Side-entry light guide structure, backlight module and display device

Abstract

The present invention provides a side-entry light guide structure, a backlight module and a display device, including a light guide plate, wherein the light guide plate has a mounting surface, a light incident surface and a light emitting surface, wherein the mounting surface is arranged opposite to the light emitting surface, one side of the light incident surface is connected to the light emitting surface, and the other side is connected to the mounting surface; the light emitting surface has a lamp shadow area on the side close to the light incident surface, wherein a through groove is provided in the lamp shadow area, wherein the through groove is recessed toward the mounting surface, and wherein a filler for dispersing the light beam is provided in the through groove. In the technical solution of the present invention, the light beams of the LED lamp beads are dispersed and distributed to the dark areas in the lamp shadow area. Thus, the light beams on the light incident surface of the light guide plate are uniformly arranged without increasing the number of LED lamp beads, thereby optimizing the lamp shadow problem. The overall production cost is reduced, the heat dissipation requirements are reduced, and the reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of light sources for display devices, and in particular to an edge-entry light guide structure, a backlight module and a display device. Background Art

[0002] In traditional side-entry modules, the LED light bar is located on the side end of the module, and the point light source is converted into a surface light source through the light guide plate. The light beam of the LED light source has a strong collimation, that is, the forward beam is strong and the edge beam is weak, and it presents a light-emitting angle of about 120°. Due to the non-continuous arrangement of LEDs, the light-entry side will form a problem of alternating light and dark shadows. Please refer to Figure 1 The light beam of the LED lamp bead has a strong degree of collimation, with a strong forward light beam and a weak edge light beam. Due to the discontinuous arrangement design of the LED lamp beads and a light-emitting angle of about 120°, the light beam will form an array arrangement of alternating dark areas M and bright areas L near the light incident surface of the light guide plate 10' after being refracted at the medium interface, and the boundary between the bright area and the dark area is obvious, that is, the lamp shadow area on the light guide plate 10' described in the present invention, thereby forming a lamp shadow problem.

[0003] The existing technology usually adopts methods such as increasing the number of LED lamp beads, improving the driving power of LED lamp beads, and using high-gain diaphragms to increase the brightness, which leads to an increase in the overall cost of the equipment, an increase in heat dissipation requirements, and a decrease in reliability. Summary of the invention

[0004] The main purpose of the present invention is to provide an edge-entry light guide structure, a backlight module and a display device, aiming to solve the technical problems in the prior art of increasing the brightness by adding an edge-entry backlight light source, resulting in increased costs, increased heat dissipation requirements and reduced reliability.

[0005] In order to achieve the above object, the present invention provides an edge-entry light guide structure, comprising:

[0006] A light guide plate, the light guide plate having a mounting surface, a light incident surface and a light emitting surface, the mounting surface being arranged opposite to the light emitting surface, one side of the light incident surface being connected to the light emitting surface, and the other side of the light incident surface being connected to the mounting surface;

[0007] The light emitting surface has a lamp shadow area on one side close to the light incident surface. A through groove is provided in the lamp shadow area. The through groove is recessed toward one side of the mounting surface. A filler for dispersing the light beam is provided in the through groove.

[0008] Optionally, the mounting surface has a plurality of concave structures recessed toward the light emitting surface, the plurality of concave structures are evenly spaced from a side close to the light incident surface to a side away from the light incident surface, and the filler is disposed in the concave structures.

[0009] Optionally, the concave-dot structures are hemispherical, and the radius of the plurality of concave-dot structures gradually increases from a side close to the light incident surface to a side far from the light incident surface.

[0010] Optionally, the filler includes OCA optical glue, bubbles and core particles, and the OCA optical glue, the bubbles and the core particles are uniformly mixed.

[0011] Optionally, a blank gap is provided between the through slot and the light incident surface.

[0012] Optionally, the sum of the width of the blank gap and the width of the through groove is equal to the width of the light shadow area.

[0013] Optionally, the width of the blank gap is 1.5 mm to 3 mm, and the recessed depth of the through groove is 0.1 mm to 0.2 mm.

[0014] Optionally, the edge-entry light guide structure further includes a filling layer, the filling layer is arranged in the light guide plate, and the filling layer is located between the light emitting surface and the mounting surface, and the filling layer contains the filler;

[0015] There is a gap between the filling layer and the light incident surface, or the filling layer is in contact with the light incident surface.

[0016] In addition, to solve the above problems, the present invention also proposes a backlight module, which includes a back panel, a light source, and the side-entry light guide structure as mentioned above, wherein the side-entry light guide structure is arranged on the back panel, the light source is arranged on one side of the light incident surface, and the illumination direction of the light source is toward the light incident surface in the side-entry light guide structure.

[0017] In addition, in order to solve the above problem, the present invention further proposes a display device, and the display device is applied with the above-mentioned backlight module.

[0018] In the technical solution of the present invention, the through groove is set at the position of the above-mentioned lamp shadow area, and the filler for dispersing the light beam of the LED lamp beads is filled in the through groove, so as to fold, reflect and scatter the light beam of the LED lamp beads incident on the light incident surface, and the light beam of the LED lamp beads is scattered and distributed to various dark areas in the lamp shadow area. In this way, the light beam of the light incident surface of the light guide plate is evenly arranged without increasing the number of LED lamp beads, and the lamp shadow problem is optimized. The overall production cost is reduced, the heat dissipation requirements are reduced, and the reliability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a light shadow area effect diagram in the prior art;

[0021] Figure 2 It is a structural schematic diagram of an embodiment of the side-entry light guide structure of the present invention;

[0022] Figure 3 It is a structural schematic diagram of another embodiment of the edge-type light guide structure of the present invention;

[0023] Figure 4 It is a structural schematic diagram of another embodiment of the edge-entry light guide structure of the present invention;

[0024] Figure 5 for Figure 2 A magnified schematic diagram of the filler in region C.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0026] Figure 1 Description of the accompanying figures:

[0027] Label name Label name 10’ Light guide plate

[0028] Figure 2 to Figure 5 Description of the accompanying figures:

[0029] Label name Label name 10 Light guide plate 11 Light incident surface 12 Light emitting surface 13 Mounting surface 20 Through slot 30 Concave structure 40 Filling layer 51 OCA optical adhesive 52 bubble 53 Kernel Particles DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides a side-entry light guide structure, please refer to Figure 2 , including a light guide plate 10, the light guide plate 10 having a mounting surface 13, a light incident surface 11 and a light emitting surface 12, the mounting surface 13 is arranged opposite to the light emitting surface 12, one side of the light incident surface 11 is connected to the light emitting surface 12, and the other side is connected to the mounting surface 13; the light emitting surface 12 has a lamp shadow area on a side close to the light incident surface 11, a through groove 20 is provided in the lamp shadow area, the through groove 20 is recessed toward the side of the mounting surface 13, and a filler is provided in the through groove 20.

[0036] In this embodiment, the light guide plate 10 may be arranged in a rectangular shape, and the light emitting surface 12 is arranged opposite to the mounting surface 13, and the mounting surface 13 is used to be mounted on an external structure, such as the back panel of a display device. The side of the light guide plate 10 close to the LED lamp beads is the light incident surface 11, and the side opposite to the light incident surface 11 is the far light surface. The light incident surface 11 and the light emitting surface 12 are perpendicular to each other. However, in some cases, the light guide plate 10 may also be arranged in other shapes, that is, the light incident surface 11 and the light emitting surface 12 are non-vertical structures. Thereby improving the compatibility of the edge-entry backlight source described in the present invention.

[0037] When the side-entry light guide structure of the present invention is applied to a backlight module, the light source is arranged on one side of the light incident surface 11. The light source may include a plurality of LED lamp beads, which are arranged at intervals along the direction from the light emitting surface 12 to the mounting surface 13, and the irradiation directions of the plurality of LED lamp beads are all toward the light incident surface 11 (see Figure 2 The incident light direction A) is emitted from the light emitting surface 12 under the action of the light guide plate 10 (please refer to Figure 2 Specifically, in the prior art, in order to reduce the lamp shadow problem, the most direct way is to increase the number of LED lamp beads to reduce the distance between light sources and use a high-configuration film to improve shielding. This method not only increases the cost, but also increases the heat dissipation requirements and reduces reliability.

[0038] Therefore, in this embodiment, the through groove 20 is opened at the position of the lamp shadow area, and the filler is filled in the through groove 20. Under the action of the filler, the incident light is refracted, reflected and scattered after passing through the filler, thereby breaking up the light beam emitted by the light source, weakening the boundary between the bright area and the dark area, and avoiding the problem of lamp shadow. For details, please refer to Figure 5 , the filler can be OCA optical glue and foaming agent mixed in a certain proportion. During the manufacturing process or the use process, the filler is heated to form the OCA optical glue, the bubbles 52, the core particles 53, or the bubbles with cores 52, etc., which are stacked in a structure, that is, irregularly and evenly mixed in the through groove 20. The incident light emitted by the LED lamp bead refracts and reflects back and forth between the bubbles 52 and the OCA optical glue, and forms a scattered light beam when encountering the core particles 53. Thereby effectively breaking up the light beam intensive area facing the LED lamp bead and distributing it to the adjacent dark area.

[0039] It should be noted that in this embodiment, OCA optical glue is added into the through groove 20 to form the OCA optical glue, and the foaming agent can be made of materials such as sodium bicarbonate, and the carbon dioxide formed after the heating reaction serves as the bubbles 52, and the sodium carbonate formed serves as the core particles 53. Sodium bicarbonate is cheap, so it can further reduce the production cost of the side-entry light guide structure of the present invention. In addition, the foaming agent can also be made of other materials with higher stability or by adding a variety of different materials, etc., so as to further improve the wide adaptability of the side-entry light guide structure of the present invention.

[0040] In the technical solution of the present invention, the through groove 20 is arranged at the position of the above-mentioned lamp shadow area, and the filler for dispersing the light beam of the LED lamp beads is filled in the through groove 20, so as to fold, reflect and scatter the light beam of the LED lamp beads incident on the light incident surface 11 in the forward direction, and the light beam of the LED lamp beads is scattered and distributed to each dark area in the lamp shadow area. In this way, the light beam of the light incident surface 11 of the light guide plate 10 is evenly arranged without increasing the number of LED lamp beads, and the lamp shadow problem is optimized. The overall production cost is reduced, the heat dissipation requirements are reduced, and the reliability is improved.

[0041] Furthermore, the mounting surface 13 has a plurality of concave structures 30 that are recessed toward the light emitting surface 12. The plurality of concave structures 30 are evenly spaced from the side close to the light incident surface 11 to the side away from the light incident surface 11, and the filler is provided in the concave structures 30. In the present embodiment, the plurality of concave structures 30 are evenly spaced in the direction from the light incident surface 11 to the circular light surface. The concave structures 30 are similar to the through grooves 20. The mounting surface 13 is recessed toward the side of the light emitting surface 12 to form the concave structures 30. The filler is also added in the recess, so that the light beam emitted by the LED lamp bead can also be refracted, reflected, and scattered after passing through the filler in the concave structures 30, thereby further improving the uniformity of light beam emission in the side-entry light guide structure of the present invention and further avoiding the problem of lamp shadow.

[0042] The shape of the concave structure 30 can be adjusted according to different application scenarios, for example, it can be a hemisphere, a prism, a pyramid, etc. In this embodiment, the hemisphere of the concave structure 30 is used as an example for explanation, and the radius of the multiple concave structures 30 gradually increases from the side close to the light incident surface 11 to the side away from the light incident surface 11. Among them, the concave structure 30 with the smallest diameter can be set at about 0.01mm, and the radius change law of the multiple concave structures 30 can be set according to the change law of the approximate Gaussian curve. It should be noted that when the concave structure 30 is set to other shapes, the above diameter size can be equivalently replaced by, for example, the side length of a prism.

[0043] Furthermore, a blank gap is provided between the through groove 20 and the light incident surface 11. In actual use, in order to avoid the situation where the filler overflows when adding the filler into the through groove 20, resulting in a decrease in the overall display effect, a certain gap is reserved between the through groove 20 and the light incident surface 11, namely the blank gap. This improves the convenience of injecting the filler and indirectly improves production efficiency.

[0044] In the above process, in order to further ensure the dispersion of the filler in the through groove 20, the width d of the blank gap should be minimized (see Figure 2 The sum of the width d of the blank gap and the width of the through slot 20 is equal to the width D of the light shadow area. Specifically, the width of the blank gap is 1.5mm to 3mm, and the recessed depth H of the through slot 20 is 0.1mm to 0.2mm. It should be noted that this embodiment includes but is not limited to the above scheme, and the width of the blank gap and the recessed depth of the through slot 20 can be further adjusted according to the requirements of different backlight modules.

[0045] Furthermore, the side-entry light guide structure further includes a filling layer 40, see Figure 3 and Figure 4 The filling layer 40 is arranged in the light guide plate 10, and the filling layer 40 is located between the light emitting surface 12 and the mounting surface 13, and the filling layer 40 contains the filler; wherein, there is a gap between the filling layer 40 and the light incident surface 11, or the filling layer 40 is in contact with the light incident surface 11.

[0046] In order to further improve the display effect of the side-entry light guide structure of the present invention, the filling layer 40 is additionally added between the light output surface 12 and the mounting surface 13, and the filler is also added to the filling layer 40. As an embodiment, the filling layer 40 can be spaced apart from the light input surface 11, and the length of the filling layer 40 is slightly smaller than the length of the light input surface 11. After the incident light of the light source enters the light guide plate 10 from the light input surface 11, it directly enters the filling layer 40, and after being reflected, refracted and scattered by the filling layer 40, it is finally emitted from the scattering light output surface 12. As another embodiment, the scattering filling layer 40 can also be directly attached to the light input surface 11. In this embodiment, the length of the filling layer 40 can also be set to be slightly smaller than the length of the light input surface 11, or the length of the filling layer 40 can be set to be the same as the length of the light input surface 11, thereby further improving the compatibility of the side-entry light guide structure of the present invention. It should be noted that, in the above two solutions, the filling layer 40 and the through groove 20 may exist at the same time, or only the filling layer 40 may be provided separately, and both can achieve the goal of avoiding the problem of lamp shadow.

[0047] In addition, to solve the above problems, the present invention also proposes a backlight module, which includes a back panel, a light source, and the side-entry light guide structure as described above, wherein the side-entry light guide structure is arranged on the back panel, the light source is arranged on one side of the side-entry light guide structure, and the illumination direction of the light source is toward the light incident surface 11 in the side-entry light guide structure.

[0048] In this embodiment, the light guide plate 10 may be arranged in a rectangular shape, and the light emitting surface 12 is arranged opposite to the mounting surface 13, and the mounting surface 13 is used to be mounted on an external structure, such as the back panel of a display device. The side of the light guide plate 10 close to the LED lamp beads is the light incident surface 11, and the side opposite to the light incident surface 11 is the far light surface. The light incident surface 11 and the light emitting surface 12 are perpendicular to each other. However, in some cases, the light guide plate 10 may also be arranged in other shapes, that is, the light incident surface 11 and the light emitting surface 12 are non-vertical structures. Thereby improving the compatibility of the edge-entry backlight source described in the present invention.

[0049] When the side-entry light guide structure of the present invention is applied to a backlight module, the light source is arranged on one side of the light incident surface 11, and the light source may include a plurality of LED lamp beads, which are arranged at intervals along the direction from the light emitting surface 12 to the mounting surface 13, and the irradiation directions of the plurality of LED lamp beads are all toward the light incident surface 11. In the prior art, in order to reduce the problem of lamp shadow, the most direct way is to increase the number of LED lamp beads to reduce the distance between light sources and use a high-configuration film to improve shielding. This method not only increases the cost, but also increases the heat dissipation requirements and reduces reliability.

[0050] Therefore, in this embodiment, the through groove 20 is opened at the position of the lamp shadow area, and the filler is filled in the through groove 20. Under the action of the filler, the incident light is refracted, reflected and scattered after passing through the filler, thereby breaking up the light beam emitted by the light source, weakening the boundary between the bright area and the dark area, and avoiding the problem of lamp shadow. For details, please refer to Figure 5 , the filler can be OCA optical glue and foaming agent mixed in a certain proportion. During the manufacturing process or the use process, the filler is heated to form the OCA optical glue, the bubbles 52, the core particles 53, or the bubbles with cores 52, etc., which are stacked in a structure, that is, irregularly and evenly mixed in the through groove 20. The incident light emitted by the LED lamp bead refracts and reflects back and forth between the bubbles 52 and the OCA optical glue, and forms a scattered light beam when encountering the core particles 53. Thereby effectively breaking up the light beam intensive area facing the LED lamp bead and distributing it to the adjacent dark area.

[0051] It should be noted that in this embodiment, OCA optical glue is added into the through groove 20 to form the OCA optical glue, and the foaming agent can be made of materials such as sodium bicarbonate, and the carbon dioxide formed after the heating reaction serves as the bubbles 52, and the sodium carbonate formed serves as the core particles 53. Sodium bicarbonate is cheap, so it can further reduce the production cost of the side-entry light guide structure of the present invention. In addition, the foaming agent can also be made of other materials with higher stability or by adding a variety of different materials, etc., so as to further improve the wide adaptability of the side-entry light guide structure of the present invention.

[0052] In the technical solution of the present invention, the through groove 20 is arranged at the position of the above-mentioned lamp shadow area, and the filler for dispersing the light beam of the LED lamp beads is filled in the through groove 20, so as to fold, reflect and scatter the light beam of the LED lamp beads incident on the light incident surface 11 in the forward direction, and the light beam of the LED lamp beads is scattered and distributed to each dark area in the lamp shadow area. In this way, the light beam of the light incident surface 11 of the light guide plate 10 is evenly arranged without increasing the number of LED lamp beads, and the lamp shadow problem is optimized. The overall production cost is reduced, the heat dissipation requirements are reduced, and the reliability is improved.

[0053] In addition, to solve the above-mentioned problems, the present invention further proposes a display device, and the above-mentioned display device is applied with a backlight module as mentioned above. In this embodiment, the light guide plate 10 can be arranged in a rectangular shape, and the light emitting surface 12 is arranged opposite to the mounting surface 13, and the mounting surface 13 is used to be installed on an external structure, such as the back plate of the display device. The side of the light guide plate 10 close to the LED lamp bead is the light incident surface 11, and the side opposite to the light incident surface 11 is the far light surface. The light incident surface 11 and the light emitting surface 12 are perpendicular to each other. However, in some cases, the light guide plate 10 can also be arranged in other shapes, that is, the light incident surface 11 and the light emitting surface 12 are non-vertical structures. Thereby improving the compatibility of the edge-entry backlight light source described in the present invention.

[0054] When the side-entry light guide structure of the present invention is applied to a backlight module, the light source is arranged on one side of the light incident surface 11, and the light source may include a plurality of LED lamp beads, which are arranged at intervals along the direction from the light emitting surface 12 to the mounting surface 13, and the irradiation directions of the plurality of LED lamp beads are all toward the light incident surface 11. In the prior art, in order to reduce the problem of lamp shadow, the most direct way is to increase the number of LED lamp beads to reduce the distance between light sources and use a high-configuration film to improve shielding. This method not only increases the cost, but also increases the heat dissipation requirements and reduces reliability.

[0055] Therefore, in this embodiment, the through groove 20 is opened at the position of the lamp shadow area, and the filler is filled in the through groove 20. Under the action of the filler, the incident light is refracted, reflected and scattered after passing through the filler, thereby breaking up the light beam emitted by the light source, weakening the boundary between the bright area and the dark area, and avoiding the problem of lamp shadow. For details, please refer to Figure 5 , the filler can be OCA optical glue and foaming agent mixed in a certain proportion. During the manufacturing process or the use process, the filler is heated to form the OCA optical glue, the bubbles 52, the core particles 53, or the bubbles with cores 52, etc., which are stacked in a structure, that is, irregularly and evenly mixed in the through groove 20. The incident light emitted by the LED lamp bead refracts and reflects back and forth between the bubbles 52 and the OCA optical glue, and forms a scattered light beam when encountering the core particles 53. Thereby effectively breaking up the light beam intensive area facing the LED lamp bead and distributing it to the adjacent dark area.

[0056] It should be noted that in this embodiment, OCA optical glue is added into the through groove 20 to form the OCA optical glue, and the foaming agent can be made of materials such as sodium bicarbonate, and the carbon dioxide formed after the heating reaction serves as the bubbles 52, and the sodium carbonate formed serves as the core particles 53. Sodium bicarbonate is cheap, so it can further reduce the production cost of the side-entry light guide structure of the present invention. In addition, the foaming agent can also be made of other materials with higher stability or by adding a variety of different materials, etc., so as to further improve the wide adaptability of the side-entry light guide structure of the present invention.

[0057] In the technical solution of the present invention, the through groove 20 is arranged at the position of the above-mentioned lamp shadow area, and the filler for dispersing the light beam of the LED lamp beads is filled in the through groove 20, so as to fold, reflect and scatter the light beam of the LED lamp beads incident on the light incident surface 11 in the forward direction, and the light beam of the LED lamp beads is scattered and distributed to each dark area in the lamp shadow area. In this way, the light beam of the light incident surface 11 of the light guide plate 10 is evenly arranged without increasing the number of LED lamp beads, and the lamp shadow problem is optimized. The overall production cost is reduced, the heat dissipation requirements are reduced, and the reliability is improved.

[0058] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A side-entry light guide structure, characterized in that: include: A light guide plate, the light guide plate having a mounting surface, a light incident surface and a light emitting surface, the mounting surface being arranged opposite to the light emitting surface, one side of the light incident surface being connected to the light emitting surface, and the other side of the light incident surface being connected to the mounting surface; A lamp shadow area is provided on one side of the light emitting surface close to the light incident surface, a through groove is provided in the lamp shadow area, the through groove is recessed toward one side of the mounting surface, and a filler for dispersing the light beam is provided in the through groove; The mounting surface has a plurality of concave structures that are recessed toward the light emitting surface, the plurality of concave structures are evenly spaced from the side close to the light incident surface to the side away from the light incident surface, and the filler is disposed in the concave structures; The concave point structure is hemispherical, and the radius of the plurality of concave point structures gradually increases from the side close to the light incident surface to the side far from the light incident surface; the concave point structure with the smallest diameter is set to 0.01 mm, wherein the radius variation rule of the plurality of concave point structures can be set according to the variation rule of an approximate Gaussian curve; The edge-entry light guide structure further includes a filling layer, which is arranged in the light guide plate and located between the light emitting surface and the mounting surface, and contains the filler; There is a gap between the filling layer and the light incident surface, or the filling layer is in contact with the light incident surface.

2. The edge-type light guide structure according to claim 1, characterized in that: The filler includes OCA optical glue, bubbles and core particles, and the OCA optical glue, the bubbles and the core are uniformly mixed.

3. The edge-type light guide structure according to any one of claims 1 to 2, characterized in that: A blank gap is provided between the through slot and the light incident surface.

4. The edge-type light guide structure according to claim 3, characterized in that: The sum of the width of the blank gap and the width of the through groove is equal to the width of the lamp shadow area.

5. The edge-type light guide structure according to claim 3, characterized in that: The width of the blank gap is 1.5 mm to 3 mm, and the recessed depth of the through groove is 0.1 mm to 0.2 mm.

6. A backlight module, characterized in that: The backlight module includes a back panel, a light source and an edge-entry light guide structure as described in any one of claims 1 to 5, wherein the edge-entry light guide structure is arranged on the back panel, the light source is arranged on one side of the light incident surface, and the illumination direction of the light source is toward the light incident surface in the edge-entry light guide structure.

7. A display device, characterized in that: The display device is applied with the backlight module as claimed in claim 6.

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