Display apparatus

Abstract

The present application relates to a display apparatus. The display apparatus comprises a display panel and a backlight module, wherein the backlight module is provided with a plurality of optical lenses and a plurality of light sources. Light rays emitted by the light sources enter the optical lenses through the light incident surface of the optical lenses, are refracted by the optical lenses and then exit through the light exit surface. The area of the cross section of the light incident surface gradually decreases in the axial direction of the optical lenses from an opening corresponding to the light incident surface, and the cross section of the light incident surface and / or the cross section of the light emergent surface are / is non-circular, such that emergent light spots of the optical lens are presented in a non-circularly symmetrical distribution.

Description

Display device

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese patent application No. 2025108992323, filed on June 30, 2025; Chinese patent application No. 2025101922777, filed on February 20, 2025; and Chinese patent application No. 2024232058787, filed on December 24, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of display device technology, and more particularly to a display device. Background Technology

[0004] A backlight module is a light source supply device located on the light-emitting side of a display device. It is through the backlight module that the display panel in the display device can achieve its display function. Currently, display devices typically use direct-lit backlight modules. Direct-lit backlight modules use light-emitting components to provide light to the display panel, enabling the panel to display images. In related technologies, optical lenses are used in the light-emitting components of the backlight module to adjust the emission angle of the light-emitting components. However, the light spots formed by these optical lenses have a problem of difficulty in alignment during connection, affecting the display performance of the display device.

[0005] Public content

[0006] Some embodiments of this application provide a display device, including:

[0007] Display panel, used to display images;

[0008] A backlight module is located on the light-incident side of the display panel and is used to provide backlight for the display panel;

[0009] The backlight module includes:

[0010] Multiple light sources;

[0011] Multiple optical lenses are arranged on the light-incident side of the display panel closer to the light source. The concave surface of the optical lens facing the light source forms the light-incident surface, and the convex surface of the optical lens facing away from the light source forms the light-out surface. The light emitted by the light source enters the optical lens through the light-incident surface and exits from the light-out surface after being refracted by the optical lens.

[0012] The area of ​​the cross-section of the incident surface gradually decreases along the axis of the optical lens from the opening corresponding to the incident surface.

[0013] Wherein, the cross-section of the light-incident surface and / or the cross-section of the light-exit surface are non-circular, so that the emitted light spot of the optical lens presents a non-circular symmetrical distribution.

[0014] Some embodiments of this application provide a light mixing device, the device comprising:

[0015] support;

[0016] A light source, which is disposed on the bracket;

[0017] A light mixing element is disposed on the bracket. The light mixing element is frustum-shaped, and the peripheral wall of the light mixing element is a reflective wall. One axial end of the light mixing element is an injection end, and the other axial end is an emission end. The outer diameter of the injection end is larger than the outer diameter of the emission end.

[0018] The injection end is configured to allow light from the light source to enter the light mixing element.

[0019] Some embodiments of this application provide a lens for a light source assembly, including a lens body, the lens body being a plano-convex lens, the lens body having a convex surface and a bottom plane;

[0020] The lens body has a receiving groove and a reflecting groove recessed towards the interior of the lens body on the bottom plane;

[0021] The receiving groove is located in the middle of the bottom plane and is used to receive the light source assembly. The reflecting groove is located on at least one of the opposite sides of the receiving groove. The inner wall of the reflecting groove forms a reflecting surface, which is used to reflect the light rays from the light source assembly that are directed toward the reflecting groove. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in some embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying 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.

[0023] Figure 1 is a schematic diagram of the light spots when the light spots emitted from optical lenses of multiple related technologies provided in some embodiments of this application are joined together;

[0024] Figure 2 is a schematic structural diagram of a display device provided in some embodiments of this application;

[0025] Figure 3 is a schematic structural diagram of a light source and optical lens combination provided in some embodiments of this application;

[0026] Figure 4 is a schematic structural diagram of an optical lens provided in some embodiments of this application;

[0027] Figure 5 is a cross-sectional schematic diagram of the bottom surface of an optical lens provided in some embodiments of this application;

[0028] Figure 6 is a cross-sectional schematic diagram of the bottom surface of another optical lens provided in some embodiments of this application;

[0029] Figure 7 shows the illuminance distribution of an optical lens when the curvature at different points on the curve does not change monotonically along the curve direction, according to some embodiments of this application.

[0030] Figure 8 is a schematic diagram of the changes in the edge shape of the light spot provided in some embodiments of this application;

[0031] Figure 9 is a schematic diagram showing how the shape of the cross-section of the light-incident surface is obtained according to some embodiments of this application;

[0032] Figure 10 is a cross-sectional schematic diagram of an optical lens provided in some embodiments of this application;

[0033] Figure 11 is an illuminance distribution diagram of an optical lens when the distance between the second target point on the curve and the edge of the light source is 0.1 mm, according to some embodiments of this application.

[0034] Figure 12 is an illumination distribution diagram of an optical lens provided in some embodiments of this application when the radius of the rounded corner is less than or equal to one-quarter of the side length of the square;

[0035] Figure 13 is a schematic diagram of the light-emitting surface of an optical lens provided in some embodiments of this application;

[0036] Figure 14 is a cross-sectional view of an optical lens provided in some embodiments of this application along the diagonal;

[0037] Figure 15 is a cross-sectional view of an optical lens provided in some embodiments of this application along a vertical central symmetry line;

[0038] Figure 16 is a schematic diagram of the light spot after an optical lens is combined with a light source according to some embodiments of this application;

[0039] Figure 17 is a schematic diagram of the light spot after another optical lens is combined with a light source according to some embodiments of this application;

[0040] Figure 18 is a schematic diagram of the light spot after the optical lens of the related technology provided in some embodiments of this application is combined with a light source;

[0041] Figure 19 is a perspective view of a light mixing device (convex lens not shown) provided in some embodiments of this application;

[0042] Figure 20 is a top view of a light mixing device (convex lens not shown) provided in some embodiments of this application;

[0043] Figure 21 is a cross-sectional view along direction AA in Figure 20;

[0044] Figure 22 is a perspective view of the bracket provided in some embodiments of this application;

[0045] Figure 23 is a perspective view of a light mixing component provided in some embodiments of this application;

[0046] Figure 24 is a bottom view of a light mixing component provided in some embodiments of this application;

[0047] Figure 25 is a cross-sectional view along the BB direction of Figure 24;

[0048] Figure 26 is a perspective view of a light mixing device provided in some embodiments of this application;

[0049] Figure 27 is a top view of a light mixing device provided in some embodiments of this application;

[0050] Figure 28 is a cross-sectional view along the CC direction of Figure 27;

[0051] Figure 29 is a three-dimensional structural schematic diagram of a lens provided in some embodiments of this application;

[0052] Figure 30 is a cross-sectional structural diagram of a lens provided in some embodiments of this application; wherein, the light source assembly is located at the bottom of the receiving groove;

[0053] Figure 31 is a schematic diagram of light illumination from a light source assembly in a receiving groove according to some embodiments of this application;

[0054] Figure 32 is a schematic diagram of the connection structure between the bottom of the lens body and the light source assembly provided in some embodiments of this application;

[0055] Figure 33 is a schematic diagram of the bottom structure of the light source assembly and lens body structure provided in some embodiments of this application. Detailed Implementation

[0056] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0057] In some embodiments of this application, "display device" generally refers to a device with image display and data processing capabilities. For example, display devices include, but are not limited to, smart TVs, mobile terminals, computers, monitors, advertising screens, wearable devices, virtual reality devices, and augmented reality devices. The display device includes a backlight module and a display panel. In some embodiments of this application, the backlight module is a direct-lit backlight module, providing sufficient and uniformly distributed light to the display panel so that the display panel can display images normally. When the backlight source in the backlight module emits light using a combination of light-emitting components and optical lenses, the light-emitting angle of the light-emitting components is adjusted by the optical lenses. However, the light spots formed by the optical lenses in related technologies are circular, as shown in Figure 1. Taking the connection of four circular light spots as an example, the circular light spots are difficult to align during connection, and there is a problem of large gaps between adjacent light spots, affecting the display performance of the display device.

[0058] Therefore, proposing a display device that can solve the problem of difficulty in aligning light spots formed by optical lenses when they are joined in related display devices is a current technical problem to be solved. Some embodiments of this application provide a display device, as shown in Figures 2 and 3, including: a display panel 100 for displaying images; a backlight module 200 disposed on the light-incident side of the display panel 100 for providing backlight to the display panel 100; the backlight module 200 includes: a plurality of light sources 210; a plurality of optical lenses 220, wherein the optical lenses 220 are disposed closer to the light-incident side of the display panel 100 than the light sources 210, and the concave surface of the optical lens 220 facing the light source 210 constitutes a light-incident surface. 222, the convex surface of the optical lens 220 facing away from the light source 210 forms the light-emitting surface 224. The light emitted from the light source 210 enters the optical lens 220 through the light-incident surface 222, and exits from the light-emitting surface 224 after being refracted by the optical lens 220. The area of ​​the cross-section of the light-incident surface 222 gradually decreases along the axis of the optical lens from the opening corresponding to the light-incident surface 222. The cross-section of the light-incident surface 222 is composed of multiple curved segments, and the distance between different points on the curve and the center point of the cross-section varies along the direction of the curve.

[0059] In some embodiments, the type of light source 210 can be set according to actual conditions. In this application, LED chips are used as an example for the light source 210. It should be noted that the LED chip is a square LED chip, which is convenient for splicing multiple LED chips. The number of light sources 210 and optical lenses 220 can be set according to actual conditions, and is not limited in some embodiments of this application. In some embodiments, as shown in FIG2 and FIG3, the display device includes a display panel 100 and a backlight module 200. The backlight module 200 includes multiple light sources 210 and multiple optical lenses 220. Region 2A in FIG3 is used to characterize the light-emitting area of ​​the light source 210. The light sources 210 and optical lenses 220 are arranged in a one-to-one correspondence, so that the light emitted by the light source 210 is refracted by the light-incident surface 222 of the optical lens 220 and then diffused outward along the light-emitting surface 224 of the optical lens 220, thereby providing the display panel 100 with sufficient brightness and uniform light distribution so that the display panel 100 can display images normally. It should be noted that, as shown in Figure 4, the concave surface of the optical lens 220 facing the light source 210 constitutes the light-incident surface 222, and the convex surface of the optical lens 220 facing away from the light source 210 constitutes the light-exiting surface 224. The cross-sectional area of ​​the light-incident surface 222 gradually decreases along the axial direction of the optical lens from the opening corresponding to the light-incident surface 222. The light emitted by the light source 210 enters the optical lens 220 through the light-incident surface 222, and after being refracted by the optical lens 220, it exits from the light-exiting surface 224, thereby providing the display panel 100 with sufficient brightness and uniform light distribution so that the display panel 100 can display images normally.

[0060] Figure 5 provides an exemplary cross-sectional view of the bottom surface of the optical lens 220. Line 5A in Figure 5 is used to characterize the cross-section of the incident surface 222 (i.e., the intercept or outline of the incident surface 222 on the bottom surface). As shown in Figure 5, since the cross-section of the incident surface 222 is composed of multiple curved segments, and the distance between different points on the curve and the center point O of the cross-section varies along the curve direction, the light refraction angle corresponding to the incident position closer to the center point O is larger, and the corresponding outgoing optical path is longer, that is, the exit point position on the exiting surface 224 is farther away. Conversely, the light refraction angle corresponding to the incident position farther from the center point O is smaller, and the corresponding outgoing optical path is shorter, that is, the exit point position on the exiting surface 224 is closer. Therefore, after the light source 210 enters the optical lens 220 through the incident surface 222, the exit point position on the exiting surface 224 also varies in distance, so that the outgoing light spot, compared to a circular light spot, has an outward expansion and inward contraction at the edge, tending to a polygonal structure.

[0061] The aforementioned display device includes a display panel 100 and a backlight module 200. The backlight module 200 includes multiple light sources 210 and multiple optical lenses 220. Since the cross-section of the light incident surface 222 is formed by connecting multiple curves, and the distance between different points on the curve and the center point O of the cross-section varies along the curve direction, the position of the emission point of the light source 210 on the light emitting surface 224 after entering the optical lens 220 through the light incident surface 222 also varies from near to far. This causes the edge of the emitted light spot to expand outward and shrink inward, tending towards a polygonal structure. Compared with a circular light spot, the gap between two adjacent light spots is smaller when splicing polygonal light spots, thereby improving the light emission performance of the backlight module 200 and thus improving the display performance of the display device equipped with the backlight module.

[0062] In some embodiments, the distance between different points on the curve and the center point O of the cross-section varies monotonically along the curve direction. Specifically, as shown in Figure 6, taking two points d1 and d2 on the curve as examples, the distance between point d1 and point d2 on the curve and the center point O of the cross-section decreases monotonically. At this time, the light emitted by the light source 210 enters the optical lens 220 through the light-incident surface 222 and exits through the light-exit surface 224. The optical path gradually increases, and as the optical path gradually increases, the edge size of the light spot exiting through the optical lens 220 also gradually increases. Similarly, as the distance between different points on the curve and the center point O of the cross-section gradually increases, the light emitted by the light source 210, after being refracted by the optical lens 220, exits through the light-exit surface 224. The optical path gradually decreases, and as the optical path gradually decreases, the edge size of the light spot exiting through the optical lens 220 also gradually decreases. This causes the edge of the emitted light spot to expand outward and contract inward compared to a circular light spot, tending towards a polygonal structure. It should be noted that the distance between different points on the curve and the center point O of the cross-section changes monotonically along the curve direction. This can also be represented as the curvature corresponding to different points on the curve changing monotonically along the curve direction, as shown by line 6A in Figure 6. The curvature corresponding to points d1 to d2 gradually decreases. As the curvature gradually decreases, the light emitted from the light source enters the optical lens through the incident surface and exits through the exit surface, gradually increasing the optical path length, thus forming an equal illuminance distribution. At the same time, as the optical path length gradually increases, the edge size of the light spot exiting through the optical lens also gradually increases. Similarly, as the curvature gradually increases, the light emitted from the light source, after being refracted by the optical lens, gradually decreases the optical path length, thus forming an equal illuminance distribution. At the same time, as the optical path length gradually decreases, the edge size of the light spot exiting through the optical lens also gradually decreases. This results in the final light spot exiting through the optical lens having an outward and inward expansion and contraction at the edge compared to the circular light spot emitted from the light source, tending towards a polygonal structure.

[0063] Figure 7 exemplarily shows the illuminance distribution when the curvature at different points on the curve does not monotonically change along the curve direction. As can be seen from Figure 7, the light spot is deformed, and the uniformity and shape of the light spot differ significantly. In Figure 7, the vertical axis represents the illuminance value, the horizontal axis represents the length value, line 7A1 is the illuminance distribution curve in the horizontal direction, and line 7A2 is the illuminance distribution curve in the vertical direction. Due to symmetry, these two curves are basically consistent. In some embodiments of this application, the distance between different points on the curve and the center point O of the cross-section monotonically changes along the curve direction. This causes the light emitted from the light source 210 to be incident on the optical lens 220 through the light incident surface 222. After the light passes through the optical lens 220, the edge size of the light spot emitted from the optical lens 220 also monotonically changes. That is, the edge of the light spot expands and contracts, tending towards a polygonal structure. At the same time, the monotonous change of the curve makes the change in the edge size of the light spot smoother, which facilitates the connection of adjacent light spots, thereby improving the light emission performance of the backlight module and thus improving the display performance of the display device equipped with the backlight module.

[0064] In some embodiments, two connected curves on the cross-section of the light-incident surface 222 are arranged axially symmetrically, and the angle between the two ends of the curve and the center of symmetry O of the cross-section where the curve is located is 45 degrees. Specifically, as shown in Figure 6, points d1 and d2 are the two endpoints of the curve, and the angle between points d1 and d2 and the center of symmetry O of the cross-section where the curve is located is 45 degrees. It can be understood that the shape of the cross-section of the light-incident surface 222 is composed of 8 curves. At the same time, the two connected curves on the cross-section of the light-incident surface 222 are arranged axially symmetrically, that is, the distance between different points on the two connected curves on the cross-section of the light-incident surface 222 and the center point O of the cross-section first monotonically increases and then monotonically decreases in a clockwise direction, or first monotonically decreases and then monotonically increases. At this time, the edge of the light spot emitted by the optical lens 220 The edge shape can change from inward to outward, or from outward to inward. Taking the curve in Figure 6 as an example, the angle between points d1 and d3 and the center of symmetry O of the cross section where the curve is located is 90 degrees. The distance between different points on the curve between points d1 and d2 and the center point O is monotonically decreasing, while the distance between different points on the curve between points d2 and d3 and the center point O is monotonically increasing. Correspondingly, the shape of the light spot edge changes from outward to inward, forming an angle. This process is repeated, as shown in Figure 8. After the outward and inward changes, the shape of the light spot edge changes from a circle to a square.

[0065] For example, the shape (target shape) of the cross-section of the light-incident surface 222 can be obtained by the following steps, as shown in FIG9: symmetrically aligning the curve (the two endpoints of the curve are d1 and d2 respectively) along the diagonal l1, along the transverse centerline l2, and then along the longitudinal centerline l3 to obtain the target shape. In some embodiments of this application, the angle formed by the two ends of the two connected curves and the axisymmetric center of the cross-section is 90 degrees. Since the distance between different points on the curve and the center point of the cross-section changes monotonically along the curve direction, the edge size of the light spot first expands outward and then shrinks inward, thus forming an angle. Correspondingly, the light emitted by the light source, after being refracted by the optical lens, can form a light spot with four corners, that is, a quadrilateral light spot, which facilitates the connection of adjacent light spots, thereby improving the light-emitting performance of the backlight module and thus improving the display performance of the display device equipped with the backlight module.

[0066] In some embodiments, as shown in FIG10, the distance from the first target point d1 on the curve to the outer edge of the bottom surface where the opening is located is greater than or equal to a first predetermined length. The first target point is the point on the curve farthest from the center point O of the cross-section; the first predetermined length is 0.15 mm. Specifically, as shown in FIG10, the distance from the first target point d1 on the curve to the outer edge of the bottom surface where the opening is located is greater than or equal to 0.15 mm, and the first target point d1 is the point on the curve farthest from the center point O of the cross-section. If the distance from the first target point d1 to the outer edge of the bottom surface where the opening is located is less than 0.15 mm, the optical lens 220 does not meet the production injection molding conditions and cannot be mass-produced. In some embodiments of this application, the distance from the first target point d1 on the curve to the outer edge of the bottom surface where the opening is located is greater than or equal to 0.15 mm to meet the production injection molding conditions and facilitate mass production. In some embodiments, as shown in FIG10, the distance from the second target point d2 on the curve to the edge of the light source 210 is greater than or equal to a second predetermined length. The second target point d2 is the point on the curve closest to the center point O of the cross-section; the second predetermined length is 0.15 mm. It should be noted that the edge of the light source 210 is the edge of the light-emitting area corresponding to the light source 210. Specifically, as shown in Figure 10, the distance between the second target point d2 on the curve and the edge of the light source 210 is greater than or equal to 0.15 mm. If the distance between the second target point d2 on the curve and the edge of the light source 210 is less than 0.15 mm, light leakage will occur, thereby affecting the display performance of the display device.

[0067] Figure 11 exemplarily shows the illuminance distribution when the distance between the second target point d2 on the curve and the edge of the light source 210 is 0.1 mm. Figure 11 clearly shows a bright edge at the upper edge, indicating an uneven overall illuminance distribution. In Figure 11, the vertical axis represents the illuminance value, the horizontal axis represents the length value, line 11A1 is the illuminance distribution curve in the horizontal direction, and line 11A2 is the illuminance distribution curve in the vertical direction. Due to symmetry, these two curves are essentially identical. In some embodiments of this application, the distance between the second target point d2 on the curve and the edge of the light source 210 is greater than or equal to 0.15 mm to avoid light leakage and thus improve the display performance of the display device.

[0068] In some embodiments, as shown in FIG10, the cross-section of the light-emitting surface 224 is square, and rounded corners are provided between any two adjacent sides of the cross-section of the light-emitting surface 224. The radius r of the rounded corner is less than or equal to one-quarter of the side length a of the square. The side length of the cross-section of the light-emitting surface 224 can be set according to actual conditions and is not limited in some embodiments of this application. Specifically, as shown in FIG10, the cross-section of the light-emitting surface 224 is square, and rounded corners are provided between any two adjacent sides of the cross-section of the light-emitting surface 224. Simulation experiments were conducted by changing the radius of the rounded corners. Based on the experimental results, it can be seen that when the radius r of the rounded corner is greater than one-quarter of the side length a, the divergence angle of the light emitted by the light source 210 through the light-emitting surface 224 decreases, causing the four corners of the square light spot to be darker, affecting the display performance of the display device. For example, by rounding the corners of the optical lens 220 (rounded corners are provided between any two adjacent sides of the cross-section of the light-emitting surface), multiple internal reflections of light are prevented at the corners of the optical lens 220, while the edges of any cross-section smoothly transition between straight lines and arcs, and the light pattern is Lambertian.

[0069] Figure 12 exemplarily shows the illuminance distribution when the radius r of the rounded corner is less than or equal to one-quarter of the side length a of the square. As can be seen from Figure 12, the overall illuminance distribution of the light spot is relatively uniform. In Figure 12, the vertical axis represents the illuminance value, the horizontal axis represents the length value, line 12A1 is the illuminance distribution curve in the horizontal direction, and line 12A2 is the illuminance distribution curve in the vertical direction. Due to symmetry, these two curves are essentially identical. In some embodiments of this application, by constraining the relationship between the radius of the rounded corner and the side length of the square of the cross-section where the rounded corner is located, the edge of any cross-section smoothly transitions between straight lines and arcs, resulting in a Lambertian light pattern. This ensures uniform edge brightness of the light spot emitted through the optical lens, resulting in a uniform overall light spot brightness distribution after splicing, thus improving display performance.

[0070] In some embodiments, as shown in FIG13, the light-emitting surface 224 is a cross-shaped curved surface, which is composed of a concave surface with a smooth transition in the horizontal and vertical directions and a convex surface with a smooth transition between the concave surfaces in the horizontal and vertical directions; rounded corners are provided on the convex surface. Specifically, as shown in FIG13, the central part of the cross-shaped curved surface is a concave surface, and the light emitted by the light source 210 has a small divergence angle on the concave surface; the convex surface gradually bulges outward from the central part of the cross-shaped curved surface, with a smooth transition, and the light emitted by the light source 210 has a large divergence angle on the convex surface. The light emitted by the light source 210 diverges outward along the light-emitting surface, and the divergence angle continuously transitions from a small divergence angle at the central part of the cross-shaped curved surface to a large divergence angle at the rounded corner, thereby forming a square light spot. In some embodiments of this application, the light emitted by the light source 210 enters the optical lens 220 through the light incident surface 222 and diverges outward along the light emitting surface 224. The divergence angle of the light continuously transitions from a small divergence angle at the center of the cross-shaped curved surface to a large divergence angle at the rounded corner, thereby forming a square light spot. This facilitates the connection of adjacent light spots, thereby improving the light emission performance of the backlight module and thus improving the display performance of the display device equipped with the backlight module.

[0071] In some embodiments, as shown in Figure 10, the second target point d2 on the curve is located on the diagonal l4 of the cross-section of the curve. The second target point d2 is the point on the curve closest to the center point O of the cross-section, and the second target point d2 and the diagonal l4 are in the same plane. Specifically, as shown in Figure 10, the second target point d2 is the point on the curve closest to the center point O of the cross-section. The closer the incident light position is to the center point O, the larger the angle of refraction of the light rays, and the longer the corresponding outgoing light path. At the same time, both ends of the diagonal l4 of the cross-section of the light-emitting surface 224 are convex surfaces, with a large divergence angle, and the corresponding outgoing light path is long. The two superimposed superpositions better form a square light spot. It should be noted that since the angle between points d1 and d2 and the axisymmetric center O of the cross section where the curve is located is 45 degrees, and the first target point d1 is the point on the curve that is farthest from the center point O of the cross section, the light refracting angle corresponding to the incident light position is smaller the closer to the center point O, and the shorter the corresponding outgoing light path is. At the same time, the vertical central symmetry line l5 of the cross section of the light-emitting surface 224 all correspond to concave surfaces, with small divergence angles and short corresponding outgoing light paths. The two superimposed together better form a square light spot.

[0072] To facilitate understanding by those skilled in the art, the light refraction effect of the optical lens 220 is illustrated below with two specific examples. Figure 14 exemplarily shows a cross-sectional view of the optical lens 220 along the diagonal l4, and Figure 15 exemplarily shows a cross-sectional view of the optical lens 220 along the vertical central symmetry line l5. A comparison reveals that the outgoing optical path corresponding to the first target point d1 is relatively short, while the outgoing optical path corresponding to the second target point d2 is relatively long, thus better forming a square light spot. In some embodiments of this application, by setting the second target point d2 on the curve on the diagonal l4 of the cross-section of the curve, and the second target point d2 being the point on the curve closest to the center point O of the cross-section, the light emitted by the light source 210 experiences a larger refraction angle at the second target point d2 on the incident light surface 222, and a larger divergence angle at the convex surface of the exiting light surface 224, resulting in a longer outgoing optical path and better formation of a square light spot. This facilitates the connection of adjacent light spots, thereby improving the luminous performance of the backlight module and ultimately enhancing the display performance of the display device equipped with the backlight module.

[0073] Figure 16 exemplarily illustrates a schematic diagram of the light spot using the optical lens 220 provided in some embodiments of this application, paired with the light source 210. As shown in Figure 16, the overall light spot is square. Square light spots have advantages when arranging LEDs in a direct-lit display, resulting in more precise edge combination and splicing. In Figure 16, both the vertical and horizontal axes represent length values. It should be noted that, compared to optical lenses (circular lenses) in related technologies, the optical lens 220 provided in some embodiments of this application, with the same lens size (OD = 22 mm, where OD represents the distance from the upper surface of the aluminum substrate to the lower surface of the diffuser plate), has a light spot schematic diagram as shown in Figure 17. In Figure 17, the P:H ratio is 3:1. In the backlight module, H refers to the distance from the aluminum substrate to the diffuser plate, and P refers to the straight-line distance between two adjacent LEDs (light sources). A schematic diagram of the light spot of optical lenses in related technologies is shown in Figure 18, where the P:H ratio is 2.5:1. In Figures 17 and 18, both the vertical and horizontal axes represent length values. As can be seen from the above, the optical lens 220 provided in some embodiments of this application also amplifies the generated light spot, which can appropriately reduce the number of optical lenses and light sources in the backlight module, thereby reducing costs.

[0074] Some embodiments of this application also provide another display device, as shown in Figures 2 and 3, including: a display panel 100 for displaying images; a backlight module 200 disposed on the light-incident side of the display panel 100 for providing backlight to the display panel 100; the backlight module 200 includes: a plurality of light sources 210; a plurality of optical lenses 220, wherein the optical lenses 220 are disposed closer to the light-incident side of the display panel 100 relative to the light sources 210, and the concave surface of the optical lens 220 facing the light sources 210 forms a light-incident surface 222. The convex surface of 220 facing away from the light source 210 forms the light-emitting surface 224. The light emitted from the light source 210 enters the optical lens 220 through the light-incident surface 222 and exits from the light-emitting surface 224 after being refracted by the optical lens 220. The area of ​​the cross-section of the light-incident surface 222 gradually decreases along the axis of the optical lens from the opening corresponding to the light-incident surface 222. The cross-section of the light-emitting surface 224 is square, and rounded corners are provided between any two adjacent sides of the cross-section of the light-emitting surface 224. The radius of the rounded corners is less than or equal to one-quarter of the side length of the square.

[0075] In some embodiments, as shown in Figures 2 and 3, the display device includes a display panel 100 and a backlight module 200. The backlight module 200 includes a plurality of light sources 210 and a plurality of optical lenses 220. Region 2A in Figure 3 is used to characterize the light-emitting region of the light source 210. The light sources 210 and optical lenses 220 are arranged in a one-to-one correspondence, so that the light emitted by the light source 210 is refracted by the light-incident surface 222 of the optical lens 220 and then diffused outward along the light-outceasing surface 224 of the optical lens 220, thereby providing the display panel 100 with sufficient brightness and uniform light distribution so that the display panel 100 can display images normally. It should be noted that, as shown in Figure 10, the cross-section of the light-emitting surface 224 is square, and rounded corners are provided between any two adjacent sides of the cross-section of the light-emitting surface 224. Simulation experiments were conducted by changing the radius of the rounded corners. The experimental results show that when the radius r of the rounded corners is greater than one-quarter of the side length a, the divergence angle of the light emitted from the light source 210 through the light-emitting surface 224 decreases, causing the four corners of the square light spot to be darker, thus affecting the display performance of the display device. For example, by rounding the corners of the optical lens 220 (rounded corners are provided between any two adjacent sides of the cross-section of the light-emitting surface), multiple internal reflections of light at the corners of the optical lens 220 are prevented. Simultaneously, the edges of any cross-section smoothly transition between straight lines and curves, resulting in a Lambertian light pattern.

[0076] In the aforementioned display device, the backlight module 200 includes multiple optical lenses 220 and multiple light sources 210. Light emitted from the light source 210 is incident on the optical lens 220 through the light-incident surface 222, and after being refracted by the optical lens 220, it exits from the light-emitting surface 224. Since the cross-section of the light-emitting surface 224 is square, the light spot formed by the light source 210 through the square light-emitting surface 224 is also square. Compared with the circular light spot of related technologies, the square light spot is more conducive to splicing. In addition, rounded corners are provided between the two adjacent sides of the square, and the radius of the rounded corner r is less than or equal to one-quarter of the side length a of the square, so that the edge of any cross-section smoothly transitions between straight lines and arcs, the light pattern is Lambertian, and the edge brightness distribution of the emitted square light spot is uniform, thereby further ensuring the overall brightness uniformity when splicing the light spots, and thus improving the display performance of the display device.

[0077] In some embodiments, as shown in FIG13, the light-emitting surface 224 is a cross-shaped curved surface, which is composed of a concave surface with a smooth transition in the horizontal and vertical directions and a convex surface with a smooth transition between the concave surfaces in the horizontal and vertical directions; rounded corners are provided on the convex surface. Specifically, as shown in FIG13, the central part of the cross-shaped curved surface is a concave surface, and the light emitted by the light source 210 has a small divergence angle on the concave surface; the convex surface gradually bulges outward from the central part of the cross-shaped curved surface, with a smooth transition, and the light emitted by the light source 210 has a large divergence angle on the convex surface. The light emitted by the light source 210 diverges outward along the light-emitting surface, and the divergence angle continuously transitions from a small divergence angle at the central part of the cross-shaped curved surface to a large divergence angle at the rounded corner, thereby forming a square light spot. In some embodiments of this application, the light emitted by the light source 210 enters the optical lens 220 through the light incident surface 222 and diverges outward along the light emitting surface 224. The divergence angle of the light continuously transitions from a small divergence angle at the center of the cross-shaped curved surface to a large divergence angle at the rounded corner, thereby forming a square light spot. This facilitates the connection of adjacent light spots, thereby improving the light emission performance of the backlight module and thus improving the display performance of the display device equipped with the backlight module.

[0078] In related technologies, RGB LED chips typically include red, green, and blue LED chips. The red LED chip emits red light (R light), the green LED chip emits green light (G light), and the blue LED chip emits blue light (B light), meaning RGB LED chips can emit red, green, and blue light. However, because optical devices such as lenses and reflectors have different transmittance or reflectance for different colors of light, the light emitted by RGB LED chips, after being transmitted or reflected by these devices, causes some colors to increase in intensity while others decrease in intensity. This disrupts the original color balance of the RGB LED chips, resulting in color cast and uneven light mixing. In view of the above-mentioned problems, some embodiments of this application provide a light mixing device to solve the problems of color cast and uneven light mixing in related technologies.

[0079] In some embodiments, as shown in Figures 19, 20, and 21, the light mixing device 2100 includes a support 1 and a light source 2, wherein, as shown in Figures 21 and 22, the light source 2 is disposed on the support 1. This arrangement allows the support 1 to provide stable support and a fixed position for the light source 2, which helps to prevent the position of the light source 2 from shifting due to movement, vibration, or external interference of the device, thereby ensuring that the light is emitted normally according to the design requirements. In some embodiments, as shown in Figures 19, 20 and 21, the light mixing device 2100 further includes a light mixing element 3, which is disposed on the support 1. The light mixing element 3 is frustum-shaped, as shown in Figures 23, 24 and 25. The peripheral wall 31 of the light mixing element 3 is a reflective wall. One end of the light mixing element 3 along the axial direction (Y direction in Figure 25) is the injection end 32, and the other end along the axial direction is the emission end 33. The outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33. The injection end 32 allows light from the light source 2 to enter the light mixing element 3, and the emission end 33 allows light from inside the light mixing element 3 to exit the light mixing element 3. With this configuration, since one axial end of the frustum-shaped light mixing element 3 is the injection end 32 and the other axial end is the emission end 33, and since the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED enters the light mixing element 3 through the injection end 32, and the three-color light will be directed toward the peripheral wall 31 of the light mixing element 3. Since the peripheral wall 31 of the frustum-shaped light mixing element is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light, thereby facilitating the full mixing of the three-color light and helping to achieve a relatively balanced state of intensity of the three-color light, thus helping to solve the problems of color deviation and uneven light mixing.

[0080] In some embodiments, as shown in Figures 19, 20, and 21, the light mixing device 2100 includes a support 1, a light source 2, and a light mixing element 3. As shown in Figures 21 and 22, the light source 2 is disposed on the support 1. The light mixing element 3 is disposed on the support 1 and is frustoconical in shape, as shown in Figures 23, 24, and 25. The peripheral wall 31 of the light mixing element 3 is a reflective wall. One axial end (Y direction in Figure 25) of the light mixing element 3 is an injection end 32, and the other axial end is an emission end 33. The outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33. The injection end 32 allows light from the light source 2 to enter the light mixing element 3, and the emission end 33 allows light from within the light mixing element 3 to exit the light mixing element 3. With this configuration, since one axial end of the frustum-shaped light mixing element 3 is the injection end 32 and the other axial end is the emission end 33, and since the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED enters the light mixing element 3 through the injection end 32, and the three-color light will be directed toward the peripheral wall 31 of the light mixing element 3. Since the peripheral wall 31 of the frustum-shaped light mixing element is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light, thereby facilitating the full mixing of the three-color light and helping to achieve a relatively balanced state of intensity of the three-color light, thus helping to solve the problems of color deviation and uneven light mixing. In some embodiments, as shown in Figures 19, 20, and 21, the light mixing device 2100 further includes a light mixing element 3, which is disposed on the support 1. The light mixing element 3 is frustum-shaped, as shown in Figures 23, 24, and 25. The peripheral wall 31 of the light mixing element 3 is a reflective wall. One end of the light mixing element 3 along the axial direction (Y direction in Figure 25) is an injection end 32, and the other end along the axial direction is an emission end 33. The outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33. Along the axial direction of the light mixing element 3 (Y direction in Figure 21), the light source 2 is disposed on the side of the light mixing element 3 near the injection end 32. With this configuration, since one axial end of the frustum-shaped light mixing element 3 is the injection end 32 and the other axial end is the emission end 33, and since the light source 2 is positioned on the side of the light mixing element 3 closer to the injection end 32 along the axial direction of the light mixing element 3, and the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED can enter the light mixing element 3 through the injection end 32. After entering the light mixing element 3, the three-color light will be directed toward the peripheral wall 31 of the light mixing element 3. Since the peripheral wall 31 of the frustum-shaped light mixing element 3 is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light. This is conducive to fully mixing the three-color light and to achieving a relatively balanced state of intensity of the three-color light, thereby helping to solve the problems of color deviation and uneven light mixing.

[0081] In some embodiments, as shown in Figures 19, 20, and 21, the light mixing device 2100 includes a support 1, a light source 2, and a light mixing element 3. As shown in Figures 21 and 22, the light source 2 is disposed on the support 1. The light mixing element 3 is disposed on the support 1 and is frustoconical in shape, as shown in Figures 23, 24, and 25. The peripheral wall 31 of the light mixing element 3 is a reflective wall. One end of the light mixing element 3 along its axial direction (Y direction in Figure 25) is an injection end 32, and the other end along its axial direction is an emission end 33. The outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33. Along the axial direction of the light mixing element 3 (Y direction in Figure 21), the light source 2 is disposed on the side of the light mixing element 3 closer to the injection end 32. With this configuration, since one axial end of the frustum-shaped light mixer 3 is the injection end 32 and the other axial end is the emission end 33, and since the light source 2 is positioned on the side of the light mixer 3 closer to the injection end 32 along its axial direction, and the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED can enter the light mixer 3 through the injection end 32. After entering the light mixer 3, the three-color light will be directed towards the peripheral wall 31 of the light mixer 3. Since the peripheral wall 31 of the frustum-shaped light mixer 3 is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a continuous stirring of the light, which can disrupt and average the propagation path of the three-color light, thereby facilitating the thorough mixing of the three-color light and achieving a relatively balanced state of intensity. This, in turn, helps to solve the problems of color distortion and uneven light mixing. In some embodiments, the light source 2 is an organic light-emitting diode (OLED) or a quantum dot light-emitting diode (QLED). The type of light source 2 can be flexibly selected, specifically according to the application scenario of the light mixing device 2100. Some embodiments of this application do not specifically limit this. In some embodiments, as shown in FIG23, the end face of the emission end 33 is a frosted surface. With this configuration, since the mixed light will be emitted from the light mixing element 3 through the end face of the emission end 33, setting the end face of the emission end 33 to a frosted surface will cause the light to diffuse in all directions when the mixed light reaches the frosted surface, that is, to scatter the emitted light. This is similar to breaking up a concentrated beam of light, so that the light can be more evenly distributed over a larger angle range after emission. In some embodiments, the end face of the emission end 33 is a smooth surface. With this configuration, since the structure of the end face of the emission end 33 can be simplified, the processing of the end face of the emission end 33 can be simplified to a certain extent, which is beneficial to facilitating the processing of the end face of the emission end 33.

[0082] In some embodiments, as shown in Figures 21 and 25, the light mixing element 3 is a hollow light mixing shell, which surrounds a light mixing cavity 34, which is frustum-shaped. This arrangement serves two purposes: firstly, since the light mixing cavity 34 surrounded by the light mixing shell is also frustum-shaped, and secondly, since the peripheral wall 31 of the frustum-shaped light mixing element 3 is a reflective wall, the inner peripheral wall of the light mixing cavity 34 is also a reflective wall. Thus, after light enters the light mixing cavity 34 from the injection end 32, it is continuously reflected on the inner peripheral wall of the light mixing cavity 34 during its propagation towards the emission end 33. Furthermore, the light reflected from different positions intersects and mixes within the light mixing cavity 34. This multiple reflections and cross-mixing within the hollow cavity, to a certain extent, is more conducive to the uniform mixing of different colors of light compared to a solid structure, thereby further optimizing the light mixing effect and reducing color cast and unevenness in the light mixing. In some embodiments, the light mixing element 3 is a solid element. This design simplifies the structure of the light mixing element 3 to some extent, which in turn facilitates its processing and manufacturing.

[0083] In some embodiments, as shown in Figures 24 and 25, an injection port 321 is provided on the end face of the injection end 32. The injection port 321 communicates with the mixing cavity 34, and the injection port 321 allows light from the light source 2 to enter the mixing cavity 34. This configuration has two advantages: First, since all light emitted from the light source 2 enters the mixing cavity 34 through the injection port 321, the injection port 321 allows the light emitted from the light source 2 to enter the mixing cavity 34 in a concentrated manner, which helps to avoid the light entering the mixing cavity 34 in a relatively dispersed manner. This, in turn, helps to make the initial light distribution within the mixing cavity 34 more uniform, thus laying a good foundation for subsequent uniform light mixing. Second, since the injection port 321 can restrict the position of light entering the mixing cavity 34, it can, to a certain extent, limit the initial movement position and direction of light within the mixing cavity 34. This helps to make the reflection and mixing process of light within the mixing cavity 34 more orderly, thereby improving the mixing efficiency between different colors of light and further reducing the possibility of color cast and uneven light mixing. In some embodiments, the light mixing cavity 34 can be isolated from the external space of the light mixing component 3 by the end face of the injection end 32, the end face of the emission end 33, and the peripheral wall 31, that is, the light mixing cavity 34 is a closed chamber. Setting the light mixing cavity 34 as a closed chamber can effectively avoid interference from external factors on light mixing, thereby helping to make the light ratio and color more accurate.

[0084] In some embodiments, the light mixing element 3 is a transparent element, and a reflective layer is provided on the peripheral wall 31 of the light mixing element 3. The reflective layer is used to reflect the light inside the light mixing element 3. With this configuration, since the light mixing element 3 is a transparent element, and since the transparent material allows light to pass through relatively smoothly, the energy loss of light when passing through the light mixing element 3 is relatively small, and excessive energy loss is not due to absorption by the material itself. In addition, the reflective layer on the peripheral wall 31 of the light mixing element 3 ensures that the peripheral wall 31 of the light mixing element 3 has normal reflective function. In some embodiments, the emission end 33 is transparent, and the peripheral wall 31 of the light mixing element 3 is opaque and reflective. In this case, there is no need to provide a reflective layer on the peripheral wall 31. When the end face of the injection end 32 is provided with an injection port 321, the injection end 32 is opaque or transparent; when the end face of the injection end 32 is a complete end face that closes the light mixing cavity 34, the injection end 32 is transparent. This configuration not only ensures that light can enter and exit the light mixing element 3 normally and that light mixing can be completed within the light mixing element 3, but also that the reflective peripheral wall 31 simplifies the configuration of the peripheral wall 31 and facilitates its processing.

[0085] In some embodiments, the light mixing element 3 is a polymethyl methacrylate (PMMA) element or a polycarbonate element. This configuration, due to the good optical transparency of PMMA and polycarbonate (PC), allows for less energy loss when light passes through the light mixing element 3, creating better conditions for the subsequent light mixing process. Furthermore, this good optical transparency helps maintain the intensity and color purity of the light, which is helpful in reducing color distortion problems during light mixing. In some embodiments, the light mixing element 3 can be made of any other transparent material. The material selection for the light mixing element 3 is flexible and can be chosen according to actual usage requirements. Some embodiments of this application do not specifically limit this choice.

[0086] In some embodiments, the reflective layer is an aluminum layer. This configuration has several advantages. First, aluminum has extremely high reflectivity, so when light propagates through the mixing element 3 and reaches the aluminum layer, most of the light is efficiently reflected. This enhances the mixing effect within the mixing cavity 34, improves the uniformity of light mixing, and further reduces color distortion and uneven light mixing. Second, aluminum forms a dense aluminum oxide film in the air, which effectively protects the aluminum layer from further oxidation or corrosion. During the use of the light mixing device 2100, even under different environmental conditions, such as humid environments or atmospheres containing small amounts of chemicals, the aluminum reflective layer maintains stable performance. This ensures the durability of the reflective properties of the reflective layer, thereby guaranteeing the long-term stable operation of the light mixing device 2100.

[0087] In some embodiments, the reflective layer is a silver layer. This configuration is advantageous because silver is a material with extremely high reflectivity, reaching approximately 95% in the visible light range. This means that when a silver reflective layer is used on the peripheral wall 31 of the light mixing element 3, the silver layer can reflect the vast majority of light during reflection within the light mixing cavity 34, reducing light absorption loss and thus improving light mixing efficiency. In some embodiments, the reflective layer can be made of any other reflective material. The choice of material for the reflective layer is flexible; specifically, it can be selected according to actual needs, and some embodiments of this application do not specifically limit this selection.

[0088] In some embodiments, as shown in Figures 26 and 27, the light mixing device 2100 further includes a convex lens 4, as shown in Figure 28, which is disposed on the outside of the light mixing element 3. This arrangement serves two purposes: firstly, since the convex lens 4 has the characteristic of converging light, it can focus the light emitted from the light mixing element 3, thereby concentrating the energy distribution of the light and improving the intensity of the light in the target area. Secondly, as a component disposed on the outside of the light mixing element 3, the convex lens 4 provides physical protection for the light mixing element 3, preventing dust, moisture, and other external impurities from directly contacting it and avoiding the impact of impurities on the optical performance of the light mixing element 3.

[0089] Some embodiments of this application also provide a backlight display device, as shown in Figures 26 and 27. This backlight display device includes a light mixing device 2100. The light mixing device 2100 has the same structure as any of the light mixing devices 2100 in the above embodiments and can bring the same or similar beneficial effects. For details, please refer to the descriptions in the above embodiments; these will not be repeated here. With this configuration, the light mixing device 2100 can effectively solve the problems of light mixing color shift and unevenness, thus helping to ensure that the different colors of light emitted by the backlight source are highly consistent in intensity. This makes the color performance of different areas of the screen uniform and consistent when displaying various images, without local color shift or uneven brightness, presenting users with a more realistic and delicate image effect.

[0090] For ease of description, unless otherwise specified, some embodiments of this application use the lens's position when in use as a reference for directions such as up, down, left, right, front, and back. The lens's front is considered the front, the opposite direction is the back, and the vertical direction is the up-down direction. In related technologies, LED light sources are usually used with lenses to diffuse light, improve light distribution, and optimize visual effects. LED light sources include multiple linearly arranged light-emitting chips. Because the central light-emitting chip and the chips on either side of the LED light source are located in different positions within the lens, some of the light emitted by the chips on the sides will exit from the sides of the lens at a larger emission angle, resulting in low light convergence efficiency. After passing through the lens, uneven color distribution and localized color overlap occur, leading to poor light mixing effects. Based on this, in order to solve the above problems, some embodiments of this application design a lens. By setting a reflective groove on the bottom plane of the lens body, the reflective groove is formed inside the lens body and communicates with the outside air. The inner wall of the reflective groove forms a reflective surface. Based on the total internal reflection theorem, light rays with large emission angles on both sides of the light source assembly are reflected by the reflective surface after being incident from the inside of the lens body onto the reflective groove and emitted out of the lens body at a smaller emission angle. This can better constrain the light rays with large emission angles on both sides, uniformize the light, and improve the light mixing effect.

[0091] Referring to Figures 29, 30, and 31, some embodiments of this application provide a lens 3100 for housing a light source assembly 203. The lens 3100 includes a lens body 103, which is a plano-convex lens. The lens body 103 has a convex surface 101 and a bottom surface 102. The lens body 103 has a receiving groove 303 and a reflecting groove 403 recessed towards the interior of the lens body 103 on the bottom surface 102. The receiving groove 303 is located in the center of the bottom surface 102 and is used to receive the light source assembly 203. The reflecting groove 403 is located on at least one of the opposite sides of the receiving groove 303. The inner wall of the reflecting groove 403 forms a reflecting surface 401, which reflects light emitted from the light source assembly 203 towards the reflecting groove 403. It is understood that the lens 3100 of this application is specifically applied in an LED multi-color light source device, where the light source assembly 203 includes multi-color LED chips, which are combined to present rich color effects. The light source assembly 203 is housed in the receiving groove 303 of the lens body 103. The lens body 103 is used to diffuse and homogenize the light from the light source assembly 203, thereby improving the light distribution and uniform light color. Specifically, the reflection groove 403 is formed inside the lens body 103 and located on one side of the receiving groove 303. The reflection groove 403 is connected to the outside air. Based on the total internal reflection theorem: when light travels from the optically denser medium (lens body 103) to the optically less dense medium (air in the reflection groove 403), and the angle of incidence is greater than or equal to the critical angle, the light will not enter the optically less dense medium. The light will be completely reflected back into the original medium, and there will be no more refraction. Therefore, the light rays from both sides of the light source assembly 203 that travel through the lens body 103 to the reflection groove 403 will be reflected by the reflecting surface 401 of the reflection groove 403 and emitted again from the lens body 103. The light rays will then exit the lens body 103 at a smaller emission angle. Referring to Figure 31, the light emission angle is the angle between the light ray and the bottom plane 102, and this angle is greater than or equal to 90°.

[0092] In some embodiments of this application, the lens 3100 has a reflective groove 403 formed on the bottom plane 102 of the lens body 103. The reflective groove 403 is formed inside the lens body 103 and communicates with the outside air. The inner wall of the reflective groove 403 forms a reflective surface 401. Based on the total internal reflection theorem, light rays with large emission angles on both sides of the light source assembly 203 are reflected by the reflective surface 401 after being emitted from the inside of the lens body 103 to the outside through the lens body 103. This can better constrain the light rays with large emission angles on both sides, so that the light rays emitted from the light source assembly 203 after passing through the lens body 103 have a uniform color and more uniform light mixing.

[0093] Referring to Figures 30 and 31, in some embodiments, the reflective surface 401 is inclined, and the end of the reflective surface 401 closer to the bottom plane 102 is closer to the receiving groove 303 than the end farther from the bottom plane 102; a first included angle aa is formed between the reflective surface 401 and the bottom plane 102. Specifically, since the reflective surface 401 is inclined, and the bottom end of the reflective surface 401 is closer to the receiving groove 303 than the top end of the reflective surface 401, then referring to Figure 31, the light emitted by the light source assembly 203 towards the reflective surface 401, after reflection, will be emitted from the lens body 103 to the outside at a smaller emission angle, effectively constraining the emission angle of the light on both sides of the light source assembly 203. In some embodiments, the angle range of the first included angle aa is 45°-60°. In related technologies, when total internal reflection occurs, the critical angle is the angle of incidence that minimizes the occurrence of total internal reflection. Taking visible light entering air (or vacuum) from glass (lens) as an example, the critical angle is approximately 41.5°. Therefore, the angle of incidence of light rays hitting the reflecting surface 401 must be no less than 41.5°. Furthermore, to ensure the reflective effect of the reflecting surface 401, it needs to be tilted relative to the bottom plane 102, and the angle of the first included angle aa must not exceed 90°. Exemplarily, some embodiments of this application set the angle of the first included angle aa to a range of 45°-60°, so that the reflecting surface 401 is at a suitable angle to satisfy the reflective effect of light. Specifically, the angle of the first included angle aa is 45°, 46°, 48°, 50°, 52°, 54°, 56°, 58°, 60°, etc.

[0094] Referring to Figure 31, in some embodiments, the depth of the reflective groove 403 recessed from the bottom plane 102 toward the interior of the lens body 103 is L1, and the maximum thickness of the lens body 103 is T1; wherein, L1 < 1 / 3T1. Understandably, the purpose of the reflective surface 401 is to reflect light rays with large emission angles on both sides of the light source assembly 203; however, if the height of the reflective groove 403 is too high, it will reflect some light rays at normal emission angles, preventing some light from escaping, resulting in a narrow light spot angle and affecting the illumination effect. Therefore, the depth L1 of the reflective groove 403 is set to be less than 1 / 3 of the maximum thickness of the lens body 103, so that the reflective surface 401 reflects light rays with large emission angles on both sides of the light source assembly 203 without affecting light rays at normal emission angles. Referring to Figures 30 and 31, in some embodiments, the cross-sectional shape of the reflective groove 403 is triangular, and the cross-sectional width of the reflective groove 403 gradually decreases from the bottom plane 102 toward the interior of the lens body 103. The reflective groove 403 has a triangular cross-sectional shape, which facilitates its fabrication. Understandably, the lens body 103 is a plano-convex lens, and the width of the lens body 103 gradually decreases from bottom to top of the bottom plane 102. Similarly, the cross-sectional width of the reflective groove 403 gradually decreases from bottom to top of the bottom plane 102, thus maintaining consistency with the width of the lens body 103. This reduces the space occupied by the reflective groove 403 within the lens body 103 and does not affect the light transmission of the light-transmitting body 1 to the light source assembly 203. Referring to Figure 30, in some embodiments, the reflective groove 403 has a right-angled triangular cross-sectional shape, and the reflecting surface 401 forms the hypotenuse of the right-angled triangle. Specifically, the cross-sectional shape of the reflective groove 403 is a right triangle. The relationship between the lengths of the three sides of the right triangle satisfies the Pythagorean theorem. Therefore, by setting the length of one of the right-angled sides, the depth of the reflective groove 403 can be directly set. By setting the length of the other right-angled side, that is, setting the length of the reflective surface 401 and the angle of the first included angle aa, the height of the reflective groove 403, the length of the reflective surface 401, and the angle of the first included angle aa can all be calculated and designed, making the structural design simpler.

[0095] Referring to Figures 30 and 32, in some embodiments, the light source assembly 203 includes an LED module 21, which includes at least three LED chips 2101 arranged along a first direction X; the receiving groove 303 has reflective grooves 403 on both opposite sides in the first direction X. The LED module 21 includes at least three LED chips 2101, and each LED chip 2101 is capable of emitting at least red, green, and blue light respectively. Understandably, based on the RGB (Red, Green, Blue) three-primary-color principle, a light source composed of red, green, and blue LED chips flows through three independent current channels, respectively, to the red, green, and blue LED chips. By controlling the magnitude of the current, the color and brightness are adjusted, and finally, through the human eye's perception of different colors and brightness, a rich color effect is presented. Adding white or other colored LED chips to the base of red, green, and blue colors can further expand the color range. Each LED chip 2101 is arranged along a first direction X, which is the X direction shown in the figure. Due to the different arrangement directions, after light is emitted through a conventional lens, uneven color overlap will occur in some areas. For example, if the LED module 21 includes LED chips 2101 of red, green and blue light, after the red LED chip 2101 located on one side of the first direction X emits light, more red light will be transmitted on the corresponding side, and after the blue LED chip 2101 located on the other side of the first direction X emits light, more blue light will be transmitted on the corresponding side, resulting in poor light mixing effect. However, some embodiments of this application provide reflective grooves 403 on both sides of the receiving groove 303 along the first direction X. The reflective grooves 403 on both sides can reflect the light emitted by the LED chips 2101 located on both sides of the first direction X, so that the light lens body 103 is directed to the outside; thereby constraining the light emitted by the LED chips 2101 on both sides with larger emission angles, so that the light mixing of each color LED chip 2101 is more uniform.

[0096] Referring to Figures 32 and 33, in some embodiments, the light source assembly 203 of this application further includes a chip carrier 22 disposed in a receiving groove 303. One end of the chip carrier 22 facing the receiving groove 303 has a mounting groove 2201, and each LED chip 2101 is disposed in the mounting groove 2201 along a first direction X. Specifically, the LED module 21 includes at least three LED chips 2101 for emitting red light, emitting green light, and emitting blue light, disposed in the chip carrier 22 and arranged sequentially along the first direction. The top of the chip carrier 22 has a mounting groove 2201, and each LED chip 2101 is arranged in the mounting groove 2201 along the first direction X. The chip carrier 22 can be accommodated at the bottom of the receiving groove 303, and the bottom of the chip carrier 22 is opaque, allowing the light from each LED chip 2101 to be fully directed towards the lens body 103, thus improving the light output effect.

[0097] Referring to Figures 30 and 31, in some embodiments, the cross-sectional width of the lens body 103 gradually decreases from the bottom plane 102 toward the convex surface 101. Specifically, the convex surface 101 is shaped, but not limited to, a hemispherical, dome, semi-elliptical, or dome-shaped truncated body with the dome cut off at the top. The receiving groove 303 and the reflecting groove 403 are both formed inside the lens body 103, eliminating the need for structural processing of the convex surface 101 of the lens body 103. In some embodiments, the material of the lens body 103 includes one or more of PMMA (polymethyl methacrylate), PC (polycarbonate), and PS (polystyrene). The lens body 103 is integrally molded in a mold using injection molding, making molding faster and manufacturing simpler. For example, referring to Figure 29, the bottom plane 102 of the lens body 103 has multiple outwardly protruding connecting ears 503. Specifically, in the injection molding process of the lens body 103, multiple lens bodies 103 are simultaneously processed and manufactured in the mold. The lens bodies 103 are connected to each other through connecting ears 503. After injection molding, the connecting ears 503 that are connected to each other can be cut directly to separate the lens bodies 103 without damaging the convex surface 101 of the lens body 103. This is beneficial for mass processing of lens bodies 103 and improves production efficiency.

[0098] Some embodiments of this application also provide a light source device (not shown), including at least one light source component 203 and at least one lens 3100 corresponding to the light source component 203, wherein the lens 3100 is the lens 3100 described above; each light source component 203 is disposed in the receiving groove 303 of the corresponding lens 3100. The light source component 203 is an RGB-based LED light source; the light source device also includes a circuit board for electrically connecting to the light source component 203, the circuit board being capable of controlling each LED chip of the light source component 203 respectively.

[0099] The above are merely some embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display device, comprising: Display panel, used to display images; A backlight module is disposed on the light-incident side of the display panel and is used to provide backlight for the display panel; The backlight module includes: Multiple light sources; Multiple optical lenses are provided, with the optical lenses positioned closer to the light source than the light source on the light-incident side of the display panel. The concave surface of each optical lens facing the light source forms the light-incident surface, and the convex surface of each optical lens facing away from the light source forms the light-outceasing surface. Light emitted from the light source enters the optical lens through the light-incident surface and exits from the light-outceasing surface after being refracted by the optical lens. The area of ​​the cross-section of the light-incident surface gradually decreases along the axial direction of the optical lens from the opening corresponding to the light-incident surface. Wherein, the cross-section of the light-incident surface and / or the cross-section of the light-exit surface are non-circular, so that the emitted light spot of the optical lens presents a non-circular symmetrical distribution.

2. The display device according to claim 1, wherein, The cross-section of the incident light surface is formed by connecting multiple curves, and the distance between different points on the curves and the center point of the cross-section varies along the curve direction.

3. The display device according to claim 2, wherein, The distance between different points on the curve and the center point of the cross-section varies monotonically along the curve.

4. The display device according to claim 3, wherein, The two connected curves on the cross-section of the light-incident surface are arranged axially symmetrically, and the angle between the two ends of the curve and the center of axial symmetry of the cross-section where the curve is located is 45 degrees.

5. The display device according to claim 2, wherein, The distance between the first target point on the curve and the outer edge of the bottom surface where the opening is located is greater than or equal to a first predetermined length. The first target point is the point on the curve that is farthest from the center point of the cross-section. The first predetermined length is 0.15 mm.

6. The display device according to claim 2, wherein, The distance between the second target point on the curve and the edge of the light source is greater than or equal to a second predetermined length. The second target point is the point on the curve closest to the center point of the cross-section. The second predetermined length is 0.15 mm.

7. The display device according to claim 2, wherein, The light-emitting surface has a square cross-section, and each adjacent side of the cross-section of the light-emitting surface is provided with a rounded corner, the radius of which is less than or equal to one-quarter of the side length of the square.

8. The display device according to claim 7, wherein, The light-emitting surface is a cross-shaped curved surface, which is composed of a concave surface with a smooth transition in the horizontal and vertical directions and a convex surface with a smooth transition between the concave surfaces in the horizontal and vertical directions; the rounded corners are provided on the convex surface.

9. The display device according to claim 8, wherein, The second target point on the curve is located on the diagonal of the cross section of the curve. The second target point is the point on the curve that is closest to the center point of the cross section. The second target point and the diagonal are in the same plane.

10. The display device according to claim 1, wherein, The light-emitting surface has a square cross-section, and each adjacent side of the cross-section of the light-emitting surface is provided with a rounded corner, the radius of which is less than or equal to one-quarter of the side length of the square.

11. The display device according to claim 10, wherein, The light-emitting surface is a cross-shaped curved surface, which is composed of a concave surface with a smooth transition in the horizontal and vertical directions and a convex surface with a smooth transition between the concave surfaces in the horizontal and vertical directions; the rounded corners are provided on the convex surface.

12. A light mixing device, comprising: support; A light source, which is disposed on the bracket; A light mixing element is disposed on the bracket. The light mixing element is frustum-shaped, and the peripheral wall of the light mixing element is a reflective wall. One axial end of the light mixing element is an injection end, and the other axial end is an emission end. The outer diameter of the injection end is larger than the outer diameter of the emission end. The injection end is configured to allow light from the light source to enter the light mixing element.

13. The light mixing device according to claim 12, wherein, The emitting end is configured to allow the light rays within the light mixing element to exit the light mixing element.

14. The light mixing device according to claim 12, wherein, Along the axial direction of the light mixing element, the light source is disposed on the side of the light mixing element near the injection end.

15. The light mixing device according to any one of claims 12 to 14, wherein, The end face of the emission end is frosted; the light mixing element is a hollow light mixing shell, which surrounds a light mixing cavity, which is truncated cone-shaped; the end face of the injection end is provided with an injection port, which communicates with the light mixing cavity, and the injection port allows the light from the light source to enter the light mixing cavity.

16. The light mixing device according to any one of claims 12 to 14, wherein, The light mixing component is a transparent component, and a reflective layer is provided on the peripheral wall of the light mixing component. The reflective layer is used to reflect the light inside the light mixing component. The light mixing component is a polymethyl methacrylate component or a polycarbonate component. The reflective layer is an aluminum layer.

17. The light mixing device according to any one of claims 12 to 14, further comprising: A convex lens, which is disposed on the outside of the light mixing element.

18. A lens for a light source assembly, comprising a lens body, the lens body being a plano-convex lens, the lens body having a convex surface and a bottom plane; The lens body has a receiving groove and a reflecting groove recessed towards the interior of the lens body on the bottom plane; The receiving groove is located in the middle of the bottom plane and is used to receive the light source assembly. The reflecting groove is located on at least one of the opposite sides of the receiving groove. The inner wall of the reflecting groove forms a reflecting surface, which is used to reflect the light emitted by the light source assembly toward the reflecting groove.

19. The lens according to claim 18, wherein, The reflective surface is inclined, with the end of the reflective surface closer to the bottom surface being closer to the receiving groove than the end farther from the bottom surface; a first angle is formed between the reflective surface and the bottom surface; the angle range of the first angle is 45°-60°; the depth of the reflective groove recessed from the bottom surface toward the interior of the lens body is L1, and the maximum thickness of the lens body is T1; wherein, L1 < 1 / 3T1; the cross-sectional shape of the reflective groove is triangular, and the cross-sectional width of the reflective groove gradually decreases from the bottom surface toward the interior of the lens body; the cross-sectional shape of the reflective groove is a right triangle, and the reflective surface forms the hypotenuse of the right triangle; The light source assembly includes: The LED module includes at least three LED chips arranged along a first direction; the accommodating groove has reflective grooves on both sides of opposite sides in the first direction. A chip carrier, wherein a mounting groove is provided at one end of the chip carrier facing the receiving groove, and each LED chip is disposed in the mounting groove along the first direction; In particular, the cross-sectional width of the lens body gradually decreases from the bottom surface toward the light-emitting surface.

20. A light source device, comprising at least one light source assembly and at least one lens disposed corresponding to the light source assembly, wherein the lens is the lens as described in claim 18 or 19, and each of the light source assemblies is disposed in the receiving groove of the corresponding lens.

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