Cutter, backlight module, light guide plate and preparation method thereof

Abstract

The present application relates to a kind of cutter, backlight module, light guide plate and its preparation method, the cutter includes blade, and the installation surface for being oppositely arranged with blade and being used to be installed with impact equipment interface, and the first connecting surface and the second connecting surface of connecting blade and installation surface, first connecting surface and second connecting surface are oppositely arranged;First connecting surface is connected with second connecting surface by third connecting surface and fourth connecting surface respectively;Third connecting surface and fourth connecting surface are oppositely arranged;First connecting surface is the inclined plane inclined to the direction where second connecting surface is located;Second connecting surface is the inclined plane inclined to the direction where first connecting surface is located.The cutter is used to prepare inclined slope microstructure, can be prepared to obtain the light guide plate with high luminous efficiency and high overall brightness, the overall optical performance of the light guide plate can be improved by 5%-20%.

Description

Technical Field

[0001] This invention relates to a cutting tool, a backlight module, a light guide plate, and a method for manufacturing the same. Background Technology

[0002] A light guide plate transforms a line or point light source into a uniform surface light source. Specifically, it guides light in the desired direction to achieve the required brightness and uniformity, resulting in a high-quality display. The light guide plate utilizes optical-grade acrylic / PC sheets, with light guide points fabricated on the acrylic / PC sheet using techniques such as laser engraving, V-shaped cross-grid engraving, and UV screen printing. The optical-grade acrylic sheet absorbs light emitted from the lamp and allows it to rest on its surface. When the light reaches each light guide point, the reflected light diffuses in various angles, breaking the reflection condition and exiting from the front of the light guide plate. By using light guide points of varying density and size, the light guide plate can achieve uniform light emission.

[0003] Light guide plates are mostly manufactured using laser engraving technology. The mold obtained by laser dotting forms a grid of circular or other regular shapes on the light guide plate to diffuse the light. However, light guide plates with such patterns have isotropic emitted light and divergent emitted light angles. When in use, the screen brightness is not high and the luminous efficiency is low. Summary of the Invention

[0004] The purpose of this invention is to provide a cutting tool that can produce a light guide plate and a backlight module with high luminous efficiency and high overall brightness, and a method for preparing the light guide plate using the cutting tool.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cutting tool for fabricating high-brightness microstructures on a light guide plate, comprising: a cutting edge, a mounting surface, and a first connecting surface and a second connecting surface connecting the cutting edge and the mounting surface, wherein the mounting surface and the cutting edge are disposed opposite to each other for docking and mounting with an impact device; the first connecting surface and the second connecting surface are disposed opposite to each other; the first connecting surface is connected to the second connecting surface via a third connecting surface and a fourth connecting surface; the third connecting surface and the fourth connecting surface are disposed opposite to each other; the first connecting surface is an inclined surface oriented toward the direction of the second connecting surface; the second connecting surface is an inclined surface oriented toward the direction of the first connecting surface.

[0006] Furthermore, the included angle between the first connecting surface and the mounting surface is 40°-80°; the included angle between the second connecting surface and the mounting surface is 10°-40°.

[0007] Furthermore, the length of the blade is 30-200 μm.

[0008] Furthermore, a first chamfer is formed between the third connecting surface and the second connecting surface; a second chamfer is formed between the fourth connecting surface and the second connecting surface, wherein the width of the first chamfer is 3-5 μm; and the width of the second chamfer is 3-5 μm.

[0009] Furthermore, the mounting surface has a rectangular structure, and the included angle between the third connecting surface and the fourth connecting surface is 10°-40°.

[0010] Furthermore, the material of the cutting tool is diamond.

[0011] The present invention also provides a method for preparing a light guide plate, the method comprising:

[0012] a) Provide an impact device and a cutting tool, and mount the cutting tool on the impact device, wherein the cutting tool is the cutting tool as described above;

[0013] b) Provide a substrate; move the cutting tool relative to the substrate to form a plurality of first microstructures on the substrate to obtain a master mold, called a female mold; make a copy of the master mold to obtain a male mold, i.e. a mold core, which is opposite to the master mold, and the mold core has a plurality of second microstructures.

[0014] c) Provide a substrate; press the mold core onto the substrate to form regions having a plurality of microstructures on the substrate;

[0015] d) Demolding to obtain the prepared light guide plate.

[0016] Furthermore, the high-brightness microstructure is identical to the first microstructure.

[0017] The present invention also provides a light guide plate, which is formed by the light guide plate preparation method described above, and includes a body and a plurality of high-brightness microstructures formed on the surface of the body.

[0018] The present invention also provides a backlight module, including the light guide plate as described above.

[0019] The beneficial effects of the present invention are as follows: the cutting tool provided by the present invention is used to prepare light guide microstructures, and can prepare light guide plates with high luminous efficiency and high overall brightness, and the overall brightness of the light guide plate can be improved by 5%-20%.

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the tool structure shown in the first embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the tool from another direction;

[0023] Figure 3 for Figure 1 A schematic diagram of the tool's structure in the second direction shown;

[0024] Figure 4 for Figure 1 A schematic diagram of the third-direction structure of the cutting tool shown;

[0025] Figure 5 This is a schematic diagram of the tool structure shown in the second embodiment of the present invention;

[0026] Figure 6 for Figure 5 A schematic diagram of the tool from another direction;

[0027] Figure 7 for Figure 5 A schematic diagram of the tool's structure in the second direction shown;

[0028] Figure 8 for Figure 5 A schematic diagram of the third-direction structure of the cutting tool shown;

[0029] Figure 9 This is a schematic diagram of the tool structure shown in the third embodiment of the present invention;

[0030] Figure 10 for Figure 9 A schematic diagram of the tool from another direction;

[0031] Figure 11 for Figure 9 A schematic diagram of the tool's structure in the second direction shown;

[0032] Figure 12 for Figure 9 A schematic diagram of the third-direction structure of the cutting tool shown;

[0033] Figure 13 This is a schematic diagram of the tool structure shown in the fourth embodiment of the present invention;

[0034] Figure 14 for Figure 13 A schematic diagram of the tool from another direction;

[0035] Figure 15 for Figure 13 A schematic diagram of the tool's structure in the second direction shown;

[0036] Figure 16 This is a schematic diagram of the tool structure shown in the fifth embodiment of the present invention;

[0037] Figure 17 for Figure 16 A schematic diagram of the tool from another direction;

[0038] Figure 18 for Figure 16 A schematic diagram of the tool's structure in the second direction shown;

[0039] Figure 19 This is a schematic diagram of the tool structure shown in the sixth embodiment of the present invention;

[0040] Figure 20 for Figure 19 A schematic diagram of the tool from another direction;

[0041] Figure 21 for Figure 19 A schematic diagram of the tool's structure in the second direction shown;

[0042] Figure 22 This is a schematic diagram of the light guide plate obtained by preparing the cutting tool according to the second embodiment of the present invention;

[0043] Figure 23 for Figure 22 A cross-sectional view of a portion of the structure of the light guide plate shown;

[0044] Figure 24 for Figure 22 A cross-sectional view of another part of the structure of the light guide plate shown;

[0045] Figure 25 for Figure 22 A schematic diagram of the high-brightness microstructure of the light guide plate shown;

[0046] Figure 26 This is a schematic diagram of the high-brightness microstructure of the light guide plate obtained by preparing the tool according to the third embodiment of the present invention;

[0047] Figure 27 This is a schematic diagram of the light guide plate obtained by preparing the cutting tool according to the fifth embodiment of the present invention;

[0048] Figure 28 for Figure 27 A cross-sectional view of a portion of the structure of the light guide plate shown;

[0049] Figure 29 for Figure 27 A cross-sectional view of another part of the structure of the light guide plate shown;

[0050] Figure 30 for Figure 27 A schematic diagram of the high-brightness microstructure of the light guide plate shown;

[0051] Figure 31 This is a schematic diagram of the high-brightness microstructure of the light guide plate prepared by the cutting tool shown in the sixth embodiment of the present invention. Detailed Implementation

[0052] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Please see Figures 1 to 4 The cutting tool 1 shown in the first embodiment of this application is used to prepare light-guiding microstructures on a light guide plate. Specifically, it is used to impact and prepare microstructures such as pits on a substrate. It includes a cutting edge 11, a mounting surface 12 opposite to the cutting edge 11, and a first connecting surface 13 and a second connecting surface 14 connecting the cutting edge 11 and the mounting surface 12.

[0055] The mounting surface 12 is used to dock with the impact device, and the blade 11 is used to contact the substrate first to impact and create a pit on the substrate. Obviously, the structure of the pit is the same as the structure of the blade 1.

[0056] The first connecting surface 13 and the second connecting surface 14 are arranged opposite to each other, and the first connecting surface 13 is connected to the second connecting surface 14 through the third connecting surface 15 and the fourth connecting surface 16 respectively. The third connecting surface 15 and the fourth connecting surface 16 are arranged opposite to each other.

[0057] Clearly, the blade 11 has a triangular prism-like structure. The mounting surface 12 has a quadrilateral structure, the first connecting surface 13 and the second connecting surface 14 are also quadrilateral structures, and the third connecting surface 15 and the fourth connecting surface 16 have triangular structures.

[0058] Please see Figure 3The first connecting surface 13 is an inclined surface oriented towards the direction of the second connecting surface 14, and the included angle between the first connecting surface 13 and the mounting surface 12 is 40°-80°. The second connecting surface 14 is an inclined surface oriented towards the direction of the first connecting surface 13, and the included angle between the second connecting surface 14 and the mounting surface 12 is 10°-40°. The specific included angles between the first connecting surface 13 and the mounting surface 12, and between the second connecting surface 14 and the mounting surface 12, can be set according to actual needs, thereby enabling the fabrication of a high-performance light guide plate.

[0059] Please see Figure 4 In this embodiment, the length a of the blade 11 is 30-200μm, and the specific length of the blade 11 is set according to the actual situation.

[0060] The included angle b between the third connecting surface 15 and the fourth connecting surface 16 is 10°-40°, that is, the length of the side of the mounting surface 12 that is parallel to the blade 11 is greater than the length of the blade 11.

[0061] Please see Figure 1 In this embodiment, the mounting surface 12 has a rectangular structure.

[0062] The preferred material for cutting tool 1 is diamond, but it is not limited to this. Other materials can also be used for cutting tool 1, which will not be listed here.

[0063] Please see Figures 5 to 8 The tool 2 shown in the second embodiment of this application is basically the same as the tool 1 shown in the first embodiment, except that: a first chamfer 27 is formed between the third connecting surface 25 and the second connecting surface 24, and the width of the first chamfer 27 is 3-5 μm. A second chamfer 28 is formed between the fourth connecting surface 26 and the second connecting surface 24, and the width of the second chamfer 28 is 3-5 μm. Both the first chamfer 27 and the second chamfer 28 are curved surfaces.

[0064] The arrangement of the first inverted surface 27 and the second inverted surface 28 makes the high-brightness microstructure of the prepared light guide plate conducive to the horizontal reflection of light, thus improving its performance.

[0065] Please see Figures 9 to 12 The tool 3 shown in the third embodiment of this application is basically the same as the tool 2 shown in the second embodiment, except that: the first chamfered surface 37 between the third connecting surface 35 and the second connecting surface 34 is a plane, and the second chamfered surface 38 formed between the fourth connecting surface 36 and the second connecting surface 34 is a plane. The arrangement of the first chamfered surface 37 and the second chamfered surface 38 makes the high-brightness microstructure of the prepared light guide plate conducive to the horizontal reflection of light, thereby improving performance.

[0066] Please see Figures 13 to 15The cutting tool 4 shown in the fourth embodiment of this application is basically the same as the cutting tool 1 shown in the first embodiment. The cutting edge 41 and the mounting surface 42 are arranged opposite to each other. The difference is that the mounting surface 42 has a trapezoidal structure and has a first waist edge 421 connected to the third connecting surface 45 and a second waist edge 422 connected to the fourth connecting surface 16. The included angle between the first waist edge 421 and the second waist edge 422 is 0°-60°. The specific included angle between the first waist edge 421 and the second waist edge 422 can be set according to actual needs.

[0067] Please see Figures 16 to 18 The cutting tool 5 shown in the fifth embodiment of this application is basically the same as the cutting tool 4 shown in the fourth embodiment, except that: a first chamfer 57 is formed between the third connecting surface 55 and the second connecting surface 54, and the width of the first chamfer 57 is 3-5 μm. A second chamfer 58 is formed between the fourth connecting surface 56 and the second connecting surface 54, and the width of the second chamfer 58 is 3-5 μm. Both the first chamfer 57 and the second chamfer 58 are planar.

[0068] The arrangement of the first inverted surface 57 and the second inverted surface 58 makes the high-brightness microstructure of the prepared light guide plate conducive to the horizontal reflection of light, thus improving its performance.

[0069] Please see Figures 19 to 21 The tool 6 shown in the sixth embodiment of this application is basically the same as the tool 5 shown in the fifth embodiment, except that the first chamfered surface 67 and the second chamfered surface 68 are both curved surfaces. The setting of the first chamfered surface 67 and the second chamfered surface 68 makes the high-brightness microstructure of the light guide plate obtained by the application beneficial to the horizontal reflection of light, thereby improving performance.

[0070] This invention also provides a method for preparing a light guide plate, the method comprising:

[0071] a) Provide an impact device and a cutting tool, and mount the cutting tool on the impact device, wherein the cutting tool is the cutting tool shown above;

[0072] b) Provide a substrate; move the cutting tool relative to the substrate to form several first microstructures on the substrate to obtain a master mold, called a female mold; make a copy of the master mold to obtain a male mold, i.e., a mold core, which is opposite to the master mold and has several second microstructures.

[0073] c) Provide a substrate; press a mold core onto the substrate to form regions with several microstructures on the substrate;

[0074] d) Demolding to obtain the prepared light guide plate.

[0075] In this embodiment, the first microstructure is obtained based on the cutting tool. The first microstructure is a pit formed on the substrate. The shape of the first microstructure is the same as that of the cutting tool. The specific shape of the first microstructure depends on the structure of the cutting tool used.

[0076] Several first microstructures are arranged in an array, and the specific arrangement depends on the structure of the light guide plate required.

[0077] In step a), the mounting surface of the tool is mounted on the impact device, with the cutting edge facing the substrate.

[0078] In step b), the substrate is made of metal, such as steel plate, chromium plate or nickel plate, etc., without specific limitations.

[0079] In step b), a master template with several first microstructures is prepared using a mechanical impact method. Specifically, a region is first selected, a starting coordinate is determined, and a tool is used to impact the substrate to form the first microstructures on the substrate; then the substrate is moved horizontally to the next coordinate according to the arrangement.

[0080] In actual operation, the relative movement between the cutting tool and the substrate includes the relative movement of the cutting tool in the horizontal direction and the vertical movement of the cutting tool in the vertical direction. During the vertical movement, the cutting tool impacts the substrate, thereby cutting out the first microstructure on the substrate, and then moves horizontally to the next position where the first microstructure needs to be formed.

[0081] The master mold is made by electroforming to produce a male mold that is the opposite of the master mold.

[0082] Because the master mold has several first microstructures, which are pits arranged in an array, the second microstructure of the light guide plate mold core is a protrusion. The high-brightness microstructure on the light guide plate made using this type of light guide plate mold core is the same as the first microstructure. Unlike the current circular or other regular patterned dot structures, this can increase the number of rays reflected after being irradiated onto its surface and emitted perpendicularly to the horizontal plane.

[0083] In step c): the raw material is cut and polished according to the required size of the light guide plate to obtain the substrate, and then the substrate is cleaned.

[0084] In step c), the light guide plate mold core is imprinted onto the substrate using a hot-pressing method. Specifically, this includes an electromagnetic module for heating the light guide plate mold core. First, the light guide plate mold core is brought into contact with the substrate. Because the light guide plate mold core has several second microstructures, a gap exists between it and the substrate. The sides of the contact surface between the light guide plate mold core and the substrate are sealed. Before imprinting, the air in the gap is extracted, thus creating a vacuum state between the light guide plate mold core and the substrate. This helps to prevent air bubbles from being generated during subsequent hot-pressing of the substrate, resulting in a smooth, high-gloss microstructure.

[0085] Then, the light guide plate mold core is instantly heated by the electromagnetic module to 160-250℃, so that the surface of the substrate is in a similar molten state. Then, the light guide plate mold core is pressed onto the substrate. Next, the light guide plate mold core is instantly cooled to room temperature of 20℃, so that the surface of the substrate solidifies from the molten state.

[0086] The method for preparing high-brightness microstructures using embossing technology is existing technology and will not be elaborated here.

[0087] In addition, the master mold can be reused multiple times. When preparing a light guide plate of the same size next time, it is only necessary to use the master mold to make a new sub-mold core using precision electroforming. There is no need to process and adjust the first microstructure to prepare a new light guide plate mold core.

[0088] The present invention also provides a light guide plate, which is formed by the light guide plate preparation method shown above.

[0089] Please see Figures 22 to 25 The light guide plate 100 is prepared using the cutting tool shown in the second embodiment. The light guide plate 100 includes a body 101 and a plurality of high-brightness microstructures 102 formed on the surface of the body 101, wherein the high-brightness microstructures 102 are arranged in an array or randomly. Light enters from the side of the body 101 and exits on the surface opposite to the surface containing the high-brightness microstructures 102 (the light-emitting surface). The specific shape of the high-brightness microstructures 102 is the same as the specific shape of the cutting tool shown in Embodiment 2. The high-brightness microstructures 102 have two curved inverted surfaces, which facilitates the reflection of light in the horizontal direction and improves the performance of the light guide plate 100.

[0090] The high-brightness microstructure 102 is a recess formed by the inward indentation of the body 101. The recess is a triangular prism-like structure with two inverted surfaces. These two inverted surfaces are arc-shaped, which is beneficial for the reflection of light in the horizontal direction and improves the performance of the light guide plate 100.

[0091] The included angles and side lengths of the various surfaces of the recess are exactly the same as those of the tool shown in the second embodiment, and will not be repeated here.

[0092] The high-brightness microstructure 102 can increase the number of incident light rays that are deflected towards the light-emitting surface after passing through the high-brightness microstructure 102 and emitted perpendicularly. Experiments have verified that the light guide plate 100 with the high-brightness microstructure 102 has a brightness increase of 5%-20% compared to the light guide plate 100 with conventional dots.

[0093] Furthermore, to further improve the brightness uniformity of the light guide plate 100, several brightening microstructures 103 are provided on the body 101 of the light guide plate 100. These brightening structures are raised structures, specifically a central protrusion with recessed annular edges. The height of the brightening microstructures 103 is 2.5µm-4.0µm. These high-brightness microstructures 102 ensure that the brightness uniformity of the light guide plate 100 reaches a baseline value, while the brightening microstructures 103 further ensure that the brightness uniformity of the light guide plate 100 reaches a target value. The target value requires a brightness uniformity greater than the baseline value. This baseline value ranges from 70% to 85%, meaning the brightness uniformity of the light guide plate 100 reaches 70%-85%, and the target value is 105%-120% of the baseline value. The high-brightness microstructure 102 and the brightening microstructure 103 are configured together to enhance the light output efficiency of the light guide plate 100. The high-brightness microstructure 102 is used to provide brightness gain of the light guide plate 100, and the brightening microstructure 103 is used to eliminate top white defects on the surface of the light guide plate 100, eliminate hot spots at the light entrance, and adjust local optical trends.

[0094] The high-brightness microstructure 102 and the brightening microstructure 103 are formed on at least one surface of the body 101. In this embodiment, the high-brightness microstructure 102 and the brightening microstructure 103 are formed on the same surface. The high-brightness microstructure 102 and the brightening microstructure 103 may also be formed on different surfaces. In other embodiments, the high-brightness microstructure 102 may also be formed on the light-emitting surface.

[0095] Please see Figure 26 The high-brightness microstructure 102 of the light guide plate 100 is prepared using the tool shown in Example 3. This high-brightness microstructure 102 has two inverted planes, which facilitates the reflection of light in the horizontal direction and improves the performance of the light guide plate 100.

[0096] Please see Figures 27 to 30 The light guide plate 100 is prepared using the tool shown in Example 5. The specific shape of the high-brightness microstructure 102 is the same as that of the tool shown in Example 2. The high-brightness microstructure 102 has two curved inverted surfaces, which facilitates the reflection of light in the horizontal direction and improves the performance of the light guide plate 100.

[0097] Please see Figure 31 The high-brightness microstructure 102 of the light guide plate 100 is prepared using the tool shown in Example 6. This high-brightness microstructure 102 has two inverted planes, which facilitates the reflection of light in the horizontal direction and improves the performance of the light guide plate 100.

[0098] The present invention also provides a backlight module, specifically a side-lamp backlight module, comprising a substrate, a plurality of LEDs mounted on the substrate, a light guide plate, and a reflective film located between the substrate and the light guide plate for reflecting light. The light guide plate is as shown above.

[0099] The high-brightness microstructure of the light guide plate enables light to be emitted uniformly and efficiently from the light-emitting surface, achieving the required brightness and uniformity, and resulting in a high-quality display image.

[0100] Furthermore, since the brightening microstructure is a raised structure, the distance between the light guide plate and the reflective film is the height of the raised microstructure, i.e., 2.5um-4.0um.

[0101] If the distance between the light guide plate and the reflective film of the backlight module is less than 2.5um, when the user presses the LCD screen made of the backlight module, the light guide plate and the reflective film come into contact. Due to the short distance between the light guide plate and the reflective film, the attraction between the light guide plate and the reflective film is relatively strong. When the user releases the LCD screen, due to the existence of the attraction, the rebound force of the light guide plate is relatively small, and it takes a long time for the light guide plate and the reflective film to separate. As a result, a white dot at the touch point will be seen on the screen for a long time before it disappears.

[0102] In this embodiment, the distance between the light guide plate and the reflective film is greater than 2.5µm. When the user presses the LCD screen, the relatively long distance between the light guide plate and the reflective film causes the attractive force to decrease sharply. When the user releases the LCD screen, the rebound force of the light guide plate is much greater than the attractive force, allowing the light guide plate and the reflective film to separate immediately. This results in a white dot appearing on the screen at the point of contact disappearing after the user releases the LCD screen, without affecting the user experience or performance. In this embodiment, the brightness-enhancing microstructure protrusion height of the light guide plate is between 2.5µm and 4.0µm, providing good light guiding performance and anti-whitening properties.

[0103] In summary, the cutting tool provided by the present invention is used to prepare high-brightness microstructures and can prepare light guide plates with high luminous efficiency and high overall brightness, which can improve the overall brightness of the light guide plate by 5%-20%.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A cutting tool for fabricating high-brightness microstructures on a light guide plate, characterized in that, include: The device includes a blade, a mounting surface, and a first and a second connecting surface connecting the blade and the mounting surface. The mounting surface and the blade are arranged opposite to each other for docking with an impact device. The first and second connecting surfaces are arranged opposite to each other. The first connecting surface is connected to the second connecting surface via a third and a fourth connecting surface. The third and fourth connecting surfaces are arranged opposite to each other. The first connecting surface is an inclined surface oriented towards the direction of the second connecting surface. The second connecting surface is an inclined surface oriented towards the direction of the first connecting surface. A first chamfer is formed between the third connecting surface and the second connecting surface; a second chamfer is formed between the fourth connecting surface and the second connecting surface, wherein the width of the first chamfer is 3-5 μm; and the width of the second chamfer is 3-5 μm. The first and second inverted surfaces can be either curved or flat.

2. The cutting tool as described in claim 1, characterized in that, The included angle between the first connecting surface and the mounting surface is 40°-80°; the included angle between the second connecting surface and the mounting surface is 10°-40°.

3. The cutting tool as described in claim 1, characterized in that, The blade length is 30-200μm.

4. The cutting tool as described in claim 1, characterized in that, The mounting surface has a rectangular structure, and the included angle between the third connecting surface and the fourth connecting surface is 10°-40°.

5. The cutting tool as described in claim 1, characterized in that, The cutting tool is made of diamond.

6. A method for preparing a light guide plate, characterized in that, The preparation method includes: a) Providing an impact device and a cutting tool, wherein the cutting tool is mounted on the impact device, wherein the cutting tool is the cutting tool as described in any one of claims 1 to 5; b) Provide a substrate; move the cutting tool relative to the substrate to form a plurality of first microstructures on the substrate to obtain a master mold, called a female mold; make a copy of the master mold to obtain a male mold, i.e. a mold core, which is opposite to the master mold, and the mold core has a plurality of second microstructures. c) Provide a substrate; press the mold core onto the substrate to form regions having a plurality of microstructures on the substrate; d) Demold to obtain the prepared light guide plate.

7. The method for preparing the light guide plate as described in claim 6, characterized in that, The microstructure on the surface of the light guide plate is the same as the first microstructure.

8. A light guide plate, characterized in that, The light guide plate is formed by the method of preparing a light guide plate as described in any one of claims 6 to 7, and includes a body and a plurality of microstructures formed on the surface of the body.

9. A backlight module, characterized in that, Including the light guide plate as described in claim 8.

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