brightness enhancement film are overlapped with each other. The upper brightness enhancement film is provided with a plurality of second brightness enhancement strips 221 on the side facing away from the lower brightness enhancement film. The second brightness enhancement strips 221 extend in the Y direction, and the cross-section of the second brightness enhancement strips 221 in the X-Z plane is arc-shaped.

[0067] It should be noted that the brightness enhancement film is used to improve the light emission efficiency of the entire backlight module; the brightness enhancement film mainly includes four types, namely, a general prism sheet, a multi-functional prism sheet, a lenticular prism film, and a reflective polarizer.

[0068] In a possible implementation manner, both the upper brightness enhancement film and the lower brightness enhancement film are selected as lenticular prism films, so that the outgoing light is directly refracted at the microstructure, thereby realizing the focusing of light and improving the light emission efficiency. The microstructure on the lenticular prism film has an arc-shaped cross-section in the X-Z plane. The arc can be considered as the inscribed circle of a prism with a vertex angle of 132° - 152°. The length of the chord formed by connecting the two endpoints of the arc is less than or equal to 0.1 mm; please refer to Figure 5 , the vertex angle is preferably 142°. At this time, the length of the chord is 0.05 mm. According to the actual process capabilities, the length of the chord can be slightly relaxed and is not limited only to this;

[0069] A frame structure member 6 is provided to semi-surround the reflective film 3, the light guide plate, the reverse prism, the lower brightness enhancement film, and the upper brightness enhancement film. The frame structure member 6 covers both ends of the upper brightness enhancement film with a preset size.

[0070] In a possible implementation manner, the frame structure member 6 is selected as an aluminum frame, but it is not limited only to this material. Those skilled in the art can select a suitable frame material according to the actual situation.

[0071] Please refer to Figure 6, the light emitted by the LED light bar is refracted at an angle a to the light guide plate through the reflection film, and then the light is deflected to the normal direction of the light guide plate through the refraction of the inverse prism, thereby realizing collimated light output, and the viewing angle brightness is improved by the lower brightness enhancement film and the upper brightness enhancement film.

[0072] To further illustrate the effectiveness of the above brightness enhancement film, simulation calculations were carried out on the brightness enhancement film described in the present invention, and data such as the viewing angle brightness ratio before and after adding the brightness enhancement film were obtained respectively.

[0073] As Figure 7 shown, the viewing angle brightness ratio without adding the brightness enhancement film is given. At this time, the viewing angle brightness ratio can only be improved within the range of -10° to 10° in both the X direction and the Y direction.

[0074] As Figure 8 shown, the viewing angle brightness ratio after adding the brightness enhancement film is given. It can be seen that within the range of -30° to 30°, the viewing angle brightness ratio has a large improvement in both the X direction and the Y direction.

[0075] It should be noted that the embodiments of the present invention only define the shapes and approximate dimensions of the microstructures on each film layer, and the thickness, length, and width of the reflection film 3, the first light output plate 11, the second light output plate 12, the protective film 5, the first brightness enhancement plate 21, and the second brightness enhancement plate 22 are not limited.

[0076] Based on the same inventive concept, the embodiments of the present invention also provide a display, which is a kind of liquid crystal display, and the display at least includes the novel collimated backlight module.

[0077] In summary, the present invention provides a novel collimated backlight module and a display; by setting the microstructures of the first backlight layer and the second backlight layer, it is realized that external incident light can be emitted within an angular range; in the application of the present invention, the brightness has no large fluctuation within a 20° viewing angle, the brightness decays significantly within a 20° to 30° viewing angle, and almost complete anti-peeping is achieved outside a 30° viewing angle; and the overall brightness of the backlight module is also greatly improved.

[0078] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present invention thereto. Those of ordinary skill in the art can make various changes and modifications therein without departing from the scope and spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as claimed in the appended claims.

[0079] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0080] Although the description of the present invention is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and variations based on the above content. Therefore, all such substitutions, improvements and variations are included within the spirit and scope of the appended claims.

Claims

1. A novel collimating backlight module, characterized in that, It includes at least a first backlight layer (1); the first backlight layer (1) includes at least a first light-emitting plate (11) and a second light-emitting plate (12); the upper and lower surfaces of the first light-emitting plate (11) are respectively provided with light-emitting structures to concentrate the angle of the emitted light in the normal direction of the first light-emitting plate (11) on the first cross-section, and to deviate the emitted light from the normal direction of the first light-emitting plate (11) within a first preset angle range on the second cross-section; the emitted light is deflected to the normal direction of the first light-emitting plate (11) through the refraction of the second light-emitting plate (12); the first light-emitting plate (11) and the second light-emitting plate (12) cooperate with each other to emit external incident light within a second preset angle range; Wherein, the first light-emitting plate (11) is surrounded by a first light-emitting surface (13), a second light-emitting surface (14), a light-incident surface (15) facing the light source (4), a first side surface (16) and a second side surface (17); A plurality of first light-emitting strips (131) arranged in sequence are provided on the first light-emitting surface (13), the first light-emitting strips (131) extend from the first side surface (16) to the second side surface (17), and the first cross-section of the first light-emitting strips (131) is arc-shaped; A plurality of second light-emitting strips (132) arranged in sequence in the extending direction of the first light-emitting strips (131) are provided between adjacent first light-emitting strips (131), the second light-emitting strips (132) are frustum-of-a-square-pyramid structures, and the second cross-section of the second light-emitting strips (132) is a trapezoid with an upward-sloping hypotenuse; A plurality of third light-emitting strips (141) arranged in sequence are provided on the second light-emitting surface (14), the extending direction of the third light-emitting strips (141) is perpendicular to the extending direction of the first light-emitting strips (131), and the second cross-section of the third light-emitting strips (141) is a first rounded triangle (144); A fourth light-emitting strip (142) is provided between a preset number of the third light-emitting strips (141); the extending direction of the fourth light-emitting strip (142) is the same as the extending direction of the third light-emitting strips (141), and the second cross-section of the fourth light-emitting strip (142) is a second rounded triangle (145); A plurality of fifth light-emitting strips (143) arranged in sequence in the extending direction of the third light-emitting strips (141) are provided between adjacent third light-emitting strips (141) and between the third light-emitting strips (141) and the fourth light-emitting strip (142), the fifth light-emitting strips (143) are frustum-of-a-square-pyramid structures, and the first cross-section of the fifth light-emitting strips (143) is a trapezoid with an upward-sloping hypotenuse; The side of the second light-emitting plate (12) with the microstructures (121) faces the second light-emitting surface (14); the microstructures (121) are arranged in sequence and extend in the extending direction of the first light-emitting strips (131), and the first cross-section of the microstructures (121) is an isosceles triangle; Wherein, the height L1 of the first rounded triangle (144) is less than the height L2 of the second rounded triangle (145).

2. The novel collimating backlight module according to claim 1, wherein It further includes a second backlight layer (2), a reflective film (3), and a light source (4); The reflective film (3), the first light-emitting plate (11), the second light-emitting plate (12), and the second backlight layer (2) are laminated in sequence from bottom to top; The light source (4) is disposed on one side of the first light-emitting plate (11).

3. The novel collimating backlight module according to claim 2, wherein The first light-emitting surface (13) is disposed on the side of the first light-emitting plate (11) facing the reflective film (3); The second light-emitting surface (14) is disposed on the side of the first light-emitting plate (11) facing away from the reflective film (3).

4. The novel collimating backlight module according to claim 3, wherein, The second backlight layer (2) includes a first brightness enhancement plate (21) and a second brightness enhancement plate (22), which are used to expand the viewing angle in the second cross-sectional direction and the first cross-sectional direction; The first brightness enhancement plate (21) is laminated with the second light-emitting plate (12). A plurality of first brightness enhancement strips (211) are disposed on the side of the first brightness enhancement plate (21) facing away from the second light-emitting plate (12). The first brightness enhancement strips (211) extend in the extending direction of the first light-emitting strips (131), and the first cross-section of the first brightness enhancement strips (211) is arc-shaped; The second brightness enhancement plate (22) is laminated with the first brightness enhancement plate (21). A plurality of second brightness enhancement strips (221) are disposed on the side of the second brightness enhancement plate (22) facing away from the first brightness enhancement plate (21). The second brightness enhancement strips (221) extend in the extending direction of the third light-emitting strips (141), and the second cross-section of the second brightness enhancement strips (221) is arc-shaped.

5. The novel collimating backlight module according to claim 4, wherein A protective film (5) may be disposed between the first light-emitting plate (11) and the second light-emitting plate (12).

6. The novel collimating backlight module according to claim 5, characterized in that, A frame structure member (6) is provided to semi-surround the reflective film (3), the first light-emitting plate (11), the second light-emitting plate (12), the first brightness enhancement plate (21), and the second brightness enhancement plate (22). The frame structure member (6) covers both ends of the second brightness enhancement plate (22) with a preset size.

7. A display, which is a type of liquid crystal display, characterized in that, The display at least includes the novel collimating backlight module according to any one of claims 1-6.

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