Light guide structure, backlight module and display device

Abstract

A light guide structure (1), a backlight module and a display device. The light guide structure (1) comprises a plurality of light guide plates (10), wherein the plurality of light guide plates (10) are arranged in an array and are tiled in sequence, and two adjacent light guide plates (10) are bonded and fixed by means of a reflective adhesive layer (20).

Description

Light guide structure, backlight module and display device

[0001] The present application claims priority to the Chinese patent application No. 202421305627.3, filed on June 7, 2024, and entitled "Light guide structure, backlight module and display device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of light guide structure, backlight module and display device, and in particular, to a light guide structure, a backlight module and a display device. BACKGROUND

[0003] Direct backlight display products set the dot matrix formed by the light emitting device behind the screen, directly irradiate the screen by the light emitting dot matrix to perform light emitting display, so that local light control can be performed. TECHNICAL PROBLEM

[0004] However, the zoning light control effect of the direct backlight display product in the related art is not ideal, and there is a relatively obvious halo problem, which leads to poor display quality. TECHNICAL SOLUTION

[0005] The embodiments of the present disclosure provide a light guide structure, a backlight module and a display device, which can eliminate or at least greatly reduce the halo problem, effectively improve the zoning light control display effect and display quality.

[0006] In a first aspect, the embodiments of the present disclosure provide a light guide structure, comprising a plurality of light guide plates, the plurality of light guide plates are arrayed and sequentially spliced, and two adjacent light guide plates are bonded and fixed by a reflective adhesive layer.

[0007] In some embodiments, the reflective adhesive layer is a milky white or white adhesive layer.

[0008] In some embodiments, the light guide plate comprises a light guide plate body, the light guide plate body has oppositely arranged light emitting surface and back surface, and the back surface is provided with a light inlet hole.

[0009] In some embodiments, the light guide plate further comprises a reflective layer, the reflective layer covers the bottom wall of the light inlet hole.

[0010] In some embodiments, the bottom wall of the light inlet hole has a tapered structure, the tapered structure extends and protrudes towards the opening part of the light inlet hole.

[0011] In some embodiments, the light guide plate comprises a light guide plate body, the light guide plate body has oppositely arranged light emitting surface and back surface, and the light emitting surface is provided with a plurality of light guide dots.

[0012] In a second aspect, the present disclosure provides a backlight module, comprising a plurality of light emitting elements and the light guide structure according to any one of the above embodiments, the plurality of light emitting elements are arranged on one side of the light guide structure, and each light guide plate and at least one light emitting element are arranged correspondingly.

[0013] In some embodiments, the light guide plate comprises a light guide plate body having a light exit surface and a back surface arranged oppositely, the back surface is provided with a light entrance hole, and the light emitting element is embedded in the light entrance hole.

[0014] In some embodiments, the backlight module further comprises a reflective sheet and a substrate, the light guide plate body, the reflective sheet and the substrate are laminated in sequence, the plurality of light emitting elements are arranged on the substrate respectively, and the light emitting element is embedded in the light entrance hole after passing through the reflective sheet.

[0015] In a third aspect, the present disclosure provides a display device comprising the backlight module according to any one of the above embodiments. Advantages

[0016] The present disclosure forms a light guide structure with a required shape / size by arranging a plurality of light guide plates and bonding and fixing adjacent light guide plates by using a reflective adhesive layer. When the light guide structure is applied to a direct type backlight display, the plurality of light guide plates and different light emitting partitions of the backlight source can be arranged correspondingly. In the process of partitioned light emission, the reflective adhesive layer prevents light transmission and escape into adjacent light guide plates, avoids light leakage in the target display partition, and further avoids light halo in the black area adjacent to the target display partition. Thus, the light halo problem of the direct type backlight display is eliminated or at least greatly reduced, thereby effectively improving the partitioned light control display effect and display quality of the direct type backlight display. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort.

[0018] FIG. 1 is a cross-sectional structure diagram of a light guide structure according to some embodiments of the present disclosure;

[0019] FIG. 2 is a partial enlarged structure diagram of the light guide structure in FIG. 1;

[0020] FIG. 3 is a projection structure diagram of a light guide structure according to some embodiments of the present disclosure;

[0021] FIG. 4 is a partial cross-sectional structure diagram of a backlight module according to some embodiments of the present disclosure;

[0022] FIG. 5 is a sectional structure diagram of a display device provided by some embodiments of the present disclosure.

[0023] Main element symbol explanation: 1 - light guide structure, 10 - light guide plate, 11 - light guide plate body, 111 - light exit surface, 112 - back surface, 113 - light entrance hole, 1131 - bottom wall, 1132 - side wall, 12 - reflection layer, 13 - light guide dots, 20 - reflective adhesive layer, 2 - light emitting element, 3 - reflective sheet, 4 - substrate, 5 - optical film, 6 - back plate, 200 - display panel. Embodiments of the present application

[0024] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present disclosure.

[0025] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0026] "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0027] The use of "adapted for" or "configured for" in the present disclosure means open and inclusive language that does not exclude devices adapted for or configured to perform additional tasks or steps. In addition, the use of "based on" means open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values can be based on additional conditions or values beyond those stated in practice.

[0028] In the present disclosure, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the disclosure. Details are set forth in the following description for purpose of explanation. It should be appreciated that one of ordinary skill in the art will readily recognize that the disclosure can be practiced without the use of these specific details. In other instances, well-known structures and processes have not been described in detail in order to avoid obscuring the description of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed.

[0029] In the related art, when the direct type backlight display product is performing the display with partitioned light control, the light crosstalk between the adjacent display partitions is prone to be obvious; the target partition is prone to leak light into the adjacent black area when displaying, and the adjacent black area is prone to have obvious light halo, which leads to a significant reduction in display quality.

[0030] As shown in FIG. 1, in a first aspect, the embodiments of the present application provide a light guide structure 1, which can be applied to a direct type backlight display product, and can eliminate or at least greatly reduce the light halo problem of the display product, and effectively improve the display effect and display quality of the display product with partitioned light control.

[0031] The light guide structure 1 includes a plurality of light guide plates 10, which are arrayed and sequentially spliced, and two adjacent light guide plates 10 are fixed by a reflective adhesive layer 20. The reflective adhesive layer 20 has high reflectivity to light of a preset waveband, for example, can be made of an adhesive with reflectivity to light of the preset waveband greater than or equal to 90%, for realizing the bonding and fixing between the two adjacent light guide plates 10, and can reflect the light overflowing from the light guide plate 10 back into the light guide plate 10. The specific brand of the adhesive used by the reflective adhesive layer 20 can be determined according to actual needs, and the embodiments of the present application do not limit this; for example, the reflective adhesive layer 20 can be made of HT03M optical adhesive. In this way, after the plurality of light guide plates 10 are bonded by the reflective adhesive layer 20, the whole plate structure with the required shape / size is formed by splicing. After the plurality of light guide plates 10 are bonded by the reflective adhesive layer 20, the interval between the adjacent light guide plates 10 is the reflective adhesive layer 20; since the thickness of the reflective adhesive layer 20 is relatively narrow, the interval between the adjacent light guide plates 10 is small and not easy to be observed, so that a relatively obvious splicing dark part is not formed, and the display visual effect of the light guide structure 1 and the backlight module is not obviously affected.

[0032] In the application of the light guide structure 1 to the direct type backlight display, different light emitting partitions of the backlight source can be correspondingly provided with different light guide plates 10, so that each light guide plate 10 is provided with at least one light emitting element 2, and the area where each light guide plate 10 is located can be regarded as a display partition. When the corresponding light emitting partition emits light, the light emitted by the light emitting partition can be incident into the corresponding light guide plate 10, and then the light is diffused by the light guide plate 10 and then emitted and displayed. When part of the light is diffused laterally along the light guide plate 10 and irradiated onto the reflective adhesive layer 20, the reflective adhesive layer 20 can reflect the part of the light back into the original light guide plate 10, so that the light cannot be transmitted to escape into the adjacent light guide plate 10 through the reflective adhesive layer 20, but can only be emitted and displayed in the target display partition through the original light guide plate 10. Thus, the light leakage phenomenon in the target display partition is avoided, and the halo phenomenon in the black area adjacent to the target display partition due to light leakage is eliminated or at least greatly reduced, thereby effectively improving the partition light control display effect and display quality of the direct type backlight display.

[0033] The characteristics of the reflective adhesive layer 20 can be determined according to actual needs, which are not limited in the embodiments of the present application. In some embodiments, the reflective adhesive layer 20 can be a milky white or white adhesive layer. The milky white or white adhesive layer has a high reflectivity to light, which can effectively reflect the light irradiated thereon and avoid the transmission of the light through the reflective adhesive layer 20. In addition, the milky white or white appearance can make the reflective adhesive layer 20 better match the color of the light emitted and displayed by the light guide plate 10.

[0034] The structure of the light guide plate 10 can be determined according to actual needs, which is not limited in the embodiments of the present application. As shown in FIGS. 1 to 3, in some embodiments, the light guide plate 10 can include light guide plate bodies 11, which are bonded and fixed by the reflective adhesive layer 20 between adjacent light guide plate bodies 11. The light guide plate body 11 has oppositely arranged light emitting surfaces 111 and back surfaces 112, which are opposite two side surfaces of the light guide plate body 11 along the thickness direction thereof. When the light guide structure 1 is applied to the direct type backlight display, the back surface 112 and the light emitting surface 111 of the light guide plate body 11 can be arranged in sequence along the light emitting and displaying direction of the direct type backlight display, and the light emitting surface 111 is arranged towards the viewing side where the user is located, while the back surface 112 is arranged away from the viewing side where the user is located. When a plurality of light guide plates 10 are sequentially spliced, the back surfaces 112 of any two light guide plates 10 can be coplanarly arranged.

[0035] Here, the back side 112 can be provided with a light inlet hole 113. The light inlet hole 113 is adapted to accommodate at least one light emitting element 2, and the light emitted by the light emitting element 2 can enter the light guide plate 10 through the light inlet hole 113. The number of light inlet holes 113 provided on each light guide plate 10 can be determined according to actual needs, and can be one or more, which is not limited in the embodiments of the present application. When a plurality of light inlet holes 113 are provided on the back side 112 of the light guide plate 10, the plurality of light inlet holes 113 can be arranged at intervals.

[0036] In some examples, the light guide plate 10 can further include a reflective layer 12. Here, the light inlet hole 113 can have a bottom wall 1131 and a side wall 1132, and the reflective layer 12 can cover the bottom wall 1131 of the light inlet hole 113 but not the side wall 1132 of the light inlet hole 113. The reflective layer 12 has a high reflectivity to light of a predetermined wavelength band, for example, can be made of a material having a reflectivity to light of the predetermined wavelength band greater than or equal to 90%, which is not limited in the embodiments of the present application. The forming method of the reflective layer 12 can be determined according to actual needs, for example, can be made by material deposition, spraying, etc., which is not limited in the embodiments of the present application.

[0037] When the light emitting element 2 corresponding to the light inlet hole 113 emits light, part of the light emitted by the light emitting element 2 can directly irradiate on the side wall 1132 of the light inlet hole 113 and enter the light guide plate 10 through the side wall 1132; another part of the light emitted by the light emitting element 2 can irradiate towards the bottom wall 1131 of the light inlet hole 113, and when irradiating on the reflective layer 12, the light is reflected by the reflective layer 12 to the side wall 1132 of the light inlet hole 113 and enters the light guide plate 10 through the side wall 1132. In this way, all or most of the light emitted by the light emitting element 2 uniformly enters the light guide plate 10 from the side wall 1132 of the light inlet hole 113, and then spreads laterally to each region in the light guide plate 10, avoiding the formation of a more obvious bright spot in the middle region of the light inlet hole 113, so that the brightness of different regions on the light guide plate 10 is more consistent and a more uniform homogenized light spot is formed.

[0038] The shape of the bottom wall 1131 of the light inlet hole 113 can be determined according to actual needs, and can be configured in a shape such as a semispherical shape, a conical shape, etc. The present application does not limit this. For example, the bottom wall 1131 of the light inlet hole 113 can have a conical configuration that extends and protrudes towards the opening of the light inlet hole 113. Correspondingly, one end of the conical configuration close to the opening of the light inlet hole 113 forms a vertex, and the other end of the conical configuration away from the opening of the light inlet hole 113 forms a bottom, and the bottom of the conical configuration is connected with the side wall 1132 of the light inlet hole 113. In this way, the reflective layer 12 arranged on the bottom wall 1131 of the light inlet hole 113 is distributed in a conical surface, and the reflective layer 12 in the conical surface can be more uniformly directed to different regions of the side wall 1132 of the light inlet hole 113. When light is irradiated onto the reflective layer 12, the reflective layer 12 can reflect the light more uniformly to different regions on the side wall 1132 of the light inlet hole 113, so that the light energy entering the light guide plate body 11 from different regions is more close, and the uniform light guiding effect of the light guide plate 10 and the brightness uniformity of the formed uniform light spot are better ensured.

[0039] In some embodiments, the light guide plate 10 can include the light guide plate body 11 described above, and a plurality of light guide dots 13 can be arranged on the light exit surface 111 of the light guide plate body 11. The light guide dots 13 can scatter the light irradiated thereon at different angles, destroy the total reflection in the light guide plate 10, and enable the light to exit from the light exit surface 111 of the light guide plate 10.

[0040] As shown in FIGS. 1 to 5, in a second aspect, the present application provides a backlight module including a plurality of light emitting elements 2 and the light guide structure 1 provided by any one of the above embodiments. Here, the plurality of light emitting elements 2 are arranged in an array on one side of the light guide structure 1, and each light guide plate 10 is arranged in correspondence with at least one light emitting element 2. Here, the backlight module can be a direct type backlight module. The backlight module provided by the present application has the light guide structure 1 described above, and when the backlight module is applied to a direct type backlight display product, the halo problem of such display product is eliminated or at least greatly reduced, and the partition light control display effect and display quality of such display product are effectively improved.

[0041] In some embodiments, the light guide plate 10 can include the light guide plate body 11 described above, and the light guide plate body 11 has an opposite light exit surface 111 and back surface 112, and the back surface 112 is provided with a light inlet hole 113. Here, the light emitting element 2 can be embedded in the light inlet hole 113. When there is only one light inlet hole 113 on the light guide plate body 11, one or more light emitting elements 2 can be arranged in the light inlet hole 113; when there are a plurality of light inlet holes 113 on the light guide plate body 11, one or more light emitting elements 2 can be arranged in at least one light inlet hole 113.

[0042] In some examples, the backlight module can further include a reflective sheet 3 and a substrate 4, and the light guide plate body 11, the reflective sheet 3 and the substrate 4 are sequentially laminated and attached. For example, the light guide plate body 11 and the reflective sheet 3, and the reflective sheet 3 and the substrate 4 can be attached by an adhesive layer, respectively. The plurality of light emitting elements 2 are arranged on the substrate 4, so that the plurality of light emitting elements 2 and the substrate 4 form a light emitting lamp plate structure. The type of the substrate 4 can be determined according to actual needs, which can be a hard printed circuit board, a flexible circuit board, etc., and the present application is not limited thereto.

[0043] Here, the reflective sheet 3 can be provided with a plurality of hollow parts, the hollow parts penetrate the reflective sheet 3 along the thickness direction of the reflective sheet 3, and the light emitting elements 2 are embedded in the light entrance hole 113 after penetrating the hollow parts of the reflective sheet 3. For example, the plurality of hollow parts can be equal in number to the plurality of light emitting elements 2, and are arranged one by one in a one-to-one correspondence, and each hollow part is adapted to penetrate one light emitting element 2. For another example, the plurality of hollow parts can be equal in number to the light entrance holes 113 on the light guide structure 1, and are arranged one by one in a one-to-one correspondence, and each hollow part is adapted to penetrate at least one light emitting element 2.

[0044] By sequentially laminating and attaching the light guide plate body 11, the reflective sheet 3 and the substrate 4 as described above, connecting the plurality of light emitting elements 2 and the substrate 4 to form a light emitting lamp plate structure, and embedding the light emitting elements 2 in the light entrance hole 113 after penetrating the reflective sheet 3, the light guide structure 1, the reflective sheet 3 and the light emitting lamp plate structure form a combined assembly, which simplifies the assembly process of the backlight module and improves the consistency of the assembly quality.

[0045] In some examples, the backlight module can further include an optical film 5, and the optical film 5 is arranged on the side surface of the light guide structure 1 away from the light emitting elements 2, and is used for optical conditioning of the light emitted from the light guide structure 1.

[0046] In some examples, the backlight module can further include a back plate 6, and the light guide structure 1 can be arranged on the back plate 6. When the backlight module includes the reflective sheet 3, the substrate 4 and the optical film 5, the optical film 5, the light guide structure 1, the reflective sheet 3 and the substrate 4 are sequentially laminated and arranged on the back plate 6, and the substrate 4 and the back plate 6 are connected and fixed.

[0047] In a third aspect, the present application provides a display device, which includes the backlight module of any one of the above embodiments. The purpose of the display device can be determined according to actual needs, which can be a complete machine or a display function module with display function, such as a television, a display, a mobile terminal, etc., and the present application is not limited thereto. The display device provided by the present application has the above-mentioned backlight module, which can eliminate or at least greatly reduce the halo problem, effectively improve the display effect and display quality of the partitioned light control.

[0048] In some embodiments, the display device can further include a display panel 200 disposed on the light exit side of the backlight module.

[0049] The light guide structure, the backlight module and the display device provided by the embodiments of the present disclosure are described in detail above, and the principles and implementation manners of the present disclosure are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present disclosure and its core idea; meanwhile, for those skilled in the art, according to the idea of the present disclosure, the specific implementation manners and application ranges will be changed, and the above description should not be understood as a limitation of the present disclosure.

Claims

1. A light guide structure comprising a plurality of light guide plates, the plurality of light guide plates being arranged and sequentially spliced, and two adjacent light guide plates being bonded and fixed by a reflective adhesive layer.

2. The light guide structure of claim 1, wherein, The reflective adhesive layer is a milky white or white adhesive layer.

3. The light guide structure of claim 1, wherein, The light guide plate comprises a light guide plate body having an opposite light emitting surface and back surface, and the back surface is provided with a light inlet hole.

4. The light guide structure of claim 3, wherein, The light guide plate further comprises a reflective layer covering the bottom wall of the light inlet hole.

5. The light guide structure of claim 4, wherein, The bottom wall of the light inlet hole has a tapered structure extending and protruding towards the opening of the light inlet hole.

6. The light guide structure of claim 3, wherein, The light inlet hole is adapted to accommodate at least one light emitting element.

7. The light guide structure of claim 3, wherein, The back surface is provided with a plurality of light inlet holes which are arranged at intervals.

8. The light guide structure of claim 3, wherein, The back surfaces of any two light guide plates are coplanar.

9. The light guide structure of claim 1, wherein, The light guide plate comprises a light guide plate body having an opposite light emitting surface and back surface, and the light emitting surface is provided with a plurality of light guide dots.

10. A backlight module comprising a plurality of light emitting elements and the light guide structure according to any one of claims 1 to 9, the plurality of light emitting elements being arranged on one side of the light guide structure, and each light guide plate and at least one light emitting element being correspondingly arranged.

11. The backlight module of claim 10, wherein, The light guide plate comprises a light guide plate body having an opposite light emitting surface and back surface, and the back surface is provided with a light inlet hole, and the light emitting element is embedded in the light inlet hole.

12. The backlight module of claim 11, wherein, The backlight module further comprises a reflective sheet and a substrate, and the light guide plate body, the reflective sheet and the substrate are sequentially laminated and bonded, the plurality of light emitting elements are arranged on the substrate respectively, and the light emitting elements are embedded in the light inlet hole after passing through the reflective sheet.

13. The backlight module of claim 12, wherein, The reflective sheet is provided with a plurality of hollow parts which penetrate the reflective sheet along the thickness direction of the reflective sheet, and the light emitting elements are embedded in the light inlet hole after passing through the hollow parts.

14. The backlight module of claim 13, wherein, The number of the plurality of hollow parts and the plurality of light emitting elements is equal, and they are arranged one by one in correspondence, and each hollow part is adapted to pass through one light emitting element.

15. The backlight module of claim 13, wherein, The number of the plurality of hollow parts and the light inlet holes on the light guide structure is equal, and they are arranged one by one in correspondence, and each hollow part is adapted to pass through one light emitting element.

16. The backlight module of claim 12, wherein, The backlight module further comprises an optical film and a back plate, and the optical film, the light guide structure, the reflective sheet and the substrate are sequentially laminated on the back plate, and the substrate and the back plate are connected and fixed.

17. The backlight module of claim 10, wherein, The backlight module further comprises an optical film, and the optical film is arranged on the side surface of the light guide structure away from the light emitting element.

18. The backlight module of claim 10, wherein, The backlight module further comprises a back plate, and the light guide structure is arranged on the back plate.

19. A display device comprising the backlight module according to any one of claims 10 to 18.

20. The display device of claim 19, wherein, The display device further comprises a display panel arranged on the light emitting side of the backlight module.

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