A spectroscopic structure and a backlight module

Abstract

The present invention belongs to the field of display technology devices, and particularly relates to a light splitting structure and a backlight module. The light splitting structure is used to split light from a light source. The light source projects light towards the light splitting structure. The light splitting structure is made of a light-transmitting material and has a light incident surface arranged opposite to the light source and a light exit surface arranged away from the light source. The light incident surface is provided with a light incident hole for light to enter and for converging the light. The light exits the light splitting structure from the light exit surface. A plurality of light incident holes are arranged at intervals on the light incident surface. The present invention forms a plurality of densely arranged point light sources on the light splitting structure, improving the uniformity of light propagation.

Description

Technical Field

[0001] The present invention belongs to the field of display technology devices, and particularly relates to a light splitting structure and a backlight module. Background Art

[0002] The backlight module is one of the key components of a liquid crystal display panel, and its function is to supply sufficient brightness and a uniformly distributed light source so that the liquid crystal display panel can display images normally.

[0003] In the backlight module of a traditional conventional liquid crystal display, the entire backlight light enters from one side, and the LED light source is directly aligned with the side surface of the light guide plate.

[0004] However, due to the concentrated light incident points and strong light beams, and the limited light homogenization distance of the backlight module, the light beam distribution from the light source incident on the light guide plate is uneven, resulting in an easy occurrence of poor lamp shadow, that is, bright and dark alternating points, in the entire module subjectively, causing customer complaints and a decline in product competitiveness. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a light splitting structure, aiming to solve the problem of how to improve the uniformity of the light output of the light source.

[0006] To achieve the above purpose, the technical solution adopted by the present application is:

[0007] In a first aspect, a light splitting structure is provided for splitting the light source. The light source projects light towards the light splitting structure. The light splitting structure is made of a light-transmitting material and has a light incident surface arranged opposite to the light source and a light output surface arranged away from the light source. The light incident surface is provided with a light incident hole for the light to enter and for converging the light. The light exits the light splitting structure from the light output surface, and a plurality of the light incident holes are spaced apart on the light incident surface.

[0008] In some embodiments, the aperture of the light incident hole is gradually reduced along the incident direction of the light.

[0009] In some embodiments, the bottom of the light incident hole is recessed towards the inside of the light splitting structure to form a scattering concave arc surface, and the center of curvature of any point on the scattering concave arc surface is located inside the light incident hole.

[0010] In some embodiments, the light output surface is provided with light output holes, and a plurality of the light output holes are spaced apart on the light output surface. The aperture of the light output hole is gradually reduced along the direction away from the light exit direction.

[0011] In some embodiments, at the positions of the light incident surface facing each of the light output holes, a reflecting convex arc surface is convexly provided outward. The reflecting convex arc surface is used to reflect the light inside the light output structure to the corresponding light output hole.

[0012] In some embodiments, the light source includes a circuit board and lamp beads disposed on the circuit board, and a plurality of the lamp beads are spaced apart. Any one of the light-emitting holes is located between two adjacent lamp beads in a direction perpendicular to the board surface of the circuit board, and each of the light-incident holes is disposed opposite to each of the lamp beads in a direction perpendicular to the board surface of the circuit board.

[0013] In some embodiments, the bottom of the light-emitting hole bulges towards the inside of the light-emitting hole to form a scattering convex arc surface, and the center of curvature of any point on the scattering convex arc surface is located within the light splitting structure.

[0014] In some embodiments, a first reflective layer is provided on the side wall of the light-emitting hole, and the first reflective layer is configured to reflect the light incident on the light-emitting hole in multiple directions.

[0015] In some embodiments, the light splitting structure includes a light splitting plate disposed opposite to the light source and a bottom plate for supporting the light splitting plate. The light-incident surface and the light-emitting surface are respectively located on two opposite side surfaces of the light splitting plate, and the side surface of the light splitting plate is connected to the bottom plate; a second reflective layer is provided on the surface of the bottom plate facing away from the light splitting plate.

[0016] In a second aspect, a backlight module is provided, which includes the light splitting structure. The backlight module further includes a back plate, a light guide plate, and the light source. The back plate has a receiving cavity, and both the light source and the light splitting structure are located in the receiving cavity. The light guide plate is laid flat in the receiving cavity, and a side surface of one end of the light guide plate is disposed opposite to each of the light-emitting holes; at least one side surface of the light guide plate is recessed inward to form a placement cavity, and the cavity wall of the placement cavity forms a reflective surface for reflecting light, and the reflective surface is configured to reflect the light located within the light guide plate.

[0017] The beneficial effects of the present application are as follows: The light splitting structure has a light-incident surface and a light-emitting surface. The light-incident surface is provided with a plurality of light-incident holes arranged at intervals. The light emitted by the light source is incident on the light splitting structure through the light-incident surface and exits the light splitting structure through the light-emitting surface, so that a plurality of point light sources densely arranged are formed on the light splitting structure, improving the uniformity of light propagation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic cross-sectional principle diagram of the backlight module provided by the embodiment of the present application;

[0020] Figure 2 It is a schematic cross-sectional principle diagram of a light splitting structure provided by another embodiment of the present application;

[0021] Figure 3 It is an exploded view of a backlight module provided by still another embodiment of the present application;

[0022] Figure 4 It is a three-dimensional structure schematic diagram of a light splitting structure provided by yet another embodiment of the present application;

[0023] Figure 5 It is Figure 4 a three-dimensional structure schematic diagram of the light splitting structure from another perspective;

[0024] Figure 6 It is Figure 5 a cross-sectional schematic diagram of the light splitting structure of

[0025] Figure 7 It is Figure 1 a partial cross-sectional schematic diagram of the light guide plate of

[0026] Among them, the reference numerals in the figure:

[0027] 100, backlight module; 10, light source; 11, circuit board; 12, lamp beads; 30, light splitting structure; 31, light splitting plate; 32, bottom plate; 40, light guide plate; 41, film; 42, reflective paper; 20, back plate; 21, accommodating cavity; 311, light incident hole; 3111, scattering concave arc surface; 312, light exit hole; 3121, scattering convex arc surface; 313, light incident surface; 314, light exit surface; 33, bonding layer; 401, placement cavity; 402, reflective surface; 3131, reflective convex arc surface; Specific Embodiments

[0028] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0029] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "first" and "second" are only for the purpose of convenient description, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0030] Please refer to Figures 1 to 3 , an embodiment of the present application provides a beam splitting structure 30, which is used for splitting the light source 10, and the light source 10 projects light towards the beam splitting structure 30.

[0031] Please refer to Figures 1 to 3 , the beam splitting structure 30 is made of a light-transmitting material. The beam splitting structure 30 is made of a light-transmitting material with relatively good light transmittance. Light can pass through the beam splitting structure 30, that is, light enters the beam splitting structure 30 from one side of the beam splitting structure 30 and exits the beam splitting structure 30 from the other side. The light-transmitting material can be optical glass or organic high polymer. Optical glass has the characteristics of good light transmittance and a large dispersion coefficient range, and good optical stability and wear resistance. The organic high polymer can be optical plastic, which refers to plastic used as an optical medium material. It has the characteristics of light weight, low cost, simple manufacturing process, and not easy to break. In this embodiment, the light-transmitting material is PC (Polycarbonate) plastic. In other embodiments, it can be selected according to actual situations, and no limitation is made here.

[0032] Please refer to Figures 1 to 3, the light splitting structure 30 has a light incident surface 313 arranged opposite to the light source 10 and a light exit surface 314 arranged away from the light source 10. The light incident surface 313 is provided with a light incident hole 311 for the light to enter and for converging the light. The light exit surface 314 is provided with a light exit hole 312 for the light to exit. It can be understood that part of the light emitted by the light source 10 enters the light incident hole 311 from the light incident surface 313. The hole wall of the light incident hole 311 reflects and refracts the light in multiple directions to evenly distribute the light. The light is conducted within the light splitting structure 30, and part of the light is then emitted from the light exit surface 314 out of the light splitting structure 30. A plurality of light incident holes 311 are arranged at intervals on the light incident surface 313. After part of the light of the light source 10 enters the light splitting structure 30 from the light incident surface 313, the light is evenly distributed by each light incident hole 311 and then exits the light splitting structure 30 from the light exit surface 314, so that each light incident hole 311 forms a plurality of point light sources arranged densely and at intervals, making the single light source 10 into a plurality of densely arranged point light sources, thereby improving the uniformity of the light propagation.

[0033] Please refer to Figures 1 to 3 , the light splitting structure 30 provided in the embodiment of the present application has a light incident surface 313 and a light exit surface 314. The light incident surface 313 is provided with a plurality of light incident holes 311 arranged at intervals. The light emitted by the light source 10 enters the light splitting structure 30 through the light incident surface 313 and exits the light splitting structure 30 from the light exit surface 314, so that a plurality of densely arranged point light sources are formed on the light splitting structure 30, improving the uniformity of the light propagation.

[0034] Please refer to Figures 4 to 5 , optionally, the light incident holes 311 are arranged in columns and multiple columns are arranged at intervals. In this embodiment, each column of light incident holes 311 is provided with three light incident holes 311. In other embodiments, four or more can also be provided and selected according to actual situations, and no limitation is made here.

[0035] It can be understood that the light emitted from the light exit surface 314 has high uniformity, which is beneficial to reducing the bright and dark spots on the subsequent light guide plate 40.

[0036] Please refer to Figure 2 and Figure 6In some embodiments, the aperture of the light entrance hole 311 is tapered along the incident direction of the light. Optionally, the cross-sectional shape of the light entrance hole 311 may be circular, elliptical or polygonal. In the present embodiment, the cross-sectional shape of the light entrance hole 311 is circular, and the side wall of the light entrance hole 311 is a conical surface. The first angle between any generatrix on the side wall of the light entrance hole 311 and the first direction ranges from 15 to 30 degrees. The first direction refers to the direction of the plane determined by the aperture of the light entrance hole 311. Optionally, in the present embodiment, the first angle is 20 degrees. In other embodiments, it may also be 15 degrees or 30 degrees. The selection is made according to the actual situation and is not limited here.

[0037] See also Figure 2 and Figure 6 It can be understood that the shape of the light entrance hole 311 is trumpet-shaped, so that as much light as possible can be incident on the light entrance hole 311. The hole wall of the light entrance hole 311 gathers the incident light and reflects and refracts it in multiple directions, thereby improving the uniformity of the light entering the splitting structure 30.

[0038] See also Figure 2 and Figure 6 In some embodiments, the bottom of the light entrance hole 311 is recessed toward the light splitting structure 30 and forms a scattering concave arc surface 3111. In this embodiment, the scattering concave arc surface 3111 is hemispherical, and the center of curvature of any item on the scattering concave arc surface 3111 is located in the light entrance hole 311. The heat dissipation concave surface can not only make the light incident on the scattering concave arc surface 3111 in a straight line, but also make the scattering concave arc surface 3111 refract at multiple angles on the scattering concave arc surface 3111 and incident on the light splitting structure 30, thereby improving the uniformity of the incident light. In other embodiments, the shape of the scattering concave arc surface 3111 can be selected according to actual conditions, and is not limited here.

[0039] In some embodiments, the light emitting surface 314 is provided with a light emitting hole 312, and a plurality of light emitting holes 312 are disposed at intervals on the light emitting surface 314. Figures 4 to 5 Optionally, the light exit holes 312 are arranged in columns, and multiple columns are arranged at intervals. In this embodiment, each column of light exit holes 312 is provided with three light exit holes 312. In other embodiments, four or more light exit holes 312 may also be provided. The selection is made according to actual conditions and is not limited here.

[0040] In some embodiments, the aperture of the light exit hole 312 is gradually reduced along a direction away from the exit direction of the light.

[0041] See also Figure 2 and Figure 6, in some embodiments, the aperture of the light-emitting hole 312 is tapered along the light-emitting direction of the light. Optionally, the cross-sectional shape of the light-emitting hole 312 may be circular, elliptical or polygonal. In this embodiment, the cross-sectional shape of the light-emitting hole 312 is circular, and the hole side wall of the light-emitting hole 312 is a conical surface. The range of the second included angle between any generatrix on the hole side wall of the light-emitting hole 312 and the second direction is 15 to 30 degrees. The second direction refers to the direction perpendicular to the plane determined by the orifice of the light-emitting hole 312. Optionally, in this embodiment, the second included angle is 20 degrees. In other embodiments, it may also be 15 degrees or 30 degrees, which can be selected according to the actual situation and is not limited here.

[0042] Please refer to Figure 2 and Figure 6 , in some embodiments, at the positions where the light-incident surface 313 faces each of the light-emitting holes 312, a reflecting convex arc surface 3131 is convexly provided outward. The reflecting convex arc surface 3131 is used to reflect the light in the light-emitting structure 30 to the corresponding light-emitting hole 312, so as to increase the light intensity in the light-emitting hole 312.

[0043] Optionally, the center of curvature of any point on the reflecting convex arc surface 3131 is located within the light-splitting structure 30.

[0044] In some embodiments, the light source includes a circuit board and lamp beads arranged on the circuit board, and a plurality of the lamp beads are arranged at intervals. The lamp beads 12 may be LED lamp beads. Each of the lamp beads 12 is arranged in a column, and multiple columns are arranged at intervals along the length direction of the circuit board 11. Any one of the light-emitting holes 312 is located between two adjacent lamp beads 12 along the direction perpendicular to the board surface of the circuit board 11, that is, the projection of the plane determined by the orifice of the light-emitting hole 312 on one side surface of the circuit board 11 is located between two adjacent lamp beads 12.

[0045] It can be understood that the light intensity in the area between two adjacent lamp beads 12 on the circuit board 11 is relatively weak, and the light incident on the light-splitting structure 30 from this position is also relatively small. By arranging the light-emitting holes 312 between the two lamp beads 12, the light intensity at the corresponding position on the light-splitting structure 30 is enhanced, so that the light emission of the light-splitting structure 30 is uniform, and the light-emitting surface 314 forms a surface light source 10.

[0046] Optionally, each of the light incident holes 311 is disposed opposite to each of the lamp beads 12 along the direction perpendicular to the board surface of the circuit board 11, that is, each light exit hole corresponds to each lamp bead. The light intensity in the area of the lamp bead 12 is relatively high, and more light rays in the area of the lamp bead 12 are incident on the light splitting structure. After part of the light rays enter the light incident holes 311, they are refracted to other positions inside the light splitting structure 30, for example, refracted onto the reflecting convex arc surface 3131 and reflected by the reflecting convex arc surface 3131 into the light exit hole 312, thereby reducing the light intensity at the light incident holes on the light splitting structure 30 and increasing the light intensity at the light exit hole 312 of the light splitting structure 30, playing a role of "peaking and valley filling", making the light exit surface 314 a surface light source with uniform light distribution and avoiding bright and dark alternating points subsequently.

[0047] It can be understood that the projection of the reflecting convex arc surface 3131 on the circuit board 11 overlaps with the projection of the plane determined by the orifice of the light exit hole 312 on the circuit board 11 and covers the gap area with relatively weak light intensity between the two lamp beads 12, so that the brightness and light intensity at each position on the light exit surface 314 are kept uniform.

[0048] Please refer to Figure 2 and Figure 6 In some embodiments, the bottom of the light exit hole 312 bulges towards the inside of the light exit hole 312 to form a scattering convex arc surface 3121. The center of curvature of any point on the scattering convex arc surface 3121 is located inside the light splitting structure 30. Optionally, in this embodiment, the shape of the scattering convex arc surface 3121 is also hemispherical. By providing the scattering convex arc surface 3121 at the bottom of the light exit hole 312, the light can be reflected at multiple angles and concentratedly emitted, enhancing the light emission brightness of each light exit hole 312, enabling uniform splitting of the light rays emitted from the light source 10, and improving the uniformity of light distribution and propagation.

[0049] In some embodiments, a first reflective layer is provided on the side wall of the light exit hole 312, and the first reflective layer is used to reflect the light rays incident on the light exit hole 312 in multiple directions.

[0050] Optionally, the first reflective layer can reflect the light rays at multiple angles, enabling the light rays to be concentratedly emitted from the light exit hole 312 and increasing the light emission brightness of the light exit hole 312.

[0051] Optionally, the thickness range of the first reflective layer is 0.01 - 0.03 mm, and the first reflective layer is made of a white reflective material, where the white reflective material can be barium sulfate.

[0052] In some embodiments, the beam splitting structure 30 includes a beam splitting plate 31 disposed opposite the light source 10 and a bottom plate 32 for supporting the beam splitting plate 31. The light incident surface 313 and the light exit surface 314 are respectively located on two side surfaces of the beam splitting plate 31, and a side surface of the beam splitting plate 31 is connected to the bottom plate 32. The bottom plate 32 can connect the beam splitting plate 31 to other structural members, and the bottom plate 32 can be screwed to other structural members by means of screwing.

[0053] In some embodiments, a second reflective layer is disposed on a surface of the bottom plate 32 facing away from the beam splitting plate 31. The thickness range of the second reflective layer is 0.01 - 0.03 mm, and the second reflective layer is made of a white reflective material, where the white reflective material may be barium sulfate. The second reflective layer can make the light emit from the light exit surface 314 as much as possible, thereby increasing the intensity of the light in a predetermined direction.

[0054] Please refer to Figure 1 and Figure 3 The present invention also provides a backlight module 100. The backlight module 100 includes a beam splitting structure 30. The specific structure of the beam splitting structure 30 refers to the above embodiments. Since the backlight module 100 adopts all the technical solutions of the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0055] Please refer to Figure 1 and Figure 3 In some embodiments, the backlight module 100 further includes a back plate 20, a light guide plate 40, and the light source 10. The back plate 20 has a receiving cavity 21. The light source 10 and the beam splitting structure 30 are both located in the receiving cavity 21. The light guide plate 40 is laid flat in the receiving cavity 21, and a side surface at one end of the light guide plate 40 is disposed opposite to each of the light exit holes 312.

[0056] Optionally, the light source 10 is an LED light source. In other embodiments, the light source 10 may also be other forms of light sources 10, which are not limited herein and can be selected according to actual situations.

[0057] Please refer to Figure 7 In some embodiments, at least one side surface of the light guide plate 40 is recessed inward to form a placement cavity 401. A cavity wall of the placement cavity 401 forms a reflective surface 402 for reflecting light. The reflective surface 402 is used to reflect the light located in the light guide plate 40 to increase the light transmittance in the light guide plate 40.

[0058] Optionally, the range of the third included angle between the plane determined by the cavity wall of the placement cavity 401 and the plane determined by the cavity bottom of the placement cavity 401 is 30 to 45 degrees. In this embodiment, the third included angle is 30 degrees. In other embodiments, the third included angle can also be 45 degrees, which is not limited here and can be selected according to actual situations.

[0059] Optionally, placement cavities 401 are formed on both side plates of the light guide plate 40. A diaphragm 41 and a reflective paper 42 are respectively arranged in the two placement cavities 401, and the reflective paper 42 is located between the back plate 20 and the light guide plate 40.

[0060] In some embodiments, the backlight module 100 further includes an adhesive layer 33. The adhesive layer 33 is disposed on the cavity bottom of the accommodating cavity 21, and the light splitting structure 30 is bonded to the adhesive layer 33. The adhesive layer 33 is a tape, and the bottom plate 32 can be detachably connected to the back plate 20 through the tape.

[0061] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A light splitting structure, used to split a light source, wherein the light source projects light toward the light splitting structure. It is characterized in that The light splitting structure is made of a light-transmitting material and has a light incident surface arranged opposite to the light source and a light exiting surface arranged opposite to the light source. The light incident surface is provided with a light incident hole for the light to enter and for collecting the light. The light exits the light splitting structure at the light exiting surface. A plurality of light incident holes are arranged at intervals on the light incident surface. The light emitting surface is provided with a light emitting hole, the aperture of the light emitting hole is gradually reduced along the emitting direction away from the light, and a plurality of light emitting holes are arranged at intervals on the light emitting surface; The position of the light incident surface facing each of the light exit holes is provided with a reflective convex arc surface protruding outward, and the reflective convex arc surface is used to reflect the light in the light exit structure to the corresponding light exit hole; A first light reflecting layer is disposed on the side wall of the light exit hole, and the first light reflecting layer is used to reflect the light incident on the light exit hole in multiple directions.

2. The light splitting structure according to claim 1, Features: The aperture of the light entrance hole is gradually reduced along the incident direction of the light.

3. The light splitting structure according to claim 1, Features: The bottom of the light entrance hole is recessed toward the light splitting structure to form a scattering concave arc surface, and the center of curvature of any point on the scattering concave arc surface is located in the light entrance hole.

4. The light splitting structure according to any one of claims 1 to 3, Features: The light source includes a circuit board and lamp beads arranged on the circuit board, and a plurality of the lamp beads are arranged at intervals, any light exit hole is located between two adjacent lamp beads along a direction perpendicular to the circuit board surface, and each light entrance hole is arranged opposite to each lamp bead along a direction perpendicular to the circuit board surface.

5. The light splitting structure according to any one of claims 1 to 3, Features: The bottom of the light exit hole bulges toward the inside of the light exit hole to form a scattering convex arc surface, and the center of curvature of any point on the scattering convex arc surface is located in the light splitting structure.

6. The light splitting structure according to any one of claims 1 to 3, Features: The light splitting structure includes a light splitting plate arranged relative to the light source and a bottom plate for supporting the light splitting plate, the light incident surface and the light emitting surface are respectively located on two side surfaces of the light splitting plate, and the side surface of the light splitting plate is connected to the bottom plate; the surface of the bottom plate facing away from the light splitting plate is provided with a second reflective layer.

7. A backlight module, It is characterized in that It includes the light-splitting structure as described in any one of claims 1 to 6, and the backlight module also includes a back panel, a light guide plate and the light source, the back panel has a receiving cavity, the light source and the light-splitting structure are both located in the receiving cavity, the light guide plate is flatly arranged in the receiving cavity, and the side surface of one end of the light guide plate is arranged relative to each of the light exit holes; at least one side surface of the light guide plate is recessed inwardly and forms a placement cavity, the cavity wall of the placement cavity forms a reflective surface for reflecting light, and the reflective surface is used to reflect the light located in the light guide plate.

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