Light guide structure, light-emitting module and LED display screen
By designing the light guide column as a polygonal column structure, especially with the first section being a rounded polygon and the second section being a beveled design, the stress concentration problem at the light-inlet end of the light guide column was solved, improving the stability of production and transportation, and enhancing light utilization and image quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-03
AI Technical Summary
The sharp edges of the light guide columns in existing LED displays are prone to stress concentration, which can lead to damage and is detrimental to production and transportation.
The light guide column is designed as a polygonal column structure. The cross-section of the first section is a polygon with rounded corners. The second section has an inclined surface between the two sides that slopes away from the center line. The light guide column can be square or conical. The length of the first section accounts for 20% to 40% of the total length.
This effectively avoids stress concentration, reduces damage to the light guide structure, improves stability during production and transportation, and enhances light utilization and image quality.
Smart Images
Figure CN223966716U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical module technology, and in particular to a light guide structure, a light-emitting module and an LED display screen. Background Technology
[0002] like Figure 6 As shown, in some existing LED displays, the light guide structure includes a lens 100 and a light guide post 200. One end of the light guide post 200 is connected to the light incident surface 110 of the lens 100. The LED light source enters from the light incident end of the light guide post 200. The light guide post 200 mixes the incident LED light source and transmits it to the lens 100, where it is then converged by the lens 100.
[0003] During production or transportation, the optical guide structure is tilted to the side on the load-bearing plane, specifically as follows: Figure 7 As shown, the sidewall of lens 100 and the light-inlet end of light guide post 200 simultaneously contact the supporting plane. However, existing light guide posts 200 are generally rods with sharp edges and a polygonal cross-section with pointed corners, such as square light guide posts. When such light guide posts 200 are placed on the supporting plane, the sharp corners of the light-inlet end of the light guide post 200 are prone to stress concentration and damage, which is detrimental to the production and transportation of light guide structures. Utility Model Content
[0004] The main purpose of this utility model is to provide a light guide structure, a light-emitting module, and an LED display screen, aiming to solve the technical problem that the sharp corners at the light-inlet end of the light guide column are prone to stress concentration and damage, which is detrimental to the production and transportation of the light guide structure.
[0005] To achieve the above objectives, the first aspect of this utility model provides an optical guide structure, comprising:
[0006] A lens, wherein the lens has an incident light surface and an exit light surface;
[0007] The light guide column is a polygonal columnar structure. The light guide column has a first section and a second section. The end of the first section is connected to the beginning of the second section, and the end of the second section is connected to the light incident surface. The cross section of the first section perpendicular to its own center line is a polygon with rounded corners at each corner.
[0008] Optionally, the light guide post is a square columnar structure.
[0009] Optionally, the cross-section of the second segment perpendicular to its own center line is a rectangle with two rounded corners located at the top of the rectangle.
[0010] Optionally, the fillet radius of the second segment is the same as the fillet radius of the end of the first segment.
[0011] Optionally, the second section has a sloped sidewall between the two side edges that is inclined away from the center line; in the part of the second section where the slope is provided, the cross section perpendicular to its own center line gradually increases in the direction close to the lens; the slope extends to the end face of the second section that connects to the light-incident surface.
[0012] Optionally, the light guide post is cone-shaped, and the cross-sections of the first segment and the second segment perpendicular to their own center lines gradually increase in size along the direction close to the lens.
[0013] Optionally, the radius of the rounded corners of the first section gradually decreases along the direction closer to the lens.
[0014] Optionally, the length of the first segment accounts for 20% to 40% of the total length of the light guide post.
[0015] The second aspect of this utility model discloses a light-emitting module, including an LED light source and the light guide structure described in the first aspect, wherein the LED light source is disposed on the side of the first section away from the lens.
[0016] The third aspect of this utility model discloses an LED display screen, including the light-emitting module described in the second aspect above.
[0017] The technical solution provided by this utility model can include the following beneficial effects:
[0018] In the light guide structure provided by this utility model, the beginning of the first section is the light-inlet end of the light guide post. The cross-section of the first section of the light guide post perpendicular to its own center line is a polygon with rounded corners at all angles, that is, the sidewalls of the first section are rounded. Thus, the corners of the light-inlet end of the light guide post are rounded rather than sharp. When the light guide structure is placed on a supporting plane, the contact between the beginning of the first section and the supporting plane can effectively avoid stress concentration, thereby avoiding damage and facilitating the production and transportation of the light guide structure. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 This is a three-dimensional schematic diagram of the optical guide structure of this utility model;
[0021] Figure 2 This is a rear view of the optical guide structure of this utility model;
[0022] Figure 3This is a schematic diagram of the optical path transmission of the optical guide structure of this utility model;
[0023] Figure 4 This is a schematic cross-sectional view of the first section of the optical guide structure of this utility model;
[0024] Figure 5 This is a cross-sectional schematic diagram of the second section of the optical guide structure of this utility model;
[0025] Figure 6 This is a schematic diagram of a current optical guide structure.
[0026] Figure 7 A schematic diagram of an existing optical guide structure placed on a bearing plane;
[0027] In the attached diagram: 100 - lens, 110 - light-incident surface, 120 - light-outceasing surface, 200 - light guide column, 210 - first section, 220 - second section, 230 - inclined plane, 300 - LED light source. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0031] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0032] The following is combined Figure 1 This invention describes a light guide structure disclosed in the first aspect of the present invention, comprising:
[0033] Lens 100, wherein the lens 100 is provided with an incident light surface 110 and an exit light surface 120;
[0034] A light guide post 200, which is a polygonal columnar structure, is provided with a first segment 210 and a second segment 220. The end of the first segment 210 is connected to the beginning of the second segment 220, and the end of the second segment 220 is connected to the light incident surface 110. Figure 4 As shown, the cross section of the first segment 210 perpendicular to its own center line is a polygon with rounded corners at all corners.
[0035] In the light guide structure provided by this utility model, the beginning of the first segment 210 is the light-inlet end of the light guide post 200. The cross-section of the first segment 210 of the light guide post 200 perpendicular to its own center line is a polygon with rounded corners at all angles, that is, the sidewalls of the first segment 210 are rounded. Thus, the corners of the light-inlet end of the light guide post 200 are rounded rather than sharp. When the light guide structure is placed on a supporting plane, the contact between the beginning of the first segment 210 and the supporting plane can effectively avoid stress concentration, thereby avoiding damage and facilitating the production and transportation of the light guide structure.
[0036] Specifically, the lens 100 and the light guide post 200 are made of a highly transparent material, such as acrylic. The lens 100 can be a symmetrical lens 100 or an asymmetrical lens 100. The light-emitting surface 120 of the lens 100 can be a standard sphere, a quadratic sphere, or a freeform surface. A standard sphere is a surface formed by rotating a semicircle about its radius; a quadratic sphere is a surface formed by rotating a parabola, ellipse, hyperbola, or other quadratic curve about its axis of symmetry. The light-incident surface 110 of the lens 100 can be a plane or have a surface recessed towards the light-emitting surface 120 in the middle. In some optional embodiments, the light guide post 200 can be any one of a triangular prism, a square prism, a pentagonal prism, or a hexagonal prism, and the light guide post 200 and the lens 100 are integrally formed.
[0037] Preferably, the light guide post 200 has a square columnar structure. For example... Figure 5 As shown, the cross-section of the second segment 220 perpendicular to its center line is a rectangle with two rounded corners, located at the top of the rectangle. Sharp right angles allow the images to seamlessly overlap, like a kaleidoscope. Rounded corners, however, create gaps at the joints between images. When the cross-section of the light guide column 200 is rectangular, its mirrored image is also rectangular. The two top corners of the rectangle are determined by the shapes of the two bottom corners of the second segment 220, and similarly, the two bottom corners are determined by the shapes of the two top corners of the second segment 220. In an LED display screen, it is desirable that the projected image has maximum left and right angles on the horizontal plane, meaning there should be no gaps at the top two corners of the image. Therefore, this embodiment retains sharp right angles at the bottom of the second segment 220. The rounded corners at the top of the second segment 220 only affect the bottom of the image, and the requirements for the bottom two corners are not as stringent, so rounded corners are permissible. Rounding the top corners of the second segment 220 also reduces the number of edges in the second segment 220, lowering the possibility of edge stress concentration damage. Furthermore, rounded corners can be directly processed using a precision engraving machine, while sharp right angles require slow wire cutting, which takes longer to process than rounded corners. This embodiment reduces the number of edges in the second segment 220, thus shortening the processing time.
[0038] Further optionally, the fillet radius of the second segment 220 is the same as the fillet radius of the end of the first segment 210. Specifically, in the actual processing, a precision engraving machine can be used. After the fillet of the end of the first segment 210 is processed, the fillet of the second segment 220 is processed according to the size of the fillet of the end of the first segment 210.
[0039] In an optional embodiment of the present invention, the second section 220 has a slope 230 on the side wall between the two side edges that is inclined away from the center line; in the part of the second section 220 where the slope 230 is provided, the cross section perpendicular to its own center line gradually increases in the direction close to the lens 100; the slope 230 extends to the end face of the second section 220 that connects to the light-inlet surface 110.
[0040] like Figure 3 As shown, in this embodiment, due to the setting of the inclined surface 230, some light rays are not reflected on the inclined surface 230 after total internal reflection on the opposite side of the inclined surface 230. Instead, they are transmitted along the original direction to the light-emitting end face of the light guide post and then enter the lens 100 for deflection.
[0041] The beneficial effects of this embodiment are explained using an outdoor LED display screen, such as an LED traffic signal display screen. Upward-biased emitted light is ineffective and can cause light pollution. The emitted light should be deflected downwards into the lower visible area as much as possible to improve light utilization. Therefore, in this embodiment, the inclined surface 230 is located below the second section 220. Some light rays, after being reflected upwards, do not reflect again on the inclined surface 230, but instead are conducted along their original direction to the light-emitting end face of the light guide post, and finally enter the lens 100 at an angle downwards for deflection. The deflected light reduces the downward tilt, and the light emitted from the lens 100 still maintains an downward tilt or is close to horizontal, allowing the light to be concentrated downwards into the lower visible area, thus improving light utilization.
[0042] In an optional embodiment of this invention, the light guide post 200 is conical, and the cross-sections of the first segment 210 and the second segment 220 perpendicular to their own center lines gradually increase in size along the direction approaching the lens 100. This results in the light guide post 200 having a conical column structure. Since the light guide post 200 needs to convert a point light source into a uniform surface light source, the conical column structure of the light guide post 200, through its gradual change in shape, can more effectively scatter light, reduce local bright spots or dark areas, and achieve uniform light output. Specifically, optionally, the sidewalls of the first segment 210 and the second segment 220 are one-to-one corresponding on the same plane to avoid large abrupt changes in cross-section between the first segment 210 and the second segment 220.
[0043] In an optional embodiment of this utility model, the radius of the rounded corners of the first segment 210 gradually decreases along the direction approaching the lens 100. Since the light guide post 200 is conical, as the cross-section of the first segment 210 gradually increases, the radius of the rounded corners gradually decreases, which is beneficial for mitigating the uncertainty of light reflection and improving the light mixing effect. In a specific embodiment, both the starting and ending faces of the first segment 210 are rectangles with rounded corners. The length of the rectangle on the starting face is 3.5 mm, the width is 2 mm, and the radius of the rounded corners of the four rounded corners on the starting face is 0.7 mm. The distance from the starting face to the ending face of the first segment 210 is 3 mm, and the radius of the rounded corners of the four rounded corners of the ending face is 0.6 mm.
[0044] In one optional embodiment of this utility model, the length of the first segment 210 accounts for 20% to 40% of the total length of the light guide post 200. Specifically, in one specific embodiment, the length of the first segment 210 is 3mm, and the total length of the light guide post 200 is 10.4mm.
[0045] The second aspect of this utility model discloses a light-emitting module, including an LED light source 300 and any of the light guide structures disclosed in the first aspect of this utility model. The LED light source 300 is disposed on the side of the first section 210 away from the lens 100. The light emitted by the LED light source 300 enters the light guide post 200 from the beginning of the first section 210, then travels to the second section 220 and is emitted from the lens 100. The light-emitting module has the advantages of the aforementioned light guide structure, which will not be elaborated further.
[0046] The third aspect of this utility model also discloses an LED display screen, including the light-emitting module disclosed in the second aspect of this utility model. The LED display screen has the advantages of the above-mentioned light guide structure, which will not be elaborated further.
[0047] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.
Claims
1. A light guide structure, characterized in that: include: A lens, wherein the lens has an incident light surface and an exit light surface; The light guide column is a polygonal columnar structure. The light guide column has a first section and a second section. The end of the first section is connected to the beginning of the second section, and the end of the second section is connected to the light incident surface. The cross section of the first section perpendicular to its own center line is a polygon with rounded corners at each corner.
2. The optical guide structure according to claim 1, characterized in that: The light guide column is a square columnar structure.
3. The optical guide structure according to claim 2, characterized in that: The cross-section of the second section perpendicular to its own center line is a rectangle with two rounded corners, the two rounded corners being located at the top of the rectangle.
4. The optical guide structure according to claim 3, characterized in that: The fillet radius of the second section is the same as the fillet radius of the end of the first section.
5. The optical guide structure according to claim 3, characterized in that: The second section has a sloped surface on the sidewall between the two side edges, which is inclined away from the center line; in the part of the second section where the sloped surface is provided, the cross section perpendicular to its own center line gradually increases in the direction close to the lens; the sloped surface extends to the end face of the second section that connects to the light-incident surface.
6. The optical guide structure according to claim 1, characterized in that: The light guide post is cone-shaped, and the cross-sections of the first and second sections perpendicular to their own center lines gradually increase in size along the direction close to the lens.
7. The optical guide structure according to claim 1, characterized in that: The radius of the rounded corners in the first section gradually decreases as it approaches the lens.
8. The optical guide structure according to claim 1, characterized in that: The length of the first segment accounts for 20% to 40% of the total length of the light guide column.
9. A light-emitting module, characterized in that, It includes an LED light source and a light guide structure as described in any one of claims 1-8, wherein the LED light source is disposed on the side of the first section away from the lens.
10. An LED display screen, characterized in that, Includes the light-emitting module as described in claim 9.