A double-sided light guide plate and its processing method, and a backlight module

Abstract

This invention discloses a double-sided light guide plate and its processing method, as well as a backlight module, relating to the field of light guide plate processing technology. The double-sided light guide plate includes a light guide plate body, which includes a first surface and a second surface disposed opposite to each other. The light guide plate body also includes a light-incoming surface and a light-guiding side surface disposed between the first surface and the second surface. Both the first surface and the second surface include a positioning surface and a light-guiding surface disposed sequentially away from the light-incoming surface. Positioning grooves are formed on both the first positioning surface and the second positioning surface. The positioning grooves extend along a first direction parallel to the light-incoming surface, and at least part of the positioning grooves are arc grooves with intersecting engraved lines. A reflective coating is provided on the light-guiding side surface between the first light-guiding surface and the second light-guiding surface. By adopting a partitioned arrangement of the positioning surface and the light-guiding surface, light with a large scattering angle is refracted outward in the positioning surface. Combined with the reflective coating, the technical effects of light spot suppression and improved uniformity are achieved.

Description

Technical Field

[0001] This invention relates to the field of light guide plate processing technology, and in particular to a double-sided light guide plate and its processing method, and a backlight module. Background Technology

[0002] Light guide plates are key optical components in various display devices. Their function is to convert light emitted from a line light source into a uniform surface light source through total internal reflection and scattering, thereby meeting the brightness and uniformity requirements of display devices. With the rapid development of double-sided display devices such as transparent advertising screens and double-sided electronic signs, traditional single-sided light guide plates can no longer meet the demands.

[0003] Specifically, traditional single-sided light guide plates typically employ 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 internal reflections within the plate, the light intensity distribution becomes unbalanced due to interference from the microstructures on both sides. This manifests as excessively rapid brightness decay in areas far from the light source, resulting in insufficient uniformity. If the light uniformity is improved by increasing the density of the dot structure, one of the following situations will occur:

[0004] 1. When light rays incident at a large angle near the light source are scattered by dense dots, some light rays escape and form a ring-shaped halo; 2. When the dots on both sides overlap in the near-end region, the intensity of the scattered light is superimposed, forming an uncontrollable bright spot.

[0005] It is evident that existing light guide plates, when applied to double-sided light guide scenarios, suffer from insufficient light uniformity or uncontrolled near-end scattering of light sources, resulting in light spots. There is an urgent need for a new type of light guide plate to solve the technical problems of insufficient light uniformity and easy formation of light spots in double-sided display devices. Summary of the Invention

[0006] The purpose of this invention is to provide a double-sided light guide plate and its processing method, as well as a backlight module, to solve the problems of insufficient light uniformity and easy formation of light spots when the light guide plate is applied to double-sided display devices in the prior art.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A double-sided light guide plate includes a light guide plate body, the light guide plate body includes a first surface and a second surface disposed opposite to each other, and the light guide plate body also includes a light-incoming surface and a light-guiding side surface disposed between the first surface and the second surface;

[0009] The first surface includes a first positioning surface and a first light guiding surface arranged sequentially away from the light-incoming surface; the second surface includes a second positioning surface and a second light guiding surface arranged sequentially away from the light-incoming surface.

[0010] Positioning grooves are provided on both the first positioning surface and the second positioning surface. The positioning grooves extend along a first direction parallel to the light-incoming surface, and at least part of the positioning grooves are arc grooves. The arc grooves are provided with etched lines arranged in a cross pattern. A reflective coating is provided on the light-guiding side between the first light-guiding surface and the second light-guiding surface.

[0011] Optionally, along the second direction, the positioning groove on the first positioning surface coincides with the positioning groove on the second positioning surface;

[0012] Along the second direction, the engraved structure on the first positioning surface does not coincide with the engraved structure on the second positioning surface.

[0013] Optionally, the reflective coating includes a titanium dioxide coating sprayed on the light-guiding side; and a light-absorbing film layer is attached to the junction of the first light-guiding surface and the second light-guiding surface with the light-guiding side.

[0014] Optionally, the portion of the light guide plate body between the first positioning surface and the second positioning surface is a positioning part, and the portion of the light guide plate body between the first light guiding surface and the second light guiding surface is a light guiding part;

[0015] Along the second direction, the thickness of the light guide portion is less than the thickness of the positioning portion, and the light guide portion is located between the two positioning grooves.

[0016] Optionally, a positioning frame is fitted on one side of the light guide plate body; the positioning frame has an installation groove corresponding to the position of the light guide plate body, the bottom wall of the installation groove has a light transmission groove corresponding to the position of the light-incoming surface, and the end of the light guide plate body with the light-incoming surface is fitted into the installation groove;

[0017] The positioning frame extends with a positioning plate corresponding to the position of the positioning groove. The positioning plate is detachably connected to a movable baffle assembly, which at least partially covers the stepped surface between the positioning part and the light guide part.

[0018] Optionally, a positioning plate is provided on each side of the light guide plate body along the first direction, and the positioning plate is provided with a snap-fit ​​groove corresponding to the two positioning grooves respectively;

[0019] The light guide plate body is provided with a movable baffle assembly on each of its two sides along the second direction. The movable baffle assembly includes two snap-fit ​​members respectively provided at the positions of the two snap-fit ​​slots on the same side. A movable baffle unit is connected between the two snap-fit ​​members. The movable baffle unit is used to cover the stepped surface between the positioning part and the light guide part.

[0020] Optionally, the snap-fit ​​groove is a circular groove with an opening, and the snap-fit ​​member has an annular groove corresponding to the position of the snap-fit ​​groove. The snap-fit ​​member passes through the annular groove, passes through the opening, and is embedded in the snap-fit ​​groove; the snap-fit ​​member also has a protruding positioning post.

[0021] The movable baffle unit is also connected to an installation cylinder. The positioning post is threadedly connected to the inner wall of the installation cylinder. The movable baffle unit can rotate in a direction away from or close to the step surface through the rotatable connection between the annular groove and the snap-fit ​​groove.

[0022] Optionally, the movable baffle unit includes a first plate connected to the mounting cylinder and a second plate connected to the end of the first plate, the second plate being used to cover the stepped surface; the end of the snap-fit ​​member away from the positioning frame is configured as a magnetic suction part;

[0023] On one side of the light guide plate body along the second direction, the magnetic attraction portion of the snap-fit ​​member near the second plate body is a first magnetic pole; on the other side of the light guide plate body along the second direction, the magnetic attraction portion of the snap-fit ​​member near the second plate body is a second magnetic pole; the first magnetic pole and the second magnetic pole have opposite polarities.

[0024] A method for processing a double-sided light guide plate, used to prepare the double-sided light guide plate as described above, includes:

[0025] Provide a light guide plate body, the light guide surface of the light guide plate body is pre-formed with a micro light guide structure;

[0026] Positioning grooves are formed on both surfaces of the light guide plate body, and engraved lines are formed on the positioning grooves;

[0027] After blocking the positioning part of the light guide plate body, a reflective coating is sprayed onto the light guide side of the light guide plate body.

[0028] A backlight module includes a double-sided light guide plate as described above, wherein a light source is provided on one side of the light-incoming surface of the double-sided light guide plate.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The double-sided light guide plate, its processing method, and backlight module provided by this invention, by setting a positioning groove with a partially arc-shaped groove on the positioning surface, combined with a cross-line structure, can refract the light scattered to the positioning surface to the outside when the light source shines on the light guide plate body through the light-inlet surface, thereby breaking the total internal reflection of the positioning surface and avoiding bright spots near the light source. Then, the remaining light from the light source enters the area between the two light guide surfaces, forming a uniform bright surface on the two light guide surfaces. With the addition of a reflective coating, the remaining light can be efficiently reflected and circulated within the plate, enhancing the illuminance and uniformity of the light guide surface. In summary, the double-sided light guide plate, its processing method, and backlight module provided by this invention adopt a scheme of partitioning the positioning surface and the light guide surface, causing light with a large scattering angle to be refracted outward in the positioning surface. Combined with the addition of a reflective coating, this achieves the technical effects of suppressing light spots and improving uniformity. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0033] Figure 1 This is a schematic diagram of the first structure of the light guide plate body in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the second structure of the light guide plate body in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the overall structure of the double-sided light guide plate provided in an embodiment of the present invention;

[0036] Figure 4 This is a first exploded structural diagram of a double-sided light guide plate provided in an embodiment of the present invention;

[0037] Figure 5 This is a second exploded structural diagram of the double-sided light guide plate provided in an embodiment of the present invention;

[0038] Illustration: 100, light guide plate body; 110, positioning part; 120, light guide part; 101, first surface; 1011, first positioning surface; 1012, first light guide surface; 102, second surface; 1021, second positioning surface; 1022, second light guide surface;

[0039] 103. Light-inlet surface; 104. Light-guiding side surface; 105. Positioning groove; 106. Engraved structure; 107. Positioning side surface;

[0040] 200, Positioning frame; 201, Mounting slot; 202, Light transmission slot; 210, Positioning plate; 211, Snap-fit ​​slot; 220, Movable baffle assembly; 221, Snap-fit ​​piece; 2211, Annular groove; 2212, Positioning post; 222, Movable baffle unit; 2221, First plate; 2222, Second plate; 223, Mounting cylinder. Detailed Implementation

[0041] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1:

[0045] This invention provides a double-sided light guide plate, which is mainly used in various display devices, especially in double-sided display devices such as transparent advertising screens and double-sided electronic signs. With the widespread application of these devices, traditional single-sided light guide plates can no longer meet the requirements of modern display technology for brightness uniformity and light spot control. Therefore, the double-sided light guide plate structure provided in this embodiment can effectively solve the problems of insufficient light uniformity and light spot formation near the light source in the prior art.

[0046] like Figure 1 and 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 disposed opposite to each other. The light guide plate body 100 also includes a light-incoming surface 103 and a light-guiding surface 104 disposed 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 disposed sequentially along the path away from the light-incoming surface 103. The second surface 102 includes a first positioning surface 1011 and a first light-guiding surface 1012 disposed sequentially along the path away from the light-incoming surface 103. A second positioning surface 1021 and a second light-guiding surface 1022 are sequentially arranged in 103. Positioning grooves 105 are provided on both the first positioning surface 1011 and the second positioning surface 1021. The positioning grooves 105 extend along a first direction parallel to the light-entry surface 103, and at least part of the positioning grooves 105 are arc grooves. Intersecting engraved lines 106 are 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. It should be noted that the first positioning surface 1011 in the first surface 101 is used for positioning the light guide 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 protrusions, allowing light to diffuse at various angles and then break the reflection conditions before being emitted from the light guide plate body 100. The specific structure and principle of the light-guiding surface are well known to those skilled in the art, and will not be elaborated upon in this embodiment. Similarly, the second positioning surface 1021 and the second light guide surface 1022 adopt the same configuration, which will not be described in detail.

[0047] In this embodiment, the double-sided light guide plate, by setting a positioning groove 105 with a partially arc-shaped groove on the positioning surface, and in conjunction with the cross-line structure 106, can refract the light scattered to the positioning surface to the outside when the light source illuminates the light guide plate body 100 through the light-inlet surface 103, thereby breaking the total internal reflection of the positioning surface and preventing bright spots from appearing near the light source. Then, the remaining light from the light source enters the area between the two light guide surfaces, forming a uniform bright surface on the two light guide surfaces. With the addition of the reflective coating, the remaining light can be efficiently reflected and circulated within the plate, enhancing the illuminance 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, causing light with a large scattering angle to be refracted outward in the positioning surface. With the addition of the reflective coating, the technical effects of light spot suppression and improved uniformity are achieved.

[0048] Furthermore, along the second direction, the positioning groove 105 on the first positioning surface 1011 coincides with the positioning groove 105 on the second positioning surface 1021; along the second direction, the engraved structure 106 on the first positioning surface 1011 does not coincide with the engraved 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 according to the positional relationship between the double-sided light guide plate and the light source. By setting positioning grooves 105 at different positions on the positioning surface, a suitable position can be found so that when the light source illuminates the light guide plate body 100 through the light-inlet surface 103, the light scattered to the positioning surface is refracted to the outside, thus breaking the total internal reflection of the positioning surface and preventing bright spots from appearing on the light guide surface near the light source.

[0049] Specifically, when some light enters the light guide plate body 100 from the light-inlet surface 103, it is reflected and propagates within the light guide plate. The positioning groove 105, by setting etched structures 106 on the positioning surface, prevents concentrated reflection of light upon reaching the positioning groove 105, instead dispersing it in different directions. This avoids the formation of high-intensity reflection areas on the positioning surface, reducing light spots and unevenness. The positioning groove 105 is positioned before the light guide surface to guide light out of the light guide plate before some light with larger scattering angles reach the light guide surface. Thus, the light begins to disperse as it passes through the positioning groove 105, allowing the brightness of the light source to be transmitted more evenly to the light guide surface, avoiding halos or bright spots caused by excessive light concentration. Furthermore, the non-overlapping arrangement of the upper and lower etched structures 106 ensures that the direction and shape of the etched structures 106 are different when 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.

[0050] Furthermore, the reflective coating includes a titanium dioxide coating sprayed onto the light-guiding side 104; 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 104. The titanium dioxide coating reflects internal light, thereby improving the brightness and uniformity of the light guide plate body 100. The light-absorbing film layer includes, but is not limited to, materials such as carbon black, black alumina, and titanium black, which can absorb light effectively. 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 lights being reflected back into the light-guiding surface, thereby improving the backlight effect. This embodiment is not limited. In addition, the titanium dioxide coating can be replaced with aluminum powder, silver powder, etc., as long as it can reflect light, which is not limited in this embodiment.

[0051] 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 guiding surface 1012 and the second light guiding surface 1022 is the light guiding portion 120; the side of the positioning portion 110 is the positioning side surface 107, and no reflective coating is provided on the positioning side surface 107 along the second direction; the thickness of the light guiding portion 120 is less than the thickness of the positioning portion 110, and the light guiding portion 120 is located between the two positioning grooves 105.

[0052] It should be noted that the thicker positioning part 110 not only provides physical support and positional constraint, but also places the upper and lower positioning grooves 105 on both sides of the light guide part 120. This reduces unnecessary light loss during reflection and scattering in the light guide part 120, ultimately achieving more uniform light output. Simultaneously, when large-angle light enters the light guide plate, it easily forms a ring-shaped halo or a concentrated area in the near-end region. When the positioning grooves 105 and the light guide surface are not on the same plane, the large-angle light is effectively guided to an appropriate refraction path, avoiding this ring-shaped halo phenomenon and thus reducing the non-uniformity of the near-end of the light guide surface.

[0053] Based on the above embodiments, a positioning frame 200 is sleeved on one side of the light guide plate body 100; the positioning frame 200 is provided with an installation groove 201 corresponding to the position of the light guide plate body 100, and a light transmission groove 202 is provided on the bottom wall of the installation groove 201 corresponding to the position of the light-incident surface 103. The end of the light guide plate body 100 with the light-incident surface 103 is sleeved in the installation groove 201; a positioning plate 210 is provided extending from the positioning frame 200 corresponding to the position of the positioning groove 105, and a movable baffle assembly 220 is detachably connected to the positioning plate 210. The movable baffle assembly 220 at least partially covers the stepped surface between the positioning part 110 and the light guide part 120.

[0054] The positioning frame 200 provides stable mechanical support for the light guide plate body 100. Meanwhile, the movable baffle assembly 220, after adjustment, can cover the stepped surface, effectively preventing uneven light scattering and avoiding interference between light emitted from the positioning surface and light emitted from the light guide surface. Furthermore, the detachable design of the positioning plate 210 and the movable baffle assembly 220 gives the double-sided light guide plate greater flexibility and ease of maintenance, further improving light efficiency and display stability.

[0055] Specifically, such as 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-fit ​​groove 211 corresponding to the two positioning grooves 105 respectively; 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-fit ​​pieces 221 respectively provided at the positions of the two snap-fit ​​grooves 211 on the same side, and a movable baffle unit 222 is connected between the two snap-fit ​​pieces 221. The movable baffle unit 222 is used to cover the stepped surface between the positioning part 110 and the light guide part 120.

[0056] As an optional implementation, the snap-fit ​​groove 211 is a circular groove with an opening. The opening portion of the circular groove should be elastic to facilitate the snap-fit ​​member 221 snapping into the snap-fit ​​groove 211. The snap-fit ​​member 221 has an annular groove 2211 at the position corresponding to the snap-fit ​​groove 211. The snap-fit ​​member 221 passes through the opening via the annular groove 2211 and is embedded in the snap-fit ​​groove 211. The snap-fit ​​member 221 also has a protruding positioning post 2212. The movable baffle unit 222 is also connected to the mounting cylinder 223. The positioning post 2212 is threadedly connected to the inner wall of the mounting cylinder 223. The movable baffle unit 222 can rotate in a direction away from or close to the step surface through the rotatable connection between the annular groove 2211 and the snap-fit ​​groove 211.

[0057] 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 being used to cover the stepped surface; or,

[0058] 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 in the figure), which is used to cover the positioning side.

[0059] It is understandable that the movable baffle unit 222 is threadedly connected to the positioning post 2212, enabling the replacement of the movable baffle unit 222 in the movable baffle assembly 220 to suit the following two scenarios:

[0060] 1. Before spraying a reflective coating on the light-guiding side 104 of the light guide plate body 100, replace it with another movable baffle. The difference between this movable baffle and the movable baffle unit 222 in this embodiment is that a third plate is connected to its side, and the third plate can cover the positioning side. Thus, when spraying the reflective coating, it can prevent the reflective coating from adhering to the positioning side 107, and ensure that no reflective coating is provided on the positioning side 107, thereby avoiding the positioning side 107 from focusing light by reflection to form a bright spot at the edge of the light guide surface.

[0061] 2. When the double-sided light guide plate is installed in the backlight module, the movable baffle unit 222 without the third plate is replaced to reduce the width of the double-sided light guide plate and make it easier to meet the assembly requirements of the double-sided light guide plate; and the second plate 2222 serves to separate the positioning surface and the light guide surface. When light with a large scattering angle is refracted outward through the positioning groove 105, the first plate 2221 and the second plate 2222 effectively prevent the light at the positioning groove 105 from spreading to the top of the light guide surface, thereby improving the display effect.

[0062] Furthermore, 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 end of the snap-fit ​​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 magnetic attraction portion of the snap-fit ​​member 221 near the second plate 2222 is a first magnetic pole. On the other side of the light guide plate body 100 along the second direction, the magnetic attraction portion of the snap-fit ​​member 221 near the second plate 2222 is a second magnetic pole. The polarities of the first magnetic pole and the second magnetic pole are opposite. Thus, the polarities of the first magnetic pole and the second magnetic pole are opposite, preventing the baffle assembly from loosening or shifting, and enabling the movable baffle unit 222 to close automatically. This simplifies the installation and adjustment process of the movable baffle assembly 220. Through magnetic connection, the operator can quickly and accurately place the movable baffle unit in the predetermined position.

[0063] Example 2:

[0064] This embodiment also provides a method for processing a double-sided light guide plate, used to prepare the double-sided light guide plate in Embodiment 1, comprising:

[0065] S1. Provide a light guide plate body 100, the light guide surface of the light guide plate body 100 is pre-formed with a micro light guide structure;

[0066] S2. Positioning grooves 105 are formed on both surfaces of the light guide plate body 100, and engraving structures 106 are formed on the positioning grooves 105; wherein, the specific processing method is not limited, including but not limited to CNC processing, laser processing, engraving, etc.

[0067] S3. After blocking the positioning part 110 of the light guide plate body 100, a reflective coating is sprayed onto the light guide side 104 of the light guide plate body 100.

[0068] The process of blocking the positioning part 110 of the light guide plate body 100 includes:

[0069] S31. Select a movable baffle unit 222; 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; the second plate 2222 is connected to a third plate (not shown in the figure), the third plate is used to cover the positioning side 107.

[0070] S32. Install snap-fit ​​pieces 221 on both sides of the movable baffle unit 222 by threaded connection, and snap-fit ​​pieces 221 into snap-fit ​​grooves 211 accordingly; under the action of the first magnetic pole and the second magnetic pole, the two movable baffle units 222 approach each other to cover the step surface and the positioning side 107.

[0071] The movable baffle unit 222 is installed on the positioning groove 105;

[0072] 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 cylinder 223 and a second plate 2222 connected to the end of the first plate 2221, the second plate 2222 being used to cover the stepped surface;

[0073] The steps S31 and S32, primarily by covering the positioning side 107 with the third plate, effectively prevent the reflective coating from contaminating this area. Thus, during the spraying of the reflective coating, the positioning side 107 remains clean, preventing direct coverage by the reflective coating and avoiding unnecessary light spots or bright spots during light propagation, ensuring the light output effect of the double-sided light guide plate. After spraying, another movable baffle unit 222 can be replaced to reduce the overall width of the double-sided light guide plate, meeting the installation requirements of the backlight module. Combined 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. Furthermore, the two types of movable baffle units 222 share a single positioning structure, ensuring both processing and installation accuracy while reducing additional development investment in the positioning structure, resulting in low cost. In summary, this processing method for the double-sided light guide plate meets the size requirements of the double-sided light guide plate, ensures its light output effect, and also boasts advantages such as high processing efficiency and high processing accuracy.

[0074] Example 3:

[0075] This embodiment also provides a backlight module, including the double-sided light guide plate in Embodiment 1, wherein a light source is provided on one side of the light-inlet surface 103 of the double-sided light guide plate.

[0076] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate 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) includes a first surface (101) and a second surface (102) disposed opposite to each other. The light guide plate body (100) also includes a light-inlet surface (103) and a light-guiding side surface (104) disposed 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 sequentially away from the light-incoming surface (103), and the second surface (102) includes a second positioning surface (1021) and a second light guiding surface (1022) arranged sequentially away from the light-incoming surface (103); the portion of the light guide plate body (100) between the first positioning surface (1011) and the second positioning surface (1021) is a positioning part (110), and the portion of the light guide plate body (100) between the first light guiding surface (1012) and the second light guiding surface (1022) is a light guiding part (120). Positioning grooves (105) are provided on both the first positioning surface (1011) and the second positioning surface (1021). The positioning grooves (105) extend along a first direction parallel to the light-entry surface (103), and at least part of the positioning grooves (105) are arc grooves. The arc grooves are provided with etched lines (106) arranged in a cross pattern. 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). Along a second direction parallel to the light-entry surface (103) and perpendicular to the first direction, the thickness of the light-guiding part (120) is less than the thickness of the positioning part (110), and the light-guiding part (120) is located between the two positioning grooves (105). 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-fit ​​groove (211) corresponding to the two positioning grooves (105). The light guide plate body (100) is provided with a movable baffle assembly (220) on both sides along the second direction. The movable baffle assembly (220) includes two snap-fit ​​pieces (221) respectively provided at the positions of the two snap-fit ​​slots (211) on the same side. A movable baffle unit (222) is connected between the two snap-fit ​​pieces (221). The movable baffle unit (222) is used to cover the stepped surface between the positioning part (110) and the light guide part (120).

2. A 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) coincides with the positioning groove (105) on the second positioning surface (1021); Along the second direction, the engraved structure (106) on the first positioning surface (1011) does not coincide with the engraved structure (106) on the second positioning surface (1021).

3. A double-sided light guide plate according to claim 1, characterized in that, The reflective coating includes a titanium dioxide coating sprayed on the light-guiding side surface (104); light-absorbing film layers are 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).

4. A double-sided light guide plate according to claim 1, characterized in that, A positioning frame (200) is fitted on one side of the light guide plate body (100); the positioning frame (200) has an installation groove (201) corresponding to the position of the light guide plate body (100), and the bottom wall of the installation groove (201) has a light transmission groove (202) corresponding to the position of the light-inlet surface (103). The end of the light guide plate body (100) with the light-inlet surface (103) is fitted into the installation groove (201). The positioning frame (200) is provided with a positioning plate (210) extending from the position of the positioning groove (105). The positioning plate (210) is detachably connected to a movable baffle assembly (220). The movable baffle assembly (220) at least partially covers the stepped surface between the positioning part (110) and the light guide part (120).

5. A double-sided light guide plate according to claim 4, characterized in that, The snap-fit ​​groove (211) is a circular groove with an opening. The snap-fit ​​member (221) has an annular groove (2211) at the position corresponding to the snap-fit ​​groove (211). The snap-fit ​​member (221) passes through the opening through the annular groove (2211) and is embedded in the snap-fit ​​groove (211). The snap-fit ​​member (221) also has a protruding positioning post (2212). The movable baffle unit (222) is also connected to the mounting cylinder (223). The positioning post (2212) is threadedly connected to the inner wall of the mounting cylinder (223). The movable baffle unit (222) can rotate in the direction away from or close to the step surface through the rotatable connection between the annular groove (2211) and the snap-fit ​​groove (211).

6. A double-sided light guide plate according to claim 5, characterized in that, 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) being used to cover the stepped surface; the end of the snap-fit ​​member (221) away from the positioning frame (200) is configured as a magnetic suction part; On one side of the light guide plate body (100) along the second direction, the magnetic attraction portion of the snap-fit ​​member (221) near 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 magnetic attraction portion of the snap-fit ​​member (221) near the second plate body (2222) is a second magnetic pole; the polarities of the first magnetic pole and the second magnetic pole are opposite.

7. A method for processing a double-sided light guide plate, characterized in that, For preparing the double-sided light guide plate as described in any one of claims 1-6, comprising: Provide a light guide plate body, the light guide surface of the light guide plate body is pre-formed with a micro light guide structure; Positioning grooves are formed on both surfaces of the light guide plate body, and engraved lines are formed on the positioning grooves; After blocking the positioning part of the light guide plate body, a reflective coating is sprayed onto the light guide side of the light guide plate body.

8. A backlight module, characterized in that, The invention includes a double-sided light guide plate as described in any one of claims 1-6, wherein a light source is provided on one side of the light-inlet surface (103) of the double-sided light guide plate.

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