Lens and backlight module

Abstract

The embodiment of the utility model provides a lens and a backlight module, the lens comprises a lens body, the lens body is provided with a first top wall, a second top wall and a circumferential side wall which are connected in sequence, the second top wall is arranged around the outer edge of the first top wall, the circumferential side wall is arranged around the outer edge of the second top wall, and the first top wall and the second top wall are connected in sequence. The first top wall, the second top wall and the circumferential side wall are enclosed to form a light inlet cavity; a reflecting layer is arranged on the surface of the second top wall, and the reflecting layer is configured to reflect part of light incident from the light incident cavity to the circumferential side wall.

Description

Technical Field

[0001] The present application relates to the technical field of lenses, and in particular to a lens and a backlight module. Background Art

[0002] In the related art, some backlight display devices choose to set a lens on the light-emitting chip, and use the lens to increase the light-emitting angle of the light-emitting chip, so as to expand the light spot and reduce the number of light-emitting chips used. However, the lens in the related art has defects such as high cost and poor light transmission and scattering effect, and cannot meet the use needs well. Utility Model Content

[0003] The embodiments of the present application provide a lens and a backlight module, which can reduce the manufacturing cost and improve the light transmission and scattering effect, and better meet the use requirements of backlight display.

[0004] On the one hand, an embodiment of the present application provides a lens, including a lens body, the lens body having a first top wall, a second top wall and a circumferential side wall connected in sequence, the second top wall is arranged around the outer edge of the first top wall, the circumferential side wall is arranged around the outer edge of the second top wall, the first top wall, the second top wall and the circumferential side wall together form a light entrance cavity; a reflective layer is provided on the surface of the second top wall, and the reflective layer is configured to reflect part of the light incident from the light entrance cavity to the circumferential side wall.

[0005] In some embodiments, the reflective layer is provided with a patterned hollow portion extending therethrough, and the patterned hollow portion extends to the surface of the second top wall.

[0006] In some embodiments, the patterned hollow portion includes a plurality of annular grooves that are sequentially spaced apart, and the plurality of annular grooves are respectively arranged around the first top wall.

[0007] In some embodiments, the reflective layer is disposed on a surface of the second top wall that is away from the light incident cavity.

[0008] In some embodiments, the first top wall is a curved thin wall that bulges in a direction away from the light incident cavity.

[0009] In some embodiments, the second top wall is recessed along a first direction at one end of the circumferential side wall, and an inner diameter of the second top wall gradually decreases along the first direction, wherein the first direction is a direction connecting opposite ends of the circumferential side wall.

[0010] In some embodiments, the lens body is made of acrylic material.

[0011] On the other hand, an embodiment of the present application provides a backlight module, comprising the lens and the light-emitting element described in any one of the above embodiments, wherein the light-emitting element is embedded in the light incident cavity.

[0012] In some embodiments, the backlight module further includes a back plate and a reflective sheet, the light emitting element and the reflective sheet are respectively arranged on the back plate, the reflective sheet is provided with an avoidance hole, and the light emitting element is arranged to pass through the avoidance hole.

[0013] In some embodiments, the lens is disposed on the back plate through the avoidance hole, or the lens is disposed on a surface of the reflective sheet on one side away from the back plate.

[0014] The embodiment of the present application can significantly reduce the material usage and production cost by setting the lens as a thin-wall structure, and can effectively reduce the brightness loss of light when passing through the lens and increase the brightness of the transmission light spot. The lens is set to have top light output and circumferential light output to form a transmission light spot with a larger distribution range, effectively increase the light-emitting angle of the light-emitting element and homogenize and expand the light-emitting light spot; in this way, when the light-emitting element passes through the lens, a transmission light spot with higher brightness and uniformity can be formed, which better meets the use requirements of 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 lens provided in some embodiments of the present application;

[0017] Figure 2 is another cross-sectional structural diagram of a lens provided in some embodiments of the present application;

[0018] Figure 3 is a top view projection structure diagram of a lens 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 is another cross-sectional structural diagram of a lens provided in some embodiments of the present application;

[0021] Figure 6 is another top-view projection structure diagram of a lens provided in some embodiments of the present application;

[0022] Figure 7 This is another partial cross-sectional structural diagram of the backlight module provided in some embodiments of the present application.

[0023] Description of main component symbols:

[0024] 1-lens, 10-lens body, 11-first top wall, 12-second top wall, 13-circumferential side wall, 10a-light entrance cavity, 20-reflection layer, 21-patterned hollow portion, 211-annular groove, 2-light emitting element, 3-back plate, 4-reflection sheet. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0028] 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.

[0029] 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.

[0030] In the related art, due to the limitation of design structure, the amount of material required for the lens is large, resulting in a high cost of the lens, and the brightness loss of light when passing through the lens is large, resulting in a low brightness of the formed transmission light spot. In addition, the transmission light spot formed by the lens is small, and it cannot effectively homogenize and expand the light emitted by the light-emitting element, resulting in a limited uniform light scattering effect of the lens. The above defects result in the lens in the related art not being able to meet the use needs of backlight display.

[0031] like Figures 1 to 3 As shown, on the one hand, an embodiment of the present application provides a lens 1, which includes a lens body 10 and a reflective layer 20, which can reduce the manufacturing cost and improve the light transmission and scattering effect, and can form a transmission light spot with high brightness and uniformity, so as to better meet the use requirements of backlight display.

[0032] The lens body 10 is made of a light-transmitting material and has a light-transmitting property, which allows light to pass through it. The lens body 10 includes a first top wall 11, a second top wall 12 and a circumferential side wall 13, the second top wall 12 is arranged around the outer edge of the first top wall 11, and the circumferential side wall 13 is arranged around the outer edge of the second top wall 12, specifically, the edge of one side of the second top wall 12 away from the first top wall 11. The first top wall 11, the second top wall 12 and the circumferential side wall 13 are connected in sequence to enclose and form a light entrance cavity 10a. The above-mentioned reflective layer 20 is provided on the surface of the second top wall 12, and the reflective layer 20 is configured to reflect part of the light incident from the light entrance cavity 10a to the circumferential side wall 13, so that the part of the light is emitted from the circumferential side wall 13 to form circumferential light output. Here, the wall thickness of the first top wall 11, the second top wall 12 and the circumferential side wall 13 is relatively small to form a thin-wall structure. For example, it can be set to be smaller than the radius of the light incident cavity 10a, or even smaller than a fraction of the radius of the light incident cavity 10a. This embodiment of the present application is not limited to this.

[0033] like Figure 4As shown, when the lens 1 provided in the embodiment of the present application is used for backlight display, the light-emitting element 2 can be arranged in the light-entering cavity 10a of the lens 1, and a part of the light emitted by the light-emitting element 2 is directly irradiated onto the first top wall 11, and after being scattered by the first top wall 11, it is emitted to the side of the first top wall 11 away from the light-entering cavity 10a to form top-side light emission; and another part of the light emitted by the light-emitting element 2 is irradiated onto the second top wall 12, and is reflected by the reflective layer 20 located on the second top wall 12 to the circumferential side wall 13, and then emitted through the circumferential side wall 13 to form circumferential light emission. Combining the top-side light emission and the circumferential light emission can form a transmission light spot with a larger distribution range, effectively increasing the light-emitting angle of the light-emitting element 2 and homogenizing and expanding the light spot.

[0034] Compared with the related art, the lens 1 provided in the embodiment of the present application has a thin-wall structure on the one hand, which can significantly reduce the material usage and production cost, and can effectively reduce the brightness loss of light when passing through the lens 1 and increase the brightness of the transmission light spot. On the other hand, it can form a transmission light spot with a larger distribution range through top light output and circumferential light output, effectively increasing the light-emitting angle of the light-emitting element 2 and homogenizing and expanding the light-emitting spot.

[0035] The material of the lens body 10 can be determined according to actual needs, and the embodiment of the present application does not limit this. In some embodiments, the lens body 10 can be an acrylic material body, which is made of a light-transmitting acrylic material. Acrylic materials have low cost and stable properties, and are easy to make into the lens body 10.

[0036] The shape of the first top wall 11 can be determined according to actual needs, and the embodiment of the present application does not limit this. In some embodiments, the first top wall 11 can be a curved thin wall that bulges away from the light entrance cavity 10a, and its surface can be a part of a curved surface such as a spherical surface or an ellipsoidal surface, and the embodiment of the present application does not limit this.

[0037] The shape of the second top wall 12 can be determined according to actual needs, and the embodiments of the present application do not limit this. In some embodiments, the second top wall 12 can be recessed along the first direction at one end of the circumferential side wall 13, and it is recessed in the inner cavity surrounded by the circumferential side wall 13; here, the second top wall 12 and the opening of the light entrance cavity 10a can be located at opposite ends of the circumferential side wall 13 along the first direction. The inner diameter of the second top wall 12 gradually decreases along the first direction, and the first direction is the direction connecting the opposite ends of the circumferential side wall 13, so that the cavity surrounded by the second top wall 12 is an expanded cavity, which is convenient for the top side light to be evenly diffused.

[0038] The location of the reflective layer 20 on the second top wall 12 can be determined according to actual needs, and this embodiment of the present application does not limit this. Figure 1As shown, in some embodiments, the reflective layer 20 can be disposed on a side surface of the second top wall 12 away from the light incident cavity 10a; thus, part of the light incident from the light incident cavity 10a is first irradiated onto the second top wall 12, and then passes through the second top wall 12 and is reflected back into the second top wall 12 by the reflective layer 20, and then passes through the second top wall 12 again and irradiates onto the circumferential side wall 13. Figure 2 As shown, in other embodiments, the reflective layer 20 can be arranged on a side surface of the second top wall 12 facing the light incident cavity 10a; in this way, part of the light incident from the light incident cavity 10a will directly irradiate the reflective layer 20, and will be directly reflected by the reflective layer 20 to the circumferential side wall 13 without contacting the second top wall 12.

[0039] The material of the reflective layer 20 can be determined according to actual needs, and can be made of, for example, a metal reflective coating, etc., which is not limited in the present embodiment of the application. Figures 5 to 7 As shown, in some embodiments, the reflective layer 20 may be provided with a patterned hollow portion 21 running through it, and the patterned hollow portion 21 extends to the surface of the second top wall 12. When the reflective layer 20 is disposed on a side surface of the second top wall 12 away from the light incident cavity 10a, part of the light incident from the light incident cavity 10a may be irradiated to the area on the second top wall 12 corresponding to the patterned hollow portion 21, and sequentially pass through the second top wall 12 and the patterned hollow portion 21 to be emitted, thereby forming a light output pattern corresponding to the shape of the patterned hollow portion 21; and when the reflective layer 20 is disposed on a side surface of the second top wall 12 facing the light incident cavity 10a, part of the light incident from the light incident cavity 10a is directly irradiated to the patterned hollow portion 21, and sequentially pass through the patterned hollow portion 21 and the second top wall 12 to be emitted.

[0040] Here, the pattern of the patterned hollow portion 21 can be set according to actual needs, so as to achieve the desired light type, and the embodiment of the present application does not limit this. By setting the pattern of the patterned hollow portion 21, the angle and position of the light emitted from the top side of the lens 1 can be accurately controlled, thereby improving the light efficiency of the lens 1.

[0041] In some embodiments, the patterned hollow portion 21 may include a plurality of annular grooves 211 arranged in sequence and spaced apart from each other, and the plurality of annular grooves 211 are arranged around the first top wall 11 respectively, so that the plurality of annular grooves 211 are spaced apart from each other from the center of the second top wall 12. In this way, the reflective layer 20 is divided into a plurality of annular reflective bands by the plurality of annular grooves 211, and the plurality of annular reflective bands are spaced apart from each other from the center of the second top wall 12. When light is irradiated to the area on the second top wall 12 corresponding to the annular groove 211, the light may pass through the second top wall 12 and the annular groove 211 in sequence and be emitted, thereby forming an annular light spot in the same shape as the annular groove 211.

[0042] like Figures 1 to 7 As shown, on the other hand, an embodiment of the present application provides a backlight module, which includes a lens 1 and a light-emitting element 2 provided in any of the above embodiments, and the light-emitting element 2 is embedded in the light incident cavity 10a. The type of the backlight module can be determined according to actual needs, and can adopt, for example, a direct-type backlight module, an edge-type backlight module, etc., which is not limited in the embodiment of the present application. The type of the light-emitting element 2 can be determined according to actual needs, and can adopt, for example, a MicroLED, Mini LED, etc., which is not limited in the embodiment of the present application. The backlight module provided in the embodiment of the present application has the above-mentioned lens 1, and thus has a lower material cost and a better light transmission and scattering effect, and can form a transmission light spot with higher brightness and uniformity, thereby achieving a better visual effect with higher brightness and uniform brightness.

[0043] In some embodiments, the backlight module may further include a back plate 3 and a reflective sheet 4. The light emitting element 2 and the reflective sheet 4 are respectively arranged on the back plate 3, and a avoidance hole is provided on the reflective sheet 4, and the light emitting element 2 is arranged through the avoidance hole. In some examples, the lens 1 can be arranged on the back plate 3 through the avoidance hole; in other examples, the lens 1 can be arranged on the side surface of the reflective sheet 4 away from the back plate 3. By arranging the reflective sheet 4, the light deflected to the back plate 3 can be reflected, so that all or at least most of the light emitted by the light emitting element 2 can be displayed, thereby improving the light emitting efficiency and display brightness.

[0044] In some embodiments, the backlight module may further include a diffuser and an optical film. The diffuser is disposed on the side of the lens 1 away from the back plate 3, and is used to uniformly diffuse the light passing through the diffuser; the optical film is disposed on the side of the diffuser away from the lens 1, and is used to perform optical conditioning such as diffusion and brightening on the light passing through the optical film.

[0045] The lens and backlight module 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 and core idea of ​​the present application. At the same time, for technicians in this field, 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 lens, characterized in that: The lens body comprises a first top wall, a second top wall and a circumferential side wall connected in sequence, the second top wall is arranged around the outer edge of the first top wall, the circumferential side wall is arranged around the outer edge of the second top wall, and the first top wall, the second top wall and the circumferential side wall enclose a light entrance cavity; A reflective layer is disposed on the surface of the second top wall, and the reflective layer is configured to reflect a portion of the light incident from the light incident cavity to the circumferential side wall.

2. The lens according to claim 1, characterized in that The reflective layer is provided with a patterned hollow portion penetrating therethrough, and the patterned hollow portion extends to the surface of the second top wall.

3. The lens according to claim 2, characterized in that The patterned hollow portion includes a plurality of annular grooves that are sequentially spaced apart, and the plurality of annular grooves are respectively arranged around the first top wall.

4. The lens according to any one of claims 1 to 3, characterized in that: The reflective layer is disposed on a surface of the second top wall that is away from the light incident cavity.

5. The lens according to claim 1, characterized in that The first top wall is a thin curved wall that bulges in a direction away from the light incident cavity.

6. The lens according to claim 1, characterized in that The second top wall is recessed along a first direction at one end of the circumferential side wall, and an inner diameter of the second top wall gradually decreases along the first direction, wherein the first direction is a direction connecting two opposite ends of the circumferential side wall.

7. The lens according to claim 1, characterized in that The lens body is made of acrylic material.

8. A backlight module, characterized in that: The invention comprises the lens and the light-emitting element according to any one of claims 1 to 7, wherein the light-emitting element is embedded in the light-incident cavity.

9. The backlight module according to claim 8, characterized in that: The backlight module further comprises a back plate and a reflective sheet. The light emitting element and the reflective sheet are respectively arranged on the back plate. The reflective sheet is provided with an avoidance hole, and the light emitting element is arranged to pass through the avoidance hole.

10. The backlight module according to claim 9, characterized in that: The lens passes through the avoidance hole and is disposed on the back plate, or the lens is disposed on a surface of the reflector sheet that is away from the back plate.

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