Lens, backlight module and display device
By designing the light-incident and light-exit surfaces of the lens and controlling the light propagation path through refraction and reflection, the problem of brightness diffusion in Mini LED displays has been solved, improving dark-field details and image quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-26
- Publication Date
- 2026-04-10
AI Technical Summary
When displaying dark scenes, Mini LED displays are prone to brightness diffusion between bright and dark areas, resulting in halos around bright objects and affecting the display of details in dark scenes and the overall image quality.
Design a lens including an incident light surface, a first light-exiting surface, and a second light-exiting surface. By reasonably setting the included angle and optical structure, light is refracted or reflected inside the lens, concentrating the light propagation path and reducing halo phenomena.
It effectively reduces light scattering and diffusion, improving the display effect of dark field details and overall image quality, especially the clarity and uniformity in the brightness transition area.
Smart Images
Figure CN121832061A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of display, in particular to a lens, a backlight module and a display device. BACKGROUND
[0002] Mini LED backlight technology is a new type of display technology applied in the field of liquid crystal display in recent years, which usually uses light-emitting diodes with micron-level chip size as backlight source. Compared with traditional LED backlight, Mini LED has the characteristics of smaller lamp bead size and higher arrangement density, and can combine with the sub-area backlight control mode to finely adjust the backlight brightness, thereby having certain advantages in brightness, contrast and color gamut, and has become one of the important technical solutions in the current television display field.
[0003] However, the existing Mini LED display device is prone to brightness diffusion phenomenon between bright and dark areas when displaying dark field pictures, which causes halos around bright objects, thereby affecting the display effect of dark field details and overall picture quality performance. SUMMARY
[0004] The embodiments of the present application provide a lens, a backlight module and a display device to at least partially solve the above technical problems.
[0005] In order to achieve the above purpose, according to the first aspect of the present application, a lens is provided, comprising:
[0006] An incident surface configured to be arranged opposite to a light source; A first light exit surface arranged opposite to the incident surface in the direction of the optical axis of the lens; and A second light exit surface arranged opposite to the incident surface in the direction perpendicular to the optical axis, the second light exit surface has a contour line in any cross section passing through the optical axis, and the included angle between the tangent of any point on the contour line and the optical axis is 12°-90°. The second light exit surface is configured to refract or totally reflect the light rays from the light source to the first light exit surface when the light rays reach the second light exit surface.
[0007] In some embodiments, the lens further comprises a glue injection surface, which is located in the region between the first light exit surface and the second light exit surface.
[0008] In some embodiments, the second light exit surface is arranged around the first light exit surface.
[0009] In some embodiments, the light transmittance of the glue injection surface is less than the light transmittance of the first light exit surface and / or the second light exit surface.
[0010] In some embodiments, the glue injection surface is arranged around the first light exit surface.
[0011] In some embodiments, the glue injection surface is a frosted surface.
[0012] In some embodiments, the glue injection surface is covered with an optical shielding layer.
[0013] In some embodiments, a glue injection part is arranged protruding from the lens, and the glue injection surface is arranged on the glue injection part.
[0014] In some embodiments, the size of the glue injection surface along the optical axis is less than 1 / 8 of the overall thickness of the lens along the optical axis.
[0015] In some embodiments, the size of the glue injection surface along the optical axis is 0.3mm-1.0mm.
[0016] In some embodiments, the lens is a biconvex lens or a biconcave lens.
[0017] In some embodiments, the lens is a centrally symmetric structure.
[0018] According to a second aspect of the present application, a backlight module is provided, comprising a light source and the lens according to the above technical solution.
[0019] In some embodiments, the light source comprises a light emitting diode and a base, the light emitting diode is mounted on the base, and the base is provided with a plurality of micron-level grooves and / or protrusions on the side surface facing the light emitting diode.
[0020] In some embodiments, the light source is an SMD package product or a COB package product.
[0021] According to a third aspect of the present application, a display device is also provided, comprising the lens according to the above technical solution, or comprising the backlight module according to the above technical solution.
[0022] In the lens of the embodiments of the present application, by arranging the first light exit surface and the second light exit surface, the light passing through the lens peripheral region is refracted or reflected when reaching the second light exit surface, and is further converged towards the first light exit surface, thereby facilitating the light control of the outgoing light. Based on the above structural arrangement, the disorderly diffusion of light to the lens peripheral region can be reduced, which is conducive to alleviating the brightness diffusion phenomenon at the junction of bright and dark regions, and the halo around the bright object is not easy to produce, thereby facilitating the display effect of dark field details and the overall image quality performance.
[0023] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.
[0025] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.
[0026] Figure 1 is a structural schematic diagram of a lens provided in an exemplary embodiment of the present disclosure; Figure 2 is a sectional view of a lens provided in an exemplary embodiment of the present disclosure Figure 1 ; Figure 3 is a sectional view of a lens provided in an exemplary embodiment of the present disclosure Figure 2 .
[0027] Explanation of reference numerals: 10, light source; 11, light-emitting diode; 12, base; 100, light-incident surface; 200, first light-emitting surface; 300, second light-emitting surface; 310, contour line; 400, optical axis; 500, glue injection surface; 600, glue injection part. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the protection scope of the present application.
[0029] According to the first aspect of the present application, with reference to Figures 1 to 3 , the present disclosure provides a lens comprising a light-incident surface 100 and a light-emitting surface. In the present embodiment, a light source 10 is arranged on the light-incident surface 100 side of the lens and is arranged opposite to the light-incident surface 100. The light emitted by the light source 10 enters the inside of the lens through the light-incident surface 100 and is emitted to the outside through the light-emitting surface of the lens.
[0030] It should be understood that when the optical axis 400 of the lens is perpendicular to the horizontal plane, the light source 10 is located directly below the lens, the light-incident surface 100 is located on the lower surface of the lens, and the light-emitting surface is located on the upper surface of the lens. In this configuration, the light emitted by the light source 10 enters the lens from the light-incident surface 100, is refracted or reflected by the optical structure in the lens, and is finally emitted from the light-emitting surface, thereby achieving the desired optical effect.
[0031] In some embodiments, referring to Figure 1 and Figure 2 , the light exit surface includes a first light exit surface 200 and a second light exit surface 300. The first light exit surface 200 is disposed opposite to the light entrance surface 100 in the direction of the optical axis 400 of the lens, and the second light exit surface 300 is disposed opposite to the light entrance surface 100 in the direction perpendicular to the optical axis 400. Exemplarily, the second light exit surface 300 is a closed annular surface, and the first light exit surface 200 is located within the annular region surrounded by the second light exit surface 300.
[0032] For example, the first light exit surface 200 is the surface of the lens facing away from the light source 10, and the included angle between the first light exit surface 200 and the light source 10 is small. Due to the small included angle, the light emitted by the light source 10 can pass through with a small divergence angle, thereby effectively reducing the scattering of light, which is beneficial to avoid the light halo phenomenon of the light emitted by the first light exit surface 200. In this structure, the first light exit surface 200 is mainly responsible for more concentratedly emitting the light emitted by the light source 10 outward, thereby reducing the brightness diffusion in the dark field picture, and being beneficial to improve the picture quality, especially in the aspect of detail presentation, the halo effect can be weakened.
[0033] The second light exit surface 300 is located in the side area of the lens and surrounds the first light exit surface 200. Since the included angle between the second light exit surface 300 and the incident light is large, refraction or total reflection is easy to occur. The large included angle can cause the appearance of the light halo phenomenon, especially in the high brightness area, which is easy to make the light diffuse to the surrounding. In order to reduce the halo effect, the direction of the second light exit surface 300 is designed in this embodiment, so that the light passing through the second light exit surface 300 can be refracted to the side of the first light exit surface 200, thereby effectively guiding the light to return to the concentrated path and weakening the appearance of the light halo.
[0034] The design of this structure is helpful to control the halo effect through light guiding. Specifically, the first light exit surface 200 has a small included angle with the light source 10, so that the light can pass through more concentratedly, reducing the scattering angle of the light, thereby avoiding the excessive diffusion of the light and inhibiting the generation of the light halo. The annular structure and the relatively large refraction angle of the second light exit surface 300 can refract or totally reflect the light at a suitable angle, thereby guiding the light to return to the side of the first light exit surface 200, thereby effectively weakening the halo effect.
[0035] The first light exit surface 200 can be a plane, a curved surface or other suitable shape, such as a convex or concave design, to adapt to different optical requirements. The second light exit surface 300 can be designed with different curvatures or angles to adjust the refraction or reflection angle and thereby control the propagation path of the light. For example, the second light exit surface 300 can be designed as a concave or convex surface of different shapes to adapt to different light source 10 positions or display requirements.
[0036] In addition, the included angle between the first light exit surface 200 and the second light exit surface 300 can also be adjusted according to specific requirements. For example, the degree of refraction and the reflection path of the light can be accurately controlled by changing the radius of curvature of the second light exit surface 300 or adjusting the material properties (such as the refractive index, surface finish, etc.) of the second light exit surface 300. These adjustments can achieve different optical effects according to the requirements of specific embodiments, further improving the picture quality performance of the display device.
[0037] In some embodiments, with reference to Figure 1 and Figure 2 In any cross-section passing through the optical axis 400, the second light exit surface 300 has a contour line 310, and the included angle between the tangent at any point on the contour line 310 and the optical axis 400 is 12°-90°. This design is beneficial to adjusting the refraction path of the lens light, avoiding excessive scattering of the light when passing through the second light exit surface 300, thereby reducing the generation of the halo effect.
[0038] Specifically, the contour line 310 on the second light exit surface 300 can adjust the refraction angle of the light according to different included angles. When the included angle is small, the degree of refraction of the light is small, which can be more concentrated through the lens and maintain a low divergence angle; when the included angle is large, the degree of refraction of the light increases, which can better guide the light to refract in the direction of the first light exit surface 200. By reasonably designing the range of the included angle (12°-90°), the propagation path of the light can be effectively adjusted in different application scenarios, thereby controlling the refraction and reflection effects of the light and weakening or avoiding the halo effect.
[0039] For example, the included angle between the tangent at any point on the contour line 310 and the optical axis 400 is 12°, 15.3°, 19.7°, 22.1°, 26.8°, 30.5°, 34.2°, 38.9°, 41.6°, 45.1°, 49.8°, 52.4°, 56.7°, 60.2°, 63.9°, 67.5°, 71.1°, 74.8°, 78.3°, 81.6°, 84.2°, 86.9°, 88.5°, or 89°, which is not limited in the embodiments of the present application.
[0040] Exemplarily, the profile line 310 of the second light exit surface 300 is designed to have an included angle, which helps to effectively adjust the propagation path of the light when passing through the lens. By adjusting the range of the included angle (12° to 90°), the refraction direction of the light after entering the second light exit surface 300 can be accurately controlled. When the light passes through the second light exit surface 300 at a smaller included angle (such as 12°), the refraction angle is smaller, thereby avoiding excessive divergence of the light and reducing the halo effect. When the included angle increases (such as 90°), the refraction angle of the light also increases accordingly, and the light can be guided back to the target area by refraction or reflection, which helps to refocus the light and improve the display effect of dark field details.
[0041] Through the above design, the propagation path of the light can be flexibly adjusted in different optical environments, thereby optimizing the image quality under different display requirements. This structural design not only suppresses the halo effect, but also maintains good display effect, especially in high contrast and detail presentation.
[0042] In some embodiments, the second light exit surface 300 is configured to refract or totally reflect the light at the corresponding position to the first light exit surface 200 away from the light source 10 when the light from the light source 10 reaches the second light exit surface 300. Through this design, the second light exit surface 300 can effectively adjust the propagation direction of the light, avoiding excessive diffusion or halo phenomenon of the light.
[0043] Specifically, the design of the second light exit surface 300 aims to guide the passing light, especially the light emitted by the light source 10. Since the relative angle between the second light exit surface 300 and the light is large, the light will be refracted or reflected after contacting the second light exit surface 300. This process guides the light to the first light exit surface 200 of the lens, rather than continuing to diffuse outward.
[0044] By reasonably designing the refraction or reflection path of the second light exit surface 300, the light can be effectively concentrated and guided in the desired direction, avoiding disordered diffusion of the light, thereby benefiting the reduction or elimination of the halo effect and optimizing the display effect of dark field details.
[0045] In order to better achieve the above effects, the shape, angle or material of the second light exit surface 300 can be further adjusted. For example, the second light exit surface 300 can adopt a curved surface or an optical coating with a specific refractive index, which can more accurately control the refraction or reflection path of the light. Through different material selection or curvature design, more efficient light guidance can be achieved, thereby further reducing the halo and optimizing the display effect.
[0046] In some embodiments, the material of the lens can be silicone, transparent resin, etc., and is not limited thereto. According to the specific application requirements, other transparent materials with appropriate optical properties can be selected as the material of the lens to meet the optical effect and structural requirements.
[0047] In some embodiments, referring to Figure 1 and Figure 2 , the lens further includes a glue injection surface 500 located in the area between the first light exit surface 200 and the second light exit surface 300. Specifically, the lens is usually formed by an injection molding process, in which a glue injection port is formed. The area of the lens surface opposite to the glue injection port is the glue injection surface 500. Since the quality of the lens surface at the glue injection surface 500 is low, if it is arranged on the first light exit surface 200 or the second light exit surface 300, it may affect the transmission of light, thereby aggravating the halo effect. In order to avoid such an impact, the present embodiment arranges the lens in the area between the first light exit surface 200 and the second light exit surface 300, thereby effectively avoiding interference with the light transmission effect and reducing the halo effect.
[0048] In some embodiments, a demolding area is formed between the upper mold and the lower mold, and the corresponding lens surface of the demolding area is the glue injection surface 500. By arranging the glue injection surface 500 between the first light exit surface 200 and the second light exit surface 300, the smoothness of the lens surface and the high light transmittance can be maintained, and the scattering or uneven distribution of light caused by surface defects can be avoided, thereby optimizing the optical effect and reducing the halo phenomenon.
[0049] This design can reduce the impact of the glue injection port or the demolding surface on the optical performance during the production process, thereby benefiting the display effect, especially in terms of details and brightness transition, and improving the display effect of dark field details. Through this structure, the influence of optical defects on light transmission can be effectively avoided, the halo can be reduced, and the overall display quality can be enhanced.
[0050] In some embodiments, the lens surface corresponding to the glue injection port and / or the demolding area is the glue injection surface 500.
[0051] In some embodiments, referring to Figure 1 and Figure 2 , the second light exit surface 300 is arranged around the first light exit surface 200. Through this design, the second light exit surface 300 can effectively control the propagation direction of light, avoid excessive diffusion of light or halo phenomenon, and thereby improve the optical performance of the lens. Specifically, the position and shape of the second light exit surface 300 help to refract or reflect light towards the first light exit surface 200, further concentrating the light and optimizing the display effect.
[0052] In some embodiments, the light transmittance of the glue injection surface 500 is less than that of the first light exit surface 200 and / or the second light exit surface 300. Specifically, the light transmittance of the glue injection surface 500 is designed to be lower than that of other light exit surfaces, or the intensity of the transmitted light is reduced through light shielding treatment. This design is beneficial to reduce light scattering caused by poor surface quality of the glue injection surface 500, avoid the appearance of light halo, and thus optimize the optical effect of the lens.
[0053] The glue injection surface 500 is usually located between the first light exit surface 200 and the second light exit surface 300. During the production of the lens, due to the limitations of the mold and the injection molding process, the glue injection port and the demolding surface usually have rough or defective surfaces, resulting in low surface precision in these areas. If the glue injection surface 500 is in direct contact with the light exit surface, surface defects can cause light scattering, so that the light cannot be uniformly transmitted, thereby forming a light halo and affecting the display effect.
[0054] By setting the glue injection surface 500 between the first light exit surface 200 and the second light exit surface 300 and reducing its light transmittance or performing light shielding treatment, the influence of the glue injection surface 500 on the light transmission effect can be effectively reduced. This design can make the light more uniform when passing through the first light exit surface 200 and the second light exit surface 300, thereby avoiding the light halo phenomenon. Specifically, the low light transmittance of the glue injection surface 500 effectively blocks or guides the light passing through this area, making the transmission of light more concentrated and orderly, and reducing the influence of light scattering on the display effect.
[0055] In some embodiments, referring to Figure 1 and Figure 2 , the glue injection surface 500 is arranged around the first light exit surface 200. Through this design, the glue injection surface 500 can form a surrounding structure in the peripheral area of the lens, which is beneficial to control the propagation of light and reduce light scattering. Specifically, the glue injection surface 500 is located around the first light exit surface 200 and reduces its light transmittance or uses light shielding technology, which helps to reduce light scattering caused by surface defects, thereby optimizing the optical performance of the lens.
[0056] In some embodiments, the glue injection surface 500 is a frosted surface. By designing the glue injection surface 500 as a frosted surface, light scattering caused by uneven surface roughness can be effectively reduced, and the optical performance of the lens can be optimized. The frosted surface helps to make the light passing through the glue injection surface 500 more uniformly scattered, thereby reducing the light halo phenomenon and excessive divergence of light, and improving the overall display effect.
[0057] The glue injection surface 500 is usually formed during the lens production process, and its surface quality can be relatively low. If the surface of this area is smooth or not treated, it can cause uneven scattering of light when it passes through, resulting in a halo effect. By designing the glue injection surface 500 as a frosted surface, its light transmittance can be reduced, thereby reducing the halo effect and ultimately improving the display effect, especially in the dark field details and brightness transition areas.
[0058] Illustratively, a frosted surface refers to a structure that is rendered with tiny particles or irregular textures through physical or chemical treatment. In addition to traditional frosted treatment, the glue injection surface 500 can also be manufactured through other process methods, such as optimizing the surface texture through sandblasting, chemical etching, or microstructure design, etc.
[0059] In some embodiments, the glue injection surface 500 is covered with a light shielding layer. By covering the glue injection surface 500 with a light shielding layer, the scattering or transmission of light through the glue injection surface 500 can be effectively prevented, thereby reducing the halo phenomenon and unevenness of light caused by the poor surface quality of the glue injection surface 500. The design of the light shielding layer helps to ensure uniform distribution of light and avoid excessive divergence of light, thereby improving the overall display effect.
[0060] During the lens production process, the glue injection surface 500 can be uneven or have poor optical performance due to the design of the mold or the limitations of the injection molding process. If the glue injection surface 500 is not treated additionally, it can cause scattering of light when it passes through, thereby producing a halo effect and affecting the display effect. To solve this problem, covering the glue injection surface 500 with a light shielding layer can effectively reduce the interference of this area to light. The light shielding layer can prevent unnecessary scattering and transmission of light, ensuring that light is more concentrated in transmission through other optical areas of the lens, rather than being scattered or absorbed by the glue injection surface 500, thereby avoiding the generation of a halo phenomenon.
[0061] Through this design, the optical performance of the lens can be improved, the light transmission path can be optimized, and the display effect can be improved, especially in the details and brightness transition areas, avoiding unevenness of light or excessive diffusion of brightness, and ultimately providing a clearer and more accurate display effect.
[0062] Illustratively, the light shielding layer can be a thin film or coating with low light transmittance, covering the glue injection surface 500. The function of this light shielding layer is to prevent scattering or unnecessary transmission of light when it passes through the glue injection surface 500, ensuring that light is more concentrated when it passes through other optical areas of the lens, thereby avoiding affecting the display effect.
[0063] By covering the light-shielding layer, the scattering of light at the glue injection surface 500 can be reduced, making the propagation path of light more uniform, which is beneficial to reducing the halo effect and improving the overall display effect. The light-shielding layer can use different materials, such as black or dark optical coating, to achieve the best light-shielding effect.
[0064] The light-shielding layer can be made of various materials, such as black coating, metal film, or optical-grade opaque material, etc. These materials can effectively reduce the uneven distribution and scattering of light when it passes through the glue injection surface 500, ensuring the concentration of light when it passes through the lens. In addition to traditional coating methods, the light-shielding layer can also use other processes, such as evaporation plating, spraying, or electroplating, to achieve the coverage of the light-shielding layer. These processes can ensure that the light-shielding layer is evenly and stably distributed on the glue injection surface 500, thereby improving the overall optical effect.
[0065] In some embodiments, referring to Figure 1 and Figure 2 , the lens is provided with a glue injection part 600, and the glue injection surface 500 is arranged on the glue injection part 600. By arranging the glue injection surface 500 on the convex glue injection part 600, subsequent polishing and processing can be facilitated, while avoiding affecting the precision of the first light-emitting surface 200 and the second light-emitting surface 300 during processing of the glue injection part 600. This design is beneficial to improving the operability and precision control during lens manufacturing, ensuring that the optical performance of the lens is not affected.
[0066] During the production process of the lens, the glue injection part 600 often forms irregular surface areas due to the limitations of the mold or injection molding process. If the glue injection surface 500 directly contacts the first light-emitting surface 200 or the second light-emitting surface 300, it may affect the optical performance of the lens, especially during the processing process, which can easily cause damage or uneven surface treatment to the optical surface, thereby affecting the transmission path of light and the display effect.
[0067] By arranging the glue injection surface 500 on the convex glue injection part 600, the area can be polished and processed during the processing of the glue injection part 600, avoiding affecting the precision of the first light-emitting surface 200 and the second light-emitting surface 300. The convex design of the glue injection part 600 allows it to be finely processed separately, thereby improving the overall precision and stability of the lens, ensuring that the optical performance of the first light-emitting surface 200 and the second light-emitting surface 300 is not disturbed.
[0068] In some embodiments, the size of the glue injection surface 500 in the direction of the optical axis 400 is less than 1 / 8 of the overall thickness of the lens in the direction of the optical axis 400. By designing the glue injection surface 500 to be small in size, the influence of the glue injection part 600 on the overall optical performance of the lens can be effectively reduced, especially when the light passes through the lens, avoiding light scattering or uneven transmission caused by the glue injection surface 500 being too large. This design is beneficial to ensure the precision and optical effect of the lens, and to improve the uniformity of the display effect.
[0069] In some embodiments, the size of the glue injection surface 500 in the direction of the optical axis 400 is 0.3mm-1.0mm. By limiting the size of the glue injection surface 500 within this range, the influence of the glue injection part 600 on the overall optical performance of the lens can be effectively controlled, ensuring the uniformity and precision of the light passing through the lens. This design is beneficial to reduce light scattering and optical performance distortion caused by the glue injection surface 500 being too large or too small, and to improve the stability of the overall display effect.
[0070] For example, the size of the glue injection surface 500 in the direction of the optical axis 400 is 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.41mm, 0.44mm, 0.47mm, 0.5mm, 0.53mm, 0.56mm, 0.59mm, 0.62mm, 0.64mm, 0.67mm, 0.7mm, 0.72mm, 0.75mm, 0.78mm, 0.81mm, 0.83mm, 0.86mm, 0.89mm, 0.91mm, 0.93mm, 0.95mm, 0.97mm, 0.98mm, 0.99mm or 1.0mm, which is not limited in the embodiments of the present application.
[0071] In some embodiments, referring to Figure 2 and Figure 3 , the lens is a biconvex lens or a biconcave lens. By adopting a biconvex lens or a biconcave lens design, the optical performance of the lens can be optimized, the focusing and refraction effects of the light can be improved, and the clarity and uniformity of the display effect can be enhanced. This design is beneficial to reduce light scattering and improve the concentration of light, thereby enhancing the contrast and color performance of the display screen.
[0072] Specifically, the selection of the lens can be adjusted according to the number of backlights in the backlight module. When the number of backlights in the backlight module is large and the distance between adjacent backlights is close, the lens needs to be focused to reduce the halo effect, so a biconcave lens is used. When the number of backlights in the backlight module is small and the distance between adjacent backlights is large, a biconvex lens is used to ensure good backlight source 10.
[0073] When the number of backlights in the backlight module is large, the distance between adjacent backlights is small. In order to ensure that the light is concentrated and effectively irradiated to the target area, and to avoid the phenomenon of uneven brightness or halo caused by excessive divergence of light, a double-concave lens can effectively focus the light. The double-concave lens can make the light passing through the lens converge to the center through its concave design, thereby reducing the irradiation angle and improving the concentration of light. In this way, the light can be concentrated in the required area, reducing the halo effect and improving the overall display effect.
[0074] When the number of backlights in the backlight module is small, the distance between adjacent backlights is large. At this time, the light of the light source 10 is highly divergent, and in order to avoid uneven brightness distribution caused by too concentrated light, a double-convex lens can effectively diffuse the light and increase the irradiation angle. This design helps to evenly distribute the light source 10, ensuring the overall light coverage of the backlight module and avoiding strong halo effect in areas where light is too concentrated.
[0075] Both sides of the lens are concave, with strong light condensing ability. After the light passes through the lens, it will be refracted and converged by the concave surfaces on both sides, concentrating on the target area, thereby improving the concentration of light and reducing the irradiation angle, suitable for the case where the distance between adjacent backlights is small.
[0076] Both sides of the lens are convex, which can refract and disperse light, increase the irradiation angle, and are suitable for the case where the distance between adjacent backlights is large. By diffusing the light, the uniformity of the backlight light source 10 can be enhanced, ensuring extensive irradiation coverage and less halo effect.
[0077] In addition to double-concave and double-convex lenses, other shapes of lenses can also be used according to actual application requirements, such as spherical lenses, aspherical lenses or gradient lenses, etc., to further optimize the focusing or divergence effect of light. For example, an aspherical lens can control the refractive path of light by precisely designing its curvature, thereby achieving more precise light focusing or divergence.
[0078] In some embodiments, with reference to Figure 2 and Figure 3 , the lens is a center-symmetric structure. By designing the lens as a center-symmetric structure, the optical performance of both sides of the lens can be effectively balanced, ensuring the symmetry and uniformity of light when passing through the lens, thereby improving the stability and consistency of the display effect.
[0079] The center-symmetric structure means that the shape of the lens is symmetric with respect to its center point, i.e. each part of the lens has the same geometric shape and structural characteristics on both sides of the center point. This design can ensure that the light is uniformly refracted or transmitted on both sides during its passage through the lens, avoiding deviation of the light propagation path due to asymmetric lens shape.
[0080] With the central symmetry structure, the lens can better control the propagation path of light, ensuring that the light does not deviate or scatter when passing through the lens, and ensuring stable transmission of light. This is particularly important for applications that require high-precision optical effects, especially in backlight modules, where the central symmetry design of the lens helps to reduce the halo phenomenon and improve the uniformity of the display effect.
[0081] According to a second aspect of the present disclosure, a backlight module is provided, comprising a light source 10 and the lens in the above embodiments. The backlight module has all the beneficial effects of the above-mentioned lens, and the present disclosure will not be repeated here.
[0082] In some embodiments, referring to Figure 2 and Figure 3 Figure 2 Figure 3 , the light source 10 comprises a light-emitting diode 11 and a base 12, the light-emitting diode 11 is mounted on the base 12, and the base 12 is provided with a plurality of micron-level grooves and / or protrusions on the side surface facing the light-emitting diode 11. These micron-level groove and protrusion structures not only help to change the propagation path of light, but also can achieve diffuse reflection, thereby improving the illumination effect of the light source 10 and enhancing the overall optical performance of the backlight module.
[0083] In some embodiments, the light source 10 is an SMD package product or a COB package product.
[0084] In some embodiments, a deformation member is connected between the light source 10 and the lens. The deformation member is configured to adjust the distance between the light source 10 and the lens according to the principle of thermal expansion and contraction when the temperature changes. When the light source 10 emits light, the change in temperature will affect the refractive index, thereby causing the refraction effect of the light to change, thereby affecting the halo effect. Through the deformation member, the distance between the light source 10 and the lens can be actively adjusted when the temperature rises, thereby changing the incident angle and refraction effect of the light, effectively reducing the appearance of the halo phenomenon.
[0085] The deformation member can automatically adjust the distance between the light source 10 and the lens according to the principle of thermal expansion and contraction as the temperature changes. When the temperature rises, the deformation member will deform due to thermal expansion and contraction, causing the distance between the light source 10 and the lens to increase; conversely, when the temperature decreases, the deformation member will contract, causing the distance between the light source 10 and the lens to decrease. This dynamic adjustment helps to maintain the stability of the optical system under temperature changes and reduces the halo effect caused by temperature changes.
[0086] When the distance between the light source 10 and the lens changes, the incident angle of the light will change accordingly. Specifically, as the distance between the light source 10 and the lens increases, the angle of the light incident on the lens will also change, thereby changing the refraction path of the light. This adjustment can effectively reduce the excessive refraction of light caused by temperature rise, thereby reducing or avoiding the appearance of the halo phenomenon, and improving the clarity and uniformity of the display effect.
[0087] As the temperature rises, the heat generated by the light source 10 can cause the refractive index of the lens to change, which can cause uneven focusing or diffusion of light, resulting in a halo effect. By dynamically adjusting the deformation member, the distance between the light source 10 and the lens is actively adjusted when the temperature is high, which can optimize the incident angle of the light, effectively control the refraction effect of the light, and significantly reduce the impact of the halo effect.
[0088] The deformation member refers to a component that can deform, stretch or change its relative position when the temperature changes. It is usually made of materials with thermal expansion and contraction characteristics, such as metals or polymers, which can automatically adjust the distance between the light source 10 and the lens according to temperature changes.
[0089] In addition to common metal materials, the deformation member can also use high-performance plastics or composite materials, which also have good thermal expansion characteristics and can effectively respond to temperature changes. According to actual needs, selecting the appropriate material can optimize the performance of the deformation member and ensure stable optical effects.
[0090] According to a third aspect of the present disclosure, a display device is provided, comprising the lens in the above embodiments, or comprising the backlight module in the above embodiments. The display device has all the beneficial effects of the above lens or backlight module, and the present disclosure will not be repeated here.
[0091] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0092] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.
[0093] The embodiments, implementation methods and related technical features of the present application can be combined, replaced or modified without conflict.
[0094] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment based on the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.
Claims
1. A lens, characterized in that, include: The light-incident surface (100) is configured to be positioned opposite to the light source (10); The first light-emitting surface (200) is disposed opposite to the light-incident surface (100) in the direction of the optical axis (400) of the lens; and The second light-emitting surface (300) is disposed opposite to the light-incident surface (100) in the direction perpendicular to the optical axis (400). In any cross section passing through the optical axis (400), the second light-emitting surface (300) has a contour line (310). The angle between the tangent at any point on the contour line (310) and the optical axis (400) is 12°~90°. The second light-emitting surface (300) is configured such that when light from the light source (10) reaches the second light-emitting surface (300), the light at the corresponding position is refracted or totally reflected to the first light-emitting surface (200) on the side away from the light source (10).
2. The lens according to claim 1, characterized in that, The lens also includes a glue-filling surface (500), which is located in the area between the first light-emitting surface (200) and the second light-emitting surface (300); And / or, the second light-emitting surface (300) is disposed around the first light-emitting surface (200).
3. The lens according to claim 2, characterized in that, The light transmittance of the glue-filled surface (500) is less than that of the first light-emitting surface (200) and / or the second light-emitting surface (300).
4. The lens according to claim 2, characterized in that, The glue-filling surface (500) is arranged around the first light-emitting surface (200); And / or, the injection surface (500) is a frosted surface; And / or, the injection surface (500) is covered with a light-shielding layer; And / or, a glue injection portion (600) is provided protruding from the lens, and the glue injection surface (500) is provided on the glue injection portion (600).
5. The lens according to claim 2, characterized in that, The dimension of the injection surface (500) along the optical axis (400) is less than 1 / 8 of the overall thickness of the lens along the optical axis (400); And / or, the dimension of the injection surface (500) along the optical axis (400) is 0.3mm to 1.0mm.
6. The lens according to claim 1, characterized in that, The lens is a biconvex lens or a biconcave lens.
7. The lens according to claim 1, characterized in that, The lens has a centrally symmetrical structure.
8. A backlight module, characterized in that, It includes a light source (10) and a lens as described in any one of claims 1 to 7.
9. The backlight module according to claim 8, characterized in that, The light source (10) includes a light-emitting diode (11) and a base (12). The light-emitting diode (11) is mounted on the base (12), and the surface of the base (12) facing the light-emitting diode (11) is provided with several micron-sized grooves and / or protrusions. And / or, the light source (10) is an SMD packaged product or a COB packaged product.
10. A display device, characterized in that, It includes the lens as described in any one of claims 1 to 7, or the backlight module as described in claim 8 or 9.