Fisheye lens, light source assembly and display device

Abstract

This application provides an expanding lens, a light source assembly, and a display device, belonging to the field of optical technology. The expanding lens includes a body with a light-emitting surface, a light-entry aperture, and a mounting surface. The light-emitting surface is located on one side of the body; the light-entry aperture is located on the other side of the body, and the inner surface of the light-entry aperture is the light-entry surface; the mounting surface surrounds the aperture; multiple annular grooves are provided on the mounting surface; each annular groove is a V-shaped groove, and each annular groove has a first groove side away from the axis of the body and a second groove side close to the axis of the body. The first groove side is an arc-shaped surface, and the arc-shaped surface is concave within the body. This application defines a light-guiding microstructure at the bottom of the lens through multiple annular grooves, thereby achieving total internal reflection of the light reflected from the light-emitting surface, and causing these lights to be focused and dispersed inside the body, performing preliminary light mixing, thereby expanding the projection angle of the light, which is beneficial for increasing the size and quality of the light spot, and improving the uniformity of the light from the light source.

Description

Technical Field

[0001] This application relates to the field of optical technology, and in particular to an expanding lens, a light source assembly, and a display device. Background Technology

[0002] With the development of applications such as high-definition video, people have increasingly higher requirements for the display quality of display devices, and these devices also need to be made thinner and thinner. LCD monitors are flat-panel display devices whose liquid crystal panels cannot emit light directly, requiring a backlight module to provide the light source. Based on the light incident method, backlight modules can generally be divided into edge-lit backlight modules and direct-lit backlight modules. In edge-lit backlight modules, the light source is located on the side of the panel, and light enters a light guide plate from the side of the panel. Dots are set on the back of the light guide plate, which disrupts the original total internal reflection structure, allowing light to enter the liquid crystal panel. In direct-lit backlight modules, the light source is located on the back of the panel. Light is emitted directly onto the panel. Compared to edge-lit backlight modules, direct-lit backlight modules can provide the display panel with higher overall brightness and better display effects, making them especially suitable for large-size display devices.

[0003] In related technologies, in order to obtain uniform, soft and well-mixed light, an expanding lens is usually placed on the light source (such as a light-emitting diode LED or a mini LED) so that the light emitted by the light source can be emitted at a larger angle to the diffuser plate, film, etc. after passing through the lens, thereby improving the uniformity of the light display on the panel.

[0004] Currently, wide-angle lenses have poor effect on the uniformity of light from light sources. Summary of the Invention

[0005] This application provides an expanding lens, a light source assembly, and a display device to at least solve the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, a widening lens is provided, comprising a body having a light-emitting surface, a light-entry aperture, and a mounting surface; the light-emitting surface is disposed on one side of the body; the light-entry aperture is disposed on the other side of the body, the opening of the light-entry aperture facing away from the light-emitting surface, and the inner surface of the light-entry aperture being the light-entry surface; the mounting surface and the light-entry aperture are located on the same side of the body and are disposed around the opening, and the edge of the mounting surface near the opening is connected to the edge of the light-entry surface near the opening; wherein, a plurality of annular grooves surrounding the light-entry aperture are provided on the mounting surface, the plurality of annular grooves being arranged sequentially along the radial direction of the body; each annular groove is a V-shaped groove, and each annular groove has a first groove side away from the axis of the body and a second groove side near the axis of the body, the first groove side being an arc-shaped surface, and the arc-shaped surface being concave inward of the body.

[0007] Optionally, the depth of the annular grooves decreases sequentially from the center of the body outward in a radial direction, and the bottom of all the annular grooves is on the same straight line K, with the straight line K forming an acute angle A with the plane where the mounting surface is located.

[0008] Optionally, the size of the acute angle A is 0.5° to 10°.

[0009] Optionally, the side of the second groove is parallel to the axis of the body.

[0010] Optionally, the depth of the entrance aperture is H0, and the depth of the annular groove is Hh, satisfying: Hh≤20%H0; And / or, the annular groove has a width dimension Wh in the radial direction of the body, and the outer radius of the mounting surface is R0, satisfying: 3%R0≤Wh≤20%R0.

[0011] Optionally, in a plane parallel to the mounting surface, the total projected area of ​​the mounting surface without an annular groove and the mounting surface with an annular groove is S0, and the total projected area of ​​the annular groove is Sh, satisfying: 60%S0≤Sh≤90%S0.

[0012] Optionally, a group of protrusions is provided on the light-emitting surface. The group of protrusions includes multiple protrusions, which are distributed along a spiral line on the light-emitting surface. The spiral line extends spirally from the center of the light-emitting surface along the surface of the light-emitting surface to the edge of the light-emitting surface.

[0013] Optionally, two sets of protrusions are provided on the light-emitting surface, namely the first set of protrusions and the second set of protrusions. There are two spirals, namely the first spiral and the second spiral. The starting points of the first spiral and the second spiral are symmetrically distributed about the center of the light-emitting surface. The first set of protrusions is distributed along the first spiral on the light-emitting surface, and the second set of protrusions is distributed along the second spiral on the light-emitting surface. Among them, the surface of the protrusions facing away from the body is an outwardly convex arc surface; multiple protrusions of the first protrusion group are connected in sequence along the first spiral line, multiple protrusions of the second protrusion group are connected in sequence along the second spiral line, and multiple protrusions of the first protrusion group and multiple protrusions of the second protrusion group are connected in sequence from the center of the light-emitting surface to the edge of the light-emitting surface.

[0014] According to a second aspect of this application, a light source assembly is provided, the light source assembly including an LED, a circuit board and the aforementioned expanding lens; the LED is disposed in a light entrance hole; the circuit board is connected to the LED and contacts a mounting surface.

[0015] According to a third aspect of this application, a display device is provided, the display device including the aforementioned light source assembly.

[0016] In the wide-angle lens of this application embodiment, by setting multiple annular grooves on the mounting surface of the wide-angle lens, a light-guiding microstructure is defined at the bottom of the lens through the multiple annular grooves, thereby performing total internal reflection of the light reflected from the light-emitting surface, and causing these light rays to be focused and dispersed inside the body for preliminary light mixing, thereby expanding the projection angle of the light, which is beneficial to increasing the size and quality of the light spot and improving the uniformity of the light from the light source.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 It is the light spot formed after the light source passes through the wide-angle lens in the related technology; Figure 2 This is a schematic diagram of the structure of the expanding lens provided in an exemplary embodiment of this application; Figure 3 This is a side view of the expanding lens provided in an exemplary embodiment of this application; Figure 4 It is along Figure 3 Sectional view of AA; Figure 5 yes Figure 4 Enlarged schematic diagram of part B; Figure 6 This is a schematic diagram of the structure of an expanding lens with protrusions provided in an exemplary embodiment of this application; Figure 7 This is a schematic diagram of the distribution of two spiral lines provided in an exemplary embodiment of this application; Figure 8 yes Figure 6 The diagram shows the internal structure of the expanding lens; Figure 9 This is a schematic diagram of the structure of an expanding lens with a microstructure on the light-incident surface provided in an exemplary embodiment of this application; Figure 10 The light spot is formed by mixing the light from the light source with the wide-angle lens provided in the exemplary embodiment of this application; Figure 11 This is a schematic diagram of the structure of the light source assembly provided in an exemplary embodiment of this application; Explanation of reference numerals in the attached figures: 100 - Light source assembly; 10-Expanding lens; 11-Body; 12-Emitting light surface; 13-Light entrance aperture; 14-Mounting surface; 15-Light entrance surface; 16-Annular groove; 161-Side side of the first groove; 162-Side side of the second groove; 17-Protrusion; 181-First spiral; 182-Second spiral; 19-Pillar foot; 21-LED chip; 22-Circuit board. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0022] Before introducing the wide-angle lens, light source assembly, and display device provided in the embodiments of this application, the preamble of the embodiments of this application will be introduced first.

[0023] In the field of backlight displays, to obtain uniform, soft, and well-mixed light, wide-angle lenses are usually used with LEDs (Light Filters). Emitting Diode (light-emitting diode) or Mini Using light sources such as LEDs (sub-millimeter light-emitting diodes), the light emitted from the light source can be emitted at a larger angle to the diffuser plate, film, and LCD film, thereby achieving the display effect of the LCD panel.

[0024] In a direct-lit backlight module, each light source, after being transmitted through a wide-angle lens, forms a separate circular spot on the rear diffuser plate. This spot is brighter in the center and darker at the edges, affecting display uniformity. Therefore, in a direct-lit backlight module, many light sources are arranged together, with the illumination areas of adjacent light sources overlapping and mating. In this way, countless light spots are superimposed and merged, ultimately forming a continuous and complete backlight surface on the diffuser plate, which then emits light towards the LCD panel. Thus, the wide-angle lens ensures that the light emitted by the light source is evenly diffused over the largest possible area, and the overlapping of the light spots formed by these light sources creates a beam pattern on the illuminated surface, improving display uniformity.

[0025] Meanwhile, in order to make the brightness of the emitted overlapping light spots uniform and the color tolerance small, it is usually necessary to configure a thicker high haze diffuser plate with low light transmittance and a lot of optical films (such as diffuser sheets, prism sheets, DOP, DOPP, MOP, DBEF, etc.), which will lead to higher display device costs.

[0026] Furthermore, wide-angle lenses typically have a rotationally symmetric structure and a smooth surface. Light is refracted twice, at both the incident and exit surfaces, increasing the emission angle. While this double refraction increases the emission angle and improves light mixing uniformity, when LED white light is emitted from a blue LED chip and phosphor, it is not a single, pure color; that is, it is not a single-wavelength light. The wavelength range of this white light is generally 380nm-780nm. With the same material, the refractive index of shorter wavelengths is greater than that of longer wavelengths. This results in a larger refractive range for shorter wavelengths under the same curvature, leading to a larger light spot. This is the fundamental reason why wide-angle lenses are prone to chromatic aberration; different wavelengths have different refractive indices, causing chromatic aberration in the light passing through the wide-angle lens, resulting in a noticeable light spot. Figure 1 As shown. Figure 1 In the light spot formed by the light transmitted through the wide-angle lens, the yellow spot is obvious, the overall light spot transition is uneven, and the light spot quality is poor.

[0027] In some feasible implementations, to improve light mixing uniformity and solve the light spot problem, it is necessary to increase the OD (optical distance) value, configure a thicker, low-transmittance, high-haze diffuser plate, and use more optical films. This leads to higher costs. Furthermore, while increasing the OD value can improve the light spot effect, it increases the thickness of the display device, affecting its aesthetics and texture. The OD value refers to the light mixing distance from the surface of the LED strip on the PCB to the bottom surface of the diffuser plate; that is, the vertical air gap height between the emitting surface of the LED and the bottom surface of the diffuser plate.

[0028] Based on this, the embodiments of this application provide a light-guiding microstructure on the expanding lens, so that the light is fully mixed under the refraction and reflection of the lens, thereby obtaining a high-quality light spot with small color tolerance and improving the light output display effect of the display device. OD space refers to the space between the surface of the LED strip and the lower surface of the diffuser plate on the PCB printed circuit board.

[0029] The following combination Figures 2 to 9 The present application provides a detailed description of an expanding lens 10, a light source assembly 100, and a display device provided in the embodiments of this application.

[0030] Please see Figure 2 , Figure 3 , Figure 4 and Figure 5In a first aspect, embodiments of this application provide an expanding lens 10, which includes a body 11. The body 11 has a light-emitting surface 12, a light-entry aperture 13, and a mounting surface 14. The light-emitting surface 12 is disposed on one side of the body 11. The light-entry aperture 13 is disposed on the other side of the body 11. The opening of the light-entry aperture 13 faces away from the light-emitting surface 12. The inner surface of the light-entry aperture 13 is a light-entry surface 15. The mounting surface 14 is located on the same side of the body 11 as the light-entry aperture 13 and is disposed around the aperture. The edge of the mounting surface 14 near the aperture is connected to the edge of the light-entry surface 15 near the aperture. A plurality of annular grooves 16 surrounding the light-entry aperture 13 are provided on the mounting surface 14. The plurality of annular grooves 16 are arranged sequentially along the radial direction of the body 11. Each annular groove 16 is a V-shaped groove. Each annular groove 16 has a first groove side surface 161 away from the axis of the body 11 and a second groove side surface 162 near the axis of the body 11. The first groove side 161 is an arc-shaped surface, and the arc-shaped surface is recessed into the body 11.

[0031] It is understandable that the expanding lens 10 has a small structure when used in a display device. Therefore, the annular groove 16 provided in the body 11 has a tiny structural characteristic and can also be referred to as a microstructure provided in the expanding lens 10.

[0032] For example, the side surface 161 of the first groove can be a sphere, a cylinder, a freeform surface, etc.

[0033] It can be understood that the mounting surface 14 is a plane, which is the surface on which the wide-angle lens 10 and the circuit board 22 are attached.

[0034] It is understandable that the light inlet 13 is used to install the light source.

[0035] The angle between the second groove side 162 and the plane where the mounting surface 14 is located on the side closest to the first groove side 161 is between 45° and 90°.

[0036] like Figure 4 As shown, three rays of light are used for illustration. The three rays emitted by the light source are refracted by the light-incident surface 15 and enter the interior of the body 11. Then, part of them are emitted through the light-outcrystal surface 12 and emitted into the OD space for light mixing. The other part is reflected by the light-outcrystal surface 12 and emitted towards the mounting surface 14. After being reflected by the side surface 161 of the first slot, the emission angle is changed. Finally, they are emitted through the light-outcrystal surface 12 and emitted into the OD space for light mixing.

[0037] Specifically, after light is emitted from the light source, it enters the light-incident surface 15 through the light-incident aperture 13, undergoing the first refraction. Then, the light shines on the light-exiting surface 12, where it splits into two parts. The first part of the light passes through the light-exiting surface 12 and is refracted out, entering the OD space and mixing with other light rays before being projected onto the receiving surface to form a light spot. The second part of the light undergoes interface reflection at the light-exiting surface 12 and returns to the bottom of the wide-angle lens 10 (i.e., at the mounting surface 14). The light returning to the bottom of the wide-angle lens 10 undergoes total internal reflection at the first slot side surface 161. The first slot side surface 161 increases the angle of light projection and the intersection of light rays to form an internal focal point, resulting in preliminary light mixing. Then, the light reflected by the first slot side surface 161 shines on the light-exiting surface 12, is refracted on it, and enters the OD space. Finally, the light is projected onto the receiving surface to form a light spot again. Thus, the microstructure defined by the multiple annular grooves 16 at the bottom of the lens plays a role in total internal reflection, thereby expanding the projection angle of light and enabling preliminary light mixing, which is beneficial to increasing the size and quality of the light spot.

[0038] It can be understood that the first groove side 161 is configured to reflect the light illuminating the first groove side 161, and to make the light reflected by the first groove side 161 converge at a point within the body 11 (i.e., the light reflected by the first groove side 161 forms an internal focal point within the body 11) before being dispersed.

[0039] It is understood that the transmittance and reflectance of the light-emitting surface 12 and the reflectance of the side surface 161 of the first groove are set according to the actual scenario, and this application embodiment does not limit them.

[0040] In this embodiment, by providing multiple annular grooves 16 on the mounting surface 14 of the wide-angle lens 10, a light-guiding microstructure is defined at the bottom of the lens through the multiple annular grooves 16, thereby performing total internal reflection on the light reflected from the light-emitting surface 12, and causing these light rays to be focused and dispersed inside the body 11 for preliminary light mixing, thereby expanding the projection angle of the light, which is beneficial to increasing the size and quality of the light spot and improving the uniformity of the light from the light source by the lens.

[0041] Please see Figure 4 and Figure 5 In some embodiments, the depth of the annular grooves 16 decreases sequentially from the center of the body 11 outwards in a radial direction, and the bottoms of all the annular grooves 16 are on the same straight line K, with the straight line K forming an acute angle A with the plane containing the mounting surface 14. In this way, by uniformly controlling the apex of each annular groove 16 to be on the same inclined straight line, the light reflected through the side surface 161 of the first groove transitions evenly, which is beneficial for expanding the angle and softness of the light.

[0042] Specifically, with the axis of body 11 and Figure 5A coordinate system is established with the origin O as the intersection of the horizontal lines representing the mounting surface 14, the horizontal lines representing the mounting surface 14 as the X-axis, and the axis of the body 11 as the Y-axis. Correspondingly, located at... Figure 4 The straight line on the right, K=a X+B, where a=-tanA, a is the slope of line K, and A is the angle between the line and the mounting surface 14. Figure 5 In the middle, the vertex of each annular groove 16 lies on the straight line K.

[0043] The angle A of the acute angle is generally between 0.5° and 10°. Specifically, the angle A of the acute angle is between 1° and 5°.

[0044] As the depths of the annular grooves 16 follow an arithmetic progression, the openings of the annular grooves 16 also follow an arithmetic progression. The width of the annular groove 16 closest to the entrance aperture 13 is greater than the width of the annular groove 16 furthest from the entrance aperture 13. The width of the annular groove 16 closest to the entrance aperture 13 is defined as B1. As the annular groove 16 moves further away from the entrance aperture 13, its width is defined as B2, B3, ..., Bn, where Bn = B1 - (n-1)d. n is the number of annular grooves 16, and d is the width difference between two adjacent annular grooves 16.

[0045] In some embodiments, the acute angle A is 0.5° to 10°.

[0046] It is understood that the size of the acute angle A includes, but is not limited to, 0.5°, 0.8°, 1.2°, 1.6°, 2.0°, 2.3°, 2.7°, 3.1°, 3.4°, 3.8°, 4.2°, 4.5°, 4.9°, 5.3°, 5.6°, 6.0°, 6.4°, 6.7°, 7.1°, 7.5°, 7.8°, 8.2°, 8.6°, 8.9°, 9.1°, 9.3°, 9.5°, 9.7°, 9.9°, and 10.0°.

[0047] In this embodiment, the above-mentioned limitations ensure that the size of the acute angle A is appropriate, avoiding the formation of stray light spots due to the excessively large angle affecting the efficiency of the light refracted by the light entrance aperture 13 for the first time, and also avoiding the formation of stray light spots due to the excessively small angle causing the reflection angle of the light on the side 162 of the second groove to be too small, resulting in an insignificant initial light mixing effect.

[0048] Please see Figure 4 In some embodiments, the second groove side 162 is parallel to the axis of the body 11. This allows for control of the width of the annular groove 16, enabling more annular grooves 16 to be provided on the mounting surface 14, which improves the uniformity of the lens's light from the light source.

[0049] Please see Figure 4 and Figure 5In some embodiments, the depth of the light entrance aperture 13 is H0, and the depth of the annular groove 16 is Hh, satisfying that Hh ≤ 20%H0. In this way, controlling the depth of the annular groove 16 ensures the efficiency of light refraction by the light entrance surface 15 and avoids the formation of stray light spots.

[0050] Please see Figure 4 and Figure 5 In some embodiments, the annular groove 16 has a width dimension Wh in the radial direction of the body 11, and the outer radius of the mounting surface 14 is R0, satisfying: 3%R0≤Wh≤20%R0.

[0051] In this embodiment, the width of the annular groove 16 can be controlled by the above-mentioned limitation, so that the body 11 has a suitable space to arrange the side 161 of the first groove, so as to avoid the light from being too sharp and forming a strong bright spot while improving the reflection angle, and at the same time, it is also conducive to increasing the light spot, thereby improving the overall visual effect.

[0052] In some embodiments, in a plane parallel to the mounting surface 14, the total projected area of ​​the portion of the mounting surface 14 without the annular groove 16 and the portion with the annular groove 16 is S0, and the total projected area of ​​the annular groove 16 is Sh, satisfying: 60%S0≤Sh≤90%S0. This ensures that the total projected area of ​​the annular groove 16 is appropriately proportioned, thereby guaranteeing both sufficient light mixing of the wide-angle lens 10 and a suitable area for mating with the circuit board 22, thus facilitating the installation stability of the wide-angle lens 10.

[0053] It can be understood that the total projected area of ​​the annular groove 16, Sh, includes but is not limited to 60%S0, 62%S0, 64%S0, 66%S0, 67%S0, 69%S0, 71%S0, 73%S0, 75%S0, 77%S0, 79%S0, 80%S0, 82%S0, 83%S0, 85%S0, 86%S0, 87%S0, 88%S0, 89%S0, and 90%S0.

[0054] Please see Figure 6 In some embodiments, a group of bumps is provided on the light-emitting surface 12. The group of bumps includes a plurality of bumps 17. The plurality of bumps 17 are distributed along a spiral line on the light-emitting surface 12. The spiral line extends spirally from the center of the light-emitting surface 12 along the surface of the light-emitting surface 12 toward the edge of the light-emitting surface 12.

[0055] It is understandable that each of the 17 protrusions is a microstructure.

[0056] Specifically, such as Figure 8As shown, light from the light source is refracted through the incident surface 15 and enters the body 11. The light then passes through the body 11 and strikes the emitting surface 12 and the protrusions 17 attached to the emitting surface 12, resulting in a second refraction. Because the emitting surface 12 has protrusions 17 attached to it, the light's refraction pattern changes at these protrusions. The protrusions 17 not only increase the length of the original principal line of the emitting surface 12 but also increase the curvature change of the surface of the expanding lens 10 used for light emission, thus redistributing the light emission pattern, increasing the light emission angle, and improving the light mixing effect. This enhances the light spot effect on the projected surface.

[0057] The light-emitting surface 12 (i.e., the center point of the light-emitting surface 12) is positioned downwards, while the light-incident surface 15 (i.e., the center point of the light-incident surface 15) is positioned upwards. This increases the refraction effect of light, thus expanding the range of the light spot. The distance between the light-emitting surface 12 and the light-incident surface 15 is not less than 0.1 mm to ensure the strength of the expanding lens 10 located between the light-emitting surface 12 and the light-incident surface 15, thereby ensuring the quality of the expanding lens 10.

[0058] The circumferential surface of the body 11 located between the light-emitting surface 12 and the mounting surface 14 is the mold parting surface.

[0059] Multiple pins 19 are provided around the mounting surface 14. The pins 19 serve as positioning and fixing references for the SMT (Surface-Mount-Technology) PCB (Printed Circuit Board) and the wide-angle lens 10.

[0060] Please see Figure 6 and Figure 7 In some embodiments, two sets of protrusions are provided on the light-emitting surface 12. These two sets of protrusions are designated as a first set and a second set. There are two spirals: a first spiral 181 and a second spiral 182. The starting points of the first spiral 181 and the second spiral 182 are symmetrically distributed about the center of the light-emitting surface 12. The first set of protrusions is distributed along the first spiral 181 on the light-emitting surface 12, and the second set of protrusions is distributed along the second spiral 182 on the light-emitting surface 12. This improves the structural uniformity of the wide-angle lens 10, thus enhancing the uniformity of light emission.

[0061] For example, the formulas for the first helix 181 and the second helix 182 are as follows: First spiral 181: X=P (1+T) cos(T 2 π), Y=P (1+T) sin(T 2 π); Second spiral 182: X = -P (1+T) cos(T 2 π), Y = -P (1+T) sin(T 2 π).

[0062] Where P represents the pitch, that is, the distance between the previous and next revolutions in the same radial direction; T represents the number of revolutions; In this embodiment, microstructures such as protrusions 17 are added to the light-emitting surface 12, and the protrusions 17 are arranged in two spirals. The protrusions 17 can be evenly distributed on the light-emitting surface 12, which is beneficial for light control, that is, increasing the emission angle. At the same time, the protrusions 17 can also intersect in the front space away from the body 11 to form a focal point, increasing the degree of light mixing and improving the quality of the light spot.

[0063] Additionally, microstructures can be selectively distributed on the light-receiving surface 15 as needed, such as... Figure 9 As shown. The microstructure mentioned in this embodiment is a tiny structure disposed on the optical surface of the expanding lens 10 to change the original angle of light.

[0064] Under the combined effect of the protrusion 17 and the annular groove 16, the lens alters the light from the light source as follows: The light undergoes a first refraction through the incident surface 15 and then enters the exit surface 12. The first portion of the light illuminating the exit surface 12 undergoes a second refraction at the exit surface 12 and is refracted out, entering the OD space. At this time, because of the addition of the protrusion 17 microstructure on the main line of the exit surface 12, the first portion of the light will form a focal point in front of the protrusion 17 facing the light-emitting direction. The light will undergo a first mixing after passing through the focal point and then be projected onto the receiving surface to form a light spot. The second portion of the light illuminating the exit surface 12 will undergo interface reflection at the exit surface 12 and return to the bottom of the wide-angle lens 10 (i.e., at the mounting surface 14). The light returning to the bottom of the wide-angle lens 10 will undergo total internal reflection at the first groove side surface 161. The first groove side surface 161 increases the angle of light projection and the light crosses to form an internal focal point, resulting in preliminary light mixing. Then, the light reflected by the first groove side surface 161 illuminates the exit surface 12. Because a protrusion 17 is added to the light-emitting surface 12, the light that shines on the light-emitting surface 12 again will form a focal point in front of the protrusion 17 after passing through the body 11. The light will undergo a second mixing after passing through the focal point, and then be projected onto the receiving surface to form a light spot.

[0065] The microstructure formed by the annular groove 16 on the mounting surface 14 serves to increase the projection angle of light through total internal reflection and to perform initial light mixing. The light-emitting surface 12 performs secondary light mixing and increases the size and quality of the light spot. Simultaneously, the addition of the protrusion 17 microstructure to the light-emitting surface 12 further enhances the light mixing effect and improves the light spot quality. Figure 10 As shown.

[0066] Please see Figure 6 and Figure 7 In some embodiments, the surface of the protrusion 17 facing away from the body 11 is an outwardly convex arc surface. Multiple protrusions 17 of the first protrusion group are connected sequentially along a first spiral line 181. Multiple protrusions 17 of the second protrusion group are connected sequentially along a second spiral line 182. The multiple protrusions 17 of the first and second protrusion groups are connected sequentially from the center of the light-emitting surface 12 towards its edge. This improves the structural uniformity of the wide-angle lens 10, thus enhancing the uniformity of light output.

[0067] Please see Figure 11 Secondly, embodiments of this application provide a light source assembly 100, which includes an LED 21, a circuit board 22, and the aforementioned wide-angle lens 10. The LED 21 is disposed in the light entrance aperture 13. The circuit board 22 is connected to the LED 21 and contacts the mounting surface 14.

[0068] It is understood that the light source assembly 100 includes the aforementioned expanding lens 10, and the light source assembly 100 has all the beneficial effects of the aforementioned expanding lens 10, which will not be repeated here.

[0069] According to a third aspect of this application, a display device is provided, the display device including the aforementioned light source assembly 100.

[0070] It is understood that the display device includes the aforementioned light source component 100, and the display device has all the beneficial effects of the aforementioned light source component 100, which will not be repeated here.

[0071] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0073] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A wide-angle lens (10), characterized in that, Includes a body (11), said body (11) having: The light-emitting surface (12) is disposed on one side of the body (11); An entrance aperture (13) is disposed on the other side of the body (11), the opening of the entrance aperture (13) faces away from the light-emitting surface (12), and the inner surface of the entrance aperture (13) is the entrance surface (15); and The mounting surface (14) is located on the same side of the body (11) as the light inlet hole (13) and is arranged around the opening. The edge of the mounting surface (14) near the opening is connected to the edge of the light inlet surface (15) near the opening. Among them, a plurality of annular grooves (16) surrounding the light inlet hole (13) are provided on the mounting surface (14), and the plurality of annular grooves (16) are arranged sequentially along the radial direction of the body (11); Each of the annular grooves (16) is a V-shaped groove, and each of the annular grooves (16) has a first groove side surface (161) away from the axis of the body (11) and a second groove side surface (162) close to the axis of the body (11). The first groove side surface (161) is an arc-shaped surface, and the arc-shaped surface is recessed into the body (11).

2. The expanding lens (10) according to claim 1, characterized in that, From the center of the body (11) in a radially outward direction, the depth of the annular groove (16) decreases sequentially, and the bottom of all the annular grooves (16) is on the same straight line K, and the straight line K forms an acute angle A with the plane where the mounting surface (14) is located.

3. The expanding lens (10) according to claim 2, characterized in that, The acute angle A is 0.5° to 10°.

4. The expanding lens (10) according to claim 1, characterized in that, The second groove side (162) is parallel to the axis of the body (11).

5. The expanding lens (10) according to any one of claims 1 to 4, characterized in that, The depth of the light inlet hole (13) is H0, and the depth of the annular groove (16) is Hh, satisfying: Hh≤20%H0; And / or, the annular groove (16) has a width dimension Wh in the radial direction of the body (11), and the outer radius of the mounting surface (14) is R0, satisfying: 3%R0≤Wh≤20%R0.

6. The expanding lens (10) according to any one of claims 1 to 4, characterized in that, In a plane parallel to the mounting surface (14), the total projected area of ​​the mounting surface (14) where the annular groove (16) is not provided and the total projected area of ​​the annular groove (16) is provided is S0, and the total projected area of ​​the annular groove (16) is Sh, satisfying: 60%S0≤Sh≤90%S0.

7. The expanding lens (10) according to any one of claims 1 to 4, characterized in that, A group of protrusions is provided on the light-emitting surface (12). The group of protrusions includes a plurality of protrusions (17). The plurality of protrusions (17) are distributed along a spiral line on the light-emitting surface (12). The spiral line extends spirally from the center of the light-emitting surface (12) along the surface of the light-emitting surface (12) to the edge of the light-emitting surface (12).

8. The expanding lens (10) according to claim 7, characterized in that, Two sets of protrusions are provided on the light-emitting surface (12), namely a first set of protrusions and a second set of protrusions. There are two spirals, namely a first spiral (181) and a second spiral (182). The starting points of the first spiral (181) and the second spiral (182) are symmetrically distributed about the center of the light-emitting surface (12). The first set of protrusions is distributed along the first spiral (181) on the light-emitting surface (12), and the second set of protrusions is distributed along the second spiral (182) on the light-emitting surface (12). Among them, the surface of the protrusion (17) facing away from the body (11) is an outwardly convex arc surface; the plurality of protrusions (17) of the first protrusion group are connected in sequence along the first spiral line (181), the plurality of protrusions (17) of the second protrusion group are connected in sequence along the second spiral line (182), and the plurality of protrusions (17) of the first protrusion group and the plurality of protrusions (17) of the second protrusion group are connected in sequence from the center of the light-emitting surface (12) to the edge of the light-emitting surface (12).

9. A light source assembly (100), characterized in that, include: The expanding lens (10) as described in any one of claims 1 to 8; LED beads (21) are disposed in the light inlet (13); and The circuit board (22) is connected to the lamp bead (21) and contacts the mounting surface (14).

10. A display device, characterized in that, Includes the light source assembly (100) as described in claim 9.

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