Optical module, display screen, display system, and traffic information system

Abstract

The present invention relates to the technical field of optical display, and specially to an optical module, a display screen comprising the optical module, a display system, and a traffic information system. The optical module comprises a light source assembly, a first optical assembly, and a second optical assembly. Light emitted from the first optical assembly enters the second optical assembly through a first surface and exits through a second surface, wherein the first surface is a flat surface, whereas the second surface is a curved surface; and the curved surface enables the light to present a convergence effect in a longitudinal direction along a second axis. The optical module provided in the present invention features uniform light emission and high light emission efficiency, and by means of adjusting the distribution of light in the longitudinal direction, the light can be deflected downward into a visible region as much as possible, thereby improving the emission efficiency of the light. When external interfering light, such as sunlight, enters a lens, at least some of the incident external light can be guided to a non-visible region via a light trap, thereby reducing light interference and enhancing display contrast.

Description

Optical modules, displays, display systems and traffic information systems

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202510632229.5, filed on May 15, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of optical display technology, and particularly to optical modules, displays including the optical modules, display systems, and traffic information systems. Background Technology

[0004] LED displays have advantages such as high brightness, modularity, flexibility, high efficiency and low power consumption, enabling them to provide large-size displays and be widely used in outdoor scenarios, especially in sports, advertising, finance, exhibitions, transportation and other fields.

[0005] For information displayed in outdoor settings, it is necessary to ensure sufficient clarity over a considerable distance and adequate legibility under varying outdoor lighting conditions. Existing outdoor LED displays often fail to adequately consider the unique characteristics of outdoor scenarios, such as the viewer's position and outdoor lighting conditions. Consequently, the luminous efficacy of existing outdoor LEDs is low, or the contrast is poor in strong outdoor light. Summary of the Invention

[0006] This paper presents an optical module, as well as a display screen, display system, and traffic information system using the optical module. The aim is to improve display performance, such as enhancing light emission efficiency and / or improving the contrast of outdoor displays.

[0007] To achieve the above objectives, a first aspect discloses an optical module, including a light source assembly, a first optical assembly, and a second optical assembly, wherein,

[0008] Light source assembly, used to emit light;

[0009] A first optical component has a proximal end near the light source component, a distal end away from the light source component, and a middle section extending from the proximal end to the distal end along a first axis; the first optical component includes a light guide portion that receives light emitted from the light source component from the proximal end, and the light entering the light guide portion is mixed in the light guide portion and then emitted.

[0010] The light guide portion has a cross-section in a transverse direction perpendicular to the first axis, and the edge contour of the cross-section is polygonal; in the direction along the first axis toward the distal end, the light guide portion has the same or larger cross-section.

[0011] The second optical component includes a first surface near the distal end of the first optical component and a second surface away from the first optical component; light emitted from the first optical component enters the second optical component from the first surface and exits from the second surface; the first surface is a plane and the second surface is a curved surface, the curved surface causing the light to converge in the longitudinal direction along a second axis, wherein the second axis is perpendicular to the first surface and passes through the center point of the first surface.

[0012] Modern LED light sources are often small in size relative to the overall chip (device). When used for large-screen displays (e.g., outdoor displays), uniform homogenization is crucial to prevent color shifts. Furthermore, light loss can occur during homogenization, necessitating optimized optical structures to improve light output efficiency. This solution incorporates a light guide section where light from the light source (e.g., multi-color light from different LED elements) is thoroughly mixed and propagated outwards along the guide's direction. The first surface of the second optical component is planar, allowing for minimal loss of mixed light reception from the light guide without altering its direction. The second surface is curved, causing a converging effect along the longitudinal direction of the second axis. This allows light from various directions within the light guide to converge into beams directed towards the viewer's field of vision, ensuring visibility from as far as possible and achieving optimal display performance.

[0013] In some embodiments, the first axis may be parallel to the second axis.

[0014] In some embodiments, the first axis may be located above the second axis.

[0015] Placing the second axis below the first axis allows more light from the light guide to be deflected downwards. When the observer is actually positioned below the display screen, this deflection allows more light to enter the observer's eyes, improving light source efficiency and display quality.

[0016] In some embodiments, the light guide portion of the first optical component may be a solid structure formed of a light guide material with uniform density.

[0017] In some embodiments, the first optical component may include a tubular structure, which may include an outer wall and an inner wall surrounding the first axis; the light guide may be a hollow channel formed by the inner wall; the inner wall may have mirror properties, and light entering the light guide is transmitted in the light guide and reflected on the inner wall.

[0018] In some embodiments, the light guide portion may include a section with a gradually increasing cross-section in the direction along the first axis toward the distal end.

[0019] The gradually increasing cross-section of the light guide section facilitates greater total internal reflection of light at its interface or inner wall. This results in more thorough light mixing and reduced light loss. Furthermore, it allows light transmitted through the light guide section to strike the second optical component at a better angle, thus making fuller use of the second optical component's converging properties. In addition, the increased cross-section contributes to a more robust connection with the second optical component, reducing breakage, and is also beneficial for installation and integration into the display surface when building larger displays.

[0020] In some embodiments, the light guide portion may have at least two segments connected to each other in a direction along the first axis toward the distal end, the at least two segments satisfying the following:

[0021] Of the at least two segments, the segment closer to the proximal end has a faster cross-sectional area increase.

[0022] In some embodiments, the light guide portion may have a longitudinal profile in the longitudinal direction along the first axis; in the longitudinal profile, the light guide portion may include a portion having an opening-shaped profile that gradually increases in the direction of the first axis toward the distal end.

[0023] In some embodiments, the light guide portion may have at least two portions connected to each other in a direction along the first axis toward the distal end, and the at least two portions may satisfy the following two conditions:

[0024] At least one of the at least two portions has a longitudinal section with a linearly or non-linearly increasing opening profile;

[0025] Of the at least two portions, the longitudinal section of the portion closer to the proximal end has an opening profile that increases in size more rapidly, meaning that the angle between the opening and the first axis is larger.

[0026] In some embodiments, the light guide may be provided with a light trap; when external light enters the second surface of the second optical component in a first direction and passes through the second optical component into the first optical component, the light trap prevents at least a portion of the light entering the first optical component from being emitted again from the second optical component into the visible area; wherein, the first direction includes a direction that forms an acute angle with the second axis from above the second axis; the visible area includes the area located below the second axis outside the second surface of the second optical component.

[0027] A light trap, as the name suggests, causes light entering it to fall into the trap, thus reducing or eliminating its influence on the light emitted from the light source component. Since light itself cannot fall into the trap, the "falling" should be understood to include, but is not limited to, light absorption, light reflection in a specific direction, and / or refraction, as long as it can prevent the influence of external light emitted from non-light source components on the light emitted from the light source component.

[0028] In some embodiments, a light trap can be configured with specific optical structures, devices, or materials to cause external light to undergo optical effects at the light trap, thereby eliminating or reducing the amount of light entering the viewer's field of vision. These optical effects may include, but are not limited to, propagation, refraction, reflection, and light absorption.

[0029] When outdoor light enters through the second optical component, at least a portion of the light entering the light trap will not be re-emitted into the observer's field of vision, thereby improving the contrast of the outdoor display under sunlight and enhancing its outdoor display effect. Compared to traditional outdoor display solutions, this solution avoids the contrast degradation caused by strong outdoor light conditions, preventing viewers from clearly seeing the information displayed on the screen. In some important applications, such as when the display is used outdoors to present instructions, prompts, or warnings, this solution can prevent the contrast degradation caused by strong outdoor light, allowing viewers to effectively obtain this important display information.

[0030] In some embodiments, the light guide portion may be a solid structure formed of an isotropic and uniformly dense light guide material; the light trap may include a first reflective surface disposed in the light guide portion near the far end, when external light enters the second surface of the second optical component in a first direction and enters the light guide portion through the second optical component, at least a portion of the light is reflected at the first reflective surface and can be emitted from the light guide portion to a non-visible area outside the optical module, and at least a portion of the light is refracted at the first reflective surface and can be emitted directly from the light guide portion to the non-visible area.

[0031] In some embodiments, the light guide portion may have a longitudinal profile in the longitudinal direction along the first axis; in the longitudinal profile, the first reflective surface may include a downwardly linearly increasing opening-shaped lower profile.

[0032] In some embodiments, the first optical component may include a tubular structure, the tubular structure may include an outer wall and an inner wall surrounding the first axis; the light guide may be a hollow channel formed by the inner wall; the inner wall may have mirror properties, and light entering the light guide may be transmitted in the light guide and reflected on the inner wall; the light trap may include a notch structure provided near the distal end of the light guide, the notch structure may include a channel located below the first axis and penetrating downward through the inner wall and outer wall of the first optical component; when external light enters the second surface of the second optical component in a first direction and passes through the second optical component to enter the first optical component, at least a portion of the light can be emitted from the channel of the notch structure to a non-visible area outside the optical module.

[0033] Besides allowing external light to exit the optical module through the notch structure, another advantage of the notch structure is that it facilitates greater downward deflection of light from the light source component. Without the notch structure, some light emitted from the light source component and entering the light guide will be reflected and deflected upwards at the lower inner wall near the far end, thus not entering the viewer's effective field of vision. With the notch structure, this portion of light will exit downwards through the notch structure's channel to the lower half of the second optical component, ultimately entering the viewer's visible area, thus enhancing the light extraction efficiency of the visible area.

[0034] In some embodiments, the projection of the focal point or principal focal point corresponding to the convergence effect of the second optical component in the longitudinal direction onto the first axis may be located in the projection region of the channel of the notch structure onto the first axis.

[0035] This design allows sunlight directed towards the lens to pass through the notch structure and out of the optical module as much as possible, thus preventing sunlight from shining on the outdoor display screen and causing a decrease in display contrast.

[0036] In some embodiments, a portion of the surface of the channel of the notch structure can form a second reflective surface, which is disposed opposite to the second surface of the second optical component; when external light enters the second surface of the second optical component in a first direction and passes through the second optical component to enter the first optical component, at least a portion of the light can be reflected at the second reflective surface and then emitted through the channel to a non-visible area outside the optical module.

[0037] The presence of the second reflective surface allows more of the outdoor light incident on the reflective surface to escape outside the optical module and / or into the non-visible area, further ensuring that outdoor light does not cause a decrease in contrast.

[0038] In some embodiments, the second optical component may be a converging lens.

[0039] In some embodiments, the converging lens may include an upper lens and a lower lens located above and below the second axis, respectively, wherein the focal length or principal focal length of the upper lens may be shorter than the focal length or principal focal length of the lower lens.

[0040] When the second surface of the second optical component has a single focal point in the longitudinal section, the focal point should be understood as that single focal point; when the second surface of the second optical component has more than two focal points in the longitudinal section, the focal point can refer to at least one of the multiple focal points, the principal focal point of the multiple focal points, or the average focal point of the multiple focal points.

[0041] The term "primary focus" can be understood as the value that plays a major role or is relatively important among multiple median values, or it can be understood as the value determined by a weighted calculation of multiple values. For example, when the longitudinal section of the upper lens includes multiple focal points, the primary focus can be the focal point corresponding to the radius of curvature closest to the second axis, or it can be the focal point obtained by weighting multiple focal points according to their respective weights.

[0042] The focal length or principal focal length of the upper lens in the longitudinal direction is shorter than that of the lower lens in the longitudinal direction, so that more light rays entering the upper lens are deflected downwards and refracted below the second axis after passing through the lens.

[0043] In some embodiments, the first axis of the first optical component may be parallel to and higher than the second axis of the second optical component.

[0044] By placing the second axis below the first axis, more outdoor light entering the optical component is also deflected downwards, thus entering the light trap more effectively. This further improves the contrast of the outdoor display under sunlight and enhances the outdoor display effect.

[0045] In some embodiments, the first optical component and the second optical component may be integrally formed, for example, by injection molding.

[0046] The second aspect disclosed herein is an optical module, including a light source assembly, a first optical assembly, and a second optical assembly, wherein,

[0047] The first optical component has a proximal end near the light source component, a distal end away from the light source component, and a middle section extending from the proximal end to the distal end along a first axis; the first optical component includes a light guide portion, which receives light emitted from the light source component from the proximal end, and the light entering the light guide portion is mixed in the light guide portion and then emitted to enter the second optical component;

[0048] The incident surface of the second optical component is a plane, and the exit surface of the second optical component is a curved surface. The curved surface causes the light to converge in the longitudinal direction along the second axis, wherein the second axis is perpendicular to the incident surface and passes through the center point of the incident surface.

[0049] The first axis is parallel to the second axis, and the first axis is located above the second axis.

[0050] In some embodiments, the portion of the second optical component above the second axis can be an upper lens, and the portion below the second axis can be a lower lens; the focal length of the upper lens can be shorter than the focal length of the lower lens. In other words, the radius of curvature of the upper lens can be smaller than the radius of curvature of the lower lens.

[0051] The third aspect disclosed herein is an optical module, including a light source assembly, a first optical assembly, and a second optical assembly, wherein,

[0052] The first optical component has a proximal end near the light source component, a distal end away from the light source component, and a middle section extending from the proximal end to the distal end along a first axis; the first optical component includes a light guide portion, which receives light emitted from the light source component from the proximal end, and the light entering the light guide portion is mixed in the light guide portion and then emitted to enter the second optical component;

[0053] The incident surface of the second optical component is a plane, and the exit surface of the second optical component is a curved surface. The curved surface causes the light to converge in the longitudinal direction along the second axis, wherein the second axis is perpendicular to the incident surface and passes through the center point of the incident surface.

[0054] A light trap is provided on the light-emitting side of the light guide (i.e., the far end of the light guide that is far from the light source assembly).

[0055] In some embodiments, the light trap may be located on the lower side or below the light guide.

[0056] In some embodiments, when the light guide portion is a solid structure formed of an isotropic and uniformly dense light guide material, the light trap may include a first reflective surface disposed in the light guide portion near the distal end.

[0057] In some embodiments, the light guide portion may be a hollow channel formed by the inner wall; the light trap may include a notch structure provided in the light guide portion near the distal end.

[0058] The fourth aspect proposes a display screen that includes the optical modules proposed in the first aspect. For example, the display screen can be formed by assembling multiple optical modules in a dot matrix pattern. For example, each optical module can be a display screen pixel.

[0059] The fifth aspect here proposes a display system, which includes a display screen and a screen control system, wherein the display screen includes the optical module proposed in the first aspect of the present invention, and the screen control system is used to control the information display operation of the display screen.

[0060] The sixth aspect proposes a traffic information system, which includes a display system for displaying traffic information and a central control system for controlling the display of the traffic information, wherein the display system includes a display screen equipped with the optical module proposed in the first aspect.

[0061] The provided technical solution may include at least one of the following beneficial effects:

[0062] 1. Uniform light output and high light output efficiency.

[0063] 2. In the provided display lens optical module, the vertical distribution of light can be adjusted so that the light is deflected downwards into the visible area as much as possible, thereby improving the light emission efficiency.

[0064] 3. For external interference light, such as sunlight, entering the lens, at least a portion of the incoming external light can be guided to non-visible areas through light traps, reducing light interference and enhancing display contrast. Attached Figure Description

[0065] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0066] Figure 1 is a schematic diagram of the optical module frame of the present invention;

[0067] Figure 2A is a side view of the optical module of the first optical component with a solid structure according to the present invention;

[0068] Figure 2B is a side view of the optical module of the first optical component with a hollow channel according to the present invention;

[0069] Figure 3 is a schematic diagram showing the change of the cross-section of the light guide portion of the present invention along the first axis;

[0070] Figure 4A is a schematic diagram showing that the cross-sectional profile of the second optical component of the present invention in the horizontal direction is a symmetrical convex surface;

[0071] Figure 4B is a schematic diagram showing that the cross-sectional profile of the second optical component of the present invention in the horizontal direction is a symmetrical concave surface;

[0072] Figure 4C is a schematic diagram showing that the cross-sectional profile of the second optical component of the present invention in the horizontal direction is an asymmetrical convex surface;

[0073] Figure 4D is a schematic diagram showing that the cross-sectional profile of the second optical component of the present invention is a symmetrical convex surface in the longitudinal direction;

[0074] Figure 4E is a schematic diagram showing that the cross-sectional profile of the second optical component of the present invention is an asymmetrical convex surface in the longitudinal direction;

[0075] Figure 5A is a schematic diagram showing the change of the cross-section of the light guide portion of the present invention along the first axis direction;

[0076] Figure 5B is another schematic diagram showing the change of the cross-section of the light guide portion of the present invention along the first axis direction;

[0077] Figure 5C is another schematic diagram showing the change of the cross-section of the light guide portion of the present invention along the first axis direction;

[0078] Figure 6A is a schematic diagram of a longitudinal section of the light guide portion of the present invention along the first axis;

[0079] Figure 6B is another schematic diagram of the longitudinal section of the light guide portion of the present invention along the first axis;

[0080] Figure 6C is another schematic diagram of the longitudinal section of the light guide portion of the present invention along the first axis;

[0081] Figure 7 is a schematic diagram of the spatial position between the outdoor display screen of the present invention and the viewer;

[0082] Figure 8A is a schematic diagram of the light path emitted by the light source assembly along the first axis when the first axis of the light guide part and the second axis of the lens are located on the same horizontal plane.

[0083] Figure 8B is a schematic diagram of the light path emitted by the light source assembly along the first axis when the first axis of the light guide portion of the present invention is parallel to and higher than the second axis of the lens;

[0084] Figure 8C is a schematic diagram of the light path through the focal point F1 of the upper lens and the focal point F2 of the lower lens when the first axis of the light guide part and the second axis of the lens are on the same horizontal plane and the upper lens has a smaller curvature or focal length than the lower lens.

[0085] Figure 8D is a schematic diagram of the light path through the focal point F1 of the upper lens and the focal point F2 of the lower lens when the first axis of the light guide part of the present invention is parallel to the second axis of the lens and the upper lens has a smaller curvature or focal length than the lower lens.

[0086] Figure 9A is a schematic diagram of the solid light guide section of the present invention having a first reflective surface;

[0087] Figure 9B is a light path diagram of external sunlight entering the embodiment of Figure 9A;

[0088] Figure 10A is an exemplary structural schematic diagram of the light guide portion of the solid structure of the present invention having a light trap;

[0089] Figure 10B is a schematic diagram of another exemplary structure of the solid light guide portion of the present invention with a light trap;

[0090] Figure 10C is a schematic diagram of another exemplary structure of the solid light guide portion of the present invention with a light trap;

[0091] Figure 10D is a schematic diagram of another exemplary structure of the solid light guide portion of the present invention with a light trap;

[0092] Figure 10E is a schematic diagram of another exemplary structure of the optical trap of the optical module with a solid structure light guide of the present invention;

[0093] Figure 11A is a three-dimensional schematic diagram of the light guide part of the present invention being a hollow channel with a notch structure;

[0094] Figure 11B is a light path diagram of external sunlight entering the notch structure after entering the upper lens of the embodiment in Figure 11A;

[0095] Figure 11C is a light path diagram of external sunlight entering the notch structure after entering the lower lens of the embodiment in Figure 11A;

[0096] Figure 12 is a schematic diagram showing that the focal point of the upper lens of the present invention falls on the projection area K in the longitudinal section.

[0097] Figure 13A shows the optical path diagram of light emitted from a hollow channel without a notch structure in the light guide section.

[0098] Figure 13B is a light path diagram of light emitted from a hollow channel with a notch structure in the light guide section;

[0099] Figure 14A is a schematic diagram of the notch structure of the present invention having a second reflective surface;

[0100] Figure 14B is a light path diagram of external sunlight entering the notch structure after entering the second optical component of the embodiment in Figure 14A.

[0101] Figure 14C is a longitudinal cross-sectional view along the first axis of the embodiment of Figure 14A;

[0102] Figure 15A shows the simulation results of the light emitted after sunlight enters the optical module in Test Example 1.

[0103] Figure 15B is a simulation result of the light emitted from the light source assembly in Test Example 1 after passing through the first optical assembly and the second optical assembly.

[0104] Figure 16A shows the simulation results of the light emitted after sunlight enters the optical module in Test Example 2.

[0105] Figure 16B is a simulation result of the light emitted from the light source assembly in Test Example 2 after passing through the first optical assembly and the second optical assembly.

[0106] Figure 17A shows the simulation results of the light emitted after sunlight enters the optical module in Test Example 3.

[0107] Figure 17B is a simulation result of the light emitted from the light source assembly in Test Example 3 after passing through the first optical assembly and the second optical assembly.

[0108] Figure 18A shows the simulation results of the light emitted after sunlight enters the optical module in Test Example 4.

[0109] Figure 18B shows the simulation results of the light emitted from the light source assembly in Test Example 4 after passing through the first and second optical components.

[0110] In the attached diagram: light source assembly 1, first optical assembly 2, near end 21, middle section 22, far end 23, first axis 24, light guide 25, cross section 251, section 252, first section 2521, second section 2522, first reflecting surface 253, notch structure 254, channel 2541, second reflecting surface 255, tubular structure 26, outer wall 261, inner wall 262, second optical assembly 3, first surface 31, second surface 32, second axis 33, intermediate component 4. Detailed Implementation

[0111] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0112] It should be noted that in this invention, if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," or "circumferential" appear, the orientation or positional relationship indicated by these terms should be interpreted as the relative positional relationship and movement of the components in a specific posture (e.g., as shown in the accompanying drawings, or relative to a specific installation method). If the specific posture changes, the directional indication will also change accordingly. This is for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0113] In this invention, the terms "connection" and "fixation," when used, should be interpreted broadly. For example, "fixation" 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 connection of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0114] In this invention, if a description such as "above" or "below" the second feature appears, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0115] In this invention, the term "comprising" should be understood as the latter being a subset of the former, without requiring the latter to necessarily be a proper subset of the former. Taking "A comprises B" as an example, it should be understood to include two cases: "A comprises B and other constituent components besides B" and "A comprises only B".

[0116] Furthermore, in this invention, 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, a feature 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 invention.

[0117] This invention proposes an optical module, as shown in Figure 1, comprising a light source assembly 1, a first optical assembly 2, and a second optical assembly 3. Light emitted from the light source assembly 1 enters the first optical assembly 2, where it undergoes refraction and reflection. The reflected light mixes with each other and enters the second optical assembly 3 from the first optical assembly 2. The second optical assembly has a converging effect in the longitudinal direction along its axis, thereby converging the light entering the second optical assembly 3 before emitting it.

[0118] A light source assembly 1 is used to emit light. In embodiments, the light source assembly 1 may be a light-emitting diode (LED), an organic light-emitting diode (OLED), a sub-millimeter light-emitting diode (Mini LED), and / or a micro light-emitting diode (Micro LED). The light source assembly 1 may include, but is not limited to, solid-state LED light sources (such as LEDs or laser diodes (or “diode lasers”)). The light source assembly 1 may involve a single light source or multiple light sources, and correspondingly, the LEDs may also include a single LED or multiple LEDs.

[0119] The light source component 1 may include monochromatic light sources and multicolor light sources. For example, a blue light source, a green light source, or a red light source. When the light source component 1 is an LED, it may be a monochromatic LED or a full-color LED.

[0120] In an embodiment, the light source assembly 1 may include a chip-on-board (COB) light source. The term "COB" specifically refers to an LED in the form of a semiconductor chip, where the LED light-emitting device is neither packaged nor connected, but rather directly mounted on a substrate such as a printed circuit board (PCB). Therefore, multiple semiconductor light sources (multiple LED light-emitting devices) can be configured on the same substrate. In an embodiment, the COB may be a chip with multiple LED light-emitting devices configured as a single lighting module. For example, a COB light source may have at least three LED light-emitting devices emitting blue, green, and red light respectively, thereby producing a full-color lighting effect under the control of the chip.

[0121] In this embodiment, the light source component 1 may be a surface-mount LED.

[0122] As shown in Figures 2A and 2B, the first optical component 2 has a proximal end 21 near the light source component 1, a distal end 23 away from the light source component 1, and a middle section 22 extending from the proximal end to the distal end along a first axis 24; the first optical component 2 includes a light guide 25, which receives light emitted from the light source component 1 from the proximal end 21, and the light entering the light guide is mixed in the light guide and then emitted.

[0123] In the embodiment shown in Figure 2A, the first optical component 2 is a solid structure, and the light guide 25 is also a solid structure of the first optical component 2. That is, the first optical component 2 itself constitutes the light guide 25, so the symbol 25 is not shown in the figure. In the embodiment shown in Figure 2B, the first optical component 2 is a tubular structure, and the light guide 25 is a hollow channel enclosed by the tubular structure of the first optical component 2. The hollow channel in the first optical component 2 indicated by the dashed line is the light guide 25.

[0124] The light guide portion 25 has a cross-section 251 along a direction perpendicular to the first axis 24. The edge contour of the cross-section is polygonal, such as a triangle, quadrilateral, pentagon, etc. The cross-section 251 can be a symmetrical or asymmetrical shape. In the direction along the first axis 24 toward the distal end 23, the light guide portion 25 has the same or larger cross-section 251'. This means that the cross-section of the light guide portion 25 may remain constant, or the cross-section of the light guide portion closer to the distal end 23 may be larger than the cross-section closer to the proximal end 21 (as shown in Figure 3). The cross-section can increase gradually or discontinuously.

[0125] Figure 3 illustrates the possible variations in the cross-section of the light guide portion 25 of the first optical component 2 along the first axis. As shown in Figure 3, the light guide portion 25 has a cross-section 251 along a direction perpendicular to the first axis 24, and the outline of the cross-section 251 is polygonal; the light guide portion has a larger cross-section 251' in the direction along the first axis 24 toward the distal end 23. This means that the cross-section of the light guide portion is largest at the distal end 23.

[0126] When the cross-section of the light guide is a polygon, any side of the polygon either remains unchanged or becomes longer along the first axis 24 toward the far end 23, thereby ensuring that the light guide 25 has the same or larger cross-section 251.

[0127] Figure 3 shows that the cross-section 251' at the distal end 23 is larger than the cross-section 251 at the middle section 22, and the cross-section 251 at the middle section 22 is larger than the cross-section 251" at the proximal end 21, but this is only an example. As long as the cross-section of the light guide closer to the distal end 23 is larger than the cross-section closer to the proximal end 21, it should be understood that it is within the design concept of the present invention. The outline of the light guide is shown by a dashed line in Figure 3. The dashed line shows the way the cross-section changes continuously and linearly. It should be understood that the design of the present invention also includes ways in which the cross-section changes non-linearly. For example, the upper and lower edges of the longitudinal section of the light guide along the first axis direction satisfy a quadratic curve function in the axial direction. For example, the longitudinal section is shaped like a square trumpet opening.

[0128] As shown in Figures 2A and 2B, the second optical component 3 includes a first surface 31 near the distal end 23 of the first optical component and a second surface 32 away from the first optical component. The second optical component 3 has a second axis 33. The second axis 33 is perpendicular to the first surface 31 and passes through the center point of the first surface 31. For example, when a portion of the second optical component 3 is a cylinder (the first surface 31 is circular), the second axis 33 is the line connecting the centers of the cylinders (central axis of symmetry). Light rays emitted from the first optical component enter the second optical component 3 from the first surface 31 and exit from the second surface 32.

[0129] The first surface 31 is planar, and the second surface 32 is curved. This curved surface causes light to converge along the longitudinal direction of the second axis 33, which is perpendicular to the first surface 31 and passes through the center point of the first surface 31. The converging effect refers to the phenomenon that light is deflected towards the principal optical axis when passing through an optical element (here, the second optical component). When the principal optical axis is the second axis, after the light is emitted from the first optical component and converged by the second optical component, it is deflected towards the second axis, thus converging along the longitudinal direction of the second axis.

[0130] The second optical component 3 can be a converging lens.

[0131] The second optical component 3 can be a flat lens, with the first surface 31 being a plane and the second surface 32 being a curved surface.

[0132] The second surface 32 can be a sphere or an aspherical surface. Aspherical surfaces include, but are not limited to, quadratic surfaces and freeform surfaces. A quadratic surface can be understood as a surface formed by rotating a quadratic curve such as a parabola, ellipse, or hyperbola around an axis of symmetry. A freeform surface can be understood as a surface that does not have axial rotational symmetry or translational symmetry constraints.

[0133] The second surface 32 can be a symmetrical or asymmetrical surface. In an embodiment, the second surface 32 can be symmetrical in the horizontal direction and asymmetrical in the longitudinal direction along the second axis 33.

[0134] The second surface 32 can be a curved surface that has a converging effect in the longitudinal direction along the second axis 33. In the horizontal direction, the second surface 32 can be designed according to actual needs, for example, it can have a converging effect, a diverging effect, or a combination of both.

[0135] Figures 4A, 4B, 4C, 4D, and 4E show the outlines of the second optical component in the horizontal and vertical directions, respectively.

[0136] Figures 4A, 4B, and 4C show the cross-sectional profiles of the second optical component in the horizontal direction as symmetrical convex, symmetrical concave, and asymmetrical convex surfaces, respectively; Figures 4D and 4E show the cross-sectional profiles of the second optical component in the longitudinal direction as symmetrical convex and asymmetrical convex surfaces, respectively. It should be understood that these are merely exemplary cross-sectional profiles of the second optical component. According to the design concept of the present invention, the second optical component can, according to actual needs, have convex and / or concave surfaces in the horizontal direction to achieve converging and / or diverging effects; and in the longitudinal direction, the second optical component can have convex surfaces to achieve a converging effect.

[0137] The light source assembly 1 and the proximal end 21 of the first optical assembly 2 can be closely adjacent, such as attached or close together, or they can be spaced apart, such as maintaining a distance or having other components or devices in between. In either case, it is ensured that at least a portion of the light emitted from the light source assembly 1 directly or indirectly enters the light guide portion of the first optical assembly 2.

[0138] The light source assembly 1 and the light guide 25 can be positioned facing each other or not facing each other.

[0139] The center of the light source assembly 1 can be located on the first axis 24.

[0140] The projection of the light-emitting surface of the light source assembly 1 onto the plane of the cross section 251 of the light guide has an overlapping area with the cross section 251, so that at least a portion of the light emitted from the light source assembly 1 enters the light guide 25.

[0141] In the optical module of the present invention, at least one first optical component 2 is configured for each light source component 1; and at least one second optical component 3 is configured for each first optical component 2.

[0142] In the embodiment, each light source component 1 is configured with a first optical component 2 and a second optical component 3. The center of the light source component 1 is located on the first axis 24 of the first optical component 2, and the light emitting surface of the light source component 1 is located in the projection area of ​​the light guide portion 25 along the axis, so that the first optical component 2 can receive the light emitted by the light source component 1 as much as possible.

[0143] In this embodiment, the light source component 1 is sufficiently close to the first optical component 2 so that the first optical component can receive the light emitted by the light source component 1 to the greatest extent.

[0144] The positional relationship between the distal end 23 of the first optical component 2 and the second optical component 3 allows light emitted from the light guide 25 to enter the second optical component 3. The first axis 24 of the first optical component 2 is parallel to the second axis 33 of the second optical component 3.

[0145] The distal end 23 of the first optical component 2 can be tightly fitted to the second optical component 3. The distal end 23 of the first optical component 2 can also be connected to the second optical component 3 through an intermediate component, so that the light emitted from the light guide 25 can enter the second optical component 3 as much as possible. As shown in Figures 9A and 9B.

[0146] In some embodiments, along the first axis 24, the cross sections of the first optical component 2 and the second optical component 3 at their close contact point are coplanar.

[0147] The light guide portion 25 can be a solid structure, for example, formed of a certain material. The light guide rod 25 can be made of an isotropic, uniformly dense material. In the embodiments, the material of the light guide portion 25 can be plastic, such as polycarbonate or polymethyl methacrylate, or it can be a material such as glass or silicone.

[0148] When the light guide portion 25 is a solid structure, it has an interface that forms the outer contour of the solid structure. According to the design of the present invention, the light guide portion 25 has a polygonal cross-section along a direction perpendicular to the first axis 24, so that the interface of the light guide portion 25 along the first axis is planar. Light emitted from the light source assembly 1 enters the light guide portion 25, and at least a portion of the light is reflected and refracted at the interface of the light guide portion 25. The reflected light continues to propagate within the light guide portion 25, while the refracted light exits from the interface and propagates outside the light guide portion 25. Therefore, light transmission within the light guide portion 25 is attenuated at the interface, and light mixing also occurs within the light guide portion 25 due to the change in the original transmission direction caused by reflection at the interface.

[0149] The light guide 25 can also be a hollow channel, for example, a hollow channel enclosed by a tubular structure, which includes an outer wall and an inner wall surrounding the first axis 24. The inner wall has mirror-like properties. The hollow channel is filled with a medium, such as air. The mirror-like property means that when light reaches this wall, most of the light is reflected at that point, resulting in minimal light loss. The inner wall with mirror-like properties often has a highly smooth surface, i.e., a high-gloss polished plane, thus exhibiting high reflectivity.

[0150] When the light guide section 25 is a hollow channel, the hollow channel is enclosed by the inner wall of a tubular structure. Light emitted from the light source assembly 1 enters the light guide section 25, and at least a portion of the light is reflected at the inner wall. The reflected light continues to propagate within the light guide section 25, and the reflection at the inner wall alters the propagation direction of some of the light, causing mixing within the light guide section 25. To reduce light loss at the inner wall, the inner wall should have a highly reflective mirror-like characteristic, thereby enhancing light reflection at the inner wall.

[0151] In order to better guide the light in the light guide 25, for example to obtain a desired mixing effect or a desired exit angle effect, so that when the light leaves the first optical component 2 and enters the second optical component 3, the optical characteristics of the second optical component 3 can be effectively utilized to achieve a long-distance visibility effect, the light guide 25 of the present invention has the following features.

[0152] The light guide portion 25 has a cross-section 251 along a direction perpendicular to the first axis 24. The edge contour of the cross-section is polygonal, such as a triangle, quadrilateral, pentagon, etc. The cross-section 251 can be a symmetrical or asymmetrical shape. In the direction along the first axis 24 toward the distal end 23, the light guide portion 25 has the same or larger cross-section 251' (Figure 3 shows the case with a larger cross-section 251'). This means that the cross-section of the light guide portion 25 may remain constant; or, the cross-section of the light guide portion closer to the distal end 23 may be larger than the cross-section closer to the proximal end 21, and the cross-section may increase gradually or discontinuously.

[0153] The light guide can be symmetrical or asymmetrical about the first axis.

[0154] The light guide can be either a solid structure or a hollow channel. The key is that light entering the light guide from the light source assembly 1 is primarily reflected at the interface or inner wall, causing the light to mix after multiple reflections. The mixed light then enters the second optical assembly from the light guide. Therefore, whether the light guide is a solid structure or a hollow channel, it has a cross-section. Figures 5A, 5B, 5C, 6A, 6B, and 6C exemplarily illustrate variations in the cross-section of the light guide. These examples of variations are applicable to both solid structures and hollow channel light guides.

[0155] As shown in Figures 5A, 5B, and 5C, the light guide portion 25 includes a segment 252 with a gradually increasing cross-section 251 along the direction from the first axis 24 toward the distal end 23. The gradual increase in the cross-section 251 of the light guide portion 25 can be linear or non-linear, and is therefore represented by dashed lines. That is, the dashed lines do not limit the lines (e.g., edges) connecting the vertices of different cross-sections to be straight lines.

[0156] Section 252 may be part of the light guide section 25.

[0157] For example, as shown in Figure 5A, one end of segment 252 is located at the proximal end 21 of the first optical component 2, and the other end is located at the middle segment 22.

[0158] In an embodiment, the cross-section of the light guide portion 25 relative to another portion of the segment 252 may remain unchanged or may be increased.

[0159] Section 252 can also be the entire light guide section 25.

[0160] As shown in Figure 5B, the cross-section 251 of the light guide portion 25 gradually increases from the near end 21 to the far end 23 along the first axis 24.

[0161] In the direction along the first axis 24 toward the distal end 23, the light guide portion 25 may include at least two segments connected to each other, wherein the cross-section 251 of each segment may increase at a rate that is partially the same or different. In some embodiments, the cross-section 251 of the segment closer to the proximal end 21 increases faster.

[0162] Taking the light guide portion 25 as an example, which includes two sections, as shown in Figure 5C, the light guide portion 25 includes a first section 2521 and a second section 2522 connected thereto. Along the direction of the first axis 24, the cross-section of the first section 2521 increases faster than that of the second section 2522.

[0163] The structural features of the light guide for light transmission and adjustment can be reflected by the changes in its cross-section and / or described by the characteristics of its longitudinal section (horizontal longitudinal section and / or vertical longitudinal section).

[0164] The light guide portion 25 has a cross-section 251 along a direction perpendicular to the first axis 24. The edge contour of the cross-section is polygonal, such as a triangle, quadrilateral, pentagon, etc. The cross-section 251 can be a symmetrical or asymmetrical shape. In the direction along the first axis 24 towards the distal end 23, the light guide portion 25 has a larger cross-section 251', as shown in FIG3. This means that the cross-section of the light guide portion 25 closer to the distal end 23 is larger than the cross-section closer to the proximal end 21, and the cross-section can gradually increase or discontinuously increase. In the longitudinal direction along the first axis 24, the light guide portion 25 has a vertical longitudinal section, i.e., a section along the first axis in the vertical direction. In the vertical longitudinal section, the light guide portion includes a portion with an opening-shaped contour that gradually increases in the direction towards the distal end along the first axis.

[0165] In the horizontal direction along the first axis 24, the light guide portion 25 also has a horizontal longitudinal section, that is, a section along the first axis in the horizontal direction. In the horizontal longitudinal section, the light guide portion may include a portion having a contour portion that remains uniform along the first axis toward the distal end and / or a gradually increasing opening-shaped contour portion.

[0166] The light guide can be symmetrical or asymmetrical about the first axis.

[0167] The light guide can be either a solid structure or a hollow channel. The key is that light entering the light guide from the light source assembly 1 is primarily reflected at the interface or inner wall, causing the light to mix after multiple reflections. The mixed light then enters the second optical assembly from the light guide. Therefore, whether the light guide is a solid structure or a hollow channel, it has a cross-section and a longitudinal section. Figures 6A, 6B, and 6C exemplarily illustrate the implementation of the longitudinal section of the light guide. These variations are applicable to both solid structures and hollow channel light guides. Figures 6A, 6B, and 6C show the longitudinal section (horizontal and / or vertical) of the light guide along the first axis 24. Based on the design concept of this invention, those skilled in the art can also determine other similar implementations of the horizontal and / or vertical longitudinal sections.

[0168] In the longitudinal direction of the first axis 24, the light guide portion 25 has a longitudinal section; in the longitudinal section, the light guide portion 25 includes a segment 252, which has an opening-shaped profile that gradually increases in size along the first axis 24 toward the distal end 23, as shown in Figures 6A, 6B and 6C.

[0169] The gradual increase in the opening profile of the longitudinal section of the light guide 25 can be linear or non-linear, and is therefore represented by a dashed line. The dashed line does not necessarily mean that the upper and lower edges of the longitudinal section are straight lines. The upper and lower edges of the longitudinal section can be one or more types of straight lines, quadratic curves, etc.

[0170] Section 252 may be part of the light guide section 25.

[0171] One end of segment 252 is located at the near end 21 of the first optical component 2, and the other end is located at the middle segment 22, as shown in Figure 6A.

[0172] Section 252 can also be the entire light guide section 25.

[0173] As shown in Figure 6B, the longitudinal section of the light guide 25 gradually increases in size from the near end 21 to the far end 23 along the first axis 24.

[0174] In the direction along the first axis 24 toward the distal end 23, the light guide portion 25 has at least two segments connected to each other, the at least two segments satisfying the following: at least one of the at least two segments has a longitudinal profile with a linearly or non-linearly increasing opening profile; and in the at least two segments, the opening rate of the opening profile of the longitudinal profile of each segment is partially the same or different, for example, the longitudinal profile of the segment closer to the end 21 may have an opening profile with a faster opening rate.

[0175] Taking the light guide portion 25 as an example, which includes two sections, as shown in Figure 6C, the light guide portion 25 includes a first section 2521 and a second section 2522 connected thereto. Along the direction of the first axis 24, the opening of the first section 2521 increases faster than the opening of the second section 2522.

[0176] A key difference between outdoor and indoor displays is that, in outdoor applications, viewers are typically farther from the actual location where the displayed information is presented. In outdoor displays, to allow more viewers to see the information from a greater distance, the display device, such as a screen, is usually placed at a certain height. As shown in Figure 7, the viewer is actually positioned slightly below the screen. To improve light source efficiency and display quality, the light distribution needs to be adjusted according to the viewer's actual position so that more of the emitted light is distributed within the viewer's line of sight.

[0177] When the first axis 24 of the light guide and the second axis 33 of the lens are parallel and located on the same horizontal plane, as shown in Figure 8A; when the first axis 24 of the light guide is parallel and horizontally higher than the second axis 33 of the lens, as shown in Figure 8B. To illustrate the effect of the first axis 24 being parallel and horizontally higher than the second axis 33 on the emitted light, a special light ray emitted from the light source assembly 1 is selected to observe the difference. A light ray emitted from the light source assembly 1 that coincides with the first axis 24 is selected, as shown in Figure 8A. According to the principle of the lens, since this light ray coincides with the axis of the lens in the horizontal direction, it exits the lens along the axial direction of the lens, that is, in the horizontal direction. In Figure 8B, a light ray emitted from the light source assembly 1 that coincides with the first axis 24 is also selected. When the light reaches the second surface of the lens, since the second axis 33 is parallel and horizontally lower than the first axis 24, the light ray is parallel and horizontally higher than the second axis 33. After the light passes through the second surface of the lens, it will be deflected downwards and refracted out. It can be seen that when the axis of the light guide is higher than the axis of the lens, at least a portion of the light will be deflected downwards, for example, light that is parallel to the first axis 24 and located above the second axis 33.

[0178] In principle, because lenses have a converging effect, the upper half of the lens above the lens axis will converge light rays downwards, while the lower half will converge light rays upwards. Therefore, distributing more incident light within the upper half of the lens will cause more light rays to be deflected downwards.

[0179] In order to further guide the light to be distributed below the second axis 33, the second surface 32 of the second optical component 3 is an optical surface with a converging effect in the longitudinal direction of the second axis 33. The part above the second axis 33 is called the upper lens, and the part below the second axis 33 is called the lower lens. The focal length of the upper lens in the longitudinal direction is shorter than that of the lower lens in the longitudinal direction, so that more light rays entering the upper lens are deflected downwards and refracted into the area below the second axis 33 after passing through the lens.

[0180] When the upper lens and / or lower lens have a unique focal length in the longitudinal direction, the focal length should be understood as that unique focal length; when the upper lens and / or lower lens have multiple focal lengths, the focal length can refer to at least one of the multiple focal lengths, the principal focal length of the multiple focal lengths, or the average focal length of the multiple focal lengths.

[0181] The average can be calculated using methods such as arithmetic average, geometric average, etc.

[0182] The term "primary focal length" can be understood as the value that plays a major role or is relatively important among multiple median values, or it can be understood as the value determined by weighted calculation of multiple values. For example, when the longitudinal profile of the upper lens includes 5 focal lengths, the primary focal length can be the focal length closest to the second axis 33, or it can be the focal length obtained by weighting the 5 focal lengths according to their respective weights.

[0183] In an embodiment, as shown in Figures 8C and 8D, the radius of curvature of the longitudinal section of the second surface of the upper lens is smaller than the radius of curvature of the longitudinal section of the lower lens.

[0184] When the second surface of the upper lens and / or the lower lens has a unique radius of curvature in the longitudinal section, the radius of curvature should be understood as that unique radius of curvature; when the upper lens and / or the lower lens has more than two radii of curvature in the longitudinal section, the radius of curvature can refer to at least one of the multiple radii of curvature, the principal radius of curvature of the multiple radii of curvature, or the average radius of curvature of the multiple radii of curvature.

[0185] The term "principal radius of curvature" can be understood as the value that plays a major role or is relatively important among multiple median values, or it can be understood as the value determined by weighted calculation of multiple values. For example, when the longitudinal section of the upper lens includes 5 radii of curvature, the principal radius of curvature can be the radius of curvature closest to the second axis 33, or it can be the radius of curvature obtained by weighting the 5 radii of curvature according to their respective weights.

[0186] When the radius of curvature of the longitudinal section of the upper lens is smaller than that of the longitudinal section of the lower lens, or when the longitudinal focal length of the upper lens is smaller than that of the lower lens, the light entering the upper lens will be deflected downwards more.

[0187] Taking the example where the longitudinal focal length of the upper lens is smaller than that of the lower lens, as shown in Figure 8C, the longitudinal focal point of the upper lens is F1, and the longitudinal focal point of the lower lens is F2. F1 is closer to the lens than F2. To illustrate the effect of the longitudinal focal length of the upper lens being smaller than that of the lower lens on the outgoing light rays, a specific outgoing light ray is selected to observe the difference. Assuming that the light emitted from the light source assembly comes from at least one point source, then countless light rays emitted from that point source undergo multiple reflections in the light guide section. Selecting the light ray passing through focal point F1 and the light ray passing through focal point F2, according to the lens principle, the light ray emitted from the focal point is emitted as a parallel beam after passing through the lens. Therefore, the light ray emitted from F1 is emitted as a parallel beam after passing through the upper lens, while the light ray emitted from F2 is emitted as a parallel beam after passing through the lower lens, as shown in Figure 8C. Furthermore, according to the lens principle, when a light ray passing through a point located on the axis of the lens and between the near end 21 and F1 directly strikes the second surface of the lens, the outgoing light ray will be deflected downwards. As can be seen, when F1 is closer to the lens, the distance between F1 and the near end increases, which will guide more light rays to be deflected downwards. Similarly, when F2 is farther away from the lens, the distance between F2 and the near end decreases, which will prevent more light rays from being deflected upwards.

[0188] By translating the second axis 33 of the second optical component downwards parallel to the first axis 24 of the first optical component, and by making the radius of curvature / focal length of the upper lens smaller than that of the lower lens in the longitudinal direction, or a combination of both methods, it is possible to make the light entering the second optical component from the first optical component more deflected downwards, so that more light enters the viewer's field of vision.

[0189] When the first axis 24 is parallel to the second axis 33, and the radius of curvature / focal length of the upper lens is smaller than that of the lower lens, the light will be further deflected downwards, as shown in Figure 8D. Compared with Figure 8C, the light passing through the first axis of the light guide will be deflected downwards.

[0190] Another important difference between outdoor and indoor displays is that outdoor displays are more affected by external light. When outdoor light is strong, the light entering the optical components is refracted and reflected, and some of the light escapes again from the optical components into the viewer's field of vision. This reduces the contrast of the displayed information within the viewer's field of vision, affecting the visual effect of the displayed information. Therefore, it is necessary to employ methods to prevent sunlight from entering the viewer's field of vision through the second optical components, thereby improving the contrast of the displayed information.

[0191] Considering that outdoor displays are typically installed above the viewer's level, and that sunlight usually originates above the display's level, a shading structure can be installed above the display to block some of the sunlight. However, since sunlight is usually assumed to originate from infinity and enter as parallel light, the shading structure can only block a limited amount of sunlight, thus its effect is relatively limited.

[0192] Considering that sunlight entering the first optical component after refraction from the second optical component can be refracted, a light trap can be set in the first optical component so that at least a portion of the sunlight entering the first optical component is trapped in the light trap, thereby preventing the sunlight from exiting the second optical component and entering the viewer's field of vision.

[0193] A light trap, as the name suggests, causes light entering it to fall into the trap, thus reducing or eliminating its influence on the light emitted from the light source component. Since light itself cannot fall into the trap, the "falling" should be understood to include, but is not limited to, light absorption, light reflection in a specific direction, and / or refraction, as long as it can prevent the influence of external light emitted from non-light source components on the light emitted from the light source component.

[0194] When external light enters the second surface of the second optical component in a first direction and passes through the second optical component into the first optical component, the light trap prevents at least a portion of the light entering the first optical component from exiting the second optical component into the visible area again; wherein, the first direction includes a direction that forms an acute angle with the second axis from above the second axis; the visible area includes the area located below the second axis outside the second surface of the second optical component.

[0195] The light trap in this invention, through the setting of specific optical structures, devices, or materials, allows external light to undergo optical effects at the light trap, thereby eliminating or reducing the amount of light entering the viewer's field of vision. These optical effects may include, but are not limited to, propagation, refraction, reflection, and light absorption.

[0196] The light guide portion can be a solid structure formed by an isotropic and uniformly dense light guide material; the light trap includes a first reflective surface disposed near the far end of the light guide portion. When external light enters the second surface of the second optical component in a first direction and passes through the second optical component into the light guide portion, at least a portion of the light is reflected at the first reflective surface and then emitted from the light guide portion to a non-visible area outside the optical module. Also, at least a portion of the light is refracted at the first reflective surface and then emitted directly from the light guide portion to the non-visible area.

[0197] In the longitudinal direction along the first axis, the light guide portion has a longitudinal profile; in the longitudinal profile, the first reflective surface includes a downwardly opening profile.

[0198] As shown in Figures 9A and 9B, the light guide portion 25 is a solid prism structure formed of an isotropic and uniformly dense light guide material, having a first axis 24, and a first reflective surface 253 is provided near the far end 23. On the longitudinal section along the first axis 24, the first reflective surface 253 of the light guide portion 25 includes an opening-shaped lower contour that linearly increases downward.

[0199] In the embodiment of the solid structure light guide shown in Figures 9A, 9B, 10A-10E, an intermediate member 4 is provided between the light guide 25 and the second optical component 3.

[0200] The intermediate component 4 can be formed by processing the second optical component 3 and integrated with the second optical component 3. By processing the intermediate component 4, the material used for the second optical component 3 can be saved, and an end that is easy to connect with the far end 23 of the light guide part 25 can be constructed.

[0201] The intermediate component 4 can be manufactured by integral injection molding with the second optical component 3.

[0202] The intermediate component 4 can also be a separate component, using the same material as the second optical component 3, with one end connected to the far end 23 of the light guide 25 and the other end connected to the first surface 31 of the second optical component 3.

[0203] The intermediate component 4 may have a light-absorbing material on its outer wall surrounding its axis. The intermediate component 4 may be made of the same material as the light guide 25, but because the outer wall of the intermediate component 4 is made of other materials, the intermediate component 4 is different from the light guide 25.

[0204] When outdoor sunlight enters the second surface 32 of the second optical component 3 at a first angle and passes through the second optical component 3 into the light guide section 25, at least a portion of the light is reflected at the first reflective surface 253 and then shines at the interface of the light guide section 25. At the interface, the light is refracted and emitted into the non-visible area outside the optical module, as shown in FIG9B. The light is also reflected at the interface and, upon reaching the interface again, is partially refracted into the non-visible area outside the optical module. Additionally, a portion of the light may be refracted at the first reflective surface and then emitted directly from the light guide section into the non-visible area (not shown).

[0205] The first reflecting surface can have various deformations, as shown in Figures 10A-10F.

[0206] As shown in Figure 10A, the light trap of the light guide 25 includes two planes connected to each other in the axial direction, and the two planes have different inclination angles relative to the horizontal plane. For example, one of the planes may be parallel to the horizontal plane.

[0207] As shown in Figure 10B, the light trap of the light guide 25 includes two planes connected to each other in a direction perpendicular to the axial direction. The two planes may have the same or different inclination angles to the horizontal plane.

[0208] As shown in Figure 10C, the light trap of the light guide 25 includes multiple planes connected to each other.

[0209] As shown in Figure 10D, the light trap of the light guide 25 includes a first reflective surface, and a protrusion is provided on the first reflective surface.

[0210] As shown in Figure 10E, the first reflective surface can be set on the intermediate part 4. Accordingly, the first reflective surface should be a smooth plane, and no other material layer is provided on the smooth plane.

[0211] As mentioned above, the light guide can also be a hollow channel. The first optical component may include a tubular structure comprising an outer wall and an inner wall surrounding a first axis; the light guide is a hollow channel formed by the inner wall; the inner wall has a highly reflective mirror-like characteristic, and light entering the light guide is transmitted within the light guide and reflected on the inner wall. The light trap includes a notch structure located near the distal end of the light guide, the notch structure comprising a channel located below the first axis and penetrating downwards through the inner and outer walls of the first optical component; when external light enters the second surface of the second optical component in a first direction and passes through the second optical component to enter the first optical component, at least a portion of the light escapes from the channel of the notch structure towards a non-visible area outside the optical module.

[0212] The mirror-like properties can be achieved through processes such as coating, electroplating, and film application on the inner wall.

[0213] As shown in Figures 11A, 11B, and 11C, the first optical component 2 includes a tubular structure 26, which includes an outer wall 261 and an inner wall 262 surrounding the first axis 24; the light guide 25 is a hollow channel formed by the inner wall 262; the inner wall 262 has mirror properties, and the light entering the light guide 25 is transmitted in the light guide 25 and reflected on the inner wall 262; the light trap includes a notch structure 254 provided near the distal end 23 of the light guide, and the notch structure 254 includes a channel 2541 located below the first axis 24 and penetrating downward through the inner wall 262 and the outer wall 261.

[0214] When external light enters the second surface of the second optical component in a first direction and passes through the second optical component to enter the first optical component, at least a portion of the light rays exit from the channel of the notch structure 254 to the non-visible area outside the optical module, as shown in Figures 11B and 11C.

[0215] In order to allow more external light entering from the second optical component to leave the optical module through the notch structure, the position of the notch structure can be adjusted so that the projection of the focal point of the second optical component on the first axis in the longitudinal section falls as much as possible into the projection area of ​​the channel of the notch structure on the first axis.

[0216] When the second surface of the second optical component has a single focal point in the longitudinal section, the focal point should be understood as that single focal point; when the second surface of the second optical component has more than two focal points in the longitudinal section, the focal point can refer to at least one of the multiple focal points, the principal focal point of the multiple focal points, or the average focal point of the multiple focal points.

[0217] The term "primary focus" can be understood as the value that plays a major role or is relatively important among multiple median values, or it can be understood as the value determined by a weighted calculation of multiple values. For example, when the longitudinal section of the upper lens includes 5 focal points, the primary focus can be the focus corresponding to the radius of curvature closest to the second axis 33, or it can be the focus obtained by weighting the 5 focal points according to their respective weights.

[0218] When the second optical component is a longitudinally asymmetric converging lens, it includes an upper lens above the second axis and a lower lens below the second axis. Since sunlight mainly strikes the lens at an angle that is approximately parallel to the distance above the second axis, the notch structure can be configured such that the projection of the focal point of the upper lens of the second optical component on the first axis in the longitudinal section falls as much as possible into the projection area of ​​the channel entrance of the notch structure on the first axis, thereby allowing sunlight striking the upper lens to exit the optical module from the channel of the notch structure as much as possible.

[0219] As shown in Figure 12, the position of the notch structure 254 is set so that the projection of the focal point of the second optical component on the first axis 24 in the longitudinal section falls as much as possible into the projection area K of the cross section of the notch structure on the first axis 24.

[0220] As shown in Figure 12, the position of the notch structure 254 is set so that the projection of the focal point of the upper lens of the second optical component on the first axis 24 in the longitudinal section falls as much as possible into the projection area K of the cross section of the notch structure on the first axis 24.

[0221] Besides allowing external light to exit the optical module through the notch structure, another advantage of the notch structure is that it facilitates greater downward deflection of light from the light source component. As shown in Figure 13A, without the notch structure, light emitted from the light source component and entering the light guide section 25 will be reflected and deflected upwards at the lower inner wall 262 near the far end 23, thus not entering the viewer's effective field of vision. With the notch structure, as shown in Figure 13B, this portion of light will exit downwards through the channel of the notch structure into the lower half of the second optical component, ultimately entering the viewer's visible area, thus enhancing the light extraction efficiency of the visible area.

[0222] External sunlight enters the second optical component at a certain angle and in a roughly parallel manner from a distant region above the second axis. A portion of the sunlight incident on the lower lens is refracted and enters the first optical component. To further reduce this sunlight, the notch structure can be further adjusted so that the projection of the focal point of the lower lens of the second optical component on the first axis 24 in the longitudinal section falls as far as possible outside the projection area of ​​the notch structure's channel on the first axis 24. This allows a portion of the external sunlight entering the second optical component to be reflected at the notch structure's channel due to being blocked by the notch structure, and thus exit through the upper lens.

[0223] If the focal point of the lower lens of the second optical component is located within the projection area of ​​the notch channel on the first axis in the longitudinal section, a portion of the external sunlight entering from the lower lens will enter the first optical component through the channel of the notch structure. After multiple reflections, it will eventually mix with the light emitted by the light source component and enter the second optical component, reducing the contrast of the light from the light source component.

[0224] However, when the second optical component is a symmetrical lens in the longitudinal direction, a contradiction arises: it is impossible to ensure that the projection of the focal point of the upper lens falls as close as possible to the projection area of ​​the channel entrance of the notch structure on the first axis, while at the same time ensuring that the projection of the focal point of the lower lens falls as far outside the projection area as possible.

[0225] Based on this consideration, when the lens has a single focal point on the longitudinal section, the focal point needs to be located on the perpendicular line L of point A at the channel entrance of the notch structure 254, where point A is the point farthest from the second optical component on the horizontal section profile of the channel entrance (as shown in Figure 14C). This requires very high precision and is often difficult to achieve in engineering applications.

[0226] Therefore, to better reduce external sunlight entering the light guide, the second optical component can employ a longitudinally asymmetrical lens. This ensures that the projection of the focal point of the upper lens on the first axis in the longitudinal section falls as close as possible to the projection area of ​​the notch structure's channel on the first axis, and that the projection of the focal point of the lower lens on the first axis 24 falls as far as possible outside the projection area of ​​the notch structure's channel on the first axis. In this case, most of the parallel light incident on the upper lens from above will be directly incident on the notch channel and exit the first optical component, while most of the parallel light incident on the lower lens will be reflected at the surface of the notch structure's channel.

[0227] To further guide the parallel light from the lower lens from the notch structure to outside the first optical component, a portion of the surface of the channel of the notch structure constitutes a second reflective surface. This second reflective surface is positioned opposite to the second surface of the second optical component and is tilted clockwise at a certain angle relative to the first axis. When external light enters the second surface of the second optical component in a first direction and passes through the second optical component to enter the first optical component, at least a portion of the light is reflected at the second reflective surface and then emitted through the channel to a non-visible area outside the optical module. See Figures 14A and 14B.

[0228] As shown in Figure 14B, a portion of the surface of the channel of the notch structure 254 constitutes a second reflective surface 255. The second reflective surface 255 is disposed opposite to the second surface 32 of the second optical component and is tilted at a certain angle clockwise relative to the first axis. When sunlight enters the second optical component in the first direction and enters the first optical component 2, a portion of the light is reflected from the second reflective surface 255 and then emitted through the channel to the non-visible area outside the optical module.

[0229] As shown in Figure 14C, when the second optical component has a single focal point, the focal point can be located on the perpendicular line L of point A at the channel entrance of the notch structure 254, where point A is the point farthest from the second optical component on the horizontal cross-sectional profile of the channel entrance.

[0230] When the focal point of the second optical component is not unique, the lens can include more than one longitudinally discrete focal point, allowing most of the focal points to project onto the first axis and fall within the projection area K of the channel entrance of the notch structure on the first axis. This allows most of the sunlight entering the second optical component from the outside to exit through the channel of the notch structure. Furthermore, it allows light entering from the lower hemisphere of the lens to converge as much as possible to the second reflecting surface of the light trap, whereby the second reflecting surface reflects this portion of the light to the outside of the second optical component.

[0231] When the upper and lower lenses have different focal points, the projection of the focal point of the upper lens onto the first axis can fall into the projection area K of the channel entrance of the notch structure on the first axis, and the focal point of the lower lens can fall outside the projection area K and be closer to the light source assembly along the first axis, so that the external light illuminating the lower lens is focused as much as possible onto the second reflective surface of the light trap, and the second reflective surface reflects this part of the light to the outside of the light guide.

[0232] In an embodiment, as shown in Figures 14A, 14B and 14C, the optical module includes a light source assembly 1, a first optical assembly 2 and a second optical assembly 3, wherein the first optical assembly 2 includes a light guide portion 25, and the second optical assembly includes an upper converging lens and a lower converging lens that are asymmetrical in the longitudinal direction. The first optical component 2 includes a tubular structure 26, which includes an outer wall 261 and an inner wall 262 surrounding a first axis 24. A light guide 25 is a hollow channel formed by the inner wall 262. The inner wall 262 has mirror properties. The light guide has a rectangular cross-section in a direction perpendicular to the first axis, and the rectangular cross-section gradually increases from the near end 21 to the far end 23 along the first axis. Light entering the light guide 25 is transmitted in the light guide 25 and reflected on the inner wall 262. The light guide 25 includes a notch structure 254 provided near the far end 23 of the light guide. The notch structure 254 includes a channel 2541 located below the first axis 24 and penetrating downward through the inner wall 262 and the outer wall 261. A portion of the surface of the channel 2541 of the notch structure 254 constitutes a second reflective surface 255. The second reflective surface 255 is disposed opposite to the second surface 32 of the second optical component and is tilted at a certain angle clockwise relative to the first axis.

[0233] The radius of curvature / focal length of the upper lens of the second optical component is smaller than that of the lower lens.

[0234] The first axis 24 of the first optical component is parallel to and higher than the second axis 33 of the second optical component.

[0235] The notch structure is configured to satisfy the following conditions: the projection of the focal point of the upper lens of the second optical component on the first axis 24 in the longitudinal section falls as close as possible to the projection area K of the channel opening of the notch structure on the first axis 24; and the projection of the focal point of the lower lens of the second optical component on the first axis 24 in the longitudinal section falls as close as possible to the projection area of ​​the channel opening of the notch structure, which is outside the projection area K of the first axis 24 and closer to the projection area of ​​the light source component. The channel opening is located at the junction of the channel 2541 and the hollow channel of the light guide 25.

[0236] The angle at which the second reflective surface is tilted is set to satisfy the condition that most of the light rays entering the lower hemisphere will be reflected at the second reflective surface 255 and then emitted through the channel to the non-visible area outside the optical module.

[0237] When sunlight enters the second optical component and then the first optical component 2 in the first direction, most of the light rays entering the upper hemisphere will leave the first optical component 2 directly through the channel 2541 of the notch structure and be directed to the non-visible area; most of the light rays entering the lower hemisphere will be reflected at the second reflective surface 255 and then be directed to the non-visible area outside the optical module through the channel.

[0238] The radius of curvature of the upper lens can be set to allow sunlight with an inclination angle to the first axis greater than a preset angle (e.g., 10 degrees) to be refracted through the upper lens into the notch structure.

[0239] The radius of curvature of the lower lens can be set so that sunlight entering from the second lens is refracted by the upper lens, reflected at the second reflecting surface, and then directly leaves the first optical component into the non-visible area.

[0240] In the embodiments, the outer wall contour of the second optical component with a tubular structure is not limited and can be cylindrical, pyramidal, prismatic, etc.

[0241] To demonstrate the effectiveness of the design of this invention in reducing the amount of incident sunlight emitted from the visible area, a series of simulation tests were conducted.

[0242] In the simulation software, the optical module is placed horizontally. A set of parallel lights tilted 10 degrees horizontally simulates sunlight incident on the second optical component. The second optical component is a lens, which is an asymmetric convex lens in the longitudinal direction and a symmetric converging lens in the horizontal direction. A light-collecting plane and a receiving sphere are placed in front of the lens. The light-collecting plane is used to observe the light intensity returning after the parallel light enters the lens, and the receiving sphere is used to observe the light intensity exiting the lens after the light emitted by the light source component passes through it.

[0243] The following four simulated test examples illustrate the positional relationship between the axes of the first and second optical components.

[0244] Test Example 1: The first axis of the first optical component and the second axis of the second optical component are horizontally aligned. No light trap is set in the light guide of the first optical component, and the focal point of the lens is located in the light guide of the first optical component.

[0245] Test Example 2: The change from Test Example 1 is that the first axis of the first optical component is parallel to and higher than the second axis of the second optical component.

[0246] Test Example 3: The change from Test Example 2 is that the position of the first surface of the lens is further adjusted, that is, the distance between the first surface and the second surface is increased, so that the focal point of the lens is located outside the light guide and between the first surface and the second surface of the lens. At this time, the distance between the light guide and the second surface of the lens increases.

[0247] Test Example 4: The change from Test Example 2 is that a light trap containing a reflective surface and a notch structure is provided in the light guide section of the first optical component.

[0248] Simulation results are shown in Figures 15A, 15B, 16A, 16B, 17A, 17B, 18A, and 18B, and in Table 1. These correspond to the light emitted after sunlight enters the optical module in Test Examples 1-4, and the light emitted from the light source assembly after passing through the first and second optical components. In the figures, blue lines (or ▲ lines) represent the vertical direction, and green lines (or ● lines) represent the horizontal direction. The horizontal axis represents angles; for the vertical direction, less than 0° indicates below the horizontal direction, and greater than 0° indicates above the horizontal direction. For the horizontal direction, the sides of 0° represent the left and right sides of the lens axis, respectively. The vertical axis represents light intensity; a larger value indicates stronger light intensity.

[0249] The data results for the four test cases are shown in Table 1. The light emission angle is defined as the position where the light intensity is equal to 50% of 0°.

[0250]

[0251] Table 1

[0252] For test case 1:

[0253] The simulation results obtained on the light-collecting surface and the light-collecting sphere are shown in Figures 15A and 15B, respectively. Figure 15A shows the light intensity of the simulated sunlight emitted through the optical module in the vertical and horizontal directions, and Figure 15B shows the light intensity of the light emitted from the light source assembly after passing through the light guide and lens in the vertical and horizontal directions. As shown in Figures 15A and 15B, due to the asymmetry of the lens in the longitudinal direction, the simulated sunlight and the light from the light source assembly have the strongest light intensity in the longitudinal direction between -5° and 0°. In the horizontal direction, the simulated sunlight and the light from the light source assembly are roughly symmetrical about the left and right sides of the lens axis.

[0254] As shown in Table 1, the maximum light intensity of the final emitted light (reflected sunlight) after the simulated sunlight passes through the optical module is 1.5 cd, while the light intensity at the center point of the lens is 215 cd. The horizontal light emission angle is ±15°, and the vertical light emission angle is +9° to -11°.

[0255] When the first axis of the light guide and the second axis of the lens coincide, the horizontal light emission angle is symmetrical, and the vertically opposite light emission angle is also relatively symmetrical. Simulating sunlight entering the lens, the light rays are refracted and enter the light guide. After multiple reflections within the light guide, at least a portion of the light will eventually exit the lens again into the visible area. This portion of the emitted sunlight will appear in the visible area along with the light from the light source, reducing the contrast of the light and thus worsening visibility.

[0256] For test case 2:

[0257] The simulation results obtained on the light-collecting surface and the light-collecting sphere are shown in Figures 16A and 16B, respectively. Figure 16A shows the light intensity of the simulated sunlight emitted through the optical module in the vertical and horizontal directions, and Figure 16B shows the light intensity of the light emitted from the light source assembly after passing through the light guide and lens in the vertical and horizontal directions. As shown in Figures 16A and 16B, since the first axis of the light guide is parallel to and higher than the second axis of the lens, the light emitted from both the simulated sunlight and the light source assembly is significantly shifted downward in the vertical direction. In the horizontal direction, the light emitted from both the simulated sunlight and the light source assembly remains roughly symmetrical about the left and right sides of the lens axis.

[0258] As shown in Table 1, the maximum light intensity of the simulated sunlight emitted after passing through the optical module (reflected sunlight) is 0.35 cd, while the light intensity at the center of the lens is 190 cd. The horizontal light emission angle is ±15°, and the vertical light emission angle is +4° to -18°. It can be seen that, keeping everything else unchanged but setting the first axis to be parallel to and higher than the second axis, the intensity of the simulated sunlight decreases by an order of magnitude, but a considerable amount of light still enters the target area after reflection.

[0259] For test case 3:

[0260] The simulation results obtained on the light-collecting surface and the light-collecting sphere are shown in Figures 17A and 17B, respectively. Figure 17A shows the light intensity of the simulated sunlight emitted through the optical module in the vertical and horizontal directions, while Figure 17B shows the light intensity of the light emitted from the light source assembly after passing through the light guide and lens in the vertical and horizontal directions. As shown in Figures 17A and 17B, because the first axis of the light guide is parallel to and higher than the second axis of the lens, and the focal point of the lens is located outside the light guide, the simulated sunlight does not enter the light guide, and the light intensity of the simulated sunlight emitted further shows a significant decrease. At the same time, because the focal point is not in the light guide, the light emission angle of the light source assembly becomes smaller; in the horizontal direction, the simulated sunlight and the light from the light source assembly are still roughly symmetrical about the left and right sides with respect to the axis of the lens.

[0261] As shown in Table 1, the maximum light intensity of the final emitted light (reflected sunlight) after the simulated sunlight passes through the optical module is 0.027 cd, while the light intensity at the center point of the lens is 165 cd. The horizontal light emission angle is ±12.5°, and the vertical light emission angle is +4° to -15°.

[0262] In Test Example 3, simulated sunlight does not enter the light guide, which partially solves the problem of reduced contrast. However, this makes the focal point farther away, resulting in a smaller originally designed light emission angle. It can be seen that both the horizontal and vertical light emission angles are reduced.

[0263] For test case 4:

[0264] The simulation results obtained on the light-collecting surface and the light-collecting sphere are shown in Figures 18A and 18B, respectively. Figure 18A shows the light intensity of the simulated sunlight emitted through the optical module in the vertical and horizontal directions, while Figure 18B shows the light intensity of the light emitted from the light source assembly after passing through the light guide and lens in the vertical and horizontal directions. As shown in Figures 18A and 18B, because the first axis of the light guide is parallel to and higher than the second axis of the lens, and the light guide has a light trap, a portion of the simulated sunlight is emitted through the notch structure of the light trap and exits outside the light guide without entering the visible area. Another portion of the simulated sunlight enters the reflective surface of the light trap, is reflected, and thus exits outside the light guide without entering the visible area. As shown in Figure 18A, the light intensity of the simulated sunlight emitted in both the vertical and horizontal directions shows a significant decrease; in the horizontal direction, the simulated sunlight and the light from the light source assembly remain roughly symmetrical about the axis of the lens.

[0265] As shown in Table 1, the maximum light intensity of the final emitted light (reflected sunlight) after the simulated sunlight passes through the optical module is 0.0041 cd, while the light intensity at the center point of the lens is 213 cd. The horizontal light emission angle is ±15°, and the vertical light emission angle is +3° to -17°.

[0266] In Test Example 4, by setting a notch structure in the light trap and a second reflective surface, sunlight can be effectively blocked from entering the mixing zone and being reflected and mixed, thus enhancing the contrast of the emitted light from the light source assembly. Simulated sunlight, after being refracted by the lens, either passes directly through the light trap below the light guide or is reflected at the second reflective surface. Only a very small amount of light can enter the light guide; after multiple reflections, most of this light is absorbed by the material, with only a small portion entering the visible area. The intensity of the simulated sunlight refracted by the lens and then exiting through the curved surface is lower than in Test Example 3, resulting in superior contrast.

[0267] Furthermore, since the light emitted from the light source is not reflected at the light trap position and is emitted directly from the lower lens, some light is avoided from being reflected upwards, thus better ensuring the downward light emission effect.

[0268] The present invention also proposes a display screen comprising the aforementioned optical module.

[0269] The present invention also proposes a display system, which includes a display screen and a screen control system, wherein the display screen includes, in some embodiments, a screen control system for controlling the information display operation of the display screen.

[0270] The present invention also proposes a traffic information system, which includes a display system for displaying traffic information and a central control system for controlling the display of the traffic information, wherein the display system includes a display screen equipped with the optical module as described above.

[0271] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An optical module, comprising a light source assembly, a first optical assembly, and a second optical assembly, characterized in that, Light source assembly, used to emit light; A first optical component has a proximal end near the light source component, a distal end away from the light source component, and a middle section extending from the proximal end to the distal end along a first axis; the first optical component includes a light guide portion that receives light emitted from the light source component from the proximal end, and the light entering the light guide portion is mixed in the light guide portion and then emitted. The light guide portion has a cross-section in a transverse direction perpendicular to the first axis, and the edge contour of the cross-section is polygonal; in the direction along the first axis toward the distal end, the light guide portion has the same or larger cross-section. The second optical component includes a first surface near the distal end of the first optical component and a second surface away from the first optical component; light emitted from the first optical component enters the second optical component from the first surface and exits from the second surface; the first surface is a plane and the second surface is a curved surface, the curved surface causing the light to converge in the longitudinal direction along a second axis, wherein the second axis is perpendicular to the first surface and passes through the center point of the first surface.

2. The optical module according to claim 1, characterized in that, The first axis is parallel to the second axis.

3. The optical module according to claim 2, characterized in that, The first axis is located above the second axis.

4. The optical module according to claim 1, characterized in that, The light guide portion of the first optical component is a solid structure formed of a light guide material with uniform density.

5. The optical module according to claim 1, characterized in that, The first optical component includes a tubular structure, which includes an outer wall and an inner wall surrounding the first axis; the light guide is a hollow channel formed by the inner wall; the inner wall has mirror properties, and light entering the light guide is transmitted in the light guide and reflected on the inner wall.

6. The optical module according to claim 4 or 5, characterized in that, The light guide portion includes a section with a gradually increasing cross-section in the direction along the first axis toward the distal end.

7. The optical module according to claim 6, characterized in that, In the direction along the first axis toward the proximal end, the light guide portion has at least two segments connected to each other, the at least two segments satisfying: Of the at least two segments, the segment closer to the proximal end has a faster cross-sectional area increase.

8. The optical module according to claim 4 or 5, characterized in that, In the longitudinal direction along the first axis, the light guide portion has a longitudinal section; in the longitudinal section, the light guide portion includes a portion having an opening-shaped profile that gradually increases in the direction of the first axis toward the distal end.

9. The optical module according to claim 8, characterized in that, In the direction along the first axis toward the distal end, the light guide portion has at least two parts connected to each other, and the at least two parts satisfy the following two conditions: At least one of the at least two portions has a longitudinal section with a linearly or non-linearly increasing opening profile; Of the at least two portions, the longitudinal section of the portion closer to the proximal end has an opening-shaped profile that increases in size more rapidly.

10. The optical module according to claim 2 or 3, characterized in that, The light guide portion is provided with a light trap; when external light enters the second surface of the second optical component in a first direction and passes through the second optical component into the first optical component, the light trap prevents at least a portion of the light entering the first optical component from being emitted again from the second optical component into the visible area; wherein, the first direction includes a direction that forms an acute angle with the second axis from above the second axis; the visible area includes the area located below the second axis outside the second surface of the second optical component.

11. The optical module according to claim 10, characterized in that, The light guide portion is a solid structure formed by an isotropic and uniformly dense light guide material; the light trap includes a first reflective surface disposed in the light guide portion near the far end; when external light enters the second surface of the second optical component in a first direction and passes through the second optical component into the light guide portion, at least a portion of the light is reflected at the first reflective surface and then emitted from the light guide portion to the non-visible area outside the optical module; and at least a portion of the light is refracted at the first reflective surface and then emitted directly from the light guide portion to the non-visible area.

12. The optical module according to claim 11, characterized in that, In the longitudinal direction along the first axis, the light guide portion has a longitudinal profile; in the longitudinal profile, the first reflective surface includes a downwardly linearly increasing opening-shaped lower profile.

13. The optical module according to claim 10, characterized in that, The first optical component includes a tubular structure, which includes an outer wall and an inner wall surrounding the first axis; the light guide is a hollow channel formed by the inner wall; the inner wall has mirror properties, and light entering the light guide is transmitted in the light guide and reflected on the inner wall; the light trap includes a notch structure provided near the distal end of the light guide, and the notch structure includes a channel located below the first axis and penetrating downward through the inner and outer walls of the first optical component; when external light enters the second surface of the second optical component in a first direction and passes through the second optical component to enter the first optical component, at least a portion of the light is emitted from the channel of the notch structure to a non-visible area outside the optical module.

14. The optical module according to claim 13, characterized in that, The projection of the focal point or main focal point corresponding to the convergence effect of the second optical component in the longitudinal direction onto the first axis is located in the projection area of ​​the channel of the notch structure onto the first axis.

15. The optical module according to claim 13 or 14, characterized in that, A portion of the surface of the channel of the notch structure forms a second reflective surface, which is disposed opposite to the second surface of the second optical component. When external light enters the second surface of the second optical component in a first direction and passes through the second optical component to enter the first optical component, at least a portion of the light is reflected at the second reflective surface and then emitted through the channel to the non-visible area outside the optical module.

16. The optical module according to claim 1, characterized in that, The second optical component is a converging lens.

17. The optical module according to claim 16, characterized in that, The converging lens includes an upper lens and a lower lens located above and below the second axis, respectively, wherein the focal length or principal focal length of the upper lens is shorter than the focal length or principal focal length of the lower lens.

18. A display screen comprising an optical module as described in any one of claims 1-17.

19. A display system comprising a display screen and a screen control system, wherein the display screen includes an optical module as described in claims 1-17, and the screen control system is used to control the information display operation of the display screen.

20. A traffic information system comprising a display system for displaying traffic information and a central control system for controlling the display of the traffic information, wherein the display system includes a display screen equipped with an optical module as described in claims 1-17.

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