Optical lens, backlight module and display equipment

Abstract

The utility model discloses an optical lens, backlight module and display equipment relates to display equipment technical field, wherein the optical lens includes first lens portion and second lens portion, first lens portion is provided first lens portion bottom surface, first lens portion top surface is convex setting to form first emergent light surface, second lens portion bottom surface is convex setting to form second emergent light surface, second lens portion bottom surface is convex setting to form second emergent light surface, second lens portion bottom surface is convex setting to form second emergent light surface. The bottom face of the first lens part is concaved inwards to form a first containing groove used for containing a light source, the side wall of the first containing groove forms a first light inlet face, the side face of the second lens part forms a second light outlet face, a first concave cavity is formed in the top face of the second lens part, and the side wall of the first concave cavity is arranged towards the bottom face of the second lens part in a necking mode. A reflecting surface is formed on the side wall of the first concave cavity, a second light incident surface is formed on the bottom surface of the second lens part, and the first lens part is arranged on the bottom surface of the second lens part. According to the technical scheme, a large light emitting angle can be achieved, and meanwhile light emitting is even.

Description

Technical Field

[0001] The utility model relates to the technical field of display equipment, and in particular to an optical lens, a backlight module and a display equipment. Background Art

[0002] The primary purpose of LED optical lenses in display devices is to perform secondary optical processing on LED light sources, evenly distributing light to meet overall uniformity requirements and achieve a uniform display effect for display products. With the continuous increase in backlight LED power, especially for large-screen backlight products like TVs, the number of LED lamps in backlight products has gradually decreased while meeting a certain display brightness. However, lenses in related technologies have limited light output angles, concentrating light either at the top or at the edges, making it impossible to achieve the uniform backlighting required with a reduced number of lamps. Utility Model Content

[0003] The main purpose of the present invention is to provide an optical lens, a backlight module and a display device, aiming to at least solve the problem of limited light output angle and uneven light output of the lens in the related art.

[0004] To achieve the above-mentioned purpose, the present invention provides an optical lens comprising:

[0005] a first lens portion, disposed on a bottom surface of the first lens portion, wherein a top surface of the first lens portion is convex to form a first light emitting surface, and a bottom surface of the first lens portion is concave to form a first accommodating groove for accommodating a light source, wherein a sidewall of the first accommodating groove constitutes a first light incident surface; and

[0006] a second lens portion, wherein a second light emitting surface is formed on a side surface of the second lens portion, a first concave cavity is provided on a top surface of the second lens portion, a sidewall of the first concave cavity is tapered toward a bottom surface of the second lens portion, the sidewall of the first concave cavity forms a reflecting surface, and a second light incident surface is formed on the bottom surface of the second lens portion;

[0007] Wherein, the first lens portion is arranged on the bottom surface of the second lens portion.

[0008] In one embodiment, the bottom surface of the second lens portion is concave to form a second receiving groove, the sidewall of the second receiving groove forms the second light incident surface, and the first lens portion is located in the second receiving groove.

[0009] In one embodiment, a second cavity is provided on a side wall of the second accommodating groove facing the bottom surface of the second lens portion, and a side wall of the second cavity is narrowed toward the top surface of the second lens portion.

[0010] In one embodiment, the sidewall of the second cavity is a curved surface convex toward the second receiving groove.

[0011] In one embodiment, the optical lens further comprises a base;

[0012] The bottom surfaces of the first lens portion and the second lens portion are both fixedly arranged on the base.

[0013] In one embodiment, the first lens portion, the second lens portion, and the base are integrally formed.

[0014] In one embodiment, a reflective structure is further provided on the base, and the reflective structure is used to reflect light to the bottom surfaces of the first lens portion and the second lens portion.

[0015] In one embodiment, the base is transparent, and a plurality of reflective grooves are provided on the back side of the base, and the side walls of the plurality of reflective grooves constitute the reflective structure.

[0016] The present invention further provides a backlight module, comprising a circuit board, at least one optical lens and at least one light source, wherein the optical lens comprises:

[0017] a first lens portion, disposed on a bottom surface of the first lens portion, wherein a top surface of the first lens portion is convex to form a first light emitting surface, and a bottom surface of the first lens portion is concave to form a first accommodating groove for accommodating a light source, wherein a sidewall of the first accommodating groove constitutes a first light incident surface; and

[0018] a second lens portion, wherein a second light emitting surface is formed on a side surface of the second lens portion, a first concave cavity is provided on a top surface of the second lens portion, a sidewall of the first concave cavity is tapered toward a bottom surface of the second lens portion, the sidewall of the first concave cavity forms a reflecting surface, and a second light incident surface is formed on the bottom surface of the second lens portion;

[0019] The first lens portion is arranged on the bottom surface of the second lens portion, the optical lens is arranged on the circuit board, and the light source is arranged on the circuit board and is located corresponding to the first receiving groove.

[0020] The utility model also provides a display device, comprising the above-mentioned backlight module.

[0021] In the technical solution of the present utility model, the optical lens includes a first lens portion and a second lens portion, the first lens portion is arranged on the bottom surface of the first lens portion, the top surface of the first lens portion is convex to form a first light-emitting surface, the bottom surface of the first lens portion is concave to form a first accommodating groove for accommodating a light source, the side wall of the first accommodating groove constitutes a first light-entering surface, the side surface of the second lens portion is formed with a second light-emitting surface, the top surface of the second lens portion is provided with a first concave cavity, the side wall of the first concave cavity is arranged to be concave toward the bottom surface of the second lens portion, the side wall of the first concave cavity forms a reflecting surface, and the bottom surface of the second lens portion forms a second light-entering surface, wherein the first lens The portion is arranged on the bottom surface of the second lens portion; with this arrangement, the light emitted by the light source located in the first accommodating groove enters the first lens portion through the first light incident surface and is emitted from the first light emitting surface. The light is refracted and diffused to the surroundings, but at this time the light is more concentrated in the middle. Then, after entering the second lens portion through the second light incident surface, it is reflected by the reflecting surface and emitted from the second light emitting surface. The light is diffused again, thereby increasing the light emission angle. Part of the light that is more concentrated in the middle can be refracted through the reflecting surface due to the smaller incident angle, while part will be reflected by the reflecting surface to the surroundings, making the light emission more uniform. In this way, a larger light emission angle can be achieved, and the light emission is uniform at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of an embodiment of an optical lens provided by the present utility model;

[0024] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0025] Figure 3 for Figure 1 The light output curve of the optical lens in ;

[0026] Figure 4 This is a structural diagram of an embodiment of a backlight module provided by the present utility model.

[0027] Description of Figure Numbers:

[0028] 1000, backlight module; 100, optical lens; 1, first lens portion; 11, first accommodating groove; 101, first light-emitting surface; 102, first light-incident surface; 2, second lens portion; 21, first concave cavity; 22, second accommodating groove; 221, second concave cavity; 201, second light-emitting surface; 202, reflecting surface; 203, second light-incident surface; 3, base; 31, reflective structure; 311, reflective groove; 200, circuit board; 300, light source.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

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

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The primary purpose of LED optical lenses in display devices is to perform secondary optical processing on LED light sources, evenly distributing light to meet overall uniformity requirements and achieve a uniform display effect for display products. With the continuous increase in backlight LED power, especially for large-screen backlight products like TVs, the number of LED lamps in backlight products has gradually decreased while meeting a certain display brightness. However, lenses in related technologies have limited light output angles, concentrating light either at the top or at the edges, making it impossible to achieve the uniform backlighting required with a reduced number of lamps.

[0034] The main purpose of the present invention is to provide an optical lens, a backlight module and a display device, aiming to at least solve the problem of limited light output angle and uneven light output of the lens in the related art.

[0035] See also Figures 1 to 4 In one embodiment of the present utility model, the optical lens 100 includes a first lens portion 1 and a second lens portion 2, the first lens portion 1 is arranged on the bottom surface of the first lens portion 1, the top surface of the first lens portion 1 is convex to form a first light-emitting surface 101, the bottom surface of the first lens portion 1 is concave to form a first accommodating groove 11 for accommodating the light source 300, the side wall of the first accommodating groove 11 constitutes a first light-incident surface 102, the side surface of the second lens portion 2 is formed with a second light-emitting surface 201, the top surface of the second lens portion 2 is provided with a first concave cavity 21, the side wall of the first concave cavity 21 is concave toward the bottom surface of the second lens portion 2, the side wall of the first concave cavity 21 is concave to form a reflecting surface 202, and the bottom surface of the second lens portion 2 is formed with a second light-incident surface 203, wherein the first lens portion 1 is arranged on the bottom surface of the second lens portion 2.

[0036] In the technical solution of the present utility model, the optical lens 100 includes a first lens portion 1 and a second lens portion 2, the first lens portion 1 is arranged on the bottom surface of the first lens portion 1, the top surface of the first lens portion 1 is convex to form a first light-emitting surface 101, the bottom surface of the first lens portion 1 is concave to form a first accommodating groove 11 for accommodating a light source 300, the side wall of the first accommodating groove 11 constitutes a first light-incident surface 102, the side surface of the second lens portion 2 is formed with a second light-emitting surface 201, the top surface of the second lens portion 2 is provided with a first concave cavity 21, the side wall of the first concave cavity 21 is concave toward the bottom surface of the second lens portion 2, the side wall of the first concave cavity 21 is formed with a reflecting surface 202, and the bottom surface of the second lens portion 2 is formed with a second light-incident surface 203, wherein The first lens portion 1 is arranged on the bottom surface of the second lens portion 2; with such arrangement, the light emitted by the light source 300 located in the first accommodating groove 11 enters the first lens portion 1 through the first light incident surface 102, and is emitted from the first light emitting surface 101. The light is refracted and diffused to the surroundings, but at this time the light is more concentrated in the middle. Then, after entering the second lens portion 2 through the second light incident surface 203, it is reflected by the reflecting surface 202 and emitted from the second light emitting surface 201. The light is diffused again, increasing the light emission angle, and part of the light that is more concentrated in the middle can be refracted through the reflecting surface 202 due to the smaller incident angle, while part will be reflected by the reflecting surface 202 to the surroundings, making the light emission more uniform; in this way, a larger light emission angle can be achieved, and the light emission is uniform at the same time.

[0037] There are many ways to arrange the first lens portion 1 on the bottom surface of the second lens portion 2. For example, the first lens portion 1 is arranged in parallel with the second lens portion 2. However, when the light emitted by the light source 300 is refracted by the first light-emitting surface 101, especially the light near the edge, it is very likely that it will not pass through the second lens portion 2 and will be emitted directly, resulting in a limited light-emitting angle of the overall optical lens 100. In an embodiment of the present invention, in order to ensure that the light emitted from the first light-emitting surface 101 can enter the second lens portion 2 as much as possible, the bottom surface of the second lens portion 2 is concavely formed with a second accommodating groove 22, and the side wall of the second accommodating groove 22 forms the second light-entering surface 203, and the first lens portion 1 is located in the second accommodating groove 22; with such a configuration, the first lens portion 1 is located in the second accommodating groove 22, and when the light emitted by the light source 300 reaches the first light-emitting surface 101, it can basically enter the second accommodating groove 22, and then enter the second lens portion 2 through the side wall of the second accommodating groove 22, so that it can be further diffused to the surroundings through reflection by the reflecting surface 202 and refraction by the second light-emitting surface 201, thereby improving the light output angle.

[0038] It is understandable that after the light is emitted from the first light-emitting surface 101, the light is concentrated in the middle part, which will lead to uneven light distribution. The angle between the light in the middle part and the midline is small. When it reaches the reflecting surface 202, the incident angle will still be very small. Only a part of the light can be totally reflected on the reflecting surface 202. Most of the light is still refracted and emitted directly on the reflecting surface 202. In this way, although the light in the middle part is reduced and the light around is increased due to the action of the second lens portion 2, the light is still concentrated on the top of the first concave cavity 21. In order to further improve the light uniformity of the optical lens 100, in the embodiment of the present utility model, please refer to Figure 1 and Figure 2 The second accommodating groove 22 is provided with a second cavity 221 on the side wall facing the bottom surface of the second lens portion 2, and the side wall of the second cavity 221 is tapered towards the top surface of the second lens portion 2; with such a configuration, when the light passes through the side wall of the second cavity 221, the refraction effect of the side wall of the second cavity 221 can make the light entering the second lens portion 2 concentrate toward the center line with a smaller amplitude, so that when reaching the reflecting surface 202, the incident angle will not be reduced much relatively speaking, and more light can be reflected to the surroundings, thereby increasing the light around and reducing the light in the middle part, and the reflected light is refracted after reaching the second light-emitting surface 201, and can be diffused to a larger angle, so that the light-emitting angle and uniformity of the overall optical lens 100 are improved.

[0039] The sidewall of the second concave cavity 221 that is set in a concave shape can be set in a straight line or in an arc shape. As can be seen from the above, after the light is emitted from the first light-emitting surface 101, the more light is emitted closer to the middle, and the incident angle when it reaches the reflecting surface 202 will be smaller. That is, although the sidewall of the second concave cavity 221 set in a straight line can improve the light uniformity of the top and surrounding areas of the first concave cavity 21, it will cause the light in the middle part to pass through the cavity. In order to further improve the light uniformity of the optical lens 100, in the embodiment of the present utility model, the second concave cavity 221 The side wall is an arc surface protruding into the second accommodating groove 22. With such a configuration, after the light is emitted from the first light-emitting surface 101, when it reaches the side wall of the second concave cavity 221, the light near the middle part of the second concave cavity 221 will be diffused to the surroundings and may be emitted directly through the second light-emitting surface 201. Even if it is not emitted directly from the second light-emitting surface 201, but reaches the reflecting surface 202, its incident angle will increase, and total reflection will be more likely to occur. With such a configuration, the light in the middle of the top of the second concave cavity 221 can be further reduced, thereby improving uniformity.

[0040] Please refer to Figure 4The optical lens 100 is fixed to the circuit board 200 during use, that is, both the first lens portion 1 and the second lens portion 2 are fixed to the circuit board 200. During actual installation, if the two are fixed separately, installation becomes more troublesome and it is easy to cause the positional relationship between the first lens portion 1 and the second lens portion 2 to deviate from the preset positional relationship. Therefore, in an embodiment of the present utility model, the optical lens 100 further includes a base 3; the bottom surfaces of the first lens portion 1 and the second lens portion 2 are both fixedly disposed on the base 3. In this way, the first lens portion 1 and the second lens portion 2 are connected by the base 3. When installing on the circuit board 200, it is only necessary to fix the base 3 to the circuit board 200.

[0041] Furthermore, in this embodiment, the first lens portion 1, the second lens portion 2, and the base 3 are integrally formed. This makes the production of the optical lens 100 more convenient. There are various methods for integrally forming the optical lens, such as injection molding or 3D printing.

[0042] After the light passes through the first lens portion 1 and the second lens portion 2, the light emitted by the light source 300 will not all be emitted from the first light-emitting surface 101, the second light-emitting surface 201 and the reflective surface 202. Some light will not be emitted to the bottom surface of the first lens portion 1 and the second lens portion 2, that is, it may be emitted from the base 3, resulting in a decrease in the light emitted from the front. In order to increase the amount of light emitted from the front of the optical lens 100, please refer to Figure 1 The base 3 is further provided with a reflective structure 31, which is used to reflect light toward the bottom surfaces of the first lens portion 1 and the second lens portion 2. Thus, when light strikes the reflective structure 31 on the base 3, it is reflected toward the bottom surfaces of the first lens portion 1 and the second lens portion 2. After reflection and refraction, part of this light is emitted from the second light-emitting surface 201 and the reflective surface 202, thereby increasing the amount of light emitted from the front of the optical lens 100.

[0043] The reflective structure can take various forms. In this embodiment, the base 3 is transparent, with multiple reflective grooves 311 disposed on the back of the base 3. The sidewalls of the reflective grooves 311 constitute the reflective structure 31. When light strikes the sidewalls of the reflective grooves 311, some of the light is reflected, thereby reducing the amount of light diverging from the bottom and increasing the amount of light emitted from the front. Of course, the reflective structure can also be a reflective coating applied to the back of the base 3, such as a white silk-screen coating.

[0044] This design does not limit the shape of the reflective groove 311, for example Figure 1 and Figure 4 As shown, the reflective groove 311 may be hemispherical, ellipsoidal or diamond-shaped, as long as the divergence of light from the bottom surface of the base 3 can be reduced.

[0045] The present invention also provides a backlight module 1000, which includes a circuit board 200, at least one light source 300, and at least one optical lens 100. The specific structure of the optical lens 100 is similar to the above-mentioned embodiments. Since the present backlight module 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here. The optical lens 100 is disposed on the circuit board 200, and the light source 300 is disposed on the circuit board 200 and is located corresponding to the first receiving groove 11.

[0046] In the technical solution of the present invention, the light emitted by the light source 300 located in the first accommodating groove 11 enters the first lens portion 1 through the first light incident surface 102, and is emitted from the first light emitting surface 101. The light is refracted and diffused to the surroundings, but at this time the light is more concentrated in the middle. Then, after entering the second lens portion 2 through the second light incident surface 203, it is reflected by the reflecting surface 202 and emitted from the second light emitting surface 201. The light is diffused again, increasing the light emission angle, and part of the light that is more concentrated in the middle can be refracted through the reflecting surface 202 due to the small incident angle, and part will be reflected by the reflecting surface 202 to the surroundings, making the light emission more uniform; in this way, a larger light emission angle can be achieved, and the light emission is uniform at the same time.

[0047] The present invention also proposes a display device, which includes a backlight module 1000. The specific structure of the backlight module 1000 refers to the above embodiment. Since the present display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0048] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An optical lens, characterized in that: include: a first lens portion, disposed on a bottom surface of the first lens portion, wherein a top surface of the first lens portion is convex to form a first light emitting surface, and a bottom surface of the first lens portion is concave to form a first accommodating groove for accommodating a light source, wherein a sidewall of the first accommodating groove constitutes a first light incident surface; as well as, a second lens portion, wherein a second light emitting surface is formed on a side surface of the second lens portion, a first concave cavity is provided on a top surface of the second lens portion, a sidewall of the first concave cavity is tapered toward a bottom surface of the second lens portion, the sidewall of the first concave cavity forms a reflecting surface, and a second light incident surface is formed on the bottom surface of the second lens portion; Wherein, the first lens portion is arranged on the bottom surface of the second lens portion.

2. The optical lens according to claim 1, wherein The bottom surface of the second lens portion is concave to form a second accommodating groove, the sidewall of the second accommodating groove forms the second light incident surface, and the first lens portion is located in the second accommodating groove.

3. The optical lens according to claim 2, wherein: A second cavity is provided on the side wall of the second accommodating groove facing the bottom surface of the second lens portion, and the side wall of the second cavity is configured to be constricted toward the top surface of the second lens portion.

4. The optical lens according to claim 3, wherein The side wall of the second cavity is an arc surface convex toward the second receiving groove.

5. The optical lens according to claim 2, wherein: The optical lens further includes a base; The bottom surfaces of the first lens portion and the second lens portion are both fixedly arranged on the base.

6. The optical lens according to claim 5, wherein: The first lens portion, the second lens portion and the base are integrally formed.

7. The optical lens according to claim 5, wherein: The base is further provided with a reflective structure, which is used to reflect light to the bottom surfaces of the first lens portion and the second lens portion.

8. The optical lens according to claim 7, wherein: The base is transparent, and a plurality of reflective grooves are provided on the back of the base. The side walls of the plurality of reflective grooves constitute the reflective structure.

9. A backlight module, characterized in that: include: circuit boards; at least one optical lens, disposed on the circuit board, wherein the optical lens is the optical lens according to any one of claims 1 to 8; as well as, At least one light source is disposed on the circuit board and located corresponding to the first receiving groove.

10. A display device, characterized in that: Comprising the backlight module as claimed in claim 9.

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