LED display module and LED display device with same

Abstract

The invention provides an LED display module and an LED display device with the LED display module, and the LED display module comprises a lamp panel; the lens assembly is arranged on the front side of the lamp panel, the lens assembly and the lamp panel are arranged in a spaced mode, the lens assembly comprises a plurality of lens structures arranged in the first preset direction, each lens structure is provided with a forwards-protruding curved surface and a backwards-protruding curved surface, and the curvature of the backwards-protruding curved surface is larger than that of the forwards-protruding curved surface. According to the technical scheme, the problem that the viewing angle of an LED display module in the related technology is small can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of LED display, and in particular, to an LED display module and an LED display device having the same. Background Art

[0002] Multi-view display is an innovative display technology that can provide separate display content for users in different positions. Different from traditional display technologies, multi-view display technology projects different images onto specific areas by precisely controlling the direction of light, so that different viewers can see different display screens. If the application of multi-view display technology in LED display devices represents an important progress in display technology, it can provide viewers with a richer and more personalized visual experience.

[0003] Currently, the main methods that can cooperate with LED display devices to achieve multi-view display effects are the slit masking scheme and the plano-convex cylindrical lens grating scheme.

[0004] The slit masking scheme is to design the opening size and off-screen distance of the slit, and then in a masking manner, let the light emitted by the corresponding sub-pixels in each viewing area propagate to the corresponding position, while blocking the light emitted by the sub-pixels in adjacent viewing areas to achieve the multi-view display effect. However, this will result in too low brightness in the entire viewing area, and the display effect is not very good. This method cannot well change the propagation direction of light, but achieves the multi-view display effect by masking the stray light in other viewing areas.

[0005] The plano-convex cylindrical lens grating scheme can be regarded as an improved scheme of the slit masking scheme. The plano-convex cylindrical lens also has the ability to accurately split light in terms of light control ability. The light control feature of the plano-convex cylindrical lens grating is to focus light only in one direction, and does not change the original propagation direction and path of light in the direction orthogonal to this direction. However, the plano-convex cylindrical lens grating has a small deflection angle for light. Generally, when the viewing angle distribution is within 60°, the plano-convex cylindrical lens grating can easily control the light beam emitted by the pixels. If it is greater than 60°, it is not easy for the plano-convex cylindrical lens grating to control and constrain the light beam emitted by the pixels at the corresponding position. In addition, the larger the viewing angle, the fewer the corresponding deflected light beams, resulting in uneven brightness distribution in the overall viewing area and also exacerbating the influence of crosstalk. At the same time, due to the gradual increase of the incident angle, part of the light will undergo total internal reflection and cannot be deflected to the position where the corresponding viewing area is located, ultimately resulting in much lower brightness in the viewing area with a large angle compared to the brightness of other viewing areas, greatly affecting the viewing experience of users. Summary of the Invention

[0006] The main object of the present invention is to provide an LED display module and an LED display device having the same, so as to solve the problem of a small viewing angle of the LED display module in the related art.

[0007] To achieve the above object, according to one aspect of the present invention, there is provided an LED display module, including: a lamp board; a lens assembly disposed on the front side of the lamp board and spaced apart from the lamp board, the lens assembly including a plurality of lens structures disposed along a first preset direction, the lens structure having a front protruding surface and a rear protruding surface, and the curvature of the rear protruding surface being greater than the curvature of the front protruding surface.

[0008] Further, the plurality of lens structures include a first lens and a second lens disposed adjacent to each other, and the curvature of the rear protruding surface of the first lens is greater than the curvature of the rear protruding surface of the second lens.

[0009] Further, the LED display module further includes a first support baffle supported between the lamp board and the lens assembly, the first support baffle being located between the first lens and the second lens, the lamp board having a plurality of lamp bead rows arranged along the first preset direction, the lamp board being capable of generating a first light field through the second lens, and part of the lamp bead rows being located on a first side of the first lens in the first preset direction, so that the lamp board can generate a second light field through the first lens, and the second light field is located on a first side of the first light field in the first preset direction.

[0010] Further, part of the lamp bead rows are located on a second side of the first lens in the first preset direction, so that the lamp board can generate a third light field through the first lens, and the third light field is located on a second side of the second light field in the first preset direction.

[0011] Further, the lens structure is a columnar structure extending along a second preset direction, the lamp bead row includes a plurality of lamp beads along the second preset direction, the first lens and the second lens are both multiple and arranged alternately, and a light shielding portion is provided between adjacent first lenses and second lenses, and the light shielding portion is used to shield the lamp bead rows generating the second light field or the third light field, wherein the first preset direction and the second preset direction are arranged at an angle.

[0012] Further, an anti-reflection coating is provided on the front protruding surface of the first lens.

[0013] Further, the LED display module further includes a second support baffle supported between the lamp board and the lens assembly, the second support baffle extending along the first preset direction, and a plurality of second support baffles spaced apart along the second preset direction are provided between every two adjacent first support baffles.

[0014] Further, two adjacent second support baffles in the first preset direction are arranged in a staggered manner in the second preset direction.

[0015] Further, the lamp board includes a plurality of light-emitting chips arranged in an array. Among three sequentially arranged light-emitting chips, each light-emitting chip is one of a blue light-emitting chip, a red light-emitting chip, and a green light-emitting chip, and the three light-emitting chips are all different. The three sequentially arranged light-emitting chips form a lamp bead.

[0016] Further, the curvature of the rear convex surface of the first lens is greater than or equal to 0.48 and less than or equal to 0.58, and the ratio of the curvature of the rear convex surface of the first lens to the curvature of the front convex surface of the first lens is greater than or equal to 2:1 and less than or equal to 2.5:1; and / or, the curvature of the rear convex surface of the second lens is greater than or equal to 0.35 and less than or equal to 0.45, and the ratio of the curvature of the rear convex surface of the second lens to the curvature of the front convex surface of the second lens is greater than or equal to 0.5:1 and less than or equal to 1:1.

[0017] According to another aspect of the present invention, there is provided an LED display device, including an LED display module, and the LED display module is the above-mentioned LED display module.

[0018] Applying the technical solution of the present invention, the lamp board is used for emitting light, and the lens assembly is used for modulating light to form a plurality of light fields. The lens assembly is arranged on the front side of the lamp board and is spaced from the lamp board. The lamp board and the lens assembly cooperate to achieve the effect of multi-view display. Specifically, the lens assembly includes a plurality of lens structures arranged along a first preset direction. The lens structure has a front convex surface and a rear convex surface, and the curvature of the rear convex surface is greater than the curvature of the front convex surface. With such a setting, the lens structure forms an asymmetric hyperbolic lens. The asymmetric curvature design of the hyperbolic lens realizes the expansion of the display range by regulating the optical path in stages. When the light first contacts the rear convex surface, the larger curvature forms a relatively steep refraction interface, causing the light beam to diverge significantly at the initial stage of propagation. Compared with the symmetric lens in the related art, the lens of the present application can diverge the light beam, laying a foundation for wide-angle propagation. However, simply diverging the light beam will cause the disorder of the light energy distribution. Therefore, the front convex surface has a smaller curvature, and the relatively gentle refraction gradient performs secondary modulation on the diffused light, constraining the stray light that deviates excessively from the axis, forming a "divergence-convergence" cascaded light beam modulation. Through the above modulation of the light beam, on the one hand, the range of the light field formed by the light beam is expanded, and the energy of the light beam can be controlled within the designed light field, ensuring the display effect. By expanding the range of the light field, the viewing angle of the LED display module is increased, so that the viewing angle of the LED display module is relatively large. Therefore, the technical solution of the present application can effectively solve the problem that the viewing angle of the LED display module in the related art is relatively small. Description of the Drawings

[0019] The accompanying drawings of the specification, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 Shows a three-dimensional structural schematic diagram of an embodiment of an LED display module according to the present invention;

[0021] Figure 2 Shows Figure 1 A three-dimensional structural schematic diagram of a partial structure of the LED display module;

[0022] Figure 3 Shows Figure 1 A side view schematic diagram of the LED display module;

[0023] Figure 4 Shows Figure 1 A light field simulation diagram of the LED display module;

[0024] Figure 5 Shows a side view schematic diagram of a first comparative example of an LED display device in the related art;

[0025] Figure 6 Shows Figure 5 A light field simulation diagram of the LED display device;

[0026] Figure 7 Shows a side view schematic diagram of a second comparative example of an LED display device in the related art;

[0027] Figure 8 Shows Figure 7 A light field simulation diagram of the LED display device;

[0028] Figure 9 Shows a side view schematic diagram of a third comparative example of an LED display device in the related art;

[0029] Figure 10 Shows Figure 9 A light field simulation diagram of the LED display device;

[0030] Figure 11 Shows Figure 1 A light field simulation diagram of the LED display module, wherein the LED display module is 10 meters away from the receiving screen;

[0031] Figure 12 Shows Figure 1 A light field simulation diagram of the LED display module, wherein the LED display module is 30 meters away from the receiving screen;

[0032] Figure 13 Shows Figure 1Optical field simulation diagram of the LED display module, where the LED display module is 50 meters away from the receiving screen.

[0033] Among them, the above-mentioned drawings include the following reference numerals:

[0034] a. First preset direction; b. Second preset direction;

[0035] 10. Lamp board; 11. Lamp bead row; 12. First lamp bead row; 13. Non-emitting lamp bead row; 14. Second lamp bead row; 15. Third lamp bead row;

[0036] 20. Lens assembly; 21. Lens structure; 211. First lens; 212. Second lens; 22. Light-shielding part;

[0037] 30. First support baffle;

[0038] 40. Second support baffle; 41. Positioning hole. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0040] As Figures 1 to 3 shown, the present application provides an LED display module. The embodiments of the LED display module of the present application include: a lamp board 10 and a lens assembly 20; the lens assembly 20 is arranged on the front side of the lamp board 10 and is spaced apart from the lamp board 10. The lens assembly 20 includes a plurality of lens structures 21 arranged along the first preset direction a. The lens structure 21 has a front protruding surface and a rear protruding surface, and the curvature of the rear protruding surface is greater than the curvature of the front protruding surface.

[0041] Applying the technical solution of this embodiment, the light board 10 is used for emitting light, and the lens assembly 20 is used for modulating light to form multiple light fields. The lens assembly 20 is arranged on the front side of the light board 10 and is spaced from the light board 10. The light board 10 and the lens assembly 20 cooperate to achieve the effect of multi-view display. Specifically, the lens assembly 20 includes a plurality of lens structures 21 arranged along the first preset direction a. The lens structure 21 has a front protruding surface and a rear protruding surface, and the curvature of the rear protruding surface is greater than that of the front protruding surface. With such a setting, the lens structure 21 forms an asymmetric hyperbolic lens. The asymmetric curvature design of the hyperbolic lens realizes the expansion of the display range by regulating the light path in stages. When the light first contacts the rear protruding surface, the larger curvature forms a relatively steep refraction interface, causing the light beam to diverge significantly in the initial stage of propagation. Compared with the symmetric lens in the related art, the lens in this embodiment can diverge the light beam, laying the foundation for wide-angle propagation of the diverging light beam. However, simply diverging the light beam will lead to disordered light energy distribution. Therefore, the front protruding surface has a smaller curvature, and the relatively gentle refraction gradient performs secondary modulation on the already diffused light, constraining the stray light that deviates excessively from the axis, forming a "divergence-convergence" cascaded light beam modulation. Through the above modulation of the light beam, on the one hand, the range of the light field formed by the light beam is expanded, and the energy of the light beam can be controlled within the designed light field, ensuring the display effect. By expanding the range of the light field, the viewing angle of the LED display module is increased, making the viewing angle of the LED display module larger. Therefore, the technical solution of this embodiment can effectively solve the problem of the small viewing angle of the LED display module in the related art.

[0042] As Figures 1 to 3 shown, the plurality of lens structures 21 include a first lens 211 and a second lens 212 arranged adjacent to each other. The curvature of the rear protruding surface of the first lens 211 is greater than that of the rear protruding surface of the second lens 212. Specifically, by making the curvatures of the rear protruding surfaces of two adjacent lens structures 21 (i.e., the first lens 211 and the second lens 212) inconsistent, the overall deflection angle of the light beam passing through the second lens 212 is smaller, and the position of the formed light field is more biased towards the middle. The overall deflection angle of the light beam passing through the first lens 211 is larger, and the position of the formed light field is more biased towards the outside, thereby increasing the distribution range of the light field and further increasing the viewing angle of the LED display module, making the viewing angle of the LED display module larger.

[0043] As Figures 1 to 4As shown, the LED display module further includes a first support baffle 30 supported between the lamp board 10 and the lens assembly 20. The first support baffle 30 is located between the first lens 211 and the second lens 212. The lamp board 10 has a plurality of lamp bead rows 11 arranged along the first preset direction a. The lamp board 10 can generate a first light field through the second lens 212. Some of the lamp bead rows 11 are located on the first side of the first lens 211 in the first preset direction a, so that the lamp board 10 can generate a second light field through the first lens 211. The second light field is located on the first side of the first light field in the first preset direction a. It should be noted that "some of the lamp bead rows 11 are located on the first side of the first lens 211 in the first preset direction a" means that some of the lamp bead rows 11 are located on the first side of the projection of the first lens 211 on the lamp board 10 in the first preset direction a. The light beams emitted by these lamp bead rows 11 located on the first side of the first lens 211 in the first preset direction a can contact a steeper contact surface of the rear convex surface of the first lens 211 (compared with the contact surface in the middle of the rear convex surface of the first lens 211), so that the deflection angle of these light beams can be larger, further increasing the viewing angle of the LED display module and making the viewing angle of the LED display module larger.

[0044] As Figures 1 to 4 shown, some of the lamp bead rows 11 are located on the second side of the first lens 211 in the first preset direction a, so that the lamp board 10 can generate a third light field through the first lens 211. The third light field is located on the second side of the second light field in the first preset direction a. Similarly, "some of the lamp bead rows 11 are located on the second side of the first lens 211 in the first preset direction a" means that some of the lamp bead rows 11 are located on the second side of the projection of the first lens 211 on the lamp board 10 in the first preset direction a. The light beams emitted by these lamp bead rows 11 located on the second side of the first lens 211 in the first preset direction a can contact a steeper contact surface of the rear convex surface of the first lens 211, so that the deflection angle of these light beams can be larger. Through the arrangement of the first light field, the second light field and the third light field, the range of the light field formed by the entire LED display module is larger.

[0045] As Figures 1 to 4As shown, the lens structure 21 is a columnar structure extending along the second preset direction b. The lamp bead row 11 includes a plurality of lamp beads along the second preset direction b. Both the first lens 211 and the second lens 212 are multiple and are arranged alternately. A light-shielding portion 22 is provided between adjacent first lenses 211 and second lenses 212. The light-shielding portion 22 is used to block the lamp bead row 11 that generates the second light field or the third light field. Among them, the first preset direction a and the second preset direction b are arranged at an angle. Specifically, due to the small curvature at the connection between the first lens 211 and the second lens 212, and even in this embodiment, the connection between the first lens 211 and the second lens 212 is a planar structure, the light-shielding portion 22 prevents the light beams generated by this part of the lamp bead row 11 on both sides of the first lens 211 from diverging through the connection between the first lens 211 and the second lens 212. If this part of the light beam is not blocked by the light-shielding portion 22, the diverging light beam will interfere with other light fields.

[0046] Specifically, in this embodiment, taking Figure 1 and Figure 2 as an example, hanging the Figure 1 and Figure 2 in the LED display module can form the Figure 4 effect of light field simulation. Figure 4 Above the Figure 4 is the upper part of the formed light field, and Figure 1 and Figure 2 below the Figure 1 and Figure 2 is the lower part of the formed light field. Correspondingly, Figure 3 and Figure 3As shown in the figure, for the first lens 211, within the area corresponding to the second lens 212, there are 2 third bead rows 15, 4 non - emitting bead rows 13, and 2 second bead rows 14 arranged from top to bottom. Each third bead row 15 forms a third sub - light field, and all the third sub - light fields are located below the first light field. The 2 third sub - light fields together form the third light field. Each second bead row 14 forms a second sub - light field, and all the second sub - light fields are located above the first light field. The 2 second sub - light fields together form the second light field. In total, 9 sub - light fields are formed. The non - emitting bead rows 13 are arranged at the position of the contact surface corresponding to the middle part of the first lens 211. The non - emitting bead rows 13 do not emit light because if they emit light, the light beams emitted by them will diverge to the first light field due to the relatively flat contact surface in the middle part of the first lens 211, thus interfering with the first light field. In other embodiments, here, it is also possible not to arrange bead rows instead of the non - emitting bead rows 13. It should be noted that when the first side of the first lens 211 refers to the upper side, the second light field being located on the first side of the first light field in the first preset direction a means the lower side in the first preset direction a. The same applies to the third light field.

[0047] In an LED display module, the number of pixels (i.e., the number of beads) in the horizontal and vertical rows is 312×156, that is, the resolution is 312×156. In this embodiment, some beads need to be removed for installing the first support baffle 30 and the second support baffle 40 mentioned later. If it is necessary to achieve the distribution of nine viewing areas (i.e., 9 light fields) in space, then after the beam modulation by the lens assembly 20, the resolution of each viewing area will become 21×12. The ratio of the horizontal and vertical resolutions is 1.8:1, that is, the resolution of each viewing area can be made close to the display effect of 2.5K. Therefore, by adjusting the number and arrangement rules of the first support baffle 30 and the second support baffle 40, the purpose of balancing the display image resolution of each viewing area can be achieved.

[0048] In addition, in this embodiment, the front - protruding curved surface of the first lens 211 is provided with an anti - reflection coating. Specifically, due to the relatively large curvature of the rear - protruding curved surface of the first lens 211, the incident angle of some light beams is too large, resulting in total internal reflection on the front - protruding curved surface inside the first lens 211. The light beams after total internal reflection are reflected on the rear - protruding curved surface of the first lens 211, and finally the reflected light beams exit from the front - protruding curved surface of the first lens 211. The design angles of these exiting light rays are different from those of the light beams originally refracted by the first lens 211, thus bringing crosstalk to other light fields.

[0049] As Figures 1 to 3As shown, the LED display module further includes a second support baffle 40 disposed between the lamp board 10 and the lens assembly 20. The second support baffle 40 extends along a first preset direction a, and a plurality of second support baffles 40 are disposed at intervals along a second preset direction b between every two adjacent first support baffles 30. Specifically, the plurality of second support baffles 40 can enhance the support strength of the lamp board 10 and the lens assembly 20. In addition, a positioning hole 41 is provided on the second support baffle 40 for positioning and installing the lens assembly 20.

[0050] When using a plano-convex cylindrical lens grating array to achieve three-dimensional light field display, periodic moiré fringes and rainbow fringes often appear in the displayed image. Moiré fringes are caused by the interference between two or more periodic structures. When these periodic structures are close but not exactly the same, corresponding interference patterns will be generated, and this interference pattern is the so-called moiré fringe; while rainbow fringes are caused by the dispersion of light. In light field display, when the light beam emitted by a pixel passes through an optical element, due to different wavelengths, the incident light beam will have different degrees of deflection, resulting in color deviation, and presenting a periodic rainbow stripe phenomenon visually. In the art, usually, the plano-convex cylindrical lens grating array is tilted at a certain angle along the vertical direction to destroy the periodic structure of the pixel arrangement, thereby breaking the interference adjustment between the periodic structures to reduce the generation of moiré fringes and rainbow fringes. This tilt angle is related to the intercept of the lens and the pitch of the pixels. However, this method will, to some extent, exacerbate the crosstalk phenomenon, bringing a significant impact on the user's viewing experience. In this embodiment, if the lens assembly 20 uses the above-mentioned tilting method to eliminate the inherent moiré fringes and rainbow fringes in light field display, it may lead to an increase in crosstalk between light fields due to the inconsistency between adjacent first lenses 211 and second lenses 212, and at the same time, it cannot completely eliminate the influence of moiré fringes and rainbow fringes.

[0051] As Figures 1 to 3 shown, two adjacent second support baffles 40 in the first preset direction a are staggeredly arranged in the second preset direction b. Specifically, the first support baffles 30 are periodically distributed, and by staggeredly arranging the plurality of second support baffles 40 to change the periodic structure of the original lamp bead arrangement, thereby reducing the similarity between its periodic structure and the periodic structure of the lens assembly 20, so as to achieve the purpose of reducing moiré fringes.

[0052] In addition, in this embodiment, the lamp board 10 includes a plurality of light-emitting chips arranged in an array. Among three light-emitting chips arranged in sequence (either in the first preset direction a or the second preset direction), each light-emitting chip is one of a blue light-emitting chip, a red light-emitting chip, and a green light-emitting chip, and the three light-emitting chips are all different. The three light-emitting chips arranged in sequence form a lamp bead. By setting like this, the purpose of effectively reducing rainbow fringes can be achieved.

[0053] In addition, in this embodiment, the curvature of the rear convex surface of the first lens 211 is greater than or equal to 0.48 and less than or equal to 0.58, and the ratio of the curvature of the rear convex surface of the first lens 211 to the curvature of the front convex surface of the first lens 211 is greater than or equal to 2:1 and less than or equal to 2.5:1; and / or, the curvature of the rear convex surface of the second lens 212 is greater than or equal to 0.35 and less than or equal to 0.45, and the ratio of the curvature of the rear convex surface of the second lens 212 to the curvature of the front convex surface of the second lens 212 is greater than or equal to 0.5:1 and less than or equal to 1:1. Specifically, the curvature of the rear convex surface of the first lens 211 can be 0.48, 0.49, 0.55 or 0.58, and the ratio of the curvature of the rear convex surface of the first lens 211 to the curvature of the front convex surface of the first lens 211 can be 2:1, 2.2:1, 2.3:1 or 2.5:1; the curvature of the rear convex surface of the second lens 212 can be 0.35, 0.38, 0.4, 0.42 or 0.45, and the ratio of the curvature of the rear convex surface of the second lens 212 to the curvature of the front convex surface of the second lens 212 can be 0.5:1, 0.65:1, 0.8:1 or 1:1.

[0054] The following will use simulation data and the formed schematic diagrams to illustrate the differences in the light field range and brightness in the comparison between the LED display module of this embodiment and other LED display modules in the art, and the crosstalk situation at different distances between the LED display module of this embodiment and the receiving screen.

[0055] Taking nine viewing areas as an example, as Figures 4 to 10 shown, among them, the first comparative example is an LED display module without a lens; the second comparative example is an LED display module with a traditional plano-convex cylindrical lens; the third comparative example is an LED display module with a plano-convex cylindrical lens having a front convex surface with different curvatures.

[0056] The following table shows the crosstalk rate and brightness ratio of the comparative examples and the embodiments after simulation, where the brightness ratio is referenced to the brightness value of the first comparative example, and other brightness ratio data in the table represent the percentage increase in the brightness value relative to the value of the first comparative example.

[0057]

[0058]

[0059] As Figures 11 to 13As shown in the figure, the distribution of the coherent illuminance of the LED display module of this embodiment after a distance of 10m, 30m, and 50m from the receiving screen. It can be seen from the gray-scale distribution in the figure that there is no obvious moiré fringe phenomenon. The coherent illuminance of each viewing area is clearly demarcated without obvious overlapping phenomenon, and no new interference fringes are generated, indicating that the LED display module of this embodiment can effectively suppress the generation of moiré fringes.

[0060] Therefore, the LED display module applying this embodiment has the following advantages:

[0061] 1. Large viewing angle: The viewing angle has been increased by about 167% compared with the LED display module in the related technology. The effective viewing angle of the LED display module in the related technology can only reach within 60°.

[0062] 2. Low crosstalk: Due to its structure, the LED display module in the related technology will have relatively large crosstalk in the viewing areas formed at large angles. The range of the viewing area formed by the pixels at the position farther away from the center of the LED display module is larger than that formed at the position closer to the center of the LED display module, and sometimes it will overlap with a part of the adjacent viewing area, causing crosstalk phenomenon, which has a great impact on the viewing experience. The LED display module of this embodiment can greatly reduce the crosstalk phenomenon between viewing areas.

[0063] 3. High brightness: The light control characteristic of the plano-convex cylindrical lens is that the brightness of the viewing area formed by the pixels near the center of the lens is generally much higher than that of the viewing area formed by the pixels far from the center of the lens. The farther the distance, the lower the brightness. The LED display module of this embodiment can effectively improve this phenomenon and can make the brightness of each viewing area as balanced as possible. If the viewing area angle constructed is too large (exceeding 160°), the brightness of the corresponding viewing area will drop a lot. The LED display module of this embodiment can ensure that the brightness of the viewing area constructed within the range of 130° can be as consistent as possible without adjusting the brightness of each pixel.

[0064] 4. Balanced resolution: The display effect of balanced resolution can be achieved without tilting the cylindrical lens.

[0065] 5. Reducing the influence of moiré fringes: Without rotating the lens grating array, the width of the moiré fringes can be weakened without aggravating the influence of crosstalk.

[0066] The following is the manufacturing process of the lens assembly 20 of the LED display module of this embodiment:

[0067] According to the distribution characteristics of the viewing areas, two types of alternately arranged first lenses 211 and second lenses 212 are designed respectively. The parameters here include the curvature magnitudes before and after the lenses, thickness, intercept, the off-screen distance of the lenses, and the materials used for the lenses, as well as the refractive index of the glue used for bonding the lenses (if it is integrally injection-molded, this does not need to be considered).

[0068] If the materials used for the designed lenses are the same, but due to processing technology problems, they cannot be integrally injection-molded, then the two types of plano-convex cylindrical lens arrays on the front and back surfaces of the lenses can be processed using the injection molding process first, and then these two types of plano-convex cylindrical lenses are bonded front and back on a transparent material to form a lens structure 21. The refractive indices of the materials used for the front and back lenses can be the same as or close to the refractive index of the transparent material and the glue used. If there is no difficulty in the processing technology, the two types of lenses can be directly integrally injection-molded. If different materials are used for each designed lens, then each type of lens needs to be processed separately, and lens positioning marks are set at corresponding positions on the transparent medium to bond these lenses. The specific situation needs to be determined according to the distribution of the viewing areas. When processing the lens assembly 20, positioning holes need to be left at the positions without curvature (the planar positions between adjacent lens structures 21). If this area is too small and not conducive to drilling, they can also be not left. After the lenses are integrally formed, light-shielding strips also need to be pasted at the corresponding positions on the front surface without curvature between the lens structures 21 to form a light-shielding portion 22.

[0069] This application also provides an LED display device. The LED display device of this application includes an LED display module, wherein the LED display module is the above-mentioned LED display module. The above-mentioned LED display module can effectively solve the problem of the relatively small viewing angle of the LED display module in the related art, and the LED display device with the above-mentioned LED display module also has the above-mentioned advantages.

[0070] In the description of the present invention, it should be understood that "a plurality of" means a quantity of two or more than two. The orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0071] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is merely for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An LED display module, characterized in that: include: Light board (10); A lens assembly (20) is arranged on the front side of the light board (10) and is spaced apart from the light board (10), wherein the lens assembly (20) comprises a plurality of lens structures (21) arranged along a first preset direction (a), wherein the lens structure (21) has a front protruding curved surface and a rear protruding curved surface, wherein the curvature of the rear protruding curved surface is greater than the curvature of the front protruding curved surface.

2. The LED display module according to claim 1, characterized in that: The plurality of lens structures (21) include a first lens (211) and a second lens (212) that are adjacently arranged, and the curvature of the rearwardly projecting curved surface of the first lens (211) is greater than the curvature of the rearwardly projecting curved surface of the second lens (212).

3. The LED display module according to claim 2, characterized in that: The LED display module further comprises a first support baffle (30) supported and arranged between the lamp board (10) and the lens assembly (20), the first support baffle (30) being located between the first lens (211) and the second lens (212), the lamp board (10) having a plurality of lamp bead rows (11) arranged along the first preset direction (a), the lamp board (10) being capable of generating a first light field through the second lens (212), a portion of the lamp bead rows (11) being located on a first side of the first lens (211) in the first preset direction (a), so that the lamp board (10) is capable of generating a second light field through the first lens (211), the second light field being located on a first side of the first light field in the first preset direction (a).

4. The LED display module according to claim 3, characterized in that: Part of the lamp bead row (11) is located on the second side of the first lens (211) in the first preset direction (a), so that the light board (10) can generate a third light field through the first lens (211), and the third light field is located on the second side of the second light field in the first preset direction (a).

5. The LED display module according to claim 4, characterized in that: The lens structure (21) is a columnar structure extending along a second preset direction (b); the lamp bead row (11) comprises a plurality of lamp beads along the second preset direction (b); the first lens (211) and the second lens (212) are both multiple and alternately arranged; a shading portion (22) is arranged between adjacent first lenses (211) and second lenses (212); the shading portion (22) is used to shield the lamp bead row (11) that generates the second light field or the third light field; wherein the first preset direction (a) and the second preset direction (b) are arranged at an angle.

6. The LED display module according to claim 2, characterized in that: The front curved surface of the first lens (211) is provided with an anti-reflective coating.

7. The LED display module according to claim 5, characterized in that: The LED display module further comprises a second support baffle (40) supported and arranged between the lamp board (10) and the lens assembly (20), wherein the second support baffle (40) extends along a first preset direction (a), and a plurality of second support baffles (40) are arranged between each two adjacent first support baffles (30) and are spaced apart along the second preset direction (b).

8. The LED display module according to claim 7, characterized in that: Two second supporting baffles (40) adjacent to each other in the first preset direction (a) are staggered in the second preset direction (b).

9. The LED display module according to claim 5, characterized in that: The light panel (10) comprises a plurality of light-emitting chips arranged in an array, wherein each of the three light-emitting chips arranged in sequence is one of a blue light-emitting chip, a red light-emitting chip and a green light-emitting chip, and the three light-emitting chips are all different, and the three light-emitting chips arranged in sequence form a lamp bead.

10. The LED display module according to any one of claims 2 to 8, characterized in that: The curvature of the rearward curved surface of the first lens (211) is greater than or equal to 0.48 and less than or equal to 0.58, and the ratio of the curvature of the rearward curved surface of the first lens (211) to the curvature of the forward curved surface of the first lens (211) is greater than or equal to 2:1 and less than or equal to 2.5:1; and / or, The curvature of the rearward curved surface of the second lens (212) is greater than or equal to 0.35 and less than or equal to 0.45, and the ratio of the curvature of the rearward curved surface of the second lens (212) to the curvature of the forward curved surface of the second lens (212) is greater than or equal to 0.5:1 and less than or equal to 1:

1.

11. An LED display device, comprising an LED display module, characterized in that: The LED display module is the LED display module according to any one of claims 1 to 10.

Images