Light guide structure, backlight module and display device

Abstract

The embodiment of the utility model provides a light guide structure, a backlight module and a display device, the light guide structure comprises a plurality of light guide plates, the light guide plates are arranged in an array and spliced in sequence, and every two adjacent light guide plates are bonded and fixed through a reflective adhesive layer.

Description

Technical Field

[0001] The present application relates to the field of optoelectronic display technology, and in particular to a light guide structure, a backlight module and a display device. Background Art

[0002] Direct-type backlit display products place the dot matrix formed by the light-emitting device behind the screen, and the light-emitting dot matrix directly illuminates the screen for light display, thus enabling local light control. However, the local light control effect of direct-type backlit display products in related technologies is not ideal, and there is generally a relatively obvious halo problem, resulting in poor display quality. Utility Model Content

[0003] The embodiments of the present application provide a light guide structure, a backlight module and a display device, which can eliminate or at least reduce the halo problem to a large extent, and effectively improve the zone light control display effect and display quality.

[0004] In a first aspect, an embodiment of the present application provides a light guide structure, comprising a plurality of light guide plates, wherein the plurality of light guide plates are arranged in an array and spliced ​​in sequence, and two adjacent light guide plates are bonded and fixed by a reflective adhesive layer.

[0005] In some embodiments, the reflective adhesive layer is a milky white or white adhesive layer.

[0006] In some embodiments, the light guide plate includes a light guide plate body, the light guide plate body has a light emitting surface and a back side surface which are oppositely arranged, and a light incident hole is provided on the back side surface.

[0007] In some embodiments, the light guide plate further includes a reflective layer, and the reflective layer covers the bottom wall of the light incident hole.

[0008] In some embodiments, the bottom wall of the light incident hole has a tapered structure, and the tapered structure extends and protrudes toward the opening of the light incident hole.

[0009] In some embodiments, the light guide plate includes a light guide plate body, the light guide plate body has a light emitting surface and a back side surface that are oppositely arranged, and a plurality of light guide dots are arranged on the light emitting surface.

[0010] In a second aspect, an embodiment of the present application provides a backlight module, comprising a plurality of light-emitting elements and a light guide structure as described in any of the above embodiments, wherein the plurality of light-emitting element arrays 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.

[0011] In some embodiments, the light guide plate includes a light guide plate body having a light emitting surface and a back side surface that are oppositely disposed, a light incident hole is disposed on the back side surface, and the light emitting element is embedded in the light incident hole.

[0012] In some embodiments, the backlight module also includes a reflective sheet and a base substrate, the light guide plate body, the reflective sheet and the base substrate are stacked and bonded in sequence, the multiple light-emitting elements are respectively arranged on the base substrate, and the light-emitting elements pass through the reflective sheet and are embedded in the light entrance hole.

[0013] In a third aspect, an embodiment of the present application provides a display device, comprising the backlight module described in any of the above embodiments.

[0014] In the embodiment of the present application, a plurality of light guide plates are arranged, and adjacent light guide plates are bonded and fixed with a reflective adhesive layer to form a light guide structure of a desired shape / size. When the light guide structure is applied to a direct-type backlight display, a plurality of light guide plates and different light-emitting partitions of the backlight source can be arranged accordingly. In the process of partitioned light emission, the reflective adhesive layer is used to prevent light from transmitting and escaping to the adjacent light guide plate, thereby avoiding light leakage in the target display partition, and further avoiding the appearance of halo in the black area adjacent to the target display partition, thereby eliminating or at least greatly reducing the halo problem of the direct-type backlight display, thereby effectively improving the partitioned light control display effect and display quality of the direct-type backlight display. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a cross-sectional structural diagram of a light guide structure provided in some embodiments of the present application;

[0017] Figure 2 yes Figure 1 A partial enlarged structural diagram of the light guide structure in the middle;

[0018] Figure 3 is a projection structure diagram of a light guide structure provided in some embodiments of the present application;

[0019] Figure 4 is a partial cross-sectional structural diagram of a backlight module provided in some embodiments of the present application;

[0020] Figure 5 It is a cross-sectional structural diagram of a display device provided in some embodiments of the present application.

[0021] Description of main component symbols:

[0022] 1-light guide structure, 10-light guide plate, 11-light guide plate body, 111-light emitting surface, 112-back side surface, 113-light entrance hole, 1131-bottom wall, 1132-side wall, 12-reflective layer, 13-light guide grid, 20-reflective adhesive layer, 2-light emitting element, 3-reflective sheet, 4-base substrate, 5-optical film, 6-back plate, 200-display panel. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used 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" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0026] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be 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 the stated values ​​in practice.

[0027] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0028] In the related art, when direct-type backlight display products are performing zoned light control display, obvious light crosstalk is likely to occur between adjacent display zones; when the target zone is lit up for display, light is likely to leak into the adjacent black area, causing a more obvious halo to appear in the adjacent black area, resulting in a significant reduction in display quality.

[0029] like Figure 1 As shown, in the first aspect, the embodiment of the present application provides a light-guiding structure 1, which can be applied to direct-type backlight display products to eliminate or at least reduce to a large extent the halo problem of such display products, and effectively improve the zoned light control display effect and display quality of such display products.

[0030] The light guide structure 1 includes a plurality of light guide plates 10, which are arranged in an array and spliced ​​in sequence, and two adjacent light guide plates 10 are bonded and fixed by a reflective adhesive layer 20. The reflective adhesive layer 20 has a high reflectivity for light in a preset wavelength band, for example, it can be made of an adhesive with a reflectivity of 90% or more for light in a preset wavelength band, and is used to achieve bonding and fixing between 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 in the reflective adhesive layer 20 can be determined according to actual needs, and the embodiment of the present application does 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, they are spliced ​​to form a whole plate structure of the required shape / size. After multiple light guide plates 10 are bonded together by the reflective adhesive layer 20, the spacing between adjacent light guide plates 10 is the reflective adhesive layer 20; since the thickness of the reflective adhesive layer 20 is relatively narrow, the spacing between adjacent light guide plates 10 is relatively small and not easily observed, and no obvious splicing dark part is formed, thereby avoiding obvious influence on the display visual effects of the light guide structure 1 and the backlight module.

[0031] When the above-mentioned light guide structure 1 is applied to a direct backlight display, different light-emitting partitions of the backlight source can be set corresponding to different light guide plates 10, so that each light guide plate 10 is correspondingly 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 luminous partition emits light, the light it emits can be incident on the corresponding light guide plate 10, which will diffuse the light evenly and then display it. When part of the light is diffused laterally along the light guide plate 10 and irradiates 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 penetrate the reflective adhesive layer 20 to escape into the adjacent light guide plate 10, and can only be displayed in the target display partition through the original light guide plate 10, thereby avoiding light leakage in the target display partition, and further avoiding halo in the black area adjacent to the target display partition due to light leakage, eliminating or at least reducing the halo problem of direct-type backlight display to a large extent, thereby effectively improving the partitioned light control display effect and display quality of the direct-type backlight display.

[0032] The characteristics of the reflective adhesive layer 20 can be determined according to actual needs, and the embodiments of the present application are not limited thereto. 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, and can effectively reflect the light irradiated thereon, preventing the light from escaping through the reflective adhesive layer 20. In addition, the milky white or white appearance can make the reflective adhesive layer 20 better match the light output display color of the light guide plate 10.

[0033] The structure of the light guide plate 10 can be determined according to actual needs, and the present embodiment of the application does not limit this. Figures 1 to 3 As shown, in some embodiments, the light guide plate 10 may include a light guide plate body 11, and adjacent light guide plate bodies 11 are bonded and fixed by a reflective adhesive layer 20. The light guide plate body 11 has a light emitting surface 111 and a back side surface 112 that are arranged opposite to each other, and the light emitting surface 111 and the back side surface 112 are two opposite side surfaces on the light guide plate body 11 along its thickness direction. When the light guide structure 1 is applied to a direct-type backlight display, the back side surface 112 and the light emitting surface 111 of the light guide plate body 11 can be arranged in sequence along the light emitting display direction of the direct-type backlight display, and the light emitting surface 111 is arranged toward the viewing side where the user is located, and the back side surface 112 is arranged away from the viewing side where the user is located. When multiple light guide plates 10 are spliced ​​in sequence, the back side surfaces 112 of any two light guide plates 10 can be arranged in the same plane.

[0034] Here, a light entrance hole 113 may be provided on the back side surface 112. The light entrance hole 113 is suitable for accommodating at least one light emitting element 2, and the light emitted by the light emitting element 2 can be incident into the light guide plate 10 through the light entrance hole 113. The number of light entrance 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 embodiment of the present application. When a plurality of light entrance holes 113 are provided on the back side surface 112 of the light guide plate 10, the plurality of light entrance holes 113 can be provided at intervals.

[0035] In some examples, the light guide plate 10 may further include a reflective layer 12. Here, the light entrance hole 113 may have a bottom wall 1131 and a side wall 1132, and the reflective layer 12 may cover the bottom wall 1131 of the light entrance hole 113, but not cover the side wall 1132 of the light entrance hole 113. The reflective layer 12 has a high reflectivity for light in a preset wavelength band, for example, it may be made of a material with a reflectivity of greater than or equal to 90% for light in a preset wavelength band, which is not limited in this embodiment of the present application. The molding method of the reflective layer 12 can be determined according to actual needs, and can be made by, for example, material deposition, spraying, etc., which is not limited in this embodiment of the present application.

[0036] When the light emitting element 2 corresponding to the light entrance hole 113 emits light, a portion of the light emitted by the light emitting element 2 can directly irradiate the side wall 1132 of the light entrance hole 113 and enter the light guide plate 10 through the side wall 1132; another portion of the light emitted by the light emitting element 2 can irradiate toward the bottom wall 1131 of the light entrance hole 113, and when irradiated on the reflective layer 12, it is reflected by the reflective layer 12 to the side wall 1132 of the light entrance hole 113 and enter 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 is uniformly incident on the light guide plate 10 from the side wall 1132 of the light entrance hole 113, and then diffused to various areas in the light guide plate 10 laterally, avoiding the formation of a relatively obvious bright spot in the middle area of ​​the light entrance hole 113, so that the brightness of different areas on the light guide plate 10 is relatively consistent and a relatively uniform homogenized light spot is formed.

[0037] The shape of the bottom wall 1131 of the light input hole 113 can be determined according to actual needs, and can be constructed in a hemispherical, conical or other shape, which is not limited in the embodiments of the present application. Exemplarily, the bottom wall 1131 of the light input hole 113 can have a conical structure, and the conical structure extends and protrudes toward the opening of the light input hole 113. Accordingly, the end of the conical structure close to the opening of the light input hole 113 forms a vertex, and the end of the conical structure away from the opening of the light input hole 113 forms a bottom, and the bottom of the conical structure is connected to the side wall 1132 of the light input hole 113. In this way, the reflective layer 12 covered on the bottom wall 1131 of the light entrance hole 113 is distributed in a cone, and the reflective layer 12 with a cone surface can be more evenly oriented toward different areas of the side wall 1132 of the light entrance hole 113; when light is irradiated onto the reflective layer 12, the reflective layer 12 can reflect the light more evenly to different areas on the side wall 1132 of the light entrance hole 113, so that the light energy entering the light guide plate body 11 from different areas is relatively close, thereby better ensuring the uniform light guiding effect of the light guide plate 10 and the brightness uniformity of the formed uniform light spot.

[0038] In some embodiments, the light guide plate 10 may include the light guide plate body 11, and a plurality of light guide grid points 13 may be provided on the light exit surface 111 of the light guide plate body 11. The light guide grid points 13 may scatter the light irradiated thereon at different angles, destroy the total reflection in the light guide plate 10, and allow the light to be emitted from the light exit surface 111 of the light guide plate 10.

[0039] like Figures 1 to 5 As shown, in the second aspect, an embodiment of the present application provides a backlight module, which includes a plurality of light-emitting elements 2 and a light guide structure 1 provided in any of the above embodiments. Here, a 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 corresponding to at least one light-emitting element 2. Here, the backlight module can be a direct-type backlight module. The backlight module provided in an embodiment of the present application has the above-mentioned light guide structure 1. When the backlight module is applied to a direct-type backlight display product, the halo problem of such display products is eliminated or at least greatly reduced, and the partitioned light control display effect and display quality of such display products are effectively improved.

[0040] In some embodiments, the light guide plate 10 may include the above-mentioned light guide plate body 11, the light guide plate body 11 having a light emitting surface 111 and a back side surface 112 arranged opposite to each other, and a light entrance hole 113 is arranged on the back side surface 112. Here, the light emitting element 2 may be embedded in the light entrance hole 113. When only one light entrance hole 113 is provided on the light guide plate body 11, one or more light emitting elements 2 may be arranged in the light entrance hole 113; when multiple light entrance holes 113 are provided on the light guide plate body 11, one or more light emitting elements 2 may be arranged in at least one light entrance hole 113.

[0041] In some examples, the backlight module may further include a reflective sheet 3 and a base substrate 4, and the light guide plate body 11, the reflective sheet 3 and the base substrate 4 are stacked and bonded in sequence. Exemplarily, the light guide plate body 11 and the reflective sheet 3, and the reflective sheet 3 and the base substrate 4 may be bonded and bonded by adhesive layers, respectively. A plurality of light-emitting elements 2 are respectively arranged on the base substrate 4, so that the plurality of light-emitting elements 2 and the base substrate 4 form a light-emitting lamp board structure; the type of the base substrate 4 may be determined according to actual needs, and may be a hard printed circuit board, a flexible circuit board, etc., which is not limited in the embodiments of the present application.

[0042] Here, the reflective sheet 3 may be provided with a plurality of hollow portions, which penetrate the reflective sheet 3 along the thickness direction of the reflective sheet 3, and the light-emitting element 2 is embedded in the light-entering hole 113 after passing through the hollow portions of the reflective sheet 3. Exemplarily, the number of the plurality of hollow portions may be equal to the number of the plurality of light-emitting elements 2, and they are arranged one-to-one, and each hollow portion is suitable for passing through one light-emitting element 2; and another exemplary, the number of the plurality of hollow portions may be equal to the number of the light-entering holes 113 on the light-guiding structure 1, and they are arranged one-to-one, and each hollow portion is suitable for passing through at least one light-emitting element 2.

[0043] By stacking and bonding the light guide plate body 11, the reflective sheet 3 and the base substrate 4 in sequence as described above, connecting a plurality of light emitting elements 2 and the base substrate 4 to form a light emitting lamp board structure, and embedding the light emitting element 2 into the light entrance hole 113 after passing through the reflective sheet 3, the light guide structure 1, the reflective sheet 3 and the light emitting lamp board structure can form a combined assembly, thereby simplifying the assembly process of the backlight module and improving the consistency of the assembly quality.

[0044] In some examples, the backlight module may further include an optical film 5 , which is disposed on a surface of the light guide structure 1 away from the light emitting element 2 , and is used to optically condition the light emitted from the light guide structure 1 .

[0045] In some examples, the backlight module may further include a back plate 6, and the light guide structure 1 may be disposed on the back plate 6. When the backlight module includes the above-mentioned reflective sheet 3, the base substrate 4 and the optical film 5, the optical film 5, the light guide structure 1, the reflective sheet 3 and the base substrate 4 are sequentially stacked on the back plate 6, and the base substrate 4 and the back plate 6 are connected and fixed.

[0046] In a third aspect, an embodiment of the present application provides a display device, which includes a backlight module of any of the above embodiments. The purpose of the display device can be determined according to actual needs, and can be used as a whole machine with a display function such as a television, a monitor, a mobile terminal, or a display function module therein, and the embodiment of the present application does not limit this. The display device provided in the embodiment of the present application has the above-mentioned backlight module, which can eliminate or at least greatly reduce the halo problem, and effectively improve the partition light control display effect and display quality.

[0047] In some embodiments, the display device may further include a display panel 200 , and the display panel 200 is disposed on the light emitting side of the backlight module.

[0048] The light-guiding structure, backlight module and display device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A light guide structure, characterized in that: It comprises a plurality of light guide plates, which are arranged in an array and spliced ​​in sequence, and two adjacent light guide plates are bonded and fixed by a reflective adhesive layer.

2. The light guide structure according to claim 1, characterized in that: The reflective adhesive layer is milky white or white.

3. The light guide structure according to claim 1, characterized in that: The light guide plate comprises a light guide plate body, wherein the light guide plate body has a light emitting surface and a back side surface which are arranged opposite to each other, and a light incident hole is arranged on the back side surface.

4. The light guide structure according to claim 3, characterized in that: The light guide plate further includes a reflective layer, and the reflective layer covers the bottom wall of the light incident hole.

5. The light guide structure according to claim 4, characterized in that: The bottom wall of the light incident hole has a tapered structure, and the tapered structure extends and protrudes toward the opening of the light incident hole.

6. The light guide structure according to claim 1, characterized in that: The light guide plate comprises a light guide plate body, wherein the light guide plate body has a light emitting surface and a back side surface which are arranged opposite to each other, and a plurality of light guide dots are arranged on the light emitting surface.

7. A backlight module, characterized in that: The invention comprises a plurality of light emitting elements and the light guide structure according to any one of claims 1 to 6, wherein the plurality of light emitting element arrays are arranged on one side of the light guide structure, and each light guide plate is arranged correspondingly to at least one light emitting element.

8. The backlight module according to claim 7, characterized in that: The light guide plate comprises a light guide plate body, wherein the light guide plate body has a light emitting surface and a back side surface which are arranged opposite to each other, a light entrance hole is arranged on the back side surface, and the light emitting element is embedded in the light entrance hole.

9. The backlight module according to claim 8, characterized in that: The backlight module also includes a reflective sheet and a base substrate. The light guide plate body, the reflective sheet and the base substrate are stacked and bonded in sequence. The multiple light-emitting elements are respectively arranged on the base substrate. The light-emitting elements pass through the reflective sheet and are embedded in the light entrance hole.

10. A display device, characterized in that: A backlight module comprising any one of claims 7 to 9.

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