Double-sided light guide plate, processing method thereof and backlight module

Abstract

The invention discloses a double-sided light guide plate, a processing method thereof and a backlight module, and relates to the technical field of light guide plate processing, the double-sided light guide plate comprises a light guide plate body, the light guide plate body comprises a first surface and a second surface which are oppositely arranged, and the light guide plate body further comprises a light inlet surface and a light guide side surface which are arranged between the first surface and the second surface; each of the first surface and the second surface comprises a positioning surface and a light guide surface which are sequentially arranged away from the light inlet surface; positioning grooves are formed in the first positioning surface and the second positioning surface, the positioning grooves extend in the first direction parallel to the light inlet surface, at least parts of the positioning grooves are arc grooves, and scribed line structures which are arranged in a crossed mode are formed in the arc grooves; a reflecting coating is arranged between the first light guide surface and the second light guide surface and on the light guide side surface; the scheme that the positioning face and the light guide face are arranged in a partitioned mode is adopted, light with the large scattering angle is refracted outwards in the positioning face, and the technical effects of light spot restraining and uniformity improving are achieved in cooperation with the arrangement of the reflection coating.

Description

Technical Field

[0001] The present invention relates to the technical field of light guide plate processing, and in particular to a double-sided light guide plate and a processing method thereof, and a backlight module. Background Art

[0002] Light guide plates (LGPs) are key optical components in various display devices. Their function is to transform light from a linear light source into a uniform surface light source through total reflection and scattering, meeting the display device's requirements for brightness and uniformity. With the rapid development of double-sided display devices such as transparent advertising screens and double-sided electronic signage, traditional single-sided LGPs are no longer able to meet these demands.

[0003] Specifically, traditional single-sided light guide plates typically use a symmetrical light guide structure, such as symmetrical V-grooves or dot structures on both sides. When directly applied to double-sided light guide scenarios, the scattered light paths on the upper and lower surfaces overlap. After multiple total reflections of light within the plate, the light intensity distribution becomes unbalanced due to interference from the double-sided microstructure, resulting in rapid brightness decay in areas far from the light source and insufficient uniformity. If the dot structure density is increased to improve light uniformity, one of the following situations may occur: 1. Light incident at a large angle near the light source is scattered by dense dots, with some light escaping and forming a ring-shaped halo. 2. Double-sided dots overlap in the near-end area, causing the scattered light intensity to superimpose, forming an uncontrollable bright spot. It can be seen that when the existing light guide plate is used in a double-sided light guide scenario, there is insufficient light uniformity, or the near-end scattering of the light source is out of control to form light spots. A new light guide plate is urgently needed to solve the technical problems of double-sided display devices that are difficult to overcome simultaneously: insufficient light uniformity and easy formation of light spots. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-sided light guide plate and its processing method, and a backlight module to solve the problems of insufficient light uniformity and easy formation of light spots when the light guide plate in the prior art is used in double-sided display devices, which are difficult to overcome at the same time.

[0005] To achieve this object, the present invention adopts the following technical solutions: A double-sided light guide plate, comprising a light guide plate body, wherein the light guide plate body comprises a first surface and a second surface disposed opposite to each other, and further comprises a light-incoming surface and a light-guiding side surface disposed between the first surface and the second surface; The first surface includes a first positioning surface and a first light guiding surface sequentially arranged away from the light incident surface, and the second surface includes a second positioning surface and a second light guiding surface sequentially arranged away from the light incident surface; Both the first positioning surface and the second positioning surface are provided with positioning grooves, which extend along a first direction parallel to the light incident surface, and at least part of the positioning groove is an arc groove, and a cross-shaped engraved line structure is provided on the arc groove; between the first light guiding surface and the second light guiding surface, a reflective coating is provided on the light guiding side surface.

[0006] Optionally, along the second direction, the positioning groove on the first positioning surface is arranged to overlap with the positioning groove on the second positioning surface; Along the second direction, the scoreline structure on the first positioning surface does not overlap with the scoreline structure on the second positioning surface.

[0007] Optionally, the reflective coating comprises a titanium dioxide coating sprayed on the light-guiding side surface; and a light-absorbing film layer is attached to the junctions of the first light-guiding surface, the second light-guiding surface and the light-guiding side surface.

[0008] Optionally, a portion of the light guide plate body between the first positioning surface and the second positioning surface is a positioning portion, and a portion of the light guide plate body between the first light guide surface and the second light guide surface is a light guide portion; Along the second direction, the thickness of the light guiding portion is smaller than the thickness of the positioning portion, and the light guiding portion is located between the two positioning grooves.

[0009] Optionally, a positioning frame is sleeved on one side of the light guide plate body; a mounting groove is formed on the positioning frame at a position corresponding to the light guide plate body, a light-through groove is formed on the bottom wall of the mounting groove at a position corresponding to the light entrance surface, and an end portion of the light guide plate body provided with the light entrance surface is sleeved in the mounting groove; A positioning plate is extended from the positioning frame at a position corresponding to the positioning groove. The positioning plate is detachably connected to a movable baffle assembly. The movable baffle assembly at least partially covers the step surface between the positioning portion and the light guide portion.

[0010] Optionally, the light guide plate body is provided with a positioning plate on both sides along the first direction, and the positioning plate is provided with a snap-fitting groove corresponding to the two positioning grooves; A movable baffle assembly is respectively provided on both sides of the light guide plate body along the second direction, and the movable baffle assembly includes two clamping parts respectively provided at the positions of the two clamping grooves on the same side, and a movable baffle unit is connected between the two clamping parts, and the movable baffle unit is used to cover the step surface between the positioning part and the light guide part.

[0011] Optionally, the clamping groove is a circular groove with an opening, the clamping member is provided with an annular groove at a position corresponding to the clamping groove, the clamping member passes through the opening through the annular groove and is embedded in the clamping groove; the clamping member further has a protruding positioning post; The movable baffle unit is also connected to a mounting cylinder, the positioning column is threadedly connected to the inner wall of the mounting cylinder, and the movable baffle unit can be rotated in a direction away from or close to the step surface through the rotational connection between the annular groove and the clamping groove.

[0012] Optionally, the movable baffle unit includes a first plate connected to the mounting cylinder and a second plate connected to an end of the first plate, wherein the second plate is used to cover the step surface; the end of the clamping member away from the positioning frame is configured as a magnetic attraction portion; On one side of the light guide plate body along the second direction, the side of the magnetic attraction part of the clip close to the second plate body is the first magnetic pole; on the other side of the light guide plate body along the second direction, the side of the magnetic attraction part of the clip close to the second plate body is the second magnetic pole; the polarity of the first magnetic pole is opposite to that of the second magnetic pole.

[0013] A method for processing a double-sided light guide plate, for preparing the double-sided light guide plate as described above, comprising: Providing a light guide plate body, wherein a light guide surface of the light guide plate body is pre-formed with a micro light guide structure; Forming positioning grooves on both surfaces of the light guide plate body, and forming engraved line structures on the positioning grooves; After shielding the positioning portion of the light guide plate body, a reflective coating is sprayed on the light guide side surface of the light guide plate body.

[0014] A backlight module comprises the double-sided light guide plate as described above, wherein a light source is provided on one side of the light incident surface of the double-sided light guide plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The double-sided light guide plate, its processing method, and backlight module provided by the present invention can refract the light scattered to the positioning surface to the outside when the light source irradiates the light to the light guide plate body through the light input surface by setting a positioning groove with a partially arc groove on the positioning surface, thereby destroying the total reflection of the positioning surface and avoiding the occurrence of bright spots near the light source; then, the remaining light of the light source enters the area between the two light guide surfaces, forming a uniform bright surface on the two light guide surfaces, and with the setting of the reflective coating, the remaining light can be efficiently reflected and circulated in the plate body, thereby enhancing the illumination and uniformity of the light guide surface; in summary, the double-sided light guide plate, its processing method, and backlight module provided by the present invention adopt a scheme of partitioning the positioning surface and the light guide surface, so that light with a larger scattering angle is refracted outward in the positioning surface, and with the setting of the reflective coating, the technical effects of light spot suppression and improved uniformity are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0018] Figure 1 is a first structural schematic diagram of a light guide plate body in an embodiment of the present invention; Figure 2 is a second structural schematic diagram of the light guide plate body in an embodiment of the present invention; Figure 3 A schematic diagram of the overall structure of a double-sided light guide plate provided in an embodiment of the present invention; Figure 4 A schematic diagram of a first exploded structure of a double-sided light guide plate provided in an embodiment of the present invention; Figure 5 A schematic diagram of a second exploded structure of a double-sided light guide plate provided in an embodiment of the present invention; Illustrations: 100, light guide plate body; 110, positioning portion; 120, light guide portion; 101, first surface; 1011, first positioning surface; 1012, first light guide surface; 102, second surface; 1021, second positioning surface; 1022, second light guide surface; 103, light-incoming surface; 104, light-guiding side surface; 105, positioning groove; 106, line structure; 107, positioning side surface; 200, positioning frame; 201, mounting groove; 202, light-transmitting groove; 210, positioning plate; 211, snap-fit groove; 220, movable baffle assembly; 221, snap-fit part; 2211, annular groove; 2212, positioning column; 222, movable baffle unit; 2221, first plate body; 2222, second plate body; 223, mounting tube. DETAILED DESCRIPTION

[0019] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions 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. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] Example 1: The present invention provides a double-sided light guide plate (LGP) for various display devices, particularly transparent advertising screens and double-sided electronic signage. With the widespread adoption of these devices, traditional single-sided LGPs are no longer able to meet the requirements of modern display technology for brightness uniformity and spot control. Therefore, the LGP structure provided by this embodiment effectively addresses existing issues such as insufficient light uniformity and the formation of spots near the light source.

[0023] like Figure 1and Figure 2 As shown, the double-sided light guide plate in this embodiment includes a light guide plate body 100, the light guide plate body 100 includes a first surface 101 and a second surface 102 arranged opposite to each other, the light guide plate body 100 also includes a light-incoming surface 103 and a light-guiding side surface 104 arranged between the first surface 101 and the second surface 102; the first surface 101 includes a first positioning surface 1011 and a first light-guiding surface 1012 arranged in sequence away from the light-incoming surface 103, and the second surface 102 includes a first positioning surface 1011 and a first light-guiding surface 1012 arranged in sequence away from the light-incoming surface 103 is provided with a second positioning surface 1021 and a second light-guiding surface 1022 in sequence; a positioning groove 105 is provided on the first positioning surface 1011 and the second positioning surface 1021, and the positioning groove 105 is extended along a first direction parallel to the light-entering surface 103, and the positioning groove 105 is at least partially an arc groove, and a cross-shaped engraved structure 106 is provided on the arc groove; between the first light-guiding surface 1012 and the second light-guiding surface 1022, a reflective coating is provided on the light-guiding side surface 104. It should be supplemented that the first positioning surface 1011 in the first surface 101 is used to position the light-guiding plate body 100, and the first light-guiding surface 1012 is used to provide a uniform light field. Its surface can be provided with structures such as V-grooves and light-guiding bumps, so that the light can be diffused to various angles and then emitted from the light-guiding plate body 100 after destroying the reflection condition. The specific structure and principle of the light-guiding surface are well known to those skilled in the art and will not be elaborated in detail in this embodiment. Similarly, the second positioning surface 1021 and the second light guiding surface 1022 adopt the same configuration and are not described in detail.

[0024] For the double-sided light guide plate in this embodiment, by setting a positioning groove 105 in the form of a partially arc groove on the positioning surface, combined with the cross-line structure 106, when the light source irradiates light to the light guide plate body 100 through the light input surface 103, the light scattered to the positioning surface is refracted to the outside, thereby destroying the total reflection of the positioning surface and avoiding the appearance of bright spots near the light source; then, the remaining light of the light source enters the area between the two light guide surfaces, forming a uniform bright surface on the two light guide surfaces, and combined with the setting of the reflective coating, the remaining light can be efficiently reflected and circulated in the plate body, thereby enhancing the illumination and uniformity of the light guide surface; in summary, the double-sided light guide plate in this embodiment adopts a scheme of partitioning the positioning surface and the light guide surface, so that light with a larger scattering angle is refracted outward in the positioning surface, and combined with the setting of the reflective coating, the technical effects of light spot suppression and improved uniformity are achieved.

[0025] Furthermore, along the second direction, the positioning groove 105 on the first positioning surface 1011 is arranged to overlap with the positioning groove 105 on the second positioning surface 1021; along the second direction, the scribed line structure 106 on the first positioning surface 1011 does not overlap with the scribed line structure 106 on the second positioning surface 1021. It should be noted that the position, cross-sectional shape and other parameters of the positioning groove 105 can be determined based on the positional relationship between the double-sided light guide plate and the light source. By arranging the positioning grooves 105 at different positions on the positioning surface, a suitable position can be found so that when the light source irradiates light through the light-incoming surface 103 to the light guide plate body 100, the light scattered onto the positioning surface is refracted to the outside, thereby destroying the total internal reflection of the positioning surface and avoiding the occurrence of bright spots at positions where the light guide surface is close to the light source.

[0026] Specifically, when part of the light enters the light guide plate body 100 from the light inlet surface 103, it will be reflected and propagated within the light guide plate. The positioning groove 105 is provided with a line structure 106 on the positioning surface, so that the light will not be concentrated and reflected when it reaches the positioning groove 105, but will be dispersed in different directions, thereby avoiding the formation of a high-intensity reflection area on the positioning surface and reducing the occurrence of light spots and unevenness. The positioning groove 105 is provided before the light guide surface so that the light with a larger scattering angle can be guided out of the light guide plate through the positioning groove 105 before it reaches the light guide surface. In this way, the light has begun to disperse when passing through the positioning groove 105, so that the brightness of the light source can be more evenly transmitted to the light guide surface, avoiding the halo or bright spot phenomenon caused by excessive concentration of light. In addition, the upper and lower line structures 106 are arranged so that they do not overlap, ensuring that the direction and shape of the line structure 106 are different when the light passes through each surface, thereby avoiding light interference between the upper and lower surfaces, making the light propagation path more independent, avoiding unnecessary interference effects, and reducing the formation of light spots.

[0027] Furthermore, the reflective coating includes a titanium dioxide coating sprayed on the light-guiding side surface 104; and a light-absorbing film layer is attached to the junction of the first light-guiding surface 1012 and the second light-guiding surface 1022 with the light-guiding side surface 104. The titanium dioxide coating plays a role in reflecting internal light, thereby improving the brightness and uniformity of the light guide plate body 100, and the light-absorbing film layer includes but is not limited to carbon black, black aluminum oxide, titanium black and other materials that can absorb light. It can effectively absorb light after passing through the reflective coating, especially some light that does not conform to the predetermined light path, reducing the possibility of these light rays being reflected back into the light-guiding surface, so as to improve the backlight effect. This is not limited in this embodiment. In addition, the titanium dioxide coating can be replaced with aluminum powder, silver powder, etc., as long as it can reflect light, and this is not limited in this embodiment.

[0028] Furthermore, the portion of the light guide plate body 100 between the first positioning surface 1011 and the second positioning surface 1021 is the positioning portion 110, and the portion of the light guide plate body 100 between the first light guide surface 1012 and the second light guide surface 1022 is the light guide portion 120; the side of the positioning portion 110 is the positioning side surface 107, and no reflective coating is set on the positioning side surface 107 along the second direction. The thickness of the light guide portion 120 is less than the thickness of the positioning portion 110, and the light guide portion 120 is located between the two positioning grooves 105.

[0029] It should be noted that the thicker positioning portion 110 not only provides physical support and positional constraints, but also places the upper and lower positioning grooves 105 on either side of the light guide 120, which can reduce unnecessary light loss during reflection and scattering by the light guide 120, ultimately achieving more uniform light output. Furthermore, when high-angle light enters the light guide plate, it is prone to forming an annular halo or concentrated area near the proximal end. When the positioning grooves 105 and the light guide surface are not in the same plane, the high-angle light is effectively guided to the appropriate refraction path, avoiding this annular halo phenomenon and reducing non-uniformity near the proximal end of the light guide surface.

[0030] On the basis of the above embodiment, a positioning frame 200 is sleeved on one side of the light guide plate body 100; the positioning frame 200 is provided with a mounting groove 201 at a position corresponding to the light guide plate body 100, and the bottom wall of the mounting groove 201 is provided with a light-through groove 202 at a position corresponding to the light input surface 103, and the end of the light guide plate body 100 with the light input surface 103 is sleeved in the mounting groove 201; the positioning frame 200 is extended with a positioning plate 210 at a position corresponding to the positioning groove 105, and the positioning plate 210 is detachably connected to a movable baffle assembly 220, and the movable baffle assembly 220 at least partially covers the step surface between the positioning portion 110 and the light guide portion 120.

[0031] The positioning frame 200 provides stable mechanical support for the light guide plate body 100. The movable baffle assembly 220, when adjusted, covers the stepped surface, effectively preventing uneven light scattering and preventing light emitted from the positioning surface from affecting light emitted from the light guide surface. Furthermore, the detachable design of the positioning plate 210 and movable baffle assembly 220 provides greater flexibility and ease of maintenance for the double-sided light guide plate, further enhancing light efficiency and display stability.

[0032] Specifically, if Figures 3 to 5As shown, a positioning plate 210 is provided on both sides of the light guide plate body 100 along the first direction, and the positioning plate 210 is provided with a snap-in groove 211 corresponding to the two positioning grooves 105; a movable baffle assembly 220 is provided on both sides of the light guide plate body 100 along the second direction, and the movable baffle assembly 220 includes two snap-in parts 221 respectively provided at the positions corresponding to the two snap-in grooves 211 on the same side, and a movable baffle unit 222 is connected between the two snap-in parts 221, and the movable baffle unit 222 is used to cover the step surface between the positioning part 110 and the light guide part 120.

[0033] As an optional embodiment, the snap-in groove 211 is a circular groove with an opening, and the part of the circular groove at the opening should be elastic to facilitate the snap-in of the snap-in groove 211. The snap-in part 221 is provided with an annular groove 2211 at the position corresponding to the snap-in groove 211, and the snap-in part 221 passes through the opening through the annular groove 2211 and is embedded in the snap-in groove 211; the snap-in part 221 also has a protruding positioning column 2212; the movable baffle unit 222 is also connected to the mounting tube 223, and the positioning column 2212 is threadedly connected to the inner wall of the mounting tube 223. The movable baffle unit 222 is rotated in a direction away from or close to the step surface through the rotational connection between the annular groove 2211 and the snap-in groove 211.

[0034] The movable baffle unit 222 includes a first plate 2221 connected to the mounting cylinder 223 and a second plate 2222 connected to the end of the first plate 2221. The second plate 2222 is used to cover the step surface; or, The movable baffle unit 222 includes a first plate 2221 connected to the mounting cylinder 223 and a second plate 2222 connected to the end of the first plate 2221. The second plate 2222 is used to cover the stepped surface. The second plate 2222 is connected to a third plate (not shown) for covering the positioning side surface. It is understandable that the movable baffle unit 222 is threadedly connected to the positioning column 2212 to enable the movable baffle unit 222 in the movable baffle assembly 220 to be disassembled and replaced to match the following two scenarios: 1. Before spraying the reflective coating on the light-guiding side surface 104 of the light guide plate body 100, replace another movable baffle. This movable baffle differs from the movable baffle unit 222 in this embodiment in that a third plate is connected to its side, which can cover the positioning side surface. This prevents the reflective coating from adhering to the positioning side surface 107 when spraying the reflective coating, ensuring that the positioning side surface 107 is not provided with a reflective coating. This prevents the positioning side surface 107 from focusing light through reflection, thereby preventing the positioning side surface 107 from forming a bright spot at the edge of the light guide surface. 2. When the double-sided light guide plate is installed in the backlight module, the movable baffle unit 222 without the third plate body is replaced to reduce the width of the double-sided light guide plate, making it easier to meet the assembly requirements of the double-sided light guide plate; and the second plate body 2222 serves to separate the positioning surface and the light guide surface. When light with a larger scattering angle is refracted outward through the positioning groove 105, the first plate body 2221 and the second plate body 2222 effectively prevent the light at the positioning groove 105 from diffusing to above the light guide surface, thereby improving the display effect.

[0035] Furthermore, the movable baffle unit 222 includes a first plate 2221 connected to the mounting tube 223 and a second plate 2222 connected to the end of the first plate 2221. The second plate 2222 is used to cover the stepped surface. The end of the clip 221 away from the positioning frame 200 is configured as a magnetic portion. On one side of the light guide plate body 100 along the second direction, the magnetic portion of the clip 221 near the second plate 2222 serves as a first magnetic pole. On the other side of the light guide plate body 100 along the second direction, the magnetic portion of the clip 221 near the second plate 2222 serves as a second magnetic pole. The first magnetic pole and the second magnetic pole have opposite polarities. Thus, the polarity of the first and second magnetic poles are opposite, preventing the baffle assembly from loosening or shifting, and achieving automatic closing of the movable baffle unit 222. This simplifies the installation and adjustment process of the movable baffle assembly 220. Through the magnetic connection, workers can quickly and accurately place the movable baffle unit in a predetermined position.

[0036] Example 2: This embodiment further provides a method for processing a double-sided light guide plate, which is used to prepare the double-sided light guide plate in the first embodiment, comprising: S1. Provide a light guide plate body 100, wherein a light guide surface of the light guide plate body 100 is pre-formed with a micro light guide structure; S2. Forming positioning grooves 105 on both surfaces of the light guide plate body 100 and forming engraved line structures 106 on the positioning grooves 105; the specific processing method is not limited and includes but is not limited to CNC processing, laser processing, engraving, etc.; S3 , after shielding the positioning portion 110 of the light guide plate body 100 , spraying a reflective coating on the light guide side surface 104 of the light guide plate body 100 .

[0037] The process of shielding the positioning portion 110 of the light guide plate body 100 includes: S31. Select a movable baffle unit 222. The movable baffle unit 222 includes a first plate 2221 connected to the mounting tube 223 and a second plate 2222 connected to the end of the first plate 2221. The second plate 2222 is used to cover the step surface. The second plate 2222 is connected to a third plate (not shown). The third plate is used to cover the positioning side 107. S32. Install the clamping members 221 on both sides of the movable baffle unit 222 through threaded connection, and correspondingly snap the clamping members 221 into the clamping grooves 211; and under the action of the first magnetic pole and the second magnetic pole, the two movable baffle units 222 move closer to each other to cover the step surface and the positioning side surface 107; To install the movable baffle unit 222 on the positioning groove 105; S4. After spraying the reflective coating, replace another movable baffle unit 222; the other movable baffle unit 222 includes a first plate 2221 connected to the mounting tube 223 and a second plate 2222 connected to the end of the first plate 2221, and the second plate 2222 is used to cover the step surface; Among them, the configuration of steps S31 and S32 mainly covers the positioning side 107 by the third plate, which can effectively prevent the reflective coating from contaminating this area. In this way, when spraying the reflective coating, the positioning side 107 can be kept clean, avoiding direct coverage by the reflective coating, thereby preventing the positioning side 107 from causing unnecessary light spots or bright spots during the light propagation process, thereby ensuring the light output effect of the double-sided light guide plate. After the spraying is completed, another movable baffle unit 222 can be replaced to reduce the overall width of the double-sided light guide plate to meet the installation requirements of the backlight module. In conjunction with the installation structure of the first and second magnetic poles in this embodiment, the installation efficiency of the movable baffle unit 222 can be improved. In addition, the two types of movable baffle units 222 share a set of positioning structures, which not only ensures processing accuracy and installation accuracy, but also reduces the additional development investment of the positioning structure, and has the advantage of low cost. In summary, the processing method of the double-sided light guide plate not only meets the dimensional requirements of the double-sided light guide plate, but also ensures the light output effect of the double-sided light guide plate, while also having the advantages of high processing efficiency and high processing accuracy.

[0038] Example 3: This embodiment further provides a backlight module, including the double-sided light guide plate in the first embodiment, wherein a light source is provided on one side of the light incident surface 103 of the double-sided light guide plate.

[0039] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-sided light guide plate, characterized in that: The light guide plate body (100) comprises a first surface (101) and a second surface (102) arranged opposite to each other, and the light guide plate body (100) further comprises a light-incoming surface (103) and a light-guiding side surface (104) arranged between the first surface (101) and the second surface (102); The first surface (101) comprises a first positioning surface (1011) and a first light guiding surface (1012) which are sequentially arranged away from the light-entering surface (103); the second surface (102) comprises a second positioning surface (1021) and a second light guiding surface (1022) which are sequentially arranged away from the light-entering surface (103); The first positioning surface (1011) and the second positioning surface (1021) are both provided with positioning grooves (105), the positioning grooves (105) extending along a first direction parallel to the light-entering surface (103), and at least a portion of the positioning grooves (105) are arc grooves, and a cross-shaped engraved structure (106) is provided on the arc grooves; a reflective coating is provided on the light-guiding side surface (104) between the first light-guiding surface (1012) and the second light-guiding surface (1022).

2. The double-sided light guide plate according to claim 1, characterized in that: Along the second direction, the positioning groove (105) on the first positioning surface (1011) is arranged to overlap with the positioning groove (105) on the second positioning surface (1021); Along the second direction, the scribed line structure (106) on the first positioning surface (1011) and the scribed line structure (106) on the second positioning surface (1021) do not overlap.

3. The double-sided light guide plate according to claim 1, characterized in that: The reflective coating comprises a titanium dioxide coating sprayed on the light-guiding side surface (104); and a light-absorbing film layer is attached to the junction of the first light-guiding surface (1012), the second light-guiding surface (1022) and the light-guiding side surface (104).

4. The double-sided light guide plate according to claim 1, characterized in that: The portion of the light guide plate body (100) between the first positioning surface (1011) and the second positioning surface (1021) is a positioning portion (110), and the portion of the light guide plate body (100) between the first light guide surface (1012) and the second light guide surface (1022) is a light guide portion (120); Along the second direction, the thickness of the light-guiding portion (120) is smaller than the thickness of the positioning portion (110), and the light-guiding portion (120) is located between the two positioning grooves (105).

5. The double-sided light guide plate according to claim 4, characterized in that: A positioning frame (200) is sleeved on one side of the light guide plate body (100); a mounting groove (201) is provided on the positioning frame (200) at a position corresponding to the light guide plate body (100); a light-through groove (202) is provided on the bottom wall of the mounting groove (201) at a position corresponding to the light-incoming surface (103); and an end portion of the light guide plate body (100) provided with the light-incoming surface (103) is sleeved in the mounting groove (201); A positioning plate (210) is extended from the positioning frame (200) at a position corresponding to the positioning groove (105), and the positioning plate (210) is detachably connected to a movable baffle assembly (220), and the movable baffle assembly (220) at least partially covers the step surface between the positioning portion (110) and the light guide portion (120).

6. The double-sided light guide plate according to claim 5, characterized in that: The light guide plate body (100) is provided with a positioning plate (210) on both sides along the first direction, and the positioning plate (210) is provided with a snap-fitting groove (211) corresponding to the two positioning grooves (105); A movable baffle assembly (220) is respectively provided on both sides of the light guide plate body (100) along the second direction. The movable baffle assembly (220) includes two clamping members (221) respectively provided at positions corresponding to the two clamping grooves (211) on the same side. A movable baffle unit (222) is connected between the two clamping members (221). The movable baffle unit (222) is used to cover the step surface between the positioning portion (110) and the light guide portion (120).

7. The double-sided light guide plate according to claim 6, characterized in that: The clamping groove (211) is a circular groove with an opening, and the clamping member (221) is provided with an annular groove (2211) at a position corresponding to the clamping groove (211). The clamping member (221) passes through the opening via the annular groove (2211) and is embedded in the clamping groove (211). The clamping member (221) also has a protruding positioning post (2212). The movable baffle unit (222) is further connected to a mounting cylinder (223), the positioning column (2212) is threadedly connected to the inner wall of the mounting cylinder (223), and the movable baffle unit (222) is rotatable in a direction away from or close to the step surface through the rotational connection between the annular groove (2211) and the clamping groove (211).

8. The double-sided light guide plate according to claim 7, characterized in that: The movable baffle unit (222) comprises a first plate (2221) connected to the mounting cylinder (223) and a second plate (2222) connected to the end of the first plate (2221), wherein the second plate (2222) is used to cover the step surface; the end of the clamping member (221) away from the positioning frame (200) is configured as a magnetic attraction portion; On one side of the light guide plate body (100) along the second direction, the side of the magnetic attraction portion of the clamping member (221) close to the second plate body (2222) is a first magnetic pole; on the other side of the light guide plate body (100) along the second direction, the side of the magnetic attraction portion of the clamping member (221) close to the second plate body (2222) is a second magnetic pole; the polarities of the first magnetic pole and the second magnetic pole are opposite.

9. A method for processing a double-sided light guide plate, characterized in that: For preparing the double-sided light guide plate according to any one of claims 1 to 8, comprising: Providing a light guide plate body, wherein a light guide surface of the light guide plate body is pre-formed with a micro light guide structure; Forming positioning grooves on both surfaces of the light guide plate body, and forming engraved line structures on the positioning grooves; After shielding the positioning portion of the light guide plate body, a reflective coating is sprayed on the light guide side surface of the light guide plate body.

10. A backlight module, characterized in that: The double-sided light guide plate comprises the double-sided light guide plate according to any one of claims 1 to 8, wherein a light source is provided on one side of the light incident surface (103) of the double-sided light guide plate.

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